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use datatype name instead of instantiation for cycle detection #5482

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This commit is contained in:
Nikolaj Bjorner 2021-08-24 11:14:41 -07:00
parent e90ec457c3
commit e5b6cd36f0
2 changed files with 9 additions and 6 deletions
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14
src/ast/datatype_decl_plugin.cpp
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@ -706,18 +706,20 @@ namespace datatype {
\brief Return true if the inductive datatype is recursive.
*/
bool util::is_recursive_core(sort* s) const {
obj_map<sort, status> already_found;
map<symbol, status, symbol_hash_proc, symbol_eq_proc> already_found;
ptr_vector<sort> todo, subsorts;
sort* s0 = s;
todo.push_back(s);
status st;
std::cout << "is recursive " << mk_pp(s, m) << "\n";
while (!todo.empty()) {
s = todo.back();
if (already_found.find(s, st) && st == BLACK) {
std::cout << "is recursive - todo " << mk_pp(s, m) << "\n";
if (already_found.find(datatype_name(s), st) && st == BLACK) {
todo.pop_back();
continue;
}
already_found.insert(s, GRAY);
already_found.insert(datatype_name(s), GRAY);
def const& d = get_def(s);
bool can_process = true;
for (constructor const* c : d) {
@ -728,9 +730,9 @@ namespace datatype {
get_subsorts(d, subsorts);
for (sort * s2 : subsorts) {
if (is_datatype(s2)) {
if (already_found.find(s2, st)) {
if (already_found.find(datatype_name(s2), st)) {
// type is recursive
if (st == GRAY && s0 == s2)
if (st == GRAY && datatype_name(s0) == datatype_name(s2))
return true;
}
else {
@ -742,7 +744,7 @@ namespace datatype {
}
}
if (can_process) {
already_found.insert(s, BLACK);
already_found.insert(datatype_name(s), BLACK);
todo.pop_back();
}
}

1
src/ast/datatype_decl_plugin.h
View file

@ -323,6 +323,7 @@ namespace datatype {
bool is_covariant(ast_mark& mark, ptr_vector<sort>& subsorts, sort* s) const;
def& get_def(symbol const& s) { return plugin().get_def(s); }
void get_subsorts(sort* s, ptr_vector<sort>& sorts) const;
symbol datatype_name(sort* s) const { return s->get_parameter(0).get_symbol(); }
public:
util(ast_manager & m);