Simple Import-Export Flow (Illustrates xelab -dpiheader Flow) - 2021.2 English

In this flow:

1. Run xelab with the -dpiheader switch to create the header file, file.h.
2. Your code in file.c then includes the xelab-generated header file (file.h), which is listed at the end.
3. Compile the code in file.c and test.sv as before to generate the simulation executable.

file.c

#include "file.h"
/* NOTE: This file is generated by xelab -dpiheader <filename> flow */
int cfunc (int a, int b) {
//Call the function exported from SV.
return c_exported_func (a,b);
}

test.sv

module m();
export "DPI-C" c_exported_func = function func;
import "DPI-C" pure function int cfunc (input int a ,b);
/*This function can be called from both SV or C side. */
function int func(input int x, y);
begin
func = x + y;
end
endfunction
int z;
initial
begin
#5;
z = cfunc(2, 3);
if(z == 5)
$display("PASSED");
else
$display("FAILED");
end
endmodule

run.ksh

xelab -dpiheader file.h -svlog test.sv
xsc file.c
xelab -svlog test.sv -sv_lib dpi -R
file.h
/**********************************************************************/
/* ____ ____ */
/* / /\/ / */
/* /___/ \ / */
/* \ \ \/ */
/* \ \ Copyright (c) 2003-2013 Xilinx, Inc. */
/* / / All Right Reserved. */
/* /---/ /\ */
/* \ \ / \ */
/* \___\/\___\ */
/**********************************************************************/
/* NOTE: DO NOT EDIT. AUTOMATICALLY GENERATED FILE. CHANGES WILL BE LOST. */
#ifndef DPI_H
#define DPI_H
#ifdef __cplusplus
#define DPI_LINKER_DECL extern "C"
#else
#define DPI_LINKER_DECL
#endif
#include "svdpi.h"
/* Exported (from SV) function */
DPI_LINKER_DECL DPI_DLLISPEC
int c_exported_func(
int x, int y);
/* Imported (by SV) function */
DPI_LINKER_DECL DPI_DLLESPEC
int cfunc(
int a, int b);
#endif