172 assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
173 address base = Universe::narrow_oop_base();
174 int shift = Universe::narrow_oop_shift();
175 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
176 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
177 uint64_t result = pd >> shift;
178 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
179 assert(decode_heap_oop(result) == v, "reversibility");
180 return (narrowOop)result;
181 }
182
183 inline narrowOop oopDesc::encode_heap_oop(oop v) {
184 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);
185 }
186
187 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {
188 assert(!is_null(v), "narrow oop value can never be zero");
189 address base = Universe::narrow_oop_base();
190 int shift = Universe::narrow_oop_shift();
191 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
192 assert(check_obj_alignment(result), err_msg("address not aligned: " INTPTR_FORMAT, p2i((void*) result)));
193 return result;
194 }
195
196 inline oop oopDesc::decode_heap_oop(narrowOop v) {
197 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);
198 }
199
200 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }
201 inline oop oopDesc::decode_heap_oop(oop v) { return v; }
202
203 // Load an oop out of the Java heap as is without decoding.
204 // Called by GC to check for null before decoding.
205 inline oop oopDesc::load_heap_oop(oop* p) { return *p; }
206 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; }
207
208 // Load and decode an oop out of the Java heap into a wide oop.
209 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; }
210 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) {
211 return decode_heap_oop_not_null(*p);
212 }
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172 assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
173 address base = Universe::narrow_oop_base();
174 int shift = Universe::narrow_oop_shift();
175 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
176 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
177 uint64_t result = pd >> shift;
178 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
179 assert(decode_heap_oop(result) == v, "reversibility");
180 return (narrowOop)result;
181 }
182
183 inline narrowOop oopDesc::encode_heap_oop(oop v) {
184 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);
185 }
186
187 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {
188 assert(!is_null(v), "narrow oop value can never be zero");
189 address base = Universe::narrow_oop_base();
190 int shift = Universe::narrow_oop_shift();
191 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
192 assert(check_obj_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result));
193 return result;
194 }
195
196 inline oop oopDesc::decode_heap_oop(narrowOop v) {
197 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);
198 }
199
200 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }
201 inline oop oopDesc::decode_heap_oop(oop v) { return v; }
202
203 // Load an oop out of the Java heap as is without decoding.
204 // Called by GC to check for null before decoding.
205 inline oop oopDesc::load_heap_oop(oop* p) { return *p; }
206 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; }
207
208 // Load and decode an oop out of the Java heap into a wide oop.
209 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; }
210 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) {
211 return decode_heap_oop_not_null(*p);
212 }
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