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Another simple case type merge case to try 

llvm-svn: 27831
This commit is contained in:
Andrew Lenharth 2006-04-19 15:34:34 +00:00
parent edf349aba6
commit 02f9df3b7b
1 changed files with 24 additions and 0 deletions
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24
llvm/lib/Analysis/DataStructure/DataStructure.cpp
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@ -532,6 +532,30 @@ bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset,
return mergeTypeInfo(STy, 0);
}
//Ty: struct { t1, t2, t3 ... tn}
//NewTy T offset x
//try merge with NewTy: struct : {t1, t2, T} if offset lands on a field in Ty
if (isa<StructType>(Ty)) {
DEBUG(std::cerr << "Ty: " << *Ty << "\nNewTy: " << *NewTy << "@" << Offset << "\n");
unsigned O = 0;
const StructType *STy = cast<StructType>(Ty);
const StructLayout &SL = *TD.getStructLayout(STy);
unsigned i = SL.getElementContainingOffset(Offset);
//Either we hit it exactly or give up
if (SL.MemberOffsets[i] != Offset) {
if (FoldIfIncompatible) foldNodeCompletely();
return true;
}
std::vector<const Type*> nt;
for (unsigned x = 0; x < i; ++x)
nt.push_back(STy->getElementType(x));
nt.push_back(NewTy);
//and merge
STy = StructType::get(nt);
DEBUG(std::cerr << "Trying with: " << *STy << "\n");
return mergeTypeInfo(STy, 0);
}
std::cerr << "UNIMP: Trying to merge a growth type into "
<< "offset != 0: Collapsing!\n";
abort();