193 assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
194 address base = Universe::narrow_oop_base();
195 int shift = Universe::narrow_oop_shift();
196 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
197 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
198 uint64_t result = pd >> shift;
199 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
200 assert(decode_heap_oop(result) == v, "reversibility");
201 return (narrowOop)result;
202 }
203
204 inline narrowOop oopDesc::encode_heap_oop(oop v) {
205 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);
206 }
207
208 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {
209 assert(!is_null(v), "narrow oop value can never be zero");
210 address base = Universe::narrow_oop_base();
211 int shift = Universe::narrow_oop_shift();
212 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
213 assert(check_obj_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result));
214 return result;
215 }
216
217 inline oop oopDesc::decode_heap_oop(narrowOop v) {
218 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);
219 }
220
221 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }
222 inline oop oopDesc::decode_heap_oop(oop v) { return v; }
223
224 // Load an oop out of the Java heap as is without decoding.
225 // Called by GC to check for null before decoding.
226 inline oop oopDesc::load_heap_oop(oop* p) { return *p; }
227 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; }
228
229 // Load and decode an oop out of the Java heap into a wide oop.
230 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; }
231 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) {
232 return decode_heap_oop_not_null(*p);
233 }
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193 assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
194 address base = Universe::narrow_oop_base();
195 int shift = Universe::narrow_oop_shift();
196 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
197 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
198 uint64_t result = pd >> shift;
199 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
200 assert(decode_heap_oop(result) == v, "reversibility");
201 return (narrowOop)result;
202 }
203
204 inline narrowOop oopDesc::encode_heap_oop(oop v) {
205 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);
206 }
207
208 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {
209 assert(!is_null(v), "narrow oop value can never be zero");
210 address base = Universe::narrow_oop_base();
211 int shift = Universe::narrow_oop_shift();
212 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
213 assert(check_obj_alignment(result), err_msg("address not aligned: " PTR_FORMAT, p2i((void*) result)));
214 return result;
215 }
216
217 inline oop oopDesc::decode_heap_oop(narrowOop v) {
218 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);
219 }
220
221 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }
222 inline oop oopDesc::decode_heap_oop(oop v) { return v; }
223
224 // Load an oop out of the Java heap as is without decoding.
225 // Called by GC to check for null before decoding.
226 inline oop oopDesc::load_heap_oop(oop* p) { return *p; }
227 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; }
228
229 // Load and decode an oop out of the Java heap into a wide oop.
230 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; }
231 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) {
232 return decode_heap_oop_not_null(*p);
233 }
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