r196658 - CodeGen: Don't emit linkage on thunks that aren't emitted because they're vararg.

[Benjamin Kramer]

Author: d0k
Date: Sat Dec  7 10:12:52 2013
New Revision: 196658

URL: http://llvm.org/viewvc/llvm-project?rev=196658&view=rev
Log:
CodeGen: Don't emit linkage on thunks that aren't emitted because they're vararg.

This can happen when we're trying to emit a thunk with available_externally
linkage with optimization enabled but bail because it doesn't make sense
for vararg functions.

PR18098.

Modified:
    cfe/trunk/lib/CodeGen/CGVTables.cpp
    cfe/trunk/test/CodeGenCXX/thunks.cpp

Modified: cfe/trunk/lib/CodeGen/CGVTables.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGVTables.cpp?rev=196658&r1=196657&r2=196658&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGVTables.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGVTables.cpp Sat Dec  7 10:12:52 2013
@@ -422,14 +422,15 @@ void CodeGenVTables::emitThunk(GlobalDec
     // expensive/sucky at the moment, so don't generate the thunk unless
     // we have to.
     // FIXME: Do something better here; GenerateVarArgsThunk is extremely ugly.
-    if (!UseAvailableExternallyLinkage)
+    if (!UseAvailableExternallyLinkage) {
       CodeGenFunction(CGM).GenerateVarArgsThunk(ThunkFn, FnInfo, GD, Thunk);
+      CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
+    }
   } else {
     // Normal thunk body generation.
     CodeGenFunction(CGM).GenerateThunk(ThunkFn, FnInfo, GD, Thunk);
+    CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
   }
-
-  CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
 }
 
 void CodeGenVTables::maybeEmitThunkForVTable(GlobalDecl GD,

Modified: cfe/trunk/test/CodeGenCXX/thunks.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/thunks.cpp?rev=196658&r1=196657&r2=196658&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/thunks.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/thunks.cpp Sat Dec  7 10:12:52 2013
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -emit-llvm -o - -O1 -disable-llvm-optzns | FileCheck %s
 // RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -fhidden-weak-vtables -emit-llvm -o - | FileCheck -check-prefix=CHECK-HIDDEN %s
 
 namespace Test1 {
@@ -342,6 +343,27 @@ namespace Test14 {
   // CHECK: define void @_ZThn8_N6Test141C1fEv({{.*}}) unnamed_addr [[NUW:#[0-9]+]]
 }
 
+// Varargs non-covariant thunk test.
+// PR18098
+namespace Test15 {
+  struct A {
+    virtual ~A();
+  };
+  struct B {
+    virtual void f(int x, ...);
+  };
+  struct C : A, B {
+    virtual void c();
+    virtual void f(int x, ...);
+  };
+  void C::c() {}
+
+  // C::c
+  // CHECK: declare void @_ZN6Test151C1fEiz
+  // non-virtual thunk to C::f
+  // CHECK: declare void @_ZThn8_N6Test151C1fEiz
+}
+
 /**** The following has to go at the end of the file ****/
 
 // This is from Test5: