Question on DPI - System Verilog

SystemVerilog
1

EDA Playground environment

I am getting an error when I run it.

Can I know the reason?

2

In reply to Vinay Reddy:

When coding with C++, you need to provide a function prototype that is compatible with C:

example.cpp

#include "stdio.h"
#include "svdpi.h"
extern "C" int shift_c (const svBitVecVal *i, int n);

int shift_c (const svBitVecVal *i, int n) 
{
  if (n < 0)
    return (*i >> (n *-1));
  else if (n > 0)
    return (*i << n);
  else
    return *i;
}
3

In reply to cgales:

BTW, note that some tools have automatic DPI header files that create generate prototype header files that you can include in your C/C++ file. This catches prototype mismatches at the the compile step instead of waiting until runtime. On EDAPlayground, if you add
-dpiheader dpi.h to the command line, and then
include “dpi.h” to the C file, that eliminates this error.