Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp @ 10185:d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime.
Reviewed-by: twisti, johnc
Contributed-by: Martin Doerr <martin.doerr@sap.com>
| author | johnc |
|---|---|
| date | Wed, 24 Apr 2013 14:48:43 -0700 |
| parents | da91efe96a93 |
| children | 8f07aa079343 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/asPSOldGen.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/asPSYoungGen.hpp" | |
| 31 | |
| 0 | 32 |
| 33 // Contains two generations that both use an AdjoiningVirtualSpaces. | |
| 34 // The two generations are adjacent in the reserved space for the | |
| 35 // heap. Each generation has a virtual space and shrinking and | |
| 36 // expanding of the generations can still be down with that | |
| 37 // virtual space as was previously done. If expanding of reserved | |
| 38 // size of a generation is required, the adjacent generation | |
| 39 // must be shrunk. Adjusting the boundary between the generations | |
| 40 // is called for in this class. | |
| 41 | |
| 6197 | 42 class AdjoiningGenerations : public CHeapObj<mtGC> { |
| 0 | 43 friend class VMStructs; |
| 44 private: | |
| 45 // The young generation and old generation, respectively | |
| 46 PSYoungGen* _young_gen; | |
| 47 PSOldGen* _old_gen; | |
| 48 | |
| 49 // The spaces used by the two generations. | |
| 50 AdjoiningVirtualSpaces _virtual_spaces; | |
| 51 | |
| 52 // Move boundary up to expand old gen. Checks are made to | |
| 53 // determine if the move can be done with specified limits. | |
| 54 void request_old_gen_expansion(size_t desired_change_in_bytes); | |
| 55 // Move boundary down to expand young gen. | |
| 56 bool request_young_gen_expansion(size_t desired_change_in_bytes); | |
| 57 | |
| 58 public: | |
| 59 AdjoiningGenerations(ReservedSpace rs, | |
| 60 size_t init_low_byte_size, | |
| 61 size_t min_low_byte_size, | |
| 62 size_t max_low_byte_size, | |
| 63 size_t init_high_byte_size, | |
| 64 size_t min_high_byte_size, | |
| 65 size_t max_high_bytes_size, | |
| 66 size_t alignment); | |
| 67 | |
| 68 // Accessors | |
| 69 PSYoungGen* young_gen() { return _young_gen; } | |
| 70 PSOldGen* old_gen() { return _old_gen; } | |
| 71 | |
| 72 AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } | |
| 73 | |
| 74 // Additional space is needed in the old generation. Check | |
| 75 // the available space and attempt to move the boundary if more space | |
| 76 // is needed. The growth is not guaranteed to occur. | |
| 77 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); | |
| 78 // Similary for a growth of the young generation. | |
| 79 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); | |
| 80 | |
| 81 // Return the total byte size of the reserved space | |
| 82 // for the adjoining generations. | |
| 83 size_t reserved_byte_size(); | |
| 84 }; | |
| 1972 | 85 |
| 86 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |