88 // Return the address corresponding to the next marked bit at or after
89 // "addr", and before "limit", if "limit" is non-NULL. If there is no
90 // such bit, returns "limit" if that is non-NULL, or else "endWord()".
91 HeapWord* getNextMarkedWordAddress(HeapWord* addr,
92 HeapWord* limit = NULL) const;
93 // Return the address corresponding to the next unmarked bit at or after
94 // "addr", and before "limit", if "limit" is non-NULL. If there is no
95 // such bit, returns "limit" if that is non-NULL, or else "endWord()".
96 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr,
97 HeapWord* limit = NULL) const;
98
99 // conversion utilities
100 // XXX Fix these so that offsets are size_t's...
101 HeapWord* offsetToHeapWord(size_t offset) const {
102 return _bmStartWord + (offset << _shifter);
103 }
104 size_t heapWordToOffset(HeapWord* addr) const {
105 return pointer_delta(addr, _bmStartWord) >> _shifter;
106 }
107 int heapWordDiffToOffsetDiff(size_t diff) const;
108 HeapWord* nextWord(HeapWord* addr) {
109 return offsetToHeapWord(heapWordToOffset(addr) + 1);
110 }
111
112 // debugging
113 NOT_PRODUCT(bool covers(ReservedSpace rs) const;)
114 };
115
116 class CMBitMap : public CMBitMapRO {
117
118 public:
119 // constructor
120 CMBitMap(int shifter) :
121 CMBitMapRO(shifter) {}
122
123 // Allocates the back store for the marking bitmap
124 bool allocate(ReservedSpace heap_rs);
125
126 // write marks
127 void mark(HeapWord* addr) {
128 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
129 "outside underlying space?");
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88 // Return the address corresponding to the next marked bit at or after
89 // "addr", and before "limit", if "limit" is non-NULL. If there is no
90 // such bit, returns "limit" if that is non-NULL, or else "endWord()".
91 HeapWord* getNextMarkedWordAddress(HeapWord* addr,
92 HeapWord* limit = NULL) const;
93 // Return the address corresponding to the next unmarked bit at or after
94 // "addr", and before "limit", if "limit" is non-NULL. If there is no
95 // such bit, returns "limit" if that is non-NULL, or else "endWord()".
96 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr,
97 HeapWord* limit = NULL) const;
98
99 // conversion utilities
100 // XXX Fix these so that offsets are size_t's...
101 HeapWord* offsetToHeapWord(size_t offset) const {
102 return _bmStartWord + (offset << _shifter);
103 }
104 size_t heapWordToOffset(HeapWord* addr) const {
105 return pointer_delta(addr, _bmStartWord) >> _shifter;
106 }
107 int heapWordDiffToOffsetDiff(size_t diff) const;
108
109 HeapWord* nextObject(HeapWord* addr) {
110 oop obj = (oop) addr;
111 return addr + obj->size();
112 }
113
114 // debugging
115 NOT_PRODUCT(bool covers(ReservedSpace rs) const;)
116 };
117
118 class CMBitMap : public CMBitMapRO {
119
120 public:
121 // constructor
122 CMBitMap(int shifter) :
123 CMBitMapRO(shifter) {}
124
125 // Allocates the back store for the marking bitmap
126 bool allocate(ReservedSpace heap_rs);
127
128 // write marks
129 void mark(HeapWord* addr) {
130 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize),
131 "outside underlying space?");
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