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Sema: check for zero length slices in @alignCast safety

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This commit is contained in:
Veikka Tuominen 2022-07-21 15:57:04 +03:00
parent d75fa86d70
commit 0ef4cc738b
1 changed files with 6 additions and 1 deletions
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7
src/Sema.zig
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@ -16352,7 +16352,12 @@ fn zirAlignCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!A
const ptr_int = try block.addUnOp(.ptrtoint, actual_ptr);
const remainder = try block.addBinOp(.bit_and, ptr_int, align_minus_1);
const is_aligned = try block.addBinOp(.cmp_eq, remainder, .zero_usize);
try sema.addSafetyCheck(block, is_aligned, .incorrect_alignment);
const ok = if (ptr_ty.isSlice()) ok: {
const len = try sema.analyzeSliceLen(block, ptr_src, ptr);
const len_zero = try block.addBinOp(.cmp_eq, len, try sema.addConstant(Type.usize, Value.zero));
break :ok try block.addBinOp(.bit_or, len_zero, is_aligned);
} else is_aligned;
try sema.addSafetyCheck(block, ok, .incorrect_alignment);
}
return sema.coerceCompatiblePtrs(block, dest_ty, ptr, ptr_src);
}