From 6e9fbc83ca2cfe145d73a102e4175e49524d0dee Mon Sep 17 00:00:00 2001 From: Andrew Kelley Date: Tue, 27 Dec 2022 14:44:04 -0700 Subject: [PATCH] add behavior test for comptime pointer casting comptime `@ptrCast` a subset of an array, then write through it closes #2444 --- test/behavior/array.zig | 1 + test/behavior/bugs/12571.zig | 1 + test/behavior/ptrcast.zig | 13 +++++++++++++ 3 files changed, 15 insertions(+) diff --git a/test/behavior/array.zig b/test/behavior/array.zig index 2f426bf5bf..52a4d7512a 100644 --- a/test/behavior/array.zig +++ b/test/behavior/array.zig @@ -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 diff --git a/test/behavior/bugs/12571.zig b/test/behavior/bugs/12571.zig index 4338051b18..ace1e93b3f 100644 --- a/test/behavior/bugs/12571.zig +++ b/test/behavior/bugs/12571.zig @@ -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 } }; diff --git a/test/behavior/ptrcast.zig b/test/behavior/ptrcast.zig index e2d33f898c..0a983f82c6 100644 --- a/test/behavior/ptrcast.zig +++ b/test/behavior/ptrcast.zig @@ -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"); + } +}