SystemVerilog LRM 有一些示例展示了如何通过 DPI-C 层将 SystemVerilog 中的结构传递给\from C。但是,当我尝试自己的示例时,它似乎在 Incisive 或 Vivado 模拟器中根本不起作用(它在 ModelSim 中确实起作用)。我想知道我是否做错了什么,或者这是否是模拟器的问题。我的例子如下:
#include <stdio.h>
typedef struct {
char f1;
int f2;
} s1;
void SimpleFcn(const s1 * in,s1 * out){
printf("In the C function the struct in has f1: %d\n",in->f1);
printf("In the C function the struct in has f2: %d\n",in->f2);
out->f1=!(in->f1);
out->f2=in->f2+1;
}
我将上面的代码编译成一个共享库:
gcc -c -fPIC -Wall -ansi -pedantic -Wno-long-long -fwrapv -O0 dpi_top.c -o dpi_top.o
gcc -shared -lm dpi_top.o -o dpi_top.so
和 SystemVerilog 代码:
`timescale 1ns / 1ns
typedef struct {
bit f1;
int f2;
} s1;
import "DPI-C" function void SimpleFcn(input s1 in,output s1 out);
module top();
s1 in,out;
initial
begin
in.f1=1'b0;
in.f2 = 400;
$display("The input struct in SV has f1: %h and f2:%d",in.f1,in.f2);
SimpleFcn(in,out);
$display("The output struct in SV has f1: %h and f2:%d",out.f1,out.f2);
end
endmodule
在 Incisive 中,我使用 irun 运行它:
irun -sv_lib ./dpi_top.so -sv ./top.sv
但它是 SegV 的。
在 Vivado 中,我使用
xvlog -sv ./top.sv
xelab top -sv_root ./ -sv_lib dpi_top.so -R
它运行良好,直到退出模拟,然后出现内存损坏:
Vivado Simulator 2017.4
Time resolution is 1 ns
run -all
The input struct in SV has f1: 0 and f2: 400
In the C function the struct in has f1: 0
In the C function the struct in has f2: 400
The output struct in SV has f1: 1 and f2: 401
exit
*** Error in `xsim.dir/work.top/xsimk': double free or corruption (!prev): 0x00000000009da2c0 ***