8073052: Rename and clean up the allocation manager hierarchy in g1Allocator.?pp
Summary: Fix naming of G1ParGCAllocator, decrease dependencies between G1CollectedHeap, G1Allocator and G1AllocRegion, additional documentation.
Reviewed-by: mgerdin, jmasa, kbarrett
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#ifndef SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
#define SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP
#include "memory/allocation.hpp"
class CodeBlobClosure;
class CodeRootSetTable;
class HeapRegion;
class nmethod;
// Implements storage for a set of code roots.
// All methods that modify the set are not thread-safe except if otherwise noted.
class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
friend class G1CodeRootSetTest;
private:
const static size_t SmallSize = 32;
const static size_t Threshold = 24;
const static size_t LargeSize = 512;
CodeRootSetTable* _table;
CodeRootSetTable* load_acquire_table();
size_t _length;
void move_to_large();
void allocate_small_table();
public:
G1CodeRootSet() : _table(NULL), _length(0) {}
~G1CodeRootSet();
static void purge();
static size_t static_mem_size();
void add(nmethod* method);
bool remove(nmethod* method);
// Safe to call without synchronization, but may return false negatives.
bool contains(nmethod* method);
void clear();
void nmethods_do(CodeBlobClosure* blk) const;
// Remove all nmethods which no longer contain pointers into our "owner" region
void clean(HeapRegion* owner);
bool is_empty() {
bool empty = length() == 0;
assert(empty == (_table == NULL), "is empty only if table is deallocated");
return empty;
}
// Length in elements
size_t length() const { return _length; }
// Memory size in bytes taken by this set.
size_t mem_size();
};
#endif // SHARE_VM_GC_G1_G1CODECACHEREMSET_HPP