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sccinfo: remove useless fields from the root stack

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* src/twaalgos/sccinfo.cc: Here.
This commit is contained in:
Alexandre Duret-Lutz 2015-07-09 11:21:33 +02:00
parent 344ac0f930
commit 9af40bf14e
1 changed files with 18 additions and 21 deletions
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39
src/twaalgos/sccinfo.cc
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@ -34,15 +34,16 @@ namespace spot
struct scc
{
public:
scc(int index, bdd in_cond, acc_cond::mark_t in_acc):
index(index), in_cond(in_cond), in_acc(in_acc)
scc(int index, acc_cond::mark_t in_acc):
in_acc(in_acc), index(index)
{
}
int index; // Index of the SCC
bdd in_cond; // Condition on incoming transition
acc_cond::mark_t in_acc; // Acceptance sets on the incoming transition
scc_info::scc_node node;
acc_cond::mark_t in_acc; // Acceptance sets on the incoming transition
acc_cond::mark_t acc = 0U; // union of all acceptance sets in the SCC
int index; // Index of the SCC
bool trivial = true; // Whether the SCC has no cycle
bool accepting = false; // Necessarily accepting
};
}
@ -79,7 +80,7 @@ namespace spot
unsigned init = aut->get_init_state_number();
num_ = -1;
h_[init] = num_;
root_.emplace_back(num_, bddfalse, 0U);
root_.emplace_back(num_, 0U);
todo_.emplace(init, aut->out(init).begin());
live.emplace_back(init);
}
@ -105,9 +106,8 @@ namespace spot
if (root_.back().index == h_[curr])
{
unsigned num = node_.size();
bdd cond = root_.back().in_cond;
auto acc = root_.back().node.acc_marks();
bool triv = root_.back().node.is_trivial();
auto acc = root_.back().acc;
bool triv = root_.back().trivial;
node_.emplace_back(acc, triv);
// Move all elements of this SCC from the live stack
@ -139,7 +139,7 @@ namespace spot
auto& succ = node_.back().succ_;
succ.insert(succ.end(), dests.begin(), dests.end());
node_.back().accepting_ =
!triv && root_.back().node.accepting_;
!triv && root_.back().accepting;
node_.back().rejecting_ =
triv || !aut->acc().inf_satisfiable(acc);
root_.pop_back();
@ -151,7 +151,6 @@ namespace spot
// Fetch the values we are interested in...
unsigned dest = succ->dst;
auto acc = succ->acc;
bdd cond = succ->cond;
++todo_.top().second;
// We do not need SUCC from now on.
@ -163,7 +162,7 @@ namespace spot
// Yes. Number it, stack it, and register its successors
// for later processing.
h_[dest] = --num_;
root_.emplace_back(num_, cond, acc);
root_.emplace_back(num_, acc);
todo_.emplace(dest, aut->out(dest).begin());
live.emplace_back(dest);
continue;
@ -187,7 +186,6 @@ namespace spot
// top of ROOT that have an index lesser than the one of
// the SCC of S2 (called the "threshold").
int threshold = spi;
scc_succs succs;
bool is_accepting = false;
// If this is a self-loop, check its acceptance alone.
if (dest == succ->src)
@ -196,9 +194,9 @@ namespace spot
assert(!root_.empty());
while (threshold > root_.back().index)
{
acc |= root_.back().node.acc_;
acc |= root_.back().acc;
acc |= root_.back().in_acc;
is_accepting |= root_.back().node.accepting_;
is_accepting |= root_.back().accepting;
root_.pop_back();
assert(!root_.empty());
}
@ -210,11 +208,11 @@ namespace spot
// Accumulate all acceptance conditions, states, SCC
// successors, and conditions into the merged SCC.
root_.back().node.acc_ |= acc;
root_.back().node.accepting_ |= is_accepting
|| aut->acc().accepting(root_.back().node.acc_);
root_.back().acc |= acc;
root_.back().accepting |= is_accepting
|| aut->acc().accepting(root_.back().acc);
// This SCC is no longer trivial.
root_.back().node.trivial_ = false;
root_.back().trivial = false;
}
determine_usefulness();
@ -227,7 +225,6 @@ namespace spot
unsigned scccount = scc_count();
for (unsigned i = 0; i < scccount; ++i)
{
if (!node_[i].is_rejecting())
{
node_[i].useful_ = true;