55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
namespace factor {
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// gc_info should be kept in sync with:
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// basis/compiler/codegen/gc-maps/gc-maps.factor
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// basis/vm/vm.factor
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struct gc_info {
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uint32_t gc_root_count;
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uint32_t derived_root_count;
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uint32_t return_address_count;
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cell callsite_bitmap_size() {
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return gc_root_count;
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}
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cell total_bitmap_size() {
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return return_address_count * callsite_bitmap_size();
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}
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cell total_bitmap_bytes() { return ((total_bitmap_size() + 7) / 8); }
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uint32_t* return_addresses() {
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return (uint32_t*)this - return_address_count;
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}
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uint32_t* base_pointer_map() {
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return return_addresses() - return_address_count * derived_root_count;
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}
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uint8_t* gc_info_bitmap() {
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return (uint8_t*)base_pointer_map() - total_bitmap_bytes();
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}
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cell callsite_gc_roots(cell index) {
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return index * gc_root_count;
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}
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uint32_t lookup_base_pointer(cell index, cell derived_root) {
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return base_pointer_map()[index * derived_root_count + derived_root];
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}
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cell return_address_index(cell return_address) {
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uint32_t* return_address_array = return_addresses();
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for (cell i = 0; i < return_address_count; i++) {
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if (return_address == return_address_array[i])
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return i;
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}
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return (cell)-1;
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}
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};
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}
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