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Add MDBuilder utilities for path-aware TBAA.

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Add utilities to create struct nodes in TBAA type DAG and to create path-aware
tags. The format of struct nodes in TBAA type DAG: a unique name, a list of
fields with field offsets and field types. The format of path-aware tags:
a base type in TBAA type DAG, an access type and an offset relative to the base
type.

llvm-svn: 178564
This commit is contained in:
Manman Ren 2013-04-02 19:50:49 +00:00
parent c98ed219d3
commit 346f0fb858
1 changed files with 23 additions and 0 deletions
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23
include/llvm/IR/MDBuilder.h
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@ -156,6 +156,29 @@ public:
return MDNode::get(Context, Vals);
}
/// \brief Return metadata for a TBAA struct node in the type DAG
/// with the given name, parents in the TBAA DAG.
MDNode *createTBAAStructTypeNode(StringRef Name,
ArrayRef<std::pair<uint64_t, MDNode*> > Fields) {
SmallVector<Value *, 4> Ops(Fields.size() * 2 + 1);
Type *Int64 = IntegerType::get(Context, 64);
Ops[0] = createString(Name);
for (unsigned i = 0, e = Fields.size(); i != e; ++i) {
Ops[i * 2 + 1] = ConstantInt::get(Int64, Fields[i].first);
Ops[i * 2 + 2] = Fields[i].second;
}
return MDNode::get(Context, Ops);
}
/// \brief Return metadata for a TBAA tag node with the given
/// base type, access type and offset relative to the base type.
MDNode *createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType,
uint64_t Offset) {
Type *Int64 = IntegerType::get(Context, 64);
Value *Ops[3] = { BaseType, AccessType, ConstantInt::get(Int64, Offset) };
return MDNode::get(Context, Ops);
}
};
} // end namespace llvm