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Use CallbackVH in AliasSetTracker to avoid getting stuck with

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dangling Value*s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-07-30 20:21:41 +00:00
parent d8c95b5ac2
commit b5b56ba9d4
2 changed files with 36 additions and 6 deletions
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24
lib/Analysis/AliasSetTracker.cpp
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@ -187,8 +187,8 @@ bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
void AliasSetTracker::clear() {
// Delete all the PointerRec entries.
for (DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.begin(),
E = PointerMap.end(); I != E; ++I)
for (PointerMapType::iterator I = PointerMap.begin(), E = PointerMap.end();
I != E; ++I)
I->second->eraseFromList();
PointerMap.clear();
@ -485,7 +485,7 @@ void AliasSetTracker::deleteValue(Value *PtrVal) {
AS->removeCallSite(CS);
// First, look up the PointerRec for this pointer.
DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.find(PtrVal);
PointerMapType::iterator I = PointerMap.find(PtrVal);
if (I == PointerMap.end()) return; // Noop
// If we found one, remove the pointer from the alias set it is in.
@ -511,7 +511,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) {
AA.copyValue(From, To);
// First, look up the PointerRec for this pointer.
DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.find(From);
PointerMapType::iterator I = PointerMap.find(From);
if (I == PointerMap.end())
return; // Noop
assert(I->second->hasAliasSet() && "Dead entry?");
@ -575,6 +575,22 @@ void AliasSetTracker::print(std::ostream &OS) const {
void AliasSet::dump() const { print (cerr); }
void AliasSetTracker::dump() const { print(cerr); }
//===----------------------------------------------------------------------===//
// ASTCallbackVH Class Implementation
//===----------------------------------------------------------------------===//
void AliasSetTracker::ASTCallbackVH::deleted() {
assert(AST && "ASTCallbackVH called with a null AliasSetTracker!");
AST->deleteValue(getValPtr());
// this now dangles!
}
AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
: CallbackVH(V == DenseMapInfo<Value *>::getEmptyKey() ? 0 :
V == DenseMapInfo<Value *>::getTombstoneKey() ? 0 :
V),
AST(ast) {}
//===----------------------------------------------------------------------===//
// AliasSetPrinter Pass
//===----------------------------------------------------------------------===//