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Compute parse state group signature based on the item set

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This commit is contained in:
Max Brunsfeld 2016-11-16 10:21:30 -08:00
parent 42d37656ea
commit 6cfd009503
5 changed files with 29 additions and 76 deletions
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25
src/compiler/build_tables/build_parse_table.cc
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@ -146,8 +146,8 @@ class ParseTableBuilder {
auto pair = parse_state_ids.find(item_set);
if (pair == parse_state_ids.end()) {
ParseStateId state_id = parse_table.add_state();
parse_state_ids[item_set] = state_id;
parse_table.states[state_id].shift_actions_signature = item_set.unfinished_item_signature();
item_sets_to_process.push_back({ std::move(item_set), state_id });
return state_id;
} else {
@ -176,9 +176,6 @@ class ParseTableBuilder {
parse_table.set_nonterminal_action(state_id, symbol.index, next_state);
}
}
ParseState &state = parse_table.states[state_id];
state.compute_shift_actions_signature();
}
void add_reduce_actions(const ParseItemSet &item_set, ParseStateId state_id) {
@ -285,26 +282,16 @@ class ParseTableBuilder {
for (ParseStateId i = 0, n = parse_table.states.size(); i < n; i++) {
ParseState &state = parse_table.states[i];
bool did_update_state = false;
if (state_replacements.count(i)) {
auto &old_group = state_indices_by_signature[state.shift_actions_signature];
old_group.erase(i);
state_indices_by_signature[state.shift_actions_signature].erase(i);
} else {
state.each_referenced_state([&state_replacements, &did_update_state](int64_t *state_index) {
auto new_replacement = state_replacements.find(*state_index);
if (new_replacement != state_replacements.end()) {
*state_index = new_replacement->second;
did_update_state = true;
state.each_referenced_state([&state_replacements](int64_t *state_index) {
auto replacement = state_replacements.find(*state_index);
if (replacement != state_replacements.end()) {
*state_index = replacement->second;
}
});
if (did_update_state) {
auto &old_group = state_indices_by_signature[state.shift_actions_signature];
old_group.erase(i);
state.compute_shift_actions_signature();
state_indices_by_signature[state.shift_actions_signature].insert(i);
}
}
}
}