C/C++代码覆盖率生成

初始状态下只有一个源代码文件

[email protected]:testCov> ls
test.c
[email protected]:testCov>

第一步：编译、链接、执行可执行文件

gcc -o a -coverage test.c -lgcov && ./a

这时会生成所需的记录文件（*.gcda，*.gcno）

[email protected]:testCov> ls
a  test.c  test.gcda  test.gcno
[email protected]:testCov>

第二步：分析目标文件

[email protected]:testCov> gcov test.c
File ‘test.c‘
Lines executed:100.00% of 33
Creating ‘test.c.gcov‘

[email protected]:testCov>

这时会生成*.gcov的文件，该类文件可能会有多个我们只需要打开目标文件对应的gcov文件即可

[email protected]:testCov> vim test.c.gcov

结果如下

        -:    0:Source:test.c
        -:    0:Graph:test.gcno
        -:    0:Data:test.gcda
        -:    0:Runs:1
        -:    0:Programs:1
        -:    1:#include <stdio.h>
        -:    2:
        -:    3:char Visit[51];
        -:    4:int Ans[51];
        -:    5:int N;
        -:    6:int Cnt[11];
        -:    7:
    #####:    8:void ForEmptyCheck()
        -:    9:{
    #####:   10:    puts("Here");
    #####:   11:}
        -:   12:
       24:   13:int Sum()
        -:   14:{
       24:   15:    int i, j, Sum = 0;
      120:   16:    for(i = 0; i < N; ++i) {
       96:   17:        int min = Ans[i];
      336:   18:        for(j = i; j < N; ++j) {
      240:   19:            if(Ans[j] < min) {
       58:   20:                min = Ans[j];
        -:   21:            }
        -:   22:        }
       96:   23:        Sum += min;
        -:   24:    }
       24:   25:    ++Cnt[Sum];
       24:   26:    return Sum;
        -:   27:}
        -:   28:
       64:   29:void DFS(int s, int cnt)
        -:   30:{
        -:   31:    int i;
       64:   32:    char over = 1;
       64:   33:    Visit[s] = 1;
       64:   34:    Ans[cnt] = s + 1;
      320:   35:    for(i = 0; i < N; ++i) {
      256:   36:        if(!Visit[i]) {
       60:   37:            over = 0;
       60:   38:            DFS(i, cnt + 1);
       60:   39:            Visit[i] = 0;
        -:   40:        }
        -:   41:    }
       64:   42:    if(over) {
      120:   43:        for(i = 0; i < N; ++i) {
       96:   44:            printf("%d ", Ans[i]);
        -:   45:        }
       24:   46:        printf("\t%d\n", Sum());
        -:   47:    }
       64:   48:}
        -:   49:
        1:   50:int main()
        -:   51:{
        -:   52:    int i;
        1:   53:    N = 4;
        5:   54:    for(i = 0; i < N; ++i) {
        4:   55:        DFS(i, 0);
        4:   56:        Visit[i] = 0;
        -:   57:    }
        8:   58:    for(i=4; i<=10; ++i)
        -:   59:    {
        7:   60:        printf("%d ", Cnt[i]);
        -:   61:    }
        1:   62:    puts("");
        1:   63:    return 0;
        -:   64:}

其中ForEmptyCheck()前面有标记字符串“#####”的字样，表示该函数未被调用;

Sum()前面有标记数字“24”，表示该函数被调用了24次，刚好对应着4!=24