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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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43
src/tactic/core/elim_uncnstr_tactic.cpp
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@ -24,6 +24,7 @@ Notes:
#include "ast/recfun_decl_plugin.h"
#include "ast/array_decl_plugin.h"
#include "ast/datatype_decl_plugin.h"
#include "ast/seq_decl_plugin.h"
#include "tactic/core/collect_occs.h"
#include "ast/ast_smt2_pp.h"
#include "ast/ast_ll_pp.h"
@ -44,6 +45,7 @@ class elim_uncnstr_tactic : public tactic {
bv_util m_bv_util;
array_util m_ar_util;
datatype_util m_dt_util;
seq_util m_seq_util;
app_ref_vector m_fresh_vars;
obj_map<app, app*> m_cache;
app_ref_vector m_cache_domain;
@ -60,6 +62,7 @@ class elim_uncnstr_tactic : public tactic {
m_bv_util(m),
m_ar_util(m),
m_dt_util(m),
m_seq_util(m),
m_fresh_vars(m),
m_cache_domain(m),
m_max_memory(max_memory),
@ -792,6 +795,43 @@ class elim_uncnstr_tactic : public tactic {
}
return nullptr;
}
// x ++ y -> z, x -> z, y -> eps
app * process_seq_app(func_decl * f, unsigned num, expr * const * args) {
switch (f->get_decl_kind()) {
case _OP_STRING_CONCAT:
case OP_SEQ_CONCAT: {
app * r = nullptr;
expr* x, *y;
if (uncnstr(args[0]) && num == 2 &&
m_seq_util.str.is_concat(args[1], x, y) &&
uncnstr(x)) {
if (!mk_fresh_uncnstr_var_for(f, num, args, r))
return r;
if (m_mc) {
add_def(args[0], r);
add_def(x, m_seq_util.str.mk_empty(args[0]->get_sort()));
}
r = m_seq_util.str.mk_concat(r, y);
return r;
}
if (!uncnstr(num, args))
return nullptr;
if (!mk_fresh_uncnstr_var_for(f, num, args, r))
return r;
expr_ref id(m_seq_util.str.mk_empty(args[0]->get_sort()), m());
add_defs(num, args, r, id);
return r;
}
default:
return nullptr;
}
}
br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, proof_ref & result_pr) {
if (num == 0)
@ -817,7 +857,8 @@ class elim_uncnstr_tactic : public tactic {
u = process_array_app(f, num, args);
else if (fid == m_dt_util.get_family_id())
u = process_datatype_app(f, num, args);
else if (fid == m_seq_util.get_family_id())
u = process_seq_app(f, num, args);
if (u == nullptr)
return BR_FAILED;