8227084: Add timing information for merge heap root preparation
Reviewed-by: sangheki, kbarrett
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
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* 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_GC_G1_G1CODEROOTSETTABLE_HPP
#define SHARE_GC_G1_G1CODEROOTSETTABLE_HPP
#include "utilities/hashtable.hpp"
class nmethod;
class G1CodeRootSetTable : public Hashtable<nmethod*, mtGC> {
friend class G1CodeRootSetTest;
typedef HashtableEntry<nmethod*, mtGC> Entry;
static G1CodeRootSetTable* volatile _purge_list;
G1CodeRootSetTable* _purge_next;
unsigned int compute_hash(nmethod* nm) {
uintptr_t hash = (uintptr_t)nm;
return hash ^ (hash >> 7); // code heap blocks are 128byte aligned
}
void remove_entry(Entry* e, Entry* previous);
Entry* new_entry(nmethod* nm);
public:
G1CodeRootSetTable(int size) : Hashtable<nmethod*, mtGC>(size, sizeof(Entry)), _purge_next(NULL) {}
~G1CodeRootSetTable();
// Needs to be protected by locks
bool add(nmethod* nm);
bool remove(nmethod* nm);
// Can be called without locking
bool contains(nmethod* nm);
int entry_size() const { return BasicHashtable<mtGC>::entry_size(); }
void copy_to(G1CodeRootSetTable* new_table);
void nmethods_do(CodeBlobClosure* blk);
template<typename CB>
int remove_if(CB& should_remove);
static void purge_list_append(G1CodeRootSetTable* tbl);
static void purge();
static size_t static_mem_size() {
return sizeof(_purge_list);
}
size_t mem_size();
};
#endif // SHARE_GC_G1_G1CODEROOTSETTABLE_HPP