Mercurial > hg > truffle
annotate src/share/vm/memory/memRegion.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| 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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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // A very simple data structure representing a contigous region | |
| 26 // region of address space. | |
| 27 | |
| 28 // Note that MemRegions are passed by value, not by reference. | |
| 29 // The intent is that they remain very small and contain no | |
| 30 // objects. | |
| 31 | |
| 32 class MemRegion VALUE_OBJ_CLASS_SPEC { | |
| 33 friend class VMStructs; | |
| 34 private: | |
| 35 HeapWord* _start; | |
| 36 size_t _word_size; | |
| 37 | |
| 38 public: | |
| 39 MemRegion() : _start(NULL), _word_size(0) {}; | |
| 40 MemRegion(HeapWord* start, size_t word_size) : | |
| 41 _start(start), _word_size(word_size) {}; | |
| 42 MemRegion(HeapWord* start, HeapWord* end) : | |
| 43 _start(start), _word_size(pointer_delta(end, start)) { | |
| 44 assert(end >= start, "incorrect constructor arguments"); | |
| 45 } | |
| 46 | |
| 47 MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} | |
| 48 | |
| 49 MemRegion intersection(const MemRegion mr2) const; | |
| 50 // regions must overlap or be adjacent | |
| 51 MemRegion _union(const MemRegion mr2) const; | |
| 52 // minus will fail a guarantee if mr2 is interior to this, | |
| 53 // since there's no way to return 2 disjoint regions. | |
| 54 MemRegion minus(const MemRegion mr2) const; | |
| 55 | |
| 56 HeapWord* start() const { return _start; } | |
| 57 HeapWord* end() const { return _start + _word_size; } | |
| 58 HeapWord* last() const { return _start + _word_size - 1; } | |
| 59 | |
| 60 void set_start(HeapWord* start) { _start = start; } | |
| 61 void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } | |
| 62 void set_word_size(size_t word_size) { | |
| 63 _word_size = word_size; | |
| 64 } | |
| 65 | |
| 66 bool contains(const MemRegion mr2) const { | |
| 67 return _start <= mr2._start && end() >= mr2.end(); | |
| 68 } | |
| 69 bool contains(const void* addr) const { | |
| 70 return addr >= (void*)_start && addr < (void*)end(); | |
| 71 } | |
| 72 bool equals(const MemRegion mr2) const { | |
| 73 // first disjunct since we do not have a canonical empty set | |
| 74 return ((is_empty() && mr2.is_empty()) || | |
| 75 (start() == mr2.start() && end() == mr2.end())); | |
| 76 } | |
| 77 | |
| 78 size_t byte_size() const { return _word_size * sizeof(HeapWord); } | |
| 79 size_t word_size() const { return _word_size; } | |
| 80 | |
| 81 bool is_empty() const { return word_size() == 0; } | |
| 82 }; | |
| 83 | |
| 84 // For iteration over MemRegion's. | |
| 85 | |
| 86 class MemRegionClosure : public StackObj { | |
| 87 public: | |
| 88 virtual void do_MemRegion(MemRegion mr) = 0; | |
| 89 }; | |
| 90 | |
| 91 // A ResourceObj version of MemRegionClosure | |
| 92 | |
| 93 class MemRegionClosureRO: public MemRegionClosure { | |
| 94 public: | |
| 95 void* operator new(size_t size, ResourceObj::allocation_type type) { | |
| 96 return ResourceObj::operator new(size, type); | |
| 97 } | |
| 98 void* operator new(size_t size, Arena *arena) { | |
| 99 return ResourceObj::operator new(size, arena); | |
| 100 } | |
| 101 void* operator new(size_t size) { | |
| 102 return ResourceObj::operator new(size); | |
| 103 } | |
| 104 | |
| 105 void operator delete(void* p) {} // nothing to do | |
| 106 }; |