https://bugs.llvm.org/show_bug.cgi?id=46046
Bug ID: 46046
Summary: inconsistent behaviors at -O1
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: RESOLVED
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
Status: RESOLVED
Resolution: DUPLICATE
$ 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 -O1 -g small.c
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/home/yibiao/Debugger/a.out' (x86_64).
(lldb) b 22
Breakpoint 1: where = a.out`foo + 37 at small.c:22:3, address =
0x0000000000401135
(lldb) r
Process 367418 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 367418 exited with status = 0 (0x00000000)
(lldb)
/*********************************************
As showed above, when setting breakpoint at Line 22, lldb wrongly exit
directly.
Line 22 is actually executed in step-i as follow:
*********************************************/
$ 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 + 1 at small.c:26:3, address =
0x0000000000401151
(lldb) r
Process 367312 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 367312 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000401151 a.out`main at small.c:26:3
23 }
24
25 int main() {
-> 26 foo();
27 return 0;
28 }
(lldb) si -c 9
Process 367312 stopped
* thread #1, name = 'a.out', stop reason = instruction step into
frame #0: 0x000000000040113f a.out`foo at small.c:22:3
19 if (pn->p==(void *)ph)
20 ph->f = &nd;
21
-> 22 return 0;
23 }
24
25 int main() {
(lldb)
$ cat small.c
struct sn {
struct sn *n;
struct sn *p;
} nd;
struct sh {
struct sn *f;
} hs[2];
struct sh *h=&hs[0];
int foo() {
nd.p = (void*)h;
h->f = &nd;
struct sn *pn=h->f;
struct sh *ph=h;
if (pn->p==(void *)ph)
ph->f = &nd;
return 0;
}
int main() {
foo();
return 0;
}
--- Comment #1 from Yibiao Yang (杨已彪) <yangyib...@hust.edu.cn> ---
*** This bug has been marked as a duplicate of bug 46045 ***
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