Hello!
On Wed, May 04, 2011 at 02:29:32PM +0800, haihao shen wrote:
> I found CIL treats the following two functions differently.
> void loop_test1()
> while((get_a()<1) && (get_b()<1))
> void loop_test2()
> while(!(get_a()<1) && !(get_b()<1))
Your conditions that control the `while'-loops in loop_test1()
and loop_test2() are different and they have different CFG
representations.
> Does CIL consider the complete of partial logic expression, e.g., !(get_a()<1)
> VS. (get_a()<1) ?
C-standard: `&&' and function calls are sequence points.
Logical operations are per definitionem side-effect free.
Maybe, I have missed your point, but I do not see a mistake in my
CIL's output of your test file with `--domakeCFG'. (Parts shown here
after manual reformatting and renaming of the temporary variables.)
void
loop_test1(void)
{
int tmp_a;
int tmp_b;
while (1)
{
tmp_a = get_a();
if (tmp_a < 1)
{
tmp_b = get_b();
if (!(tmp_b < 1))
{
goto while_break;
}
}
else
{
goto while_break;
}
a++;
b++;
}
while_break: /* CIL Label */ ;
}
void
loop_test2(void)
{
int tmp_a;
int tmp_b;
while (1)
{
tmp_a = get_a();
if (tmp_a < 1)
{
goto while_break;
}
else
{
tmp_b = get_b();
if (tmp_b < 1)
{
goto while_break;
}
}
a--;
b--;
}
while_break: /* CIL Label */ ;
}
/Chris
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