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set up model reconstruction trail

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This commit is contained in:
Nikolaj Bjorner 2022-11-04 11:25:05 -07:00
parent 84af521514
commit 28668c6efc
8 changed files with 130 additions and 44 deletions
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62
src/ast/simplifiers/model_reconstruction_trail.h
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@ -24,33 +24,62 @@ Author:
#pragma once
#include "util/scoped_ptr_vector.h"
#include "util/trail.h"
#include "ast/for_each_expr.h"
#include "ast/rewriter/expr_replacer.h"
#include "ast/simplifiers/dependent_expr.h"
#include "ast/converters/model_converter.h"
class model_reconstruction_trail {
ast_manager& m;
struct entry {
scoped_ptr<expr_replacer> m_replace;
scoped_ptr<expr_substitution> m_subst;
vector<dependent_expr> m_removed;
bool m_active = true;
entry(expr_replacer* r, expr_substitution* s, vector<dependent_expr> const& rem) :
m_replace(r), m_subst(s), m_removed(rem) {}
bool is_loose() const { return !m_removed.empty(); }
bool intersects(ast_mark const& free_vars) const {
return std::any_of(m_subst->sub().begin(), m_subst->sub().end(), [&](auto const& kv) { return free_vars.is_marked(kv.m_key); });
}
struct model_reconstruction_trail_entry {
scoped_ptr<expr_replacer> m_replace;
vector<dependent_expr> m_removed;
model_reconstruction_trail_entry(expr_replacer* r, vector<dependent_expr> const& rem) :
m_replace(r), m_removed(rem) {}
};
scoped_ptr_vector<model_reconstruction_trail_entry> m_trail;
unsigned_vector m_limit;
ast_manager& m;
trail_stack& m_trail_stack;
scoped_ptr_vector<entry> m_trail;
void add_vars(dependent_expr const& d, ast_mark& free_vars) {
for (expr* t : subterms::all(expr_ref(d.fml(), d.get_manager())))
free_vars.mark(t, true);
}
bool intersects(ast_mark const& free_vars, dependent_expr const& d) {
expr_ref term(d.fml(), d.get_manager());
auto iter = subterms::all(term);
return std::any_of(iter.begin(), iter.end(), [&](expr* t) { return free_vars.is_marked(t); });
}
bool intersects(ast_mark const& free_vars, vector<dependent_expr> const& added) {
return std::any_of(added.begin(), added.end(), [&](dependent_expr const& d) { return intersects(free_vars, d); });
}
public:
model_reconstruction_trail(ast_manager& m) : m(m) {}
model_reconstruction_trail(ast_manager& m, trail_stack& tr):
m(m), m_trail_stack(tr) {}
/**
* add a new substitution to the stack
*/
void push(expr_replacer* r, vector<dependent_expr> const& removed) {
m_trail.push_back(alloc(model_reconstruction_trail_entry, r, removed));
m_trail.push_back(alloc(entry, r, nullptr, removed));
m_trail_stack.push(push_back_vector(m_trail));
}
/**
@ -63,18 +92,5 @@ public:
* retrieve the current model converter corresponding to chaining substitutions from the trail.
*/
model_converter_ref get_model_converter();
/**
* push a context. Portions of the trail added within a context are removed after a context pop.
*/
void push() {
m_limit.push_back(m_trail.size());
}
void pop(unsigned n) {
unsigned old_sz = m_limit[m_limit.size() - n];
m_trail.resize(old_sz);
m_limit.shrink(m_limit.size() - n);
}
};