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refactor solve_concat_eq_str to use expr_ref_vector

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This commit is contained in:
Murphy Berzish 2016-11-28 18:47:42 -05:00
parent b77f6666dc
commit f968f79d1c
1 changed files with 16 additions and 21 deletions
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37
src/smt/theory_str.cpp
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@ -5824,19 +5824,16 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
if (arg1 != a1 || arg2 != a2) {
TRACE("t_str", tout << "resolved concat argument(s) to eqc string constants" << std::endl;);
int iPos = 0;
app * item1[2];
expr_ref_vector item1(m);
if (a1 != arg1) {
item1[iPos++] = ctx.mk_eq_atom(a1, arg1);
item1.push_back(ctx.mk_eq_atom(a1, arg1));
iPos += 1;
}
if (a2 != arg2) {
item1[iPos++] = ctx.mk_eq_atom(a2, arg2);
}
expr_ref implyL1(m);
if (iPos == 1) {
implyL1 = item1[0];
} else {
implyL1 = m.mk_and(item1[0], item1[1]);
item1.push_back(ctx.mk_eq_atom(a2, arg2));
iPos += 1;
}
expr_ref implyL1(mk_and(item1), m);
newConcat = mk_concat(arg1, arg2);
if (newConcat != str) {
expr_ref implyR1(ctx.mk_eq_atom(concat, newConcat), m);
@ -6091,8 +6088,8 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
int xor_pos = 0;
int and_count = 1;
expr ** xor_items = alloc_svect(expr*, (concatStrLen+1));
expr ** and_items = alloc_svect(expr*, (4 * (concatStrLen+1) + 1));
expr_ref_vector xor_items(m);
expr_ref_vector and_items(m);
for (int i = 0; i < concatStrLen + 1; ++i) {
std::string prefixStr = const_str.substr(0, i);
@ -6105,15 +6102,18 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
continue;
}
expr_ref xorAst(ctx.mk_eq_atom(xorFlag, m_autil.mk_numeral(rational(xor_pos), true)), m);
xor_items[xor_pos++] = xorAst;
xor_items.push_back(xorAst);
xor_pos += 1;
expr_ref prefixAst(m_strutil.mk_string(prefixStr), m);
expr_ref arg1_eq (ctx.mk_eq_atom(arg1, prefixAst), m);
and_items[and_count++] = ctx.mk_eq_atom(xorAst, arg1_eq);
and_items.push_back(ctx.mk_eq_atom(xorAst, arg1_eq));
and_count += 1;
expr_ref suffixAst(m_strutil.mk_string(suffixStr), m);
expr_ref arg2_eq (ctx.mk_eq_atom(arg2, suffixAst), m);
and_items[and_count++] = ctx.mk_eq_atom(xorAst, arg2_eq);
and_items.push_back(ctx.mk_eq_atom(xorAst, arg2_eq));
and_count += 1;
}
expr_ref implyL(ctx.mk_eq_atom(concat, str), m);
@ -6124,13 +6124,8 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
expr_ref negate_ast(m.mk_not(concat_eq_str), m);
assert_axiom(negate_ast);
} else {
if (xor_pos == 1) {
and_items[0] = xor_items[0];
implyR1 = m.mk_and(and_count, and_items);
} else {
and_items[0] = m.mk_or(xor_pos, xor_items);
implyR1 = m.mk_and(and_count, and_items);
}
and_items.push_back(mk_or(xor_items));
implyR1 = mk_and(and_items);
assert_implication(implyL, implyR1);
}
} /* (arg1Len != 1 || arg2Len != 1) */