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revert local changes to theory_str

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-08-20 09:14:08 -07:00
parent ff734d6aa9
commit 9fe9587a9b
1 changed files with 103 additions and 7 deletions
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110
src/smt/theory_str.cpp
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@ -166,18 +166,14 @@ namespace smt {
}
}
void theory_str::assert_axiom(expr * _e) {
void theory_str::assert_axiom(expr * e) {
if (opt_VerifyFinalCheckProgress) {
finalCheckProgressIndicator = true;
}
if (get_manager().is_true(_e)) return;
if (get_manager().is_true(e)) return;
TRACE("str", tout << "asserting " << mk_ismt2_pp(e, get_manager()) << std::endl;);
context & ctx = get_context();
ast_manager& m = get_manager();
TRACE("str", tout << "asserting " << mk_ismt2_pp(_e, m) << std::endl;);
expr_ref e(_e, m);
th_rewriter rw(m);
rw(e);
if (!ctx.b_internalized(e)) {
ctx.internalize(e, false);
}
@ -189,6 +185,7 @@ namespace smt {
m_trail.push_back(e);
//TRACE("str", tout << "done asserting " << mk_ismt2_pp(e, get_manager()) << std::endl;);
}
expr * theory_str::rewrite_implication(expr * premise, expr * conclusion) {
@ -1420,6 +1417,104 @@ namespace smt {
assert_axiom(finalAxiom);
}
void theory_str::instantiate_axiom_Substr(enode * e) {
context & ctx = get_context();
ast_manager & m = get_manager();
app * expr = e->get_owner();
if (axiomatized_terms.contains(expr)) {
TRACE("str", tout << "already set up Substr axiom for " << mk_pp(expr, m) << std::endl;);
return;
}
axiomatized_terms.insert(expr);
TRACE("str", tout << "instantiate Substr axiom for " << mk_pp(expr, m) << std::endl;);
expr_ref substrBase(expr->get_arg(0), m);
expr_ref substrPos(expr->get_arg(1), m);
expr_ref substrLen(expr->get_arg(2), m);
SASSERT(substrBase);
SASSERT(substrPos);
SASSERT(substrLen);
expr_ref zero(m_autil.mk_numeral(rational::zero(), true), m);
expr_ref minusOne(m_autil.mk_numeral(rational::minus_one(), true), m);
SASSERT(zero);
SASSERT(minusOne);
expr_ref_vector argumentsValid_terms(m);
// pos >= 0
argumentsValid_terms.push_back(m_autil.mk_ge(substrPos, zero));
// pos < strlen(base)
// --> pos + -1*strlen(base) < 0
argumentsValid_terms.push_back(m.mk_not(m_autil.mk_ge(
m_autil.mk_add(substrPos, m_autil.mk_mul(minusOne, substrLen)),
zero)));
// len >= 0
argumentsValid_terms.push_back(m_autil.mk_ge(substrLen, zero));
expr_ref argumentsValid(mk_and(argumentsValid_terms), m);
SASSERT(argumentsValid);
ctx.internalize(argumentsValid, false);
// (pos+len) >= strlen(base)
// --> pos + len + -1*strlen(base) >= 0
expr_ref lenOutOfBounds(m_autil.mk_ge(
m_autil.mk_add(substrPos, substrLen, m_autil.mk_mul(minusOne, mk_strlen(substrBase))),
zero), m);
SASSERT(lenOutOfBounds);
ctx.internalize(argumentsValid, false);
// Case 1: pos < 0 or pos >= strlen(base) or len < 0
// ==> (Substr ...) = ""
expr_ref case1_premise(m.mk_not(argumentsValid), m);
SASSERT(case1_premise);
ctx.internalize(case1_premise, false);
expr_ref case1_conclusion(ctx.mk_eq_atom(expr, mk_string("")), m);
SASSERT(case1_conclusion);
ctx.internalize(case1_conclusion, false);
expr_ref case1(rewrite_implication(case1_premise, case1_conclusion), m);
SASSERT(case1);
// Case 2: (pos >= 0 and pos < strlen(base) and len >= 0) and (pos+len) >= strlen(base)
// ==> base = t0.t1 AND len(t0) = pos AND (Substr ...) = t1
expr_ref t0(mk_str_var("t0"), m);
expr_ref t1(mk_str_var("t1"), m);
expr_ref case2_conclusion(m.mk_and(
ctx.mk_eq_atom(substrBase, mk_concat(t0,t1)),
ctx.mk_eq_atom(mk_strlen(t0), substrPos),
ctx.mk_eq_atom(expr, t1)), m);
expr_ref case2(rewrite_implication(m.mk_and(argumentsValid, lenOutOfBounds), case2_conclusion), m);
SASSERT(case2);
// Case 3: (pos >= 0 and pos < strlen(base) and len >= 0) and (pos+len) < strlen(base)
// ==> base = t2.t3.t4 AND len(t2) = pos AND len(t3) = len AND (Substr ...) = t3
expr_ref t2(mk_str_var("t2"), m);
expr_ref t3(mk_str_var("t3"), m);
expr_ref t4(mk_str_var("t4"), m);
expr_ref_vector case3_conclusion_terms(m);
case3_conclusion_terms.push_back(ctx.mk_eq_atom(substrBase, mk_concat(t2, mk_concat(t3, t4))));
case3_conclusion_terms.push_back(ctx.mk_eq_atom(mk_strlen(t2), substrPos));
case3_conclusion_terms.push_back(ctx.mk_eq_atom(mk_strlen(t3), substrLen));
case3_conclusion_terms.push_back(ctx.mk_eq_atom(expr, t3));
expr_ref case3_conclusion(mk_and(case3_conclusion_terms), m);
expr_ref case3(rewrite_implication(m.mk_and(argumentsValid, m.mk_not(lenOutOfBounds)), case3_conclusion), m);
SASSERT(case3);
ctx.internalize(case1, false);
ctx.internalize(case2, false);
ctx.internalize(case3, false);
expr_ref finalAxiom(m.mk_and(case1, case2, case3), m);
SASSERT(finalAxiom);
assert_axiom(finalAxiom);
}
#if 0
// rewrite
// requires to add th_rewriter to assert_axiom to enforce normal form.
void theory_str::instantiate_axiom_Substr(enode * e) {
context & ctx = get_context();
ast_manager & m = get_manager();
@ -1495,6 +1590,7 @@ namespace smt {
assert_axiom(case2);
assert_axiom(case3);
}
#endif
void theory_str::instantiate_axiom_Replace(enode * e) {
context & ctx = get_context();