v,breaking: add ability to read enum, fn, interface and sumtype attri…

…butes in compile-time, change builtin `StructAttribute` to `VAttribute` (vlang#21149)

vlib/builtin/builtin.v

@@ -151,7 +151,7 @@ pub enum AttributeKind {
 	comptime_define // [if name]
 }
 
-pub struct StructAttribute {
+pub struct VAttribute {
 pub:
 	name    string
 	has_arg bool

vlib/db/mysql/mysql_orm_test.v

@@ -51,10 +51,10 @@ fn test_mysql_orm() {
 			name: 'id'
 			typ: typeof[int]().idx
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					kind: .plain

vlib/db/pg/pg_orm_test.v

@@ -55,13 +55,13 @@ fn test_pg_orm() {
 			default_val: ''
 			is_arr: false
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 					has_arg: false
 					arg: ''
 					kind: .plain
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					arg: 'serial'

vlib/db/sqlite/sqlite_orm_test.v

@@ -36,10 +36,10 @@ fn test_sqlite_orm() {
 			name: 'id'
 			typ: typeof[int]().idx
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					kind: .plain

vlib/orm/orm.v

@@ -152,7 +152,7 @@ pub:
 	typ         int
 	nullable    bool
 	default_val string
-	attrs       []StructAttribute
+	attrs       []VAttribute
 	is_arr      bool
 }
 

vlib/orm/orm_fn_test.v

@@ -156,10 +156,10 @@ fn test_orm_table_gen() {
 			default_val: '10'
 			nullable: true
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					arg: 'serial'
@@ -188,10 +188,10 @@ fn test_orm_table_gen() {
 			nullable: true
 			default_val: '10'
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					arg: 'serial'
@@ -220,10 +220,10 @@ fn test_orm_table_gen() {
 			nullable: true
 			default_val: '10'
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					arg: 'serial'
@@ -235,7 +235,7 @@ fn test_orm_table_gen() {
 			name: 'test'
 			typ: typeof[string]().idx
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'unique'
 				},
 			]
@@ -255,10 +255,10 @@ fn test_orm_table_gen() {
 			nullable: true
 			default_val: '10'
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'primary'
 				},
-				StructAttribute{
+				VAttribute{
 					name: 'sql'
 					has_arg: true
 					arg: 'serial'
@@ -271,7 +271,7 @@ fn test_orm_table_gen() {
 			typ: typeof[string]().idx
 			nullable: true
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'unique'
 					has_arg: true
 					arg: 'test'
@@ -285,7 +285,7 @@ fn test_orm_table_gen() {
 			nullable: true
 			default_val: '6754'
 			attrs: [
-				StructAttribute{
+				VAttribute{
 					name: 'unique'
 					has_arg: true
 					arg: 'test'

vlib/v/ast/table.v

@@ -24,6 +24,7 @@ pub mut:
 	redefined_fns      []string
 	fn_generic_types   map[string][][]Type // for generic functions
 	interfaces         map[int]InterfaceDecl
+	sumtypes           map[int]SumTypeDecl
 	cmod_prefix        string // needed for ast.type_to_str(Type) while vfmt; contains `os.`
 	is_fmt             bool
 	used_fns           map[string]bool // filled in by the checker, when pref.skip_unused = true;
@@ -222,6 +223,10 @@ pub fn (mut t Table) register_interface(idecl InterfaceDecl) {
 	t.interfaces[idecl.typ] = idecl
 }
 
+pub fn (mut t Table) register_sumtype(sumtyp SumTypeDecl) {
+	t.sumtypes[sumtyp.typ] = sumtyp
+}
+
 pub fn (mut t TypeSymbol) register_method(new_fn Fn) int {
 	// returns a method index, stored in the ast.FnDecl
 	// for faster lookup in the checker's fn_decl method
@@ -2519,3 +2524,27 @@ pub fn (t &Table) get_trace_fn_name(cur_fn FnDecl, node CallExpr) (string, strin
 	}
 	return hash_fn, fn_name
 }
+
+// get_attrs retrieve the attribrutes from the type symbol
+pub fn (t &Table) get_attrs(sym TypeSymbol) []Attr {
+	match sym.info {
+		Enum {
+			return t.enum_decls[sym.name].attrs
+		}
+		Struct {
+			return sym.info.attrs
+		}
+		FnType {
+			return sym.info.func.attrs
+		}
+		Interface {
+			return unsafe { t.interfaces[sym.idx].attrs }
+		}
+		SumType {
+			return unsafe { t.sumtypes[sym.idx].attrs }
+		}
+		else {
+			return []
+		}
+	}
+}

vlib/v/gen/c/comptime.v

@@ -932,11 +932,11 @@ fn (mut g Gen) comptime_for(node ast.ComptimeFor) {
 			}
 		}
 	} else if node.kind == .attributes {
-		if sym.info is ast.Struct {
-			if sym.info.attrs.len > 0 {
-				g.writeln('\tStructAttribute ${node.val_var} = {0};')
-			}
-			for attr in sym.info.attrs {
+		attrs := g.table.get_attrs(sym)
+		if attrs.len > 0 {
+			g.writeln('\tVAttribute ${node.val_var} = {0};')
+
+			for attr in attrs {
 				g.writeln('/* attribute ${i} */ {')
 				g.writeln('\t${node.val_var}.name = _SLIT("${attr.name}");')
 				g.writeln('\t${node.val_var}.has_arg = ${attr.has_arg};')

vlib/v/gen/c/orm.v

@@ -170,14 +170,14 @@ fn (mut g Gen) write_orm_create_table(node ast.SqlStmtLine, table_name string, c
 			g.writeln('.is_arr = ${sym.kind == .array}, ')
 			g.writeln('.nullable = ${field.typ.has_flag(.option)},')
 			g.writeln('.default_val = (string){ .str = (byteptr) "${field.default_val}", .is_lit = 1 },')
-			g.writeln('.attrs = new_array_from_c_array(${field.attrs.len}, ${field.attrs.len}, sizeof(StructAttribute),')
+			g.writeln('.attrs = new_array_from_c_array(${field.attrs.len}, ${field.attrs.len}, sizeof(VAttribute),')
 			g.indent++
 
 			if field.attrs.len > 0 {
-				g.write('_MOV((StructAttribute[${field.attrs.len}]){')
+				g.write('_MOV((VAttribute[${field.attrs.len}]){')
 				g.indent++
 				for attr in field.attrs {
-					g.write('(StructAttribute){')
+					g.write('(VAttribute){')
 					g.indent++
 					g.write(' .name = _SLIT("${attr.name}"),')
 					g.write(' .has_arg = ${attr.has_arg},')

vlib/v/parser/comptime.v

@@ -360,7 +360,7 @@ fn (mut p Parser) comptime_for() ast.ComptimeFor {
 		'attributes' {
 			p.scope.register(ast.Var{
 				name: val_var
-				typ: p.table.find_type_idx('StructAttribute')
+				typ: p.table.find_type_idx('VAttribute')
 				pos: var_pos
 			})
 			kind = .attributes

vlib/v/parser/parser.v

@@ -4409,7 +4409,7 @@ fn (mut p Parser) type_decl() ast.TypeDecl {
 				name_pos)
 			return ast.SumTypeDecl{}
 		}
-		return ast.SumTypeDecl{
+		node := ast.SumTypeDecl{
 			name: name
 			typ: typ
 			is_pub: is_pub
@@ -4419,6 +4419,8 @@ fn (mut p Parser) type_decl() ast.TypeDecl {
 			pos: decl_pos
 			name_pos: name_pos
 		}
+		p.table.register_sumtype(node)
+		return node
 	}
 	// type MyType = int
 	if generic_types.len > 0 {

vlib/v/tests/comptime_attr_test.v

@@ -0,0 +1,78 @@
+@[bar; foo]
+fn abc() {
+}
+
+@[foo]
+struct Foo {
+}
+
+@[bar]
+fn Foo.bar() {
+}
+
+@[baz]
+enum EnumFoo {
+	a
+	b
+}
+
+@[iface]
+interface IFoo {
+}
+
+@[custom]
+type CustomType = EnumFoo | Foo
+
+fn test_main() {
+	mut c := 0
+	$for f in abc.attributes {
+		dump(f)
+		assert f.name in ['foo', 'bar']
+		c++
+	}
+	assert c == 2
+
+	$for f in Foo.attributes {
+		dump(f)
+		assert f.name == 'foo'
+		c++
+	}
+	assert c == 3
+
+	a := Foo.bar
+	$for f in a.attributes {
+		dump(f)
+		assert f.name == 'bar'
+		c++
+	}
+	assert c == 4
+
+	b := abc
+	$for f in b.attributes {
+		dump(f)
+		assert f.name in ['foo', 'bar']
+		c++
+	}
+	assert c == 6
+
+	$for f in EnumFoo.attributes {
+		dump(f)
+		assert f.name == 'baz'
+		c++
+	}
+	assert c == 7
+
+	$for f in IFoo.attributes {
+		dump(f)
+		assert f.name == 'iface'
+		c++
+	}
+	assert c == 8
+
+	$for f in CustomType.attributes {
+		dump(f)
+		assert f.name == 'custom'
+		c++
+	}
+	assert c == 9
+}

vlib/v/tests/comptime_dump_test.v

@@ -42,7 +42,7 @@ fn test_main() {
 		dump(f)
 		dump(f.name)
 		c += 1
-		assert typeof(f).name == 'StructAttribute'
+		assert typeof(f).name == 'VAttribute'
 	}
 	assert c == 8
 }