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stage2 codegen: genTypedValue for error unions and error sets

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joachimschmidt557 2021-07-30 11:43:17 +02:00 committed by Andrew Kelley
parent e5e6ceda6a
commit f6b1fa9e29
1 changed files with 27 additions and 1 deletions
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28
src/codegen.zig
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@ -19,7 +19,6 @@ const DW = std.dwarf;
const leb128 = std.leb;
const log = std.log.scoped(.codegen);
const build_options = @import("build_options");
const LazySrcLoc = Module.LazySrcLoc;
const RegisterManager = @import("register_manager.zig").RegisterManager;
const X8664Encoder = @import("codegen/x86_64.zig").Encoder;
@ -4741,6 +4740,33 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
}
return self.fail("TODO non pointer optionals", .{});
},
.ErrorSet => {
switch (typed_value.val.tag()) {
.@"error" => {
const err_name = typed_value.val.castTag(.@"error").?.data.name;
const module = self.bin_file.options.module.?;
const global_error_set = module.global_error_set;
const error_index = global_error_set.get(err_name).?;
return MCValue{ .immediate = error_index };
},
else => {
// In this case we are rendering an error union which has a 0 bits payload.
return MCValue{ .immediate = 0 };
},
}
},
.ErrorUnion => {
const error_type = typed_value.ty.errorUnionSet();
const payload_type = typed_value.ty.errorUnionPayload();
const sub_val = typed_value.val.castTag(.error_union).?.data;
if (!payload_type.hasCodeGenBits()) {
// We use the error type directly as the type.
return self.genTypedValue(.{ .ty = error_type, .val = sub_val });
}
return self.fail("TODO implement error union const of type '{}'", .{typed_value.ty});
},
else => return self.fail("TODO implement const of type '{}'", .{typed_value.ty}),
}
}