aboutsummaryrefslogtreecommitdiffstats
path: root/icefuzz/Makefile
blob: ca1c58324cd90f3575be24b73934f6c11f016fbb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
include ../config.mk
export LC_ALL=C
export ICE_SBTIMER_LP=1

#EIGTHK = _8k
THREEH = _384

TESTS =
TESTS += binop
TESTS += pin2pin
TESTS += mesh
TESTS += fanout
TESTS += logic
TESTS += cluster
TESTS += iopack
TESTS += io
TESTS += gbio
TESTS += gbio2
TESTS += prim
TESTS += fflogic
ifneq ($(THREEH),_384)
 TESTS += ram40
 TESTS += mem
 TESTS += pll
 TESTS += aig
endif

database: bitdata_io.txt bitdata_logic.txt bitdata_ramb$(EIGTHK).txt bitdata_ramt$(EIGTHK).txt
ifeq ($(EIGTHK),_8k)
	cp cached_ramb.txt bitdata_ramb.txt
	cp cached_ramt.txt bitdata_ramt.txt
else
	cp cached_ramb_8k.txt bitdata_ramb_8k.txt
	cp cached_ramt_8k.txt bitdata_ramt_8k.txt
endif
	python3 database.py
	python3 export.py
	diff -U0 cached_io.txt bitdata_io.txt || cp -v bitdata_io.txt cached_io.txt
	diff -U0 cached_logic.txt bitdata_logic.txt || cp -v bitdata_logic.txt cached_logic.txt
	diff -U0 cached_ramb.txt bitdata_ramb.txt || cp -v bitdata_ramb.txt cached_ramb.txt
	diff -U0 cached_ramt.txt bitdata_ramt.txt || cp -v bitdata_ramt.txt cached_ramt.txt
	diff -U0 cached_ramb_8k.txt bitdata_ramb_8k.txt || cp -v bitdata_ramb_8k.txt cached_ramb_8k.txt
	diff -U0 cached_ramt_8k.txt bitdata_ramt_8k.txt || cp -v bitdata_ramt_8k.txt cached_ramt_8k.txt

timings:
ifeq ($(EIGTHK),_8k)
	cp tmedges.txt tmedges.tmp
	set -e; for f in work_*/*.vsb; do echo $$f; yosys -q -f verilog -s tmedges.ys $$f; done
	sort -u tmedges.tmp > tmedges.txt && rm -f tmedges.tmp
	python3 timings.py -t timings_hx8k.txt work_*/*.sdf > timings_hx8k.new
	mv timings_hx8k.new timings_hx8k.txt
	python3 timings.py -t timings_lp8k.txt work_*/*.slp > timings_lp8k.new
	mv timings_lp8k.new timings_lp8k.txt
else
 ifeq ($(THREEH),_384)
	cp tmedges.txt tmedges.tmp
	set -e; for f in work_*/*.vsb; do echo $$f; yosys -q -f verilog -s tmedges.ys $$f; done
	sort -u tmedges.tmp > tmedges.txt && rm -f tmedges.tmp
	python3 timings.py -t timings_lp384.txt work_*/*.slp > timings_lp384.new
	mv timings_lp384.new timings_lp384.txt
 else
	cp tmedges.txt tmedges.tmp
	set -e; for f in work_*/*.vsb; do echo $$f; yosys -q -f verilog -s tmedges.ys $$f; done
	sort -u tmedges.tmp > tmedges.txt && rm -f tmedges.tmp
	python3 timings.py -t timings_hx1k.txt work_*/*.sdf > timings_hx1k.new
	mv timings_hx1k.new timings_hx1k.txt
	python3 timings.py -t timings_lp1k.txt work_*/*.slp > timings_lp1k.new
	mv timings_lp1k.new timings_lp1k.txt
 endif
endif

timings_html:
	python3 timings.py -h tmedges.txt -t timings_hx1k.txt -l "HX1K with default temp/volt settings" > timings_hx1k.html
	python3 timings.py -h tmedges.txt -t timings_hx8k.txt -l "HX8K with default temp/volt settings" > timings_hx8k.html
	python3 timings.py -h tmedges.txt -t timings_lp1k.txt -l "LP1K with default temp/volt settings" > timings_lp1k.html
	python3 timings.py -h tmedges.txt -t timings_lp8k.txt -l "LP8K with default temp/volt settings" > timings_lp8k.html
	python3 timings.py -h tmedges.txt -t timings_lp384.txt -l "LP384 with default temp/volt settings" > timings_lp384.html

data_cached.txt: cached_io.txt cached_logic.txt cached_ramb$(EIGTHK).txt cached_ramt$(EIGTHK).txt
	gawk '{ print "io", $$0; }' cached_io.txt > data_cached.new
	gawk '{ print "logic", $$0; }' cached_logic.txt >> data_cached.new
	gawk '{ print "ramb$(EIGTHK)", $$0; }' cached_ramb$(EIGTHK).txt >> data_cached.new
	gawk '{ print "ramt$(EIGTHK)", $$0; }' cached_ramt$(EIGTHK).txt >> data_cached.new
	mv data_cached.new data_cached.txt

bitdata_io.txt: data_cached.txt $(addprefix data_,$(addsuffix .txt,$(TESTS)))
	grep ^io $^ | tr -s ' ' | tr -d '\r' | cut -f2- -d' ' | sort -u > $@

bitdata_logic.txt: data_cached.txt $(addprefix data_,$(addsuffix .txt,$(TESTS)))
	grep ^logic $^ | tr -s ' ' | tr -d '\r' | cut -f2- -d' ' | sort -u > $@

bitdata_ramb$(EIGTHK).txt: data_cached.txt $(addprefix data_,$(addsuffix .txt,$(TESTS)))
	grep ^ramb$(EIGTHK) $^ | tr -s ' ' | tr -d '\r' | cut -f2- -d' ' | sort -u > $@

bitdata_ramt$(EIGTHK).txt: data_cached.txt $(addprefix data_,$(addsuffix .txt,$(TESTS)))
	grep ^ramt$(EIGTHK) $^ | tr -s ' ' | tr -d '\r' | cut -f2- -d' ' | sort -u > $@

datafiles: $(addprefix data_,$(addsuffix .txt,$(TESTS)))

../icepack/icepack:
	$(MAKE) -C ../icepack

define data_template
data_$(1).txt: make_$(1).py ../icepack/icepack
ifeq ($(EIGTHK),_8k)
	ICE8KPINS=1 python3 make_$(1).py
	+ICEDEV=hx8k-ct256 $(MAKE) -C work_$(1)
	python3 extract.py -8 work_$(1)/*.glb > $$@
else
 ifeq ($(THREEH),_384)
	ICE384PINS=1 python3 make_$(1).py
	+ICEDEV=lp384-cm49 $(MAKE) -C work_$(1)
	python3 extract.py -3 work_$(1)/*.glb > $$@
 else
	python3 make_$(1).py
	+$(MAKE) -C work_$(1)
	python3 extract.py work_$(1)/*.glb > $$@
 endif
endif
endef

$(foreach test,$(TESTS),$(eval $(call data_template,$(test))))

%.ok: %.bin
	bash check.sh $<

check: $(addsuffix .ok,$(basename $(wildcard work_binop/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_pin2pin/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_mesh/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_fanout/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_logic/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_cluster/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_iopack/*.bin)))
check: $(addsuffix .ok,$(basename $(wildcard work_pll/*.bin)))

clean:
	rm -rf work_*
	rm -rf data_*.txt
	rm -rf bitdata_*.txt
	rm -rf database_*.txt
	rm -rf timings_*.html

.PHONY: database datafiles check clean
0 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
--  std.standard package declarations.
--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
--  for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.

with Files_Map;
with Name_Table;
with Str_Table;
with Std_Names; use Std_Names;
with Flags; use Flags;
with Vhdl.Utils;
with Vhdl.Sem_Utils;
with Vhdl.Nodes_Utils; use Vhdl.Nodes_Utils;

package body Vhdl.Std_Package is
   type Bound_Array is array (Boolean) of Iir_Int64;
   Low_Bound : constant Bound_Array := (False => -(2 ** 31),
                                        True => -(2 ** 63));
   High_Bound : constant Bound_Array := (False => (2 ** 31) - 1,
                                         True => (2 ** 63) - 1);

   Std_Filename : Name_Id := Null_Identifier;

   --  Could be public.
   Time_Fs_Unit: Iir_Unit_Declaration;
   Time_Ps_Unit: Iir_Unit_Declaration;
   Time_Ns_Unit: Iir_Unit_Declaration;
   Time_Us_Unit: Iir_Unit_Declaration;
   Time_Ms_Unit: Iir_Unit_Declaration;
   Time_Sec_Unit: Iir_Unit_Declaration;
   Time_Min_Unit: Iir_Unit_Declaration;
   Time_Hr_Unit: Iir_Unit_Declaration;

   function Create_Std_Iir (Kind : Iir_Kind) return Iir
   is
      Res : Iir;
   begin
      Res := Create_Iir (Kind);
      Set_Location (Res, Std_Location);
      return Res;
   end Create_Std_Iir;

   function Create_Std_Decl (Kind : Iir_Kind) return Iir
   is
      Res : Iir;
   begin
      Res := Create_Std_Iir (Kind);
      Set_Parent (Res, Standard_Package);
      return Res;
   end Create_Std_Decl;

   function Create_Std_Type_Mark (Ref : Iir) return Iir
   is
      Res : Iir;
   begin
      Res := Utils.Build_Simple_Name (Ref, Std_Location);
      Set_Type (Res, Get_Type (Ref));
      return Res;
   end Create_Std_Type_Mark;

   procedure Create_First_Nodes
   is
      procedure Create_Known_Iir (Kind : Iir_Kind; Val : Iir) is
      begin
         if Create_Std_Iir (Kind) /= Val then
            raise Internal_Error;
         end if;
      end Create_Known_Iir;
   begin
      Std_Filename := Name_Table.Get_Identifier ("*std_standard*");
      Std_Source_File := Files_Map.Create_Virtual_Source_File (Std_Filename);
      Std_Location := Files_Map.File_To_Location (Std_Source_File);

      if Create_Iir_Error /= Error_Mark then
         raise Internal_Error;
      end if;
      Set_Location (Error_Mark, Std_Location);

      Create_Known_Iir (Iir_Kind_Integer_Type_Definition,
                        Universal_Integer_Type_Definition);
      Create_Known_Iir (Iir_Kind_Floating_Type_Definition,
                        Universal_Real_Type_Definition);

      Create_Known_Iir (Iir_Kind_Integer_Type_Definition,
                        Convertible_Integer_Type_Definition);
      Create_Known_Iir (Iir_Kind_Floating_Type_Definition,
                        Convertible_Real_Type_Definition);

      Create_Known_Iir (Iir_Kind_Wildcard_Type_Definition,
                        Wildcard_Any_Type);
      Create_Known_Iir (Iir_Kind_Wildcard_Type_Definition,
                        Wildcard_Any_Aggregate_Type);
      Create_Known_Iir (Iir_Kind_Wildcard_Type_Definition,
                        Wildcard_Any_String_Type);
      Create_Known_Iir (Iir_Kind_Wildcard_Type_Definition,
                        Wildcard_Any_Access_Type);
   end Create_First_Nodes;

   procedure Create_Std_Standard_Package (Parent : Iir_Library_Declaration)
   is
      function Get_Std_Character (Char: Character) return Name_Id
        renames Name_Table.Get_Identifier;

      procedure Set_Std_Identifier (Decl : Iir; Name : Name_Id) is
      begin
         Set_Identifier (Decl, Name);
         Set_Visible_Flag (Decl, True);
      end Set_Std_Identifier;

      function Create_Std_Integer (Val : Iir_Int64; Lit_Type : Iir)
        return Iir_Integer_Literal
      is
         Res : Iir_Integer_Literal;
      begin
         Res := Create_Std_Iir (Iir_Kind_Integer_Literal);
         Set_Value (Res, Val);
         Set_Type (Res, Lit_Type);
         Set_Expr_Staticness (Res, Locally);
         return Res;
      end Create_Std_Integer;

      function Create_Std_Fp (Val : Iir_Fp64; Lit_Type : Iir)
        return Iir_Floating_Point_Literal
      is
         Res : Iir_Floating_Point_Literal;
      begin
         Res := Create_Std_Iir (Iir_Kind_Floating_Point_Literal);
         Set_Fp_Value (Res, Val);
         Set_Type (Res, Lit_Type);
         Set_Expr_Staticness (Res, Locally);
         return Res;
      end Create_Std_Fp;

      function Create_Std_Range_Expr (Left, Right : Iir; Rtype : Iir)
        return Iir
      is
         Res : Iir;
      begin
         Res := Create_Std_Iir (Iir_Kind_Range_Expression);
         Set_Left_Limit (Res, Left);
         Set_Left_Limit_Expr (Res, Left);
         Set_Direction (Res, Iir_To);
         Set_Right_Limit (Res, Right);
         Set_Right_Limit_Expr (Res, Right);
         Set_Expr_Staticness (Res, Locally);
         Set_Type (Res, Rtype);
         return Res;
      end Create_Std_Range_Expr;

      function Create_Std_Literal (Name : Name_Id;
                                   Pos : Natural;
                                   Sub_Type : Iir_Enumeration_Type_Definition)
                                  return Iir_Enumeration_Literal
      is
         List : constant Iir_Flist := Get_Enumeration_Literal_List (Sub_Type);
         Res : Iir_Enumeration_Literal;
      begin
         Res := Create_Std_Decl (Iir_Kind_Enumeration_Literal);
         Set_Std_Identifier (Res, Name);
         Set_Type (Res, Sub_Type);
         Set_Expr_Staticness (Res, Locally);
         Set_Name_Staticness (Res, Locally);
         Set_Enum_Pos (Res, Iir_Int32 (Pos));
         Vhdl.Sem_Utils.Compute_Subprogram_Hash (Res);
         Set_Nth_Element (List, Pos, Res);
         return Res;
      end Create_Std_Literal;

      --  Append a declaration DECL to Standard_Package.
      Last_Decl : Iir := Null_Iir;
      procedure Add_Decl (Decl : Iir) is
      begin
         if Last_Decl = Null_Iir then
            Set_Declaration_Chain (Standard_Package, Decl);
         else
            Set_Chain (Last_Decl, Decl);
         end if;
         Last_Decl := Decl;
      end Add_Decl;

      procedure Add_Implicit_Operations (Decl : Iir)
      is
         Nxt : Iir;
      begin
         Vhdl.Sem_Utils.Create_Implicit_Operations (Decl, True);

         --  Update Last_Decl
         loop
            Nxt := Get_Chain (Last_Decl);
            exit when Nxt = Null_Iir;
            Last_Decl := Nxt;
         end loop;
      end Add_Implicit_Operations;

      --  Find implicit declaration of "**" for type declaration TYPE_DECL
      --  and append it at the current end of std_package.
      procedure Relocate_Exp_At_End (Type_Decl : Iir)
      is
         Prev_El, El : Iir;
      begin
         pragma Assert
           (Get_Kind (Type_Decl) = Iir_Kind_Anonymous_Type_Declaration);
         El := Type_Decl;
         loop
            Prev_El := El;
            El := Get_Chain (El);
            pragma Assert (Get_Kind (El) = Iir_Kind_Function_Declaration);
            exit when
              Get_Implicit_Definition (El) = Iir_Predefined_Integer_Exp;
            exit when
              Get_Implicit_Definition (El) = Iir_Predefined_Floating_Exp;
         end loop;

         --  EL must not be the last element, otherwise Add_Decl will break
         --  the chain.
         pragma Assert (Is_Valid (Get_Chain (El)));

         --  Remove from the chain.
         Set_Chain (Prev_El, Get_Chain (El));
         Set_Chain (El, Null_Iir);

         --  Append.
         Add_Decl (El);
      end Relocate_Exp_At_End;

      procedure Create_Std_Type (Decl : out Iir; Def : Iir; Name : Name_Id) is
      begin
         Decl := Create_Std_Decl (Iir_Kind_Type_Declaration);
         Set_Std_Identifier (Decl, Name);
         Set_Type_Definition (Decl, Def);
         Add_Decl (Decl);
         Set_Type_Declarator (Def, Decl);
      end Create_Std_Type;

      procedure Create_Integer_Type (Type_Definition : Iir;
                                     Type_Decl : out Iir;
                                     Type_Name : Name_Id)
      is
      begin
         --Integer_Type_Definition :=
         --  Create_Std_Iir (Iir_Kind_Integer_Type_Definition);
         Set_Base_Type (Type_Definition, Type_Definition);
         Set_Type_Staticness (Type_Definition, Locally);
         Set_Signal_Type_Flag (Type_Definition, True);
         Set_Has_Signal_Flag (Type_Definition, not Flags.Flag_Whole_Analyze);

         Type_Decl := Create_Std_Decl (Iir_Kind_Anonymous_Type_Declaration);
         Set_Identifier (Type_Decl, Type_Name);
         Set_Type_Definition (Type_Decl, Type_Definition);
         Set_Type_Declarator (Type_Definition, Type_Decl);
      end Create_Integer_Type;

      procedure Create_Integer_Subtype (Type_Definition : Iir;
                                        Type_Decl : Iir;
                                        Subtype_Definition : out Iir;
                                        Subtype_Decl : out Iir;
                                        Is_64 : Boolean)
      is
         Constraint : Iir;
      begin
         Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Integer_Subtype_Definition);
         Set_Base_Type (Subtype_Definition, Type_Definition);
         Constraint := Create_Std_Range_Expr
           (Create_Std_Integer (Low_Bound (Is_64),
                                Universal_Integer_Type_Definition),
            Create_Std_Integer (High_Bound (Is_64),
                                Universal_Integer_Type_Definition),
            Universal_Integer_Type_Definition);
         Set_Range_Constraint (Subtype_Definition, Constraint);
         Set_Type_Staticness (Subtype_Definition, Locally);
         Set_Signal_Type_Flag (Subtype_Definition, True);
         Set_Has_Signal_Flag (Subtype_Definition,
                              not Flags.Flag_Whole_Analyze);

         --  subtype is
         Subtype_Decl := Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Std_Identifier (Subtype_Decl, Get_Identifier (Type_Decl));
         Set_Type (Subtype_Decl, Subtype_Definition);
         Set_Subtype_Indication (Subtype_Decl, Subtype_Definition);
         Set_Type_Declarator (Subtype_Definition, Subtype_Decl);
         Set_Subtype_Definition (Type_Decl, Subtype_Definition);
      end Create_Integer_Subtype;

      --  Create an array of EL_TYPE, indexed by Natural.
      procedure Create_Array_Type
        (Def : out Iir; Decl : out Iir; El_Decl : Iir; Name : Name_Id)
      is
         Index_List : Iir_Flist;
         Index : Iir;
         Element : Iir;
      begin
         Element := Create_Std_Type_Mark (El_Decl);
         Index := Create_Std_Type_Mark (Natural_Subtype_Declaration);

         Def := Create_Std_Iir (Iir_Kind_Array_Type_Definition);
         Set_Base_Type (Def, Def);

         Index_List := Create_Iir_Flist (1);
         Set_Index_Subtype_Definition_List (Def, Index_List);
         Set_Index_Subtype_List (Def, Index_List);
         Set_Nth_Element (Index_List, 0, Index);

         Set_Element_Subtype_Indication (Def, Element);
         Set_Element_Subtype (Def, Get_Type (El_Decl));
         Set_Type_Staticness (Def, None);
         Set_Signal_Type_Flag (Def, True);
         Set_Has_Signal_Flag (Def, not Flags.Flag_Whole_Analyze);

         Create_Std_Type (Decl, Def, Name);

         Add_Implicit_Operations (Decl);
      end Create_Array_Type;

      --  Create:
      --  function TO_STRING (VALUE: inter_type) return STRING;
      procedure Create_To_String (Inter_Type : Iir;
                                  Imp : Iir_Predefined_Functions;
                                  Name : Name_Id := Std_Names.Name_To_String;
                                  Inter2_Id : Name_Id := Null_Identifier;
                                  Inter2_Type : Iir := Null_Iir)
      is
         Decl : Iir_Function_Declaration;
         Inter : Iir_Interface_Constant_Declaration;
         Inter2 : Iir_Interface_Constant_Declaration;
      begin
         Decl := Create_Std_Decl (Iir_Kind_Function_Declaration);
         Set_Std_Identifier (Decl, Name);
         Set_Return_Type (Decl, String_Type_Definition);
         Set_Pure_Flag (Decl, True);
         Set_Implicit_Definition (Decl, Imp);

         Inter := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
         Set_Identifier (Inter, Std_Names.Name_Value);
         Set_Type (Inter, Inter_Type);
         Set_Mode (Inter, Iir_In_Mode);
         Set_Visible_Flag (Inter, True);
         Set_Interface_Declaration_Chain (Decl, Inter);

         if Inter2_Id /= Null_Identifier then
            Inter2 := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
            Set_Identifier (Inter2, Inter2_Id);
            Set_Type (Inter2, Inter2_Type);
            Set_Mode (Inter2, Iir_In_Mode);
            Set_Visible_Flag (Inter2, True);
            Set_Chain (Inter, Inter2);
         end if;

         Vhdl.Sem_Utils.Compute_Subprogram_Hash (Decl);
         Add_Decl (Decl);
      end Create_To_String;

      --  Create:
      --  function NAME (signal S : I inter_type) return BOOLEAN;
      procedure Create_Edge_Function
        (Name : Name_Id; Func : Iir_Predefined_Functions; Inter_Type : Iir)
      is
         Decl : Iir_Function_Declaration;
         Inter : Iir_Interface_Constant_Declaration;
      begin
         Decl := Create_Std_Decl (Iir_Kind_Function_Declaration);
         Set_Std_Identifier (Decl, Name);
         Set_Return_Type (Decl, Boolean_Type_Definition);
         Set_Pure_Flag (Decl, True);
         Set_Implicit_Definition (Decl, Func);

         Inter := Create_Iir (Iir_Kind_Interface_Signal_Declaration);
         Set_Identifier (Inter, Std_Names.Name_S);
         Set_Type (Inter, Inter_Type);
         Set_Mode (Inter, Iir_In_Mode);
         Set_Visible_Flag (Inter, True);
         Set_Interface_Declaration_Chain (Decl, Inter);

         Vhdl.Sem_Utils.Compute_Subprogram_Hash (Decl);
         Add_Decl (Decl);
      end Create_Edge_Function;

      procedure Create_Wildcard_Type (Def : Iir; Name : String)
      is
         Decl : Iir;
      begin
         Decl := Create_Std_Decl (Iir_Kind_Type_Declaration);
         Set_Identifier (Decl, Name_Table.Get_Identifier (Name));
         Set_Base_Type (Def, Def);
         Set_Type_Staticness (Def, None);
         Set_Type_Definition (Decl, Def);
         Set_Type_Declarator (Def, Decl);

         Set_Chain (Decl, Wildcard_Type_Declaration_Chain);
         Wildcard_Type_Declaration_Chain := Decl;
      end Create_Wildcard_Type;

   begin
      --  Create design file.
      Std_Standard_File := Create_Std_Iir (Iir_Kind_Design_File);
      Set_Parent (Std_Standard_File, Parent);
      Set_Design_File_Filename (Std_Standard_File, Std_Filename);

      declare
         Std_Time_Stamp : constant Time_Stamp_String :=
           "20020601000000.000";
         Id : Time_Stamp_Id;
      begin
         Id := Time_Stamp_Id (Str_Table.Create_String8);
         for I in Time_Stamp_String'Range loop
            Str_Table.Append_String8_Char (Std_Time_Stamp (I));
         end loop;
         Set_Analysis_Time_Stamp (Std_Standard_File, Id);
      end;

      --  Create design unit.
      Std_Standard_Unit := Create_Std_Iir (Iir_Kind_Design_Unit);
      Set_Identifier (Std_Standard_Unit, Name_Standard);
      Set_First_Design_Unit (Std_Standard_File, Std_Standard_Unit);
      Set_Last_Design_Unit (Std_Standard_File, Std_Standard_Unit);
      Set_Design_File (Std_Standard_Unit, Std_Standard_File);
      Set_Date_State (Std_Standard_Unit, Date_Analyze);
      Set_Dependence_List (Std_Standard_Unit, Create_Iir_List);

      Set_Date (Std_Standard_Unit, Date_Valid'First);

      -- Adding "package STANDARD is"
      Standard_Package := Create_Std_Iir (Iir_Kind_Package_Declaration);
      Set_Std_Identifier (Standard_Package, Name_Standard);
      Set_Need_Body (Standard_Package, False);

      Set_Library_Unit (Std_Standard_Unit, Standard_Package);
      Set_Design_Unit (Standard_Package, Std_Standard_Unit);

      -- boolean
      begin
         -- (false, true)
         Boolean_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Base_Type (Boolean_Type_Definition, Boolean_Type_Definition);
         Set_Enumeration_Literal_List
           (Boolean_Type_Definition, Create_Iir_Flist (2));
         Boolean_False := Create_Std_Literal
           (Name_False, 0, Boolean_Type_Definition);
         Boolean_True := Create_Std_Literal
           (Name_True, 1, Boolean_Type_Definition);
         Set_Type_Staticness (Boolean_Type_Definition, Locally);
         Set_Signal_Type_Flag (Boolean_Type_Definition, True);
         Set_Has_Signal_Flag (Boolean_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         -- type boolean is
         Create_Std_Type (Boolean_Type_Declaration, Boolean_Type_Definition,
                          Name_Boolean);

         Utils.Create_Range_Constraint_For_Enumeration_Type
           (Boolean_Type_Definition);
         Add_Implicit_Operations (Boolean_Type_Declaration);
      end;

      if Vhdl_Std >= Vhdl_08 then
         --  Rising_Edge and Falling_Edge
         Create_Edge_Function
           (Std_Names.Name_Rising_Edge, Iir_Predefined_Boolean_Rising_Edge,
            Boolean_Type_Definition);
         Create_Edge_Function
           (Std_Names.Name_Falling_Edge, Iir_Predefined_Boolean_Falling_Edge,
            Boolean_Type_Definition);
      end if;

      -- bit.
      begin
         -- ('0', '1')
         Bit_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Enumeration_Literal_List
           (Bit_Type_Definition, Create_Iir_Flist (2));
         Set_Base_Type (Bit_Type_Definition, Bit_Type_Definition);
         Set_Is_Character_Type (Bit_Type_Definition, True);
         Bit_0 := Create_Std_Literal
           (Get_Std_Character ('0'), 0, Bit_Type_Definition);
         Bit_1 := Create_Std_Literal
           (Get_Std_Character ('1'), 1, Bit_Type_Definition);
         Set_Type_Staticness (Bit_Type_Definition, Locally);
         Set_Signal_Type_Flag (Bit_Type_Definition, True);
         Set_Has_Signal_Flag (Bit_Type_Definition,
                              not Flags.Flag_Whole_Analyze);
         Set_Only_Characters_Flag (Bit_Type_Definition, True);

         -- type bit is
         Create_Std_Type (Bit_Type_Declaration, Bit_Type_Definition, Name_Bit);

         Utils.Create_Range_Constraint_For_Enumeration_Type
           (Bit_Type_Definition);
         Add_Implicit_Operations (Bit_Type_Declaration);
      end;

      if Vhdl_Std >= Vhdl_08 then
         --  Rising_Edge and Falling_Edge
         Create_Edge_Function
           (Std_Names.Name_Rising_Edge, Iir_Predefined_Bit_Rising_Edge,
            Bit_Type_Definition);
         Create_Edge_Function
           (Std_Names.Name_Falling_Edge, Iir_Predefined_Bit_Falling_Edge,
            Bit_Type_Definition);
      end if;

      -- characters.
      declare
         El: Iir;
         pragma Unreferenced (El);
         Len : Natural;
      begin
         Character_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Base_Type (Character_Type_Definition, Character_Type_Definition);
         Set_Is_Character_Type (Character_Type_Definition, True);
         if Vhdl_Std = Vhdl_87 then
            Len := 128;
         else
            Len := 256;
         end if;
         Set_Enumeration_Literal_List
           (Character_Type_Definition, Create_Iir_Flist (Len));

         for I in Name_Nul .. Name_Usp loop
            El := Create_Std_Literal
              (I, Natural (I - Name_Nul), Character_Type_Definition);
         end loop;
         for I in Character'(' ') .. Character'('~') loop
            El := Create_Std_Literal
              (Get_Std_Character (I), Character'Pos (I),
               Character_Type_Definition);
         end loop;
         El := Create_Std_Literal (Name_Del, 127, Character_Type_Definition);
         if Vhdl_Std /= Vhdl_87 then
            for I in Name_C128 .. Name_C159 loop
               El := Create_Std_Literal
                 (I, 128 + Natural (I - Name_C128), Character_Type_Definition);
            end loop;
            for I in Character'Val (160) .. Character'Val (255) loop
               El := Create_Std_Literal
                 (Get_Std_Character (I), Character'Pos (I),
                  Character_Type_Definition);
            end loop;
         end if;
         Set_Type_Staticness (Character_Type_Definition, Locally);
         Set_Signal_Type_Flag (Character_Type_Definition, True);
         Set_Has_Signal_Flag (Character_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         -- type character is
         Create_Std_Type
           (Character_Type_Declaration, Character_Type_Definition,
            Name_Character);

         Utils.Create_Range_Constraint_For_Enumeration_Type
           (Character_Type_Definition);
         Add_Implicit_Operations (Character_Type_Declaration);
      end;

      -- severity level.
      begin
         -- (note, warning, error, failure)
         Severity_Level_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Base_Type (Severity_Level_Type_Definition,
                        Severity_Level_Type_Definition);
         Set_Enumeration_Literal_List
           (Severity_Level_Type_Definition, Create_Iir_Flist (4));

         Severity_Level_Note := Create_Std_Literal
           (Name_Note, 0, Severity_Level_Type_Definition);
         Severity_Level_Warning := Create_Std_Literal
           (Name_Warning, 1, Severity_Level_Type_Definition);
         Severity_Level_Error := Create_Std_Literal
           (Name_Error, 2, Severity_Level_Type_Definition);
         Severity_Level_Failure := Create_Std_Literal
           (Name_Failure, 3, Severity_Level_Type_Definition);
         Set_Type_Staticness (Severity_Level_Type_Definition, Locally);
         Set_Signal_Type_Flag (Severity_Level_Type_Definition, True);
         Set_Has_Signal_Flag (Severity_Level_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         -- type severity_level is
         Create_Std_Type
           (Severity_Level_Type_Declaration, Severity_Level_Type_Definition,
            Name_Severity_Level);

         Utils.Create_Range_Constraint_For_Enumeration_Type
           (Severity_Level_Type_Definition);
         Add_Implicit_Operations (Severity_Level_Type_Declaration);
      end;

      -- universal integer
      begin
         Create_Integer_Type (Universal_Integer_Type_Definition,
                              Universal_Integer_Type_Declaration,
                              Name_Universal_Integer);
         Add_Decl (Universal_Integer_Type_Declaration);

         Create_Integer_Subtype (Universal_Integer_Type_Definition,
                                 Universal_Integer_Type_Declaration,
                                 Universal_Integer_Subtype_Definition,
                                 Universal_Integer_Subtype_Declaration,
                                 Flags.Flag_Time_64 or Flags.Flag_Integer_64);

         Add_Decl (Universal_Integer_Subtype_Declaration);
         Set_Subtype_Definition (Universal_Integer_Type_Declaration,
                                 Universal_Integer_Subtype_Definition);

         --  Do not create implicit operations yet, since "**" needs integer
         --  type.
      end;

      --  Universal integer constant 1.
      Universal_Integer_One :=
        Create_Std_Integer (1, Universal_Integer_Type_Definition);

      -- Universal real.
      declare
         Constraint : Iir_Range_Expression;
      begin
         Set_Base_Type (Universal_Real_Type_Definition,
                        Universal_Real_Type_Definition);
         Set_Type_Staticness (Universal_Real_Type_Definition, Locally);
         Set_Signal_Type_Flag (Universal_Real_Type_Definition, True);
         Set_Has_Signal_Flag (Universal_Real_Type_Definition, False);

         --  type universal_real is ...
         Universal_Real_Type_Declaration :=
           Create_Std_Decl (Iir_Kind_Anonymous_Type_Declaration);
         Set_Identifier (Universal_Real_Type_Declaration, Name_Universal_Real);
         Set_Type_Definition (Universal_Real_Type_Declaration,
                              Universal_Real_Type_Definition);
         Set_Type_Declarator (Universal_Real_Type_Definition,
                              Universal_Real_Type_Declaration);
         Add_Decl (Universal_Real_Type_Declaration);

         Universal_Real_Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Floating_Subtype_Definition);
         Set_Base_Type (Universal_Real_Subtype_Definition,
                        Universal_Real_Type_Definition);
         Constraint := Create_Std_Range_Expr
           (Create_Std_Fp (Iir_Fp64'First, Universal_Real_Type_Definition),
            Create_Std_Fp (Iir_Fp64'Last, Universal_Real_Type_Definition),
            Universal_Real_Type_Definition);
         Set_Range_Constraint (Universal_Real_Subtype_Definition, Constraint);
         Set_Type_Staticness (Universal_Real_Subtype_Definition, Locally);
         Set_Signal_Type_Flag (Universal_Real_Subtype_Definition, True);
         Set_Has_Signal_Flag (Universal_Real_Subtype_Definition, False);

         --  subtype universal_real is ...
         Universal_Real_Subtype_Declaration :=
           Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Identifier (Universal_Real_Subtype_Declaration,
                         Name_Universal_Real);
         Set_Type (Universal_Real_Subtype_Declaration,
                   Universal_Real_Subtype_Definition);
         Set_Subtype_Indication (Universal_Real_Subtype_Declaration,
                                 Universal_Real_Subtype_Definition);
         Set_Type_Declarator (Universal_Real_Subtype_Definition,
                              Universal_Real_Subtype_Declaration);
         Set_Subtype_Definition (Universal_Real_Type_Declaration,
                                 Universal_Real_Subtype_Definition);

         Add_Decl (Universal_Real_Subtype_Declaration);

         --  Do not create implicit operations yet, since "**" needs integer
         --  type.
      end;

      -- Convertible type.
      begin
         Create_Integer_Type (Convertible_Integer_Type_Definition,
                              Convertible_Integer_Type_Declaration,
                              Name_Convertible_Integer);
         Create_Integer_Subtype (Convertible_Integer_Type_Definition,
                                 Convertible_Integer_Type_Declaration,
                                 Convertible_Integer_Subtype_Definition,
                                 Convertible_Integer_Subtype_Declaration,
                                 Flags.Flag_Time_64 or Flags.Flag_Integer_64);

         --  Not added in std.standard.
      end;

      begin
         Set_Base_Type (Convertible_Real_Type_Definition,
                        Convertible_Real_Type_Definition);
         Set_Type_Staticness (Convertible_Real_Type_Definition, Locally);
         Set_Signal_Type_Flag (Convertible_Real_Type_Definition, True);
         Set_Has_Signal_Flag (Convertible_Real_Type_Definition, False);

         Convertible_Real_Type_Declaration :=
           Create_Std_Decl (Iir_Kind_Anonymous_Type_Declaration);
         Set_Identifier (Convertible_Real_Type_Declaration,
                         Name_Convertible_Real);
         Set_Type_Definition (Convertible_Real_Type_Declaration,
                              Convertible_Real_Type_Definition);
         Set_Type_Declarator (Convertible_Real_Type_Definition,
                              Convertible_Real_Type_Declaration);
      end;

      -- integer type.
      begin
         Integer_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Integer_Type_Definition);
         Create_Integer_Type (Integer_Type_Definition,
                              Integer_Type_Declaration,
                              Name_Integer);
         Add_Decl (Integer_Type_Declaration);

         --  Now that Integer is declared, create operations for universal
         --  types.  They will be inserted just after the type declaration,
         --  but cannot be done before as "**" relies on Integer.
         Add_Implicit_Operations (Universal_Integer_Type_Declaration);
         Add_Implicit_Operations (Universal_Real_Type_Declaration);

         --  Don't define "**" for universal types before the declaration of
         --  Integer, so move them.
         Relocate_Exp_At_End (Universal_Integer_Type_Declaration);
         Relocate_Exp_At_End (Universal_Real_Type_Declaration);

         Add_Implicit_Operations (Integer_Type_Declaration);

         Create_Integer_Subtype (Integer_Type_Definition,
                                 Integer_Type_Declaration,
                                 Integer_Subtype_Definition,
                                 Integer_Subtype_Declaration,
                                 Flags.Flag_Integer_64);
         Add_Decl (Integer_Subtype_Declaration);
      end;

      -- Real type.
      declare
         Constraint : Iir_Range_Expression;
      begin
         Real_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Floating_Type_Definition);
         Set_Base_Type (Real_Type_Definition, Real_Type_Definition);
         Set_Type_Staticness (Real_Type_Definition, Locally);
         Set_Signal_Type_Flag (Real_Type_Definition, True);
         Set_Has_Signal_Flag (Real_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         Real_Type_Declaration :=
           Create_Std_Decl (Iir_Kind_Anonymous_Type_Declaration);
         Set_Identifier (Real_Type_Declaration, Name_Real);
         Set_Type_Definition (Real_Type_Declaration, Real_Type_Definition);
         Set_Type_Declarator (Real_Type_Definition, Real_Type_Declaration);
         Add_Decl (Real_Type_Declaration);

         Add_Implicit_Operations (Real_Type_Declaration);

         Real_Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Floating_Subtype_Definition);
         Set_Base_Type (Real_Subtype_Definition, Real_Type_Definition);
         Constraint := Create_Std_Range_Expr
           (Create_Std_Fp (Iir_Fp64'First, Universal_Real_Type_Definition),
            Create_Std_Fp (Iir_Fp64'Last, Universal_Real_Type_Definition),
             Universal_Real_Type_Definition);
         Set_Range_Constraint (Real_Subtype_Definition, Constraint);
         Set_Type_Staticness (Real_Subtype_Definition, Locally);
         Set_Signal_Type_Flag (Real_Subtype_Definition, True);
         Set_Has_Signal_Flag (Real_Subtype_Definition,
                              not Flags.Flag_Whole_Analyze);

         Real_Subtype_Declaration :=
           Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Std_Identifier (Real_Subtype_Declaration, Name_Real);
         Set_Type (Real_Subtype_Declaration, Real_Subtype_Definition);
         Set_Subtype_Indication (Real_Subtype_Declaration,
                                 Real_Subtype_Definition);
         Set_Type_Declarator
           (Real_Subtype_Definition, Real_Subtype_Declaration);
         Add_Decl (Real_Subtype_Declaration);

         Set_Subtype_Definition
           (Real_Type_Declaration, Real_Subtype_Definition);
      end;

      -- time definition
      declare
         Time_Staticness : Iir_Staticness;
         First_Unit, Last_Unit : Iir_Unit_Declaration;

         function Create_Std_Phys_Lit_Wo_Unit (Value : Iir_Int64; Unit : Iir)
                                      return Iir_Physical_Int_Literal
         is
            Lit: Iir_Physical_Int_Literal;
         begin
            Lit := Create_Std_Iir (Iir_Kind_Physical_Int_Literal);
            Set_Value (Lit, Value);
            pragma Assert (Get_Kind (Unit) = Iir_Kind_Unit_Declaration);
            Set_Physical_Unit (Lit, Unit);
            Set_Type (Lit, Time_Type_Definition);
            Set_Expr_Staticness (Lit, Time_Staticness);
            return Lit;
         end Create_Std_Phys_Lit_Wo_Unit;

         function Create_Std_Phys_Lit (Value : Iir_Int64; Unit : Iir)
                                      return Iir_Physical_Int_Literal
         is
            Lit: Iir_Physical_Int_Literal;
            Unit_Name : Iir;
         begin
            Lit := Create_Std_Phys_Lit_Wo_Unit (Value, Unit);
            Unit_Name := Create_Std_Iir (Iir_Kind_Simple_Name);
            Set_Identifier (Unit_Name, Get_Identifier (Unit));
            Set_Unit_Name (Lit, Unit_Name);
            return Lit;
         end Create_Std_Phys_Lit;

         procedure Create_Unit (Unit : out Iir_Unit_Declaration;
                                Multiplier_Value : Iir_Int64;
                                Multiplier : in Iir_Unit_Declaration;
                                Name : Name_Id)
         is
            Lit, Lit1 : Iir_Physical_Int_Literal;
         begin
            Unit := Create_Std_Decl (Iir_Kind_Unit_Declaration);
            Set_Std_Identifier (Unit, Name);
            Set_Type (Unit, Time_Type_Definition);

            Lit1 := Create_Std_Phys_Lit (Multiplier_Value, Multiplier);
            Lit := Create_Std_Phys_Lit
              (Multiplier_Value
               * Get_Value (Get_Physical_Literal (Multiplier)),
               Get_Physical_Unit (Get_Physical_Literal (Multiplier)));
            Set_Literal_Origin (Lit, Lit1);
            Set_Physical_Literal (Unit, Lit);

            Set_Expr_Staticness (Unit, Time_Staticness);
            Set_Name_Staticness (Unit, Locally);
            Chain_Append (First_Unit, Last_Unit, Unit);
         end Create_Unit;

         Constraint : Iir_Range_Expression;
      begin
         if Vhdl_Std >= Vhdl_93c then
            Time_Staticness := Globally;
         else
            Time_Staticness := Locally;
         end if;

         Time_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Physical_Type_Definition);
         Set_Base_Type (Time_Type_Definition, Time_Type_Definition);
         Set_Type_Staticness (Time_Type_Definition, Locally);--Time_Staticness
         Set_Signal_Type_Flag (Time_Type_Definition, True);
         Set_Has_Signal_Flag (Time_Type_Definition,
                              not Flags.Flag_Whole_Analyze);
         Set_End_Has_Reserved_Id (Time_Type_Definition, True);

         Chain_Init (First_Unit, Last_Unit);

         Time_Fs_Unit := Create_Std_Decl (Iir_Kind_Unit_Declaration);
         Set_Std_Identifier (Time_Fs_Unit, Name_Fs);
         Set_Type (Time_Fs_Unit, Time_Type_Definition);
         Set_Expr_Staticness (Time_Fs_Unit, Time_Staticness);
         Set_Name_Staticness (Time_Fs_Unit, Locally);
         Set_Physical_Literal
           (Time_Fs_Unit, Create_Std_Phys_Lit (1, Time_Fs_Unit));
         Chain_Append (First_Unit, Last_Unit, Time_Fs_Unit);

         Create_Unit (Time_Ps_Unit, 1000, Time_Fs_Unit, Name_Ps);
         Create_Unit (Time_Ns_Unit, 1000, Time_Ps_Unit, Name_Ns);
         Create_Unit (Time_Us_Unit, 1000, Time_Ns_Unit, Name_Us);
         Create_Unit (Time_Ms_Unit, 1000, Time_Us_Unit, Name_Ms);
         Create_Unit (Time_Sec_Unit, 1000, Time_Ms_Unit, Name_Sec);
         Create_Unit (Time_Min_Unit, 60, Time_Sec_Unit, Name_Min);
         Create_Unit (Time_Hr_Unit, 60, Time_Min_Unit, Name_Hr);

         --  type is
         Time_Type_Declaration :=
           Create_Std_Decl (Iir_Kind_Anonymous_Type_Declaration);
         Set_Identifier (Time_Type_Declaration, Name_Time);
         Set_Type_Definition (Time_Type_Declaration, Time_Type_Definition);
         Set_Type_Declarator (Time_Type_Definition, Time_Type_Declaration);
         Set_Unit_Chain (Time_Type_Definition, First_Unit);
         Add_Decl (Time_Type_Declaration);

         Add_Implicit_Operations (Time_Type_Declaration);

         Time_Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Physical_Subtype_Definition);
         Constraint := Create_Std_Range_Expr
           (Create_Std_Phys_Lit_Wo_Unit (Low_Bound (Flags.Flag_Time_64),
                                         Time_Fs_Unit),
            Create_Std_Phys_Lit_Wo_Unit (High_Bound (Flags.Flag_Time_64),
                                         Time_Fs_Unit),
            Time_Type_Definition);
         Set_Range_Constraint (Time_Subtype_Definition, Constraint);
         Set_Base_Type (Time_Subtype_Definition, Time_Type_Definition);
         --Set_Subtype_Type_Mark (Time_Subtype_Definition,
         --                       Time_Type_Definition);
         Set_Type_Staticness (Time_Subtype_Definition, Time_Staticness);
         Set_Signal_Type_Flag (Time_Subtype_Definition, True);
         Set_Has_Signal_Flag (Time_Subtype_Definition,
                              not Flags.Flag_Whole_Analyze);

         --  subtype time is
         Time_Subtype_Declaration :=
           Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Std_Identifier (Time_Subtype_Declaration, Name_Time);
         Set_Type (Time_Subtype_Declaration, Time_Subtype_Definition);
         Set_Subtype_Indication (Time_Subtype_Declaration,
                                 Time_Subtype_Definition);
         Set_Type_Declarator (Time_Subtype_Definition,
                              Time_Subtype_Declaration);
         Add_Decl (Time_Subtype_Declaration);
         Set_Subtype_Definition
           (Time_Type_Declaration, Time_Subtype_Definition);

         --  VHDL93
         --  subtype DELAY_LENGTH is TIME range 0 to TIME'HIGH
         if Vhdl_Std >= Vhdl_93c then
            Delay_Length_Subtype_Definition :=
              Create_Std_Iir (Iir_Kind_Physical_Subtype_Definition);
            Set_Subtype_Type_Mark
              (Delay_Length_Subtype_Definition,
               Create_Std_Type_Mark (Time_Subtype_Declaration));
            Constraint := Create_Std_Range_Expr
              (Create_Std_Phys_Lit (0, Time_Fs_Unit),
               Create_Std_Phys_Lit (High_Bound (Flags.Flag_Time_64),
                                    Time_Fs_Unit),
               Time_Type_Definition);
            Set_Range_Constraint (Delay_Length_Subtype_Definition, Constraint);
            Set_Base_Type
              (Delay_Length_Subtype_Definition, Time_Type_Definition);
            Set_Type_Staticness
              (Delay_Length_Subtype_Definition, Time_Staticness);
            Set_Signal_Type_Flag (Delay_Length_Subtype_Definition, True);
            Set_Has_Signal_Flag (Delay_Length_Subtype_Definition,
                                 not Flags.Flag_Whole_Analyze);

            --  subtype delay_length is ...
            Delay_Length_Subtype_Declaration :=
              Create_Std_Decl (Iir_Kind_Subtype_Declaration);
            Set_Std_Identifier (Delay_Length_Subtype_Declaration,
                                Name_Delay_Length);
            Set_Type (Delay_Length_Subtype_Declaration,
                      Delay_Length_Subtype_Definition);
            Set_Type_Declarator (Delay_Length_Subtype_Definition,
                                 Delay_Length_Subtype_Declaration);
            Set_Subtype_Indication (Delay_Length_Subtype_Declaration,
                                    Delay_Length_Subtype_Definition);
            Add_Decl (Delay_Length_Subtype_Declaration);
         else
            Delay_Length_Subtype_Definition := Null_Iir;
            Delay_Length_Subtype_Declaration := Null_Iir;
         end if;
      end;

      --  VHDL87:
      --  function NOW return TIME
      --
      --  impure function NOW return DELAY_LENGTH.
      declare
         Function_Now : Iir_Function_Declaration;
      begin
         Function_Now := Create_Std_Decl (Iir_Kind_Function_Declaration);
         Set_Std_Identifier (Function_Now, Std_Names.Name_Now);
         if Vhdl_Std = Vhdl_87 then
            Set_Return_Type (Function_Now, Time_Subtype_Definition);
         else
            Set_Return_Type (Function_Now, Delay_Length_Subtype_Definition);
         end if;
         if Vhdl_Std = Vhdl_02 then
            Set_Pure_Flag (Function_Now, True);
         else
            Set_Pure_Flag (Function_Now, False);
         end if;
         Set_Implicit_Definition (Function_Now, Iir_Predefined_Now_Function);
         Vhdl.Sem_Utils.Compute_Subprogram_Hash (Function_Now);
         Add_Decl (Function_Now);
      end;

      -- natural subtype
      declare
         Constraint : Iir_Range_Expression;
      begin
         Natural_Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Integer_Subtype_Definition);
         Set_Base_Type (Natural_Subtype_Definition, Integer_Type_Definition);
         Set_Subtype_Type_Mark
           (Natural_Subtype_Definition,
            Create_Std_Type_Mark (Integer_Subtype_Declaration));
         Constraint := Create_Std_Range_Expr
           (Create_Std_Integer (0, Integer_Type_Definition),
            Create_Std_Integer (High_Bound (Flags.Flag_Integer_64),
                                Integer_Type_Definition),
            Integer_Type_Definition);
         Set_Range_Constraint (Natural_Subtype_Definition, Constraint);
         Set_Type_Staticness (Natural_Subtype_Definition, Locally);
         Set_Signal_Type_Flag (Natural_Subtype_Definition, True);
         Set_Has_Signal_Flag (Natural_Subtype_Definition,
                              not Flags.Flag_Whole_Analyze);

         Natural_Subtype_Declaration :=
           Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Std_Identifier (Natural_Subtype_Declaration, Name_Natural);
         Set_Type (Natural_Subtype_Declaration, Natural_Subtype_Definition);
         Set_Subtype_Indication (Natural_Subtype_Declaration,
                                 Natural_Subtype_Definition);
         Add_Decl (Natural_Subtype_Declaration);
         Set_Type_Declarator (Natural_Subtype_Definition,
                              Natural_Subtype_Declaration);
      end;

      -- positive subtype
      declare
         Constraint : Iir_Range_Expression;
      begin
         Positive_Subtype_Definition :=
           Create_Std_Iir (Iir_Kind_Integer_Subtype_Definition);
         Set_Base_Type (Positive_Subtype_Definition,
                        Integer_Type_Definition);
         Set_Subtype_Type_Mark
           (Positive_Subtype_Definition,
            Create_Std_Type_Mark (Integer_Subtype_Declaration));
         Constraint := Create_Std_Range_Expr
           (Create_Std_Integer (1, Integer_Type_Definition),
            Create_Std_Integer (High_Bound (Flags.Flag_Integer_64),
                                Integer_Type_Definition),
             Integer_Type_Definition);
         Set_Range_Constraint (Positive_Subtype_Definition, Constraint);
         Set_Type_Staticness (Positive_Subtype_Definition, Locally);
         Set_Signal_Type_Flag (Positive_Subtype_Definition, True);
         Set_Has_Signal_Flag (Positive_Subtype_Definition,
                              not Flags.Flag_Whole_Analyze);

         Positive_Subtype_Declaration :=
           Create_Std_Decl (Iir_Kind_Subtype_Declaration);
         Set_Std_Identifier (Positive_Subtype_Declaration, Name_Positive);
         Set_Type (Positive_Subtype_Declaration, Positive_Subtype_Definition);
         Set_Subtype_Indication (Positive_Subtype_Declaration,
                                 Positive_Subtype_Definition);
         Add_Decl (Positive_Subtype_Declaration);
         Set_Type_Declarator (Positive_Subtype_Definition,
                              Positive_Subtype_Declaration);
      end;

      -- string type.
      -- type string is array (positive range <>) of character;
      declare
         Element : Iir;
         Index_List : Iir_Flist;
      begin
         Element := Create_Std_Type_Mark (Character_Type_Declaration);

         String_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Array_Type_Definition);
         Set_Base_Type (String_Type_Definition, String_Type_Definition);
         Index_List := Create_Iir_Flist (1);
         Set_Nth_Element (Index_List, 0,
                         Create_Std_Type_Mark (Positive_Subtype_Declaration));
         Set_Index_Subtype_Definition_List (String_Type_Definition,
                                            Index_List);
         Set_Index_Subtype_List (String_Type_Definition, Index_List);
         Set_Element_Subtype_Indication (String_Type_Definition, Element);
         Set_Element_Subtype (String_Type_Definition,
                              Character_Type_Definition);
         Set_Type_Staticness (String_Type_Definition, None);
         Set_Signal_Type_Flag (String_Type_Definition, True);
         Set_Has_Signal_Flag (String_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         Create_Std_Type
           (String_Type_Declaration, String_Type_Definition, Name_String);

         Add_Implicit_Operations (String_Type_Declaration);
      end;

      if Vhdl_Std >= Vhdl_08 then
         --  type Boolean_Vector is array (Natural range <>) of Boolean;
         Create_Array_Type
           (Boolean_Vector_Type_Definition, Boolean_Vector_Type_Declaration,
            Boolean_Type_Declaration, Name_Boolean_Vector);
      end if;

      -- bit_vector type.
      -- type bit_vector is array (natural range <>) of bit;
      Create_Array_Type
        (Bit_Vector_Type_Definition, Bit_Vector_Type_Declaration,
         Bit_Type_Declaration, Name_Bit_Vector);

      --  LRM08 5.3.2.4 Predefined operations on array types
      --  The following operations are implicitly declared in package
      --  STD.STANDARD immediately following the declaration of type
      --  BIT_VECTOR:
      if Vhdl_Std >= Vhdl_08 then
         Create_To_String (Bit_Vector_Type_Definition,
                           Iir_Predefined_Bit_Vector_To_Ostring,
                           Name_To_Ostring);
         Create_To_String (Bit_Vector_Type_Definition,
                           Iir_Predefined_Bit_Vector_To_Hstring,
                           Name_To_Hstring);
      end if;

      --  VHDL 2008
      --  Vector types
      if Vhdl_Std >= Vhdl_08 then
         -- type integer_vector is array (natural range <>) of Integer;
         Create_Array_Type
           (Integer_Vector_Type_Definition, Integer_Vector_Type_Declaration,
            Integer_Subtype_Declaration, Name_Integer_Vector);

         -- type Real_vector is array (natural range <>) of Real;
         Create_Array_Type
           (Real_Vector_Type_Definition, Real_Vector_Type_Declaration,
            Real_Subtype_Declaration, Name_Real_Vector);

         -- type Time_vector is array (natural range <>) of Time;
         Create_Array_Type
           (Time_Vector_Type_Definition, Time_Vector_Type_Declaration,
            Time_Subtype_Declaration, Name_Time_Vector);
      end if;

      --  VHDL93:
      --  type file_open_kind is (read_mode, write_mode, append_mode);
      if Vhdl_Std >= Vhdl_93c then
         File_Open_Kind_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Base_Type (File_Open_Kind_Type_Definition,
                        File_Open_Kind_Type_Definition);
         Set_Enumeration_Literal_List
           (File_Open_Kind_Type_Definition, Create_Iir_Flist (3));

         File_Open_Kind_Read_Mode := Create_Std_Literal
           (Name_Read_Mode, 0, File_Open_Kind_Type_Definition);
         File_Open_Kind_Write_Mode := Create_Std_Literal
           (Name_Write_Mode, 1, File_Open_Kind_Type_Definition);
         File_Open_Kind_Append_Mode := Create_Std_Literal
           (Name_Append_Mode, 2, File_Open_Kind_Type_Definition);
         Set_Type_Staticness (File_Open_Kind_Type_Definition, Locally);
         Set_Signal_Type_Flag (File_Open_Kind_Type_Definition, True);
         Set_Has_Signal_Flag (File_Open_Kind_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         --  type file_open_kind is
         Create_Std_Type
           (File_Open_Kind_Type_Declaration, File_Open_Kind_Type_Definition,
            Name_File_Open_Kind);

         Utils.Create_Range_Constraint_For_Enumeration_Type
           (File_Open_Kind_Type_Definition);
         Add_Implicit_Operations (File_Open_Kind_Type_Declaration);
      else
         File_Open_Kind_Type_Declaration := Null_Iir;
         File_Open_Kind_Type_Definition := Null_Iir;
         File_Open_Kind_Read_Mode := Null_Iir;
         File_Open_Kind_Write_Mode := Null_Iir;
         File_Open_Kind_Append_Mode := Null_Iir;
      end if;

      --  VHDL93:
      --  type file_open_status is
      --      (open_ok, status_error, name_error, mode_error);
      if Vhdl_Std >= Vhdl_93c then
         File_Open_Status_Type_Definition :=
           Create_Std_Iir (Iir_Kind_Enumeration_Type_Definition);
         Set_Base_Type (File_Open_Status_Type_Definition,
                        File_Open_Status_Type_Definition);
         Set_Enumeration_Literal_List
           (File_Open_Status_Type_Definition, Create_Iir_Flist (4));

         File_Open_Status_Open_Ok := Create_Std_Literal
           (Name_Open_Ok, 0, File_Open_Status_Type_Definition);
         File_Open_Status_Status_Error := Create_Std_Literal
           (Name_Status_Error, 1, File_Open_Status_Type_Definition);
         File_Open_Status_Name_Error := Create_Std_Literal
           (Name_Name_Error, 2, File_Open_Status_Type_Definition);
         File_Open_Status_Mode_Error := Create_Std_Literal
           (Name_Mode_Error, 3, File_Open_Status_Type_Definition);
         Set_Type_Staticness (File_Open_Status_Type_Definition, Locally);
         Set_Signal_Type_Flag (File_Open_Status_Type_Definition, True);
         Set_Has_Signal_Flag (File_Open_Status_Type_Definition,
                              not Flags.Flag_Whole_Analyze);

         --  type file_open_kind is
         Create_Std_Type (File_Open_Status_Type_Declaration,
                          File_Open_Status_Type_Definition,
                          Name_File_Open_Status);
         Utils.Create_Range_Constraint_For_Enumeration_Type
           (File_Open_Status_Type_Definition);
         Add_Implicit_Operations (File_Open_Status_Type_Declaration);
      else
         File_Open_Status_Type_Declaration := Null_Iir;
         File_Open_Status_Type_Definition := Null_Iir;
         File_Open_Status_Open_Ok := Null_Iir;
         File_Open_Status_Status_Error := Null_Iir;
         File_Open_Status_Name_Error := Null_Iir;
         File_Open_Status_Mode_Error := Null_Iir;
      end if;

      --  VHDL93:
      --  attribute FOREIGN: string;
      if Vhdl_Std >= Vhdl_93c then
         Foreign_Attribute := Create_Std_Decl (Iir_Kind_Attribute_Declaration);
         Set_Std_Identifier (Foreign_Attribute, Name_Foreign);
         Set_Type_Mark (Foreign_Attribute,
                        Create_Std_Type_Mark (String_Type_Declaration));
         Set_Type (Foreign_Attribute, String_Type_Definition);
         Add_Decl (Foreign_Attribute);
      else
         Foreign_Attribute := Null_Iir;
      end if;

      if Vhdl_Std >= Vhdl_08 then
         Create_To_String (Boolean_Type_Definition,
                           Iir_Predefined_Enum_To_String);
         Create_To_String (Bit_Type_Definition,
                           Iir_Predefined_Enum_To_String);
         Create_To_String (Character_Type_Definition,
                           Iir_Predefined_Enum_To_String);
         Create_To_String (Severity_Level_Type_Definition,
                           Iir_Predefined_Enum_To_String);
         Create_To_String (Universal_Integer_Type_Definition,
                           Iir_Predefined_Integer_To_String);
         Create_To_String (Universal_Real_Type_Definition,
                           Iir_Predefined_Floating_To_String);
         Create_To_String (Integer_Type_Definition,
                           Iir_Predefined_Integer_To_String);
         Create_To_String (Real_Type_Definition,
                           Iir_Predefined_Floating_To_String);
         Create_To_String (Time_Type_Definition,
                           Iir_Predefined_Physical_To_String);
         Create_To_String (File_Open_Kind_Type_Definition,
                           Iir_Predefined_Enum_To_String);
         Create_To_String (File_Open_Status_Type_Definition,
                           Iir_Predefined_Enum_To_String);

         --  Predefined overload TO_STRING operations
         Create_To_String (Real_Type_Definition,
                           Iir_Predefined_Real_To_String_Digits,
                           Name_To_String,
                           Name_Digits,
                           Natural_Subtype_Definition);
         Create_To_String (Real_Type_Definition,
                           Iir_Predefined_Real_To_String_Format,
                           Name_To_String,
                           Name_Format,
                           String_Type_Definition);
         Create_To_String (Time_Type_Definition,
                           Iir_Predefined_Time_To_String_Unit,
                           Name_To_String,
                           Name_Unit,
                           Time_Subtype_Definition);
      end if;

      --  Wilcard types.
      --  Create the declaration and give them meaningful (and invalid) names
      --  so that error messages are clear for the user.
      Wildcard_Type_Declaration_Chain := Null_Iir;
      Create_Wildcard_Type (Wildcard_Any_Type, "any type");
      Create_Wildcard_Type (Wildcard_Any_Aggregate_Type, "any aggregate type");
      Create_Wildcard_Type (Wildcard_Any_String_Type, "any string type");
      Create_Wildcard_Type (Wildcard_Any_Access_Type, "any access type");

      Error_Type := Utils.Create_Error_Type (Wildcard_Any_Type);
      Set_Error_Origin (Error_Type, Null_Iir);
      Create_Wildcard_Type (Error_Type, "unknown type");
   end Create_Std_Standard_Package;

   procedure Set_Time_Resolution (Resolution : Character)
   is
      Unit : Iir;
      Prim : Iir;
      Rng : Iir;
   begin
      case Resolution is
         when 'f' =>
            Prim := Time_Fs_Unit;
         when 'p' =>
            Prim := Time_Ps_Unit;
         when 'n' =>
            Prim := Time_Ns_Unit;
         when 'u' =>
            Prim := Time_Us_Unit;
         when 'm' =>
            Prim := Time_Ms_Unit;
         when 's' =>
            Prim := Time_Sec_Unit;
         when 'M' =>
            Prim := Time_Min_Unit;
         when 'h' =>
            Prim := Time_Hr_Unit;
         when others =>
            raise Internal_Error;
      end case;

      --  Adjust range of TIME subtype.
      Rng := Get_Range_Constraint (Time_Subtype_Definition);
      Set_Physical_Unit (Get_Left_Limit (Rng), Prim);
      Set_Physical_Unit (Get_Right_Limit (Rng), Prim);

      --  Adjust range of DELAY_LENGTH.
      if Vhdl_Std >= Vhdl_93c then
         Rng := Get_Range_Constraint (Delay_Length_Subtype_Definition);
         Set_Physical_Unit (Get_Left_Limit (Rng), Prim);
         Set_Physical_Unit (Get_Right_Limit (Rng), Prim);
      end if;

      Unit := Get_Unit_Chain (Time_Type_Definition);
      while Unit /= Null_Iir loop
         declare
            Lit : constant Iir := Get_Physical_Literal (Unit);
            Orig : constant Iir := Get_Literal_Origin (Lit);
            Lit_Unit : Iir;
         begin
            if Prim = Null_Iir then
               --  Primary already set, just recompute values.
               Lit_Unit := Get_Physical_Literal (Get_Physical_Unit (Orig));
               Set_Value (Lit, Get_Value (Orig) * Get_Value (Lit_Unit));
            elsif Unit = Prim then
               Set_Value (Lit, 1);
               Prim := Null_Iir;
            else
               Set_Value (Lit, 0);
            end if;
         end;
         Unit := Get_Chain (Unit);
      end loop;
   end Set_Time_Resolution;

   function Get_Minimal_Time_Resolution return Character is
   begin
      if Get_Use_Flag (Time_Fs_Unit) then
         return 'f';
      end if;
      if Get_Use_Flag (Time_Ps_Unit) then
         return 'p';
      end if;
      if Get_Use_Flag (Time_Ns_Unit) then
         return 'n';
      end if;
      if Get_Use_Flag (Time_Us_Unit) then
         return 'u';
      end if;
      if Get_Use_Flag (Time_Ms_Unit) then
         return 'm';
      end if;
      if Get_Use_Flag (Time_Sec_Unit) then
         return 's';
      end if;
      if Get_Use_Flag (Time_Min_Unit) then
         return 'M';
      end if;
      if Get_Use_Flag (Time_Hr_Unit) then
         return 'h';
      end if;
      return '?';
   end Get_Minimal_Time_Resolution;
end Vhdl.Std_Package;