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comparison src/share/vm/utilities/hashtable.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 5e2dc722e70d
children a5d6f0c3585f
comparison
equal deleted inserted replaced
6724:36d1d483d5d6 6725:da91efe96a93
23 */ 23 */
24 24
25 #ifndef SHARE_VM_UTILITIES_HASHTABLE_HPP 25 #ifndef SHARE_VM_UTILITIES_HASHTABLE_HPP
26 #define SHARE_VM_UTILITIES_HASHTABLE_HPP 26 #define SHARE_VM_UTILITIES_HASHTABLE_HPP
27 27
28 #include "classfile/classLoaderData.hpp"
28 #include "memory/allocation.hpp" 29 #include "memory/allocation.hpp"
29 #include "oops/oop.hpp" 30 #include "oops/oop.hpp"
30 #include "oops/symbol.hpp" 31 #include "oops/symbol.hpp"
31 #include "runtime/handles.hpp" 32 #include "runtime/handles.hpp"
32 33
281 static bool use_alternate_hashcode() { return _seed != 0; } 282 static bool use_alternate_hashcode() { return _seed != 0; }
282 static jint seed() { return _seed; } 283 static jint seed() { return _seed; }
283 284
284 private: 285 private:
285 static jint _seed; 286 static jint _seed;
286
287 unsigned int new_hash(Symbol* s);
288 unsigned int new_hash(oop string);
289 }; 287 };
290 288
291 289
292 // Verions of hashtable where two handles are used to compute the index. 290 // Verions of hashtable where two handles are used to compute the index.
293 291
300 TwoOopHashtable(int table_size, int entry_size, HashtableBucket<F>* t, 298 TwoOopHashtable(int table_size, int entry_size, HashtableBucket<F>* t,
301 int number_of_entries) 299 int number_of_entries)
302 : Hashtable<T, F>(table_size, entry_size, t, number_of_entries) {} 300 : Hashtable<T, F>(table_size, entry_size, t, number_of_entries) {}
303 301
304 public: 302 public:
305 unsigned int compute_hash(Symbol* name, Handle loader) { 303 unsigned int compute_hash(Symbol* name, ClassLoaderData* loader_data) {
306 // Be careful with identity_hash(), it can safepoint and if this
307 // were one expression, the compiler could choose to unhandle each
308 // oop before calling identity_hash() for either of them. If the first
309 // causes a GC, the next would fail.
310 unsigned int name_hash = name->identity_hash(); 304 unsigned int name_hash = name->identity_hash();
311 unsigned int loader_hash = loader.is_null() ? 0 : loader->identity_hash(); 305 // loader is null with CDS
306 assert(loader_data != NULL || UseSharedSpaces || DumpSharedSpaces,
307 "only allowed with shared spaces");
308 unsigned int loader_hash = loader_data == NULL ? 0 : loader_data->identity_hash();
312 return name_hash ^ loader_hash; 309 return name_hash ^ loader_hash;
313 } 310 }
314 311
315 int index_for(Symbol* name, Handle loader) { 312 int index_for(Symbol* name, ClassLoaderData* loader_data) {
316 return this->hash_to_index(compute_hash(name, loader)); 313 return this->hash_to_index(compute_hash(name, loader_data));
317 } 314 }
318 }; 315 };
319 316
320 #endif // SHARE_VM_UTILITIES_HASHTABLE_HPP 317 #endif // SHARE_VM_UTILITIES_HASHTABLE_HPP