https://bugs.llvm.org/show_bug.cgi?id=48278
Bug ID: 48278
Summary: llvm-cov: marco in if statement leads to wrong code
coverage
Product: Runtime Libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: libprofile library
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
$ cat test.c
#define MK(A) (A << 2)
int foo(int q)
{
if (q != MK(2))
return 0;
else
return 1;
}
void main()
{
int q = MK(2);
int r = foo(q);
printf("%d\n", r);
}
$ clang -O0 -w -fcoverage-mapping -fprofile-instr-generate=test.profraw test.c;
./a.out; llvm-profdata merge test.profraw -o test.profdata; llvm-cov show a.out
-instr-profile=test.profdata test.c > test.c.lcov; cat test.c.lcov
1
1| 2|#define MK(A) (A << 2)
2| |
3| |int foo(int q)
4| 1|{
5| 1| if (q != MK(2))
6| 1| return 0;
7| 1| else
8| 1| return 1;
9| 1|}
10| |
11| |void main()
12| 1|{
13| 1| int q = MK(2);
14| 1| int r = foo(q);
15| 1| printf("%d\n", r);
16| 1|}
#################
Line #6 is wrongly marked as executed. When debug this program, Line#6 is not
hit by LLDB.
$ clang --version; llvm-cov --version
clang version 11.0.0 (/home/yibiao/.cache/yay/llvm-git/llvm-project
871beba234a83a2a02da9dedbd59b91a1bfbd7af)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
LLVM (http://llvm.org/):
LLVM version 11.0.0
Optimized build.
Default target: x86_64-pc-linux-gnu
Host CPU: skylake
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