[LazyCallGraph] Add invalidate method.

[asbirlea]

Summary

Add invalidate method in LazyCallGraph.

[aeubanks]

llvm/lib/Analysis/LazyCallGraph.cpp

224

is this correct? we can add/remove calls without changing the CFG of a function right?

llvm/include/llvm/Analysis/LazyCallGraph.h

#endif
   /// No function definitions are scanned until their nodes in the graph are
   /// requested during traversal.
   LazyCallGraph(Module &M,
                 function_ref<TargetLibraryInfo &(Function &)> GetTLI);
 
   LazyCallGraph(LazyCallGraph &&G);
   LazyCallGraph &operator=(LazyCallGraph &&RHS);
 
+  bool invalidate(Module &, const PreservedAnalyses &PA,
+                  ModuleAnalysisManager::Invalidator &);
+
   EdgeSequence::iterator begin() { return EntryEdges.begin(); }
   EdgeSequence::iterator end() { return EntryEdges.end(); }
 
   void buildRefSCCs();
 
   postorder_ref_scc_iterator postorder_ref_scc_begin() {
     if (!EntryEdges.empty())
       assert(!PostOrderRefSCCs.empty() &&

llvm/lib/Analysis/LazyCallGraph.cpp

 LazyCallGraph::LazyCallGraph(LazyCallGraph &&G)
     : BPA(std::move(G.BPA)), NodeMap(std::move(G.NodeMap)),
       EntryEdges(std::move(G.EntryEdges)), SCCBPA(std::move(G.SCCBPA)),
       SCCMap(std::move(G.SCCMap)),
       LibFunctions(std::move(G.LibFunctions)) {
   updateGraphPtrs();
 }
 
+bool LazyCallGraph::invalidate(Module &, const PreservedAnalyses &PA,
+                               ModuleAnalysisManager::Invalidator &) {
+  // Check whether the analysis, all analyses on functions, or the function's
+  // CFG have been preserved.
+  auto PAC = PA.getChecker<llvm::LazyCallGraphAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Module>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 LazyCallGraph &LazyCallGraph::operator=(LazyCallGraph &&G) {
   BPA = std::move(G.BPA);
   NodeMap = std::move(G.NodeMap);
   EntryEdges = std::move(G.EntryEdges);
   SCCBPA = std::move(G.SCCBPA);
   SCCMap = std::move(G.SCCMap);
   LibFunctions = std::move(G.LibFunctions);
   updateGraphPtrs();