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comparison src/share/vm/oops/markOop.hpp @ 342:37f87013dfd8

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6711316: Open source the Garbage-First garbage collector Summary: First mercurial integration of the code for the Garbage-First garbage collector. Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author ysr
date Thu, 05 Jun 2008 15:57:56 -0700
parents ba764ed4b6f2
children 6aae2f9d0294
comparison
equal deleted inserted replaced
189:0b27f3512f9e 342:37f87013dfd8
214 // other thread. (They should spin or block instead. The 0 value 214 // other thread. (They should spin or block instead. The 0 value
215 // is transient and *should* be short-lived). 215 // is transient and *should* be short-lived).
216 static markOop INFLATING() { return (markOop) 0; } // inflate-in-progress 216 static markOop INFLATING() { return (markOop) 0; } // inflate-in-progress
217 217
218 // Should this header be preserved during GC? 218 // Should this header be preserved during GC?
219 bool must_be_preserved(oop obj_containing_mark) const { 219 inline bool must_be_preserved(oop obj_containing_mark) const;
220 if (!UseBiasedLocking)
221 return (!is_unlocked() || !has_no_hash());
222 return must_be_preserved_with_bias(obj_containing_mark);
223 }
224 inline bool must_be_preserved_with_bias(oop obj_containing_mark) const; 220 inline bool must_be_preserved_with_bias(oop obj_containing_mark) const;
225 221
226 // Should this header (including its age bits) be preserved in the 222 // Should this header (including its age bits) be preserved in the
227 // case of a promotion failure during scavenge? 223 // case of a promotion failure during scavenge?
228 // Note that we special case this situation. We want to avoid 224 // Note that we special case this situation. We want to avoid
238 // place in which to call them in any of the scavengers (although 234 // place in which to call them in any of the scavengers (although
239 // guarded by appropriate locks we could make one), but the 235 // guarded by appropriate locks we could make one), but the
240 // observation is that promotion failures are quite rare and 236 // observation is that promotion failures are quite rare and
241 // reducing the number of mark words preserved during them isn't a 237 // reducing the number of mark words preserved during them isn't a
242 // high priority. 238 // high priority.
243 bool must_be_preserved_for_promotion_failure(oop obj_containing_mark) const { 239 inline bool must_be_preserved_for_promotion_failure(oop obj_containing_mark) const;
244 if (!UseBiasedLocking)
245 return (this != prototype());
246 return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark);
247 }
248 inline bool must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const; 240 inline bool must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const;
249 241
250 // Should this header be preserved during a scavenge where CMS is 242 // Should this header be preserved during a scavenge where CMS is
251 // the old generation? 243 // the old generation?
252 // (This is basically the same body as must_be_preserved_for_promotion_failure(), 244 // (This is basically the same body as must_be_preserved_for_promotion_failure(),
253 // but takes the klassOop as argument instead) 245 // but takes the klassOop as argument instead)
254 bool must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const { 246 inline bool must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const;
255 if (!UseBiasedLocking)
256 return (this != prototype());
257 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
258 }
259 inline bool must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const; 247 inline bool must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const;
260 248
261 // WARNING: The following routines are used EXCLUSIVELY by 249 // WARNING: The following routines are used EXCLUSIVELY by
262 // synchronization functions. They are not really gc safe. 250 // synchronization functions. They are not really gc safe.
263 // They must get updated if markOop layout get changed. 251 // They must get updated if markOop layout get changed.