https://bugs.llvm.org/show_bug.cgi?id=51778
Bug ID: 51778
Summary: Missing variables after InlinerPass at O2
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 "InlinerPass on SCC (main)".
$ cat a.c
void a()
{
short l_55 = 0;
int l_59 = 3, l_60 = 1, l_63 = 0, l_64 = 0, l_93 = 1, i = 0;
char l_113 = 3;
for (; i < 1; i++)
{
test_nop();
test_support_2993(l_55, l_59, l_60, l_63, l_64, l_93, l_113, 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_2993(int l_55, int l_59, int l_60, int l_63, int l_64, int
l_93, int l_113, int i) {
printf("%d %d %d %d %d %d %d %d", l_55, l_59, l_60, l_63, l_64, l_93,
l_113, i);
}
$ cat lib/test.h
#pragma once
void test_nop();
void test_support_2993(int l_55, int l_59, int l_60, int l_63, int l_64, int
l_93, int l_113, 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 -O2 -o opt lib/test.c a.c
$ lldb opt
(lldb) target create "opt"
Current executable set to '/home/cristianrichie/62/reduce/opt' (x86_64).
(lldb) b 8
Breakpoint 1: 2 locations.
(lldb) r
Process 1774 launched: '/home/cristianrichie/62/reduce/opt' (x86_64)
Process 1774 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.2
frame #0: 0x0000000000401171 opt`main [inlined] a at a.c:8:1
5 char l_113 = 3;
6 for (; i < 1; i++)
7 {
-> 8 test_nop();
9 test_support_2993(l_55, l_59, l_60, l_63, l_64, l_93, l_113, i);
10 }
11 }
(lldb) frame var
(short) l_55 = 0
(int) l_59 = 3
(int) l_60 = 1
(int) l_63 = 0
(int) l_64 = 0
(int) l_93 = 1
(char) l_113 = '\x03'
(lldb) frame var i
error: no variable named 'i' found in this frame
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