https://bugs.llvm.org/show_bug.cgi?id=45425
Bug ID: 45425
Summary: Wrong line table information at -Og
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: unassignedb...@nondot.org
Reporter: ditali...@apple.com
CC: apra...@apple.com, dblai...@gmail.com,
echri...@gmail.com, jdevliegh...@apple.com,
jeremy.morse.l...@gmail.com, keith.wal...@arm.com,
llvm-bugs@lists.llvm.org,
paul_robin...@playstation.sony.com, v...@apple.com
$ cat a.c
int a;
int b(char c) {
return (a >= 2 || c >> a)
? c
: 0;
}
int
main()
{
return b(0);
}
$ ./clang --version
clang version 11.0.0 (https://github.com/llvm/llvm-project
b7397e81fe4dee8ffd4a1353bf0cf3a7d2ed267b)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Users/dcci/work/llvm-mono/build-release/bin/.
$ ./lldb --version
lldb version 11.0.0
clang revision b7397e81fe4dee8ffd4a1353bf0cf3a7d2ed267b
llvm revision b7397e81fe4dee8ffd4a1353bf0cf3a7d2ed267b
To reproduce, set a breakpoint in main, and keep stepping through `s`.
Eventually, you'll hit line `4`, despite the conditions are both false, i.e.
* thread #1, queue = 'com.apple.main-thread', stop reason = step in
frame #0: 0x0000000100000f7a a`b(c='\0') at a.c:4:16 [opt]
1 int a;
2 int b(char c) {
3 return (a >= 2 || c >> a)
-> 4 ? c
5 : 0;
6 }
7 int
(lldb) p (a >= 2)
(bool) $0 = false
(lldb) p (bool)(c >> a)
(bool) $1 = false
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