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fix bug in conflict clause generation in seq-branch-variable

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-02-26 18:15:45 -08:00
parent 4c408165ab
commit ce8862d415
11 changed files with 344 additions and 87 deletions
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21
src/ast/ast_smt_pp.cpp
View file

@ -30,6 +30,7 @@ Revision History:
#include"for_each_ast.h"
#include"decl_collector.h"
#include"smt2_util.h"
#include"seq_decl_plugin.h"
// ---------------------------------------
// smt_renaming
@ -160,6 +161,7 @@ class smt_printer {
unsigned m_num_lets;
arith_util m_autil;
bv_util m_bvutil;
seq_util m_sutil;
family_id m_basic_fid;
family_id m_bv_fid;
family_id m_arith_fid;
@ -247,6 +249,10 @@ class smt_printer {
}
if (m_is_smt2) {
if (is_sort_symbol && sym == symbol("String")) {
m_out << "String";
return;
}
if (is_sort_symbol && sym != symbol("BitVec")) {
m_out << "(" << sym << " ";
}
@ -397,6 +403,7 @@ class smt_printer {
bool is_int, pos;
buffer<symbol> names;
unsigned bv_size;
zstring s;
unsigned num_args = n->get_num_args();
func_decl* decl = n->get_decl();
if (m_autil.is_numeral(n, val, is_int)) {
@ -415,6 +422,19 @@ class smt_printer {
display_rational(val, is_int);
}
}
else if (m_sutil.str.is_string(n, s)) {
std::string encs = s.encode();
m_out << "\"";
for (unsigned i = 0; i < encs.length(); ++i) {
if (encs[i] == '\"') {
m_out << "\"\"";
}
else {
m_out << encs[i];
}
}
m_out << "\"";
}
else if (m_bvutil.is_numeral(n, val, bv_size)) {
if (m_is_smt2) {
m_out << "(_ bv" << val << " " << bv_size << ")";
@ -797,6 +817,7 @@ public:
m_num_lets(0),
m_autil(m),
m_bvutil(m),
m_sutil(m),
m_logic(logic),
m_AUFLIRA("AUFLIRA"),
// It's much easier to read those testcases with that.

40
src/ast/rewriter/seq_rewriter.cpp
View file

@ -437,7 +437,12 @@ br_status seq_rewriter::mk_seq_contains(expr* a, expr* b, expr_ref& result) {
m_util.str.get_concat(a, as);
m_util.str.get_concat(b, bs);
bool all_values = true;
if (bs.empty()) {
result = m().mk_true();
return BR_DONE;
}
for (unsigned i = 0; all_values && i < bs.size(); ++i) {
all_values = m().is_value(bs[i].get());
}
@ -459,6 +464,39 @@ br_status seq_rewriter::mk_seq_contains(expr* a, expr* b, expr_ref& result) {
result = m().mk_false();
return BR_DONE;
}
unsigned lenA = 0, lenB = 0;
bool lA = min_length(as.size(), as.c_ptr(), lenA);
if (lA) {
bool lB = min_length(bs.size(), bs.c_ptr(), lenB);
if (lenB > lenA) {
result = m().mk_false();
return BR_DONE;
}
}
if (as.empty()) {
result = m().mk_eq(b, m_util.str.mk_empty(m().get_sort(b)));
return BR_REWRITE2;
}
unsigned offs = 0;
unsigned sz = as.size();
expr* b0 = bs[0].get();
expr* bL = bs[bs.size()-1].get();
for (; offs < as.size() && m().are_distinct(b0, as[offs].get()); ++offs) {};
for (; sz > offs && m().are_distinct(bL, as[sz-1].get()); --sz) {}
if (offs == sz) {
result = m().mk_eq(b, m_util.str.mk_empty(m().get_sort(b)));
return BR_REWRITE2;
}
if (offs > 0 || sz < as.size()) {
SASSERT(sz > offs);
result = m_util.str.mk_contains(m_util.str.mk_concat(sz-offs, as.c_ptr()+offs), b);
return BR_REWRITE2;
}
return BR_FAILED;
}

12
src/ast/seq_decl_plugin.h
View file

@ -222,16 +222,16 @@ public:
str(seq_util& u): u(u), m(u.m), m_fid(u.m_fid) {}
sort* mk_seq(sort* s) { parameter param(s); return m.mk_sort(m_fid, SEQ_SORT, 1, &param); }
sort* mk_string_sort() { return m.mk_sort(m_fid, _STRING_SORT, 0, 0); }
app* mk_empty(sort* s) { return m.mk_const(m.mk_func_decl(m_fid, OP_SEQ_EMPTY, 0, 0, 0, (expr*const*)0, s)); }
sort* mk_string_sort() const { return m.mk_sort(m_fid, _STRING_SORT, 0, 0); }
app* mk_empty(sort* s) const { return m.mk_const(m.mk_func_decl(m_fid, OP_SEQ_EMPTY, 0, 0, 0, (expr*const*)0, s)); }
app* mk_string(zstring const& s);
app* mk_string(symbol const& s) { return u.seq.mk_string(s); }
app* mk_char(char ch);
app* mk_concat(expr* a, expr* b) { expr* es[2] = { a, b }; return m.mk_app(m_fid, OP_SEQ_CONCAT, 2, es); }
app* mk_concat(expr* a, expr* b) const { expr* es[2] = { a, b }; return m.mk_app(m_fid, OP_SEQ_CONCAT, 2, es); }
app* mk_concat(expr* a, expr* b, expr* c) { return mk_concat(a, mk_concat(b, c)); }
expr* mk_concat(unsigned n, expr* const* es) { if (n == 1) return es[0]; SASSERT(n > 1); return m.mk_app(m_fid, OP_SEQ_CONCAT, n, es); }
expr* mk_concat(expr_ref_vector const& es) { return mk_concat(es.size(), es.c_ptr()); }
app* mk_length(expr* a) { return m.mk_app(m_fid, OP_SEQ_LENGTH, 1, &a); }
expr* mk_concat(unsigned n, expr* const* es) const { if (n == 1) return es[0]; SASSERT(n > 1); return m.mk_app(m_fid, OP_SEQ_CONCAT, n, es); }
expr* mk_concat(expr_ref_vector const& es) const { return mk_concat(es.size(), es.c_ptr()); }
app* mk_length(expr* a) const { return m.mk_app(m_fid, OP_SEQ_LENGTH, 1, &a); }
app* mk_substr(expr* a, expr* b, expr* c) { expr* es[3] = { a, b, c }; return m.mk_app(m_fid, OP_SEQ_EXTRACT, 3, es); }
app* mk_contains(expr* a, expr* b) { expr* es[2] = { a, b }; return m.mk_app(m_fid, OP_SEQ_CONTAINS, 2, es); }
app* mk_prefix(expr* a, expr* b) { expr* es[2] = { a, b }; return m.mk_app(m_fid, OP_SEQ_PREFIX, 2, es); }