34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/modules.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmClasses.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "compiler/compiler_globals.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "gc/shared/stringdedup/stringDedup.hpp"
43 #include "interpreter/linkResolver.hpp"
44 #include "jni.h"
45 #include "jvm.h"
46 #include "logging/log.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "nmt/memTracker.hpp"
52 #include "oops/access.inline.hpp"
53 #include "oops/arrayOop.hpp"
54 #include "oops/instanceKlass.inline.hpp"
55 #include "oops/instanceOop.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/markWord.hpp"
58 #include "oops/method.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "oops/typeArrayKlass.hpp"
64 #include "oops/typeArrayOop.inline.hpp"
65 #include "prims/jniCheck.hpp"
66 #include "prims/jniExport.hpp"
67 #include "prims/jniFastGetField.hpp"
68 #include "prims/jvm_misc.hpp"
69 #include "prims/jvmtiExport.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/atomicAccess.hpp"
73 #include "runtime/fieldDescriptor.inline.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/interfaceSupport.inline.hpp"
76 #include "runtime/java.hpp"
77 #include "runtime/javaCalls.hpp"
78 #include "runtime/javaThread.inline.hpp"
79 #include "runtime/jfieldIDWorkaround.hpp"
80 #include "runtime/jniHandles.inline.hpp"
81 #include "runtime/reflection.hpp"
82 #include "runtime/safepointVerifiers.hpp"
83 #include "runtime/sharedRuntime.hpp"
84 #include "runtime/signature.hpp"
401 int modifiers = java_lang_reflect_Field::modifiers(reflected);
402
403 // Make sure class is initialized before handing id's out to fields
404 k1->initialize(CHECK_NULL);
405
406 // First check if this is a static field
407 if (modifiers & JVM_ACC_STATIC) {
408 int offset = InstanceKlass::cast(k1)->field_offset( slot );
409 JNIid* id = InstanceKlass::cast(k1)->jni_id_for(offset);
410 assert(id != nullptr, "corrupt Field object");
411 DEBUG_ONLY(id->set_is_static_field_id();)
412 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the Klass*
413 ret = jfieldIDWorkaround::to_static_jfieldID(id);
414 return ret;
415 }
416
417 // The slot is the index of the field description in the field-array
418 // The jfieldID is the offset of the field within the object
419 // It may also have hash bits for k, if VerifyJNIFields is turned on.
420 int offset = InstanceKlass::cast(k1)->field_offset( slot );
421 assert(InstanceKlass::cast(k1)->contains_field_offset(offset), "stay within object");
422 ret = jfieldIDWorkaround::to_instance_jfieldID(k1, offset);
423 return ret;
424 JNI_END
425
426
427 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject
428 , HOTSPOT_JNI_TOREFLECTEDMETHOD_RETURN(_ret_ref));
429
430 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
431 HOTSPOT_JNI_TOREFLECTEDMETHOD_ENTRY(env, cls, (uintptr_t) method_id, isStatic);
432
433 jobject ret = nullptr;
434 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
435
436 methodHandle m (THREAD, Method::resolve_jmethod_id(method_id));
437 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
438 oop reflection_method;
439 if (m->is_object_initializer()) {
440 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
441 } else {
442 // Note: Static initializers can theoretically be here, if JNI users manage
443 // to get their jmethodID. Record them as plain methods.
444 reflection_method = Reflection::new_method(m, false, CHECK_NULL);
445 }
446 ret = JNIHandles::make_local(THREAD, reflection_method);
447 return ret;
448 JNI_END
449
450 DT_RETURN_MARK_DECL(GetSuperclass, jclass
451 , HOTSPOT_JNI_GETSUPERCLASS_RETURN(_ret_ref));
452
453 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
454 HOTSPOT_JNI_GETSUPERCLASS_ENTRY(env, sub);
455
456 jclass obj = nullptr;
457 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
458
459 oop mirror = JNIHandles::resolve_non_null(sub);
778 }
779
780 friend class SignatureIterator; // so do_parameters_on can call do_type
781 void do_type(BasicType type) {
782 switch (type) {
783 // these are coerced to int when using va_arg
784 case T_BYTE:
785 case T_CHAR:
786 case T_SHORT:
787 case T_INT: push_int(va_arg(_ap, jint)); break;
788 case T_BOOLEAN: push_boolean((jboolean) va_arg(_ap, jint)); break;
789
790 // each of these paths is exercised by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
791
792 case T_LONG: push_long(va_arg(_ap, jlong)); break;
793 // float is coerced to double w/ va_arg
794 case T_FLOAT: push_float((jfloat) va_arg(_ap, jdouble)); break;
795 case T_DOUBLE: push_double(va_arg(_ap, jdouble)); break;
796
797 case T_ARRAY:
798 case T_OBJECT: push_object(va_arg(_ap, jobject)); break;
799 default: ShouldNotReachHere();
800 }
801 }
802
803 public:
804 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
805 : JNI_ArgumentPusher(Method::resolve_jmethod_id(method_id)) {
806 set_ap(rap);
807 }
808
809 ~JNI_ArgumentPusherVaArg() {
810 va_end(_ap);
811 }
812
813 virtual void push_arguments_on(JavaCallArguments* arguments) {
814 _arguments = arguments;
815 do_parameters_on(this);
816 }
817 };
818
945 result->set_type(args->return_type());
946
947 // Invoke the method. Result is returned as oop.
948 JavaCalls::call(result, method, &java_args, CHECK);
949
950 // Convert result
951 if (is_reference_type(result->get_type())) {
952 result->set_jobject(JNIHandles::make_local(THREAD, result->get_oop()));
953 }
954 }
955
956 DT_RETURN_MARK_DECL(AllocObject, jobject
957 , HOTSPOT_JNI_ALLOCOBJECT_RETURN(_ret_ref));
958
959 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
960 HOTSPOT_JNI_ALLOCOBJECT_ENTRY(env, clazz);
961
962 jobject ret = nullptr;
963 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
964
965 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
966 ret = JNIHandles::make_local(THREAD, i);
967 return ret;
968 JNI_END
969
970 DT_RETURN_MARK_DECL(NewObjectA, jobject
971 , HOTSPOT_JNI_NEWOBJECTA_RETURN(_ret_ref));
972
973 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
974 HOTSPOT_JNI_NEWOBJECTA_ENTRY(env, clazz, (uintptr_t) methodID);
975
976 jobject obj = nullptr;
977 DT_RETURN_MARK(NewObjectA, jobject, (const jobject&)obj);
978
979 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
980 obj = JNIHandles::make_local(THREAD, i);
981 JavaValue jvalue(T_VOID);
982 JNI_ArgumentPusherArray ap(methodID, args);
983 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
984 return obj;
985 JNI_END
986
987
988 DT_RETURN_MARK_DECL(NewObjectV, jobject
989 , HOTSPOT_JNI_NEWOBJECTV_RETURN(_ret_ref));
990
991 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
992 HOTSPOT_JNI_NEWOBJECTV_ENTRY(env, clazz, (uintptr_t) methodID);
993
994 jobject obj = nullptr;
995 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
996
997 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
998 obj = JNIHandles::make_local(THREAD, i);
999 JavaValue jvalue(T_VOID);
1000 JNI_ArgumentPusherVaArg ap(methodID, args);
1001 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1002 return obj;
1003 JNI_END
1004
1005
1006 DT_RETURN_MARK_DECL(NewObject, jobject
1007 , HOTSPOT_JNI_NEWOBJECT_RETURN(_ret_ref));
1008
1009 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1010 HOTSPOT_JNI_NEWOBJECT_ENTRY(env, clazz, (uintptr_t) methodID);
1011
1012 jobject obj = nullptr;
1013 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1014
1015 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(clazz), CHECK_NULL);
1016 obj = JNIHandles::make_local(THREAD, i);
1017 va_list args;
1018 va_start(args, methodID);
1019 JavaValue jvalue(T_VOID);
1020 JNI_ArgumentPusherVaArg ap(methodID, args);
1021 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1022 va_end(args);
1023 return obj;
1024 JNI_END
1025
1026
1027 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1028 HOTSPOT_JNI_GETOBJECTCLASS_ENTRY(env, obj);
1029
1030 Klass* k = JNIHandles::resolve_non_null(obj)->klass();
1031 jclass ret =
1032 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1033
1034 HOTSPOT_JNI_GETOBJECTCLASS_RETURN(ret);
1035 return ret;
1036 JNI_END
1037
1038 JNI_ENTRY_NO_PRESERVE(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1039 HOTSPOT_JNI_ISINSTANCEOF_ENTRY(env, obj, clazz);
1040
1041 jboolean ret = JNI_TRUE;
1042 if (obj != nullptr) {
1753 // table. If they're not there, the field doesn't exist.
1754 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1755 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1756 if (fieldname == nullptr || signame == nullptr) {
1757 ResourceMark rm;
1758 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1759 }
1760
1761 // Make sure class is initialized before handing id's out to fields
1762 k->initialize(CHECK_NULL);
1763
1764 fieldDescriptor fd;
1765 if (!k->is_instance_klass() ||
1766 !InstanceKlass::cast(k)->find_field(fieldname, signame, false, &fd)) {
1767 ResourceMark rm;
1768 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1769 }
1770
1771 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1772 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1773 ret = jfieldIDWorkaround::to_instance_jfieldID(k, fd.offset());
1774 return ret;
1775 JNI_END
1776
1777
1778 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1779 HOTSPOT_JNI_GETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID);
1780 oop o = JNIHandles::resolve_non_null(obj);
1781 Klass* k = o->klass();
1782 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1783 // Keep JVMTI addition small and only check enabled flag here.
1784 // jni_GetField_probe() assumes that is okay to create handles.
1785 if (JvmtiExport::should_post_field_access()) {
1786 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1787 }
1788 oop loaded_obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(o, offset);
1789 jobject ret = JNIHandles::make_local(THREAD, loaded_obj);
1790 HOTSPOT_JNI_GETOBJECTFIELD_RETURN(ret);
1791 return ret;
1792 JNI_END
1793
1794
1795
1796 #define DEFINE_GETFIELD(Return,Fieldname,Result \
1797 , EntryProbe, ReturnProbe) \
1798 \
1799 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return \
1800 , ReturnProbe); \
1801 \
1802 JNI_ENTRY_NO_PRESERVE(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1803 \
1804 EntryProbe; \
1805 Return ret = 0;\
1806 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1807 \
1808 oop o = JNIHandles::resolve_non_null(obj); \
1809 Klass* k = o->klass(); \
1810 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1811 /* Keep JVMTI addition small and only check enabled flag here. */ \
1812 if (JvmtiExport::should_post_field_access()) { \
1813 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); \
1814 } \
1815 ret = o->Fieldname##_field(offset); \
1887 assert(found, "bad field offset");
1888 assert(!fd.is_static(), "static/instance mismatch");
1889 if (fd.is_final()) {
1890 ResourceMark rm(current);
1891 log_debug(jni)("%s mutated final instance field %s.%s", func_name, ik->external_name(), fd.name()->as_C_string());
1892 }
1893 }
1894 }
1895
1896 JNI_ENTRY_NO_PRESERVE(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1897 HOTSPOT_JNI_SETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID, value);
1898 oop o = JNIHandles::resolve_non_null(obj);
1899 Klass* k = o->klass();
1900 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1901 // Keep JVMTI addition small and only check enabled flag here.
1902 if (JvmtiExport::should_post_field_modification()) {
1903 jvalue field_value;
1904 field_value.l = value;
1905 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, JVM_SIGNATURE_CLASS, (jvalue *)&field_value);
1906 }
1907 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(o, offset, JNIHandles::resolve(value));
1908 log_debug_if_final_instance_field(thread, "SetObjectField", InstanceKlass::cast(k), offset);
1909 HOTSPOT_JNI_SETOBJECTFIELD_RETURN();
1910 JNI_END
1911
1912 // TODO: make this a template
1913
1914 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType \
1915 , EntryProbe, ReturnProbe) \
1916 \
1917 JNI_ENTRY_NO_PRESERVE(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1918 \
1919 EntryProbe; \
1920 \
1921 oop o = JNIHandles::resolve_non_null(obj); \
1922 Klass* k = o->klass(); \
1923 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1924 /* Keep JVMTI addition small and only check enabled flag here. */ \
1925 if (JvmtiExport::should_post_field_modification()) { \
1926 jvalue field_value; \
1927 field_value.unionType = value; \
2320
2321 oop initial_value = JNIHandles::resolve(initialElement);
2322 if (initial_value != nullptr) { // array already initialized with null
2323 for (int index = 0; index < length; index++) {
2324 result->obj_at_put(index, initial_value);
2325 }
2326 }
2327 ret = (jobjectArray) JNIHandles::make_local(THREAD, result);
2328 return ret;
2329 JNI_END
2330
2331 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject
2332 , HOTSPOT_JNI_GETOBJECTARRAYELEMENT_RETURN(_ret_ref));
2333
2334 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2335 HOTSPOT_JNI_GETOBJECTARRAYELEMENT_ENTRY(env, array, index);
2336 jobject ret = nullptr;
2337 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2338 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2339 if (a->is_within_bounds(index)) {
2340 ret = JNIHandles::make_local(THREAD, a->obj_at(index));
2341 return ret;
2342 } else {
2343 ResourceMark rm(THREAD);
2344 stringStream ss;
2345 ss.print("Index %d out of bounds for length %d", index, a->length());
2346 THROW_MSG_NULL(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2347 }
2348 JNI_END
2349
2350 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement
2351 , HOTSPOT_JNI_SETOBJECTARRAYELEMENT_RETURN());
2352
2353 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2354 HOTSPOT_JNI_SETOBJECTARRAYELEMENT_ENTRY(env, array, index, value);
2355 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2356
2357 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2358 oop v = JNIHandles::resolve(value);
2359 if (a->is_within_bounds(index)) {
2360 if (v == nullptr || v->is_a(ObjArrayKlass::cast(a->klass())->element_klass())) {
2361 a->obj_at_put(index, v);
2362 } else {
2363 ResourceMark rm(THREAD);
2364 stringStream ss;
2365 Klass *bottom_kl = ObjArrayKlass::cast(a->klass())->bottom_klass();
2366 ss.print("type mismatch: can not store %s to %s[%d]",
2367 v->klass()->external_name(),
2368 bottom_kl->is_typeArray_klass() ? type2name_tab[ArrayKlass::cast(bottom_kl)->element_type()] : bottom_kl->external_name(),
2369 index);
2370 for (int dims = ArrayKlass::cast(a->klass())->dimension(); dims > 1; --dims) {
2371 ss.print("[]");
2372 }
2373 THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
2374 }
2375 } else {
2376 ResourceMark rm(THREAD);
2377 stringStream ss;
2378 ss.print("Index %d out of bounds for length %d", index, a->length());
2379 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2380 }
2381 JNI_END
2382
2383
2384
2385 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result \
2386 ,EntryProbe,ReturnProbe) \
2387 \
2388 DT_RETURN_MARK_DECL(New##Result##Array, Return \
2389 , ReturnProbe); \
2390 \
2391 JNI_ENTRY(Return, \
2392 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2393 EntryProbe; \
2394 Return ret = nullptr;\
2395 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2396 \
2397 oop obj= oopFactory::Allocator(len, CHECK_NULL); \
2398 ret = (Return) JNIHandles::make_local(THREAD, obj); \
2399 return ret;\
2400 JNI_END
2736 JNI_END
2737
2738 //
2739 // Monitor functions
2740 //
2741
2742 DT_RETURN_MARK_DECL(MonitorEnter, jint
2743 , HOTSPOT_JNI_MONITORENTER_RETURN(_ret_ref));
2744
2745 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2746 HOTSPOT_JNI_MONITORENTER_ENTRY(env, jobj);
2747 jint ret = JNI_ERR;
2748 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2749
2750 // If the object is null, we can't do anything with it
2751 if (jobj == nullptr) {
2752 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2753 }
2754
2755 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2756 ObjectSynchronizer::jni_enter(obj, thread);
2757 return JNI_OK;
2758 JNI_END
2759
2760 DT_RETURN_MARK_DECL(MonitorExit, jint
2761 , HOTSPOT_JNI_MONITOREXIT_RETURN(_ret_ref));
2762
2763 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2764 HOTSPOT_JNI_MONITOREXIT_ENTRY(env, jobj);
2765 jint ret = JNI_ERR;
2766 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2767
2768 // Don't do anything with a null object
2769 if (jobj == nullptr) {
2770 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2771 }
2772
2773 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2774 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2775 return JNI_OK;
2776 JNI_END
|
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/modules.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmClasses.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "compiler/compiler_globals.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "gc/shared/stringdedup/stringDedup.hpp"
43 #include "interpreter/linkResolver.hpp"
44 #include "jni.h"
45 #include "jvm.h"
46 #include "logging/log.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "nmt/memTracker.hpp"
52 #include "oops/access.inline.hpp"
53 #include "oops/arrayOop.hpp"
54 #include "oops/flatArrayOop.inline.hpp"
55 #include "oops/inlineKlass.inline.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 "oops/valuePayload.inline.hpp"
68 #include "prims/jniCheck.hpp"
69 #include "prims/jniExport.hpp"
70 #include "prims/jniFastGetField.hpp"
71 #include "prims/jvm_misc.hpp"
72 #include "prims/jvmtiExport.hpp"
73 #include "prims/jvmtiThreadState.hpp"
74 #include "runtime/arguments.hpp"
75 #include "runtime/atomicAccess.hpp"
76 #include "runtime/fieldDescriptor.inline.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/interfaceSupport.inline.hpp"
79 #include "runtime/java.hpp"
80 #include "runtime/javaCalls.hpp"
81 #include "runtime/javaThread.inline.hpp"
82 #include "runtime/jfieldIDWorkaround.hpp"
83 #include "runtime/jniHandles.inline.hpp"
84 #include "runtime/reflection.hpp"
85 #include "runtime/safepointVerifiers.hpp"
86 #include "runtime/sharedRuntime.hpp"
87 #include "runtime/signature.hpp"
404 int modifiers = java_lang_reflect_Field::modifiers(reflected);
405
406 // Make sure class is initialized before handing id's out to fields
407 k1->initialize(CHECK_NULL);
408
409 // First check if this is a static field
410 if (modifiers & JVM_ACC_STATIC) {
411 int offset = InstanceKlass::cast(k1)->field_offset( slot );
412 JNIid* id = InstanceKlass::cast(k1)->jni_id_for(offset);
413 assert(id != nullptr, "corrupt Field object");
414 DEBUG_ONLY(id->set_is_static_field_id();)
415 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the Klass*
416 ret = jfieldIDWorkaround::to_static_jfieldID(id);
417 return ret;
418 }
419
420 // The slot is the index of the field description in the field-array
421 // The jfieldID is the offset of the field within the object
422 // It may also have hash bits for k, if VerifyJNIFields is turned on.
423 int offset = InstanceKlass::cast(k1)->field_offset( slot );
424 bool is_flat = InstanceKlass::cast(k1)->field_is_flat(slot);
425 assert(InstanceKlass::cast(k1)->contains_field_offset(offset), "stay within object");
426 ret = jfieldIDWorkaround::to_instance_jfieldID(k1, offset, is_flat);
427 return ret;
428 JNI_END
429
430
431 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject
432 , HOTSPOT_JNI_TOREFLECTEDMETHOD_RETURN(_ret_ref));
433
434 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
435 HOTSPOT_JNI_TOREFLECTEDMETHOD_ENTRY(env, cls, (uintptr_t) method_id, isStatic);
436
437 jobject ret = nullptr;
438 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
439
440 methodHandle m (THREAD, Method::resolve_jmethod_id(method_id));
441 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
442 oop reflection_method;
443 if (m->is_object_constructor()) {
444 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
445 } else {
446 // Note: Static initializers can theoretically be here, if JNI users manage
447 // to get their jmethodID. Record them as plain methods.
448 reflection_method = Reflection::new_method(m, false, CHECK_NULL);
449 }
450 ret = JNIHandles::make_local(THREAD, reflection_method);
451 return ret;
452 JNI_END
453
454 DT_RETURN_MARK_DECL(GetSuperclass, jclass
455 , HOTSPOT_JNI_GETSUPERCLASS_RETURN(_ret_ref));
456
457 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
458 HOTSPOT_JNI_GETSUPERCLASS_ENTRY(env, sub);
459
460 jclass obj = nullptr;
461 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
462
463 oop mirror = JNIHandles::resolve_non_null(sub);
782 }
783
784 friend class SignatureIterator; // so do_parameters_on can call do_type
785 void do_type(BasicType type) {
786 switch (type) {
787 // these are coerced to int when using va_arg
788 case T_BYTE:
789 case T_CHAR:
790 case T_SHORT:
791 case T_INT: push_int(va_arg(_ap, jint)); break;
792 case T_BOOLEAN: push_boolean((jboolean) va_arg(_ap, jint)); break;
793
794 // each of these paths is exercised by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
795
796 case T_LONG: push_long(va_arg(_ap, jlong)); break;
797 // float is coerced to double w/ va_arg
798 case T_FLOAT: push_float((jfloat) va_arg(_ap, jdouble)); break;
799 case T_DOUBLE: push_double(va_arg(_ap, jdouble)); break;
800
801 case T_ARRAY:
802 case T_OBJECT: push_object(va_arg(_ap, jobject)); break;
803 default: ShouldNotReachHere();
804 }
805 }
806
807 public:
808 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
809 : JNI_ArgumentPusher(Method::resolve_jmethod_id(method_id)) {
810 set_ap(rap);
811 }
812
813 ~JNI_ArgumentPusherVaArg() {
814 va_end(_ap);
815 }
816
817 virtual void push_arguments_on(JavaCallArguments* arguments) {
818 _arguments = arguments;
819 do_parameters_on(this);
820 }
821 };
822
949 result->set_type(args->return_type());
950
951 // Invoke the method. Result is returned as oop.
952 JavaCalls::call(result, method, &java_args, CHECK);
953
954 // Convert result
955 if (is_reference_type(result->get_type())) {
956 result->set_jobject(JNIHandles::make_local(THREAD, result->get_oop()));
957 }
958 }
959
960 DT_RETURN_MARK_DECL(AllocObject, jobject
961 , HOTSPOT_JNI_ALLOCOBJECT_RETURN(_ret_ref));
962
963 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
964 HOTSPOT_JNI_ALLOCOBJECT_ENTRY(env, clazz);
965
966 jobject ret = nullptr;
967 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
968
969 oop clazzoop = JNIHandles::resolve_non_null(clazz);
970 Klass* k = java_lang_Class::as_Klass(clazzoop);
971 if (k == nullptr || k->is_inline_klass()) {
972 ResourceMark rm(THREAD);
973 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
974 }
975 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
976 ret = JNIHandles::make_local(THREAD, i);
977 return ret;
978 JNI_END
979
980 DT_RETURN_MARK_DECL(NewObjectA, jobject
981 , HOTSPOT_JNI_NEWOBJECTA_RETURN(_ret_ref));
982
983 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
984 HOTSPOT_JNI_NEWOBJECTA_ENTRY(env, clazz, (uintptr_t) methodID);
985
986 jobject obj = nullptr;
987 DT_RETURN_MARK(NewObjectA, jobject, (const jobject&)obj);
988
989 oop clazzoop = JNIHandles::resolve_non_null(clazz);
990 Klass* k = java_lang_Class::as_Klass(clazzoop);
991 if (k == nullptr) {
992 ResourceMark rm(THREAD);
993 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
994 }
995
996 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
997 obj = JNIHandles::make_local(THREAD, i);
998 JavaValue jvalue(T_VOID);
999 JNI_ArgumentPusherArray ap(methodID, args);
1000 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1001
1002 return obj;
1003 JNI_END
1004
1005
1006 DT_RETURN_MARK_DECL(NewObjectV, jobject
1007 , HOTSPOT_JNI_NEWOBJECTV_RETURN(_ret_ref));
1008
1009 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1010 HOTSPOT_JNI_NEWOBJECTV_ENTRY(env, clazz, (uintptr_t) methodID);
1011
1012 jobject obj = nullptr;
1013 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1014
1015 oop clazzoop = JNIHandles::resolve_non_null(clazz);
1016 Klass* k = java_lang_Class::as_Klass(clazzoop);
1017 if (k == nullptr) {
1018 ResourceMark rm(THREAD);
1019 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1020 }
1021
1022 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
1023 obj = JNIHandles::make_local(THREAD, i);
1024 JavaValue jvalue(T_VOID);
1025 JNI_ArgumentPusherVaArg ap(methodID, args);
1026 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1027
1028 return obj;
1029 JNI_END
1030
1031
1032 DT_RETURN_MARK_DECL(NewObject, jobject
1033 , HOTSPOT_JNI_NEWOBJECT_RETURN(_ret_ref));
1034
1035 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1036 HOTSPOT_JNI_NEWOBJECT_ENTRY(env, clazz, (uintptr_t) methodID);
1037
1038 jobject obj = nullptr;
1039 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1040
1041 oop clazzoop = JNIHandles::resolve_non_null(clazz);
1042 Klass* k = java_lang_Class::as_Klass(clazzoop);
1043 if (k == nullptr) {
1044 ResourceMark rm(THREAD);
1045 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1046 }
1047
1048 instanceOop i = InstanceKlass::allocate_instance(clazzoop, CHECK_NULL);
1049 obj = JNIHandles::make_local(THREAD, i);
1050 va_list args;
1051 va_start(args, methodID);
1052 JavaValue jvalue(T_VOID);
1053 JNI_ArgumentPusherVaArg ap(methodID, args);
1054 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1055 va_end(args);
1056
1057 return obj;
1058 JNI_END
1059
1060
1061 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1062 HOTSPOT_JNI_GETOBJECTCLASS_ENTRY(env, obj);
1063
1064 Klass* k = JNIHandles::resolve_non_null(obj)->klass();
1065 jclass ret =
1066 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1067
1068 HOTSPOT_JNI_GETOBJECTCLASS_RETURN(ret);
1069 return ret;
1070 JNI_END
1071
1072 JNI_ENTRY_NO_PRESERVE(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1073 HOTSPOT_JNI_ISINSTANCEOF_ENTRY(env, obj, clazz);
1074
1075 jboolean ret = JNI_TRUE;
1076 if (obj != nullptr) {
1787 // table. If they're not there, the field doesn't exist.
1788 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1789 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1790 if (fieldname == nullptr || signame == nullptr) {
1791 ResourceMark rm;
1792 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1793 }
1794
1795 // Make sure class is initialized before handing id's out to fields
1796 k->initialize(CHECK_NULL);
1797
1798 fieldDescriptor fd;
1799 if (!k->is_instance_klass() ||
1800 !InstanceKlass::cast(k)->find_field(fieldname, signame, false, &fd)) {
1801 ResourceMark rm;
1802 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", k->external_name(), name, sig));
1803 }
1804
1805 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1806 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1807 ret = jfieldIDWorkaround::to_instance_jfieldID(k, fd.offset(), fd.is_flat());
1808 return ret;
1809 JNI_END
1810
1811
1812 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1813 HOTSPOT_JNI_GETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID);
1814 oop o = JNIHandles::resolve_non_null(obj);
1815 Klass* k = o->klass();
1816 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1817 oop res = nullptr;
1818 // Keep JVMTI addition small and only check enabled flag here.
1819 // jni_GetField_probe() assumes that is okay to create handles.
1820 if (JvmtiExport::should_post_field_access()) {
1821 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1822 }
1823 if (!jfieldIDWorkaround::is_flat_jfieldID(fieldID)) {
1824 res = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(o, offset);
1825 } else {
1826 InstanceKlass* ik = InstanceKlass::cast(k);
1827 fieldDescriptor fd;
1828 bool found = ik->find_field_from_offset(offset, false, &fd); // performance bottleneck
1829 assert(found, "Field not found");
1830 FlatFieldPayload payload(instanceOop(o), &fd);
1831 res = payload.read(CHECK_NULL);
1832 }
1833 jobject ret = JNIHandles::make_local(THREAD, res);
1834 HOTSPOT_JNI_GETOBJECTFIELD_RETURN(ret);
1835 return ret;
1836 JNI_END
1837
1838 #define DEFINE_GETFIELD(Return,Fieldname,Result \
1839 , EntryProbe, ReturnProbe) \
1840 \
1841 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return \
1842 , ReturnProbe); \
1843 \
1844 JNI_ENTRY_NO_PRESERVE(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1845 \
1846 EntryProbe; \
1847 Return ret = 0;\
1848 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1849 \
1850 oop o = JNIHandles::resolve_non_null(obj); \
1851 Klass* k = o->klass(); \
1852 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1853 /* Keep JVMTI addition small and only check enabled flag here. */ \
1854 if (JvmtiExport::should_post_field_access()) { \
1855 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); \
1856 } \
1857 ret = o->Fieldname##_field(offset); \
1929 assert(found, "bad field offset");
1930 assert(!fd.is_static(), "static/instance mismatch");
1931 if (fd.is_final()) {
1932 ResourceMark rm(current);
1933 log_debug(jni)("%s mutated final instance field %s.%s", func_name, ik->external_name(), fd.name()->as_C_string());
1934 }
1935 }
1936 }
1937
1938 JNI_ENTRY_NO_PRESERVE(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1939 HOTSPOT_JNI_SETOBJECTFIELD_ENTRY(env, obj, (uintptr_t) fieldID, value);
1940 oop o = JNIHandles::resolve_non_null(obj);
1941 Klass* k = o->klass();
1942 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1943 // Keep JVMTI addition small and only check enabled flag here.
1944 if (JvmtiExport::should_post_field_modification()) {
1945 jvalue field_value;
1946 field_value.l = value;
1947 o = JvmtiExport::jni_SetField_probe(thread, obj, o, k, fieldID, false, JVM_SIGNATURE_CLASS, (jvalue *)&field_value);
1948 }
1949 if (!jfieldIDWorkaround::is_flat_jfieldID(fieldID)) {
1950 oop v = JNIHandles::resolve(value);
1951 if (v == nullptr) {
1952 InstanceKlass *ik = InstanceKlass::cast(k);
1953 fieldDescriptor fd;
1954 ik->find_field_from_offset(offset, false, &fd);
1955 if (fd.is_null_free_inline_type()) {
1956 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Cannot store null in a null-restricted field");
1957 }
1958 }
1959 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(o, offset, v);
1960 } else {
1961 assert(k->is_instance_klass(), "Only instances can have flat fields");
1962 InstanceKlass* ik = InstanceKlass::cast(k);
1963 fieldDescriptor fd;
1964 ik->find_field_from_offset(offset, false, &fd);
1965 FlatFieldPayload payload(instanceOop(o), &fd);
1966 payload.write(inlineOop(JNIHandles::resolve(value)), CHECK);
1967 }
1968 log_debug_if_final_instance_field(thread, "SetObjectField", InstanceKlass::cast(k), offset);
1969 HOTSPOT_JNI_SETOBJECTFIELD_RETURN();
1970 JNI_END
1971
1972 // TODO: make this a template
1973
1974 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType \
1975 , EntryProbe, ReturnProbe) \
1976 \
1977 JNI_ENTRY_NO_PRESERVE(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1978 \
1979 EntryProbe; \
1980 \
1981 oop o = JNIHandles::resolve_non_null(obj); \
1982 Klass* k = o->klass(); \
1983 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1984 /* Keep JVMTI addition small and only check enabled flag here. */ \
1985 if (JvmtiExport::should_post_field_modification()) { \
1986 jvalue field_value; \
1987 field_value.unionType = value; \
2380
2381 oop initial_value = JNIHandles::resolve(initialElement);
2382 if (initial_value != nullptr) { // array already initialized with null
2383 for (int index = 0; index < length; index++) {
2384 result->obj_at_put(index, initial_value);
2385 }
2386 }
2387 ret = (jobjectArray) JNIHandles::make_local(THREAD, result);
2388 return ret;
2389 JNI_END
2390
2391 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject
2392 , HOTSPOT_JNI_GETOBJECTARRAYELEMENT_RETURN(_ret_ref));
2393
2394 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2395 HOTSPOT_JNI_GETOBJECTARRAYELEMENT_ENTRY(env, array, index);
2396 jobject ret = nullptr;
2397 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2398 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2399 if (a->is_within_bounds(index)) {
2400 oop res = a->obj_at(index, CHECK_NULL);
2401 assert(res != nullptr || !a->is_null_free_array(), "Invalid value");
2402 ret = JNIHandles::make_local(THREAD, res);
2403 return ret;
2404 } else {
2405 ResourceMark rm(THREAD);
2406 stringStream ss;
2407 ss.print("Index %d out of bounds for length %d", index, a->length());
2408 THROW_MSG_NULL(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2409 }
2410 JNI_END
2411
2412 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement
2413 , HOTSPOT_JNI_SETOBJECTARRAYELEMENT_RETURN());
2414
2415 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2416 HOTSPOT_JNI_SETOBJECTARRAYELEMENT_ENTRY(env, array, index, value);
2417 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2418
2419 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2420 oop v = JNIHandles::resolve(value);
2421 if (a->is_within_bounds(index)) {
2422 Klass* ek = a->is_flatArray() ? FlatArrayKlass::cast(a->klass())->element_klass() : RefArrayKlass::cast(a->klass())->element_klass();
2423 if (v == nullptr || v->is_a(ek)) {
2424 a->obj_at_put(index, v, CHECK);
2425 } else {
2426 ResourceMark rm(THREAD);
2427 stringStream ss;
2428 Klass *bottom_kl = ObjArrayKlass::cast(a->klass())->bottom_klass();
2429 ss.print("type mismatch: can not store %s to %s[%d]",
2430 v->klass()->external_name(),
2431 bottom_kl->is_typeArray_klass() ? type2name_tab[ArrayKlass::cast(bottom_kl)->element_type()] : bottom_kl->external_name(),
2432 index);
2433 for (int dims = ArrayKlass::cast(a->klass())->dimension(); dims > 1; --dims) {
2434 ss.print("[]");
2435 }
2436 THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
2437 }
2438 } else {
2439 ResourceMark rm(THREAD);
2440 stringStream ss;
2441 ss.print("Index %d out of bounds for length %d", index, a->length());
2442 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
2443 }
2444 JNI_END
2445
2446
2447
2448 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result \
2449 ,EntryProbe,ReturnProbe) \
2450 \
2451 DT_RETURN_MARK_DECL(New##Result##Array, Return \
2452 , ReturnProbe); \
2453 \
2454 JNI_ENTRY(Return, \
2455 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2456 EntryProbe; \
2457 Return ret = nullptr;\
2458 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2459 \
2460 oop obj= oopFactory::Allocator(len, CHECK_NULL); \
2461 ret = (Return) JNIHandles::make_local(THREAD, obj); \
2462 return ret;\
2463 JNI_END
2799 JNI_END
2800
2801 //
2802 // Monitor functions
2803 //
2804
2805 DT_RETURN_MARK_DECL(MonitorEnter, jint
2806 , HOTSPOT_JNI_MONITORENTER_RETURN(_ret_ref));
2807
2808 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2809 HOTSPOT_JNI_MONITORENTER_ENTRY(env, jobj);
2810 jint ret = JNI_ERR;
2811 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2812
2813 // If the object is null, we can't do anything with it
2814 if (jobj == nullptr) {
2815 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2816 }
2817
2818 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2819 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2820 return JNI_OK;
2821 JNI_END
2822
2823 DT_RETURN_MARK_DECL(MonitorExit, jint
2824 , HOTSPOT_JNI_MONITOREXIT_RETURN(_ret_ref));
2825
2826 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2827 HOTSPOT_JNI_MONITOREXIT_ENTRY(env, jobj);
2828 jint ret = JNI_ERR;
2829 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2830
2831 // Don't do anything with a null object
2832 if (jobj == nullptr) {
2833 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2834 }
2835
2836 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2837 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2838 return JNI_OK;
2839 JNI_END
|