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Sema: improve behavior of comptime_int backed enums

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This commit is contained in:
Veikka Tuominen 2022-09-02 16:08:20 +03:00
parent a9cdacff95
commit f281f3d10e
4 changed files with 23 additions and 4 deletions
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7
src/Sema.zig
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@ -2565,7 +2565,7 @@ fn zirEnumDecl(
}
}
if (small.nonexhaustive) {
if (small.nonexhaustive and enum_obj.tag_ty.zigTypeTag() != .ComptimeInt) {
if (fields_len > 1 and std.math.log2_int(u64, fields_len) == enum_obj.tag_ty.bitSize(sema.mod.getTarget())) {
return sema.fail(block, src, "non-exhaustive enum specifies every value", .{});
}
@ -20363,12 +20363,13 @@ fn validateRunTimeType(
.Int,
.Float,
.ErrorSet,
.Enum,
.Frame,
.AnyFrame,
.Void,
=> return true,
.Enum => return !(try sema.typeRequiresComptime(block, src, ty)),
.BoundFn,
.ComptimeFloat,
.ComptimeInt,
@ -29049,7 +29050,7 @@ pub fn typeHasOnePossibleValue(
},
.enum_nonexhaustive => {
const tag_ty = ty.castTag(.enum_nonexhaustive).?.data.tag_ty;
if (!(try sema.typeHasRuntimeBits(block, src, tag_ty))) {
if (tag_ty.zigTypeTag() != .ComptimeInt and !(try sema.typeHasRuntimeBits(block, src, tag_ty))) {
return Value.zero;
} else {
return null;

7
test/behavior/enum.zig
View File

@ -1175,3 +1175,10 @@ test "Non-exhaustive enum with nonstandard int size behaves correctly" {
const E = enum(u15) { _ };
try expect(@sizeOf(E) == @sizeOf(u15));
}
test "Non-exhaustive enum backed by comptime_int" {
const E = enum(comptime_int) { a, b, c, _ };
comptime var e: E = .a;
e = @intToEnum(E, 378089457309184723749);
try expect(@enumToInt(e) == 378089457309184723749);
}

2
test/behavior/union.zig
View File

@ -690,7 +690,7 @@ test "union with only 1 field casted to its enum type which has enum value speci
var e = Expr{ .Literal = Literal{ .Bool = true } };
comptime try expect(Tag(ExprTag) == comptime_int);
var t = @as(ExprTag, e);
comptime var t = @as(ExprTag, e);
try expect(t == Expr.Literal);
try expect(@enumToInt(t) == 33);
comptime try expect(@enumToInt(t) == 33);

11
test/cases/compile_errors/enum_backed_by_comptime_int_must_be_comptime.zig Normal file
View File

@ -0,0 +1,11 @@
pub export fn entry() void {
const E = enum(comptime_int) { a, b, c, _ };
var e: E = .a;
_ = e;
}
// error
// backend=stage2
// target=native
//
// :3:12: error: variable of type 'tmp.entry.E' must be const or comptime