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0N/A
1879N/A#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP
1879N/A#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP
1879N/A
1879N/A#include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp"
1879N/A#include "gc_implementation/parallelScavenge/asPSOldGen.hpp"
1879N/A#include "gc_implementation/parallelScavenge/asPSYoungGen.hpp"
1879N/A#include "gc_implementation/parallelScavenge/psPermGen.hpp"
1879N/A
0N/A
0N/A// Contains two generations that both use an AdjoiningVirtualSpaces.
0N/A// The two generations are adjacent in the reserved space for the
0N/A// heap. Each generation has a virtual space and shrinking and
0N/A// expanding of the generations can still be down with that
0N/A// virtual space as was previously done. If expanding of reserved
0N/A// size of a generation is required, the adjacent generation
0N/A// must be shrunk. Adjusting the boundary between the generations
0N/A// is called for in this class.
0N/A
3863N/Aclass AdjoiningGenerations : public CHeapObj<mtGC> {
0N/A friend class VMStructs;
0N/A private:
0N/A // The young generation and old generation, respectively
0N/A PSYoungGen* _young_gen;
0N/A PSOldGen* _old_gen;
0N/A
0N/A // The spaces used by the two generations.
0N/A AdjoiningVirtualSpaces _virtual_spaces;
0N/A
0N/A // Move boundary up to expand old gen. Checks are made to
0N/A // determine if the move can be done with specified limits.
0N/A void request_old_gen_expansion(size_t desired_change_in_bytes);
0N/A // Move boundary down to expand young gen.
0N/A bool request_young_gen_expansion(size_t desired_change_in_bytes);
0N/A
0N/A public:
0N/A AdjoiningGenerations(ReservedSpace rs,
0N/A size_t init_low_byte_size,
0N/A size_t min_low_byte_size,
0N/A size_t max_low_byte_size,
0N/A size_t init_high_byte_size,
0N/A size_t min_high_byte_size,
0N/A size_t max_high_bytes_size,
0N/A size_t alignment);
0N/A
0N/A // Accessors
0N/A PSYoungGen* young_gen() { return _young_gen; }
0N/A PSOldGen* old_gen() { return _old_gen; }
0N/A
0N/A AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; }
0N/A
0N/A // Additional space is needed in the old generation. Check
0N/A // the available space and attempt to move the boundary if more space
0N/A // is needed. The growth is not guaranteed to occur.
0N/A void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes);
0N/A // Similary for a growth of the young generation.
0N/A void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size);
0N/A
0N/A // Return the total byte size of the reserved space
0N/A // for the adjoining generations.
0N/A size_t reserved_byte_size();
0N/A};
1879N/A
1879N/A#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP