https://bugs.llvm.org/show_bug.cgi?id=51735
Bug ID: 51735
Summary: Missing variables after PostOrderFunctionAttrsPass at
Og
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected],
[email protected]
Upon calling a function from an external module, the variable i passed to it is
not visible from lldb. Using -opt-bisect-limit we discovered that the pass
causing the symbols disappear is "PostOrderFunctionAttrsPass on SCC (main)".
$ cat a.c
void a()
{
char l_57 = 1;
int l_63 = 2, i = 0;
for (; i < 8; i++)
;
test_nop();
test_support_3215(l_57, l_63, i);
}
int main ()
{
a();
}
$ cat lib/test.c
#include <stdio.h>
#include <stdint.h>
#include "test.h"
void test_nop() {
printf("\n");
}
void test_support_3215(int l_57, int l_63, int i) {
printf("%d %d %d", l_57, l_63, i);
}
$ cat lib/test.h
#pragma once
void test_nop();
void test_support_3215(int l_57, int l_63, int i);
$ clang -v
clang version 13.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ lldb -v
lldb version 13.0.0
clang revision c2c977ce50597b0e5186afc342c5784bd0aa6973
lldb revision c2c977ce50597b0e5186afc342c5784bd0aa6973
$ clang -g -Og -o opt lib/test.c a.c
$ lldb opt
(lldb) target create "opt"
Current executable set to '/home/cristianrichie/159/reduce/opt' (x86_64).
(lldb) b 7
Breakpoint 1: 2 locations.
(lldb) r
Process 4504 launched: '/home/cristianrichie/159/reduce/opt' (x86_64)
Process 4504 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.2
frame #0: 0x0000000000401161 opt`main [inlined] a at a.c:7:1
4 int l_63 = 2, i = 0;
5 for (; i < 8; i++)
6 ;
-> 7 test_nop();
8 test_support_3215(l_57, l_63, i);
9 }
10 int main ()
(lldb) frame var
(char) l_57 = '\x01'
(int) l_63 = 2
(lldb) frame var i
error: no variable named 'i' found in this frame
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