Fix integer underflow in Unit.resizeHeader() #25974
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When a DWARF unit has no previous unit (i.e., it's the first unit
in a section), the code incorrectly calculated `available_len = 0`,
even though there was actually `unit.off` bytes of available space
before the unit.
```zig
const available_len = if (unit.prev.unwrap()) |prev_unit| prev_excess: {
const prev_unit_ptr = sec.getUnit(prev_unit);
break :prev_excess unit.off - prev_unit_ptr.off - prev_unit_ptr.len;
} else 0; // ← BUG: Should be unit.off, not 0
```
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How is this change related to an integer underflow? |
It's an AI generated PR but this doesn't show the full reasoning why it's an integer underflow either. |
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When a DWARF unit has no previous unit (i.e., it's the first unit in a section), the code incorrectly calculated
available_len = 0, even though there was actuallyunit.offbytes of available space before the unit.