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comparison src/share/vm/gc_interface/collectedHeap.inline.hpp @ 7176:59c790074993

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8003635: NPG: AsynchGetCallTrace broken by Method* virtual call Summary: Make metaspace::contains be lock free and used to see if something is in metaspace, also compare Method* with vtbl pointer. Reviewed-by: dholmes, sspitsyn, dcubed, jmasa
author coleenp
date Wed, 28 Nov 2012 17:50:21 -0500
parents da91efe96a93
children c24f778e9401
comparison
equal deleted inserted replaced
7175:b51dc8df86e5 7176:59c790074993
240 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs); 240 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs);
241 #endif 241 #endif
242 return (oop)obj; 242 return (oop)obj;
243 } 243 }
244 244
245 // Returns "TRUE" if "p" is a method oop in the
246 // current heap with high probability. NOTE: The main
247 // current consumers of this interface are Forte::
248 // and ThreadProfiler::. In these cases, the
249 // interpreter frame from which "p" came, may be
250 // under construction when sampled asynchronously, so
251 // the clients want to check that it represents a
252 // valid method before using it. Nonetheless since
253 // the clients do not typically lock out GC, the
254 // predicate is_valid_method() is not stable, so
255 // it is possible that by the time "p" is used, it
256 // is no longer valid.
257 inline bool CollectedHeap::is_valid_method(Method* p) const {
258 return
259 p != NULL &&
260
261 // Check whether "method" is metadata
262 p->is_metadata() &&
263
264 // See if GC is active; however, there is still an
265 // apparently unavoidable window after this call
266 // and before the client of this interface uses "p".
267 // If the client chooses not to lock out GC, then
268 // it's a risk the client must accept.
269 !is_gc_active() &&
270
271 // Check that p is a Method*.
272 p->is_method();
273 }
274
275 inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) { 245 inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) {
276 NoHeaderExtendedOopClosure no_header_cl(cl); 246 NoHeaderExtendedOopClosure no_header_cl(cl);
277 oop_iterate(&no_header_cl); 247 oop_iterate(&no_header_cl);
278 } 248 }
279 249