60 lines
1.5 KiB
C++
60 lines
1.5 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 scrub_d_count;
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uint32_t scrub_r_count;
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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 scrub_d_count + scrub_r_count + 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_scrub_d(cell index) {
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cell base = 0;
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return base + index * scrub_d_count;
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}
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cell callsite_scrub_r(cell index) {
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cell base = return_address_count * scrub_d_count;
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return base + index * scrub_r_count;
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}
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cell callsite_gc_roots(cell index) {
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cell base =
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return_address_count * scrub_d_count +
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return_address_count * scrub_r_count;
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return base + 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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};
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}
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