Teach CallGraph to look into Generic Lambdas.

CallGraph visited LambdaExpr by getting the Call Operator from
CXXRecordDecl (LambdaExpr::getCallOperator calls
CXXRecordDecl::getLambdaCallOperator), which replaced generic lambda
call operators with the non-instantiated FunctionDecl.  The result was
that the CallGraph would only pick up non-dependent calls.

This patch does a few things:
1- Extend CXXRecordDecl to have a getDependentLambdaCallOperator, which
will get the FunctionTemplateDecl, rather than immediately getting the
TemplateDecl.
2- Define getLambdaCallOperator and getDependentLambdaCallOperator in
terms of a common function.
3- Extend LambdaExpr with a getDependentCallOperator, which just calls
the above function.
4- Changes CallGraph to handle Generic LambdaExprs.

llvm-svn: 373247

1 files changed, 4 insertions, 1 deletions

diff --git a/clang/lib/Analysis/CallGraph.cpp b/clang/lib/Analysis/CallGraph.cpp
index 865840eb341..76be292dad8 100644
--- a/clang/lib/Analysis/CallGraph.cpp
+++ b/clang/lib/Analysis/CallGraph.cpp
@@ -80,7 +80,10 @@ public:
   }
 
   void VisitLambdaExpr(LambdaExpr *LE) {
-    if (CXXMethodDecl *MD = LE->getCallOperator())
+    if (FunctionTemplateDecl *FTD = LE->getDependentCallOperator())
+      for (FunctionDecl *FD : FTD->specializations())
+        G->VisitFunctionDecl(FD);
+    else if (CXXMethodDecl *MD = LE->getCallOperator())
       G->VisitFunctionDecl(MD);
   }