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comparison src/share/vm/prims/unsafe.cpp @ 9974:01dd93600d02

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Add comments in unsafe access of uncompressed pointers
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Mon, 10 Jun 2013 12:18:36 +0200
parents 4d5872186e76
children 836a62f43af9
comparison
equal deleted inserted replaced
9973:80cff15f7721 9974:01dd93600d02
186 } 186 }
187 #else 187 #else
188 #define GET_OOP_FIELD(obj, offset, v) \ 188 #define GET_OOP_FIELD(obj, offset, v) \
189 oop p = JNIHandles::resolve(obj); \ 189 oop p = JNIHandles::resolve(obj); \
190 oop v; \ 190 oop v; \
191 /* Uncompression is not performed to unsafeAccess with null object.
192 * This concerns accesses to the metaspace such as the classMirrorOffset which is not compressed.*/ \
191 if (UseCompressedOops && p!=NULL && offset>=oopDesc::header_size()) { \ 193 if (UseCompressedOops && p!=NULL && offset>=oopDesc::header_size()) { \
192 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 194 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
193 v = oopDesc::decode_heap_oop(n); \ 195 v = oopDesc::decode_heap_oop(n); \
194 } else { \ 196 } else { \
195 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 197 v = *(oop*)index_oop_from_field_offset_long(p, offset); \