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mach: improve compatibility with self-hosted compiler

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-08-20 11:41:01 -07:00
parent e92572b776
commit 72b081c97a
3 changed files with 47 additions and 19 deletions
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34
src/platform/util.zig
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@ -2,9 +2,7 @@ const std = @import("std");
const glfw = @import("glfw");
const gpu = @import("gpu");
const objc = @cImport({
@cInclude("objc/message.h");
});
const objc = @import("objc_message.zig");
pub inline fn printUnhandledErrorCallback(_: void, typ: gpu.ErrorType, message: [*:0]const u8) void {
switch (typ) {
@ -166,21 +164,33 @@ pub const AutoReleasePool = if (!@import("builtin").target.isDarwin()) opaque {
};
// Borrowed from https://github.com/hazeycode/zig-objcrt
fn msgSend(obj: anytype, sel_name: [:0]const u8, args: anytype, comptime ReturnType: type) ReturnType {
pub fn msgSend(obj: anytype, sel_name: [:0]const u8, args: anytype, comptime ReturnType: type) ReturnType {
const args_meta = @typeInfo(@TypeOf(args)).Struct.fields;
const FnType = switch (args_meta.len) {
0 => fn (@TypeOf(obj), objc.SEL) callconv(.C) ReturnType,
1 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type) callconv(.C) ReturnType,
2 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type) callconv(.C) ReturnType,
3 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type) callconv(.C) ReturnType,
4 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type, args_meta[3].field_type) callconv(.C) ReturnType,
const FnType = if (@import("builtin").zig_backend == .stage1)
switch (args_meta.len) {
0 => fn (@TypeOf(obj), objc.SEL) callconv(.C) ReturnType,
1 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type) callconv(.C) ReturnType,
2 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type) callconv(.C) ReturnType,
3 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type) callconv(.C) ReturnType,
4 => fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type, args_meta[3].field_type) callconv(.C) ReturnType,
else => @compileError("Unsupported number of args"),
}
else switch (args_meta.len) {
0 => *const fn (@TypeOf(obj), objc.SEL) callconv(.C) ReturnType,
1 => *const fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type) callconv(.C) ReturnType,
2 => *const fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type) callconv(.C) ReturnType,
3 => *const fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type) callconv(.C) ReturnType,
4 => *const fn (@TypeOf(obj), objc.SEL, args_meta[0].field_type, args_meta[1].field_type, args_meta[2].field_type, args_meta[3].field_type) callconv(.C) ReturnType,
else => @compileError("Unsupported number of args"),
};
// NOTE: func is a var because making it const causes a compile error which I believe is a compiler bug
var func = @ptrCast(FnType, objc.objc_msgSend);
const sel = objc.sel_getUid(sel_name);
var func = if (@import("builtin").zig_backend == .stage1)
@ptrCast(FnType, objc.objc_msgSend)
else
@ptrCast(FnType, &objc.objc_msgSend);
const sel = objc.sel_getUid(@ptrCast([*c]const u8, sel_name));
return @call(.{}, func, .{ obj, sel } ++ args);
}