<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/97484>97484</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lldb failed to evaluate  address: ouldn't materialize: couldn't get the value of variable g_12: failed to read memory DW_OP_piece(4) from file address 0x4028 error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          edumoot
      </td>
    </tr>
</table>

<pre>
    LLDB failed to compute the address of the static global structure variable, `g_3`, some components of which have been optimized out . We can reproduce this in llvm18.1.2, 17.0.6, and 16.0.3. Details can be seen in the following:
```
clang 4.c -g -O3 -o 4.out 
lldb 4.out
(lldb) br set -l 18
Breakpoint 1: where = 4.out`main [inlined] func_1 at 4.c:18:16, address = 0x0000000000001130
(lldb) r
[…]
* thread #1, name = '4.out', stop reason = breakpoint 1.1
    frame #0: 0x0000555555555130 4.out`main [inlined] func_1 at 4.c:18:16
   15       for (g_5 = 0; (g_5 < 2); g_5++)
   16       { 
   17           int l_20 = 0x95342363;
-> 18                g_3.f2 = (l_20 & 0U);
   19       }
   20       return g_5;
   21   }
(lldb) p g_3
error: Couldn't materialize: couldn't get the value of variable g_3: failed to read memory DW_OP_piece(4) from file address 0x4028
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression
(lldb) 
```

while GDB works well.
```
gdb 4.out
(gdb) b 18
Breakpoint 1 at 0x1130: file 4.c, line 18.
(gdb) r
[…]
Breakpoint 1, func_1 () at 4.c:18
18              g_3.f2 = (l_20 & 0U);
(gdb) p g_3
$1 = {f0 = <optimised out>, f1 = <optimised out>, f2 = 3303, f3 = 0, f4 = <optimised out>}
(gdb) 
```
The source code lists below
`cat 4.c`
```
struct S0 {
   const unsigned long  f0;
   unsigned long  f1;
   int f2: 25;
   unsigned int f3: 1;
   unsigned short  f4;
};

static struct S0 g_3 = {4294967295UL, 0x2EAC4530, 3303, 0, 1U};
static int g_5 = 0x6EC7516A;

static const unsigned short func_1(void)
{ 
    struct S0 *l_2 = &g_3;
    for (g_5 = 0; (g_5 < 2); g_5++)
    { 
        int l_20 = 0x95342363;
        g_3.f2 = (l_20 & 0U);
    }
    return g_5;
}

int main(void)
{
    func_1();
    return 0;
}
```

</pre>
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