How to export the dpi function between c and sv

SystemVerilog
,
7

In reply to dave_59:

Hi Dave,

I was not able to solve this problem in my side. And I tried another way to implement it but failed at below error. I am not sure if I use the dpi correctly or not. Could you please take a look ?

I don’t use ‘export’ function and what I tried is shown below.

/proj/common/my_globals.svh:


typedef struct {
    string name;
    uint32 addr;
} reg_t;
 
import "DPI-C" context function void get_all_reg2(output reg_t arr[]);

and here is my c file: (proj/common/get_all_reg.cpp)
[c]
struct reg_t{
const char* name;
uint32 addr;
};

extern “C” {
void get_all_reg2(svOpenArrayHandle arr) {

reg_t  reg_element;
reg_t *reg_array;
reg_array = (reg_t*)svGetArrayPtr(arr);

while(...) {
  ...
  reg_array[idx] = reg_element;
  idx++;
}

}
} // extern “C”
[/c]

and then in my test file (/proj/test/my_test2.svh), I will invoke the get_all_reg2() function as shown below.


class my_test2 extends uvm_test;
  ...
  reg_t m_reg_array[1024];      // shall we need to identify 1024 ?
  ...
  task run_phase(uvm_phase phase);
    super.run_phase(phase);
    phase.raise_objection(this, "raise objection");
    get_all_reg2(m_reg_array);
    ...
  endtask
endclass

and I met the segmentation fault…