Revert the fix for PR8013.

That bug concerned the well-formedness of code such as (&ovl)(a, b,
c). GCC rejects the code, while EDG accepts it. On further study of the
standard, I see no support for EDG's position: in particular, C++
[over.over] does not list this as a context where we can take the
address of an overloaded function, C++ [over.call.func] does not
reference the address-of operator at any point, and C++ [expr.call]
claims that the function argument in a call is either a function
lvalue or a pointer-to-function; (&ovl) is neither.

llvm-svn: 118620

4 files changed, 8 insertions, 20 deletions

diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index 27943d5d3ff..73c19a755be 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -3306,10 +3306,6 @@ void Sema::CodeCompleteCall(Scope *S, ExprTy *FnIn,
   llvm::SmallVector<ResultCandidate, 8> Results;
 
   Expr *NakedFn = Fn->IgnoreParenCasts();
-  if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
-    if (UnOp->getOpcode() == UO_AddrOf)
-      NakedFn = UnOp->getSubExpr()->IgnoreParens();
-
   if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(NakedFn))
     AddOverloadedCallCandidates(ULE, Args, NumArgs, CandidateSet,
                                 /*PartialOverloading=*/ true);
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index f404c20b413..0d0f48cd743 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -3781,15 +3781,17 @@ Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
   // lookup and whether there were any explicitly-specified template arguments.
 
   Expr *NakedFn = Fn->IgnoreParens();
+  if (isa<UnresolvedLookupExpr>(NakedFn)) {
+    UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(NakedFn);
+    return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
+                                   RParenLoc);
+  }
+
   NamedDecl *NDecl = 0;
   if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
     if (UnOp->getOpcode() == UO_AddrOf)
       NakedFn = UnOp->getSubExpr()->IgnoreParens();
   
-  if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(NakedFn))
-    return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
-                                   RParenLoc);
-
   if (isa<DeclRefExpr>(NakedFn))
     NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
 
diff --git a/clang/test/CodeCompletion/call.cpp b/clang/test/CodeCompletion/call.cpp
index 65b1cf1f2b1..f06470f4cbe 100644
--- a/clang/test/CodeCompletion/call.cpp
+++ b/clang/test/CodeCompletion/call.cpp
@@ -17,14 +17,12 @@ void f();
 
 void test() {
   f(Y(), 0, 0);
-  (&f)(Y(), 0, 0);
-  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:19:9 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:19:9 %s -o - | FileCheck -check-prefix=CC1 %s
   // CHECK-CC1: COMPLETION: Pattern : dynamic_cast<<#type#>>(<#expression#>)
   // CHECK-CC1: f(N::Y y, <#int ZZ#>)
   // CHECK-CC1-NEXT: f(int i, <#int j#>, int k)
   // CHECK-CC1-NEXT: f(float x, <#float y#>)
-  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:19:13 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:19:13 %s -o - | FileCheck -check-prefix=CC2 %s
   // CHECK-CC2-NOT: f(N::Y y, int ZZ)
   // CHECK-CC2: f(int i, int j, <#int k#>)
 }
-  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:20:16 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
diff --git a/clang/test/SemaCXX/overload-call.cpp b/clang/test/SemaCXX/overload-call.cpp
index 7aeb9522f1f..81a88a3a9ac 100644
--- a/clang/test/SemaCXX/overload-call.cpp
+++ b/clang/test/SemaCXX/overload-call.cpp
@@ -503,11 +503,3 @@ namespace rdar8499524 {
     g(W());
   }
 }
-
-namespace PR8013 {
-  void f(int,int);
-  void f(int,int,int);
-  void g() {
-    (&f)(1,2,3);
-  }
-}