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add unconstrained elimination for sequences

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This commit is contained in:
Nikolaj Bjorner 2023-03-14 09:23:13 +01:00
parent a0f3727e90
commit d1c7ff1a36
12 changed files with 148 additions and 16 deletions
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49
src/ast/converters/expr_inverter.cpp
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@ -19,6 +19,7 @@ Author:
#include "ast/ast_ll_pp.h"
#include "ast/ast_util.h"
#include "ast/arith_decl_plugin.h"
#include "ast/seq_decl_plugin.h"
#include "ast/converters/expr_inverter.h"
class basic_expr_inverter : public iexpr_inverter {
@ -742,6 +743,53 @@ public:
};
class seq_expr_inverter : public iexpr_inverter {
seq_util seq;
public:
seq_expr_inverter(ast_manager& m) : iexpr_inverter(m), seq(m) {}
family_id get_fid() const override { return seq.get_family_id(); }
bool operator()(func_decl* f, unsigned num, expr* const* args, expr_ref& r) override {
switch (f->get_decl_kind()) {
case _OP_STRING_CONCAT:
case OP_SEQ_CONCAT: {
expr* x, *y;
if (uncnstr(args[0]) && num == 2 &&
seq.str.is_concat(args[1], x, y) &&
uncnstr(x)) {
mk_fresh_uncnstr_var_for(f, r);
if (m_mc) {
add_def(args[0], seq.str.mk_empty(args[0]->get_sort()));
add_def(x, r);
}
r = seq.str.mk_concat(r, y);
return true;
}
if (!uncnstr(num, args))
return false;
mk_fresh_uncnstr_var_for(f, r);
if (m_mc) {
add_def(args[0], r);
for (unsigned i = 1; i < num; ++i)
add_def(args[i], seq.str.mk_empty(args[0]->get_sort()));
}
return true;
}
default:
return false;
}
}
bool mk_diff(expr* t, expr_ref& r) override {
return false;
}
};
expr_inverter::~expr_inverter() {
for (auto* v : m_inverters)
@ -796,6 +844,7 @@ expr_inverter::expr_inverter(ast_manager& m): iexpr_inverter(m) {
add(alloc(array_expr_inverter, m, *this));
add(alloc(dt_expr_inverter, m));
add(alloc(basic_expr_inverter, m, *this));
add(alloc(seq_expr_inverter, m));
}