vhdl: avoid crash on incorrect use of signatures

For #2116

3 files changed, 292 insertions, 281 deletions

diff --git a/src/vhdl/vhdl-nodes.ads b/src/vhdl/vhdl-nodes.ads
index 440001102..4a9fc797f 100644
--- a/src/vhdl/vhdl-nodes.ads
+++ b/src/vhdl/vhdl-nodes.ads
@@ -905,6 +905,10 @@ package Vhdl.Nodes is
    --   Get/Set_Type_Marks_List (Field2)
    --
    --   Get/Set_Return_Type_Mark (Field8)
+   --
+   --   Get/Set_Named_Entity (Field4)
+   --
+   --   Get/Set_Is_Forward_Ref (Flag1)
 
    -- Iir_Kind_Overload_List (Short)
    --
diff --git a/src/vhdl/vhdl-nodes_meta.adb b/src/vhdl/vhdl-nodes_meta.adb
index 3c6bb2ef5..81b66f3a3 100644
--- a/src/vhdl/vhdl-nodes_meta.adb
+++ b/src/vhdl/vhdl-nodes_meta.adb
@@ -2847,9 +2847,11 @@ package body Vhdl.Nodes_Meta is
       Field_Attribute_Specification,
       Field_Base_Name,
       --  Iir_Kind_Signature
+      Field_Is_Forward_Ref,
       Field_Signature_Prefix,
       Field_Type_Marks_List,
       Field_Return_Type_Mark,
+      Field_Named_Entity,
       --  Iir_Kind_Aggregate_Info
       Field_Aggr_Min_Length,
       Field_Aggr_Others_Flag,
@@ -5333,285 +5335,285 @@ package body Vhdl.Nodes_Meta is
       Iir_Kind_Binding_Indication => 224,
       Iir_Kind_Entity_Class => 226,
       Iir_Kind_Attribute_Value => 234,
-      Iir_Kind_Signature => 237,
-      Iir_Kind_Aggregate_Info => 244,
-      Iir_Kind_Procedure_Call => 248,
-      Iir_Kind_Record_Element_Constraint => 256,
-      Iir_Kind_Array_Element_Resolution => 258,
-      Iir_Kind_Record_Resolution => 259,
-      Iir_Kind_Record_Element_Resolution => 262,
-      Iir_Kind_Break_Element => 266,
-      Iir_Kind_Attribute_Specification => 275,
-      Iir_Kind_Disconnection_Specification => 281,
-      Iir_Kind_Step_Limit_Specification => 287,
-      Iir_Kind_Configuration_Specification => 293,
-      Iir_Kind_Access_Type_Definition => 300,
-      Iir_Kind_Incomplete_Type_Definition => 307,
-      Iir_Kind_Interface_Type_Definition => 313,
-      Iir_Kind_File_Type_Definition => 319,
-      Iir_Kind_Protected_Type_Declaration => 329,
-      Iir_Kind_Record_Type_Definition => 339,
-      Iir_Kind_Array_Type_Definition => 350,
-      Iir_Kind_Array_Subtype_Definition => 367,
-      Iir_Kind_Record_Subtype_Definition => 380,
-      Iir_Kind_Access_Subtype_Definition => 388,
-      Iir_Kind_Physical_Subtype_Definition => 398,
-      Iir_Kind_Floating_Subtype_Definition => 409,
-      Iir_Kind_Integer_Subtype_Definition => 419,
-      Iir_Kind_Enumeration_Subtype_Definition => 429,
-      Iir_Kind_Enumeration_Type_Definition => 440,
-      Iir_Kind_Integer_Type_Definition => 448,
-      Iir_Kind_Floating_Type_Definition => 456,
-      Iir_Kind_Physical_Type_Definition => 467,
-      Iir_Kind_Range_Expression => 475,
-      Iir_Kind_Protected_Type_Body => 483,
-      Iir_Kind_Wildcard_Type_Definition => 487,
-      Iir_Kind_Foreign_Vector_Type_Definition => 488,
-      Iir_Kind_Subtype_Definition => 495,
-      Iir_Kind_Scalar_Nature_Definition => 503,
-      Iir_Kind_Record_Nature_Definition => 516,
-      Iir_Kind_Array_Nature_Definition => 530,
-      Iir_Kind_Array_Subnature_Definition => 545,
-      Iir_Kind_Overload_List => 546,
-      Iir_Kind_Foreign_Module => 551,
-      Iir_Kind_Entity_Declaration => 564,
-      Iir_Kind_Configuration_Declaration => 574,
-      Iir_Kind_Context_Declaration => 580,
-      Iir_Kind_Package_Declaration => 595,
-      Iir_Kind_Package_Instantiation_Declaration => 609,
-      Iir_Kind_Vmode_Declaration => 621,
-      Iir_Kind_Vprop_Declaration => 633,
-      Iir_Kind_Vunit_Declaration => 646,
-      Iir_Kind_Package_Body => 654,
-      Iir_Kind_Architecture_Body => 667,
-      Iir_Kind_Type_Declaration => 674,
-      Iir_Kind_Anonymous_Type_Declaration => 680,
-      Iir_Kind_Subtype_Declaration => 688,
-      Iir_Kind_Nature_Declaration => 694,
-      Iir_Kind_Subnature_Declaration => 701,
-      Iir_Kind_Package_Header => 703,
-      Iir_Kind_Unit_Declaration => 712,
-      Iir_Kind_Library_Declaration => 720,
-      Iir_Kind_Component_Declaration => 730,
-      Iir_Kind_Attribute_Declaration => 737,
-      Iir_Kind_Group_Template_Declaration => 743,
-      Iir_Kind_Group_Declaration => 750,
-      Iir_Kind_Element_Declaration => 758,
-      Iir_Kind_Nature_Element_Declaration => 765,
-      Iir_Kind_Non_Object_Alias_Declaration => 773,
-      Iir_Kind_Psl_Declaration => 781,
-      Iir_Kind_Psl_Endpoint_Declaration => 795,
-      Iir_Kind_Enumeration_Literal => 807,
-      Iir_Kind_Function_Declaration => 833,
-      Iir_Kind_Procedure_Declaration => 856,
-      Iir_Kind_Function_Body => 866,
-      Iir_Kind_Procedure_Body => 877,
-      Iir_Kind_Function_Instantiation_Declaration => 888,
-      Iir_Kind_Procedure_Instantiation_Declaration => 898,
-      Iir_Kind_Terminal_Declaration => 907,
-      Iir_Kind_Object_Alias_Declaration => 919,
-      Iir_Kind_Free_Quantity_Declaration => 931,
-      Iir_Kind_Spectrum_Quantity_Declaration => 944,
-      Iir_Kind_Noise_Quantity_Declaration => 956,
-      Iir_Kind_Across_Quantity_Declaration => 972,
-      Iir_Kind_Through_Quantity_Declaration => 988,
-      Iir_Kind_File_Declaration => 1003,
-      Iir_Kind_Guard_Signal_Declaration => 1017,
-      Iir_Kind_Signal_Declaration => 1034,
-      Iir_Kind_Variable_Declaration => 1047,
-      Iir_Kind_Constant_Declaration => 1061,
-      Iir_Kind_Iterator_Declaration => 1073,
-      Iir_Kind_Interface_Constant_Declaration => 1090,
-      Iir_Kind_Interface_Variable_Declaration => 1106,
-      Iir_Kind_Interface_Signal_Declaration => 1127,
-      Iir_Kind_Interface_File_Declaration => 1143,
-      Iir_Kind_Interface_Quantity_Declaration => 1159,
-      Iir_Kind_Interface_Terminal_Declaration => 1171,
-      Iir_Kind_Interface_Type_Declaration => 1182,
-      Iir_Kind_Interface_Package_Declaration => 1195,
-      Iir_Kind_Interface_Function_Declaration => 1213,
-      Iir_Kind_Interface_Procedure_Declaration => 1227,
-      Iir_Kind_Signal_Attribute_Declaration => 1230,
-      Iir_Kind_Suspend_State_Declaration => 1233,
-      Iir_Kind_Identity_Operator => 1237,
-      Iir_Kind_Negation_Operator => 1241,
-      Iir_Kind_Absolute_Operator => 1245,
-      Iir_Kind_Not_Operator => 1249,
-      Iir_Kind_Implicit_Condition_Operator => 1253,
-      Iir_Kind_Condition_Operator => 1257,
-      Iir_Kind_Reduction_And_Operator => 1261,
-      Iir_Kind_Reduction_Or_Operator => 1265,
-      Iir_Kind_Reduction_Nand_Operator => 1269,
-      Iir_Kind_Reduction_Nor_Operator => 1273,
-      Iir_Kind_Reduction_Xor_Operator => 1277,
-      Iir_Kind_Reduction_Xnor_Operator => 1281,
-      Iir_Kind_And_Operator => 1286,
-      Iir_Kind_Or_Operator => 1291,
-      Iir_Kind_Nand_Operator => 1296,
-      Iir_Kind_Nor_Operator => 1301,
-      Iir_Kind_Xor_Operator => 1306,
-      Iir_Kind_Xnor_Operator => 1311,
-      Iir_Kind_Equality_Operator => 1316,
-      Iir_Kind_Inequality_Operator => 1321,
-      Iir_Kind_Less_Than_Operator => 1326,
-      Iir_Kind_Less_Than_Or_Equal_Operator => 1331,
-      Iir_Kind_Greater_Than_Operator => 1336,
-      Iir_Kind_Greater_Than_Or_Equal_Operator => 1341,
-      Iir_Kind_Match_Equality_Operator => 1346,
-      Iir_Kind_Match_Inequality_Operator => 1351,
-      Iir_Kind_Match_Less_Than_Operator => 1356,
-      Iir_Kind_Match_Less_Than_Or_Equal_Operator => 1361,
-      Iir_Kind_Match_Greater_Than_Operator => 1366,
-      Iir_Kind_Match_Greater_Than_Or_Equal_Operator => 1371,
-      Iir_Kind_Sll_Operator => 1376,
-      Iir_Kind_Sla_Operator => 1381,
-      Iir_Kind_Srl_Operator => 1386,
-      Iir_Kind_Sra_Operator => 1391,
-      Iir_Kind_Rol_Operator => 1396,
-      Iir_Kind_Ror_Operator => 1401,
-      Iir_Kind_Addition_Operator => 1406,
-      Iir_Kind_Substraction_Operator => 1411,
-      Iir_Kind_Concatenation_Operator => 1416,
-      Iir_Kind_Multiplication_Operator => 1421,
-      Iir_Kind_Division_Operator => 1426,
-      Iir_Kind_Modulus_Operator => 1431,
-      Iir_Kind_Remainder_Operator => 1436,
-      Iir_Kind_Exponentiation_Operator => 1441,
-      Iir_Kind_Function_Call => 1449,
-      Iir_Kind_Aggregate => 1456,
-      Iir_Kind_Parenthesis_Expression => 1459,
-      Iir_Kind_Qualified_Expression => 1463,
-      Iir_Kind_Type_Conversion => 1468,
-      Iir_Kind_Allocator_By_Expression => 1473,
-      Iir_Kind_Allocator_By_Subtype => 1479,
-      Iir_Kind_Selected_Element => 1487,
-      Iir_Kind_Dereference => 1492,
-      Iir_Kind_Implicit_Dereference => 1497,
-      Iir_Kind_Slice_Name => 1504,
-      Iir_Kind_Indexed_Name => 1510,
-      Iir_Kind_Psl_Prev => 1516,
-      Iir_Kind_Psl_Stable => 1521,
-      Iir_Kind_Psl_Rose => 1526,
-      Iir_Kind_Psl_Fell => 1531,
-      Iir_Kind_Psl_Onehot => 1534,
-      Iir_Kind_Psl_Onehot0 => 1537,
-      Iir_Kind_Psl_Expression => 1539,
-      Iir_Kind_Sensitized_Process_Statement => 1560,
-      Iir_Kind_Process_Statement => 1580,
-      Iir_Kind_Concurrent_Simple_Signal_Assignment => 1593,
-      Iir_Kind_Concurrent_Conditional_Signal_Assignment => 1606,
-      Iir_Kind_Concurrent_Selected_Signal_Assignment => 1620,
-      Iir_Kind_Concurrent_Assertion_Statement => 1628,
-      Iir_Kind_Concurrent_Procedure_Call_Statement => 1635,
-      Iir_Kind_Concurrent_Break_Statement => 1643,
-      Iir_Kind_Psl_Assert_Directive => 1657,
-      Iir_Kind_Psl_Assume_Directive => 1669,
-      Iir_Kind_Psl_Cover_Directive => 1681,
-      Iir_Kind_Psl_Restrict_Directive => 1692,
-      Iir_Kind_Block_Statement => 1706,
-      Iir_Kind_If_Generate_Statement => 1717,
-      Iir_Kind_Case_Generate_Statement => 1726,
-      Iir_Kind_For_Generate_Statement => 1735,
-      Iir_Kind_Component_Instantiation_Statement => 1746,
-      Iir_Kind_Psl_Default_Clock => 1749,
-      Iir_Kind_Generate_Statement_Body => 1760,
-      Iir_Kind_If_Generate_Else_Clause => 1766,
-      Iir_Kind_Simple_Simultaneous_Statement => 1773,
-      Iir_Kind_Simultaneous_Null_Statement => 1777,
-      Iir_Kind_Simultaneous_Procedural_Statement => 1788,
-      Iir_Kind_Simultaneous_Case_Statement => 1797,
-      Iir_Kind_Simultaneous_If_Statement => 1806,
-      Iir_Kind_Simultaneous_Elsif => 1812,
-      Iir_Kind_Simple_Signal_Assignment_Statement => 1823,
-      Iir_Kind_Conditional_Signal_Assignment_Statement => 1834,
-      Iir_Kind_Selected_Waveform_Assignment_Statement => 1846,
-      Iir_Kind_Signal_Force_Assignment_Statement => 1856,
-      Iir_Kind_Signal_Release_Assignment_Statement => 1865,
-      Iir_Kind_Null_Statement => 1869,
-      Iir_Kind_Assertion_Statement => 1876,
-      Iir_Kind_Report_Statement => 1882,
-      Iir_Kind_Wait_Statement => 1890,
-      Iir_Kind_Variable_Assignment_Statement => 1897,
-      Iir_Kind_Conditional_Variable_Assignment_Statement => 1904,
-      Iir_Kind_Return_Statement => 1910,
-      Iir_Kind_For_Loop_Statement => 1921,
-      Iir_Kind_While_Loop_Statement => 1932,
-      Iir_Kind_Next_Statement => 1939,
-      Iir_Kind_Exit_Statement => 1946,
-      Iir_Kind_Case_Statement => 1955,
-      Iir_Kind_Procedure_Call_Statement => 1961,
-      Iir_Kind_Break_Statement => 1968,
-      Iir_Kind_If_Statement => 1978,
-      Iir_Kind_Suspend_State_Statement => 1982,
-      Iir_Kind_Elsif => 1988,
-      Iir_Kind_Character_Literal => 1995,
-      Iir_Kind_Simple_Name => 2002,
-      Iir_Kind_Selected_Name => 2010,
-      Iir_Kind_Operator_Symbol => 2015,
-      Iir_Kind_Reference_Name => 2020,
-      Iir_Kind_External_Constant_Name => 2029,
-      Iir_Kind_External_Signal_Name => 2038,
-      Iir_Kind_External_Variable_Name => 2048,
-      Iir_Kind_Selected_By_All_Name => 2054,
-      Iir_Kind_Parenthesis_Name => 2059,
-      Iir_Kind_Package_Pathname => 2063,
-      Iir_Kind_Absolute_Pathname => 2064,
-      Iir_Kind_Relative_Pathname => 2065,
-      Iir_Kind_Pathname_Element => 2070,
-      Iir_Kind_Base_Attribute => 2072,
-      Iir_Kind_Subtype_Attribute => 2077,
-      Iir_Kind_Element_Attribute => 2082,
-      Iir_Kind_Across_Attribute => 2087,
-      Iir_Kind_Through_Attribute => 2092,
-      Iir_Kind_Nature_Reference_Attribute => 2096,
-      Iir_Kind_Left_Type_Attribute => 2101,
-      Iir_Kind_Right_Type_Attribute => 2106,
-      Iir_Kind_High_Type_Attribute => 2111,
-      Iir_Kind_Low_Type_Attribute => 2116,
-      Iir_Kind_Ascending_Type_Attribute => 2121,
-      Iir_Kind_Image_Attribute => 2127,
-      Iir_Kind_Value_Attribute => 2133,
-      Iir_Kind_Pos_Attribute => 2139,
-      Iir_Kind_Val_Attribute => 2145,
-      Iir_Kind_Succ_Attribute => 2151,
-      Iir_Kind_Pred_Attribute => 2157,
-      Iir_Kind_Leftof_Attribute => 2163,
-      Iir_Kind_Rightof_Attribute => 2169,
-      Iir_Kind_Signal_Slew_Attribute => 2177,
-      Iir_Kind_Quantity_Slew_Attribute => 2185,
-      Iir_Kind_Ramp_Attribute => 2193,
-      Iir_Kind_Zoh_Attribute => 2201,
-      Iir_Kind_Ltf_Attribute => 2209,
-      Iir_Kind_Ztf_Attribute => 2219,
-      Iir_Kind_Dot_Attribute => 2226,
-      Iir_Kind_Integ_Attribute => 2233,
-      Iir_Kind_Above_Attribute => 2241,
-      Iir_Kind_Quantity_Delayed_Attribute => 2249,
-      Iir_Kind_Delayed_Attribute => 2258,
-      Iir_Kind_Stable_Attribute => 2267,
-      Iir_Kind_Quiet_Attribute => 2276,
-      Iir_Kind_Transaction_Attribute => 2285,
-      Iir_Kind_Event_Attribute => 2289,
-      Iir_Kind_Active_Attribute => 2293,
-      Iir_Kind_Last_Event_Attribute => 2297,
-      Iir_Kind_Last_Active_Attribute => 2301,
-      Iir_Kind_Last_Value_Attribute => 2305,
-      Iir_Kind_Driving_Attribute => 2309,
-      Iir_Kind_Driving_Value_Attribute => 2313,
-      Iir_Kind_Behavior_Attribute => 2313,
-      Iir_Kind_Structure_Attribute => 2313,
-      Iir_Kind_Simple_Name_Attribute => 2320,
-      Iir_Kind_Instance_Name_Attribute => 2325,
-      Iir_Kind_Path_Name_Attribute => 2330,
-      Iir_Kind_Left_Array_Attribute => 2337,
-      Iir_Kind_Right_Array_Attribute => 2344,
-      Iir_Kind_High_Array_Attribute => 2351,
-      Iir_Kind_Low_Array_Attribute => 2358,
-      Iir_Kind_Length_Array_Attribute => 2365,
-      Iir_Kind_Ascending_Array_Attribute => 2372,
-      Iir_Kind_Range_Array_Attribute => 2379,
-      Iir_Kind_Reverse_Range_Array_Attribute => 2386,
-      Iir_Kind_Attribute_Name => 2395
+      Iir_Kind_Signature => 239,
+      Iir_Kind_Aggregate_Info => 246,
+      Iir_Kind_Procedure_Call => 250,
+      Iir_Kind_Record_Element_Constraint => 258,
+      Iir_Kind_Array_Element_Resolution => 260,
+      Iir_Kind_Record_Resolution => 261,
+      Iir_Kind_Record_Element_Resolution => 264,
+      Iir_Kind_Break_Element => 268,
+      Iir_Kind_Attribute_Specification => 277,
+      Iir_Kind_Disconnection_Specification => 283,
+      Iir_Kind_Step_Limit_Specification => 289,
+      Iir_Kind_Configuration_Specification => 295,
+      Iir_Kind_Access_Type_Definition => 302,
+      Iir_Kind_Incomplete_Type_Definition => 309,
+      Iir_Kind_Interface_Type_Definition => 315,
+      Iir_Kind_File_Type_Definition => 321,
+      Iir_Kind_Protected_Type_Declaration => 331,
+      Iir_Kind_Record_Type_Definition => 341,
+      Iir_Kind_Array_Type_Definition => 352,
+      Iir_Kind_Array_Subtype_Definition => 369,
+      Iir_Kind_Record_Subtype_Definition => 382,
+      Iir_Kind_Access_Subtype_Definition => 390,
+      Iir_Kind_Physical_Subtype_Definition => 400,
+      Iir_Kind_Floating_Subtype_Definition => 411,
+      Iir_Kind_Integer_Subtype_Definition => 421,
+      Iir_Kind_Enumeration_Subtype_Definition => 431,
+      Iir_Kind_Enumeration_Type_Definition => 442,
+      Iir_Kind_Integer_Type_Definition => 450,
+      Iir_Kind_Floating_Type_Definition => 458,
+      Iir_Kind_Physical_Type_Definition => 469,
+      Iir_Kind_Range_Expression => 477,
+      Iir_Kind_Protected_Type_Body => 485,
+      Iir_Kind_Wildcard_Type_Definition => 489,
+      Iir_Kind_Foreign_Vector_Type_Definition => 490,
+      Iir_Kind_Subtype_Definition => 497,
+      Iir_Kind_Scalar_Nature_Definition => 505,
+      Iir_Kind_Record_Nature_Definition => 518,
+      Iir_Kind_Array_Nature_Definition => 532,
+      Iir_Kind_Array_Subnature_Definition => 547,
+      Iir_Kind_Overload_List => 548,
+      Iir_Kind_Foreign_Module => 553,
+      Iir_Kind_Entity_Declaration => 566,
+      Iir_Kind_Configuration_Declaration => 576,
+      Iir_Kind_Context_Declaration => 582,
+      Iir_Kind_Package_Declaration => 597,
+      Iir_Kind_Package_Instantiation_Declaration => 611,
+      Iir_Kind_Vmode_Declaration => 623,
+      Iir_Kind_Vprop_Declaration => 635,
+      Iir_Kind_Vunit_Declaration => 648,
+      Iir_Kind_Package_Body => 656,
+      Iir_Kind_Architecture_Body => 669,
+      Iir_Kind_Type_Declaration => 676,
+      Iir_Kind_Anonymous_Type_Declaration => 682,
+      Iir_Kind_Subtype_Declaration => 690,
+      Iir_Kind_Nature_Declaration => 696,
+      Iir_Kind_Subnature_Declaration => 703,
+      Iir_Kind_Package_Header => 705,
+      Iir_Kind_Unit_Declaration => 714,
+      Iir_Kind_Library_Declaration => 722,
+      Iir_Kind_Component_Declaration => 732,
+      Iir_Kind_Attribute_Declaration => 739,
+      Iir_Kind_Group_Template_Declaration => 745,
+      Iir_Kind_Group_Declaration => 752,
+      Iir_Kind_Element_Declaration => 760,
+      Iir_Kind_Nature_Element_Declaration => 767,
+      Iir_Kind_Non_Object_Alias_Declaration => 775,
+      Iir_Kind_Psl_Declaration => 783,
+      Iir_Kind_Psl_Endpoint_Declaration => 797,
+      Iir_Kind_Enumeration_Literal => 809,
+      Iir_Kind_Function_Declaration => 835,
+      Iir_Kind_Procedure_Declaration => 858,
+      Iir_Kind_Function_Body => 868,
+      Iir_Kind_Procedure_Body => 879,
+      Iir_Kind_Function_Instantiation_Declaration => 890,
+      Iir_Kind_Procedure_Instantiation_Declaration => 900,
+      Iir_Kind_Terminal_Declaration => 909,
+      Iir_Kind_Object_Alias_Declaration => 921,
+      Iir_Kind_Free_Quantity_Declaration => 933,
+      Iir_Kind_Spectrum_Quantity_Declaration => 946,
+      Iir_Kind_Noise_Quantity_Declaration => 958,
+      Iir_Kind_Across_Quantity_Declaration => 974,
+      Iir_Kind_Through_Quantity_Declaration => 990,
+      Iir_Kind_File_Declaration => 1005,
+      Iir_Kind_Guard_Signal_Declaration => 1019,
+      Iir_Kind_Signal_Declaration => 1036,
+      Iir_Kind_Variable_Declaration => 1049,
+      Iir_Kind_Constant_Declaration => 1063,
+      Iir_Kind_Iterator_Declaration => 1075,
+      Iir_Kind_Interface_Constant_Declaration => 1092,
+      Iir_Kind_Interface_Variable_Declaration => 1108,
+      Iir_Kind_Interface_Signal_Declaration => 1129,
+      Iir_Kind_Interface_File_Declaration => 1145,
+      Iir_Kind_Interface_Quantity_Declaration => 1161,
+      Iir_Kind_Interface_Terminal_Declaration => 1173,
+      Iir_Kind_Interface_Type_Declaration => 1184,
+      Iir_Kind_Interface_Package_Declaration => 1197,
+      Iir_Kind_Interface_Function_Declaration => 1215,
+      Iir_Kind_Interface_Procedure_Declaration => 1229,
+      Iir_Kind_Signal_Attribute_Declaration => 1232,
+      Iir_Kind_Suspend_State_Declaration => 1235,
+      Iir_Kind_Identity_Operator => 1239,
+      Iir_Kind_Negation_Operator => 1243,
+      Iir_Kind_Absolute_Operator => 1247,
+      Iir_Kind_Not_Operator => 1251,
+      Iir_Kind_Implicit_Condition_Operator => 1255,
+      Iir_Kind_Condition_Operator => 1259,
+      Iir_Kind_Reduction_And_Operator => 1263,
+      Iir_Kind_Reduction_Or_Operator => 1267,
+      Iir_Kind_Reduction_Nand_Operator => 1271,
+      Iir_Kind_Reduction_Nor_Operator => 1275,
+      Iir_Kind_Reduction_Xor_Operator => 1279,
+      Iir_Kind_Reduction_Xnor_Operator => 1283,
+      Iir_Kind_And_Operator => 1288,
+      Iir_Kind_Or_Operator => 1293,
+      Iir_Kind_Nand_Operator => 1298,
+      Iir_Kind_Nor_Operator => 1303,
+      Iir_Kind_Xor_Operator => 1308,
+      Iir_Kind_Xnor_Operator => 1313,
+      Iir_Kind_Equality_Operator => 1318,
+      Iir_Kind_Inequality_Operator => 1323,
+      Iir_Kind_Less_Than_Operator => 1328,
+      Iir_Kind_Less_Than_Or_Equal_Operator => 1333,
+      Iir_Kind_Greater_Than_Operator => 1338,
+      Iir_Kind_Greater_Than_Or_Equal_Operator => 1343,
+      Iir_Kind_Match_Equality_Operator => 1348,
+      Iir_Kind_Match_Inequality_Operator => 1353,
+      Iir_Kind_Match_Less_Than_Operator => 1358,
+      Iir_Kind_Match_Less_Than_Or_Equal_Operator => 1363,
+      Iir_Kind_Match_Greater_Than_Operator => 1368,
+      Iir_Kind_Match_Greater_Than_Or_Equal_Operator => 1373,
+      Iir_Kind_Sll_Operator => 1378,
+      Iir_Kind_Sla_Operator => 1383,
+      Iir_Kind_Srl_Operator => 1388,
+      Iir_Kind_Sra_Operator => 1393,
+      Iir_Kind_Rol_Operator => 1398,
+      Iir_Kind_Ror_Operator => 1403,
+      Iir_Kind_Addition_Operator => 1408,
+      Iir_Kind_Substraction_Operator => 1413,
+      Iir_Kind_Concatenation_Operator => 1418,
+      Iir_Kind_Multiplication_Operator => 1423,
+      Iir_Kind_Division_Operator => 1428,
+      Iir_Kind_Modulus_Operator => 1433,
+      Iir_Kind_Remainder_Operator => 1438,
+      Iir_Kind_Exponentiation_Operator => 1443,
+      Iir_Kind_Function_Call => 1451,
+      Iir_Kind_Aggregate => 1458,
+      Iir_Kind_Parenthesis_Expression => 1461,
+      Iir_Kind_Qualified_Expression => 1465,
+      Iir_Kind_Type_Conversion => 1470,
+      Iir_Kind_Allocator_By_Expression => 1475,
+      Iir_Kind_Allocator_By_Subtype => 1481,
+      Iir_Kind_Selected_Element => 1489,
+      Iir_Kind_Dereference => 1494,
+      Iir_Kind_Implicit_Dereference => 1499,
+      Iir_Kind_Slice_Name => 1506,
+      Iir_Kind_Indexed_Name => 1512,
+      Iir_Kind_Psl_Prev => 1518,
+      Iir_Kind_Psl_Stable => 1523,
+      Iir_Kind_Psl_Rose => 1528,
+      Iir_Kind_Psl_Fell => 1533,
+      Iir_Kind_Psl_Onehot => 1536,
+      Iir_Kind_Psl_Onehot0 => 1539,
+      Iir_Kind_Psl_Expression => 1541,
+      Iir_Kind_Sensitized_Process_Statement => 1562,
+      Iir_Kind_Process_Statement => 1582,
+      Iir_Kind_Concurrent_Simple_Signal_Assignment => 1595,
+      Iir_Kind_Concurrent_Conditional_Signal_Assignment => 1608,
+      Iir_Kind_Concurrent_Selected_Signal_Assignment => 1622,
+      Iir_Kind_Concurrent_Assertion_Statement => 1630,
+      Iir_Kind_Concurrent_Procedure_Call_Statement => 1637,
+      Iir_Kind_Concurrent_Break_Statement => 1645,
+      Iir_Kind_Psl_Assert_Directive => 1659,
+      Iir_Kind_Psl_Assume_Directive => 1671,
+      Iir_Kind_Psl_Cover_Directive => 1683,
+      Iir_Kind_Psl_Restrict_Directive => 1694,
+      Iir_Kind_Block_Statement => 1708,
+      Iir_Kind_If_Generate_Statement => 1719,
+      Iir_Kind_Case_Generate_Statement => 1728,
+      Iir_Kind_For_Generate_Statement => 1737,
+      Iir_Kind_Component_Instantiation_Statement => 1748,
+      Iir_Kind_Psl_Default_Clock => 1751,
+      Iir_Kind_Generate_Statement_Body => 1762,
+      Iir_Kind_If_Generate_Else_Clause => 1768,
+      Iir_Kind_Simple_Simultaneous_Statement => 1775,
+      Iir_Kind_Simultaneous_Null_Statement => 1779,
+      Iir_Kind_Simultaneous_Procedural_Statement => 1790,
+      Iir_Kind_Simultaneous_Case_Statement => 1799,
+      Iir_Kind_Simultaneous_If_Statement => 1808,
+      Iir_Kind_Simultaneous_Elsif => 1814,
+      Iir_Kind_Simple_Signal_Assignment_Statement => 1825,
+      Iir_Kind_Conditional_Signal_Assignment_Statement => 1836,
+      Iir_Kind_Selected_Waveform_Assignment_Statement => 1848,
+      Iir_Kind_Signal_Force_Assignment_Statement => 1858,
+      Iir_Kind_Signal_Release_Assignment_Statement => 1867,
+      Iir_Kind_Null_Statement => 1871,
+      Iir_Kind_Assertion_Statement => 1878,
+      Iir_Kind_Report_Statement => 1884,
+      Iir_Kind_Wait_Statement => 1892,
+      Iir_Kind_Variable_Assignment_Statement => 1899,
+      Iir_Kind_Conditional_Variable_Assignment_Statement => 1906,
+      Iir_Kind_Return_Statement => 1912,
+      Iir_Kind_For_Loop_Statement => 1923,
+      Iir_Kind_While_Loop_Statement => 1934,
+      Iir_Kind_Next_Statement => 1941,
+      Iir_Kind_Exit_Statement => 1948,
+      Iir_Kind_Case_Statement => 1957,
+      Iir_Kind_Procedure_Call_Statement => 1963,
+      Iir_Kind_Break_Statement => 1970,
+      Iir_Kind_If_Statement => 1980,
+      Iir_Kind_Suspend_State_Statement => 1984,
+      Iir_Kind_Elsif => 1990,
+      Iir_Kind_Character_Literal => 1997,
+      Iir_Kind_Simple_Name => 2004,
+      Iir_Kind_Selected_Name => 2012,
+      Iir_Kind_Operator_Symbol => 2017,
+      Iir_Kind_Reference_Name => 2022,
+      Iir_Kind_External_Constant_Name => 2031,
+      Iir_Kind_External_Signal_Name => 2040,
+      Iir_Kind_External_Variable_Name => 2050,
+      Iir_Kind_Selected_By_All_Name => 2056,
+      Iir_Kind_Parenthesis_Name => 2061,
+      Iir_Kind_Package_Pathname => 2065,
+      Iir_Kind_Absolute_Pathname => 2066,
+      Iir_Kind_Relative_Pathname => 2067,
+      Iir_Kind_Pathname_Element => 2072,
+      Iir_Kind_Base_Attribute => 2074,
+      Iir_Kind_Subtype_Attribute => 2079,
+      Iir_Kind_Element_Attribute => 2084,
+      Iir_Kind_Across_Attribute => 2089,
+      Iir_Kind_Through_Attribute => 2094,
+      Iir_Kind_Nature_Reference_Attribute => 2098,
+      Iir_Kind_Left_Type_Attribute => 2103,
+      Iir_Kind_Right_Type_Attribute => 2108,
+      Iir_Kind_High_Type_Attribute => 2113,
+      Iir_Kind_Low_Type_Attribute => 2118,
+      Iir_Kind_Ascending_Type_Attribute => 2123,
+      Iir_Kind_Image_Attribute => 2129,
+      Iir_Kind_Value_Attribute => 2135,
+      Iir_Kind_Pos_Attribute => 2141,
+      Iir_Kind_Val_Attribute => 2147,
+      Iir_Kind_Succ_Attribute => 2153,
+      Iir_Kind_Pred_Attribute => 2159,
+      Iir_Kind_Leftof_Attribute => 2165,
+      Iir_Kind_Rightof_Attribute => 2171,
+      Iir_Kind_Signal_Slew_Attribute => 2179,
+      Iir_Kind_Quantity_Slew_Attribute => 2187,
+      Iir_Kind_Ramp_Attribute => 2195,
+      Iir_Kind_Zoh_Attribute => 2203,
+      Iir_Kind_Ltf_Attribute => 2211,
+      Iir_Kind_Ztf_Attribute => 2221,
+      Iir_Kind_Dot_Attribute => 2228,
+      Iir_Kind_Integ_Attribute => 2235,
+      Iir_Kind_Above_Attribute => 2243,
+      Iir_Kind_Quantity_Delayed_Attribute => 2251,
+      Iir_Kind_Delayed_Attribute => 2260,
+      Iir_Kind_Stable_Attribute => 2269,
+      Iir_Kind_Quiet_Attribute => 2278,
+      Iir_Kind_Transaction_Attribute => 2287,
+      Iir_Kind_Event_Attribute => 2291,
+      Iir_Kind_Active_Attribute => 2295,
+      Iir_Kind_Last_Event_Attribute => 2299,
+      Iir_Kind_Last_Active_Attribute => 2303,
+      Iir_Kind_Last_Value_Attribute => 2307,
+      Iir_Kind_Driving_Attribute => 2311,
+      Iir_Kind_Driving_Value_Attribute => 2315,
+      Iir_Kind_Behavior_Attribute => 2315,
+      Iir_Kind_Structure_Attribute => 2315,
+      Iir_Kind_Simple_Name_Attribute => 2322,
+      Iir_Kind_Instance_Name_Attribute => 2327,
+      Iir_Kind_Path_Name_Attribute => 2332,
+      Iir_Kind_Left_Array_Attribute => 2339,
+      Iir_Kind_Right_Array_Attribute => 2346,
+      Iir_Kind_High_Array_Attribute => 2353,
+      Iir_Kind_Low_Array_Attribute => 2360,
+      Iir_Kind_Length_Array_Attribute => 2367,
+      Iir_Kind_Ascending_Array_Attribute => 2374,
+      Iir_Kind_Range_Array_Attribute => 2381,
+      Iir_Kind_Reverse_Range_Array_Attribute => 2388,
+      Iir_Kind_Attribute_Name => 2397
      );
 
    function Get_Fields_First (K : Iir_Kind) return Fields_Index is
@@ -11173,7 +11175,8 @@ package body Vhdl.Nodes_Meta is
    function Has_Named_Entity (K : Iir_Kind) return Boolean is
    begin
       case K is
-         when Iir_Kind_Selected_Element
+         when Iir_Kind_Signature
+           | Iir_Kind_Selected_Element
            | Iir_Kind_Character_Literal
            | Iir_Kind_Simple_Name
            | Iir_Kind_Selected_Name
@@ -12622,7 +12625,8 @@ package body Vhdl.Nodes_Meta is
    function Has_Is_Forward_Ref (K : Iir_Kind) return Boolean is
    begin
       case K is
-         when Iir_Kind_Selected_Element
+         when Iir_Kind_Signature
+           | Iir_Kind_Selected_Element
            | Iir_Kind_Character_Literal
            | Iir_Kind_Simple_Name
            | Iir_Kind_Selected_Name
diff --git a/src/vhdl/vhdl-sem_names.adb b/src/vhdl/vhdl-sem_names.adb
index 9dd2b4bd2..c9420ba4b 100644
--- a/src/vhdl/vhdl-sem_names.adb
+++ b/src/vhdl/vhdl-sem_names.adb
@@ -4609,6 +4609,9 @@ package body Vhdl.Sem_Names is
             Sem_Attribute_Name (Name);
          when Iir_Kinds_External_Name =>
             Sem_External_Name (Name);
+         when Iir_Kind_Signature =>
+            Error_Msg_Sem (+Name, "signature cannot be used here");
+            Set_Named_Entity (Name, Create_Error_Name (Name));
          when others =>
             Error_Kind ("sem_name", Name);
       end case;