interface Int(); class t1; integer a[string]; function new; a["a"] =40; a["b"] =60; a["c"] =80; endfunction endclass class t2; integer b[string]; function new; b["aa"] =44; b["bb"] =66; b["cc"] =88; endfunction endclass t1 inst1 =new; t2 inst2 =new; endinterface module top; Int in(); virtual Int testint =in; integer array[string]; initial begin #1; array =testint.inst1.a; $display("testint.inst1.a =%p", testint.inst1.a); $display("array = %p", array); #2; array =testint.inst2.b; $display("testint.inst2.b =%p", testint.inst2.b); $display("array =%p", array); end
时间: 2024-04-28 08:20:08 浏览: 182
这段代码是 SystemVerilog 语言的代码,主要使用了面向对象的编程方式。
首先定义了一个接口 `Int`,并在其中声明了两个类 `t1` 和 `t2`,它们分别包含了一个字符串索引为下标的整型数组 `a` 和 `b`。在每个类中还定义了一个构造函数 `new`,在这个函数中对数组进行了初始化操作。
然后在模块 `top` 中,实例化了 `Int` 接口,并通过 `virtual` 关键字声明了一个虚拟函数 `testint`,它返回了一个 `Int` 接口类型的对象。在 `top` 模块中还定义了一个字符串索引为下标的整型数组 `array`。
最后,在 `initial` 块中,通过调用 `testint` 函数获取了 `Int` 接口类型的对象,并分别将 `testint.inst1.a` 和 `testint.inst2.b` 赋值给了 `array` 数组。然后通过 `$display` 函数输出了两个数组的值。
整个代码的作用是,通过面向对象的方式定义了两个类和一个接口,并在模块中实例化了该接口,通过调用虚拟函数获取了两个类的对象,并将其数组的值输出。
相关问题
interface Int(); class t1; integer a[string]; //REQ-EXT-10007 function new; //class constructor body need be modified according to REQ-EXT-10007 a["a"] =40; a["b"] =60; a["c"] =80; endfunction endclass class t2; integer b[string]; //REQ-EXT-10007 function new; //class constructor body need be modified according to REQ-EXT-10007 b["aa"] =44; b["bb"] =66; b["cc"] =88; endfunction endclass t1 inst1 =new; //REQ-EXT-10501 t2 inst2 =new; //REQ-EXT-10501 endinterface module top; Int in(); virtual Int testint =in; integer array[string]; //data type of array need be modified according to REQ-EXT-10007 initial begin #1; array =testint.inst1.a; $display("testint.inst1.a =%p", testint.inst1.a); //CHECK-001:'{"a":40, "b":60, "c":80} $display("array = %p", array); //CHECK-002:'{"a":40, "b":60, "c":80} #2; array =testint.inst2.b; $display("testint.inst2.b =%p", testint.inst2.b); //CHECK-003:'{"aa":44, "bb":66,"cc":88} $display("array =%p", array); //CHECK-004:'{"aa":44, "bb":66,"cc":88} end 如果改变数据类型,如何修改才能使这段代码仍然跑通呢?
如果需要改变数据类型,可以将 `integer array[string]` 修改为 `int array[$]`,以支持任意数据类型的数组。修改后的代码如下:
```verilog
interface Int();
class t1;
int a[string]; // 修改数据类型为 int
function new;
a["a"] = 40;
a["b"] = 60;
a["c"] = 80;
endfunction
endclass
class t2;
int b[string]; // 修改数据类型为 int
function new;
b["aa"] = 44;
b["bb"] = 66;
b["cc"] = 88;
endfunction
endclass
t1 inst1 = new();
t2 inst2 = new();
endinterface
module top();
Int in();
virtual Int testint = in;
int array[$]; // 修改数据类型为 int 且支持任意数据类型的数组
initial begin
#1;
array = testint.inst1.a;
$display("testint.inst1.a = %p", testint.inst1.a);
$display("array = %p", array);
#2;
array = testint.inst2.b;
$display("testint.inst2.b = %p", testint.inst2.b);
$display("array = %p", array);
end
endmodule
```
interface Int(); class t1; integer a[string]; //REQ-EXT-10007 function new; //class constructor body need be modified according to REQ-EXT-10007 a = '{"a":40, "b":60, "c":80}'; endfunction endclass class t2; integer b[string]; //REQ-EXT-10007 function new; //class constructor body need be modified according to REQ-EXT-10007 b = '{"aa":44, "bb":66,"cc":88}'; endfunction endclass t1 inst1 = new; //REQ-EXT-10501 t2 inst2 = new; //REQ-EXT-10501 endinterface module top; Int in(); virtual Int testint = in; associative array[string] array; initial begin #1; array = testint.inst1.a; $display("testint.inst1.a = %p", testint.inst1.a); //CHECK-001:'{"a":40, "b":60, "c":80} $display("array = %p", array); //CHECK-002:'{"a":40, "b":60, "c":80} #2; array = testint.inst2.b; $display("testint.inst2.b = %p", testint.inst2.b); //CHECK-003:'{"aa":44, "bb":66,"cc":88} $display("array = %p", array); //CHECK-004:'{"aa":44, "bb":66,"cc":88} end endmodule this piece of system verilog code, when compiled by vcs, will report syntax error:38: token is 'array', how should I fix this syntax error? thanks a lot
The syntax error is caused by the use of reserved keyword "array" as a variable name. To fix this error, you can rename the variable "array" to something else, such as "my_array". Here's an updated version of the code:
```
interface Int();
class t1;
integer a[string]; //REQ-EXT-10007
function new; //class constructor body need be modified according to REQ-EXT-10007
a = '{"a":40, "b":60, "c":80}';
endfunction
endclass
class t2;
integer b[string]; //REQ-EXT-10007
function new; //class constructor body need be modified according to REQ-EXT-10007
b = '{"aa":44, "bb":66,"cc":88}';
endfunction
endclass
t1 inst1 = new; //REQ-EXT-10501
t2 inst2 = new; //REQ-EXT-10501
endinterface
module top;
Int in();
virtual Int testint = in;
associative my_array[string]; // Renamed variable "array" to "my_array"
initial begin
#1;
my_array = testint.inst1.a;
$display("testint.inst1.a = %p", testint.inst1.a); //CHECK-001:'{"a":40, "b":60, "c":80}
$display("my_array = %p", my_array); //CHECK-002:'{"a":40, "b":60, "c":80}
#2;
my_array = testint.inst2.b;
$display("testint.inst2.b = %p", testint.inst2.b); //CHECK-003:'{"aa":44, "bb":66,"cc":88}
$display("my_array = %p", my_array); //CHECK-004:'{"aa":44, "bb":66,"cc":88}
end
endmodule
```
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