https://bugs.llvm.org/show_bug.cgi?id=46030
Bug ID: 46030
Summary: inconsistent behaviors at -O1 (-O0 is correct)
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
Created attachment 23516
--> https://bugs.llvm.org/attachment.cgi?id=23516&action=edit
the binary
$ 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 10
Breakpoint 1: where = a.out`f + 126 at small.c:10:12, address =
0x000000000040118e
(lldb) r
Process 310513 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 310513 exited with status = 0 (0x00000000)
(lldb)
/************************************
As showed, when setting breakpoint on Line 10, lldb exit directly.
However, when step-i, Line 10 is hit by lldb 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:16:3, address =
0x00000000004011c1
(lldb) r
Process 310470 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 310470 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000004011c1 a.out`main at small.c:16:3
13 }
14
15 int main() {
-> 16 f(1, "ab");
17 }
18
(lldb) si -c 25
Process 310470 stopped
* thread #1, name = 'a.out', stop reason = instruction step into
frame #0: 0x00000000004011ac a.out`f(p=<unavailable>) at small.c:10:12
7 va_start(ap, p);
8 while (1) {
9 v = va_arg(ap, char *);
-> 10 if (!v) break;
11 }
12 va_end(ap);
13 }
(lldb)
$ cat small.c
#include <stdarg.h>
void f(int p, ...) {
va_list ap;
char *v;
va_start(ap, p);
while (1) {
v = va_arg(ap, char *);
if (!v) break;
}
va_end(ap);
}
int main() {
f(1, "ab");
}
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