方法は簡単。以下のようにするだけ。
file:test.c
#include <stdio.h>
void hoge(int i){
if(0 == i){
printf("i = 0\n");
}else{
printf("i != 0\n");
}
}
int main(void){
hoge(0);
return(0);
}
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上記test.cをコンパイルして実行ファイルを生成する。
$gcc -Wall -pedantic -fprofile-arcs -ftest-coverage test.c -o test.exe
生成した実行ファイルを実行することによりデータファイルが自動的に作られる。
$./test.exe
データファイルからカバレッジ情報(-bオプションで分岐情報も出力)を生成する。
$ gcov -b test.c
File `test.c'
Lines executed:85.71% of 7
Branches executed:100.00% of 2
Taken at least once:50.00% of 2
Calls executed:75.00% of 4
test.c:creating `test.c.gcov'
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <stdio.h>
-: 2:
function hoge called 1 returned 100% blocks executed 80%
1: 3:void hoge(int i){
1: 4: if(0 == i){
branch 0 taken 100% (fallthrough)
branch 1 taken 0%
1: 5: printf("i = 0\n");
call 0 returned 100%
-: 6: }else{
#####: 7: printf("i != 0\n");
call 0 never executed
-: 8: }
-: 9:}
function main called 1 returned 100% blocks executed 100%
1: 10:int main(void){
call 0 returned 100%
1: 11: hoge(0);
call 0 returned 100%
1: 12: return(0);
-: 13:}
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次に分岐を一つ増やしてみる。
file:test.c
#include <stdio.h>
void hoge(int i){
if(0 == i){
printf("i = 0\n");
}else if(1 == i){
printf("i = 1\n");
}else{
printf("i != 0\n");
}
}
int main(void){
hoge(0);
return(0);
}
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前と同じようにコマンドを実行する。
$gcc -Wall -pedantic -fprofile-arcs -ftest-coverage test.c -o test.exe
$./test.exe
$ gcov -b test.c
File `test.c'
Lines executed:66.67% of 9
Branches executed:50.00% of 4
Taken at least once:25.00% of 4
Calls executed:60.00% of 5
test.c:creating `test.c.gcov'
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <stdio.h>
-: 2:
function hoge called 1 returned 100% blocks executed 50%
1: 3:void hoge(int i){
1: 4: if(0 == i){
branch 0 taken 100% (fallthrough)
branch 1 taken 0%
1: 5: printf("i = 0\n");
call 0 returned 100%
#####: 6: }else if(1 == i){
branch 0 never executed
branch 1 never executed
#####: 7: printf("i = 1\n");
call 0 never executed
-: 8: }else{
#####: 9: printf("i != 0\n");
call 0 never executed
-: 10: }
-: 11:}
function main called 1 returned 100% blocks executed 100%
1: 12:int main(void){
call 0 returned 100%
1: 13: hoge(0);
call 0 returned 100%
1: 14: return(0);
-: 15:}
左側の数字が実行ファイルを実行した時の通過回数。#####は通過していない行。
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