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ir: Typecheck the sentinel value in *[N:S1]T to [S2]T casts

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Closes #6054
This commit is contained in:
LemonBoy 2020-09-01 17:29:10 +02:00
parent 26140678a5
commit c51b871c45
2 changed files with 14 additions and 1 deletions
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7
src/ir.cpp
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@ -15341,9 +15341,14 @@ static IrInstGen *ir_analyze_cast(IrAnalyze *ira, IrInst *source_instr,
ZigType *array_type = actual_type->data.pointer.child_type;
bool const_ok = (slice_ptr_type->data.pointer.is_const || array_type->data.array.len == 0
|| !actual_type->data.pointer.is_const);
if (const_ok && types_match_const_cast_only(ira, slice_ptr_type->data.pointer.child_type,
array_type->data.array.child_type, source_node,
!slice_ptr_type->data.pointer.is_const).id == ConstCastResultIdOk)
!slice_ptr_type->data.pointer.is_const).id == ConstCastResultIdOk &&
(slice_ptr_type->data.pointer.sentinel == nullptr ||
(array_type->data.array.sentinel != nullptr &&
const_values_equal(ira->codegen, array_type->data.array.sentinel,
slice_ptr_type->data.pointer.sentinel))))
{
// If the pointers both have ABI align, it works.
// Or if the array length is 0, alignment doesn't matter.

8
test/compile_errors.zig
View File

@ -2,6 +2,14 @@ const tests = @import("tests.zig");
const std = @import("std");
pub fn addCases(cases: *tests.CompileErrorContext) void {
cases.add("slice sentinel mismatch",
\\export fn entry() void {
\\ const y: [:1]const u8 = &[_:2]u8{ 1, 2 };
\\}
, &[_][]const u8{
"tmp.zig:2:37: error: expected type '[:1]const u8', found '*const [2:2]u8'",
});
cases.add("@Type with undefined",
\\comptime {
\\ _ = @Type(.{ .Array = .{ .len = 0, .child = u8, .sentinel = undefined } });