ABI-Testsuite/test/misc/vc2.xpp

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// RUN: cxx_compiler -c %s cxx_rtti -o %t1.o
// RUN: linker -o %t%exeext %t1.o
// RUN: runtool %t%exeext | grep "PASSED"

// test case from ABI testsuite
#include "../common/select2.h"
/*
Test case for sharing virtual bases.
In Most_Derived,
the primary base class is Nonvirt1,
Nonvirt2 and Nonvirt3 share vptrs with
virtual base Shared_Virt.  Shared_Virt
should be at the same offset as Nonvirt2.
Should get:
67% a.out
(long)(Nonvirt1 *)dd - (long)dd = 0
(long)(Nonvirt2 *)dd - (long)dd = 8
(long)(Nonvirt3 *)dd - (long)dd = 16
(long)(Shared_Virt *)dd - (long)dd = 8
*/

struct Shared_Virt {
    virtual void foo();
};
struct Nonvirt2 : virtual Shared_Virt {
        virtual void bar();
};
struct Nonvirt3 : virtual Shared_Virt {
        virtual void baz();
};
struct Nonvirt1 {
        virtual void foo();
};

struct Most_Derived : Nonvirt1, Nonvirt2, Nonvirt3 {
        virtual void bar();
};

void Shared_Virt::foo() { }
void Nonvirt2::bar() { }
void Nonvirt3::baz() { }
void Nonvirt1::foo() { }
void Most_Derived::bar() { }

extern "C" int printf(const char *,...);
//#define EVAL(EXPR) printf( #EXPR " = %d\n", (EXPR) );

static int nerr;
static void evalf(int expected, const char *str, int val)
{
  expected /= LPSELECT(1,2); //representing the size difference of pointers
  if (expected != val) {
    printf("ERROR: expected %d. ", expected);
    nerr++;
  }
  printf(str, val);
}
#define EVAL(v,EXPR) evalf(v,  #EXPR " = %d\n", (int) (EXPR) );

int main()
{
  Most_Derived *dd = new Most_Derived;
  EVAL(0, (long)(Nonvirt1 *)dd - (long)dd);
  EVAL(8, (long)(Nonvirt2 *)dd - (long)dd);
  EVAL(16, (long)(Nonvirt3 *)dd - (long)dd);
  EVAL(8, (long)(Shared_Virt *)dd - (long)dd);
  printf("%s\n", nerr ? "FAILED" : "PASSED");
  
}