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Minor cleanups

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llvm-svn: 9958
This commit is contained in:
Chris Lattner 2003-11-13 02:01:41 +00:00
parent 55ad096ff8
commit d2ce57f9d8
1 changed files with 36 additions and 41 deletions
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77
include/Support/SCCIterator.h
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@ -78,56 +78,51 @@ class scc_iterator
// The stack-based DFS traversal; defined below.
void DFSVisitChildren() {
assert(!VisitStack.empty());
while (VisitStack.back().second != GT::child_end(VisitStack.back().first))
{ // TOS has at least one more child so continue DFS
NodeType *childN = *VisitStack.back().second++;
if (nodeVisitNumbers.find(childN) == nodeVisitNumbers.end())
{ // this node has never been seen
DFSVisitOne(childN);
}
else
{
unsigned childNum = nodeVisitNumbers[childN];
if (MinVisitNumStack.back() > childNum)
MinVisitNumStack.back() = childNum;
}
while (VisitStack.back().second != GT::child_end(VisitStack.back().first)) {
// TOS has at least one more child so continue DFS
NodeType *childN = *VisitStack.back().second++;
if (!nodeVisitNumbers.count(childN)) {
// this node has never been seen
DFSVisitOne(childN);
} else {
unsigned childNum = nodeVisitNumbers[childN];
if (MinVisitNumStack.back() > childNum)
MinVisitNumStack.back() = childNum;
}
}
}
// Compute the next SCC using the DFS traversal.
void GetNextSCC() {
assert(VisitStack.size() == MinVisitNumStack.size());
CurrentSCC.clear(); // Prepare to compute the next SCC
while (! VisitStack.empty())
{
DFSVisitChildren();
while (!VisitStack.empty()) {
DFSVisitChildren();
assert(VisitStack.back().second ==GT::child_end(VisitStack.back().first));
NodeType* visitingN = VisitStack.back().first;
unsigned minVisitNum = MinVisitNumStack.back();
VisitStack.pop_back();
MinVisitNumStack.pop_back();
if (!MinVisitNumStack.empty() && MinVisitNumStack.back() > minVisitNum)
MinVisitNumStack.back() = minVisitNum;
assert(VisitStack.back().second ==
GT::child_end(VisitStack.back().first));
NodeType* visitingN = VisitStack.back().first;
unsigned minVisitNum = MinVisitNumStack.back();
VisitStack.pop_back();
MinVisitNumStack.pop_back();
if (! MinVisitNumStack.empty() && MinVisitNumStack.back() > minVisitNum)
MinVisitNumStack.back() = minVisitNum;
//DEBUG(std::cerr << "TarjanSCC: Popped node " << visitingN <<
// " : minVisitNum = " << minVisitNum << "; Node visit num = " <<
// nodeVisitNumbers[visitingN] << "\n");
//DEBUG(std::cerr << "TarjanSCC: Popped node " << visitingN <<
// " : minVisitNum = " << minVisitNum << "; Node visit num = " <<
// nodeVisitNumbers[visitingN] << "\n");
if (minVisitNum == nodeVisitNumbers[visitingN])
{ // A full SCC is on the SCCNodeStack! It includes all nodes below
// visitingN on the stack. Copy those nodes to CurrentSCC,
// reset their minVisit values, and return (this suspends
// the DFS traversal till the next ++).
do {
CurrentSCC.push_back(SCCNodeStack.back());
SCCNodeStack.pop_back();
nodeVisitNumbers[CurrentSCC.back()] = ~0UL;
} while (CurrentSCC.back() != visitingN);
return;
}
}
if (minVisitNum == nodeVisitNumbers[visitingN]) {
// A full SCC is on the SCCNodeStack! It includes all nodes below
// visitingN on the stack. Copy those nodes to CurrentSCC,
// reset their minVisit values, and return (this suspends
// the DFS traversal till the next ++).
do {
CurrentSCC.push_back(SCCNodeStack.back());
SCCNodeStack.pop_back();
nodeVisitNumbers[CurrentSCC.back()] = ~0UL;
} while (CurrentSCC.back() != visitingN);
return;
}
}
}
inline scc_iterator(NodeType *entryN) : visitNum(0) {