llvm/clang/test/CodeGenCXX/microsoft-abi-vmemptr-conflicts.cpp

// 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 dso_local void @"?f@num_params@@YAXPAUC@1@@Z"(ptr noundef %c)
// CHECK: call x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, i32 noundef 0)
// CHECK: call x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, i32 noundef 0, i32 noundef 0)

// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
// 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 dso_local noundef i64 @"?f@i64_return@@YA_JPAUC@1@@Z"(ptr noundef %c)
// CHECK: call x86_thiscallcc noundef i32 @"??_9C@i64_return@@$BA@AE"(ptr {{[^,]*}} %{{.*}})
// CHECK: call x86_thiscallcc noundef i64 @"??_9C@i64_return@@$BA@AE"(ptr {{[^,]*}} %{{.*}})

// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@i64_return@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
// 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 dso_local void @"?f@sret@@YAXPAUC@1@@Z"(ptr noundef %c)
// CHECK: call x86_thiscallcc noundef i32 @"??_9C@sret@@$BA@AE"(ptr {{[^,]*}} %{{.*}})
// CHECK: call x86_thiscallcc void @"??_9C@sret@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, ptr dead_on_unwind writable sret(%"struct.sret::Big") align 4 %{{.*}})

// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@sret@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
// 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 dso_local void @"?f@cdecl_inalloca@@YAXPAUC@1@@Z"(ptr noundef %c)
// CHECK: call void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr {{[^,]*}} %{{.*}})
// CHECK: call void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr inalloca(<{ ptr, %"struct.cdecl_inalloca::Big" }>) %{{.*}})

// CHECK-LABEL: define linkonce_odr void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr noundef %this, ...) {{.*}} comdat
// CHECK: musttail call void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
// CHECK-NEXT: ret void