Question

SystemVerilog:

typedef struct {int a; bit [6:1][1:8] b [65:2]; int c;} triple;
// troublesome mix of C types and packed arrays
import "DPI" function void foo(input triple i);
export "DPI" function exported_sv_func;
function void exported_sv_func(input int i, output logic [63:0] o);
begin ... end
endfunction

C:

#include "svdpi.h"
#include "svdpi_src.h"
typedef struct {
int a;
sv_BIT_PACKED_ARRAY(6*8, b) [64]; /* implementation specific
representation */
int c;
} triple;
/* Note that ’b’ is defined as for ’bit [6*8-1:0] b [63:0]’ */
extern void exported_sv_func(int, svLogicPackedArrRef); /* imported from
SystemVerilog */
void foo(const triple *i)
{
int j;
/* canonical representation */
svBitVec32 arr[SV_CANONICAL_SIZE(6*8)]; /* 6*8 packed bits */
svLogicVec32 aL[SV_CANONICAL_SIZE(64)];
/* implementation specific representation */
SV_LOGIC_PACKED_ARRAY(64, my_tab);
printf("%d %d\n", i->a, i->c);
for (j=0; j<64; j++) {
svGetBitVec32(arr, (svBitPackedArrRef)&(i->b[j]), 6*8);
...
}
...
/* call SystemVerilog */
exported_sv_func(2, (svLogicPackedArrRef)&my_tab); /* by reference */
svGetLogicVec32(aL, (svLogicPackedArrRef)&my_tab, 64); ... }

NOTE—a, b, and c are directly accessed as fields in a structure. In the case of b, which represents unpacked array of packed arrays, the individual element is accessed via the library function svGetBitVec32(), by passing its address to the function.