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Implement finite_set_value_factory using array_util to create singleton sets

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2025-10-15 19:56:32 +00:00
parent 430deb511a
commit ea3dc7e217
2 changed files with 28 additions and 5 deletions
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31
src/model/finite_set_value_factory.cpp
View file

@ -12,9 +12,11 @@ Abstract:
--*/
#include "model/finite_set_value_factory.h"
#include "model/model_core.h"
#include "ast/array_decl_plugin.h"
finite_set_value_factory::finite_set_value_factory(ast_manager & m, family_id fid, model_core & md):
struct_factory(m, fid, md) {
struct_factory(m, fid, md),
m_util(m) {
}
expr * finite_set_value_factory::get_some_value(sort * s) {
@ -23,7 +25,12 @@ expr * finite_set_value_factory::get_some_value(sort * s) {
if (m_sort2value_set.find(s, set) && !set->empty())
return *(set->begin());
// TODO add handling here
// For sets, return an empty set
if (m_util.is_array(s)) {
expr * empty = m_util.mk_empty_set(s);
register_value(empty);
return empty;
}
return nullptr;
}
@ -36,9 +43,23 @@ expr * finite_set_value_factory::get_fresh_value(sort * s) {
if (set->empty())
return get_some_value(s);
// TODO add handling here: create a fresh value for the element sort.
// if it fails, then traverse set to add a new value to a set such that
// the new set hasn't been created before.
// For sets represented as arrays
if (m_util.is_array(s)) {
// Get the element sort (domain of the array)
sort * elem_sort = get_array_domain(s, 0);
// Try to get a fresh value from the element domain
expr * fresh_elem = m_model.get_fresh_value(elem_sort);
if (fresh_elem != nullptr) {
// Create a singleton set with the fresh element
// Start with an empty set and add the element
expr * empty = m_util.mk_empty_set(s);
expr * args[3] = { empty, fresh_elem, m_manager.mk_true() };
expr * singleton = m_util.mk_store(3, args);
register_value(singleton);
return singleton;
}
}
// For finite domains, we may not be able to generate fresh values
// if all values have been exhausted

2
src/model/finite_set_value_factory.h
View file

@ -13,11 +13,13 @@ Abstract:
#pragma once
#include "model/struct_factory.h"
#include "ast/array_decl_plugin.h"
/**
\brief Factory for finite set values.
*/
class finite_set_value_factory : public struct_factory {
array_util m_util;
public:
finite_set_value_factory(ast_manager & m, family_id fid, model_core & md);