https://bugs.llvm.org/show_bug.cgi?id=39868
Bug ID: 39868
Summary: Wrong value for induction variable after a loop (at
-O1)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: jdevliegh...@apple.com, keith.wal...@arm.com,
llvm-bugs@lists.llvm.org,
paul_robin...@playstation.sony.com
$ cat a.c
int a;
int b() {
int i;
for (i = 0; i < 2; i++)
;
patatino();
return a;
}
int main() { b(); }
$ cat b.c
void patatino() {}
Davides-MacBook-Pro:bin dcci$ ./clang a.c b.c -g -O1
Current executable set to './a.out' (x86_64).
(lldb) br set -p patatino
Breakpoint 1: where = a.out`b + 4 at a.c:6:3, address = 0x0000000100000f84
(lldb) r
Process 24530 launched: '/Users/dcci/work/llvm/build-debug/bin/a.out' (x86_64)
a.out was compiled with optimization - stepping may behave oddly; variables may
not be available.
Process 24530 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000100000f84 a.out`b at a.c:6:3 [opt]
3 int i;
4 for (i = 0; i < 2; i++)
5 ;
-> 6 patatino();
7 return a;
8 }
9 int main() { b(); }
(lldb) frame var i
(int) i = 0
This should be either “unavailable”, or “i = 2”. i = 0 is a lie.
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