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add behavior test for comptime pointer casting

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closes #1150
closes #1292
closes #4093
This commit is contained in:
Andrew Kelley 2022-12-18 13:57:17 -07:00
parent aca9c74e80
commit 09ee887e9f
1 changed files with 31 additions and 0 deletions
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31
test/behavior/ptrcast.zig
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@ -203,6 +203,37 @@ test "comptime ptrcast keeps larger alignment" {
}
}
test "ptrcast of const integer has the correct object size" {
const is_value = ~@intCast(isize, std.math.minInt(isize));
const is_bytes = @ptrCast([*]const u8, &is_value)[0..@sizeOf(isize)];
if (@sizeOf(isize) == 8) {
switch (native_endian) {
.Little => {
try expect(is_bytes[0] == 0xff);
try expect(is_bytes[1] == 0xff);
try expect(is_bytes[2] == 0xff);
try expect(is_bytes[3] == 0xff);
try expect(is_bytes[4] == 0xff);
try expect(is_bytes[5] == 0xff);
try expect(is_bytes[6] == 0xff);
try expect(is_bytes[7] == 0x7f);
},
.Big => {
try expect(is_bytes[0] == 0x7f);
try expect(is_bytes[1] == 0xff);
try expect(is_bytes[2] == 0xff);
try expect(is_bytes[3] == 0xff);
try expect(is_bytes[4] == 0xff);
try expect(is_bytes[5] == 0xff);
try expect(is_bytes[6] == 0xff);
try expect(is_bytes[7] == 0xff);
},
}
}
}
test "implicit optional pointer to optional anyopaque pointer" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO