+ /// This checks for global variables which should be upgraded. It returns true
+ /// if it requires upgrading.
+ bool UpgradeGlobalVariable(GlobalVariable *GV);
+
+ /// If the TBAA tag for the given instruction uses the scalar TBAA format,
+ /// we upgrade it to the struct-path aware TBAA format.
+ void UpgradeInstWithTBAATag(Instruction *I);
+
+ /// This is an auto-upgrade for bitcast between pointers with different
+ /// address spaces: the instruction is replaced by a pair ptrtoint+inttoptr.
+ Instruction *UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
+ Instruction *&Temp);
+
+ /// This is an auto-upgrade for bitcast constant expression between pointers
+ /// with different address spaces: the instruction is replaced by a pair
+ /// ptrtoint+inttoptr.
+ Value *UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy);
+
+ /// Check the debug info version number, if it is out-dated, drop the debug
+ /// info. Return true if module is modified.
+ bool UpgradeDebugInfo(Module &M);