91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
#include "master.hpp"
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namespace factor {
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struct to_aging_copier : no_fixup {
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aging_space* aging;
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tenured_space* tenured;
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to_aging_copier(aging_space* aging, tenured_space* tenured)
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: aging(aging), tenured(tenured) { }
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object* fixup_data(object* obj) {
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if (aging->contains_p(obj) || tenured->contains_p(obj)) {
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return obj;
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}
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// Is there another forwarding pointer?
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while (obj->forwarding_pointer_p()) {
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object* dest = obj->forwarding_pointer();
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obj = dest;
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}
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if (aging->contains_p(obj) || tenured->contains_p(obj)) {
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return obj;
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}
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cell size = obj->size();
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object* newpointer = aging->allot(size);
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if (!newpointer)
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throw must_start_gc_again();
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memcpy(newpointer, obj, size);
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obj->forward_to(newpointer);
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return newpointer;
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}
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};
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void factor_vm::collect_aging() {
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// Promote objects referenced from tenured space to tenured space, copy
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// everything else to the aging semi-space, and reset the nursery pointer.
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{
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// Change the op so that if we fail here, an assertion will be raised.
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current_gc->op = COLLECT_TO_TENURED_OP;
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slot_visitor<from_tenured_refs_copier>
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visitor(this, from_tenured_refs_copier(data->tenured, &mark_stack));
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gc_event* event = current_gc->event;
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if (event)
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event->reset_timer();
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visitor.visit_cards(data->tenured, card_points_to_aging, 0xff);
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if (event) {
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event->ended_phase(PHASE_CARD_SCAN);
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event->cards_scanned += visitor.cards_scanned;
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event->decks_scanned += visitor.decks_scanned;
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}
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if (event)
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event->reset_timer();
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visitor.visit_code_heap_roots(&code->points_to_aging);
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if (event) {
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event->ended_phase(PHASE_CODE_SCAN);
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event->code_blocks_scanned += code->points_to_aging.size();
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}
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visitor.visit_mark_stack(&mark_stack);
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}
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{
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// If collection fails here, do a to_tenured collection.
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current_gc->op = COLLECT_AGING_OP;
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std::swap(data->aging, data->aging_semispace);
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data->reset_aging();
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aging_space *aging = data->aging;
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slot_visitor<to_aging_copier>
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visitor(this, to_aging_copier(aging, data->tenured));
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cell scan = aging->start + aging->occupied_space();
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visitor.visit_all_roots();
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visitor.cheneys_algorithm(aging, scan);
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data->reset_nursery();
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code->clear_remembered_set();
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}
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}
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}
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