43 return (intptr_t)obj % KlassAlignmentInBytes == 0; 44 } 45 46 inline narrowKlass Klass::encode_klass_not_null(Klass* v) { 47 assert(!is_null(v), "klass value can never be zero"); 48 assert(check_klass_alignment(v), "Address not aligned"); 49 int shift = Universe::narrow_klass_shift(); 50 uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1)); 51 assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding"); 52 uint64_t result = pd >> shift; 53 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow"); 54 assert(decode_klass(result) == v, "reversibility"); 55 return (narrowKlass)result; 56 } 57 58 inline narrowKlass Klass::encode_klass(Klass* v) { 59 return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v); 60 } 61 62 inline Klass* Klass::decode_klass_not_null(narrowKlass v) { 63 assert(!is_null(v), "narrow klass value can never be zero"); 64 int shift = Universe::narrow_klass_shift(); 65 Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift)); 66 assert(check_klass_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result)); 67 return result; 68 } 69 70 inline Klass* Klass::decode_klass(narrowKlass v) { 71 return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v); 72 } 73 74 #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP | 43 return (intptr_t)obj % KlassAlignmentInBytes == 0; 44 } 45 46 inline narrowKlass Klass::encode_klass_not_null(Klass* v) { 47 assert(!is_null(v), "klass value can never be zero"); 48 assert(check_klass_alignment(v), "Address not aligned"); 49 int shift = Universe::narrow_klass_shift(); 50 uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1)); 51 assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding"); 52 uint64_t result = pd >> shift; 53 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow"); 54 assert(decode_klass(result) == v, "reversibility"); 55 return (narrowKlass)result; 56 } 57 58 inline narrowKlass Klass::encode_klass(Klass* v) { 59 return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v); 60 } 61 62 inline Klass* Klass::decode_klass_not_null(narrowKlass v) { 63 if (is_null(v)) 64 assert(!is_null(v), "narrow klass value can never be zero"); 65 assert(!is_null(v), "narrow klass value can never be zero"); 66 int shift = Universe::narrow_klass_shift(); 67 Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift)); 68 assert(check_klass_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result)); 69 return result; 70 } 71 72 inline Klass* Klass::decode_klass(narrowKlass v) { 73 return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v); 74 } 75 76 #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP |