/vm/bump_allocator.hpp
http://github.com/abeaumont/factor · C++ Header · 54 lines · 44 code · 9 blank · 1 comment · 3 complexity · 31babdb11095c47f8fc9a58fa383870a MD5 · raw file
- namespace factor
- {
- template<typename Block> struct bump_allocator {
- /* offset of 'here' and 'end' is hardcoded in compiler backends */
- cell here;
- cell start;
- cell end;
- cell size;
- explicit bump_allocator(cell size_, cell start_) :
- here(start_), start(start_), end(start_ + size_), size(size_) {}
- bool contains_p(Block *block)
- {
- return ((cell)block - start) < size;
- }
- Block *allot(cell size)
- {
- cell h = here;
- here = h + align(size,data_alignment);
- return (Block *)h;
- }
- cell occupied_space()
- {
- return here - start;
- }
- cell free_space()
- {
- return end - here;
- }
- cell next_object_after(cell scan)
- {
- cell size = ((Block *)scan)->size();
- if(scan + size < here)
- return scan + size;
- else
- return 0;
- }
- cell first_object()
- {
- if(start != here)
- return start;
- else
- return 0;
- }
- };
- }