+const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
+ if (Layouts == 0)
+ Layouts = new std::map<std::pair<const TargetData*,const StructType*>,
+ StructLayout>();
+ std::map<std::pair<const TargetData*,const StructType*>,
+ StructLayout>::iterator
+ I = Layouts->lower_bound(std::make_pair(this, Ty));
+ if (I != Layouts->end() && I->first.first == this && I->first.second == Ty)
+ return &I->second;
+ else {
+ return &Layouts->insert(I, std::make_pair(std::make_pair(this, Ty),
+ StructLayout(Ty, *this)))->second;
+ }
+}
+
+/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout
+/// objects. If a TargetData object is alive when types are being refined and
+/// removed, this method must be called whenever a StructType is removed to
+/// avoid a dangling pointer in this cache.
+void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
+ if (!Layouts) return; // No cache.
+
+ std::map<std::pair<const TargetData*,const StructType*>,
+ StructLayout>::iterator I = Layouts->find(std::make_pair(this, Ty));
+ if (I != Layouts->end())
+ Layouts->erase(I);
+}
+
+
+