From 07b201d9c060d07a8f6dd55aed160aa5ec1fbc3a Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 14 Nov 2007 06:34:38 +0000
Subject: [PATCH] implement test/Sema/typedef-prototype.c, allowing code to
 declare a function with a typedef:

typedef int unary_int_func(int arg);
unary_int_func add_one;

This patch contributed by Seo Sanghyeon!

llvm-svn: 44100
---
 clang/Sema/Sema.h                   |  3 ++-
 clang/Sema/SemaDecl.cpp             | 16 ++++++----------
 clang/test/Sema/typedef-prototype.c |  8 ++++++++
 3 files changed, 16 insertions(+), 11 deletions(-)
 create mode 100644 clang/test/Sema/typedef-prototype.c

diff --git a/clang/Sema/Sema.h b/clang/Sema/Sema.h
index 40b966e52b67..8b470fe5c6c7 100644
--- a/clang/Sema/Sema.h
+++ b/clang/Sema/Sema.h
@@ -224,7 +224,8 @@ private:
                              DeclTy **Elements, unsigned NumElements);
 private:
   /// Subroutines of ActOnDeclarator()...
-  TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, ScopedDecl *LastDecl);
+  TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
+                                ScopedDecl *LastDecl);
   TypedefDecl *MergeTypeDefDecl(TypedefDecl *New, ScopedDecl *Old);
   FunctionDecl *MergeFunctionDecl(FunctionDecl *New, ScopedDecl *Old);
   VarDecl *MergeVarDecl(VarDecl *New, ScopedDecl *Old);
diff --git a/clang/Sema/SemaDecl.cpp b/clang/Sema/SemaDecl.cpp
index 1540b7caae45..36813bafca0d 100644
--- a/clang/Sema/SemaDecl.cpp
+++ b/clang/Sema/SemaDecl.cpp
@@ -572,8 +572,11 @@ Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) {
   ScopedDecl *New;
   bool InvalidDecl = false;
   
+  QualType R = GetTypeForDeclarator(D, S);
+  assert(!R.isNull() && "GetTypeForDeclarator() returned null type");
+
   if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
-    TypedefDecl *NewTD = ParseTypedefDecl(S, D, LastDeclarator);
+    TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator);
     if (!NewTD) return 0;
 
     // Handle attributes prior to checking for duplicates in MergeVarDecl
@@ -595,10 +598,7 @@ Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) {
         InvalidDecl = true;
       }
     }
-  } else if (D.isFunctionDeclarator()) {
-    QualType R = GetTypeForDeclarator(D, S);
-    assert(!R.isNull() && "GetTypeForDeclarator() returned null type");
-
+  } else if (R.getTypePtr()->isFunctionType()) {
     FunctionDecl::StorageClass SC = FunctionDecl::None;
     switch (D.getDeclSpec().getStorageClassSpec()) {
       default: assert(0 && "Unknown storage class!");
@@ -628,8 +628,6 @@ Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) {
     }
     New = NewFD;
   } else {
-    QualType R = GetTypeForDeclarator(D, S);
-    assert(!R.isNull() && "GetTypeForDeclarator() returned null type");
     if (R.getTypePtr()->isObjcInterfaceType()) {
       Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object,
            D.getIdentifier()->getName());
@@ -1041,11 +1039,9 @@ ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
 }
 
 
-TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D,
+TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
                                     ScopedDecl *LastDeclarator) {
   assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
-  
-  QualType T = GetTypeForDeclarator(D, S);
   assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
   
   // Scope manipulation handled by caller.
diff --git a/clang/test/Sema/typedef-prototype.c b/clang/test/Sema/typedef-prototype.c
new file mode 100644
index 000000000000..e646604ae389
--- /dev/null
+++ b/clang/test/Sema/typedef-prototype.c
@@ -0,0 +1,8 @@
+// RUN: clang -fsyntax-only -verify %s
+
+typedef int unary_int_func(int arg);
+unary_int_func add_one;
+
+int add_one(int arg) {
+  return arg + 1;
+}