AST: Implement mangling support for function types without a prototype.

Function types without prototypes can arise when mangling a function type
within an overloadable function in C. We mangle these as the absence of
any parameter types (not even an empty parameter list).

Differential Revision: http://reviews.llvm.org/D11848

llvm-svn: 244374

2 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/CodeGen/mangle-ms.c b/clang/test/CodeGen/mangle-ms.c
new file mode 100644
index 00000000000..0ad43d5e06c
--- /dev/null
+++ b/clang/test/CodeGen/mangle-ms.c
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-pc-win32 | FileCheck %s
+
+// CHECK: define void @"\01?f@@$$J0YAXP6AX@Z@Z"
+__attribute__((overloadable)) void f(void (*x)()) {}
diff --git a/clang/test/CodeGen/overloadable.c b/clang/test/CodeGen/overloadable.c
index 8b40e4d7340..4946c6d9286 100644
--- a/clang/test/CodeGen/overloadable.c
+++ b/clang/test/CodeGen/overloadable.c
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck %s
 // CHECK: _Z1fPA10_1X
+// CHECK: _Z1fPFvE
 
 int __attribute__((overloadable)) f(int x) { return x; }
 float __attribute__((overloadable)) f(float x) { return x; }
@@ -13,6 +14,8 @@ void  __attribute__((overloadable)) f(struct X (*ptr)[10]) { }
 
 void __attribute__((overloadable)) f(int x, int y, ...) { }
 
+void __attribute__((overloadable)) f(void (*x)()) {}
+
 int main() {
   int iv = 17;
   float fv = 3.0f;