test/CodeGenCXX/class-layout.cpp

// RUN: %clang_cc1 %s -triple x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s

// An extra byte should be allocated for an empty class.
namespace Test1 {
  // CHECK: %"struct.Test1::A" = type { i8 }
  struct A { } *a;
}

namespace Test2 {
  // No need to add tail padding here.
  // CHECK: %"struct.Test2::A" = type { i8*, i32 }
  struct A { void *a; int b; } *a;
}

namespace Test3 {
  // C should have a vtable pointer.
  // CHECK: %"struct.Test3::A" = type { i32 (...)**, i32 }
  struct A { virtual void f(); int a; } *a;
}

namespace Test4 {
  // Test from PR5589.
  // CHECK: %"struct.Test4::B" = type { %"struct.Test4::A", i16, double }
  // CHECK: %"struct.Test4::A" = type { i32, i8, float }
  struct A {
    int a;
    char c;
    float b;
  };
  struct B : public A {
    short d;
    double e;
  } *b;
}

namespace Test5 {
  struct A {
    virtual void f();
    char a;
  };

  // CHECK: %"struct.Test5::B" = type { [9 x i8], i8, i8, [5 x i8] }
  struct B : A {
    char b : 1;
    char c;
  } *b;
}