Debuginfo: Correctly tag variadic ObjC methods with DW_TAG_unspecified_parameter.

Fixes rdar://13690847

llvm-svn: 215423

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -2429,6 +2429,9 @@ llvm::DICompositeType CGDebugInfo::getOrCreateFunctionType(const Decl *D,
     // Get rest of the arguments.
     for (const auto *PI : OMethod->params())
       Elts.push_back(getOrCreateType(PI->getType(), F));
+    // Variadic methods need a special marker at the end of the type list.
+    if (OMethod->isVariadic())
+      Elts.push_back(DBuilder.createUnspecifiedParameter());
 
     llvm::DITypeArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
     return DBuilder.createSubroutineType(F, EltTypeArray);

clang/test/CodeGenObjC/debug-info-variadic-method.m

@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -o - -emit-llvm -g %s | FileCheck %s
+
+// This test verifies that variadic ObjC methods get the
+// DW_TAG_unspecified_parameter marker.
+
+@interface Foo
+- (void) Bar: (int) n, ...;
+@end
+
+@implementation Foo
+- (void) Bar: (int) n, ...
+{
+  // CHECK: metadata ![[NUM:[^,]*]], i32 0, null, null, null} ; [ DW_TAG_subroutine_type ]
+  // CHECK: ![[NUM]] = {{metadata !{null, metadata ![^,]*, metadata ![^,]*, metadata ![^,]*, null}}}    
+}
+@end