Move the overloading logic of Sema::ActOnCallExpr to a separate function
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60093 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 3321ef1..14e0f44 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -2963,6 +2963,52 @@
return 0;
}
+/// ResolveOverloadedCallFn - Given the call expression that calls Fn
+/// (which eventually refers to the set of overloaded functions in
+/// Ovl) and the call arguments Args/NumArgs, attempt to resolve the
+/// function call down to a specific function. If overload resolution
+/// succeeds, returns an expression that refers to a specific function
+/// and deletes Fn. Otherwise, emits diagnostics, deletes all of the
+/// arguments and Fn, and returns NULL.
+Expr *Sema::ResolveOverloadedCallFn(Expr *Fn, OverloadedFunctionDecl *Ovl,
+ SourceLocation LParenLoc,
+ Expr **Args, unsigned NumArgs,
+ SourceLocation *CommaLocs,
+ SourceLocation RParenLoc) {
+ OverloadCandidateSet CandidateSet;
+ AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet);
+ OverloadCandidateSet::iterator Best;
+ switch (BestViableFunction(CandidateSet, Best)) {
+ case OR_Success: {
+ Expr *NewFn = new DeclRefExpr(Best->Function, Best->Function->getType(),
+ Fn->getSourceRange().getBegin());
+ Fn->Destroy(Context);
+ return NewFn;
+ }
+
+ case OR_No_Viable_Function:
+ Diag(Fn->getSourceRange().getBegin(),
+ diag::err_ovl_no_viable_function_in_call)
+ << Ovl->getDeclName() << (unsigned)CandidateSet.size()
+ << Fn->getSourceRange();
+ PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
+ break;
+
+ case OR_Ambiguous:
+ Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_ambiguous_call)
+ << Ovl->getDeclName() << Fn->getSourceRange();
+ PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
+ break;
+ }
+
+ // Overload resolution failed. Destroy all of the subexpressions and
+ // return NULL.
+ Fn->Destroy(Context);
+ for (unsigned Arg = 0; Arg < NumArgs; ++Arg)
+ Args[Arg]->Destroy(Context);
+ return 0;
+}
+
/// BuildCallToObjectOfClassType - Build a call to an object of class
/// type (C++ [over.call.object]), which can end up invoking an
/// overloaded function call operator (@c operator()) or performing a