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add integer integration to theory_str::simplify_parent

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This commit is contained in:
Murphy Berzish 2016-07-31 16:51:35 -04:00
parent 41497f44c1
commit 9ceb2df28f
1 changed files with 43 additions and 45 deletions
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88
src/smt/theory_str.cpp
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@ -1564,6 +1564,14 @@ expr * theory_str::eval_concat(expr * n1, expr * n2) {
return NULL;
}
static inline std::string rational_to_string_if_exists(const rational & x, bool x_exists) {
if (x_exists) {
return x.to_string();
} else {
return "?";
}
}
/*
* The inputs:
* ~ nn: non const node
@ -1610,39 +1618,34 @@ void theory_str::simplify_parent(expr * nn, expr * eq_str) {
expr * arg0 = a_parent->get_arg(0);
expr * arg1 = a_parent->get_arg(1);
// TODO getLenValue()
// int parentLen = getLenValue(a_parent)
int parentLen = -1;
rational parentLen;
bool parentLen_exists = get_len_value(a_parent, parentLen);
if (arg0 == n_eq_enode->get_owner()) {
// TODO getLenValue()
// int arg0Len = getLenValue(eq_str);
// int arg1Len = getLenValue(arg1);
int arg0Len = -1;
int arg1Len = -1;
rational arg0Len, arg1Len;
bool arg0Len_exists = get_len_value(eq_str, arg0Len);
bool arg1Len_exists = get_len_value(arg1, arg1Len);
TRACE("t_str_detail",
tout << "simplify_parent #1:" << std::endl
<< "* parent = " << mk_ismt2_pp(a_parent, m) << std::endl
<< "* |parent| = " << parentLen << std::endl
<< "* |arg0| = " << arg0Len << std::endl
<< "* |arg1| = " << arg1Len << std::endl;
<< "* |parent| = " << rational_to_string_if_exists(parentLen, parentLen_exists) << std::endl
<< "* |arg0| = " << rational_to_string_if_exists(arg0Len, arg0Len_exists) << std::endl
<< "* |arg1| = " << rational_to_string_if_exists(arg1Len, arg1Len_exists) << std::endl;
);
if (parentLen != -1 && arg1Len == -1) {
// TODO after getLenValue() above
/*
Z3_ast implyL11 = mk_2_and(t, Z3_mk_eq(ctx, mk_length(t, parent), mk_int(ctx, parentLen)),
Z3_mk_eq(ctx, mk_length(t, arg0), mk_int(ctx, arg0Len)));
int makeUpLenArg1 = parentLen - arg0Len;
Z3_ast lenAss = NULL;
if (makeUpLenArg1 >= 0) {
Z3_ast implyR11 = Z3_mk_eq(ctx, mk_length(t, arg1), mk_int(ctx, makeUpLenArg1));
lenAss = Z3_mk_implies(ctx, implyL11, implyR11);
if (parentLen_exists && !arg1Len_exists) {
TRACE("t_str_detail", tout << "make up len for arg1" << std::endl;);
expr_ref implyL11(m.mk_and(ctx.mk_eq_atom(mk_strlen(a_parent), mk_int(parentLen)),
ctx.mk_eq_atom(mk_strlen(arg0), mk_int(arg0Len))), m);
rational makeUpLenArg1 = parentLen - arg0Len;
if (makeUpLenArg1.is_nonneg()) {
expr_ref implyR11(ctx.mk_eq_atom(mk_strlen(arg1), mk_int(makeUpLenArg1)), m);
assert_implication(implyL11, implyR11);
} else {
lenAss = Z3_mk_not(ctx, implyL11);
expr_ref neg(m.mk_not(implyL11), m);
assert_axiom(neg);
}
addAxiom(t, lenAss, __LINE__);
*/
}
// (Concat n_eqNode arg1) /\ arg1 has eq const
@ -1691,35 +1694,30 @@ void theory_str::simplify_parent(expr * nn, expr * eq_str) {
} // if (arg0 == n_eq_enode->get_owner())
if (arg1 == n_eq_enode->get_owner()) {
// TODO getLenValue()
// int arg0Len = getLenValue(arg0);
// int arg1Len = getLenValue(eq_str);
int arg0Len = -1;
int arg1Len = -1;
rational arg0Len, arg1Len;
bool arg0Len_exists = get_len_value(arg0, arg0Len);
bool arg1Len_exists = get_len_value(eq_str, arg1Len);
TRACE("t_str_detail",
tout << "simplify_parent #2:" << std::endl
<< "* parent = " << mk_ismt2_pp(a_parent, m) << std::endl
<< "* |parent| = " << parentLen << std::endl
<< "* |arg0| = " << arg0Len << std::endl
<< "* |arg1| = " << arg1Len << std::endl;
<< "* |parent| = " << rational_to_string_if_exists(parentLen, parentLen_exists) << std::endl
<< "* |arg0| = " << rational_to_string_if_exists(arg0Len, arg0Len_exists) << std::endl
<< "* |arg1| = " << rational_to_string_if_exists(arg1Len, arg1Len_exists) << std::endl;
);
if (parentLen != -1 && arg0Len == -1) {
// TODO after getLenValue() above
/*
Z3_ast implyL11 = mk_2_and(t, Z3_mk_eq(ctx, mk_length(t, parent), mk_int(ctx, parentLen)),
Z3_mk_eq(ctx, mk_length(t, arg1), mk_int(ctx, arg1Len)));
int makeUpLenArg0 = parentLen - arg1Len;
Z3_ast lenAss = NULL;
if (makeUpLenArg0 >= 0) {
Z3_ast implyR11 = Z3_mk_eq(ctx, mk_length(t, arg0), mk_int(ctx, makeUpLenArg0));
lenAss = Z3_mk_implies(ctx, implyL11, implyR11);
if (parentLen_exists && !arg0Len_exists) {
TRACE("t_str_detail", tout << "make up len for arg0" << std::endl;);
expr_ref implyL11(m.mk_and(ctx.mk_eq_atom(mk_strlen(a_parent), mk_int(parentLen)),
ctx.mk_eq_atom(mk_strlen(arg1), mk_int(arg1Len))), m);
rational makeUpLenArg0 = parentLen - arg1Len;
if (makeUpLenArg0.is_nonneg()) {
expr_ref implyR11(ctx.mk_eq_atom(mk_strlen(arg0), mk_int(makeUpLenArg0)), m);
assert_implication(implyL11, implyR11);
} else {
lenAss = Z3_mk_not(ctx, implyL11);
expr_ref neg(m.mk_not(implyL11), m);
assert_axiom(neg);
}
addAxiom(t, lenAss, __LINE__);
*/
}
// (Concat arg0 n_eqNode) /\ arg0 has eq const