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stage2: add astgen errors for untyped union fields and union field values without inferred tag type

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This commit is contained in:
Matthew Borkowski 2021-10-09 18:50:44 -04:00
parent 784be05a1a
commit ea45062d82
2 changed files with 50 additions and 0 deletions
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16
src/AstGen.zig
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@ -4155,6 +4155,8 @@ fn unionDeclInner(
else
try typeExpr(&block_scope, &namespace.base, member.ast.type_expr);
fields_data.appendAssumeCapacity(@enumToInt(field_type));
} else if (arg_inst == .none and !have_auto_enum) {
return astgen.failNode(member_node, "union field missing type", .{});
}
if (have_align) {
const align_inst = try expr(&block_scope, &block_scope.base, .{ .ty = .u32_type }, member.ast.align_expr);
@ -4175,6 +4177,20 @@ fn unionDeclInner(
},
);
}
if (!have_auto_enum) {
return astgen.failNodeNotes(
node,
"explicitly valued tagged union requires inferred enum tag type",
.{},
&[_]u32{
try astgen.errNoteNode(
member.ast.value_expr,
"tag value specified here",
.{},
),
},
);
}
const tag_value = try expr(&block_scope, &block_scope.base, .{ .ty = arg_inst }, member.ast.value_expr);
fields_data.appendAssumeCapacity(@enumToInt(tag_value));
}

34
test/stage2/cbe.zig
View File

@ -570,6 +570,40 @@ pub fn addCases(ctx: *TestContext) !void {
, "");
}
{
var case = ctx.exeFromCompiledC("unions", .{});
case.addError(
\\const U = union {
\\ a: u32,
\\ b
\\};
, &.{
":3:5: error: union field missing type",
});
case.addError(
\\const E = enum { a, b };
\\const U = union(E) {
\\ a: u32 = 1,
\\ b: f32 = 2,
\\};
, &.{
":2:11: error: explicitly valued tagged union requires inferred enum tag type",
":3:14: note: tag value specified here",
});
case.addError(
\\const U = union(enum) {
\\ a: u32 = 1,
\\ b: f32 = 2,
\\};
, &.{
":1:11: error: explicitly valued tagged union missing integer tag type",
":2:14: note: tag value specified here",
});
}
{
var case = ctx.exeFromCompiledC("enums", .{});