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), err_msg("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
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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
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