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* [Bug gcov-profile/97919] New: [GCOV]volatile member in struct lead to incorrect code coverage
@ 2020-11-20 1:52 yangyibiao at outlook dot com
2020-11-20 9:15 ` [Bug gcov-profile/97919] " marxin at gcc dot gnu.org
2020-11-20 9:16 ` marxin at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: yangyibiao at outlook dot com @ 2020-11-20 1:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97919
Bug ID: 97919
Summary: [GCOV]volatile member in struct lead to incorrect code
coverage
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: yangyibiao at outlook dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
$ cat test.c
static unsigned int s_irq[10];
static struct S {
volatile unsigned int slock;
unsigned int irq;
} sp[10];
static __inline__ __attribute__((always_inline)) int f1(int irq)
{
return ((irq == 2) ? 9 : irq);
}
void f(void)
{
struct S *up;
int i;
for (i=0, up=sp; i<10; i++, up++)
up->irq = f1(s_irq[i]);
}
int main(void){ f(); }
$ gcc -O0 --coverage test.c; ./a.out; gcov test.c; cat test.c.gcov
File 'test.c'
Lines executed:100.00% of 6
Creating 'test.c.gcov'
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 1:static unsigned int s_irq[10];
-: 2:
-: 3:static struct S {
-: 4: volatile unsigned int slock;
-: 5: unsigned int irq;
-: 6:} sp[10];
-: 7:
-: 8:static __inline__ __attribute__((always_inline)) int f1(int
irq)
-: 9:{
10*: 10: return ((irq == 2) ? 9 : irq);
-: 11:}
-: 12:
1: 13:void f(void)
-: 14:{
-: 15: struct S *up;
-: 16: int i;
-: 17:
11: 18: for (i=0, up=sp; i<10; i++, up++)
20: 19: up->irq = f1(s_irq[i]);
1: 20:}
-: 21:
1: 22:int main(void){ f(); }
################
We can found that Line 19 is wrongly marked as executed 20 times.
When debug this program in debugger, it only hit 10 time.
$ gcc --version; gcov --version
gcc (GCC) 10.0.1 20200419 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
gcov (GCC) 10.0.1 20200419 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/97919] [GCOV]volatile member in struct lead to incorrect code coverage
2020-11-20 1:52 [Bug gcov-profile/97919] New: [GCOV]volatile member in struct lead to incorrect code coverage yangyibiao at outlook dot com
@ 2020-11-20 9:15 ` marxin at gcc dot gnu.org
2020-11-20 9:16 ` marxin at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: marxin at gcc dot gnu.org @ 2020-11-20 9:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97919
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Invalid because __inline__ __attribute__((always_inline)) leads to an optimized
code. Please do not use it if you want to have precise coverage information.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/97919] [GCOV]volatile member in struct lead to incorrect code coverage
2020-11-20 1:52 [Bug gcov-profile/97919] New: [GCOV]volatile member in struct lead to incorrect code coverage yangyibiao at outlook dot com
2020-11-20 9:15 ` [Bug gcov-profile/97919] " marxin at gcc dot gnu.org
@ 2020-11-20 9:16 ` marxin at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: marxin at gcc dot gnu.org @ 2020-11-20 9:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97919
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 97921 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-11-20 9:16 UTC | newest]
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2020-11-20 1:52 [Bug gcov-profile/97919] New: [GCOV]volatile member in struct lead to incorrect code coverage yangyibiao at outlook dot com
2020-11-20 9:15 ` [Bug gcov-profile/97919] " marxin at gcc dot gnu.org
2020-11-20 9:16 ` marxin at gcc dot gnu.org
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