日常记录（25）类copy、虚类、约束等
类copy、虚类等
虚类，以下代码中若基类没有virtual声明，则输出全为基类的disp调用。
copy函数是手动实现的。有必要的时候内部实现一个copy_data函数辅助。
class ClassTest;
// data or class properties
static int count=0;
int id;
// initialization
function new();
id=count++;
endfunction : new
endclass : ClassTest
class ClsBase;
// data or class properties
static string base_name="cls_base name";
int a;
int b;
ClassTest ct=new;
// initialization
function new();
a=1;
b=2;
endfunction : new
function ClsBase copy();
ClsBase cb=new;
cb.a=a;
cb.b=b;
cb.ct = new ct;
return cb;
endfunction: copy
virtual function void disp();
$display("this is a ClsBase display");
endfunction: disp
endclass : ClsBase
class ClsA extends ClsBase;
// data or class properties
// initialization
function new();
super.new();
endfunction : new
virtual function void disp();
$display("this is a ClsA display");
endfunction: disp
endclass : ClsA
class ClsB extends ClsBase;
// data or class properties
int bb;
// initialization
function new();
super.new;
bb=1;
endfunction : new
function void disp();
$display("this is a ClsB display");
endfunction: disp
endclass : ClsB
module taa ();
initial begin
ClassTest array_c[10];
for(int i=0;i<10;i++) begin
array_c[i]=new;
$display("c1.id is %d", array_c[i].id);
end
end
initial begin
ClsBase cb=new;
ClsBase cb2;
ClsBase cb3;
ClsA cla;
ClsB clb;
ClsBase clta;
ClsBase cltb;
cb2=new cb;
cb2.a=111;
cb2.ct.id=66;
$display("cb.a is %d", cb.a);
$display("cb.ct.id is %d", cb.ct.id);
$display("cb2.a is %d", cb2.a);
$display("cb2.ct.id is %d", cb2.ct.id);
cb3=cb.copy();
$display("cb3.ct.id is %d", cb3.ct.id);
cb3.ct.id=12;
$display("cb.ct.id is %d", cb.ct.id);
$display("cb3.ct.id is %d", cb3.ct.id);
cla=new;
clb=new;
clta=cla;
cltb=clb;
clta.disp();
cltb.disp();
end
endmodule
输出
c1.id is 1 c1.id is 2 c1.id is 3 c1.id is 4 c1.id is 5 c1.id is 6 c1.id is 7 c1.id is 8 c1.id is 9 c1.id is 10 cb.a is 1 cb.ct.id is 66 cb2.a is 111 cb2.ct.id is 66 cb3.ct.id is 66 cb.ct.id is 66 cb3.ct.id is 12 this is a ClsA display this is a ClsB display
系统时间、randc语法、$fatal、$system等
module tbb ();
longint time_info;
function func_rand;
int fd;
int cut_time;
begin
$display("system time is %d", $system("date +%s%N"));
$system("date +%s%N > localtime.tmp");
fd=$fopen("localtime.tmp", "r");
cut_time=$fscanf(fd, "%d",time_info);
$fclose(fd);
$system("rm -f localtime.tmp");
$display("cut time is %d", cut_time);
$display("system time is %d", time_info);
end
endfunction
function void statistic(int arr[]);
int arr_u[int];
foreach(arr[i])
if(arr_u[arr[i]]==null)
arr_u[arr[i]]=1;
else
arr_u[arr[i]]++;
foreach(arr_u[i])
$display("the final statistic %0d, count:%0d", i,arr_u[i]);
endfunction: statistic
class ModCls;
// data or class properties
rand reg [3:0] y;
randc bit [1:0] z;
constraint c1 {y>2; y<10;}
// initialization
function new();
endfunction : new
endclass : ModCls
initial begin
int a[10000];
ModCls mc;
$display("before seed is %d", time_info);
func_rand;
$display("after seed is %d", time_info);
for (int i = 0; i < 1000; i++) begin
mc = new;
//mc.srandom(time_info);
mc.randomize();
a[i]=mc.y;
end
statistic(a);
$display("the randc value is ");
for (int i = 0; i < 20; i++) begin
mc=new;
assert(mc.randomize())
else $fatal(0, "random ranc failed!");
$write(" %d", mc.z);
end
$display();
$display("the randc value is ");
mc=new;
for (int i = 0; i < 20; i++) begin
assert(mc.randomize())
else $fatal(0, "random ranc failed!");
$write(" %d", mc.z);
end
$display();
end
initial begin
$display("random seed : %d", $random());
$display("random seed : %d", $random());
$display("random seed : %d", $random());
$display("random seed : %d", {$random()});
$display("random seed : %d", {$random()});
$display("random seed : %d", {$random()});
$display("random seed : %d", {$random()});
end
endmodule
fscanf可能返回读取到的数据个数、$system输出的信息返回值为0表示命令执行成功，获取内容需要进行文件读写。
输出
before seed is 0 1640753939063821762 system time is 0 cut time is 1 system time is 1640753939065530219 after seed is 1640753939065530219 the final statistic 0, count:9000 the final statistic 3, count:136 the final statistic 4, count:155 the final statistic 5, count:136 the final statistic 6, count:163 the final statistic 7, count:147 the final statistic 8, count:134 the final statistic 9, count:129 the randc value is 0 2 1 2 3 0 2 1 3 3 1 1 2 2 2 0 1 0 1 1 the randc value is 1 0 2 3 3 1 2 0 3 0 2 1 0 2 3 1 0 1 2 3 random seed : 303379748 random seed : -1064739199 random seed : -2071669239 random seed : 2985317987 random seed : 112818957 random seed : 1189058957 random seed : 2999092325
类的约束、虚类、inside、srandom等
virtual class ClassCons;
// data or class properties
rand int a[10];
local int b;
constraint c1 {
a[0] dist{0:=1, [1:10]:=10};
a[1] dist{0:=1, [1:10]:/10};
a[2] inside{1, 2};
a[3] >10;
a[3] <=13;
a[4] >=0;
a[4] <=5;
a[3]==11 -> a[4]==1;
a[3]==12 -> a[4]==3;
a[5] >10;
a[5] <=13;
a[6] >=0;
a[6] <=5;
a[5]==11 -> a[6]==1;
a[5]==12 -> a[6]==3;
solve a[6] before a[5] ;
foreach (a[i])
if(i>=7)
a[i] inside{i, i**2,i**3};
//foreach (a[i])
// if(i>=7)
// a[i] inside{i, i**2,i**3};
//for (int i = 0; i < count; i++) begin
// a[i]=i
//end
}
constraint c2 {
a[7] > a[8];
}
constraint c3 {
a[7] < a[8];
}
// initialization
function new();
endfunction : new
function void statistic(int arr[]);
int arr_u[int];
foreach(arr[i])
if(arr_u[arr[i]]==null)
arr_u[arr[i]]=1;
else
arr_u[arr[i]]++;
foreach(arr_u[i])
$display("the final statistic %0d, count:%0d", i,arr_u[i]);
endfunction: statistic
endclass : ClassCons
class ClassExt extends ClassCons;
// data or class properties
// initialization
function new();
endfunction : new
endclass : ClassExt
module tcc ();
initial begin
`define STAT_SIZE 10000
//ClassCons is an abstract class
ClassExt cc1=new;
ClassExt cc2=new;
int stats[`STAT_SIZE][$];
int stats_tmp[`STAT_SIZE];
cc1.srandom(12);
cc1.rand_mode(1);
cc1.c3.constraint_mode(0);
for (int i = 0; i < `STAT_SIZE; i++) begin
cc1.randomize();
foreach(cc1.a[j]) begin
stats[i].push_back(cc1.a[j]);
end
end
for (int j = 0; j < 10; j++) begin
$display("ans------------%d",j);
foreach(stats[i])
stats_tmp[i] = stats[i][j];
cc1.statistic(stats_tmp);
end
//cc2.rand_mode(0);
foreach(stats[i])
stats[i].delete;
cc2.c1.constraint_mode(1);
cc2.c2.constraint_mode(0);
cc2.c3.constraint_mode(0);
$display("constraint mode cc2 c1 is %d", cc2.c1.constraint_mode);
$display("constraint mode cc2 c2 is %d", cc2.c2.constraint_mode);
for (int i = 0; i < `STAT_SIZE; i++) begin
cc2.randomize();
foreach(cc2.a[j]) begin
stats[i].push_back(cc2.a[j]);
end
end
for (int j = 0; j < 10; j++) begin
$display("ans------------%d",j);
foreach(stats[i])
stats_tmp[i] = stats[i][j];
cc2.statistic(stats_tmp);
end
end
initial begin
ClassExt ce1=new;
$display("value a:%d",ce1.a[0][0]);
//$display("value b:%d",ce1.b);
end
endmodule
输出
过程中需要清空队列
foreach(stats[i])
stats[i].delete;
ans------------ 0 the final statistic 0, count:93 the final statistic 1, count:1009 the final statistic 2, count:1017 the final statistic 3, count:972 the final statistic 4, count:1006 the final statistic 5, count:1013 the final statistic 6, count:959 the final statistic 7, count:965 the final statistic 8, count:967 the final statistic 9, count:1028 the final statistic 10, count:971 ans------------ 1 the final statistic 0, count:912 the final statistic 1, count:851 the final statistic 2, count:881 the final statistic 3, count:946 the final statistic 4, count:903 the final statistic 5, count:900 the final statistic 6, count:918 the final statistic 7, count:946 the final statistic 8, count:904 the final statistic 9, count:898 the final statistic 10, count:941 ans------------ 2 the final statistic 1, count:4953 the final statistic 2, count:5047 ans------------ 3 the final statistic 11, count:3357 the final statistic 12, count:3319 the final statistic 13, count:3324 ans------------ 4 the final statistic 0, count:590 the final statistic 1, count:3889 the final statistic 2, count:532 the final statistic 3, count:3850 the final statistic 4, count:559 the final statistic 5, count:580 ans------------ 5 the final statistic 11, count:838 the final statistic 12, count:833 the final statistic 13, count:8329 ans------------ 6 the final statistic 0, count:1725 the final statistic 1, count:1663 the final statistic 2, count:1653 the final statistic 3, count:1619 the final statistic 4, count:1638 the final statistic 5, count:1702 ans------------ 7 the final statistic 49, count:4975 the final statistic 343, count:5025 ans------------ 8 the final statistic 8, count:7499 the final statistic 64, count:2501 ans------------ 9 the final statistic 9, count:3363 the final statistic 81, count:3314 the final statistic 729, count:3323 constraint mode cc2 c1 is 1 constraint mode cc2 c2 is 0 ans------------ 0 the final statistic 0, count:98 the final statistic 1, count:1003 the final statistic 2, count:993 the final statistic 3, count:990 the final statistic 4, count:996 the final statistic 5, count:988 the final statistic 6, count:929 the final statistic 7, count:968 the final statistic 8, count:999 the final statistic 9, count:984 the final statistic 10, count:1052 ans------------ 1 the final statistic 0, count:875 the final statistic 1, count:965 the final statistic 2, count:916 the final statistic 3, count:909 the final statistic 4, count:872 the final statistic 5, count:903 the final statistic 6, count:903 the final statistic 7, count:911 the final statistic 8, count:926 the final statistic 9, count:878 the final statistic 10, count:942 ans------------ 2 the final statistic 1, count:4915 the final statistic 2, count:5085 ans------------ 3 the final statistic 11, count:3298 the final statistic 12, count:3325 the final statistic 13, count:3377 ans------------ 4 the final statistic 0, count:570 the final statistic 1, count:3850 the final statistic 2, count:563 the final statistic 3, count:3882 the final statistic 4, count:564 the final statistic 5, count:571 ans------------ 5 the final statistic 11, count:834 the final statistic 12, count:864 the final statistic 13, count:8302 ans------------ 6 the final statistic 0, count:1667 the final statistic 1, count:1677 the final statistic 2, count:1677 the final statistic 3, count:1690 the final statistic 4, count:1580 the final statistic 5, count:1709 ans------------ 7 the final statistic 7, count:3374 the final statistic 49, count:3321 the final statistic 343, count:3305 ans------------ 8 the final statistic 8, count:3349 the final statistic 64, count:3342 the final statistic 512, count:3309 ans------------ 9 the final statistic 9, count:3329 the final statistic 81, count:3330 the final statistic 729, count:3341 value a:0
参数化类#， 约束的function，soft，with
class Transaction;
rand bit [31:0] addr,data;
constraint c1 {soft addr inside {[0:100],[1000:2000]};}
endclass
module tdd ();
class ClsA #(int length);
// data or class properties
rand bit[2:0] a[3];
int arr=length;
constraint c1 { a[0] inside{1,2,3}; }
constraint c2 { a[0]==1; }
int c[4];
constraint c3 {c[3]<11; c[2]< consta(); }
// initialization
function new();
endfunction : new
function int consta();
return 10;
endfunction: consta
endclass : ClsA
initial begin
ClsA #(10) ca=new;
ca.c2.constraint_mode(0);
for (int i = 0; i < 20; i++) begin
ca.randomize();
$display("value is %d", ca.a[0]);
end
$display("arr value is %d", ca.arr);
ca.randomize with {ca.a[0]<5;};
end
Transaction t;
initial begin
t= new();
assert(t.randomize() with {addr inside {[200:300]};
data inside {[10:20]}; });
end
endmodule
输出
value is 1 value is 1 value is 1 value is 3 value is 1 value is 2 value is 2 value is 1 value is 1 value is 3 value is 2 value is 1 value is 2 value is 1 value is 1 value is 3 value is 1 value is 2 value is 3 value is 2 arr value is 10
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Le vent se lève! . . . il faut tenter de vivre!
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