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| 1 | //! Usage: zig run tools/generate_c_size_and_align_checks.zig -- [target_triple] |
| 2 | //! e.g. zig run tools/generate_c_size_and_align_checks.zig -- x86_64-linux-gnu |
| 3 | //! |
| 4 | //! Prints _Static_asserts for the size and alignment of all the basic built-in C |
| 5 | //! types. The output can be run through a compiler for the specified target to |
| 6 | //! verify that Zig's values are the same as those used by a C compiler for the |
| 7 | //! target. |
| 8 | |
| 9 | const std = @import("std"); |
| 10 | |
| 11 | fn c_name(ty: std.Target.CType) []const u8 { |
| 12 | return switch (ty) { |
| 13 | .char => "char", |
| 14 | .short => "short", |
| 15 | .ushort => "unsigned short", |
| 16 | .int => "int", |
| 17 | .uint => "unsigned int", |
| 18 | .long => "long", |
| 19 | .ulong => "unsigned long", |
| 20 | .longlong => "long long", |
| 21 | .ulonglong => "unsigned long long", |
| 22 | .float => "float", |
| 23 | .double => "double", |
| 24 | .longdouble => "long double", |
| 25 | }; |
| 26 | } |
| 27 | |
| 28 | var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){}; |
| 29 | |
| 30 | pub fn main() !void { |
| 31 | const gpa = general_purpose_allocator.allocator(); |
| 32 | defer std.debug.assert(general_purpose_allocator.deinit() == .ok); |
| 33 | |
| 34 | const args = try std.process.argsAlloc(gpa); |
| 35 | defer std.process.argsFree(gpa, args); |
| 36 | |
| 37 | if (args.len != 2) { |
| 38 | std.debug.print("Usage: {s} [target_triple]\n", .{args[0]}); |
| 39 | std.process.exit(1); |
| 40 | } |
| 41 | |
| 42 | const query = try std.Target.Query.parse(.{ .arch_os_abi = args[1] }); |
| 43 | const target = try std.zig.system.resolveTargetQuery(query); |
| 44 | |
| 45 | const stdout = std.io.getStdOut().writer(); |
| 46 | inline for (@typeInfo(std.Target.CType).Enum.fields) |field| { |
| 47 | const c_type: std.Target.CType = @enumFromInt(field.value); |
| 48 | try stdout.print("_Static_assert(sizeof({s}) == {d}, \"\");\n", .{ |
| 49 | c_name(c_type), |
| 50 | target.c_type_byte_size(c_type), |
| 51 | }); |
| 52 | try stdout.print("_Static_assert(_Alignof({s}) == {d}, \"\");\n\n", .{ |
| 53 | c_name(c_type), |
| 54 | target.c_type_alignment(c_type), |
| 55 | }); |
| 56 | } |
| 57 | } |
Evan Haas <evan@lagerdata.com> 2024-08-05 12:54:56-07:00
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