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add support for PHI nodes to ObjectSizeOffsetVisitor

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171298 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-12-31 13:52:36 +00:00
parent 6931055232
commit 729e602082
2 changed files with 68 additions and 3 deletions
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17
lib/Analysis/MemoryBuiltins.cpp
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@ -535,9 +535,20 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitLoadInst(LoadInst&) {
return unknown();
}
SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode(PHINode&) {
// too complex to analyze statically.
return unknown();
SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode(PHINode &PHI) {
if (PHI.getNumIncomingValues() == 0)
return unknown();
SizeOffsetType Ret = compute(PHI.getIncomingValue(0));
if (!bothKnown(Ret))
return unknown();
// verify that all PHI incoming pointers have the same size and offset
for (unsigned i = 1, e = PHI.getNumIncomingValues(); i != e; ++i) {
if (compute(PHI.getIncomingValue(i)) != Ret)
return unknown();
}
return Ret;
}
SizeOffsetType ObjectSizeOffsetVisitor::visitSelectInst(SelectInst &I) {