https://bugs.llvm.org/show_bug.cgi?id=35493
Bug ID: 35493
Summary: [LLVM-COV] statements after two labels and '||'
operator are wrongly marked as not executed in
llvm-cov
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: yangyib...@nju.edu.cn
CC: llvm-bugs@lists.llvm.org
$ clang -v
clang version 6.0.0-svn319460-1~exp1 (trunk)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.1
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.2.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ cat small.c
void main()
{
int g = 1;
if (1){
if (1)
goto lbl2;
lbl1:
g++;
lbl2:
g = 1 || 0;
g = 0;
}
return;
}
$ clang -w -O0 -g -fcoverage-mapping -fprofile-instr-generate=small.profraw
small.c -I/usr/include/csmith; ./a.out; llvm-profdata merge small.profraw -o
small.profdata; llvm-cov show a.out -instr-profile=small.profdata small.c >
small.gcov
$ cat small.gcov
1| |void main()
2| 1|{
3| 1| int g = 1;
4| 1| if (1){
5| 1| if (1)
6| 1| goto lbl2;
7| 0|lbl1:
8| 0| g++;
9| 1|lbl2:
10| 1| g = 1 || 0;
11| 0| g = 0;
12| 0| }
13| 1| return;
14| 1|}
As we can find that Line #11 and #12 were wrongly marked as not executed.
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