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8016556: G1: Use ArrayAllocator for BitMaps

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Reviewed-by: tschatzl, dholmes, coleenp, johnc
This commit is contained in:
Bengt Rutisson 2013-06-18 22:45:32 +02:00
parent 5382e0759e
commit 3cc79df807
3 changed files with 19 additions and 8 deletions
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14
hotspot/src/share/vm/memory/allocation.hpp
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@ -713,13 +713,21 @@ public:
// is set so that we always use malloc except for Solaris where we set the
// limit to get mapped memory.
template <class E, MEMFLAGS F>
class ArrayAllocator : StackObj {
class ArrayAllocator VALUE_OBJ_CLASS_SPEC {
char* _addr;
bool _use_malloc;
size_t _size;
bool _free_in_destructor;
public:
ArrayAllocator() : _addr(NULL), _use_malloc(false), _size(0) { }
~ArrayAllocator() { free(); }
ArrayAllocator(bool free_in_destructor = true) :
_addr(NULL), _use_malloc(false), _size(0), _free_in_destructor(free_in_destructor) { }
~ArrayAllocator() {
if (_free_in_destructor) {
free();
}
}
E* allocate(size_t length);
void free();
};

10
hotspot/src/share/vm/utilities/bitMap.cpp
View File

@ -41,7 +41,7 @@
BitMap::BitMap(bm_word_t* map, idx_t size_in_bits) :
_map(map), _size(size_in_bits)
_map(map), _size(size_in_bits), _map_allocator(false)
{
assert(sizeof(bm_word_t) == BytesPerWord, "Implementation assumption.");
assert(size_in_bits >= 0, "just checking");
@ -49,7 +49,7 @@ BitMap::BitMap(bm_word_t* map, idx_t size_in_bits) :
BitMap::BitMap(idx_t size_in_bits, bool in_resource_area) :
_map(NULL), _size(0)
_map(NULL), _size(0), _map_allocator(false)
{
assert(sizeof(bm_word_t) == BytesPerWord, "Implementation assumption.");
resize(size_in_bits, in_resource_area);
@ -65,8 +65,10 @@ void BitMap::resize(idx_t size_in_bits, bool in_resource_area) {
if (in_resource_area) {
_map = NEW_RESOURCE_ARRAY(bm_word_t, new_size_in_words);
} else {
if (old_map != NULL) FREE_C_HEAP_ARRAY(bm_word_t, _map, mtInternal);
_map = NEW_C_HEAP_ARRAY(bm_word_t, new_size_in_words, mtInternal);
if (old_map != NULL) {
_map_allocator.free();
}
_map = _map_allocator.allocate(new_size_in_words);
}
Copy::disjoint_words((HeapWord*)old_map, (HeapWord*) _map,
MIN2(old_size_in_words, new_size_in_words));

3
hotspot/src/share/vm/utilities/bitMap.hpp
View File

@ -48,6 +48,7 @@ class BitMap VALUE_OBJ_CLASS_SPEC {
} RangeSizeHint;
private:
ArrayAllocator<bm_word_t, mtInternal> _map_allocator;
bm_word_t* _map; // First word in bitmap
idx_t _size; // Size of bitmap (in bits)
@ -113,7 +114,7 @@ class BitMap VALUE_OBJ_CLASS_SPEC {
public:
// Constructs a bitmap with no map, and size 0.
BitMap() : _map(NULL), _size(0) {}
BitMap() : _map(NULL), _size(0), _map_allocator(false) {}
// Constructs a bitmap with the given map and size.
BitMap(bm_word_t* map, idx_t size_in_bits);