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add behavior test for comptime pointer casting

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comptime `@ptrCast` a subset of an array, then write through it

closes #2444
This commit is contained in:
Andrew Kelley 2022-12-27 14:44:04 -07:00
parent f4b067743f
commit 6e9fbc83ca
3 changed files with 15 additions and 0 deletions
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1
test/behavior/array.zig
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@ -61,6 +61,7 @@ test "array concat with undefined" {
}
test "array concat with tuple" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO

1
test/behavior/bugs/12571.zig
View File

@ -14,6 +14,7 @@ const Entry = packed struct {
test {
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
const frame = Frame{ .num = 0x7FDE };
var entry = Entry{ .other = 0, .frame = .{ .num = 0xFFFFF } };

13
test/behavior/ptrcast.zig
View File

@ -257,3 +257,16 @@ test "@ptrCast slice to slice" {
try expect(buf[1] == 42);
try expect(alias.len == 4);
}
test "comptime @ptrCast a subset of an array, then write through it" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
comptime {
var buff: [16]u8 align(4) = undefined;
const len_bytes = @ptrCast(*u32, &buff);
len_bytes.* = 16;
std.mem.copy(u8, buff[4..], "abcdef");
}
}