How to return an array from a function with the same name as that of the function in system verilog? - system-verilog

Question

module rev_array;
int array_in[10]={0,1,2,3,4,5,6,7,8,9};
typedef integer array[9:0];
function array reverse(int array_in[10]);
for(int j=$size(array_in)-1,int i=0;j>=0;j--,i++)
begin
reverse[j]=array_in[i];
end
// working for(integer k=0;k<$size(array_in)-1;k++)
// working $display("reverse[%0d]:%0d", k, reverse[k]);
$display("inside function");
endfunction:reverse
initial
begin
reverse(array_in);
for(integer k=0;k<$size(array_in)-1;k++)
begin
$display("reverse[%0d]:%0d", k, reverse[k]);
end
end
endmodule
Error-[IUS] Illegal use of scope
testbench.sv, 22
rev_array, "rev_array.reverse"
Scope cannot be used in this context
Error-[XMRIBS] Illegal bit select
testbench.sv, 22
Error is found in following cross-module reference, illegal bit select on
the target.
Source info: $display("reverse[%0d]:%0d", k, rev_array.reverse[k]);
I am trying to reverse an array and return it in system verilog function, I am able to see the reversed array inside the function by printing it but
when I try to print it using $display outside the function, I think it is
not being returned properly somehow, in the 4th line from end, getting
errorError-[IUS]

Answer 1

your both issues are related to the line where you use reverse function name as an array within $display.
$display("reverse[%0d]:%0d", k, reverse[k]);
--------------------------------^^^^^^^^^^
this is an illegal syntax causing both messages.
your initial block should look like the following.
initial
begin
array result;
result = reverse(array_in);
//^^^^^^^^^^^^^^^^^^^^^^^^^//
for(integer k=0;k<$size(array_in)-1;k++)
begin
$display("reverse[%0d]:%0d", k, result[k]);
// ^^^^^^ //
end
end
call the function and use returned results for display.