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link.MachO.UnwindInfo: Handle u24 overflow for CU records pointing to DWARF.

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Closes #23010.
This commit is contained in:
Alex Rønne Petersen 2025-02-25 08:10:12 +01:00 committed by Andrew Kelley
parent ad5515bed8
commit 743623bc54
1 changed files with 7 additions and 1 deletions
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8
src/link/MachO/UnwindInfo.zig
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@ -68,7 +68,13 @@ pub fn generate(info: *UnwindInfo, macho_file: *MachO) !void {
for (info.records.items) |ref| {
const rec = ref.getUnwindRecord(macho_file);
if (rec.getFde(macho_file)) |fde| {
rec.enc.setDwarfSectionOffset(@intCast(fde.out_offset));
// The unwinder will start looking for a matching CFI at the offset we specify here; it
// isn't actually an offset to the exact CFI for this record. A consequence of this is
// that if the offset doesn't fit in 24 bits, we can just leave it as zero so the
// unwinder starts searching at the beginning of the section.
if (std.math.cast(u24, fde.out_offset)) |off| {
rec.enc.setDwarfSectionOffset(off);
}
if (fde.getLsdaAtom(macho_file)) |lsda| {
rec.lsda = lsda.atom_index;
rec.lsda_offset = fde.lsda_offset;