36 #include "classfile/modules.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "compiler/compiler_globals.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "gc/shared/stringdedup/stringDedup.hpp"
44 #include "interpreter/linkResolver.hpp"
45 #include "jni.h"
46 #include "jvm.h"
47 #include "logging/log.hpp"
48 #include "memory/allocation.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/arrayOop.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceOop.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/markWord.hpp"
60 #include "oops/method.hpp"
61 #include "oops/objArrayKlass.hpp"
62 #include "oops/objArrayOop.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/symbol.hpp"
65 #include "oops/typeArrayKlass.hpp"
66 #include "oops/typeArrayOop.inline.hpp"
67 #include "prims/jniCheck.hpp"
68 #include "prims/jniExport.hpp"
69 #include "prims/jniFastGetField.hpp"
70 #include "prims/jvm_misc.hpp"
71 #include "prims/jvmtiExport.hpp"
72 #include "prims/jvmtiThreadState.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/fieldDescriptor.inline.hpp"
403 int modifiers = java_lang_reflect_Field::modifiers(reflected);
404
405 // Make sure class is initialized before handing id's out to fields
406 k1->initialize(CHECK_NULL);
407
408 // First check if this is a static field
409 if (modifiers & JVM_ACC_STATIC) {
410 int offset = InstanceKlass::cast(k1)->field_offset( slot );
411 JNIid* id = InstanceKlass::cast(k1)->jni_id_for(offset);
412 assert(id != nullptr, "corrupt Field object");
413 DEBUG_ONLY(id->set_is_static_field_id();)
414 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the Klass*
415 ret = jfieldIDWorkaround::to_static_jfieldID(id);
416 return ret;
417 }
418
419 // The slot is the index of the field description in the field-array
420 // The jfieldID is the offset of the field within the object
421 // It may also have hash bits for k, if VerifyJNIFields is turned on.
422 int offset = InstanceKlass::cast(k1)->field_offset( slot );
423 assert(InstanceKlass::cast(k1)->contains_field_offset(offset), "stay within object");
424 ret = jfieldIDWorkaround::to_instance_jfieldID(k1, offset);
425 return ret;
426 JNI_END
427
428
429 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject
430 , HOTSPOT_JNI_TOREFLECTEDMETHOD_RETURN(_ret_ref));
431
432 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
433 HOTSPOT_JNI_TOREFLECTEDMETHOD_ENTRY(env, cls, (uintptr_t) method_id, isStatic);
434
435 jobject ret = nullptr;
436 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
437
438 methodHandle m (THREAD, Method::resolve_jmethod_id(method_id));
439 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
440 oop reflection_method;
441 if (m->is_object_initializer()) {
442 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
443 } else {
444 // Note: Static initializers can theoretically be here, if JNI users manage
445 // to get their jmethodID. Record them as plain methods.
446 reflection_method = Reflection::new_method(m, false, CHECK_NULL);
447 }
448 ret = JNIHandles::make_local(THREAD, reflection_method);
449 return ret;
450 JNI_END
451
452 DT_RETURN_MARK_DECL(GetSuperclass, jclass
453 , HOTSPOT_JNI_GETSUPERCLASS_RETURN(_ret_ref));
454
455 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
456 HOTSPOT_JNI_GETSUPERCLASS_ENTRY(env, sub);
457
458 jclass obj = nullptr;
459 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
460
461 oop mirror = JNIHandles::resolve_non_null(sub);
780 }
781
782 friend class SignatureIterator; // so do_parameters_on can call do_type
783 void do_type(BasicType type) {
784 switch (type) {
785 // these are coerced to int when using va_arg
786 case T_BYTE:
787 case T_CHAR:
788 case T_SHORT:
789 case T_INT: push_int(va_arg(_ap, jint)); break;
790 case T_BOOLEAN: push_boolean((jboolean) va_arg(_ap, jint)); break;
791
792 // each of these paths is exercised by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
793
794 case T_LONG: push_long(va_arg(_ap, jlong)); break;
795 // float is coerced to double w/ va_arg
796 case T_FLOAT: push_float((jfloat) va_arg(_ap, jdouble)); break;
797 case T_DOUBLE: push_double(va_arg(_ap, jdouble)); break;
798
799 case T_ARRAY:
800 case T_OBJECT: push_object(va_arg(_ap, jobject)); break;
801 default: ShouldNotReachHere();
802 }
803 }
804
805 public:
806 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
807 : JNI_ArgumentPusher(Method::resolve_jmethod_id(method_id)) {
808 set_ap(rap);
809 }
810
811 ~JNI_ArgumentPusherVaArg() {
812 va_end(_ap);
813 }
814
815 virtual void push_arguments_on(JavaCallArguments* arguments) {
816 _arguments = arguments;
817 do_parameters_on(this);
818 }
819 };
820
947 result->set_type(args->return_type());
948
949 // Invoke the method. Result is returned as oop.
950 JavaCalls::call(result, method, &java_args, CHECK);
951
952 // Convert result
953 if (is_reference_type(result->get_type())) {
954 result->set_jobject(JNIHandles::make_local(THREAD, result->get_oop()));
955 }
956 }
957
958 DT_RETURN_MARK_DECL(AllocObject, jobject
959 , HOTSPOT_JNI_ALLOCOBJECT_RETURN(_ret_ref));
960
961 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
962 HOTSPOT_JNI_ALLOCOBJECT_ENTRY(env, clazz);
963
964 jobject ret = nullptr;
965 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
966
967 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
968 ret = JNIHandles::make_local(THREAD, i);
969 return ret;
970 JNI_END
971
972 DT_RETURN_MARK_DECL(NewObjectA, jobject
973 , HOTSPOT_JNI_NEWOBJECTA_RETURN(_ret_ref));
974
975 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
976 HOTSPOT_JNI_NEWOBJECTA_ENTRY(env, clazz, (uintptr_t) methodID);
977
978 jobject obj = nullptr;
979 DT_RETURN_MARK(NewObjectA, jobject, (const jobject&)obj);
980
981 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
982 obj = JNIHandles::make_local(THREAD, i);
983 JavaValue jvalue(T_VOID);
984 JNI_ArgumentPusherArray ap(methodID, args);
985 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
986 return obj;
987 JNI_END
988
989
990 DT_RETURN_MARK_DECL(NewObjectV, jobject
991 , HOTSPOT_JNI_NEWOBJECTV_RETURN(_ret_ref));
992
993 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
994 HOTSPOT_JNI_NEWOBJECTV_ENTRY(env, clazz, (uintptr_t) methodID);
995
996 jobject obj = nullptr;
997 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
998
999 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
1000 obj = JNIHandles::make_local(THREAD, i);
1001 JavaValue jvalue(T_VOID);
1002 JNI_ArgumentPusherVaArg ap(methodID, args);
1003 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1004 return obj;
1005 JNI_END
1006
1007
1008 DT_RETURN_MARK_DECL(NewObject, jobject
1009 , HOTSPOT_JNI_NEWOBJECT_RETURN(_ret_ref));
1010
1011 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1012 HOTSPOT_JNI_NEWOBJECT_ENTRY(env, clazz, (uintptr_t) methodID);
1013
1014 jobject obj = nullptr;
1015 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1016
1017 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
1018 obj = JNIHandles::make_local(THREAD, i);
1019 va_list args;
1020 va_start(args, methodID);
1021 JavaValue jvalue(T_VOID);
1022 JNI_ArgumentPusherVaArg ap(methodID, args);
1023 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1024 va_end(args);
1025 return obj;
1026 JNI_END
1027
1028
1029 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1030 HOTSPOT_JNI_GETOBJECTCLASS_ENTRY(env, obj);
1031
1032 Klass* k = JNIHandles::resolve_non_null(obj)->klass();
1033 jclass ret =
1034 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1035
1036 HOTSPOT_JNI_GETOBJECTCLASS_RETURN(ret);
1037 return ret;
1038 JNI_END
1039
1040 JNI_ENTRY_NO_PRESERVE(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1041 HOTSPOT_JNI_ISINSTANCEOF_ENTRY(env, obj, clazz);
1042
1043 jboolean ret = JNI_TRUE;
1044 if (obj != nullptr) {
1755 // table. If they're not there, the field doesn't exist.
1756 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1757 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1758 if (fieldname == nullptr || signame == nullptr) {
1759 ResourceMark rm;
1760 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1761 }
1762
1763 // Make sure class is initialized before handing id's out to fields
1764 k->initialize(CHECK_NULL);
1765
1766 fieldDescriptor fd;
1767 if (!k->is_instance_klass() ||
1768 !InstanceKlass::cast(k)->find_field(fieldname, signame, false, &fd)) {
1769 ResourceMark rm;
1770 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1771 }
1772
1773 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1774 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1775 ret = jfieldIDWorkaround::to_instance_jfieldID(k, fd.offset());
1776 return ret;
1777 JNI_END
1778
1779
1780 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1781 HOTSPOT_JNI_GETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID);
1782 oop o = JNIHandles::resolve_non_null(obj);
1783 Klass* k = o->klass();
1784 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1785 // Keep JVMTI addition small and only check enabled flag here.
1786 // jni_GetField_probe() assumes that is okay to create handles.
1787 if (JvmtiExport::should_post_field_access()) {
1788 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1789 }
1790 oop loaded_obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(o, offset);
1791 jobject ret = JNIHandles::make_local(THREAD, loaded_obj);
1792 HOTSPOT_JNI_GETOBJECTFIELD_RETURN(ret);
1793 return ret;
1794 JNI_END
1795
1796
1797
1798 #define DEFINE_GETFIELD(Return,Fieldname,Result \
1799 , EntryProbe, ReturnProbe) \
1800 \
1801 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return \
1802 , ReturnProbe); \
1803 \
1804 JNI_ENTRY_NO_PRESERVE(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1805 \
1806 EntryProbe; \
1807 Return ret = 0;\
1808 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1809 \
1810 oop o = JNIHandles::resolve_non_null(obj); \
1811 Klass* k = o->klass(); \
1812 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1813 /* Keep JVMTI addition small and only check enabled flag here. */ \
1814 if (JvmtiExport::should_post_field_access()) { \
1815 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); \
1816 } \
1817 ret = o->Fieldname##_field(offset); \
1863 return (address)jni_GetLongField;
1864 }
1865 address jni_GetFloatField_addr() {
1866 return (address)jni_GetFloatField;
1867 }
1868 address jni_GetDoubleField_addr() {
1869 return (address)jni_GetDoubleField;
1870 }
1871
1872 JNI_ENTRY_NO_PRESERVE(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1873 HOTSPOT_JNI_SETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID, value);
1874 oop o = JNIHandles::resolve_non_null(obj);
1875 Klass* k = o->klass();
1876 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1877 // Keep JVMTI addition small and only check enabled flag here.
1878 if (JvmtiExport::should_post_field_modification()) {
1879 jvalue field_value;
1880 field_value.l = value;
1881 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, JVM_SIGNATURE_CLASS, (jvalue *)&field_value);
1882 }
1883 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(o, offset, JNIHandles::resolve(value));
1884 HOTSPOT_JNI_SETOBJECTFIELD_RETURN();
1885 JNI_END
1886
1887 // TODO: make this a template
1888
1889 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType \
1890 , EntryProbe, ReturnProbe) \
1891 \
1892 JNI_ENTRY_NO_PRESERVE(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1893 \
1894 EntryProbe; \
1895 \
1896 oop o = JNIHandles::resolve_non_null(obj); \
1897 Klass* k = o->klass(); \
1898 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1899 /* Keep JVMTI addition small and only check enabled flag here. */ \
1900 if (JvmtiExport::should_post_field_modification()) { \
1901 jvalue field_value; \
1902 field_value.unionType = value; \
1903 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
2292
2293 oop initial_value = JNIHandles::resolve(initialElement);
2294 if (initial_value != nullptr) { // array already initialized with null
2295 for (int index = 0; index < length; index++) {
2296 result->obj_at_put(index, initial_value);
2297 }
2298 }
2299 ret = (jobjectArray) JNIHandles::make_local(THREAD, result);
2300 return ret;
2301 JNI_END
2302
2303 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject
2304 , HOTSPOT_JNI_GETOBJECTARRAYELEMENT_RETURN(_ret_ref));
2305
2306 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2307 HOTSPOT_JNI_GETOBJECTARRAYELEMENT_ENTRY(env, array, index);
2308 jobject ret = nullptr;
2309 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2310 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2311 if (a->is_within_bounds(index)) {
2312 ret = JNIHandles::make_local(THREAD, a->obj_at(index));
2313 return ret;
2314 } else {
2315 ResourceMark rm(THREAD);
2316 stringStream ss;
2317 ss.print("Index %d out of bounds for length %d", index, a->length());
2318 THROW_MSG_NULL(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2319 }
2320 JNI_END
2321
2322 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement
2323 , HOTSPOT_JNI_SETOBJECTARRAYELEMENT_RETURN());
2324
2325 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2326 HOTSPOT_JNI_SETOBJECTARRAYELEMENT_ENTRY(env, array, index, value);
2327 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2328
2329 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2330 oop v = JNIHandles::resolve(value);
2331 if (a->is_within_bounds(index)) {
2332 if (v == nullptr || v->is_a(ObjArrayKlass::cast(a->klass())->element_klass())) {
2333 a->obj_at_put(index, v);
2334 } else {
2335 ResourceMark rm(THREAD);
2336 stringStream ss;
2337 Klass *bottom_kl = ObjArrayKlass::cast(a->klass())->bottom_klass();
2338 ss.print("type mismatch: can not store %s to %s[%d]",
2339 v->klass()->external_name(),
2340 bottom_kl->is_typeArray_klass() ? type2name_tab[ArrayKlass::cast(bottom_kl)->element_type()] : bottom_kl->external_name(),
2341 index);
2342 for (int dims = ArrayKlass::cast(a->klass())->dimension(); dims > 1; --dims) {
2343 ss.print("[]");
2344 }
2345 THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
2346 }
2347 } else {
2348 ResourceMark rm(THREAD);
2349 stringStream ss;
2350 ss.print("Index %d out of bounds for length %d", index, a->length());
2351 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2352 }
2353 JNI_END
2354
2355
2356
2357 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result \
2358 ,EntryProbe,ReturnProbe) \
2359 \
2360 DT_RETURN_MARK_DECL(New##Result##Array, Return \
2361 , ReturnProbe); \
2362 \
2363 JNI_ENTRY(Return, \
2364 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2365 EntryProbe; \
2366 Return ret = nullptr;\
2367 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2368 \
2369 oop obj= oopFactory::Allocator(len, CHECK_NULL); \
2370 ret = (Return) JNIHandles::make_local(THREAD, obj); \
2371 return ret;\
2372 JNI_END
2708 JNI_END
2709
2710 //
2711 // Monitor functions
2712 //
2713
2714 DT_RETURN_MARK_DECL(MonitorEnter, jint
2715 , HOTSPOT_JNI_MONITORENTER_RETURN(_ret_ref));
2716
2717 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2718 HOTSPOT_JNI_MONITORENTER_ENTRY(env, jobj);
2719 jint ret = JNI_ERR;
2720 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2721
2722 // If the object is null, we can't do anything with it
2723 if (jobj == nullptr) {
2724 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2725 }
2726
2727 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2728 ObjectSynchronizer::jni_enter(obj, thread);
2729 return JNI_OK;
2730 JNI_END
2731
2732 DT_RETURN_MARK_DECL(MonitorExit, jint
2733 , HOTSPOT_JNI_MONITOREXIT_RETURN(_ret_ref));
2734
2735 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2736 HOTSPOT_JNI_MONITOREXIT_ENTRY(env, jobj);
2737 jint ret = JNI_ERR;
2738 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2739
2740 // Don't do anything with a null object
2741 if (jobj == nullptr) {
2742 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2743 }
2744
2745 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2746 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2747 return JNI_OK;
2748 JNI_END
|
36 #include "classfile/modules.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "compiler/compiler_globals.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "gc/shared/stringdedup/stringDedup.hpp"
44 #include "interpreter/linkResolver.hpp"
45 #include "jni.h"
46 #include "jvm.h"
47 #include "logging/log.hpp"
48 #include "memory/allocation.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/arrayOop.hpp"
56 #include "oops/flatArrayOop.inline.hpp"
57 #include "oops/inlineKlass.inline.hpp"
58 #include "oops/instanceKlass.inline.hpp"
59 #include "oops/instanceOop.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/markWord.hpp"
62 #include "oops/method.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/symbol.hpp"
67 #include "oops/typeArrayKlass.hpp"
68 #include "oops/typeArrayOop.inline.hpp"
69 #include "prims/jniCheck.hpp"
70 #include "prims/jniExport.hpp"
71 #include "prims/jniFastGetField.hpp"
72 #include "prims/jvm_misc.hpp"
73 #include "prims/jvmtiExport.hpp"
74 #include "prims/jvmtiThreadState.hpp"
75 #include "runtime/arguments.hpp"
76 #include "runtime/atomic.hpp"
77 #include "runtime/fieldDescriptor.inline.hpp"
405 int modifiers = java_lang_reflect_Field::modifiers(reflected);
406
407 // Make sure class is initialized before handing id's out to fields
408 k1->initialize(CHECK_NULL);
409
410 // First check if this is a static field
411 if (modifiers & JVM_ACC_STATIC) {
412 int offset = InstanceKlass::cast(k1)->field_offset( slot );
413 JNIid* id = InstanceKlass::cast(k1)->jni_id_for(offset);
414 assert(id != nullptr, "corrupt Field object");
415 DEBUG_ONLY(id->set_is_static_field_id();)
416 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the Klass*
417 ret = jfieldIDWorkaround::to_static_jfieldID(id);
418 return ret;
419 }
420
421 // The slot is the index of the field description in the field-array
422 // The jfieldID is the offset of the field within the object
423 // It may also have hash bits for k, if VerifyJNIFields is turned on.
424 int offset = InstanceKlass::cast(k1)->field_offset( slot );
425 bool is_flat = InstanceKlass::cast(k1)->field_is_flat(slot);
426 assert(InstanceKlass::cast(k1)->contains_field_offset(offset), "stay within object");
427 ret = jfieldIDWorkaround::to_instance_jfieldID(k1, offset, is_flat);
428 return ret;
429 JNI_END
430
431
432 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject
433 , HOTSPOT_JNI_TOREFLECTEDMETHOD_RETURN(_ret_ref));
434
435 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
436 HOTSPOT_JNI_TOREFLECTEDMETHOD_ENTRY(env, cls, (uintptr_t) method_id, isStatic);
437
438 jobject ret = nullptr;
439 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
440
441 methodHandle m (THREAD, Method::resolve_jmethod_id(method_id));
442 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
443 oop reflection_method;
444 if (m->is_object_constructor()) {
445 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
446 } else {
447 // Note: Static initializers can theoretically be here, if JNI users manage
448 // to get their jmethodID. Record them as plain methods.
449 reflection_method = Reflection::new_method(m, false, CHECK_NULL);
450 }
451 ret = JNIHandles::make_local(THREAD, reflection_method);
452 return ret;
453 JNI_END
454
455 DT_RETURN_MARK_DECL(GetSuperclass, jclass
456 , HOTSPOT_JNI_GETSUPERCLASS_RETURN(_ret_ref));
457
458 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
459 HOTSPOT_JNI_GETSUPERCLASS_ENTRY(env, sub);
460
461 jclass obj = nullptr;
462 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
463
464 oop mirror = JNIHandles::resolve_non_null(sub);
783 }
784
785 friend class SignatureIterator; // so do_parameters_on can call do_type
786 void do_type(BasicType type) {
787 switch (type) {
788 // these are coerced to int when using va_arg
789 case T_BYTE:
790 case T_CHAR:
791 case T_SHORT:
792 case T_INT: push_int(va_arg(_ap, jint)); break;
793 case T_BOOLEAN: push_boolean((jboolean) va_arg(_ap, jint)); break;
794
795 // each of these paths is exercised by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
796
797 case T_LONG: push_long(va_arg(_ap, jlong)); break;
798 // float is coerced to double w/ va_arg
799 case T_FLOAT: push_float((jfloat) va_arg(_ap, jdouble)); break;
800 case T_DOUBLE: push_double(va_arg(_ap, jdouble)); break;
801
802 case T_ARRAY:
803 case T_OBJECT: push_object(va_arg(_ap, jobject)); break;
804 default: ShouldNotReachHere();
805 }
806 }
807
808 public:
809 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
810 : JNI_ArgumentPusher(Method::resolve_jmethod_id(method_id)) {
811 set_ap(rap);
812 }
813
814 ~JNI_ArgumentPusherVaArg() {
815 va_end(_ap);
816 }
817
818 virtual void push_arguments_on(JavaCallArguments* arguments) {
819 _arguments = arguments;
820 do_parameters_on(this);
821 }
822 };
823
950 result->set_type(args->return_type());
951
952 // Invoke the method. Result is returned as oop.
953 JavaCalls::call(result, method, &java_args, CHECK);
954
955 // Convert result
956 if (is_reference_type(result->get_type())) {
957 result->set_jobject(JNIHandles::make_local(THREAD, result->get_oop()));
958 }
959 }
960
961 DT_RETURN_MARK_DECL(AllocObject, jobject
962 , HOTSPOT_JNI_ALLOCOBJECT_RETURN(_ret_ref));
963
964 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
965 HOTSPOT_JNI_ALLOCOBJECT_ENTRY(env, clazz);
966
967 jobject ret = nullptr;
968 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
969
970 oop clazzoop = JNIHandles::resolve_non_null(clazz);
971 Klass* k = java_lang_Class::as_Klass(clazzoop);
972 if (k == nullptr || k->is_inline_klass()) {
973 ResourceMark rm(THREAD);
974 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
975 }
976 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
977 ret = JNIHandles::make_local(THREAD, i);
978 return ret;
979 JNI_END
980
981 DT_RETURN_MARK_DECL(NewObjectA, jobject
982 , HOTSPOT_JNI_NEWOBJECTA_RETURN(_ret_ref));
983
984 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
985 HOTSPOT_JNI_NEWOBJECTA_ENTRY(env, clazz, (uintptr_t) methodID);
986
987 jobject obj = nullptr;
988 DT_RETURN_MARK(NewObjectA, jobject, (const jobject&)obj);
989
990 oop clazzoop = JNIHandles::resolve_non_null(clazz);
991 Klass* k = java_lang_Class::as_Klass(clazzoop);
992 if (k == nullptr) {
993 ResourceMark rm(THREAD);
994 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
995 }
996
997 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
998 obj = JNIHandles::make_local(THREAD, i);
999 JavaValue jvalue(T_VOID);
1000 JNI_ArgumentPusherArray ap(methodID, args);
1001 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1002
1003 return obj;
1004 JNI_END
1005
1006
1007 DT_RETURN_MARK_DECL(NewObjectV, jobject
1008 , HOTSPOT_JNI_NEWOBJECTV_RETURN(_ret_ref));
1009
1010 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1011 HOTSPOT_JNI_NEWOBJECTV_ENTRY(env, clazz, (uintptr_t) methodID);
1012
1013 jobject obj = nullptr;
1014 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1015
1016 oop clazzoop = JNIHandles::resolve_non_null(clazz);
1017 Klass* k = java_lang_Class::as_Klass(clazzoop);
1018 if (k == nullptr) {
1019 ResourceMark rm(THREAD);
1020 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1021 }
1022
1023 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
1024 obj = JNIHandles::make_local(THREAD, i);
1025 JavaValue jvalue(T_VOID);
1026 JNI_ArgumentPusherVaArg ap(methodID, args);
1027 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1028
1029 return obj;
1030 JNI_END
1031
1032
1033 DT_RETURN_MARK_DECL(NewObject, jobject
1034 , HOTSPOT_JNI_NEWOBJECT_RETURN(_ret_ref));
1035
1036 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1037 HOTSPOT_JNI_NEWOBJECT_ENTRY(env, clazz, (uintptr_t) methodID);
1038
1039 jobject obj = nullptr;
1040 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1041
1042 oop clazzoop = JNIHandles::resolve_non_null(clazz);
1043 Klass* k = java_lang_Class::as_Klass(clazzoop);
1044 if (k == nullptr) {
1045 ResourceMark rm(THREAD);
1046 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1047 }
1048
1049 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
1050 obj = JNIHandles::make_local(THREAD, i);
1051 va_list args;
1052 va_start(args, methodID);
1053 JavaValue jvalue(T_VOID);
1054 JNI_ArgumentPusherVaArg ap(methodID, args);
1055 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1056 va_end(args);
1057
1058 return obj;
1059 JNI_END
1060
1061
1062 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1063 HOTSPOT_JNI_GETOBJECTCLASS_ENTRY(env, obj);
1064
1065 Klass* k = JNIHandles::resolve_non_null(obj)->klass();
1066 jclass ret =
1067 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1068
1069 HOTSPOT_JNI_GETOBJECTCLASS_RETURN(ret);
1070 return ret;
1071 JNI_END
1072
1073 JNI_ENTRY_NO_PRESERVE(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1074 HOTSPOT_JNI_ISINSTANCEOF_ENTRY(env, obj, clazz);
1075
1076 jboolean ret = JNI_TRUE;
1077 if (obj != nullptr) {
1788 // table. If they're not there, the field doesn't exist.
1789 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1790 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1791 if (fieldname == nullptr || signame == nullptr) {
1792 ResourceMark rm;
1793 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1794 }
1795
1796 // Make sure class is initialized before handing id's out to fields
1797 k->initialize(CHECK_NULL);
1798
1799 fieldDescriptor fd;
1800 if (!k->is_instance_klass() ||
1801 !InstanceKlass::cast(k)->find_field(fieldname, signame, false, &fd)) {
1802 ResourceMark rm;
1803 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1804 }
1805
1806 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1807 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1808 ret = jfieldIDWorkaround::to_instance_jfieldID(k, fd.offset(), fd.is_flat());
1809 return ret;
1810 JNI_END
1811
1812
1813 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1814 HOTSPOT_JNI_GETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID);
1815 oop o = JNIHandles::resolve_non_null(obj);
1816 Klass* k = o->klass();
1817 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1818 oop res = nullptr;
1819 // Keep JVMTI addition small and only check enabled flag here.
1820 // jni_GetField_probe() assumes that is okay to create handles.
1821 if (JvmtiExport::should_post_field_access()) {
1822 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1823 }
1824 if (!jfieldIDWorkaround::is_flat_jfieldID(fieldID)) {
1825 res = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(o, offset);
1826 } else {
1827 assert(k->is_instance_klass(), "Only instance can have flat fields");
1828 InstanceKlass* ik = InstanceKlass::cast(k);
1829 fieldDescriptor fd;
1830 bool found = ik->find_field_from_offset(offset, false, &fd); // performance bottleneck
1831 assert(found, "Field not found");
1832 InstanceKlass* holder = fd.field_holder();
1833 assert(holder->field_is_flat(fd.index()), "Must be");
1834 InlineLayoutInfo* li = holder->inline_layout_info_adr(fd.index());
1835 InlineKlass* field_vklass = li->klass();
1836 res = field_vklass->read_payload_from_addr(o, ik->field_offset(fd.index()), li->kind(), CHECK_NULL);
1837 }
1838 jobject ret = JNIHandles::make_local(THREAD, res);
1839 HOTSPOT_JNI_GETOBJECTFIELD_RETURN(ret);
1840 return ret;
1841 JNI_END
1842
1843 #define DEFINE_GETFIELD(Return,Fieldname,Result \
1844 , EntryProbe, ReturnProbe) \
1845 \
1846 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return \
1847 , ReturnProbe); \
1848 \
1849 JNI_ENTRY_NO_PRESERVE(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1850 \
1851 EntryProbe; \
1852 Return ret = 0;\
1853 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1854 \
1855 oop o = JNIHandles::resolve_non_null(obj); \
1856 Klass* k = o->klass(); \
1857 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1858 /* Keep JVMTI addition small and only check enabled flag here. */ \
1859 if (JvmtiExport::should_post_field_access()) { \
1860 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); \
1861 } \
1862 ret = o->Fieldname##_field(offset); \
1908 return (address)jni_GetLongField;
1909 }
1910 address jni_GetFloatField_addr() {
1911 return (address)jni_GetFloatField;
1912 }
1913 address jni_GetDoubleField_addr() {
1914 return (address)jni_GetDoubleField;
1915 }
1916
1917 JNI_ENTRY_NO_PRESERVE(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1918 HOTSPOT_JNI_SETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID, value);
1919 oop o = JNIHandles::resolve_non_null(obj);
1920 Klass* k = o->klass();
1921 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1922 // Keep JVMTI addition small and only check enabled flag here.
1923 if (JvmtiExport::should_post_field_modification()) {
1924 jvalue field_value;
1925 field_value.l = value;
1926 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, JVM_SIGNATURE_CLASS, (jvalue *)&field_value);
1927 }
1928 if (!jfieldIDWorkaround::is_flat_jfieldID(fieldID)) {
1929 oop v = JNIHandles::resolve(value);
1930 if (v == nullptr) {
1931 InstanceKlass *ik = InstanceKlass::cast(k);
1932 fieldDescriptor fd;
1933 ik->find_field_from_offset(offset, false, &fd);
1934 if (fd.is_null_free_inline_type()) {
1935 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Cannot store null in a null-restricted field");
1936 }
1937 }
1938 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(o, offset, v);
1939 } else {
1940 assert(k->is_instance_klass(), "Only instances can have flat fields");
1941 InstanceKlass* ik = InstanceKlass::cast(k);
1942 fieldDescriptor fd;
1943 ik->find_field_from_offset(offset, false, &fd);
1944 InstanceKlass* holder = fd.field_holder();
1945 InlineLayoutInfo* li = holder->inline_layout_info_adr(fd.index());
1946 InlineKlass* vklass = li->klass();
1947 oop v = JNIHandles::resolve(value);
1948 vklass->write_value_to_addr(v, ((char*)(oopDesc*)o) + offset, li->kind(), true, CHECK);
1949 }
1950 HOTSPOT_JNI_SETOBJECTFIELD_RETURN();
1951 JNI_END
1952
1953 // TODO: make this a template
1954
1955 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType \
1956 , EntryProbe, ReturnProbe) \
1957 \
1958 JNI_ENTRY_NO_PRESERVE(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1959 \
1960 EntryProbe; \
1961 \
1962 oop o = JNIHandles::resolve_non_null(obj); \
1963 Klass* k = o->klass(); \
1964 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1965 /* Keep JVMTI addition small and only check enabled flag here. */ \
1966 if (JvmtiExport::should_post_field_modification()) { \
1967 jvalue field_value; \
1968 field_value.unionType = value; \
1969 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
2358
2359 oop initial_value = JNIHandles::resolve(initialElement);
2360 if (initial_value != nullptr) { // array already initialized with null
2361 for (int index = 0; index < length; index++) {
2362 result->obj_at_put(index, initial_value);
2363 }
2364 }
2365 ret = (jobjectArray) JNIHandles::make_local(THREAD, result);
2366 return ret;
2367 JNI_END
2368
2369 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject
2370 , HOTSPOT_JNI_GETOBJECTARRAYELEMENT_RETURN(_ret_ref));
2371
2372 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2373 HOTSPOT_JNI_GETOBJECTARRAYELEMENT_ENTRY(env, array, index);
2374 jobject ret = nullptr;
2375 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2376 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2377 if (a->is_within_bounds(index)) {
2378 oop res = a->obj_at(index, CHECK_NULL);
2379 assert(res != nullptr || !a->is_null_free_array(), "Invalid value");
2380 ret = JNIHandles::make_local(THREAD, res);
2381 return ret;
2382 } else {
2383 ResourceMark rm(THREAD);
2384 stringStream ss;
2385 ss.print("Index %d out of bounds for length %d", index, a->length());
2386 THROW_MSG_NULL(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2387 }
2388 JNI_END
2389
2390 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement
2391 , HOTSPOT_JNI_SETOBJECTARRAYELEMENT_RETURN());
2392
2393 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2394 HOTSPOT_JNI_SETOBJECTARRAYELEMENT_ENTRY(env, array, index, value);
2395 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2396
2397 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2398 oop v = JNIHandles::resolve(value);
2399 if (a->is_within_bounds(index)) {
2400 Klass* ek = a->is_flatArray() ? FlatArrayKlass::cast(a->klass())->element_klass() : RefArrayKlass::cast(a->klass())->element_klass();
2401 if (v == nullptr || v->is_a(ek)) {
2402 a->obj_at_put(index, v, CHECK);
2403 } else {
2404 ResourceMark rm(THREAD);
2405 stringStream ss;
2406 Klass *bottom_kl = ObjArrayKlass::cast(a->klass())->bottom_klass();
2407 ss.print("type mismatch: can not store %s to %s[%d]",
2408 v->klass()->external_name(),
2409 bottom_kl->is_typeArray_klass() ? type2name_tab[ArrayKlass::cast(bottom_kl)->element_type()] : bottom_kl->external_name(),
2410 index);
2411 for (int dims = ArrayKlass::cast(a->klass())->dimension(); dims > 1; --dims) {
2412 ss.print("[]");
2413 }
2414 THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
2415 }
2416 } else {
2417 ResourceMark rm(THREAD);
2418 stringStream ss;
2419 ss.print("Index %d out of bounds for length %d", index, a->length());
2420 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2421 }
2422 JNI_END
2423
2424
2425
2426 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result \
2427 ,EntryProbe,ReturnProbe) \
2428 \
2429 DT_RETURN_MARK_DECL(New##Result##Array, Return \
2430 , ReturnProbe); \
2431 \
2432 JNI_ENTRY(Return, \
2433 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2434 EntryProbe; \
2435 Return ret = nullptr;\
2436 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2437 \
2438 oop obj= oopFactory::Allocator(len, CHECK_NULL); \
2439 ret = (Return) JNIHandles::make_local(THREAD, obj); \
2440 return ret;\
2441 JNI_END
2777 JNI_END
2778
2779 //
2780 // Monitor functions
2781 //
2782
2783 DT_RETURN_MARK_DECL(MonitorEnter, jint
2784 , HOTSPOT_JNI_MONITORENTER_RETURN(_ret_ref));
2785
2786 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2787 HOTSPOT_JNI_MONITORENTER_ENTRY(env, jobj);
2788 jint ret = JNI_ERR;
2789 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2790
2791 // If the object is null, we can't do anything with it
2792 if (jobj == nullptr) {
2793 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2794 }
2795
2796 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2797 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2798 return JNI_OK;
2799 JNI_END
2800
2801 DT_RETURN_MARK_DECL(MonitorExit, jint
2802 , HOTSPOT_JNI_MONITOREXIT_RETURN(_ret_ref));
2803
2804 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2805 HOTSPOT_JNI_MONITOREXIT_ENTRY(env, jobj);
2806 jint ret = JNI_ERR;
2807 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2808
2809 // Don't do anything with a null object
2810 if (jobj == nullptr) {
2811 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2812 }
2813
2814 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2815 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2816 return JNI_OK;
2817 JNI_END
|