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Sema: correct sentinel check on implicit cast from array ptr

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Closes #12938
This commit is contained in:
Veikka Tuominen 2022-09-23 15:58:04 +03:00
parent 3de5c3b503
commit 581df942e1
2 changed files with 54 additions and 13 deletions
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42
src/Sema.zig
View file

@ -23014,9 +23014,37 @@ fn coerceExtra(
const dest_is_mut = dest_info.mutable;
const dst_elem_type = dest_info.pointee_type;
switch (try sema.coerceInMemoryAllowed(block, dst_elem_type, array_elem_type, dest_is_mut, target, dest_ty_src, inst_src)) {
const elem_res = try sema.coerceInMemoryAllowed(block, dst_elem_type, array_elem_type, dest_is_mut, target, dest_ty_src, inst_src);
switch (elem_res) {
.ok => {},
else => break :src_array_ptr,
else => {
in_memory_result = .{ .ptr_child = .{
.child = try elem_res.dupe(sema.arena),
.actual = array_elem_type,
.wanted = dst_elem_type,
} };
break :src_array_ptr;
},
}
if (dest_info.sentinel) |dest_sent| {
if (array_ty.sentinel()) |inst_sent| {
if (!dest_sent.eql(inst_sent, dst_elem_type, sema.mod)) {
in_memory_result = .{ .ptr_sentinel = .{
.actual = inst_sent,
.wanted = dest_sent,
.ty = dst_elem_type,
} };
break :src_array_ptr;
}
} else {
in_memory_result = .{ .ptr_sentinel = .{
.actual = Value.initTag(.unreachable_value),
.wanted = dest_sent,
.ty = dst_elem_type,
} };
break :src_array_ptr;
}
}
switch (dest_info.size) {
@ -23030,17 +23058,7 @@ fn coerceExtra(
},
.Many => {
// *[N]T to [*]T
// *[N:s]T to [*:s]T
// *[N:s]T to [*]T
if (dest_info.sentinel) |dst_sentinel| {
if (array_ty.sentinel()) |src_sentinel| {
if (src_sentinel.eql(dst_sentinel, dst_elem_type, sema.mod)) {
return sema.coerceCompatiblePtrs(block, dest_ty, inst, inst_src);
}
}
} else {
return sema.coerceCompatiblePtrs(block, dest_ty, inst, inst_src);
}
},
.One => {},
}

23
test/cases/compile_errors/implicit_array_ptr_cast_sentinel_mismatch.zig Normal file
View file

@ -0,0 +1,23 @@
fn foo() [:0xff]const u8 {
return "bark";
}
fn bar() [:0]const u16 {
return "bark";
}
pub export fn entry() void {
_ = foo();
}
pub export fn entry1() void {
_ = bar();
}
// error
// backend=stage2
// target=native
//
// :2:12: error: expected type '[:255]const u8', found '*const [4:0]u8'
// :2:12: note: pointer sentinel '0' cannot cast into pointer sentinel '255'
// :1:10: note: function return type declared here
// :5:12: error: expected type '[:0]const u16', found '*const [4:0]u8'
// :5:12: note: pointer type child 'u8' cannot cast into pointer type child 'u16'
// :4:10: note: function return type declared here