+
+ // Instruction metadata resolution. Each instruction can have a list of
+ // MDRef info associated with them.
+ //
+ // The simpler approach of just creating temporary MDNodes and then calling
+ // RAUW on them when the definition is processed doesn't work because some
+ // instruction metadata kinds, such as dbg, get stored in the IR in an
+ // "optimized" format which doesn't participate in the normal value use
+ // lists. This means that RAUW doesn't work, even on temporary MDNodes
+ // which otherwise support RAUW. Instead, we defer resolving MDNode
+ // references until the definitions have been processed.
+ struct MDRef {
+ SMLoc Loc;
+ unsigned MDKind, MDSlot;
+ };
+ DenseMap<Instruction*, std::vector<MDRef> > ForwardRefInstMetadata;