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Handle case where there is no exit node from a flowgraph

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-08-23 17:07:19 +00:00
parent 9407be443e
commit 384e5b1595
2 changed files with 18 additions and 6 deletions
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12
lib/Analysis/PostDominators.cpp
View File

@ -32,7 +32,8 @@ void set_intersect(set<Ty> &S1, const set<Ty2> &S2) {
//===----------------------------------------------------------------------===//
bool cfg::DominatorBase::isPostDominator() const {
return Root != Root->getParent()->front();
// Root can be null if there is no exit node from the CFG and is postdom set
return Root == 0 || Root != Root->getParent()->front();
}
@ -96,7 +97,11 @@ cfg::DominatorSet::DominatorSet(Method *M, bool PostDomSet)
if (!PostDomSet) { calcForwardDominatorSet(M); return; }
Root = cfg::UnifyAllExitNodes(M);
assert(Root && "TODO: Don't handle case where there are no exit nodes yet!");
if (Root == 0) { // No exit node for the method? Postdomsets are all empty
for (Method::iterator MI = M->begin(), ME = M->end(); MI != ME; ++MI)
Doms[*MI] = DomSetType();
return;
}
bool Changed;
do {
@ -255,7 +260,7 @@ void cfg::DominatorTree::calculate(const DominatorSet &DS) {
}
}
}
} else {
} else if (Root) {
// Iterate over all nodes in depth first order...
for (idf_const_iterator I = idf_begin(Root), E = idf_end(Root); I != E; ++I) {
const BasicBlock *BB = *I;
@ -343,6 +348,7 @@ cfg::DominanceFrontier::calcPostDomFrontier(const DominatorTree &DT,
// Loop over CFG successors to calculate DFlocal[Node]
const BasicBlock *BB = Node->getNode();
DomSetType &S = Frontiers[BB]; // The new set to fill in...
if (!Root) return S;
for (pred_const_iterator SI = pred_begin(BB), SE = pred_end(BB);
SI != SE; ++SI) {

12
lib/VMCore/Dominators.cpp
View File

@ -32,7 +32,8 @@ void set_intersect(set<Ty> &S1, const set<Ty2> &S2) {
//===----------------------------------------------------------------------===//
bool cfg::DominatorBase::isPostDominator() const {
return Root != Root->getParent()->front();
// Root can be null if there is no exit node from the CFG and is postdom set
return Root == 0 || Root != Root->getParent()->front();
}
@ -96,7 +97,11 @@ cfg::DominatorSet::DominatorSet(Method *M, bool PostDomSet)
if (!PostDomSet) { calcForwardDominatorSet(M); return; }
Root = cfg::UnifyAllExitNodes(M);
assert(Root && "TODO: Don't handle case where there are no exit nodes yet!");
if (Root == 0) { // No exit node for the method? Postdomsets are all empty
for (Method::iterator MI = M->begin(), ME = M->end(); MI != ME; ++MI)
Doms[*MI] = DomSetType();
return;
}
bool Changed;
do {
@ -255,7 +260,7 @@ void cfg::DominatorTree::calculate(const DominatorSet &DS) {
}
}
}
} else {
} else if (Root) {
// Iterate over all nodes in depth first order...
for (idf_const_iterator I = idf_begin(Root), E = idf_end(Root); I != E; ++I) {
const BasicBlock *BB = *I;
@ -343,6 +348,7 @@ cfg::DominanceFrontier::calcPostDomFrontier(const DominatorTree &DT,
// Loop over CFG successors to calculate DFlocal[Node]
const BasicBlock *BB = Node->getNode();
DomSetType &S = Frontiers[BB]; // The new set to fill in...
if (!Root) return S;
for (pred_const_iterator SI = pred_begin(BB), SE = pred_end(BB);
SI != SE; ++SI) {