PAssing array of structures from C to SV

SystemVerilog
,
1

Does any one has an example on passing array of structures from C to SystemVerilog using DPI?

2

In reply to superUVM:

SystemVerilog code:

module top;
   typedef struct {int A; byte B; int C; } my_struct_t;
   typedef my_struct_t my_struct_array_t[2];
   import "DPI-C" function void pass_struct(output my_struct_array_t a);

   my_struct_array_t SA;

   initial begin
      pass_struct(SA);
      $display("%p",SA);
   end
endmodule // top

C code:

#include "dpicstruct.h"

void pass_struct( my_struct_t* a) {
  int i=0;
  a[0].A = i++;
  a[0].B = i++;
  a[0].C = i++;
  a[1].A = i++;
  a[1].B = i++;
  a[1].C = i++;
}

dpicstruct.h (generated automatically)

/ * Copyright 2002-2019 Mentor Graphics Corporation.
 *
 * Note:
 *   This file is automatically generated.
 *   Please do not edit this file - you will lose your edits.
 *
 * Settings when this file was generated:
 *   PLATFORM = 'linux_x86_64'
 */
#include "svdpi.h"
typedef struct {
    int A;
    char B;
    int C;
}  my_struct_t;

void
pass_struct(
    my_struct_t* a);

Displays:

# '{'{A:0, B:1, C:2}, '{A:3, B:4, C:5}}
3

In reply to dave_59:

Hi Dave,
Thanks for example. When I compile, I get this error, “unsupported datatype in formal argument” and referring to argument my_struct_array_t.

Thanks.

4

In reply to superUVM:

An “unsupported” message usually means the tool reconizes the construct, but has not implemented it yet. Please contact your tool vendor.