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Sema: make sentinel load through array pointer comptime known

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This commit is contained in:
Jacob Young 2023-05-30 23:38:13 -04:00 committed by Andrew Kelley
parent 1430ac2fbb
commit 99531b0d52
1 changed files with 13 additions and 1 deletions
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14
src/Sema.zig
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@ -25520,7 +25520,19 @@ fn elemVal(
return block.addBinOp(.ptr_elem_val, indexable, elem_index);
},
.One => {
assert(indexable_ty.childType(mod).zigTypeTag(mod) == .Array); // Guaranteed by checkIndexable
const array_ty = indexable_ty.childType(mod); // Guaranteed by checkIndexable
assert(array_ty.zigTypeTag(mod) == .Array);
if (array_ty.sentinel(mod)) |sentinel| {
// index must be defined since it can access out of bounds
if (try sema.resolveDefinedValue(block, elem_index_src, elem_index)) |index_val| {
const index = @intCast(usize, index_val.toUnsignedInt(mod));
if (index == array_ty.arrayLen(mod)) {
return sema.addConstant(array_ty.childType(mod), sentinel);
}
}
}
const elem_ptr = try sema.elemPtr(block, indexable_src, indexable, elem_index, elem_index_src, false, oob_safety);
return sema.analyzeLoad(block, indexable_src, elem_ptr, elem_index_src);
},