[lldb-dev] [Bug 45921] New: lldb not directly stopped at a specified statement

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=45921

            Bug ID: 45921
           Summary: lldb not directly stopped at a specified statement
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: yangyibiao at hust.edu.cn
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

$ lldb --version
lldb version 11.0.0
  clang revision 871beba234a83a2a02da9dedbd59b91a1bfbd7af
  llvm revision 871beba234a83a2a02da9dedbd59b91a1bfbd7af

$ 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

$ clang -g small.c
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/home/yibiao/Debugger/a.out' (x86_64).
(lldb) b 5
Breakpoint 1: where = a.out`sig + 13 at small.c:5:3, address =
0x000000000040114d
(lldb) r
Process 15731 launched: '/home/yibiao/Debugger/a.out' (x86_64)
Process 15731 stopped
* thread #1, name = 'a.out', stop reason = signal SIGFPE: integer divide by
zero
    frame #0: 0x0000000000401193 a.out`main at small.c:10:9
   7    
   8    int main () {
   9      signal(8, sig);
-> 10     k = i / j;
   11     return 0;
   12   }
(lldb) s
Process 15731 stopped
* thread #1, name = 'a.out', stop reason = step in
    frame #0: 0x0000000000401141 a.out`sig(s=0) at small.c:4
   1    #include <signal.h>
   2    
   3    static int i, j, k;
-> 4    void sig (int s) {
   5      exit(0);
   6    }
   7    
(lldb) s
Process 15731 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
    frame #0: 0x000000000040114d a.out`sig(s=8) at small.c:5:3
   2    
   3    static int i, j, k;
   4    void sig (int s) {
-> 5      exit(0);
   6    }
   7    
   8    int main () {
(lldb) 


/************************
As shows, LLDB not directly stopped at the specified statement Line 5. When
continue stepping, it will stopped at Line 5 again. 
*************************/


$ cat small.c
#include <signal.h>

static int i, j, k;
void sig (int s) {
  exit(0);
}

int main () {
  signal(8, sig);
  k = i / j;
  return 0;
}

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