Commit 5cb19a29 authored by Alexandre Duret-Lutz's avatar Alexandre Duret-Lutz
Browse files

scc_filter: do not remove Fin sets from rejecting SCCs

* src/twaalgos/sccfilter.cc (acc_filter_some, acc_filter_all): Merge
into...
(acc_filter_mask): ... this single parametrized class, and only
remove sets that are only used as Inf.
* src/twa/acc.hh: Add missing operator~.
* src/tests/sccsimpl.test: Add test case.
* src/tests/sccdot.test: Adjust.
* NEWS: Mention the bug.
parent 5d9e7d1f
......@@ -2,6 +2,8 @@ New in spot 1.99.1a (not yet released)
* Bugs fixed:
- p[+][:*2] was not detected as belonging to siPSL
- scc_filter() would incorrectly remove Fin marks from
rejecting SCCs.
New in spot 1.99.1 (2015-06-23)
......
......@@ -168,7 +168,7 @@ State: 2
[0&1] 0 {0 1}
State: 3
[1] 1
[!1] 3
[!1] 3 {2}
State: 4
[!0&1] 4 {0 1}
[0&1] 4 {0 2}
......
......@@ -240,3 +240,105 @@ grep 'Acceptance: 2 ' out8.txt
run 0 ../ikwiad -R3 -s -RDS -ks \
'(G(!((b) R (a)))) R (((c) R (!(d))) U (G((a) | (!(G(e))))))' > out9.txt
grep 'states: 6$' out9.txt
# Spot 1.99.1 used to incorrectly remove Fin sets from rejecting SCCs
# in scc_filter().
cat >input <<EOF
HOA: v1
States: 2
Start: 1
Acceptance: 1 Fin(0)
AP: 1 "p0"
--BODY--
State: 0
[t] 0
State: 1
[!0] 1 {0}
[0] 0
--END--
HOA: v1
States: 2
Start: 1
Acceptance: 2 Fin(0)&Inf(1)
AP: 1 "p0"
--BODY--
State: 0 {1}
[t] 0
State: 1
[!0] 1 {0 1}
[0] 0
--END--
EOF
# run 0 ../../bin/autfilt -C -H --any --high input >output
# cat >expected <<EOF
# HOA: v1
# States: 2
# Start: 1
# AP: 1 "p0"
# acc-name: Buchi
# Acceptance: 1 Inf(0)
# properties: trans-labels explicit-labels state-acc complete
# properties: deterministic inherently-weak
# --BODY--
# State: 0 {0}
# [t] 0
# State: 1
# [0] 0
# [!0] 1
# --END--
# HOA: v1
# States: 2
# Start: 1
# AP: 1 "p0"
# acc-name: Buchi
# Acceptance: 1 Inf(0)
# properties: trans-labels explicit-labels state-acc complete
# properties: deterministic inherently-weak
# --BODY--
# State: 0 {0}
# [t] 0
# State: 1
# [0] 0
# [!0] 1
# --END--
# EOF
# cat output
# diff output expected
run 0 ../../bin/autfilt -C -H --det --high input >output
cat >expected <<EOF
HOA: v1
States: 2
Start: 1
AP: 1 "p0"
acc-name: Buchi
Acceptance: 1 Inf(0)
properties: trans-labels explicit-labels state-acc complete
properties: deterministic inherently-weak
--BODY--
State: 0 {0}
[t] 0
State: 1
[0] 0
[!0] 1
--END--
HOA: v1
States: 2
Start: 1
AP: 1 "p0"
acc-name: Buchi
Acceptance: 1 Inf(0)
properties: trans-labels explicit-labels state-acc complete
properties: deterministic inherently-weak
--BODY--
State: 0 {0}
[t] 0
State: 1
[0] 0
[!0] 1
--END--
EOF
cat output
diff output expected
......@@ -157,6 +157,11 @@ namespace spot
return id & ~r.id;
}
mark_t operator~() const
{
return ~id;
}
mark_t operator^(mark_t r) const
{
return id ^ r.id;
......
......@@ -125,14 +125,24 @@ namespace spot
};
// Remove acceptance conditions from all edges outside of
// non-accepting SCCs.
template <class next_filter = id_filter>
struct acc_filter_all: next_filter
// non-accepting SCCs. If "RemoveAll" is false, keep those on
// transitions entering accepting SCCs.
template <bool RemoveAll, class next_filter = id_filter>
struct acc_filter_mask: next_filter
{
acc_cond::mark_t accmask;
template<typename... Args>
acc_filter_all(scc_info* si, Args&&... args)
acc_filter_mask(scc_info* si, Args&&... args)
: next_filter(si, std::forward<Args>(args)...)
{
acc_cond::mark_t fin;
acc_cond::mark_t inf;
std::tie(inf, fin) =
si->get_aut()->acc().get_acceptance().used_inf_fin_sets();
// If an SCC is rejecting, we can mask all the sets that are
// used only as Inf in the acceptance.
accmask = ~(inf - fin);
}
filtered_trans trans(unsigned src, unsigned dst,
......@@ -144,41 +154,18 @@ namespace spot
if (keep)
{
unsigned u = this->si->scc_of(src);
unsigned u = this->si->scc_of(dst);
// If the edge is between two SCCs, or in a
// non-accepting SCC. Remove the acceptance sets.
if (this->si->is_rejecting_scc(u) || u != this->si->scc_of(dst))
acc = 0U;
if ((this->si->is_rejecting_scc(u))
|| (RemoveAll && u != this->si->scc_of(src)))
acc &= accmask;
}
return filtered_trans(keep, cond, acc);
}
};
// Remove acceptance conditions from all edges whose
// destination is not an accepting SCCs.
template <class next_filter = id_filter>
struct acc_filter_some: next_filter
{
template<typename... Args>
acc_filter_some(scc_info* si, Args&&... args)
: next_filter(si, std::forward<Args>(args)...)
{
}
filtered_trans trans(unsigned src, unsigned dst,
bdd cond, acc_cond::mark_t acc)
{
bool keep;
std::tie(keep, cond, acc) =
this->next_filter::trans(src, dst, cond, acc);
if (this->si->is_rejecting_scc(this->si->scc_of(dst)))
acc = 0U;
return filtered_trans(keep, cond, acc);
}
};
// Simplify redundant acceptance sets used in each SCCs.
template <class next_filter = id_filter>
struct acc_filter_simplify: next_filter
......@@ -329,22 +316,24 @@ namespace spot
if (aut->acc().is_generalized_buchi())
{
if (remove_all_useless)
res = scc_filter_apply<state_filter
<acc_filter_all
<acc_filter_simplify<>>>>(aut, given_si);
res =
scc_filter_apply<state_filter
<acc_filter_mask
<true, acc_filter_simplify<>>>>(aut, given_si);
else
res = scc_filter_apply<state_filter
<acc_filter_some
<acc_filter_simplify<>>>>(aut, given_si);
res =
scc_filter_apply<state_filter
<acc_filter_mask
<false, acc_filter_simplify<>>>>(aut, given_si);
}
else
{
if (remove_all_useless)
res = scc_filter_apply<state_filter
<acc_filter_all<>>>(aut, given_si);
<acc_filter_mask<true>>>(aut, given_si);
else
res = scc_filter_apply<state_filter
<acc_filter_some<>>>(aut, given_si);
<acc_filter_mask<false>>>(aut, given_si);
}
res->merge_edges();
res->prop_copy(aut,
......@@ -365,16 +354,16 @@ namespace spot
if (remove_all_useless)
res = scc_filter_apply<susp_filter
<state_filter
<acc_filter_all
<acc_filter_simplify<>>>>>(aut, given_si,
<acc_filter_mask
<true, acc_filter_simplify<>>>>>(aut, given_si,
suspvars,
ignoredvars,
early_susp);
else
res = scc_filter_apply<susp_filter
<state_filter
<acc_filter_some
<acc_filter_simplify<>>>>>(aut, given_si,
<acc_filter_mask
<false, acc_filter_simplify<>>>>>(aut, given_si,
suspvars,
ignoredvars,
early_susp);
......
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