Return struct/string from C to SV

UVM
, ,
1

I have a question

1# I want to return a structure from c-model to the SV my structure is here
In SV:

typedef struct {
  string res_data;
  string res_add;
}rfi;

In C:

typedef struct {
  char res_data[32];
  char res_add[32];
}rfi;

and imported in SV using
import “DPI-C” function rfi ref_model(string inst);

I’m getting an error says “unpacked struct can’t be return type”
So when I use
In SV:
typedef struct packed{
string res_data;
string res_add;
}rfi;
getting error:“string can’t be in packed struct”

2# How to return a string type to SV from C?
i’m using::
import “DPI-C” function string ref_model(string inst);
string result;
result=ref_model(inst);
when I print result the simulator(VCS) gets terminating without printing the result…

appreciate if any experts help me, thank you.

2

SystemVerilog only allows singular types (packed, real, ints) as return types. Dynamically sized types like strings must be passed in a way that memory management is kept independent on both sides of the DPI interface. This is a very advanced topic and you should consult with your vendor for additional help.