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stage2: make (typeHas)OnePossibleValue return the right value

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This commit is contained in:
Robin Voetter 2021-10-20 00:30:20 +02:00
parent 7b97f6792f
commit d6f048c456
2 changed files with 28 additions and 7 deletions
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13
src/Sema.zig
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@ -13835,7 +13835,14 @@ fn typeHasOnePossibleValue(
return null;
}
},
.enum_nonexhaustive => ty = ty.castTag(.enum_nonexhaustive).?.data.tag_ty,
.enum_nonexhaustive => {
const tag_ty = ty.castTag(.enum_nonexhaustive).?.data.tag_ty;
if (tag_ty.cast(Type.Payload.Bits).?.data == 0) {
return Value.initTag(.zero);
} else {
return null;
}
},
.@"union" => {
return null; // TODO
},
@ -13859,8 +13866,8 @@ fn typeHasOnePossibleValue(
.vector, .array, .array_u8 => {
if (ty.arrayLen() == 0)
return Value.initTag(.empty_array);
ty = ty.elemType();
continue;
_ = (try sema.typeHasOnePossibleValue(block, src, ty.elemType())) orelse return null;
return Value.initTag(.the_only_possible_value);
},
.inferred_alloc_const => unreachable,

22
src/type.zig
View File

@ -3096,6 +3096,14 @@ pub const Type = extern union {
}
return Value.initTag(.empty_struct_value);
},
.enum_numbered => {
const enum_numbered = ty.castTag(.enum_numbered).?.data;
if (enum_numbered.fields.count() == 1) {
return enum_numbered.values.keys()[0];
} else {
return null;
}
},
.enum_full => {
const enum_full = ty.castTag(.enum_full).?.data;
if (enum_full.fields.count() == 1) {
@ -3112,8 +3120,14 @@ pub const Type = extern union {
return null;
}
},
.enum_nonexhaustive => ty = ty.castTag(.enum_nonexhaustive).?.data.tag_ty,
.enum_numbered => ty = ty.castTag(.enum_numbered).?.data.tag_ty,
.enum_nonexhaustive => {
const tag_ty = ty.castTag(.enum_nonexhaustive).?.data.tag_ty;
if (tag_ty.cast(Type.Payload.Bits).?.data == 0) {
return Value.initTag(.zero);
} else {
return null;
}
},
.@"union" => {
return null; // TODO
},
@ -3137,8 +3151,8 @@ pub const Type = extern union {
.vector, .array, .array_u8 => {
if (ty.arrayLen() == 0)
return Value.initTag(.empty_array);
ty = ty.elemType();
continue;
_ = ty.elemType().onePossibleValue() orelse return null;
return Value.initTag(.the_only_possible_value);
},
.inferred_alloc_const => unreachable,