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Implement a new InvalidateStructLayoutInfo method and add some comments
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25304 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -131,6 +131,9 @@ TargetData::TargetData(const std::string &ToolName, const Module *M) {
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BoolAlignment = 1;
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}
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/// Layouts - The lazy cache of structure layout information maintained by
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/// TargetData.
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///
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static std::map<std::pair<const TargetData*,const StructType*>,
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StructLayout> *Layouts = 0;
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@ -165,6 +168,21 @@ const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
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}
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}
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/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout
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/// objects. If a TargetData object is alive when types are being refined and
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/// removed, this method must be called whenever a StructType is removed to
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/// avoid a dangling pointer in this cache.
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void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
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if (!Layouts) return; // No cache.
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std::map<std::pair<const TargetData*,const StructType*>,
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StructLayout>::iterator I = Layouts->find(std::make_pair(this, Ty));
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if (I != Layouts->end())
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Layouts->erase(I);
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}
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static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
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uint64_t &Size, unsigned char &Alignment) {
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assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
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