Manipulating Strings Using DPI

I'm sharing this code. This is an example of passing strings back and forth from SystemVerilog and DPI. Some of these features aren't available until IUS6.0. ----file top.v-------- module top (); import "DPI-C" context pass_string_c= task pass_string_sv(input string a); import "DPI-C" context string_c2v_c= function string string_c2v_sv(); string some_string; // This doesnt work in IUS583, will work in IUS6.0 export "DPI-C" print_string_c = function print_string_sv; function void print_string_sv(input string aaa); $display("Exported Verilog String= %s", aaa); endfunction initial begin some_string = "pass it ON"; // enable when running IUS6.0 pass_string_sv(some_string); // pass string to C $display("Verilog: %s \n", string_c2v_sv() ); // get string from C $finish; end endmodule -----file main_task.c----- #include #include // to use io_printf (prints to ncsim.log) #include void pass_string_c(const char* a) { io_printf("DPI: %s\n", a); // now call exported function print_string_c("string passed from C"); // This wont work in IUS583 } const char* string_c2v_c(void) { io_printf("C: give up a string\n"); return "Gimme String"; } -----file: RUN_NC (script)------ rm -r INCA_libs rm *.so rm *.log rm *.h # Create .h file for Exported tasks/functions only # (imported function do NOT need .h file): ncverilog +sv top.v +ncdpiheader+dpi.h +elaborate +ncelabargs+-messages # ncvlog -sv top.v -mess # ncelab top -sv -dpiheader dpi.h -mess gcc -fPIC -shared -o main_task.so main_task.c -I/`ncroot`/tools/inca/include ncverilog +sv top.v +sv_lib=main_task.so +access+r +ncsimargs+"-sv_root ./" ----file: ncverilog.log (IUS6.02)----------- ncsim> run DPI: pass it ON Exported Verilog String= string passed from C Verilog: C: give up a string Gimme String Simulation complete via $finish(1) at time 0 FS + 0 ./top.v:22 $finish; ncsim> exit