jni.cpp revision 0:a61af66fc99e
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25# include "incls/_precompiled.incl" 26# include "incls/_jni.cpp.incl" 27 28static jint CurrentVersion = JNI_VERSION_1_6; 29 30 31// The DT_RETURN_MARK macros create a scoped object to fire the dtrace 32// '-return' probe regardless of the return path is taken out of the function. 33// Methods that have multiple return paths use this to avoid having to 34// instrument each return path. Methods that use CHECK or THROW must use this 35// since those macros can cause an immedate uninstrumented return. 36// 37// In order to get the return value, a reference to the variable containing 38// the return value must be passed to the contructor of the object, and 39// the return value must be set before return (since the mark object has 40// a reference to it). 41// 42// Example: 43// DT_RETURN_MARK_DECL(SomeFunc, int); 44// JNI_ENTRY(int, SomeFunc, ...) 45// int return_value = 0; 46// DT_RETURN_MARK(SomeFunc, int, (const int&)return_value); 47// foo(CHECK_0) 48// return_value = 5; 49// return return_value; 50// JNI_END 51#define DT_RETURN_MARK_DECL(name, type) \ 52 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \ 53 DTRACE_ONLY( \ 54 class DTraceReturnProbeMark_##name { \ 55 public: \ 56 const type& _ret_ref; \ 57 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \ 58 ~DTraceReturnProbeMark_##name() { \ 59 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \ 60 } \ 61 } \ 62 ) 63// Void functions are simpler since there's no return value 64#define DT_VOID_RETURN_MARK_DECL(name) \ 65 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \ 66 DTRACE_ONLY( \ 67 class DTraceReturnProbeMark_##name { \ 68 public: \ 69 ~DTraceReturnProbeMark_##name() { \ 70 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \ 71 } \ 72 } \ 73 ) 74 75 76// Place these macros in the function to mark the return. Non-void 77// functions need the type and address of the return value. 78#define DT_RETURN_MARK(name, type, ref) \ 79 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) ) 80#define DT_VOID_RETURN_MARK(name) \ 81 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark ) 82 83 84// Use these to select distinct code for floating-point vs. non-floating point 85// situations. Used from within common macros where we need slightly 86// different behavior for Float/Double 87#define FP_SELECT_Boolean(intcode, fpcode) intcode 88#define FP_SELECT_Byte(intcode, fpcode) intcode 89#define FP_SELECT_Char(intcode, fpcode) intcode 90#define FP_SELECT_Short(intcode, fpcode) intcode 91#define FP_SELECT_Object(intcode, fpcode) intcode 92#define FP_SELECT_Int(intcode, fpcode) intcode 93#define FP_SELECT_Long(intcode, fpcode) intcode 94#define FP_SELECT_Float(intcode, fpcode) fpcode 95#define FP_SELECT_Double(intcode, fpcode) fpcode 96#define FP_SELECT(TypeName, intcode, fpcode) \ 97 FP_SELECT_##TypeName(intcode, fpcode) 98 99#define COMMA , 100 101// Choose DT_RETURN_MARK macros based on the type: float/double -> void 102// (dtrace doesn't do FP yet) 103#define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \ 104 FP_SELECT(TypeName, \ 105 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) ) 106#define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \ 107 FP_SELECT(TypeName, \ 108 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) ) 109 110 111// out-of-line helpers for class jfieldIDWorkaround: 112 113bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) { 114 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) { 115 uintptr_t as_uint = (uintptr_t) id; 116 intptr_t offset = raw_instance_offset(id); 117 if (is_checked_jfieldID(id)) { 118 if (!klass_hash_ok(k, id)) { 119 return false; 120 } 121 } 122 return instanceKlass::cast(k)->contains_field_offset(offset); 123 } else { 124 JNIid* result = (JNIid*) id; 125#ifdef ASSERT 126 return result != NULL && result->is_static_field_id(); 127#else 128 return result != NULL; 129#endif 130 } 131} 132 133 134intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) { 135 if (offset <= small_offset_mask) { 136 klassOop field_klass = k; 137 klassOop super_klass = Klass::cast(field_klass)->super(); 138 while (instanceKlass::cast(super_klass)->contains_field_offset(offset)) { 139 field_klass = super_klass; // super contains the field also 140 super_klass = Klass::cast(field_klass)->super(); 141 } 142 debug_only(No_Safepoint_Verifier nosafepoint;) 143 uintptr_t klass_hash = field_klass->identity_hash(); 144 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place; 145 } else { 146#if 0 147 #ifndef PRODUCT 148 { 149 ResourceMark rm; 150 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name()); 151 } 152 #endif 153#endif 154 return 0; 155 } 156} 157 158bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) { 159 uintptr_t as_uint = (uintptr_t) id; 160 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask; 161 do { 162 debug_only(No_Safepoint_Verifier nosafepoint;) 163 // Could use a non-blocking query for identity_hash here... 164 if ((k->identity_hash() & klass_mask) == klass_hash) 165 return true; 166 k = Klass::cast(k)->super(); 167 } while (k != NULL); 168 return false; 169} 170 171void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) { 172 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" ); 173 uintptr_t as_uint = (uintptr_t) id; 174 intptr_t offset = raw_instance_offset(id); 175 if (VerifyJNIFields) { 176 if (is_checked_jfieldID(id)) { 177 guarantee(klass_hash_ok(k, id), 178 "Bug in native code: jfieldID class must match object"); 179 } else { 180#if 0 181 #ifndef PRODUCT 182 if (Verbose) { 183 ResourceMark rm; 184 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name()); 185 } 186 #endif 187#endif 188 } 189 } 190 guarantee(instanceKlass::cast(k)->contains_field_offset(offset), 191 "Bug in native code: jfieldID offset must address interior of object"); 192} 193 194// Pick a reasonable higher bound for local capacity requested 195// for EnsureLocalCapacity and PushLocalFrame. We don't want it too 196// high because a test (or very unusual application) may try to allocate 197// that many handles and run out of swap space. An implementation is 198// permitted to allocate more handles than the ensured capacity, so this 199// value is set high enough to prevent compatibility problems. 200const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K; 201 202 203// Wrapper to trace JNI functions 204 205#ifdef ASSERT 206 Histogram* JNIHistogram; 207 static volatile jint JNIHistogram_lock = 0; 208 209 class JNITraceWrapper : public StackObj { 210 public: 211 JNITraceWrapper(const char* format, ...) { 212 if (TraceJNICalls) { 213 va_list ap; 214 va_start(ap, format); 215 tty->print("JNI "); 216 tty->vprint_cr(format, ap); 217 va_end(ap); 218 } 219 } 220 }; 221 222 class JNIHistogramElement : public HistogramElement { 223 public: 224 JNIHistogramElement(const char* name); 225 }; 226 227 JNIHistogramElement::JNIHistogramElement(const char* elementName) { 228 _name = elementName; 229 uintx count = 0; 230 231 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) { 232 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) { 233 count +=1; 234 if ( (WarnOnStalledSpinLock > 0) 235 && (count % WarnOnStalledSpinLock == 0)) { 236 warning("JNIHistogram_lock seems to be stalled"); 237 } 238 } 239 } 240 241 242 if(JNIHistogram == NULL) 243 JNIHistogram = new Histogram("JNI Call Counts",100); 244 245 JNIHistogram->add_element(this); 246 Atomic::dec(&JNIHistogram_lock); 247 } 248 249 #define JNICountWrapper(arg) \ 250 static JNIHistogramElement* e = new JNIHistogramElement(arg); \ 251 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \ 252 if (e != NULL) e->increment_count() 253 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg) 254#else 255 #define JNIWrapper(arg) 256#endif 257 258 259// Implementation of JNI entries 260 261DT_RETURN_MARK_DECL(DefineClass, jclass); 262 263JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef, 264 const jbyte *buf, jsize bufLen)) 265 JNIWrapper("DefineClass"); 266 267 DTRACE_PROBE5(hotspot_jni, DefineClass__entry, 268 env, name, loaderRef, buf, bufLen); 269 jclass cls = NULL; 270 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls); 271 272 // Since exceptions can be thrown, class initialization can take place 273 // if name is NULL no check for class name in .class stream has to be made. 274 symbolHandle class_name; 275 if (name != NULL) { 276 const int str_len = (int)strlen(name); 277 if (str_len > symbolOopDesc::max_length()) { 278 // It's impossible to create this class; the name cannot fit 279 // into the constant pool. 280 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 281 } 282 class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL); 283 } 284 285 ResourceMark rm(THREAD); 286 ClassFileStream st((u1*) buf, bufLen, NULL); 287 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef)); 288 289 if (UsePerfData && !class_loader.is_null()) { 290 // check whether the current caller thread holds the lock or not. 291 // If not, increment the corresponding counter 292 if (ObjectSynchronizer:: 293 query_lock_ownership((JavaThread*)THREAD, class_loader) != 294 ObjectSynchronizer::owner_self) { 295 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc(); 296 } 297 } 298 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader, 299 Handle(), &st, CHECK_NULL); 300 301 cls = (jclass)JNIHandles::make_local( 302 env, Klass::cast(k)->java_mirror()); 303 return cls; 304JNI_END 305 306 307 308static bool first_time_FindClass = true; 309 310DT_RETURN_MARK_DECL(FindClass, jclass); 311 312JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name)) 313 JNIWrapper("FindClass"); 314 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name); 315 316 jclass result = NULL; 317 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result); 318 319 // Remember if we are the first invocation of jni_FindClass 320 bool first_time = first_time_FindClass; 321 first_time_FindClass = false; 322 323 // Sanity check the name: it cannot be null or larger than the maximum size 324 // name we can fit in the constant pool. 325 if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) { 326 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); 327 } 328 329 //%note jni_3 330 Handle loader; 331 Handle protection_domain; 332 // Find calling class 333 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0)); 334 if (k.not_null()) { 335 loader = Handle(THREAD, k->class_loader()); 336 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed 337 // in the correct class context. 338 if (loader.is_null() && 339 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) { 340 JavaValue result(T_OBJECT); 341 JavaCalls::call_static(&result, k, 342 vmSymbolHandles::getFromClass_name(), 343 vmSymbolHandles::void_class_signature(), 344 thread); 345 if (HAS_PENDING_EXCEPTION) { 346 Handle ex(thread, thread->pending_exception()); 347 CLEAR_PENDING_EXCEPTION; 348 THROW_HANDLE_0(ex); 349 } 350 oop mirror = (oop) result.get_jobject(); 351 loader = Handle(THREAD, 352 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader()); 353 protection_domain = Handle(THREAD, 354 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain()); 355 } 356 } else { 357 // We call ClassLoader.getSystemClassLoader to obtain the system class loader. 358 loader = Handle(THREAD, SystemDictionary::java_system_loader()); 359 } 360 361 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL); 362 result = find_class_from_class_loader(env, sym, true, loader, 363 protection_domain, true, thread); 364 365 // If we were the first invocation of jni_FindClass, we enable compilation again 366 // rather than just allowing invocation counter to overflow and decay. 367 // Controlled by flag DelayCompilationDuringStartup. 368 if (first_time && !CompileTheWorld) 369 CompilationPolicy::completed_vm_startup(); 370 371 return result; 372JNI_END 373 374DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID); 375 376JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method)) 377 JNIWrapper("FromReflectedMethod"); 378 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method); 379 jmethodID ret = NULL; 380 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret); 381 382 // method is a handle to a java.lang.reflect.Method object 383 oop reflected = JNIHandles::resolve_non_null(method); 384 oop mirror = NULL; 385 int slot = 0; 386 387 if (reflected->klass() == SystemDictionary::reflect_constructor_klass()) { 388 mirror = java_lang_reflect_Constructor::clazz(reflected); 389 slot = java_lang_reflect_Constructor::slot(reflected); 390 } else { 391 assert(reflected->klass() == SystemDictionary::reflect_method_klass(), "wrong type"); 392 mirror = java_lang_reflect_Method::clazz(reflected); 393 slot = java_lang_reflect_Method::slot(reflected); 394 } 395 klassOop k = java_lang_Class::as_klassOop(mirror); 396 397 KlassHandle k1(THREAD, k); 398 // Make sure class is initialized before handing id's out to methods 399 Klass::cast(k1())->initialize(CHECK_NULL); 400 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot); 401 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted 402 return ret; 403JNI_END 404 405DT_RETURN_MARK_DECL(FromReflectedField, jfieldID); 406 407JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field)) 408 JNIWrapper("FromReflectedField"); 409 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field); 410 jfieldID ret = NULL; 411 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret); 412 413 // field is a handle to a java.lang.reflect.Field object 414 oop reflected = JNIHandles::resolve_non_null(field); 415 oop mirror = java_lang_reflect_Field::clazz(reflected); 416 klassOop k = java_lang_Class::as_klassOop(mirror); 417 int slot = java_lang_reflect_Field::slot(reflected); 418 int modifiers = java_lang_reflect_Field::modifiers(reflected); 419 420 KlassHandle k1(THREAD, k); 421 // Make sure class is initialized before handing id's out to fields 422 Klass::cast(k1())->initialize(CHECK_NULL); 423 424 // First check if this is a static field 425 if (modifiers & JVM_ACC_STATIC) { 426 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot ); 427 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset); 428 assert(id != NULL, "corrupt Field object"); 429 debug_only(id->set_is_static_field_id();) 430 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop 431 ret = jfieldIDWorkaround::to_static_jfieldID(id); 432 return ret; 433 } 434 435 // The slot is the index of the field description in the field-array 436 // The jfieldID is the offset of the field within the object 437 // It may also have hash bits for k, if VerifyJNIFields is turned on. 438 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot ); 439 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object"); 440 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset); 441 return ret; 442JNI_END 443 444DT_RETURN_MARK_DECL(ToReflectedMethod, jobject); 445 446JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic)) 447 JNIWrapper("ToReflectedMethod"); 448 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic); 449 jobject ret = NULL; 450 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret); 451 452 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id)); 453 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match"); 454 oop reflection_method; 455 if (m->is_initializer()) { 456 reflection_method = Reflection::new_constructor(m, CHECK_NULL); 457 } else { 458 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL); 459 } 460 ret = JNIHandles::make_local(env, reflection_method); 461 return ret; 462JNI_END 463 464DT_RETURN_MARK_DECL(GetSuperclass, jclass); 465 466JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub)) 467 JNIWrapper("GetSuperclass"); 468 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub); 469 jclass obj = NULL; 470 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj); 471 472 oop mirror = JNIHandles::resolve_non_null(sub); 473 // primitive classes return NULL 474 if (java_lang_Class::is_primitive(mirror)) return NULL; 475 476 // Rules of Class.getSuperClass as implemented by KLass::java_super: 477 // arrays return Object 478 // interfaces return NULL 479 // proper classes return Klass::super() 480 klassOop k = java_lang_Class::as_klassOop(mirror); 481 if (Klass::cast(k)->is_interface()) return NULL; 482 483 // return mirror for superclass 484 klassOop super = Klass::cast(k)->java_super(); 485 // super2 is the value computed by the compiler's getSuperClass intrinsic: 486 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray() 487 ? SystemDictionary::object_klass() 488 : Klass::cast(k)->super() ) ); 489 assert(super == super2, 490 "java_super computation depends on interface, array, other super"); 491 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror()); 492 return obj; 493JNI_END 494 495JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super)) 496 JNIWrapper("IsSubclassOf"); 497 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super); 498 oop sub_mirror = JNIHandles::resolve_non_null(sub); 499 oop super_mirror = JNIHandles::resolve_non_null(super); 500 if (java_lang_Class::is_primitive(sub_mirror) || 501 java_lang_Class::is_primitive(super_mirror)) { 502 jboolean ret = (sub_mirror == super_mirror); 503 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret); 504 return ret; 505 } 506 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror); 507 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror); 508 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom"); 509 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ? 510 JNI_TRUE : JNI_FALSE; 511 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret); 512 return ret; 513JNI_END 514 515DT_RETURN_MARK_DECL(Throw, jint); 516 517JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj)) 518 JNIWrapper("Throw"); 519 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj); 520 jint ret = JNI_OK; 521 DT_RETURN_MARK(Throw, jint, (const jint&)ret); 522 523 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK); 524 ShouldNotReachHere(); 525JNI_END 526 527DT_RETURN_MARK_DECL(ThrowNew, jint); 528 529JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message)) 530 JNIWrapper("ThrowNew"); 531 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message); 532 jint ret = JNI_OK; 533 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret); 534 535 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 536 symbolHandle name = symbolHandle(THREAD, k->name()); 537 Handle class_loader (THREAD, k->class_loader()); 538 Handle protection_domain (THREAD, k->protection_domain()); 539 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK); 540 ShouldNotReachHere(); 541JNI_END 542 543 544// JNI functions only transform a pending async exception to a synchronous 545// exception in ExceptionOccurred and ExceptionCheck calls, since 546// delivering an async exception in other places won't change the native 547// code's control flow and would be harmful when native code further calls 548// JNI functions with a pending exception. Async exception is also checked 549// during the call, so ExceptionOccurred/ExceptionCheck won't return 550// false but deliver the async exception at the very end during 551// state transition. 552 553static void jni_check_async_exceptions(JavaThread *thread) { 554 assert(thread == Thread::current(), "must be itself"); 555 thread->check_and_handle_async_exceptions(); 556} 557 558JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env)) 559 JNIWrapper("ExceptionOccurred"); 560 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env); 561 jni_check_async_exceptions(thread); 562 oop exception = thread->pending_exception(); 563 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception); 564 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret); 565 return ret; 566JNI_END 567 568 569JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env)) 570 JNIWrapper("ExceptionDescribe"); 571 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env); 572 if (thread->has_pending_exception()) { 573 Handle ex(thread, thread->pending_exception()); 574 thread->clear_pending_exception(); 575 if (ex->is_a(SystemDictionary::threaddeath_klass())) { 576 // Don't print anything if we are being killed. 577 } else { 578 jio_fprintf(defaultStream::error_stream(), "Exception "); 579 if (thread != NULL && thread->threadObj() != NULL) { 580 ResourceMark rm(THREAD); 581 jio_fprintf(defaultStream::error_stream(), 582 "in thread \"%s\" ", thread->get_thread_name()); 583 } 584 if (ex->is_a(SystemDictionary::throwable_klass())) { 585 JavaValue result(T_VOID); 586 JavaCalls::call_virtual(&result, 587 ex, 588 KlassHandle(THREAD, 589 SystemDictionary::throwable_klass()), 590 vmSymbolHandles::printStackTrace_name(), 591 vmSymbolHandles::void_method_signature(), 592 THREAD); 593 // If an exception is thrown in the call it gets thrown away. Not much 594 // we can do with it. The native code that calls this, does not check 595 // for the exception - hence, it might still be in the thread when DestroyVM gets 596 // called, potentially causing a few asserts to trigger - since no pending exception 597 // is expected. 598 CLEAR_PENDING_EXCEPTION; 599 } else { 600 ResourceMark rm(THREAD); 601 jio_fprintf(defaultStream::error_stream(), 602 ". Uncaught exception of type %s.", 603 Klass::cast(ex->klass())->external_name()); 604 } 605 } 606 } 607 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return); 608JNI_END 609 610 611JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env)) 612 JNIWrapper("ExceptionClear"); 613 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env); 614 615 // The jni code might be using this API to clear java thrown exception. 616 // So just mark jvmti thread exception state as exception caught. 617 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state(); 618 if (state != NULL && state->is_exception_detected()) { 619 state->set_exception_caught(); 620 } 621 thread->clear_pending_exception(); 622 DTRACE_PROBE(hotspot_jni, ExceptionClear__return); 623JNI_END 624 625 626JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg)) 627 JNIWrapper("FatalError"); 628 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg); 629 tty->print_cr("FATAL ERROR in native method: %s", msg); 630 thread->print_stack(); 631 os::abort(false); // Prevent core dump, causes a jck failure. 632JNI_END 633 634 635JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity)) 636 JNIWrapper("PushLocalFrame"); 637 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity); 638 //%note jni_11 639 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) { 640 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR); 641 return JNI_ERR; 642 } 643 JNIHandleBlock* old_handles = thread->active_handles(); 644 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); 645 assert(new_handles != NULL, "should not be NULL"); 646 new_handles->set_pop_frame_link(old_handles); 647 thread->set_active_handles(new_handles); 648 jint ret = JNI_OK; 649 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret); 650 return ret; 651JNI_END 652 653 654JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result)) 655 JNIWrapper("PopLocalFrame"); 656 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result); 657 //%note jni_11 658 Handle result_handle(thread, JNIHandles::resolve(result)); 659 JNIHandleBlock* old_handles = thread->active_handles(); 660 JNIHandleBlock* new_handles = old_handles->pop_frame_link(); 661 if (new_handles != NULL) { 662 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL. 663 // This way code will still work if PopLocalFrame is called without a corresponding 664 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise 665 // the release_block call will release the blocks. 666 thread->set_active_handles(new_handles); 667 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below 668 JNIHandleBlock::release_block(old_handles, thread); // may block 669 result = JNIHandles::make_local(thread, result_handle()); 670 } 671 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result); 672 return result; 673JNI_END 674 675 676JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref)) 677 JNIWrapper("NewGlobalRef"); 678 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref); 679 Handle ref_handle(thread, JNIHandles::resolve(ref)); 680 jobject ret = JNIHandles::make_global(ref_handle); 681 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret); 682 return ret; 683JNI_END 684 685// Must be JNI_ENTRY (with HandleMark) 686JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref)) 687 JNIWrapper("DeleteGlobalRef"); 688 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref); 689 JNIHandles::destroy_global(ref); 690 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return); 691JNI_END 692 693JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj)) 694 JNIWrapper("DeleteLocalRef"); 695 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj); 696 JNIHandles::destroy_local(obj); 697 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return); 698JNI_END 699 700JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2)) 701 JNIWrapper("IsSameObject"); 702 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2); 703 oop a = JNIHandles::resolve(r1); 704 oop b = JNIHandles::resolve(r2); 705 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE; 706 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret); 707 return ret; 708JNI_END 709 710 711JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref)) 712 JNIWrapper("NewLocalRef"); 713 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref); 714 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref)); 715 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret); 716 return ret; 717JNI_END 718 719JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity)) 720 JNIWrapper("EnsureLocalCapacity"); 721 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity); 722 jint ret; 723 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) { 724 ret = JNI_OK; 725 } else { 726 ret = JNI_ERR; 727 } 728 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret); 729 return ret; 730JNI_END 731 732// Return the Handle Type 733JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj)) 734 JNIWrapper("GetObjectRefType"); 735 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj); 736 jobjectRefType ret; 737 if (JNIHandles::is_local_handle(thread, obj) || 738 JNIHandles::is_frame_handle(thread, obj)) 739 ret = JNILocalRefType; 740 else if (JNIHandles::is_global_handle(obj)) 741 ret = JNIGlobalRefType; 742 else if (JNIHandles::is_weak_global_handle(obj)) 743 ret = JNIWeakGlobalRefType; 744 else 745 ret = JNIInvalidRefType; 746 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret); 747 return ret; 748JNI_END 749 750 751class JNI_ArgumentPusher : public SignatureIterator { 752 protected: 753 JavaCallArguments* _arguments; 754 755 virtual void get_bool () = 0; 756 virtual void get_char () = 0; 757 virtual void get_short () = 0; 758 virtual void get_byte () = 0; 759 virtual void get_int () = 0; 760 virtual void get_long () = 0; 761 virtual void get_float () = 0; 762 virtual void get_double () = 0; 763 virtual void get_object () = 0; 764 765 JNI_ArgumentPusher(Thread *thread, symbolOop signature) 766 : SignatureIterator(thread, signature) { 767 this->_return_type = T_ILLEGAL; 768 _arguments = NULL; 769 } 770 771 public: 772 virtual void iterate( uint64_t fingerprint ) = 0; 773 774 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; } 775 776 inline void do_bool() { if (!is_return_type()) get_bool(); } 777 inline void do_char() { if (!is_return_type()) get_char(); } 778 inline void do_short() { if (!is_return_type()) get_short(); } 779 inline void do_byte() { if (!is_return_type()) get_byte(); } 780 inline void do_int() { if (!is_return_type()) get_int(); } 781 inline void do_long() { if (!is_return_type()) get_long(); } 782 inline void do_float() { if (!is_return_type()) get_float(); } 783 inline void do_double() { if (!is_return_type()) get_double(); } 784 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); } 785 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array 786 inline void do_void() { } 787 788 JavaCallArguments* arguments() { return _arguments; } 789 void push_receiver(Handle h) { _arguments->push_oop(h); } 790}; 791 792 793class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher { 794 protected: 795 va_list _ap; 796 797 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg 798 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg 799 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg 800 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg 801 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); } 802 803 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests 804 805 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); } 806 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg 807 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); } 808 inline void get_object() { jobject l = va_arg(_ap, jobject); 809 _arguments->push_oop(Handle((oop *)l, false)); } 810 811 inline void set_ap(va_list rap) { 812#ifdef va_copy 813 va_copy(_ap, rap); 814#elif defined (__va_copy) 815 __va_copy(_ap, rap); 816#else 817 _ap = rap; 818#endif 819 } 820 821 public: 822 JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap) 823 : JNI_ArgumentPusher(thread, signature) { 824 set_ap(rap); 825 } 826 JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap) 827 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) { 828 set_ap(rap); 829 } 830 831 // Optimized path if we have the bitvector form of signature 832 void iterate( uint64_t fingerprint ) { 833 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments 834 else { 835 _return_type = (BasicType)((fingerprint >> static_feature_size) & 836 result_feature_mask); 837 838 assert(fingerprint, "Fingerprint should not be 0"); 839 fingerprint = fingerprint >> (static_feature_size + result_feature_size); 840 while ( 1 ) { 841 switch ( fingerprint & parameter_feature_mask ) { 842 case bool_parm: 843 case char_parm: 844 case short_parm: 845 case byte_parm: 846 case int_parm: 847 get_int(); 848 break; 849 case obj_parm: 850 get_object(); 851 break; 852 case long_parm: 853 get_long(); 854 break; 855 case float_parm: 856 get_float(); 857 break; 858 case double_parm: 859 get_double(); 860 break; 861 case done_parm: 862 return; 863 break; 864 default: 865 ShouldNotReachHere(); 866 break; 867 } 868 fingerprint >>= parameter_feature_size; 869 } 870 } 871 } 872}; 873 874 875class JNI_ArgumentPusherArray : public JNI_ArgumentPusher { 876 protected: 877 const jvalue *_ap; 878 879 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); } 880 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); } 881 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); } 882 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); } 883 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); } 884 885 inline void get_long() { _arguments->push_long((_ap++)->j); } 886 inline void get_float() { _arguments->push_float((_ap++)->f); } 887 inline void get_double() { _arguments->push_double((_ap++)->d);} 888 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); } 889 890 inline void set_ap(const jvalue *rap) { _ap = rap; } 891 892 public: 893 JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap) 894 : JNI_ArgumentPusher(thread, signature) { 895 set_ap(rap); 896 } 897 JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap) 898 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) { 899 set_ap(rap); 900 } 901 902 // Optimized path if we have the bitvector form of signature 903 void iterate( uint64_t fingerprint ) { 904 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments 905 else { 906 _return_type = (BasicType)((fingerprint >> static_feature_size) & 907 result_feature_mask); 908 assert(fingerprint, "Fingerprint should not be 0"); 909 fingerprint = fingerprint >> (static_feature_size + result_feature_size); 910 while ( 1 ) { 911 switch ( fingerprint & parameter_feature_mask ) { 912 case bool_parm: 913 get_bool(); 914 break; 915 case char_parm: 916 get_char(); 917 break; 918 case short_parm: 919 get_short(); 920 break; 921 case byte_parm: 922 get_byte(); 923 break; 924 case int_parm: 925 get_int(); 926 break; 927 case obj_parm: 928 get_object(); 929 break; 930 case long_parm: 931 get_long(); 932 break; 933 case float_parm: 934 get_float(); 935 break; 936 case double_parm: 937 get_double(); 938 break; 939 case done_parm: 940 return; 941 break; 942 default: 943 ShouldNotReachHere(); 944 break; 945 } 946 fingerprint >>= parameter_feature_size; 947 } 948 } 949 } 950}; 951 952 953enum JNICallType { 954 JNI_STATIC, 955 JNI_VIRTUAL, 956 JNI_NONVIRTUAL 957}; 958 959static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) { 960 assert(!method.is_null() , "method should not be null"); 961 962 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc) 963 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass()); 964 KlassHandle spec_klass (THREAD, method->method_holder()); 965 symbolHandle name (THREAD, method->name()); 966 symbolHandle signature (THREAD, method->signature()); 967 CallInfo info; 968 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle())); 969 return info.selected_method(); 970} 971 972static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) { 973 assert(!method.is_null() , "method should not be null"); 974 975 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc) 976 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass()); 977 KlassHandle spec_klass (THREAD, method->method_holder()); 978 symbolHandle name (THREAD, method->name()); 979 symbolHandle signature (THREAD, method->signature()); 980 CallInfo info; 981 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle())); 982 return info.selected_method(); 983} 984 985 986 987static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) { 988 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id)); 989 990 // Create object to hold arguments for the JavaCall, and associate it with 991 // the jni parser 992 ResourceMark rm(THREAD); 993 int number_of_parameters = method->size_of_parameters(); 994 JavaCallArguments java_args(number_of_parameters); 995 args->set_java_argument_object(&java_args); 996 997 assert(method->is_static(), "method should be static"); 998 999 // Fill out JavaCallArguments object 1000 args->iterate( Fingerprinter(THREAD, method).fingerprint() ); 1001 // Initialize result type 1002 result->set_type(args->get_ret_type()); 1003 1004 // Invoke the method. Result is returned as oop. 1005 JavaCalls::call(result, method, &java_args, CHECK); 1006 1007 // Convert result 1008 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) { 1009 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject())); 1010 } 1011} 1012 1013 1014static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) { 1015 oop recv = JNIHandles::resolve(receiver); 1016 if (recv == NULL) { 1017 THROW(vmSymbols::java_lang_NullPointerException()); 1018 } 1019 Handle h_recv(THREAD, recv); 1020 1021 int number_of_parameters; 1022 methodOop selected_method; 1023 { 1024 methodOop m = JNIHandles::resolve_jmethod_id(method_id); 1025 number_of_parameters = m->size_of_parameters(); 1026 klassOop holder = m->method_holder(); 1027 if (!(Klass::cast(holder))->is_interface()) { 1028 // non-interface call -- for that little speed boost, don't handlize 1029 debug_only(No_Safepoint_Verifier nosafepoint;) 1030 if (call_type == JNI_VIRTUAL) { 1031 // jni_GetMethodID makes sure class is linked and initialized 1032 // so m should have a valid vtable index. 1033 int vtbl_index = m->vtable_index(); 1034 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) { 1035 klassOop k = h_recv->klass(); 1036 // k might be an arrayKlassOop but all vtables start at 1037 // the same place. The cast is to avoid virtual call and assertion. 1038 instanceKlass *ik = (instanceKlass*)k->klass_part(); 1039 selected_method = ik->method_at_vtable(vtbl_index); 1040 } else { 1041 // final method 1042 selected_method = m; 1043 } 1044 } else { 1045 // JNI_NONVIRTUAL call 1046 selected_method = m; 1047 } 1048 } else { 1049 // interface call 1050 KlassHandle h_holder(THREAD, holder); 1051 1052 int itbl_index = m->cached_itable_index(); 1053 if (itbl_index == -1) { 1054 itbl_index = klassItable::compute_itable_index(m); 1055 m->set_cached_itable_index(itbl_index); 1056 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again 1057 } 1058 klassOop k = h_recv->klass(); 1059 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK); 1060 } 1061 } 1062 1063 methodHandle method(THREAD, selected_method); 1064 1065 // Create object to hold arguments for the JavaCall, and associate it with 1066 // the jni parser 1067 ResourceMark rm(THREAD); 1068 JavaCallArguments java_args(number_of_parameters); 1069 args->set_java_argument_object(&java_args); 1070 1071 // handle arguments 1072 assert(!method->is_static(), "method should not be static"); 1073 args->push_receiver(h_recv); // Push jobject handle 1074 1075 // Fill out JavaCallArguments object 1076 args->iterate( Fingerprinter(THREAD, method).fingerprint() ); 1077 // Initialize result type 1078 result->set_type(args->get_ret_type()); 1079 1080 // Invoke the method. Result is returned as oop. 1081 JavaCalls::call(result, method, &java_args, CHECK); 1082 1083 // Convert result 1084 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) { 1085 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject())); 1086 } 1087} 1088 1089 1090static instanceOop alloc_object(jclass clazz, TRAPS) { 1091 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 1092 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL); 1093 instanceKlass::cast(k())->initialize(CHECK_NULL); 1094 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD); 1095 return ih; 1096} 1097 1098DT_RETURN_MARK_DECL(AllocObject, jobject); 1099 1100JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz)) 1101 JNIWrapper("AllocObject"); 1102 1103 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz); 1104 jobject ret = NULL; 1105 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret); 1106 1107 instanceOop i = alloc_object(clazz, CHECK_NULL); 1108 ret = JNIHandles::make_local(env, i); 1109 return ret; 1110JNI_END 1111 1112DT_RETURN_MARK_DECL(NewObjectA, jobject); 1113 1114JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args)) 1115 JNIWrapper("NewObjectA"); 1116 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID); 1117 jobject obj = NULL; 1118 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj); 1119 1120 instanceOop i = alloc_object(clazz, CHECK_NULL); 1121 obj = JNIHandles::make_local(env, i); 1122 JavaValue jvalue(T_VOID); 1123 JNI_ArgumentPusherArray ap(THREAD, methodID, args); 1124 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); 1125 return obj; 1126JNI_END 1127 1128DT_RETURN_MARK_DECL(NewObjectV, jobject); 1129 1130JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args)) 1131 JNIWrapper("NewObjectV"); 1132 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID); 1133 jobject obj = NULL; 1134 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj); 1135 1136 instanceOop i = alloc_object(clazz, CHECK_NULL); 1137 obj = JNIHandles::make_local(env, i); 1138 JavaValue jvalue(T_VOID); 1139 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1140 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); 1141 return obj; 1142JNI_END 1143 1144DT_RETURN_MARK_DECL(NewObject, jobject); 1145 1146JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...)) 1147 JNIWrapper("NewObject"); 1148 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID); 1149 jobject obj = NULL; 1150 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj); 1151 1152 instanceOop i = alloc_object(clazz, CHECK_NULL); 1153 obj = JNIHandles::make_local(env, i); 1154 va_list args; 1155 va_start(args, methodID); 1156 JavaValue jvalue(T_VOID); 1157 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1158 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); 1159 va_end(args); 1160 return obj; 1161JNI_END 1162 1163 1164JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj)) 1165 JNIWrapper("GetObjectClass"); 1166 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj); 1167 klassOop k = JNIHandles::resolve_non_null(obj)->klass(); 1168 jclass ret = 1169 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror()); 1170 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret); 1171 return ret; 1172JNI_END 1173 1174JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz)) 1175 JNIWrapper("IsInstanceOf"); 1176 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz); 1177 jboolean ret = JNI_TRUE; 1178 if (obj != NULL) { 1179 ret = JNI_FALSE; 1180 klassOop k = java_lang_Class::as_klassOop( 1181 JNIHandles::resolve_non_null(clazz)); 1182 if (k != NULL) { 1183 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE; 1184 } 1185 } 1186 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret); 1187 return ret; 1188JNI_END 1189 1190 1191static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str, 1192 const char *sig, bool is_static, TRAPS) { 1193 // %%%% This code should probably just call into a method in the LinkResolver 1194 // 1195 // The class should have been loaded (we have an instance of the class 1196 // passed in) so the method and signature should already be in the symbol 1197 // table. If they're not there, the method doesn't exist. 1198 symbolHandle signature = 1199 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); 1200 symbolHandle name; 1201 if (name_str == NULL) { 1202 name = vmSymbolHandles::object_initializer_name(); 1203 } else { 1204 name = symbolHandle(THREAD, 1205 SymbolTable::probe(name_str, (int)strlen(name_str))); 1206 } 1207 if (name.is_null() || signature.is_null()) { 1208 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); 1209 } 1210 1211 // Throw a NoSuchMethodError exception if we have an instance of a 1212 // primitive java.lang.Class 1213 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) { 1214 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); 1215 } 1216 1217 KlassHandle klass(THREAD, 1218 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 1219 1220 // Make sure class is linked and initialized before handing id's out to 1221 // methodOops. 1222 Klass::cast(klass())->initialize(CHECK_NULL); 1223 1224 methodOop m; 1225 if (name() == vmSymbols::object_initializer_name() || 1226 name() == vmSymbols::class_initializer_name()) { 1227 // Never search superclasses for constructors 1228 if (klass->oop_is_instance()) { 1229 m = instanceKlass::cast(klass())->find_method(name(), signature()); 1230 } else { 1231 m = NULL; 1232 } 1233 } else { 1234 m = klass->lookup_method(name(), signature()); 1235 // Look up interfaces 1236 if (m == NULL && klass->oop_is_instance()) { 1237 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(), 1238 signature()); 1239 } 1240 } 1241 if (m == NULL || (m->is_static() != is_static)) { 1242 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); 1243 } 1244 return m->jmethod_id(); 1245} 1246 1247 1248JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz, 1249 const char *name, const char *sig)) 1250 JNIWrapper("GetMethodID"); 1251 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig); 1252 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread); 1253 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret); 1254 return ret; 1255JNI_END 1256 1257 1258JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz, 1259 const char *name, const char *sig)) 1260 JNIWrapper("GetStaticMethodID"); 1261 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig); 1262 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread); 1263 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret); 1264 return ret; 1265JNI_END 1266 1267 1268 1269// 1270// Calling Methods 1271// 1272 1273 1274#define DEFINE_CALLMETHOD(ResultType, Result, Tag) \ 1275\ 1276 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\ 1277 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\ 1278 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\ 1279\ 1280JNI_ENTRY(ResultType, \ 1281 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \ 1282 JNIWrapper("Call" XSTR(Result) "Method"); \ 1283\ 1284 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\ 1285 ResultType ret = 0;\ 1286 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \ 1287 (const ResultType&)ret);\ 1288\ 1289 va_list args; \ 1290 va_start(args, methodID); \ 1291 JavaValue jvalue(Tag); \ 1292 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1293 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ 1294 va_end(args); \ 1295 ret = jvalue.get_##ResultType(); \ 1296 return ret;\ 1297JNI_END \ 1298\ 1299\ 1300JNI_ENTRY(ResultType, \ 1301 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \ 1302 JNIWrapper("Call" XSTR(Result) "MethodV"); \ 1303\ 1304 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\ 1305 ResultType ret = 0;\ 1306 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \ 1307 (const ResultType&)ret);\ 1308\ 1309 JavaValue jvalue(Tag); \ 1310 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1311 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ 1312 ret = jvalue.get_##ResultType(); \ 1313 return ret;\ 1314JNI_END \ 1315\ 1316\ 1317JNI_ENTRY(ResultType, \ 1318 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \ 1319 JNIWrapper("Call" XSTR(Result) "MethodA"); \ 1320 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\ 1321 ResultType ret = 0;\ 1322 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \ 1323 (const ResultType&)ret);\ 1324\ 1325 JavaValue jvalue(Tag); \ 1326 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ 1327 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ 1328 ret = jvalue.get_##ResultType(); \ 1329 return ret;\ 1330JNI_END 1331 1332// the runtime type of subword integral basic types is integer 1333DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN) 1334DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE) 1335DEFINE_CALLMETHOD(jchar, Char, T_CHAR) 1336DEFINE_CALLMETHOD(jshort, Short, T_SHORT) 1337 1338DEFINE_CALLMETHOD(jobject, Object, T_OBJECT) 1339DEFINE_CALLMETHOD(jint, Int, T_INT) 1340DEFINE_CALLMETHOD(jlong, Long, T_LONG) 1341DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT) 1342DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE) 1343 1344DT_VOID_RETURN_MARK_DECL(CallVoidMethod); 1345DT_VOID_RETURN_MARK_DECL(CallVoidMethodV); 1346DT_VOID_RETURN_MARK_DECL(CallVoidMethodA); 1347 1348JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...)) 1349 JNIWrapper("CallVoidMethod"); 1350 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID); 1351 DT_VOID_RETURN_MARK(CallVoidMethod); 1352 1353 va_list args; 1354 va_start(args, methodID); 1355 JavaValue jvalue(T_VOID); 1356 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1357 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); 1358 va_end(args); 1359JNI_END 1360 1361 1362JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) 1363 JNIWrapper("CallVoidMethodV"); 1364 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID); 1365 DT_VOID_RETURN_MARK(CallVoidMethodV); 1366 1367 JavaValue jvalue(T_VOID); 1368 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1369 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); 1370JNI_END 1371 1372 1373JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) 1374 JNIWrapper("CallVoidMethodA"); 1375 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID); 1376 DT_VOID_RETURN_MARK(CallVoidMethodA); 1377 1378 JavaValue jvalue(T_VOID); 1379 JNI_ArgumentPusherArray ap(THREAD, methodID, args); 1380 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); 1381JNI_END 1382 1383 1384#define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \ 1385\ 1386 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\ 1387 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\ 1388 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\ 1389\ 1390JNI_ENTRY(ResultType, \ 1391 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \ 1392 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \ 1393\ 1394 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\ 1395 ResultType ret;\ 1396 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \ 1397 (const ResultType&)ret);\ 1398\ 1399 va_list args; \ 1400 va_start(args, methodID); \ 1401 JavaValue jvalue(Tag); \ 1402 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1403 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ 1404 va_end(args); \ 1405 ret = jvalue.get_##ResultType(); \ 1406 return ret;\ 1407JNI_END \ 1408\ 1409JNI_ENTRY(ResultType, \ 1410 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \ 1411 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \ 1412 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\ 1413 ResultType ret;\ 1414 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \ 1415 (const ResultType&)ret);\ 1416\ 1417 JavaValue jvalue(Tag); \ 1418 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1419 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ 1420 ret = jvalue.get_##ResultType(); \ 1421 return ret;\ 1422JNI_END \ 1423\ 1424JNI_ENTRY(ResultType, \ 1425 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \ 1426 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \ 1427 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\ 1428 ResultType ret;\ 1429 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \ 1430 (const ResultType&)ret);\ 1431\ 1432 JavaValue jvalue(Tag); \ 1433 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ 1434 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ 1435 ret = jvalue.get_##ResultType(); \ 1436 return ret;\ 1437JNI_END 1438 1439// the runtime type of subword integral basic types is integer 1440DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN) 1441DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE) 1442DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR) 1443DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT) 1444 1445DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT) 1446DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT) 1447DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG) 1448DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT) 1449DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE) 1450 1451 1452DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod); 1453DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV); 1454DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA); 1455 1456JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) 1457 JNIWrapper("CallNonvirtualVoidMethod"); 1458 1459 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry, 1460 env, obj, cls, methodID); 1461 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod); 1462 1463 va_list args; 1464 va_start(args, methodID); 1465 JavaValue jvalue(T_VOID); 1466 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1467 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); 1468 va_end(args); 1469JNI_END 1470 1471 1472JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) 1473 JNIWrapper("CallNonvirtualVoidMethodV"); 1474 1475 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry, 1476 env, obj, cls, methodID); 1477 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV); 1478 1479 JavaValue jvalue(T_VOID); 1480 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1481 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); 1482JNI_END 1483 1484 1485JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) 1486 JNIWrapper("CallNonvirtualVoidMethodA"); 1487 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry, 1488 env, obj, cls, methodID); 1489 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA); 1490 JavaValue jvalue(T_VOID); 1491 JNI_ArgumentPusherArray ap(THREAD, methodID, args); 1492 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); 1493JNI_END 1494 1495 1496#define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \ 1497\ 1498 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\ 1499 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\ 1500 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\ 1501\ 1502JNI_ENTRY(ResultType, \ 1503 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \ 1504 JNIWrapper("CallStatic" XSTR(Result) "Method"); \ 1505\ 1506 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\ 1507 ResultType ret = 0;\ 1508 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \ 1509 (const ResultType&)ret);\ 1510\ 1511 va_list args; \ 1512 va_start(args, methodID); \ 1513 JavaValue jvalue(Tag); \ 1514 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1515 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ 1516 va_end(args); \ 1517 ret = jvalue.get_##ResultType(); \ 1518 return ret;\ 1519JNI_END \ 1520\ 1521JNI_ENTRY(ResultType, \ 1522 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \ 1523 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \ 1524 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\ 1525 ResultType ret = 0;\ 1526 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \ 1527 (const ResultType&)ret);\ 1528\ 1529 JavaValue jvalue(Tag); \ 1530 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ 1531 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ 1532 ret = jvalue.get_##ResultType(); \ 1533 return ret;\ 1534JNI_END \ 1535\ 1536JNI_ENTRY(ResultType, \ 1537 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \ 1538 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \ 1539 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\ 1540 ResultType ret = 0;\ 1541 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \ 1542 (const ResultType&)ret);\ 1543\ 1544 JavaValue jvalue(Tag); \ 1545 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ 1546 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ 1547 ret = jvalue.get_##ResultType(); \ 1548 return ret;\ 1549JNI_END 1550 1551// the runtime type of subword integral basic types is integer 1552DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN) 1553DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE) 1554DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR) 1555DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT) 1556 1557DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT) 1558DEFINE_CALLSTATICMETHOD(jint, Int, T_INT) 1559DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG) 1560DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT) 1561DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE) 1562 1563 1564DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod); 1565DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV); 1566DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA); 1567 1568JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...)) 1569 JNIWrapper("CallStaticVoidMethod"); 1570 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID); 1571 DT_VOID_RETURN_MARK(CallStaticVoidMethod); 1572 1573 va_list args; 1574 va_start(args, methodID); 1575 JavaValue jvalue(T_VOID); 1576 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1577 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); 1578 va_end(args); 1579JNI_END 1580 1581 1582JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) 1583 JNIWrapper("CallStaticVoidMethodV"); 1584 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID); 1585 DT_VOID_RETURN_MARK(CallStaticVoidMethodV); 1586 1587 JavaValue jvalue(T_VOID); 1588 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); 1589 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); 1590JNI_END 1591 1592 1593JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) 1594 JNIWrapper("CallStaticVoidMethodA"); 1595 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID); 1596 DT_VOID_RETURN_MARK(CallStaticVoidMethodA); 1597 1598 JavaValue jvalue(T_VOID); 1599 JNI_ArgumentPusherArray ap(THREAD, methodID, args); 1600 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); 1601JNI_END 1602 1603 1604// 1605// Accessing Fields 1606// 1607 1608 1609DT_RETURN_MARK_DECL(GetFieldID, jfieldID); 1610 1611JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz, 1612 const char *name, const char *sig)) 1613 JNIWrapper("GetFieldID"); 1614 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig); 1615 jfieldID ret = 0; 1616 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret); 1617 1618 // The class should have been loaded (we have an instance of the class 1619 // passed in) so the field and signature should already be in the symbol 1620 // table. If they're not there, the field doesn't exist. 1621 symbolHandle fieldname = 1622 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name))); 1623 symbolHandle signame = 1624 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); 1625 if (fieldname.is_null() || signame.is_null()) { 1626 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); 1627 } 1628 KlassHandle k(THREAD, 1629 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 1630 // Make sure class is initialized before handing id's out to fields 1631 Klass::cast(k())->initialize(CHECK_NULL); 1632 1633 fieldDescriptor fd; 1634 if (!Klass::cast(k())->oop_is_instance() || 1635 !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) { 1636 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); 1637 } 1638 1639 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop 1640 // It may also have hash bits for k, if VerifyJNIFields is turned on. 1641 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset()); 1642 return ret; 1643JNI_END 1644 1645 1646JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID)) 1647 JNIWrapper("GetObjectField"); 1648 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID); 1649 oop o = JNIHandles::resolve_non_null(obj); 1650 klassOop k = o->klass(); 1651 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); 1652 // Keep JVMTI addition small and only check enabled flag here. 1653 // jni_GetField_probe() assumes that is okay to create handles. 1654 if (JvmtiExport::should_post_field_access()) { 1655 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); 1656 } 1657 jobject ret = JNIHandles::make_local(env, o->obj_field(offset)); 1658 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret); 1659 return ret; 1660JNI_END 1661 1662 1663#define DEFINE_GETFIELD(Return,Fieldname,Result) \ 1664\ 1665 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\ 1666\ 1667JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \ 1668 JNIWrapper("Get" XSTR(Result) "Field"); \ 1669\ 1670 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\ 1671 Return ret = 0;\ 1672 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\ 1673\ 1674 oop o = JNIHandles::resolve_non_null(obj); \ 1675 klassOop k = o->klass(); \ 1676 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \ 1677 /* Keep JVMTI addition small and only check enabled flag here. */ \ 1678 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \ 1679 /* and creates a ResetNoHandleMark. */ \ 1680 if (JvmtiExport::should_post_field_access()) { \ 1681 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \ 1682 } \ 1683 ret = o->Fieldname##_field(offset); \ 1684 return ret; \ 1685JNI_END 1686 1687DEFINE_GETFIELD(jboolean, bool, Boolean) 1688DEFINE_GETFIELD(jbyte, byte, Byte) 1689DEFINE_GETFIELD(jchar, char, Char) 1690DEFINE_GETFIELD(jshort, short, Short) 1691DEFINE_GETFIELD(jint, int, Int) 1692DEFINE_GETFIELD(jlong, long, Long) 1693DEFINE_GETFIELD(jfloat, float, Float) 1694DEFINE_GETFIELD(jdouble, double, Double) 1695 1696address jni_GetBooleanField_addr() { 1697 return (address)jni_GetBooleanField; 1698} 1699address jni_GetByteField_addr() { 1700 return (address)jni_GetByteField; 1701} 1702address jni_GetCharField_addr() { 1703 return (address)jni_GetCharField; 1704} 1705address jni_GetShortField_addr() { 1706 return (address)jni_GetShortField; 1707} 1708address jni_GetIntField_addr() { 1709 return (address)jni_GetIntField; 1710} 1711address jni_GetLongField_addr() { 1712 return (address)jni_GetLongField; 1713} 1714address jni_GetFloatField_addr() { 1715 return (address)jni_GetFloatField; 1716} 1717address jni_GetDoubleField_addr() { 1718 return (address)jni_GetDoubleField; 1719} 1720 1721JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value)) 1722 JNIWrapper("SetObjectField"); 1723 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value); 1724 oop o = JNIHandles::resolve_non_null(obj); 1725 klassOop k = o->klass(); 1726 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); 1727 // Keep JVMTI addition small and only check enabled flag here. 1728 // jni_SetField_probe_nh() assumes that is not okay to create handles 1729 // and creates a ResetNoHandleMark. 1730 if (JvmtiExport::should_post_field_modification()) { 1731 jvalue field_value; 1732 field_value.l = value; 1733 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value); 1734 } 1735 o->obj_field_put(offset, JNIHandles::resolve(value)); 1736 DTRACE_PROBE(hotspot_jni, SetObjectField__return); 1737JNI_END 1738 1739#define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \ 1740\ 1741JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \ 1742 JNIWrapper("Set" XSTR(Result) "Field"); \ 1743\ 1744 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \ 1745 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \ 1746 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \ 1747 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \ 1748\ 1749 oop o = JNIHandles::resolve_non_null(obj); \ 1750 klassOop k = o->klass(); \ 1751 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \ 1752 /* Keep JVMTI addition small and only check enabled flag here. */ \ 1753 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \ 1754 /* and creates a ResetNoHandleMark. */ \ 1755 if (JvmtiExport::should_post_field_modification()) { \ 1756 jvalue field_value; \ 1757 field_value.unionType = value; \ 1758 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \ 1759 } \ 1760 o->Fieldname##_field_put(offset, value); \ 1761 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\ 1762JNI_END 1763 1764DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z) 1765DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b) 1766DEFINE_SETFIELD(jchar, char, Char, 'C', c) 1767DEFINE_SETFIELD(jshort, short, Short, 'S', s) 1768DEFINE_SETFIELD(jint, int, Int, 'I', i) 1769DEFINE_SETFIELD(jlong, long, Long, 'J', j) 1770DEFINE_SETFIELD(jfloat, float, Float, 'F', f) 1771DEFINE_SETFIELD(jdouble, double, Double, 'D', d) 1772 1773DT_RETURN_MARK_DECL(ToReflectedField, jobject); 1774 1775JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic)) 1776 JNIWrapper("ToReflectedField"); 1777 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry, 1778 env, cls, fieldID, isStatic); 1779 jobject ret = NULL; 1780 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret); 1781 1782 fieldDescriptor fd; 1783 bool found = false; 1784 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls)); 1785 1786 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID"); 1787 1788 if (isStatic) { 1789 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop. 1790 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); 1791 assert(id->is_static_field_id(), "invalid static field id"); 1792 found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd); 1793 } else { 1794 // Non-static field. The fieldID is really the offset of the field within the instanceOop. 1795 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); 1796 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd); 1797 } 1798 assert(found, "bad fieldID passed into jni_ToReflectedField"); 1799 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL); 1800 ret = JNIHandles::make_local(env, reflected); 1801 return ret; 1802JNI_END 1803 1804 1805// 1806// Accessing Static Fields 1807// 1808DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID); 1809 1810JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz, 1811 const char *name, const char *sig)) 1812 JNIWrapper("GetStaticFieldID"); 1813 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig); 1814 jfieldID ret = NULL; 1815 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret); 1816 1817 // The class should have been loaded (we have an instance of the class 1818 // passed in) so the field and signature should already be in the symbol 1819 // table. If they're not there, the field doesn't exist. 1820 symbolHandle fieldname = 1821 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name))); 1822 symbolHandle signame = 1823 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); 1824 if (fieldname.is_null() || signame.is_null()) { 1825 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); 1826 } 1827 KlassHandle k(THREAD, 1828 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 1829 // Make sure class is initialized before handing id's out to static fields 1830 Klass::cast(k())->initialize(CHECK_NULL); 1831 1832 fieldDescriptor fd; 1833 if (!Klass::cast(k())->oop_is_instance() || 1834 !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) { 1835 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); 1836 } 1837 1838 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop 1839 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset()); 1840 debug_only(id->set_is_static_field_id();) 1841 1842 debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();) 1843 debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);) 1844 assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset"); 1845 1846 ret = jfieldIDWorkaround::to_static_jfieldID(id); 1847 return ret; 1848JNI_END 1849 1850 1851JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID)) 1852 JNIWrapper("GetStaticObjectField"); 1853 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID); 1854#ifndef JNICHECK_KERNEL 1855 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);) 1856#endif // JNICHECK_KERNEL 1857 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); 1858 assert(id->is_static_field_id(), "invalid static field id"); 1859 // Keep JVMTI addition small and only check enabled flag here. 1860 // jni_GetField_probe() assumes that is okay to create handles. 1861 if (JvmtiExport::should_post_field_access()) { 1862 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); 1863 } 1864 jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset())); 1865 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret); 1866 return ret; 1867JNI_END 1868 1869#define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \ 1870\ 1871 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\ 1872\ 1873JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \ 1874 JNIWrapper("GetStatic" XSTR(Result) "Field"); \ 1875 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\ 1876 Return ret = 0;\ 1877 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \ 1878 (const Return&)ret);\ 1879 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \ 1880 assert(id->is_static_field_id(), "invalid static field id"); \ 1881 /* Keep JVMTI addition small and only check enabled flag here. */ \ 1882 /* jni_GetField_probe() assumes that is okay to create handles. */ \ 1883 if (JvmtiExport::should_post_field_access()) { \ 1884 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \ 1885 } \ 1886 ret = id->holder()-> Fieldname##_field (id->offset()); \ 1887 return ret;\ 1888JNI_END 1889 1890DEFINE_GETSTATICFIELD(jboolean, bool, Boolean) 1891DEFINE_GETSTATICFIELD(jbyte, byte, Byte) 1892DEFINE_GETSTATICFIELD(jchar, char, Char) 1893DEFINE_GETSTATICFIELD(jshort, short, Short) 1894DEFINE_GETSTATICFIELD(jint, int, Int) 1895DEFINE_GETSTATICFIELD(jlong, long, Long) 1896DEFINE_GETSTATICFIELD(jfloat, float, Float) 1897DEFINE_GETSTATICFIELD(jdouble, double, Double) 1898 1899 1900JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value)) 1901 JNIWrapper("SetStaticObjectField"); 1902 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value); 1903 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); 1904 assert(id->is_static_field_id(), "invalid static field id"); 1905 // Keep JVMTI addition small and only check enabled flag here. 1906 // jni_SetField_probe() assumes that is okay to create handles. 1907 if (JvmtiExport::should_post_field_modification()) { 1908 jvalue field_value; 1909 field_value.l = value; 1910 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value); 1911 } 1912 id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value)); 1913 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return); 1914JNI_END 1915 1916 1917#define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \ 1918\ 1919JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \ 1920 JNIWrapper("SetStatic" XSTR(Result) "Field"); \ 1921 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\ 1922 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \ 1923 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \ 1924 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \ 1925\ 1926 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \ 1927 assert(id->is_static_field_id(), "invalid static field id"); \ 1928 /* Keep JVMTI addition small and only check enabled flag here. */ \ 1929 /* jni_SetField_probe() assumes that is okay to create handles. */ \ 1930 if (JvmtiExport::should_post_field_modification()) { \ 1931 jvalue field_value; \ 1932 field_value.unionType = value; \ 1933 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \ 1934 } \ 1935 id->holder()-> Fieldname##_field_put (id->offset(), value); \ 1936 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\ 1937JNI_END 1938 1939DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z) 1940DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b) 1941DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c) 1942DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s) 1943DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i) 1944DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j) 1945DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f) 1946DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d) 1947 1948 1949// 1950// String Operations 1951// 1952 1953// Unicode Interface 1954 1955DT_RETURN_MARK_DECL(NewString, jstring); 1956 1957JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len)) 1958 JNIWrapper("NewString"); 1959 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len); 1960 jstring ret = NULL; 1961 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret); 1962 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL); 1963 ret = (jstring) JNIHandles::make_local(env, string); 1964 return ret; 1965JNI_END 1966 1967 1968JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string)) 1969 JNIWrapper("GetStringLength"); 1970 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string); 1971 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string)); 1972 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret); 1973 return ret; 1974JNI_END 1975 1976 1977JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars( 1978 JNIEnv *env, jstring string, jboolean *isCopy)) 1979 JNIWrapper("GetStringChars"); 1980 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy); 1981 //%note jni_5 1982 if (isCopy != NULL) { 1983 *isCopy = JNI_TRUE; 1984 } 1985 oop s = JNIHandles::resolve_non_null(string); 1986 int s_len = java_lang_String::length(s); 1987 typeArrayOop s_value = java_lang_String::value(s); 1988 int s_offset = java_lang_String::offset(s); 1989 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination 1990 if (s_len > 0) { 1991 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len); 1992 } 1993 buf[s_len] = 0; 1994 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf); 1995 return buf; 1996JNI_END 1997 1998 1999JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars)) 2000 JNIWrapper("ReleaseStringChars"); 2001 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars); 2002 //%note jni_6 2003 if (chars != NULL) { 2004 // Since String objects are supposed to be immutable, don't copy any 2005 // new data back. A bad user will have to go after the char array. 2006 FreeHeap((void*) chars); 2007 } 2008 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return); 2009JNI_END 2010 2011 2012// UTF Interface 2013 2014DT_RETURN_MARK_DECL(NewStringUTF, jstring); 2015 2016JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes)) 2017 JNIWrapper("NewStringUTF"); 2018 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes); 2019 jstring ret; 2020 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret); 2021 2022 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL); 2023 ret = (jstring) JNIHandles::make_local(env, result); 2024 return ret; 2025JNI_END 2026 2027 2028JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string)) 2029 JNIWrapper("GetStringUTFLength"); 2030 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string); 2031 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string)); 2032 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret); 2033 return ret; 2034JNI_END 2035 2036 2037JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy)) 2038 JNIWrapper("GetStringUTFChars"); 2039 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy); 2040 ResourceMark rm; 2041 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string)); 2042 int length = (int)strlen(str); 2043 char* result = AllocateHeap(length+1, "GetStringUTFChars"); 2044 strcpy(result, str); 2045 if (isCopy != NULL) *isCopy = JNI_TRUE; 2046 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result); 2047 return result; 2048JNI_END 2049 2050 2051JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars)) 2052 JNIWrapper("ReleaseStringUTFChars"); 2053 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars); 2054 if (chars != NULL) { 2055 FreeHeap((char*) chars); 2056 } 2057 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return); 2058JNI_END 2059 2060 2061JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array)) 2062 JNIWrapper("GetArrayLength"); 2063 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array); 2064 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array)); 2065 assert(a->is_array(), "must be array"); 2066 jsize ret = a->length(); 2067 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret); 2068 return ret; 2069JNI_END 2070 2071 2072// 2073// Object Array Operations 2074// 2075 2076DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray); 2077 2078JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement)) 2079 JNIWrapper("NewObjectArray"); 2080 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement); 2081 jobjectArray ret = NULL; 2082 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret); 2083 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass))); 2084 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL); 2085 KlassHandle ak = KlassHandle(THREAD, ako); 2086 objArrayKlass::cast(ak())->initialize(CHECK_NULL); 2087 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL); 2088 oop initial_value = JNIHandles::resolve(initialElement); 2089 if (initial_value != NULL) { // array already initialized with NULL 2090 for (int index = 0; index < length; index++) { 2091 result->obj_at_put(index, initial_value); 2092 } 2093 } 2094 ret = (jobjectArray) JNIHandles::make_local(env, result); 2095 return ret; 2096JNI_END 2097 2098DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject); 2099 2100JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index)) 2101 JNIWrapper("GetObjectArrayElement"); 2102 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index); 2103 jobject ret = NULL; 2104 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret); 2105 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array)); 2106 if (a->is_within_bounds(index)) { 2107 jobject ret = JNIHandles::make_local(env, a->obj_at(index)); 2108 return ret; 2109 } else { 2110 char buf[jintAsStringSize]; 2111 sprintf(buf, "%d", index); 2112 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf); 2113 } 2114JNI_END 2115 2116DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement); 2117 2118JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value)) 2119 JNIWrapper("SetObjectArrayElement"); 2120 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value); 2121 DT_VOID_RETURN_MARK(SetObjectArrayElement); 2122 2123 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array)); 2124 oop v = JNIHandles::resolve(value); 2125 if (a->is_within_bounds(index)) { 2126 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) { 2127 a->obj_at_put(index, v); 2128 } else { 2129 THROW(vmSymbols::java_lang_ArrayStoreException()); 2130 } 2131 } else { 2132 char buf[jintAsStringSize]; 2133 sprintf(buf, "%d", index); 2134 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf); 2135 } 2136JNI_END 2137 2138 2139#define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \ 2140\ 2141 DT_RETURN_MARK_DECL_FOR(Result, New##Result##Array, Return);\ 2142\ 2143JNI_ENTRY(Return, \ 2144 jni_New##Result##Array(JNIEnv *env, jsize len)) \ 2145 JNIWrapper("New" XSTR(Result) "Array"); \ 2146 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\ 2147 Return ret = NULL;\ 2148 DT_RETURN_MARK_FOR(Result, New##Result##Array, Return, (const Return&)ret);\ 2149\ 2150 oop obj= oopFactory::Allocator(len, CHECK_0); \ 2151 ret = (Return) JNIHandles::make_local(env, obj); \ 2152 return ret;\ 2153JNI_END 2154 2155DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean) 2156DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte) 2157DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short) 2158DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char) 2159DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int) 2160DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long) 2161DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float) 2162DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double) 2163 2164 2165// Return an address which will fault if the caller writes to it. 2166 2167static char* get_bad_address() { 2168 static char* bad_address = NULL; 2169 if (bad_address == NULL) { 2170 size_t size = os::vm_allocation_granularity(); 2171 bad_address = os::reserve_memory(size); 2172 if (bad_address != NULL) { 2173 os::commit_memory(bad_address, size); 2174 os::protect_memory(bad_address, size); 2175 } 2176 } 2177 return bad_address; 2178} 2179 2180 2181#define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \ 2182\ 2183JNI_QUICK_ENTRY(ElementType*, \ 2184 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \ 2185 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \ 2186 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\ 2187 /* allocate an chunk of memory in c land */ \ 2188 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \ 2189 ElementType* result; \ 2190 int len = a->length(); \ 2191 if (len == 0) { \ 2192 /* Empty array: legal but useless, can't return NULL. \ 2193 * Return a pointer to something useless. \ 2194 * Avoid asserts in typeArrayOop. */ \ 2195 result = (ElementType*)get_bad_address(); \ 2196 } else { \ 2197 result = NEW_C_HEAP_ARRAY(ElementType, len); \ 2198 /* copy the array to the c chunk */ \ 2199 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \ 2200 } \ 2201 if (isCopy) *isCopy = JNI_TRUE; \ 2202 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\ 2203 return result; \ 2204JNI_END 2205 2206DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool) 2207DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte) 2208DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short) 2209DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char) 2210DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int) 2211DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long) 2212DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float) 2213DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double) 2214 2215 2216#define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \ 2217\ 2218JNI_QUICK_ENTRY(void, \ 2219 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \ 2220 ElementType *buf, jint mode)) \ 2221 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \ 2222 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\ 2223 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \ 2224 int len = a->length(); \ 2225 if (len != 0) { /* Empty array: nothing to free or copy. */ \ 2226 if ((mode == 0) || (mode == JNI_COMMIT)) { \ 2227 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \ 2228 } \ 2229 if ((mode == 0) || (mode == JNI_ABORT)) { \ 2230 FreeHeap(buf); \ 2231 } \ 2232 } \ 2233 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\ 2234JNI_END 2235 2236DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool) 2237DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte) 2238DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short) 2239DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char) 2240DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int) 2241DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long) 2242DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float) 2243DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double) 2244 2245#define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \ 2246 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\ 2247\ 2248JNI_ENTRY(void, \ 2249jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \ 2250 jsize len, ElementType *buf)) \ 2251 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \ 2252 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\ 2253 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \ 2254 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \ 2255 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \ 2256 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \ 2257 } else { \ 2258 if (len > 0) { \ 2259 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \ 2260 memcpy((u_char*) buf, \ 2261 (u_char*) src->Tag##_at_addr(start), \ 2262 len << sc); \ 2263 } \ 2264 } \ 2265JNI_END 2266 2267DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool) 2268DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte) 2269DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short) 2270DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char) 2271DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int) 2272DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long) 2273DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float) 2274DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double) 2275 2276#define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \ 2277 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\ 2278\ 2279JNI_ENTRY(void, \ 2280jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \ 2281 jsize len, const ElementType *buf)) \ 2282 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \ 2283 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\ 2284 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \ 2285 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \ 2286 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \ 2287 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \ 2288 } else { \ 2289 if (len > 0) { \ 2290 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \ 2291 memcpy((u_char*) dst->Tag##_at_addr(start), \ 2292 (u_char*) buf, \ 2293 len << sc); \ 2294 } \ 2295 } \ 2296JNI_END 2297 2298DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool) 2299DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte) 2300DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short) 2301DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char) 2302DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int) 2303DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long) 2304DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float) 2305DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double) 2306 2307 2308// 2309// Interception of natives 2310// 2311 2312// The RegisterNatives call being attempted tried to register with a method that 2313// is not native. Ask JVM TI what prefixes have been specified. Then check 2314// to see if the native method is now wrapped with the prefixes. See the 2315// SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 2316static methodOop find_prefixed_native(KlassHandle k, 2317 symbolHandle name, symbolHandle signature, TRAPS) { 2318 ResourceMark rm(THREAD); 2319 methodOop method; 2320 int name_len = name->utf8_length(); 2321 char* name_str = name->as_utf8(); 2322 int prefix_count; 2323 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 2324 for (int i = 0; i < prefix_count; i++) { 2325 char* prefix = prefixes[i]; 2326 int prefix_len = (int)strlen(prefix); 2327 2328 // try adding this prefix to the method name and see if it matches another method name 2329 int trial_len = name_len + prefix_len; 2330 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 2331 strcpy(trial_name_str, prefix); 2332 strcat(trial_name_str, name_str); 2333 symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len)); 2334 if (trial_name.is_null()) { 2335 continue; // no such symbol, so this prefix wasn't used, try the next prefix 2336 } 2337 method = Klass::cast(k())->lookup_method(trial_name(), signature()); 2338 if (method == NULL) { 2339 continue; // signature doesn't match, try the next prefix 2340 } 2341 if (method->is_native()) { 2342 method->set_is_prefixed_native(); 2343 return method; // wahoo, we found a prefixed version of the method, return it 2344 } 2345 // found as non-native, so prefix is good, add it, probably just need more prefixes 2346 name_len = trial_len; 2347 name_str = trial_name_str; 2348 } 2349 return NULL; // not found 2350} 2351 2352static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) { 2353 methodOop method = Klass::cast(k())->lookup_method(name(), signature()); 2354 if (method == NULL) { 2355 ResourceMark rm; 2356 stringStream st; 2357 st.print("Method %s name or signature does not match", 2358 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature())); 2359 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 2360 } 2361 if (!method->is_native()) { 2362 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 2363 method = find_prefixed_native(k, name, signature, THREAD); 2364 if (method == NULL) { 2365 ResourceMark rm; 2366 stringStream st; 2367 st.print("Method %s is not declared as native", 2368 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature())); 2369 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 2370 } 2371 } 2372 2373 if (entry != NULL) { 2374 method->set_native_function(entry, 2375 methodOopDesc::native_bind_event_is_interesting); 2376 } else { 2377 method->clear_native_function(); 2378 } 2379 if (PrintJNIResolving) { 2380 ResourceMark rm(THREAD); 2381 tty->print_cr("[Registering JNI native method %s.%s]", 2382 Klass::cast(method->method_holder())->external_name(), 2383 method->name()->as_C_string()); 2384 } 2385 return true; 2386} 2387 2388DT_RETURN_MARK_DECL(RegisterNatives, jint); 2389 2390JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz, 2391 const JNINativeMethod *methods, 2392 jint nMethods)) 2393 JNIWrapper("RegisterNatives"); 2394 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods); 2395 jint ret = 0; 2396 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret); 2397 2398 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 2399 2400 for (int index = 0; index < nMethods; index++) { 2401 const char* meth_name = methods[index].name; 2402 const char* meth_sig = methods[index].signature; 2403 int meth_name_len = (int)strlen(meth_name); 2404 2405 // The class should have been loaded (we have an instance of the class 2406 // passed in) so the method and signature should already be in the symbol 2407 // table. If they're not there, the method doesn't exist. 2408 symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len)); 2409 symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig))); 2410 2411 if (name.is_null() || signature.is_null()) { 2412 ResourceMark rm; 2413 stringStream st; 2414 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig); 2415 // Must return negative value on failure 2416 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1); 2417 } 2418 2419 bool res = register_native(h_k, name, signature, 2420 (address) methods[index].fnPtr, THREAD); 2421 if (!res) { 2422 ret = -1; 2423 break; 2424 } 2425 } 2426 return ret; 2427JNI_END 2428 2429 2430JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz)) 2431 JNIWrapper("UnregisterNatives"); 2432 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz); 2433 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)); 2434 //%note jni_2 2435 if (Klass::cast(k)->oop_is_instance()) { 2436 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) { 2437 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index)); 2438 if (m->is_native()) { 2439 m->clear_native_function(); 2440 m->set_signature_handler(NULL); 2441 } 2442 } 2443 } 2444 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0); 2445 return 0; 2446JNI_END 2447 2448// 2449// Monitor functions 2450// 2451 2452DT_RETURN_MARK_DECL(MonitorEnter, jint); 2453 2454JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj)) 2455 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj); 2456 jint ret = JNI_ERR; 2457 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret); 2458 2459 // If the object is null, we can't do anything with it 2460 if (jobj == NULL) { 2461 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR); 2462 } 2463 2464 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 2465 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR)); 2466 ret = JNI_OK; 2467 return ret; 2468JNI_END 2469 2470DT_RETURN_MARK_DECL(MonitorExit, jint); 2471 2472JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj)) 2473 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj); 2474 jint ret = JNI_ERR; 2475 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret); 2476 2477 // Don't do anything with a null object 2478 if (jobj == NULL) { 2479 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR); 2480 } 2481 2482 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 2483 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR)); 2484 2485 ret = JNI_OK; 2486 return ret; 2487JNI_END 2488 2489// 2490// Extensions 2491// 2492 2493DT_VOID_RETURN_MARK_DECL(GetStringRegion); 2494 2495JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf)) 2496 JNIWrapper("GetStringRegion"); 2497 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf); 2498 DT_VOID_RETURN_MARK(GetStringRegion); 2499 oop s = JNIHandles::resolve_non_null(string); 2500 int s_len = java_lang_String::length(s); 2501 if (start < 0 || len < 0 || start + len > s_len) { 2502 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException()); 2503 } else { 2504 if (len > 0) { 2505 int s_offset = java_lang_String::offset(s); 2506 typeArrayOop s_value = java_lang_String::value(s); 2507 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len); 2508 } 2509 } 2510JNI_END 2511 2512DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion); 2513 2514JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf)) 2515 JNIWrapper("GetStringUTFRegion"); 2516 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf); 2517 DT_VOID_RETURN_MARK(GetStringUTFRegion); 2518 oop s = JNIHandles::resolve_non_null(string); 2519 int s_len = java_lang_String::length(s); 2520 if (start < 0 || len < 0 || start + len > s_len) { 2521 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException()); 2522 } else { 2523 //%note jni_7 2524 if (len > 0) { 2525 ResourceMark rm(THREAD); 2526 char *utf_region = java_lang_String::as_utf8_string(s, start, len); 2527 int utf_len = (int)strlen(utf_region); 2528 memcpy(buf, utf_region, utf_len); 2529 buf[utf_len] = 0; 2530 } else { 2531 // JDK null-terminates the buffer even in len is zero 2532 if (buf != NULL) { 2533 buf[0] = 0; 2534 } 2535 } 2536 } 2537JNI_END 2538 2539 2540JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy)) 2541 JNIWrapper("GetPrimitiveArrayCritical"); 2542 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy); 2543 GC_locker::lock_critical(thread); 2544 if (isCopy != NULL) { 2545 *isCopy = JNI_FALSE; 2546 } 2547 oop a = JNIHandles::resolve_non_null(array); 2548 assert(a->is_array(), "just checking"); 2549 BasicType type; 2550 if (a->is_objArray()) { 2551 type = T_OBJECT; 2552 } else { 2553 type = typeArrayKlass::cast(a->klass())->element_type(); 2554 } 2555 void* ret = arrayOop(a)->base(type); 2556 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret); 2557 return ret; 2558JNI_END 2559 2560 2561JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode)) 2562 JNIWrapper("ReleasePrimitiveArrayCritical"); 2563 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode); 2564 // The array, carray and mode arguments are ignored 2565 GC_locker::unlock_critical(thread); 2566 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return); 2567JNI_END 2568 2569 2570JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy)) 2571 JNIWrapper("GetStringCritical"); 2572 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy); 2573 GC_locker::lock_critical(thread); 2574 if (isCopy != NULL) { 2575 *isCopy = JNI_FALSE; 2576 } 2577 oop s = JNIHandles::resolve_non_null(string); 2578 int s_len = java_lang_String::length(s); 2579 typeArrayOop s_value = java_lang_String::value(s); 2580 int s_offset = java_lang_String::offset(s); 2581 const jchar* ret; 2582 if (s_len > 0) { 2583 ret = s_value->char_at_addr(s_offset); 2584 } else { 2585 ret = (jchar*) s_value->base(T_CHAR); 2586 } 2587 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret); 2588 return ret; 2589JNI_END 2590 2591 2592JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars)) 2593 JNIWrapper("ReleaseStringCritical"); 2594 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars); 2595 // The str and chars arguments are ignored 2596 GC_locker::unlock_critical(thread); 2597 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return); 2598JNI_END 2599 2600 2601JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref)) 2602 JNIWrapper("jni_NewWeakGlobalRef"); 2603 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref); 2604 Handle ref_handle(thread, JNIHandles::resolve(ref)); 2605 jweak ret = JNIHandles::make_weak_global(ref_handle); 2606 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret); 2607 return ret; 2608JNI_END 2609 2610// Must be JNI_ENTRY (with HandleMark) 2611JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref)) 2612 JNIWrapper("jni_DeleteWeakGlobalRef"); 2613 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref); 2614 JNIHandles::destroy_weak_global(ref); 2615 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return); 2616JNI_END 2617 2618 2619JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env)) 2620 JNIWrapper("jni_ExceptionCheck"); 2621 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env); 2622 jni_check_async_exceptions(thread); 2623 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE; 2624 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret); 2625 return ret; 2626JNI_END 2627 2628 2629// Initialization state for three routines below relating to 2630// java.nio.DirectBuffers 2631static jint directBufferSupportInitializeStarted = 0; 2632static volatile jint directBufferSupportInitializeEnded = 0; 2633static volatile jint directBufferSupportInitializeFailed = 0; 2634static jclass bufferClass = NULL; 2635static jclass directBufferClass = NULL; 2636static jclass directByteBufferClass = NULL; 2637static jmethodID directByteBufferConstructor = NULL; 2638static jfieldID directBufferAddressField = NULL; 2639static jfieldID bufferCapacityField = NULL; 2640 2641static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) { 2642 Handle loader; // null (bootstrap) loader 2643 Handle protection_domain; // null protection domain 2644 2645 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL); 2646 return find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL); 2647} 2648 2649// These lookups are done with the NULL (bootstrap) ClassLoader to 2650// circumvent any security checks that would be done by jni_FindClass. 2651JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env)) 2652{ 2653 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; } 2654 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; } 2655 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; } 2656 return true; 2657} 2658JNI_END 2659 2660 2661static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) { 2662 if (directBufferSupportInitializeFailed) { 2663 return false; 2664 } 2665 2666 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) { 2667 if (!lookupDirectBufferClasses(env)) { 2668 directBufferSupportInitializeFailed = 1; 2669 return false; 2670 } 2671 2672 // Make global references for these 2673 bufferClass = (jclass) env->NewGlobalRef(bufferClass); 2674 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass); 2675 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass); 2676 2677 // Get needed field and method IDs 2678 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V"); 2679 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J"); 2680 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I"); 2681 2682 if ((directByteBufferConstructor == NULL) || 2683 (directBufferAddressField == NULL) || 2684 (bufferCapacityField == NULL)) { 2685 directBufferSupportInitializeFailed = 1; 2686 return false; 2687 } 2688 2689 directBufferSupportInitializeEnded = 1; 2690 } else { 2691 ThreadInVMfromNative tivn(thread); // set state as yield_all can call os:sleep 2692 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) { 2693 os::yield_all(); 2694 } 2695 } 2696 2697 return !directBufferSupportInitializeFailed; 2698} 2699 2700extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity) 2701{ 2702 // thread_from_jni_environment() will block if VM is gone. 2703 JavaThread* thread = JavaThread::thread_from_jni_environment(env); 2704 2705 JNIWrapper("jni_NewDirectByteBuffer"); 2706 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity); 2707 2708 if (!directBufferSupportInitializeEnded) { 2709 if (!initializeDirectBufferSupport(env, thread)) { 2710 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL); 2711 return NULL; 2712 } 2713 } 2714 2715 // Being paranoid about accidental sign extension on address 2716 jlong addr = (jlong) ((uintptr_t) address); 2717 // NOTE that package-private DirectByteBuffer constructor currently 2718 // takes int capacity 2719 jint cap = (jint) capacity; 2720 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap); 2721 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret); 2722 return ret; 2723} 2724 2725DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*); 2726 2727extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf) 2728{ 2729 // thread_from_jni_environment() will block if VM is gone. 2730 JavaThread* thread = JavaThread::thread_from_jni_environment(env); 2731 2732 JNIWrapper("jni_GetDirectBufferAddress"); 2733 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf); 2734 void* ret = NULL; 2735 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret); 2736 2737 if (!directBufferSupportInitializeEnded) { 2738 if (!initializeDirectBufferSupport(env, thread)) { 2739 return 0; 2740 } 2741 } 2742 2743 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) { 2744 return 0; 2745 } 2746 2747 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField); 2748 return ret; 2749} 2750 2751DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong); 2752 2753extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf) 2754{ 2755 // thread_from_jni_environment() will block if VM is gone. 2756 JavaThread* thread = JavaThread::thread_from_jni_environment(env); 2757 2758 JNIWrapper("jni_GetDirectBufferCapacity"); 2759 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf); 2760 jlong ret = -1; 2761 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret); 2762 2763 if (!directBufferSupportInitializeEnded) { 2764 if (!initializeDirectBufferSupport(env, thread)) { 2765 ret = 0; 2766 return ret; 2767 } 2768 } 2769 2770 if (buf == NULL) { 2771 return -1; 2772 } 2773 2774 if (!env->IsInstanceOf(buf, directBufferClass)) { 2775 return -1; 2776 } 2777 2778 // NOTE that capacity is currently an int in the implementation 2779 ret = env->GetIntField(buf, bufferCapacityField); 2780 return ret; 2781} 2782 2783 2784JNI_LEAF(jint, jni_GetVersion(JNIEnv *env)) 2785 JNIWrapper("GetVersion"); 2786 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env); 2787 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion); 2788 return CurrentVersion; 2789JNI_END 2790 2791extern struct JavaVM_ main_vm; 2792 2793JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm)) 2794 JNIWrapper("jni_GetJavaVM"); 2795 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm); 2796 *vm = (JavaVM *)(&main_vm); 2797 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK); 2798 return JNI_OK; 2799JNI_END 2800 2801// Structure containing all jni functions 2802struct JNINativeInterface_ jni_NativeInterface = { 2803 NULL, 2804 NULL, 2805 NULL, 2806 2807 NULL, 2808 2809 jni_GetVersion, 2810 2811 jni_DefineClass, 2812 jni_FindClass, 2813 2814 jni_FromReflectedMethod, 2815 jni_FromReflectedField, 2816 2817 jni_ToReflectedMethod, 2818 2819 jni_GetSuperclass, 2820 jni_IsAssignableFrom, 2821 2822 jni_ToReflectedField, 2823 2824 jni_Throw, 2825 jni_ThrowNew, 2826 jni_ExceptionOccurred, 2827 jni_ExceptionDescribe, 2828 jni_ExceptionClear, 2829 jni_FatalError, 2830 2831 jni_PushLocalFrame, 2832 jni_PopLocalFrame, 2833 2834 jni_NewGlobalRef, 2835 jni_DeleteGlobalRef, 2836 jni_DeleteLocalRef, 2837 jni_IsSameObject, 2838 2839 jni_NewLocalRef, 2840 jni_EnsureLocalCapacity, 2841 2842 jni_AllocObject, 2843 jni_NewObject, 2844 jni_NewObjectV, 2845 jni_NewObjectA, 2846 2847 jni_GetObjectClass, 2848 jni_IsInstanceOf, 2849 2850 jni_GetMethodID, 2851 2852 jni_CallObjectMethod, 2853 jni_CallObjectMethodV, 2854 jni_CallObjectMethodA, 2855 jni_CallBooleanMethod, 2856 jni_CallBooleanMethodV, 2857 jni_CallBooleanMethodA, 2858 jni_CallByteMethod, 2859 jni_CallByteMethodV, 2860 jni_CallByteMethodA, 2861 jni_CallCharMethod, 2862 jni_CallCharMethodV, 2863 jni_CallCharMethodA, 2864 jni_CallShortMethod, 2865 jni_CallShortMethodV, 2866 jni_CallShortMethodA, 2867 jni_CallIntMethod, 2868 jni_CallIntMethodV, 2869 jni_CallIntMethodA, 2870 jni_CallLongMethod, 2871 jni_CallLongMethodV, 2872 jni_CallLongMethodA, 2873 jni_CallFloatMethod, 2874 jni_CallFloatMethodV, 2875 jni_CallFloatMethodA, 2876 jni_CallDoubleMethod, 2877 jni_CallDoubleMethodV, 2878 jni_CallDoubleMethodA, 2879 jni_CallVoidMethod, 2880 jni_CallVoidMethodV, 2881 jni_CallVoidMethodA, 2882 2883 jni_CallNonvirtualObjectMethod, 2884 jni_CallNonvirtualObjectMethodV, 2885 jni_CallNonvirtualObjectMethodA, 2886 jni_CallNonvirtualBooleanMethod, 2887 jni_CallNonvirtualBooleanMethodV, 2888 jni_CallNonvirtualBooleanMethodA, 2889 jni_CallNonvirtualByteMethod, 2890 jni_CallNonvirtualByteMethodV, 2891 jni_CallNonvirtualByteMethodA, 2892 jni_CallNonvirtualCharMethod, 2893 jni_CallNonvirtualCharMethodV, 2894 jni_CallNonvirtualCharMethodA, 2895 jni_CallNonvirtualShortMethod, 2896 jni_CallNonvirtualShortMethodV, 2897 jni_CallNonvirtualShortMethodA, 2898 jni_CallNonvirtualIntMethod, 2899 jni_CallNonvirtualIntMethodV, 2900 jni_CallNonvirtualIntMethodA, 2901 jni_CallNonvirtualLongMethod, 2902 jni_CallNonvirtualLongMethodV, 2903 jni_CallNonvirtualLongMethodA, 2904 jni_CallNonvirtualFloatMethod, 2905 jni_CallNonvirtualFloatMethodV, 2906 jni_CallNonvirtualFloatMethodA, 2907 jni_CallNonvirtualDoubleMethod, 2908 jni_CallNonvirtualDoubleMethodV, 2909 jni_CallNonvirtualDoubleMethodA, 2910 jni_CallNonvirtualVoidMethod, 2911 jni_CallNonvirtualVoidMethodV, 2912 jni_CallNonvirtualVoidMethodA, 2913 2914 jni_GetFieldID, 2915 2916 jni_GetObjectField, 2917 jni_GetBooleanField, 2918 jni_GetByteField, 2919 jni_GetCharField, 2920 jni_GetShortField, 2921 jni_GetIntField, 2922 jni_GetLongField, 2923 jni_GetFloatField, 2924 jni_GetDoubleField, 2925 2926 jni_SetObjectField, 2927 jni_SetBooleanField, 2928 jni_SetByteField, 2929 jni_SetCharField, 2930 jni_SetShortField, 2931 jni_SetIntField, 2932 jni_SetLongField, 2933 jni_SetFloatField, 2934 jni_SetDoubleField, 2935 2936 jni_GetStaticMethodID, 2937 2938 jni_CallStaticObjectMethod, 2939 jni_CallStaticObjectMethodV, 2940 jni_CallStaticObjectMethodA, 2941 jni_CallStaticBooleanMethod, 2942 jni_CallStaticBooleanMethodV, 2943 jni_CallStaticBooleanMethodA, 2944 jni_CallStaticByteMethod, 2945 jni_CallStaticByteMethodV, 2946 jni_CallStaticByteMethodA, 2947 jni_CallStaticCharMethod, 2948 jni_CallStaticCharMethodV, 2949 jni_CallStaticCharMethodA, 2950 jni_CallStaticShortMethod, 2951 jni_CallStaticShortMethodV, 2952 jni_CallStaticShortMethodA, 2953 jni_CallStaticIntMethod, 2954 jni_CallStaticIntMethodV, 2955 jni_CallStaticIntMethodA, 2956 jni_CallStaticLongMethod, 2957 jni_CallStaticLongMethodV, 2958 jni_CallStaticLongMethodA, 2959 jni_CallStaticFloatMethod, 2960 jni_CallStaticFloatMethodV, 2961 jni_CallStaticFloatMethodA, 2962 jni_CallStaticDoubleMethod, 2963 jni_CallStaticDoubleMethodV, 2964 jni_CallStaticDoubleMethodA, 2965 jni_CallStaticVoidMethod, 2966 jni_CallStaticVoidMethodV, 2967 jni_CallStaticVoidMethodA, 2968 2969 jni_GetStaticFieldID, 2970 2971 jni_GetStaticObjectField, 2972 jni_GetStaticBooleanField, 2973 jni_GetStaticByteField, 2974 jni_GetStaticCharField, 2975 jni_GetStaticShortField, 2976 jni_GetStaticIntField, 2977 jni_GetStaticLongField, 2978 jni_GetStaticFloatField, 2979 jni_GetStaticDoubleField, 2980 2981 jni_SetStaticObjectField, 2982 jni_SetStaticBooleanField, 2983 jni_SetStaticByteField, 2984 jni_SetStaticCharField, 2985 jni_SetStaticShortField, 2986 jni_SetStaticIntField, 2987 jni_SetStaticLongField, 2988 jni_SetStaticFloatField, 2989 jni_SetStaticDoubleField, 2990 2991 jni_NewString, 2992 jni_GetStringLength, 2993 jni_GetStringChars, 2994 jni_ReleaseStringChars, 2995 2996 jni_NewStringUTF, 2997 jni_GetStringUTFLength, 2998 jni_GetStringUTFChars, 2999 jni_ReleaseStringUTFChars, 3000 3001 jni_GetArrayLength, 3002 3003 jni_NewObjectArray, 3004 jni_GetObjectArrayElement, 3005 jni_SetObjectArrayElement, 3006 3007 jni_NewBooleanArray, 3008 jni_NewByteArray, 3009 jni_NewCharArray, 3010 jni_NewShortArray, 3011 jni_NewIntArray, 3012 jni_NewLongArray, 3013 jni_NewFloatArray, 3014 jni_NewDoubleArray, 3015 3016 jni_GetBooleanArrayElements, 3017 jni_GetByteArrayElements, 3018 jni_GetCharArrayElements, 3019 jni_GetShortArrayElements, 3020 jni_GetIntArrayElements, 3021 jni_GetLongArrayElements, 3022 jni_GetFloatArrayElements, 3023 jni_GetDoubleArrayElements, 3024 3025 jni_ReleaseBooleanArrayElements, 3026 jni_ReleaseByteArrayElements, 3027 jni_ReleaseCharArrayElements, 3028 jni_ReleaseShortArrayElements, 3029 jni_ReleaseIntArrayElements, 3030 jni_ReleaseLongArrayElements, 3031 jni_ReleaseFloatArrayElements, 3032 jni_ReleaseDoubleArrayElements, 3033 3034 jni_GetBooleanArrayRegion, 3035 jni_GetByteArrayRegion, 3036 jni_GetCharArrayRegion, 3037 jni_GetShortArrayRegion, 3038 jni_GetIntArrayRegion, 3039 jni_GetLongArrayRegion, 3040 jni_GetFloatArrayRegion, 3041 jni_GetDoubleArrayRegion, 3042 3043 jni_SetBooleanArrayRegion, 3044 jni_SetByteArrayRegion, 3045 jni_SetCharArrayRegion, 3046 jni_SetShortArrayRegion, 3047 jni_SetIntArrayRegion, 3048 jni_SetLongArrayRegion, 3049 jni_SetFloatArrayRegion, 3050 jni_SetDoubleArrayRegion, 3051 3052 jni_RegisterNatives, 3053 jni_UnregisterNatives, 3054 3055 jni_MonitorEnter, 3056 jni_MonitorExit, 3057 3058 jni_GetJavaVM, 3059 3060 jni_GetStringRegion, 3061 jni_GetStringUTFRegion, 3062 3063 jni_GetPrimitiveArrayCritical, 3064 jni_ReleasePrimitiveArrayCritical, 3065 3066 jni_GetStringCritical, 3067 jni_ReleaseStringCritical, 3068 3069 jni_NewWeakGlobalRef, 3070 jni_DeleteWeakGlobalRef, 3071 3072 jni_ExceptionCheck, 3073 3074 jni_NewDirectByteBuffer, 3075 jni_GetDirectBufferAddress, 3076 jni_GetDirectBufferCapacity, 3077 3078 // New 1_6 features 3079 3080 jni_GetObjectRefType 3081}; 3082 3083 3084// For jvmti use to modify jni function table. 3085// Java threads in native contiues to run until it is transitioned 3086// to VM at safepoint. Before the transition or before it is blocked 3087// for safepoint it may access jni function table. VM could crash if 3088// any java thread access the jni function table in the middle of memcpy. 3089// To avoid this each function pointers are copied automically. 3090void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) { 3091 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 3092 intptr_t *a = (intptr_t *) jni_functions(); 3093 intptr_t *b = (intptr_t *) new_jni_NativeInterface; 3094 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) { 3095 Atomic::store_ptr(*b++, a++); 3096 } 3097} 3098 3099void quicken_jni_functions() { 3100 // Replace Get<Primitive>Field with fast versions 3101 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access() 3102 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls 3103#if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2) 3104 // windows x86 currently needs SEH wrapper and the gain of the fast 3105 // versions currently isn't certain for server vm on uniprocessor. 3106 && os::is_MP() 3107#endif 3108 ) { 3109 address func; 3110 func = JNI_FastGetField::generate_fast_get_boolean_field(); 3111 if (func != (address)-1) { 3112 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func; 3113 } 3114 func = JNI_FastGetField::generate_fast_get_byte_field(); 3115 if (func != (address)-1) { 3116 jni_NativeInterface.GetByteField = (GetByteField_t)func; 3117 } 3118 func = JNI_FastGetField::generate_fast_get_char_field(); 3119 if (func != (address)-1) { 3120 jni_NativeInterface.GetCharField = (GetCharField_t)func; 3121 } 3122 func = JNI_FastGetField::generate_fast_get_short_field(); 3123 if (func != (address)-1) { 3124 jni_NativeInterface.GetShortField = (GetShortField_t)func; 3125 } 3126 func = JNI_FastGetField::generate_fast_get_int_field(); 3127 if (func != (address)-1) { 3128 jni_NativeInterface.GetIntField = (GetIntField_t)func; 3129 } 3130 func = JNI_FastGetField::generate_fast_get_long_field(); 3131 if (func != (address)-1) { 3132 jni_NativeInterface.GetLongField = (GetLongField_t)func; 3133 } 3134 func = JNI_FastGetField::generate_fast_get_float_field(); 3135 if (func != (address)-1) { 3136 jni_NativeInterface.GetFloatField = (GetFloatField_t)func; 3137 } 3138 func = JNI_FastGetField::generate_fast_get_double_field(); 3139 if (func != (address)-1) { 3140 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func; 3141 } 3142 } 3143} 3144 3145// Returns the function structure 3146struct JNINativeInterface_* jni_functions() { 3147#ifndef JNICHECK_KERNEL 3148 if (CheckJNICalls) return jni_functions_check(); 3149#else // JNICHECK_KERNEL 3150 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm."); 3151#endif // JNICHECK_KERNEL 3152 return &jni_NativeInterface; 3153} 3154 3155// Returns the function structure 3156struct JNINativeInterface_* jni_functions_nocheck() { 3157 return &jni_NativeInterface; 3158} 3159 3160 3161// Invocation API 3162 3163 3164// Forward declaration 3165extern const struct JNIInvokeInterface_ jni_InvokeInterface; 3166 3167// Global invocation API vars 3168volatile jint vm_created = 0; 3169// Indicate whether it is safe to recreate VM 3170volatile jint safe_to_recreate_vm = 1; 3171struct JavaVM_ main_vm = {&jni_InvokeInterface}; 3172 3173 3174#define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */ 3175#define PROCSTACKSIZE 0 /* 0 means default size in HPI */ 3176enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL }; 3177 3178HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*); 3179DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint); 3180 3181_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) { 3182 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_); 3183 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_; 3184 jint ret = JNI_ERR; 3185 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret); 3186 3187 if (Threads::is_supported_jni_version(args->version)) { 3188 ret = JNI_OK; 3189 } 3190 // 1.1 style no longer supported in hotspot. 3191 // According the JNI spec, we should update args->version on return. 3192 // We also use the structure to communicate with launcher about default 3193 // stack size. 3194 if (args->version == JNI_VERSION_1_1) { 3195 args->version = JNI_VERSION_1_2; 3196 // javaStackSize is int in arguments structure 3197 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow"); 3198 args->javaStackSize = (jint)(ThreadStackSize * K); 3199 } 3200 return ret; 3201} 3202 3203HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args); 3204DT_RETURN_MARK_DECL(CreateJavaVM, jint); 3205 3206_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) { 3207 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args); 3208 3209 jint result = JNI_ERR; 3210 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result); 3211 3212 // At the moment it's only possible to have one Java VM, 3213 // since some of the runtime state is in global variables. 3214 3215 // We cannot use our mutex locks here, since they only work on 3216 // Threads. We do an atomic compare and exchange to ensure only 3217 // one thread can call this method at a time 3218 3219 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms 3220 // the add/dec implementations are dependent on whether we are running 3221 // on a multiprocessor, and at this stage of initialization the os::is_MP 3222 // function used to determine this will always return false. Atomic::xchg 3223 // does not have this problem. 3224 if (Atomic::xchg(1, &vm_created) == 1) { 3225 return JNI_ERR; // already created, or create attempt in progress 3226 } 3227 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) { 3228 return JNI_ERR; // someone tried and failed and retry not allowed. 3229 } 3230 3231 assert(vm_created == 1, "vm_created is true during the creation"); 3232 3233 /** 3234 * Certain errors during initialization are recoverable and do not 3235 * prevent this method from being called again at a later time 3236 * (perhaps with different arguments). However, at a certain 3237 * point during initialization if an error occurs we cannot allow 3238 * this function to be called again (or it will crash). In those 3239 * situations, the 'canTryAgain' flag is set to false, which atomically 3240 * sets safe_to_recreate_vm to 1, such that any new call to 3241 * JNI_CreateJavaVM will immediately fail using the above logic. 3242 */ 3243 bool can_try_again = true; 3244 3245 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again); 3246 if (result == JNI_OK) { 3247 JavaThread *thread = JavaThread::current(); 3248 /* thread is thread_in_vm here */ 3249 *vm = (JavaVM *)(&main_vm); 3250 *(JNIEnv**)penv = thread->jni_environment(); 3251 3252 // Tracks the time application was running before GC 3253 RuntimeService::record_application_start(); 3254 3255 // Notify JVMTI 3256 if (JvmtiExport::should_post_thread_life()) { 3257 JvmtiExport::post_thread_start(thread); 3258 } 3259 // Check if we should compile all classes on bootclasspath 3260 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();) 3261 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving. 3262 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); 3263 } else { 3264 if (can_try_again) { 3265 // reset safe_to_recreate_vm to 1 so that retrial would be possible 3266 safe_to_recreate_vm = 1; 3267 } 3268 3269 // Creation failed. We must reset vm_created 3270 *vm = 0; 3271 *(JNIEnv**)penv = 0; 3272 // reset vm_created last to avoid race condition. Use OrderAccess to 3273 // control both compiler and architectural-based reordering. 3274 OrderAccess::release_store(&vm_created, 0); 3275 } 3276 3277 return result; 3278} 3279 3280HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \ 3281 JavaVM**, jsize, jsize*); 3282HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint); 3283 3284_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) { 3285 // See bug 4367188, the wrapper can sometimes cause VM crashes 3286 // JNIWrapper("GetCreatedJavaVMs"); 3287 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \ 3288 vm_buf, bufLen, numVMs); 3289 if (vm_created) { 3290 if (numVMs != NULL) *numVMs = 1; 3291 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm); 3292 } else { 3293 if (numVMs != NULL) *numVMs = 0; 3294 } 3295 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK); 3296 return JNI_OK; 3297} 3298 3299extern "C" { 3300 3301DT_RETURN_MARK_DECL(DestroyJavaVM, jint); 3302 3303jint JNICALL jni_DestroyJavaVM(JavaVM *vm) { 3304 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm); 3305 jint res = JNI_ERR; 3306 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res); 3307 3308 if (!vm_created) { 3309 res = JNI_ERR; 3310 return res; 3311 } 3312 3313 JNIWrapper("DestroyJavaVM"); 3314 JNIEnv *env; 3315 JavaVMAttachArgs destroyargs; 3316 destroyargs.version = CurrentVersion; 3317 destroyargs.name = (char *)"DestroyJavaVM"; 3318 destroyargs.group = NULL; 3319 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs); 3320 if (res != JNI_OK) { 3321 return res; 3322 } 3323 3324 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering. 3325 JavaThread* thread = JavaThread::current(); 3326 ThreadStateTransition::transition_from_native(thread, _thread_in_vm); 3327 if (Threads::destroy_vm()) { 3328 // Should not change thread state, VM is gone 3329 vm_created = false; 3330 res = JNI_OK; 3331 return res; 3332 } else { 3333 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); 3334 res = JNI_ERR; 3335 return res; 3336 } 3337} 3338 3339 3340static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) { 3341 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args; 3342 3343 // Check below commented out from JDK1.2fcs as well 3344 /* 3345 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) { 3346 return JNI_EVERSION; 3347 } 3348 */ 3349 3350 Thread* t = ThreadLocalStorage::get_thread_slow(); 3351 if (t != NULL) { 3352 // If the thread has been attached this operation is a no-op 3353 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment(); 3354 return JNI_OK; 3355 } 3356 3357 // Create a thread and mark it as attaching so it will be skipped by the 3358 // ThreadsListEnumerator - see CR 6404306 3359 JavaThread* thread = new JavaThread(true); 3360 3361 // Set correct safepoint info. The thread is going to call into Java when 3362 // initializing the Java level thread object. Hence, the correct state must 3363 // be set in order for the Safepoint code to deal with it correctly. 3364 thread->set_thread_state(_thread_in_vm); 3365 // Must do this before initialize_thread_local_storage 3366 thread->record_stack_base_and_size(); 3367 thread->initialize_thread_local_storage(); 3368 3369 if (!os::create_attached_thread(thread)) { 3370 delete thread; 3371 return JNI_ERR; 3372 } 3373 thread->initialize_tlab(); 3374 3375 // Crucial that we do not have a safepoint check for this thread, since it has 3376 // not been added to the Thread list yet. 3377 { Threads_lock->lock_without_safepoint_check(); 3378 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to 3379 // avoid this thread trying to do a GC before it is added to the thread-list 3380 thread->set_active_handles(JNIHandleBlock::allocate_block()); 3381 Threads::add(thread, daemon); 3382 Threads_lock->unlock(); 3383 } 3384 // Create thread group and name info from attach arguments 3385 oop group = NULL; 3386 char* thread_name = NULL; 3387 if (args != NULL && Threads::is_supported_jni_version(args->version)) { 3388 group = JNIHandles::resolve(args->group); 3389 thread_name = args->name; // may be NULL 3390 } 3391 if (group == NULL) group = Universe::main_thread_group(); 3392 3393 // Create Java level thread object and attach it to this thread 3394 bool attach_failed = false; 3395 { 3396 EXCEPTION_MARK; 3397 HandleMark hm(THREAD); 3398 Handle thread_group(THREAD, group); 3399 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD); 3400 if (HAS_PENDING_EXCEPTION) { 3401 CLEAR_PENDING_EXCEPTION; 3402 // cleanup outside the handle mark. 3403 attach_failed = true; 3404 } 3405 } 3406 3407 if (attach_failed) { 3408 // Added missing cleanup 3409 thread->cleanup_failed_attach_current_thread(); 3410 return JNI_ERR; 3411 } 3412 3413 // mark the thread as no longer attaching 3414 // this uses a fence to push the change through so we don't have 3415 // to regrab the threads_lock 3416 thread->set_attached(); 3417 3418 // Enable stack overflow checks 3419 thread->create_stack_guard_pages(); 3420 3421 // Set java thread status. 3422 java_lang_Thread::set_thread_status(thread->threadObj(), 3423 java_lang_Thread::RUNNABLE); 3424 3425 // Notify the debugger 3426 if (JvmtiExport::should_post_thread_life()) { 3427 JvmtiExport::post_thread_start(thread); 3428 } 3429 3430 *(JNIEnv**)penv = thread->jni_environment(); 3431 3432 // Now leaving the VM, so change thread_state. This is normally automatically taken care 3433 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by 3434 // using ThreadStateTransition::transition, we do a callback to the safepoint code if 3435 // needed. 3436 3437 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); 3438 3439 // Perform any platform dependent FPU setup 3440 os::setup_fpu(); 3441 3442 return JNI_OK; 3443} 3444 3445 3446jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) { 3447 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args); 3448 if (!vm_created) { 3449 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR); 3450 return JNI_ERR; 3451 } 3452 3453 JNIWrapper("AttachCurrentThread"); 3454 jint ret = attach_current_thread(vm, penv, _args, false); 3455 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret); 3456 return ret; 3457} 3458 3459 3460jint JNICALL jni_DetachCurrentThread(JavaVM *vm) { 3461 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm); 3462 VM_Exit::block_if_vm_exited(); 3463 3464 JNIWrapper("DetachCurrentThread"); 3465 3466 // If the thread has been deattacted the operations is a no-op 3467 if (ThreadLocalStorage::thread() == NULL) { 3468 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK); 3469 return JNI_OK; 3470 } 3471 3472 JavaThread* thread = JavaThread::current(); 3473 if (thread->has_last_Java_frame()) { 3474 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR); 3475 // Can't detach a thread that's running java, that can't work. 3476 return JNI_ERR; 3477 } 3478 3479 // Safepoint support. Have to do call-back to safepoint code, if in the 3480 // middel of a safepoint operation 3481 ThreadStateTransition::transition_from_native(thread, _thread_in_vm); 3482 3483 // XXX: Note that JavaThread::exit() call below removes the guards on the 3484 // stack pages set up via enable_stack_{red,yellow}_zone() calls 3485 // above in jni_AttachCurrentThread. Unfortunately, while the setting 3486 // of the guards is visible in jni_AttachCurrentThread above, 3487 // the removal of the guards is buried below in JavaThread::exit() 3488 // here. The abstraction should be more symmetrically either exposed 3489 // or hidden (e.g. it could probably be hidden in the same 3490 // (platform-dependent) methods where we do alternate stack 3491 // maintenance work?) 3492 thread->exit(false, JavaThread::jni_detach); 3493 delete thread; 3494 3495 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK); 3496 return JNI_OK; 3497} 3498 3499DT_RETURN_MARK_DECL(GetEnv, jint); 3500 3501jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) { 3502 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version); 3503 jint ret = JNI_ERR; 3504 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret); 3505 3506 if (!vm_created) { 3507 *penv = NULL; 3508 ret = JNI_EDETACHED; 3509 return ret; 3510 } 3511 3512 if (JvmtiExport::is_jvmti_version(version)) { 3513 ret = JvmtiExport::get_jvmti_interface(vm, penv, version); 3514 return ret; 3515 } 3516 3517#ifndef JVMPI_VERSION_1 3518// need these in order to be polite about older agents 3519#define JVMPI_VERSION_1 ((jint)0x10000001) 3520#define JVMPI_VERSION_1_1 ((jint)0x10000002) 3521#define JVMPI_VERSION_1_2 ((jint)0x10000003) 3522#endif // !JVMPI_VERSION_1 3523 3524 Thread* thread = ThreadLocalStorage::thread(); 3525 if (thread != NULL && thread->is_Java_thread()) { 3526 if (Threads::is_supported_jni_version_including_1_1(version)) { 3527 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment(); 3528 ret = JNI_OK; 3529 return ret; 3530 3531 } else if (version == JVMPI_VERSION_1 || 3532 version == JVMPI_VERSION_1_1 || 3533 version == JVMPI_VERSION_1_2) { 3534 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported."); 3535 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI)."); 3536 ret = JNI_EVERSION; 3537 return ret; 3538 } else if (JvmtiExport::is_jvmdi_version(version)) { 3539 tty->print_cr("FATAL ERROR: JVMDI is no longer supported."); 3540 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI)."); 3541 ret = JNI_EVERSION; 3542 return ret; 3543 } else { 3544 *penv = NULL; 3545 ret = JNI_EVERSION; 3546 return ret; 3547 } 3548 } else { 3549 *penv = NULL; 3550 ret = JNI_EDETACHED; 3551 return ret; 3552 } 3553} 3554 3555 3556jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) { 3557 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args); 3558 if (!vm_created) { 3559 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR); 3560 return JNI_ERR; 3561 } 3562 3563 JNIWrapper("AttachCurrentThreadAsDaemon"); 3564 jint ret = attach_current_thread(vm, penv, _args, true); 3565 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret); 3566 return ret; 3567} 3568 3569 3570} // End extern "C" 3571 3572const struct JNIInvokeInterface_ jni_InvokeInterface = { 3573 NULL, 3574 NULL, 3575 NULL, 3576 3577 jni_DestroyJavaVM, 3578 jni_AttachCurrentThread, 3579 jni_DetachCurrentThread, 3580 jni_GetEnv, 3581 jni_AttachCurrentThreadAsDaemon 3582}; 3583