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fi #3023

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-15 22:00:36 -10:00
parent e9c4c23334
commit 19ba2948d1
1 changed files with 13 additions and 6 deletions
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19
src/tactic/arith/fix_dl_var_tactic.cpp
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@ -25,6 +25,7 @@ Revision History:
#include "ast/rewriter/th_rewriter.h"
#include "tactic/generic_model_converter.h"
#include "ast/arith_decl_plugin.h"
#include "ast/seq_decl_plugin.h"
#include "ast/expr_substitution.h"
#include "ast/ast_smt2_pp.h"
@ -34,6 +35,7 @@ class fix_dl_var_tactic : public tactic {
struct failed {};
ast_manager & m;
arith_util & m_util;
seq_util m_seq;
expr_fast_mark1 * m_visited;
ptr_vector<expr> m_todo;
obj_map<app, unsigned> m_occs;
@ -41,7 +43,8 @@ class fix_dl_var_tactic : public tactic {
is_target(arith_util & u):
m(u.get_manager()),
m_util(u) {
m_util(u),
m_seq(m) {
}
void throw_failed(expr * ctx1, expr * ctx2 = nullptr) {
@ -54,8 +57,12 @@ class fix_dl_var_tactic : public tactic {
return s->get_family_id() == m_util.get_family_id();
}
// Return true if n is uninterpreted with respect to arithmetic.
// sequence theory is not disjoint from arithmetic
bool is_uninterp(expr * n) {
return is_app(n) && to_app(n)->get_family_id() != m_util.get_family_id();
if (!is_app(n)) return false;
app* t = to_app(n);
family_id fid = t->get_family_id();
return fid != m_util.get_family_id() && fid != m_seq.get_family_id();
}
// Remark: we say an expression is nested, if it occurs inside the boolean structure of the formula.
@ -82,9 +89,9 @@ class fix_dl_var_tactic : public tactic {
}
void process_app(app * t) {
unsigned num = t->get_num_args();
for (unsigned i = 0; i < num; i++)
visit(t->get_arg(i), false);
for (expr * arg : *t) {
visit(arg, false);
}
}
void process_arith_atom(expr * lhs, expr * rhs, bool nested) {
@ -258,7 +265,7 @@ class fix_dl_var_tactic : public tactic {
app * var = is_target(u)(*g);
if (var != nullptr) {
IF_VERBOSE(TACTIC_VERBOSITY_LVL, verbose_stream() << "(fixing-at-zero " << var->get_decl()->get_name() << ")\n";);
tactic_report report("fix-dl-var", *g);
TRACE("fix_dl_var", tout << "target " << mk_ismt2_pp(var, m) << "\n";);
expr_substitution subst(m);
app * zero = u.mk_numeral(rational(0), u.is_int(var));