https://bugs.llvm.org/show_bug.cgi?id=46049
Bug ID: 46049
Summary: inconsistent behaviors at -O2
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: yangyib...@hust.edu.cn
CC: jdevliegh...@apple.com, llvm-b...@lists.llvm.org
$ clang --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
$ lldb --version
lldb version 11.0.0
clang revision 871beba234a83a2a02da9dedbd59b91a1bfbd7af
llvm revision 871beba234a83a2a02da9dedbd59b91a1bfbd7af
$ clang -g -O2 small.c
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/home/yibiao/Debugger/a.out' (x86_64).
(lldb) b 6
Breakpoint 1: where = a.out`main + 29 at small.c:6:7, address =
0x000000000040112d
(lldb) r
Process 578366 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 578366 exited with status = 0 (0x00000000)
(lldb)
/********************************
As showed above, Line 6 is not hit by lldb when setting breakpoint.
However, it was hit by lldb when using step-i
*********************************/
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/home/yibiao/Debugger/a.out' (x86_64).
(lldb) b main
Breakpoint 1: where = a.out`main at small.c:4:7, address = 0x0000000000401110
(lldb) r
Process 578410 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 578410 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000401110 a.out`main at small.c:4:7
1 int a, b, d=1;
2
3 int main() {
-> 4 if (d)
5 a = b==0;
6 if (a!=1)
7 return 1;
(lldb) si -c 7
Process 578410 stopped
* thread #1, name = 'a.out', stop reason = instruction step into
frame #0: 0x0000000000401133 a.out`main at small.c:6:8
3 int main() {
4 if (d)
5 a = b==0;
-> 6 if (a!=1)
7 return 1;
8 return 0;
9 }
(lldb)
$ cat small.c
int a, b, d=1;
int main() {
if (d)
a = b==0;
if (a!=1)
return 1;
return 0;
}
--- Comment #1 from Yibiao Yang (杨已彪) <yangyib...@hust.edu.cn> ---
Created attachment 23536
--> https://bugs.llvm.org/attachment.cgi?id=23536&action=edit
the binary
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