841 // than fields, this method MUST return zero for such arrays.
842 // For example, the VM used to store sub-word sized fields in full
843 // words in the object layout, so that accessors like getByte(Object,int)
844 // did not really do what one might expect for arrays. Therefore,
845 // this function used to report a zero scale factor, so that the user
846 // would know not to attempt to access sub-word array elements.
847 // // Code for unpacked fields:
848 // if (scale < wordSize) return 0;
849
850 // The following allows for a pretty general fieldOffset cookie scheme,
851 // but requires it to be linear in byte offset.
852 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
853 UNSAFE_END
854
855
856 static inline void throw_new(JNIEnv *env, const char *ename) {
857 char buf[100];
858 strcpy(buf, "java/lang/");
859 strcat(buf, ename);
860 jclass cls = env->FindClass(buf);
861 char* msg = NULL;
862 env->ThrowNew(cls, msg);
863 }
864
865 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
866 {
867 // Code lifted from JDK 1.3 ClassLoader.c
868
869 jbyte *body;
870 char *utfName;
871 jclass result = 0;
872 char buf[128];
873
874 if (UsePerfData) {
875 ClassLoader::unsafe_defineClassCallCounter()->inc();
876 }
877
878 if (data == NULL) {
879 throw_new(env, "NullPointerException");
880 return 0;
|
841 // than fields, this method MUST return zero for such arrays.
842 // For example, the VM used to store sub-word sized fields in full
843 // words in the object layout, so that accessors like getByte(Object,int)
844 // did not really do what one might expect for arrays. Therefore,
845 // this function used to report a zero scale factor, so that the user
846 // would know not to attempt to access sub-word array elements.
847 // // Code for unpacked fields:
848 // if (scale < wordSize) return 0;
849
850 // The following allows for a pretty general fieldOffset cookie scheme,
851 // but requires it to be linear in byte offset.
852 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
853 UNSAFE_END
854
855
856 static inline void throw_new(JNIEnv *env, const char *ename) {
857 char buf[100];
858 strcpy(buf, "java/lang/");
859 strcat(buf, ename);
860 jclass cls = env->FindClass(buf);
861 if (env->ExceptionCheck()) {
862 env->ExceptionClear();
863 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
864 return;
865 }
866 char* msg = NULL;
867 env->ThrowNew(cls, msg);
868 }
869
870 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
871 {
872 // Code lifted from JDK 1.3 ClassLoader.c
873
874 jbyte *body;
875 char *utfName;
876 jclass result = 0;
877 char buf[128];
878
879 if (UsePerfData) {
880 ClassLoader::unsafe_defineClassCallCounter()->inc();
881 }
882
883 if (data == NULL) {
884 throw_new(env, "NullPointerException");
885 return 0;
|