Fix PR17738 - add support for vtordisp thunks when using -cxx-abi microsoft
llvm-svn: 194132
diff --git a/clang/test/CodeGenCXX/microsoft-abi-virtual-inheritance-vtordisps.cpp b/clang/test/CodeGenCXX/microsoft-abi-virtual-inheritance-vtordisps.cpp
new file mode 100644
index 0000000..8e23ade
--- /dev/null
+++ b/clang/test/CodeGenCXX/microsoft-abi-virtual-inheritance-vtordisps.cpp
@@ -0,0 +1,83 @@
+// RUN: %clang_cc1 %s -fno-rtti -cxx-abi microsoft -triple=i386-pc-win32 -emit-llvm -o - | FileCheck %s
+
+// For now, just make sure x86_64 doesn't crash.
+// RUN: %clang_cc1 %s -fno-rtti -cxx-abi microsoft -triple=x86_64-pc-win32 -emit-llvm -o %t
+
+struct A {
+ virtual void f();
+};
+
+struct B {
+ virtual void f();
+};
+
+struct C : A, B {};
+
+struct D : virtual C {
+ D();
+ ~D();
+ virtual void f();
+ void g();
+ int xxx;
+};
+
+D::D() {} // Forces vftable emission.
+
+// CHECK-LABEL: define weak x86_thiscallcc void @"\01?f@D@@$4PPPPPPPM@A@AEXXZ"
+// CHECK: %[[ECX:.*]] = load %struct.D** %{{.*}}
+// CHECK: %[[ECX_i8:.*]] = bitcast %struct.D* %[[ECX]] to i8*
+// CHECK: %[[VTORDISP_PTR_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 -4
+// CHECK: %[[VTORDISP_PTR:.*]] = bitcast i8* %[[VTORDISP_PTR_i8]] to i32*
+// CHECK: %[[VTORDISP:.*]] = load i32* %[[VTORDISP_PTR]]
+// CHECK: %[[VTORDISP_NEG:.*]] = sub i32 0, %[[VTORDISP]]
+// CHECK: %[[ADJUSTED_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 %[[VTORDISP_NEG]]
+// CHECK: call x86_thiscallcc void @"\01?f@D@@UAEXXZ"(i8* %[[ADJUSTED_i8]])
+// CHECK: ret void
+
+// CHECK-LABEL: define weak x86_thiscallcc void @"\01?f@D@@$4PPPPPPPI@3AEXXZ"
+// CHECK: %[[ECX:.*]] = load %struct.D** %{{.*}}
+// CHECK: %[[ECX_i8:.*]] = bitcast %struct.D* %[[ECX]] to i8*
+// CHECK: %[[VTORDISP_PTR_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 -8
+// CHECK: %[[VTORDISP_PTR:.*]] = bitcast i8* %[[VTORDISP_PTR_i8]] to i32*
+// CHECK: %[[VTORDISP:.*]] = load i32* %[[VTORDISP_PTR]]
+// CHECK: %[[VTORDISP_NEG:.*]] = sub i32 0, %[[VTORDISP]]
+// CHECK: %[[VTORDISP_ADJUSTED_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 %[[VTORDISP_NEG]]
+// CHECK: %[[ADJUSTED_i8:.*]] = getelementptr i8* %[[VTORDISP_ADJUSTED_i8]], i32 -4
+// CHECK: call x86_thiscallcc void @"\01?f@D@@UAEXXZ"(i8* %[[ADJUSTED_i8]])
+// CHECK: ret void
+
+struct E : virtual A {
+ virtual void f();
+ ~E();
+};
+
+struct F {
+ virtual void z();
+};
+
+struct G : virtual F, virtual E {
+ int ggg;
+ G();
+ ~G();
+};
+
+G::G() {} // Forces vftable emission.
+
+// CHECK-LABEL: define weak x86_thiscallcc void @"\01?f@E@@$R4BA@M@PPPPPPPM@7AEXXZ"(i8*)
+// CHECK: %[[ECX:.*]] = load %struct.E** %{{.*}}
+// CHECK: %[[ECX_i8:.*]] = bitcast %struct.E* %[[ECX]] to i8*
+// CHECK: %[[VTORDISP_PTR_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 -4
+// CHECK: %[[VTORDISP_PTR:.*]] = bitcast i8* %[[VTORDISP_PTR_i8]] to i32*
+// CHECK: %[[VTORDISP:.*]] = load i32* %[[VTORDISP_PTR]]
+// CHECK: %[[VTORDISP_NEG:.*]] = sub i32 0, %[[VTORDISP]]
+// CHECK: %[[VTORDISP_ADJUSTED_i8:.*]] = getelementptr i8* %[[ECX_i8]], i32 %[[VTORDISP_NEG]]
+// CHECK: %[[VBPTR_i8:.*]] = getelementptr inbounds i8* %[[VTORDISP_ADJUSTED_i8]], i32 -16
+// CHECK: %[[VBPTR:.*]] = bitcast i8* %[[VBPTR_i8]] to i8**
+// CHECK: %[[VBTABLE:.*]] = load i8** %[[VBPTR]]
+// CHECK: %[[VBOFFSET_PTR_i8:.*]] = getelementptr inbounds i8* %[[VBTABLE]], i32 12
+// CHECK: %[[VBOFFSET_PTR:.*]] = bitcast i8* %[[VBOFFSET_PTR_i8]] to i32*
+// CHECK: %[[VBASE_OFFSET:.*]] = load i32* %[[VBOFFSET_PTR]]
+// CHECK: %[[VBASE:.*]] = getelementptr inbounds i8* %[[VBPTR_i8]], i32 %[[VBASE_OFFSET]]
+// CHECK: %[[ARG_i8:.*]] = getelementptr i8* %[[VBASE]], i32 8
+// CHECK: call x86_thiscallcc void @"\01?f@E@@UAEXXZ"(i8* %[[ARG_i8]])
+// CHECK: ret void