87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
#include "master.hpp"
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/* A tool to debug write barriers. Call check_data_heap() to ensure that all
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cards that should be marked are actually marked. */
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namespace factor {
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enum generation {
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nursery_generation,
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aging_generation,
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tenured_generation
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};
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inline generation generation_of(factor_vm* parent, object* obj) {
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if (parent->data->nursery->contains_p(obj))
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return nursery_generation;
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else if (parent->data->aging->contains_p(obj))
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return aging_generation;
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else if (parent->data->tenured->contains_p(obj))
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return tenured_generation;
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else {
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critical_error("Bad object", (cell)obj);
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return (generation)-1;
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}
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}
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struct slot_checker {
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factor_vm* parent;
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object* obj;
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generation gen;
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slot_checker(factor_vm* parent, object* obj, generation gen)
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: parent(parent), obj(obj), gen(gen) {}
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void check_write_barrier(cell* slot_ptr, generation target, char mask) {
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cell object_card_pointer = parent->cards_offset + ((cell)obj >> card_bits);
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cell slot_card_pointer =
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parent->cards_offset + ((cell)slot_ptr >> card_bits);
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char slot_card_value = *(char*)slot_card_pointer;
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if ((slot_card_value & mask) != mask) {
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std::cout << "card not marked" << std::endl;
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std::cout << "source generation: " << gen << std::endl;
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std::cout << "target generation: " << target << std::endl;
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std::cout << "object: 0x" << std::hex << (cell)
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obj << std::dec << std::endl;
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std::cout << "object type: " << obj->type() << std::endl;
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std::cout << "slot pointer: 0x" << std::hex << (cell)
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slot_ptr << std::dec << std::endl;
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std::cout << "slot value: 0x" << std::hex << *slot_ptr << std::dec
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<< std::endl;
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std::cout << "card of object: 0x" << std::hex << object_card_pointer
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<< std::dec << std::endl;
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std::cout << "card of slot: 0x" << std::hex << slot_card_pointer
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<< std::dec << std::endl;
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std::cout << std::endl;
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parent->factorbug();
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}
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}
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void operator()(cell* slot_ptr) {
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if (immediate_p(*slot_ptr))
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return;
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generation target = generation_of(parent, untag<object>(*slot_ptr));
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if (gen == aging_generation && target == nursery_generation) {
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check_write_barrier(slot_ptr, target, card_points_to_nursery);
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} else if (gen == tenured_generation) {
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if (target == nursery_generation) {
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check_write_barrier(slot_ptr, target, card_points_to_nursery);
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} else if (target == aging_generation) {
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check_write_barrier(slot_ptr, target, card_points_to_aging);
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}
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}
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}
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};
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void factor_vm::check_data_heap() {
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auto checker = [&](object* obj){
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generation obj_gen = generation_of(this, obj);
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slot_checker s_checker(this, obj, obj_gen);
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obj->each_slot(s_checker);
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};
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each_object(checker);
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}
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}
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