1 files changed, 101 insertions, 0 deletions
diff --git a/test/CodeGenCXX/microsoft-abi-vmemptr-conflicts.cpp b/test/CodeGenCXX/microsoft-abi-vmemptr-conflicts.cpp
new file mode 100644
index 0000000..35ff4f3
--- /dev/null
+++ b/test/CodeGenCXX/microsoft-abi-vmemptr-conflicts.cpp
@@ -0,0 +1,101 @@
+// RUN: %clang_cc1 -fno-rtti -emit-llvm -triple=i386-pc-win32 %s -o - | FileCheck %s
+
+// In each test case, we have two member pointers whose thunks have the same
+// vtable offset and same mangling, but their prototypes conflict.  The
+// arguments and return type may differ.  Therefore, we have to bitcast the
+// function prototype.  Unfortunately, if the return types differ, LLVM's
+// optimizers can get upset.
+
+namespace num_params {
+struct A { virtual void a(int); };
+struct B { virtual void b(int, int); };
+struct C : A, B {
+  virtual void a(int);
+  virtual void b(int, int);
+};
+void f(C *c) {
+  (c->*(&C::a))(0);
+  (c->*(&C::b))(0, 0);
+}
+}
+
+// CHECK-LABEL: define void @"\01?f@num_params@@YAXPAUC@1@@Z"(%"struct.num_params::C"* %c)
+// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0)
+// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0, i32 0)
+
+// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@num_params@@$BA@AE"(%"struct.num_params::C"* %this, ...)
+// CHECK: musttail call x86_thiscallcc void (%"struct.num_params::C"*, ...)* %{{.*}}(%"struct.num_params::C"* %{{.*}}, ...)
+// CHECK-NEXT: ret void
+
+namespace i64_return {
+struct A { virtual int a(); };
+struct B { virtual long long b(); };
+struct C : A, B {
+  virtual int a();
+  virtual long long b();
+};
+long long f(C *c) {
+  int x = (c->*(&C::a))();
+  long long y = (c->*(&C::b))();
+  return x + y;
+}
+}
+
+// CHECK-LABEL: define i64 @"\01?f@i64_return@@YA_JPAUC@1@@Z"(%"struct.i64_return::C"* %c)
+// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i32 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
+// CHECK: call x86_thiscallcc i64 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i64 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
+
+// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@i64_return@@$BA@AE"(%"struct.i64_return::C"* %this, ...)
+// CHECK: musttail call x86_thiscallcc void (%"struct.i64_return::C"*, ...)* %{{.*}}(%"struct.i64_return::C"* %{{.*}}, ...)
+// CHECK-NEXT: ret void
+
+namespace sret {
+struct Big { int big[32]; };
+struct A { virtual int a(); };
+struct B { virtual Big b(); };
+struct C : A, B {
+  virtual int a();
+  virtual Big b();
+};
+void f(C *c) {
+  (c->*(&C::a))();
+  Big b((c->*(&C::b))());
+}
+}
+
+// CHECK-LABEL: define void @"\01?f@sret@@YAXPAUC@1@@Z"(%"struct.sret::C"* %c)
+// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to i32 (%"struct.sret::C"*)*)(%"struct.sret::C"* %{{.*}})
+// CHECK: call x86_thiscallcc void bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to void (%"struct.sret::C"*, %"struct.sret::Big"*)*)(%"struct.sret::C"* %{{.*}}, %"struct.sret::Big"* sret %{{.*}})
+
+// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@sret@@$BA@AE"(%"struct.sret::C"* %this, ...)
+// CHECK: musttail call x86_thiscallcc void (%"struct.sret::C"*, ...)* %{{.*}}(%"struct.sret::C"* %{{.*}}, ...)
+// CHECK-NEXT: ret void
+
+namespace cdecl_inalloca {
+// Fairly evil, since now we end up doing an inalloca-style call through a
+// thunk that doesn't use inalloca.  Hopefully the stacks line up?
+struct Big {
+  Big();
+  ~Big();
+  int big[32];
+};
+struct A { virtual void __cdecl a(); };
+struct B { virtual void __cdecl b(Big); };
+struct C : A, B {
+  virtual void __cdecl a();
+  virtual void __cdecl b(Big);
+};
+void f(C *c) {
+  Big b;
+  (c->*(&C::a))();
+  ((c->*(&C::b))(b));
+}
+}
+
+// CHECK-LABEL: define void @"\01?f@cdecl_inalloca@@YAXPAUC@1@@Z"(%"struct.cdecl_inalloca::C"* %c)
+// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AE" to void (%"struct.cdecl_inalloca::C"*)*)(%"struct.cdecl_inalloca::C"* %{{.*}})
+// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AE" to void (<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>*)*)(<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>* inalloca %{{.*}})
+
+// CHECK-LABEL: define linkonce_odr void @"\01??_9C@cdecl_inalloca@@$BA@AE"(%"struct.cdecl_inalloca::C"* %this, ...)
+// CHECK: musttail call void (%"struct.cdecl_inalloca::C"*, ...)* %{{.*}}(%"struct.cdecl_inalloca::C"* %{{.*}}, ...)
+// CHECK-NEXT: ret void