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Diffstat (limited to 'src/vhdl/sem_expr.adb')
| -rw-r--r-- | src/vhdl/sem_expr.adb | 4262 |
1 files changed, 4262 insertions, 0 deletions
diff --git a/src/vhdl/sem_expr.adb b/src/vhdl/sem_expr.adb new file mode 100644 index 0000000..f7af76c --- /dev/null +++ b/src/vhdl/sem_expr.adb @@ -0,0 +1,4262 @@ +-- Semantic analysis. +-- 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 Std_Package; use Std_Package; +with Errorout; use Errorout; +with Flags; use Flags; +with Sem_Scopes; use Sem_Scopes; +with Sem_Names; use Sem_Names; +with Sem; +with Name_Table; +with Iirs_Utils; use Iirs_Utils; +with Evaluation; use Evaluation; +with Iir_Chains; use Iir_Chains; +with Sem_Types; +with Sem_Stmts; use Sem_Stmts; +with Sem_Assocs; use Sem_Assocs; +with Xrefs; use Xrefs; + +package body Sem_Expr is + procedure Not_Match (Expr: Iir; A_Type: Iir) + is + pragma Inline (Not_Match); + begin + Error_Not_Match (Expr, A_Type, Expr); + end Not_Match; + +-- procedure Not_Match (Expr: Iir; Type1: Iir; Type2: Iir) is +-- begin +-- Error_Msg_Sem +-- ("can't match '" & Disp_Node (Expr) & "' with type '" +-- & Disp_Node (Type1) & "' or type '" & Disp_Node (Type2) & "'", +-- Expr); +-- end Not_Match; + +-- procedure Overloaded (Expr: Iir) is +-- begin +-- Error_Msg_Sem +-- ("cant resolve overloaded identifier '" & Get_String (Expr) & "'", +-- Expr); +-- end Overloaded; + + -- Replace type of TARGET by A_TYPE. + -- If TARGET has already a type, it must be an overload list, and in this + -- case, this list is freed, or it must be A_TYPE. + -- A_TYPE can't be an overload list. + -- + -- This procedure can be called in the second pass, when the type is known. + procedure Replace_Type (Target: Iir; A_Type: Iir) is + Old_Type: Iir; + begin + Old_Type := Get_Type (Target); + if Old_Type /= Null_Iir then + if Is_Overload_List (Old_Type) then + Free_Iir (Old_Type); + elsif Old_Type = A_Type then + return; + else + -- Cannot replace a type. + raise Internal_Error; + end if; + end if; + if A_Type = Null_Iir then + return; + end if; + if Is_Overload_List (A_Type) then + raise Internal_Error; + end if; + Set_Type (Target, A_Type); + end Replace_Type; + + -- Return true if EXPR is overloaded, ie has several meanings. + function Is_Overloaded (Expr : Iir) return Boolean + is + Expr_Type : constant Iir := Get_Type (Expr); + begin + return Expr_Type = Null_Iir or else Is_Overload_List (Expr_Type); + end Is_Overloaded; + + -- Return the common type of base types LEFT and RIGHT. + -- LEFT are RIGHT must be really base types (not subtypes). + -- Roughly speaking, it returns LEFT (= RIGHT) if LEFT = RIGHT (ie, same + -- type), null otherwise. + -- However, it handles implicite conversions of universal types. + function Get_Common_Basetype (Left: Iir; Right: Iir) + return Iir is + begin + if Left = Right then + return Left; + end if; + case Get_Kind (Left) is + when Iir_Kind_Integer_Type_Definition => + if Right = Convertible_Integer_Type_Definition then + return Left; + elsif Left = Convertible_Integer_Type_Definition + and then Get_Kind (Right) = Iir_Kind_Integer_Type_Definition + then + return Right; + end if; + when Iir_Kind_Floating_Type_Definition => + if Right = Convertible_Real_Type_Definition then + return Left; + elsif Left = Convertible_Real_Type_Definition + and then Get_Kind (Right) = Iir_Kind_Floating_Type_Definition + then + return Right; + end if; + when others => + null; + end case; + return Null_Iir; + end Get_Common_Basetype; + + -- LEFT are RIGHT must be really a type (not a subtype). + function Are_Basetypes_Compatible (Left: Iir; Right: Iir) + return Boolean is + begin + return Get_Common_Basetype (Left, Right) /= Null_Iir; + end Are_Basetypes_Compatible; + + function Are_Types_Compatible (Left: Iir; Right: Iir) + return Boolean is + begin + return Get_Common_Basetype (Get_Base_Type (Left), + Get_Base_Type (Right)) /= Null_Iir; + end Are_Types_Compatible; + + function Are_Nodes_Compatible (Left: Iir; Right: Iir) + return Boolean is + begin + return Are_Types_Compatible (Get_Type (Left), Get_Type (Right)); + end Are_Nodes_Compatible; + + -- Return TRUE iif LEFT_TYPE and RIGHT_TYPES are compatible. RIGHT_TYPES + -- may be an overload list. + function Compatibility_Types1 (Left_Type : Iir; Right_Types : Iir) + return Boolean + is + El : Iir; + Right_List : Iir_List; + begin + pragma Assert (not Is_Overload_List (Left_Type)); + + if Is_Overload_List (Right_Types) then + Right_List := Get_Overload_List (Right_Types); + for I in Natural loop + El := Get_Nth_Element (Right_List, I); + exit when El = Null_Iir; + if Are_Types_Compatible (Left_Type, El) then + return True; + end if; + end loop; + return False; + else + return Are_Types_Compatible (Left_Type, Right_Types); + end if; + end Compatibility_Types1; + + -- Return compatibility for nodes LEFT and RIGHT. + -- LEFT is expected to be an interface of a function definition. + -- Type of RIGHT can be an overload_list + -- RIGHT might be implicitly converted to LEFT. + function Compatibility_Nodes (Left : Iir; Right : Iir) + return Boolean + is + Left_Type, Right_Type : Iir; + begin + Left_Type := Get_Base_Type (Get_Type (Left)); + Right_Type := Get_Type (Right); + + -- Check. + case Get_Kind (Left_Type) is + when Iir_Kind_Floating_Type_Definition + | Iir_Kind_Enumeration_Type_Definition + | Iir_Kind_Integer_Type_Definition + | Iir_Kind_Record_Type_Definition + | Iir_Kind_File_Type_Definition + | Iir_Kind_Physical_Type_Definition + | Iir_Kind_Access_Type_Definition + | Iir_Kind_Array_Type_Definition => + null; + when others => + Error_Kind ("are_node_compatible_ov", Left_Type); + end case; + + return Compatibility_Types1 (Left_Type, Right_Type); + end Compatibility_Nodes; + + -- Return TRUE iff A_TYPE can be the type of string or bit string literal + -- EXPR. EXPR is needed to distinguish between string and bit string + -- for VHDL87 rule about the type of a bit string. + function Is_String_Literal_Type (A_Type : Iir; Expr : Iir) return Boolean + is + Base_Type : constant Iir := Get_Base_Type (A_Type); + El_Bt : Iir; + begin + -- LRM 7.3.1 + -- [...] the type of the literal must be a one-dimensional array ... + if not Is_One_Dimensional_Array_Type (Base_Type) then + return False; + end if; + -- LRM 7.3.1 + -- ... of a character type ... + El_Bt := Get_Base_Type (Get_Element_Subtype (Base_Type)); + if Get_Kind (El_Bt) /= Iir_Kind_Enumeration_Type_Definition then + return False; + end if; + -- LRM87 7.3.1 + -- ... (for string literals) or of type BIT (for bit string literals). + if Flags.Vhdl_Std = Vhdl_87 + and then Get_Kind (Expr) = Iir_Kind_Bit_String_Literal + and then El_Bt /= Bit_Type_Definition + then + return False; + end if; + return True; + end Is_String_Literal_Type; + + -- Return TRUE iff A_TYPE can be the type of an aggregate. + function Is_Aggregate_Type (A_Type : Iir) return Boolean is + begin + -- LRM 7.3.2 Aggregates + -- [...] the type of the aggregate must be a composite type. + case Get_Kind (Get_Base_Type (A_Type)) is + when Iir_Kind_Array_Type_Definition + | Iir_Kind_Record_Type_Definition => + return True; + when others => + return False; + end case; + end Is_Aggregate_Type; + + -- Return TRUE iff A_TYPE can be the type of a null literal. + function Is_Null_Literal_Type (A_Type : Iir) return Boolean is + begin + -- LRM 7.3.1 Literals + -- The literal NULL represents the null access value for any access + -- type. + return + Get_Kind (Get_Base_Type (A_Type)) = Iir_Kind_Access_Type_Definition; + end Is_Null_Literal_Type; + + -- Return TRUE iff A_TYPE can be the type of allocator EXPR. Note that + -- the allocator must have been analyzed. + function Is_Allocator_Type (A_Type : Iir; Expr : Iir) return Boolean + is + Base_Type : constant Iir := Get_Base_Type (A_Type); + Designated_Type : Iir; + begin + -- LRM 7.3.6 Allocators + -- [...] the value returned is of an access type having the named + -- designated type. + + if Get_Kind (Base_Type) /= Iir_Kind_Access_Type_Definition then + return False; + end if; + Designated_Type := Get_Allocator_Designated_Type (Expr); + pragma Assert (Designated_Type /= Null_Iir); + -- Cheat: there is no allocators on universal types. + return Get_Base_Type (Get_Designated_Type (Base_Type)) + = Get_Base_Type (Designated_Type); + end Is_Allocator_Type; + + -- Return TRUE iff the type of EXPR is compatible with A_TYPE + function Is_Expr_Compatible (A_Type : Iir; Expr : Iir) return Boolean + is + Expr_Type : constant Iir := Get_Type (Expr); + begin + if Expr_Type /= Null_Iir then + return Compatibility_Types1 (A_Type, Expr_Type); + end if; + + case Get_Kind (Expr) is + when Iir_Kind_Aggregate => + return Is_Aggregate_Type (A_Type); + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + return Is_String_Literal_Type (A_Type, Expr); + when Iir_Kind_Null_Literal => + return Is_Null_Literal_Type (A_Type); + when Iir_Kind_Allocator_By_Expression + | Iir_Kind_Allocator_By_Subtype => + return Is_Allocator_Type (A_Type, Expr); + when Iir_Kind_Parenthesis_Expression => + return Is_Expr_Compatible (A_Type, Get_Expression (Expr)); + when others => + -- Error while EXPR was typed. FIXME: should create an ERROR + -- node? + return False; + end case; + end Is_Expr_Compatible; + + function Check_Is_Expression (Expr : Iir; Loc : Iir) return Iir + is + begin + if Expr = Null_Iir then + return Null_Iir; + end if; + case Get_Kind (Expr) is + when Iir_Kind_Type_Declaration + | Iir_Kind_Subtype_Declaration + | Iir_Kinds_Subtype_Definition + | Iir_Kind_Design_Unit + | Iir_Kind_Architecture_Body + | Iir_Kind_Configuration_Declaration + | Iir_Kind_Entity_Declaration + | Iir_Kind_Package_Declaration + | Iir_Kind_Package_Instantiation_Declaration + | Iir_Kinds_Concurrent_Statement + | Iir_Kinds_Sequential_Statement + | Iir_Kind_Library_Declaration + | Iir_Kind_Library_Clause + | Iir_Kind_Component_Declaration + | Iir_Kinds_Procedure_Declaration + | Iir_Kind_Range_Array_Attribute + | Iir_Kind_Reverse_Range_Array_Attribute + | Iir_Kind_Element_Declaration + | Iir_Kind_Attribute_Declaration + | Iir_Kind_Psl_Declaration => + Error_Msg_Sem (Disp_Node (Expr) + & " not allowed in an expression", Loc); + return Null_Iir; + when Iir_Kinds_Function_Declaration => + return Expr; + when Iir_Kind_Overload_List => + return Expr; + when Iir_Kinds_Literal + | Iir_Kind_Character_Literal + | Iir_Kind_Simple_Aggregate + | Iir_Kind_Unit_Declaration + | Iir_Kind_Enumeration_Literal => + return Expr; + when Iir_Kinds_Object_Declaration + | Iir_Kind_Aggregate + | Iir_Kind_Allocator_By_Expression + | Iir_Kind_Allocator_By_Subtype + | Iir_Kind_Qualified_Expression => + return Expr; + when Iir_Kinds_Quantity_Declaration => + return Expr; + when Iir_Kinds_Dyadic_Operator + | Iir_Kinds_Monadic_Operator => + return Expr; + when Iir_Kind_Slice_Name + | Iir_Kind_Indexed_Name + | Iir_Kind_Selected_Element + | Iir_Kind_Dereference + | Iir_Kind_Implicit_Dereference + | Iir_Kinds_Expression_Attribute + | Iir_Kind_Attribute_Value + | Iir_Kind_Parenthesis_Expression + | Iir_Kind_Type_Conversion + | Iir_Kind_Function_Call => + return Expr; + when Iir_Kind_Simple_Name + | Iir_Kind_Parenthesis_Name + | Iir_Kind_Attribute_Name + | Iir_Kind_Selected_Name + | Iir_Kind_Selected_By_All_Name => + return Expr; + when Iir_Kind_Error => + return Expr; + when others => + Error_Kind ("check_is_expression", Expr); + --N := Get_Type (Expr); + --return Expr; + end case; + end Check_Is_Expression; + + function Check_Implicit_Conversion (Targ_Type : Iir; Expr : Iir) + return Boolean + is + Expr_Type : Iir; + Targ_Indexes : Iir_List; + Expr_Indexes : Iir_List; + Targ_Index : Iir; + Expr_Index : Iir; + begin + -- Handle errors. + if Targ_Type = Null_Iir or else Expr = Null_Iir then + return True; + end if; + if Get_Kind (Targ_Type) /= Iir_Kind_Array_Subtype_Definition + or else Get_Constraint_State (Targ_Type) /= Fully_Constrained + then + return True; + end if; + Expr_Type := Get_Type (Expr); + if Expr_Type = Null_Iir + or else Get_Kind (Expr_Type) /= Iir_Kind_Array_Subtype_Definition + or else Get_Constraint_State (Expr_Type) /= Fully_Constrained + then + return True; + end if; + Targ_Indexes := Get_Index_Subtype_List (Targ_Type); + Expr_Indexes := Get_Index_Subtype_List (Expr_Type); + for I in Natural loop + Targ_Index := Get_Index_Type (Targ_Indexes, I); + Expr_Index := Get_Index_Type (Expr_Indexes, I); + exit when Targ_Index = Null_Iir and Expr_Index = Null_Iir; + if Targ_Index = Null_Iir or Expr_Index = Null_Iir then + -- Types does not match. + raise Internal_Error; + end if; + if Get_Type_Staticness (Targ_Index) = Locally + and then Get_Type_Staticness (Expr_Index) = Locally + then + if Eval_Discrete_Type_Length (Targ_Index) + /= Eval_Discrete_Type_Length (Expr_Index) + then + return False; + end if; + end if; + end loop; + return True; + end Check_Implicit_Conversion; + + -- Find a type compatible with A_TYPE in TYPE_LIST (which can be an + -- overload list or a simple type) and return it. + -- In case of failure, return null. + function Search_Overloaded_Type (Type_List: Iir; A_Type: Iir) + return Iir + is + Type_List_List : Iir_List; + El: Iir; + Com : Iir; + Res : Iir; + begin + if not Is_Overload_List (Type_List) then + return Get_Common_Basetype (Get_Base_Type (Type_List), + Get_Base_Type (A_Type)); + else + Type_List_List := Get_Overload_List (Type_List); + Res := Null_Iir; + for I in Natural loop + El := Get_Nth_Element (Type_List_List, I); + exit when El = Null_Iir; + Com := Get_Common_Basetype (Get_Base_Type (El), + Get_Base_Type (A_Type)); + if Com /= Null_Iir then + if Res = Null_Iir then + Res := Com; + else + -- Several compatible types. + return Null_Iir; + end if; + end if; + end loop; + return Res; + end if; + end Search_Overloaded_Type; + + -- LIST1, LIST2 are either a type node or an overload list of types. + -- Return THE type which is compatible with LIST1 are LIST2. + -- Return null_iir if there is no such type or if there are several types. + function Search_Compatible_Type (List1, List2 : Iir) return Iir + is + List1_List : Iir_List; + Res : Iir; + El : Iir; + Tmp : Iir; + begin + if Is_Overload_List (List1) then + List1_List := Get_Overload_List (List1); + Res := Null_Iir; + for I in Natural loop + El := Get_Nth_Element (List1_List, I); + exit when El = Null_Iir; + Tmp := Search_Overloaded_Type (List2, El); + if Tmp /= Null_Iir then + if Res = Null_Iir then + Res := Tmp; + else + -- Several types match. + return Null_Iir; + end if; + end if; + end loop; + return Res; + else + return Search_Overloaded_Type (List2, List1); + end if; + end Search_Compatible_Type; + + -- Semantize the range expression EXPR. + -- If A_TYPE is not null_iir, EXPR is expected to be of type A_TYPE. + -- LRM93 3.2.1.1 + -- FIXME: avoid to run it on an already semantized node, be careful + -- with range_type_expr. + function Sem_Simple_Range_Expression + (Expr: Iir_Range_Expression; A_Type: Iir; Any_Dir : Boolean) + return Iir_Range_Expression + is + Base_Type: Iir; + Left, Right: Iir; + Left_Type, Right_Type : Iir; + Expr_Type : Iir; + begin + Expr_Type := Get_Type (Expr); + Left := Get_Left_Limit (Expr); + Right := Get_Right_Limit (Expr); + + if Expr_Type = Null_Iir then + -- Pass 1. + + if A_Type = Null_Iir then + Base_Type := Null_Iir; + else + Base_Type := Get_Base_Type (A_Type); + end if; + + -- Analyze left and right bounds. + Right := Sem_Expression_Ov (Right, Base_Type); + Left := Sem_Expression_Ov (Left, Base_Type); + + if Left = Null_Iir or else Right = Null_Iir then + -- Error. + return Null_Iir; + end if; + + Left_Type := Get_Type (Left); + Right_Type := Get_Type (Right); + -- Check for string or aggregate literals + -- FIXME: improve error message + if Left_Type = Null_Iir then + Error_Msg_Sem ("bad expression for a scalar", Left); + return Null_Iir; + end if; + if Right_Type = Null_Iir then + Error_Msg_Sem ("bad expression for a scalar", Right); + return Null_Iir; + end if; + + if Is_Overload_List (Left_Type) + or else Is_Overload_List (Right_Type) + then + if Base_Type /= Null_Iir then + -- Cannot happen, since sem_expression_ov should resolve + -- ambiguties if a type is given. + raise Internal_Error; + end if; + + -- Try to find a common type. + Expr_Type := Search_Compatible_Type (Left_Type, Right_Type); + if Expr_Type = Null_Iir then + if Compatibility_Types1 (Universal_Integer_Type_Definition, + Left_Type) + and then + Compatibility_Types1 (Universal_Integer_Type_Definition, + Right_Type) + then + Expr_Type := Universal_Integer_Type_Definition; + elsif Compatibility_Types1 (Universal_Real_Type_Definition, + Left_Type) + and then + Compatibility_Types1 (Universal_Real_Type_Definition, + Right_Type) + then + Expr_Type := Universal_Real_Type_Definition; + else + -- FIXME: handle overload + Error_Msg_Sem + ("left and right expressions of range are not compatible", + Expr); + return Null_Iir; + end if; + end if; + Left := Sem_Expression (Left, Expr_Type); + Right := Sem_Expression (Right, Expr_Type); + if Left = Null_Iir or else Right = Null_Iir then + return Null_Iir; + end if; + else + Expr_Type := Get_Common_Basetype (Get_Base_Type (Left_Type), + Get_Base_Type (Right_Type)); + if Expr_Type = Null_Iir then + Error_Msg_Sem + ("left and right expressions of range are not compatible", + Expr); + return Null_Iir; + end if; + end if; + + -- The type of the range is known, finish analysis. + else + -- Second call. + + pragma Assert (A_Type /= Null_Iir); + + if Is_Overload_List (Expr_Type) then + -- FIXME: resolve overload + raise Internal_Error; + else + if not Are_Types_Compatible (Expr_Type, A_Type) then + Error_Msg_Sem + ("type of range doesn't match expected type", Expr); + return Null_Iir; + end if; + + return Expr; + end if; + end if; + + Left := Eval_Expr_If_Static (Left); + Right := Eval_Expr_If_Static (Right); + Set_Left_Limit (Expr, Left); + Set_Right_Limit (Expr, Right); + Set_Expr_Staticness (Expr, Min (Get_Expr_Staticness (Left), + Get_Expr_Staticness (Right))); + + if A_Type /= Null_Iir + and then not Are_Types_Compatible (Expr_Type, A_Type) + then + Error_Msg_Sem ("type of range doesn't match expected type", Expr); + return Null_Iir; + end if; + + Set_Type (Expr, Expr_Type); + if Get_Kind (Get_Base_Type (Expr_Type)) + not in Iir_Kinds_Scalar_Type_Definition + then + Error_Msg_Sem ("type of range is not a scalar type", Expr); + return Null_Iir; + end if; + + if Get_Expr_Staticness (Expr) = Locally + and then Get_Type_Staticness (Expr_Type) = Locally + and then Get_Kind (Expr_Type) in Iir_Kinds_Subtype_Definition + then + Eval_Check_Range (Expr, Expr_Type, Any_Dir); + end if; + + return Expr; + end Sem_Simple_Range_Expression; + + -- The result can be: + -- a subtype definition + -- a range attribute + -- a range type definition + -- LRM93 3.2.1.1 + -- FIXME: avoid to run it on an already semantized node, be careful + -- with range_type_expr. + function Sem_Range_Expression (Expr: Iir; A_Type: Iir; Any_Dir : Boolean) + return Iir + is + Res : Iir; + Res_Type : Iir; + begin + case Get_Kind (Expr) is + when Iir_Kind_Range_Expression => + Res := Sem_Simple_Range_Expression (Expr, A_Type, Any_Dir); + if Res = Null_Iir then + return Null_Iir; + end if; + Res_Type := Get_Type (Res); + + when Iir_Kinds_Denoting_Name + | Iir_Kind_Attribute_Name + | Iir_Kind_Parenthesis_Name => + if Get_Named_Entity (Expr) = Null_Iir then + Sem_Name (Expr); + end if; + Res := Name_To_Range (Expr); + if Res = Error_Mark then + return Null_Iir; + end if; + + case Get_Kind (Res) is + when Iir_Kind_Simple_Name + | Iir_Kind_Selected_Name => + pragma Assert (Get_Kind (Get_Named_Entity (Res)) + in Iir_Kinds_Type_Declaration); + Res_Type := Get_Type (Get_Named_Entity (Res)); + when Iir_Kind_Range_Array_Attribute + | Iir_Kind_Reverse_Range_Array_Attribute => + Res_Type := Get_Type (Res); + when others => + Error_Msg_Sem ("name must denote a range", Expr); + return Null_Iir; + end case; + if A_Type /= Null_Iir + and then Get_Base_Type (Res_Type) /= Get_Base_Type (A_Type) + then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + + when others => + Error_Msg_Sem ("range expression required", Expr); + return Null_Iir; + end case; + + if Get_Kind (Res_Type) not in Iir_Kinds_Scalar_Type_Definition then + Error_Msg_Sem (Disp_Node (Res) & " is not a range type", Expr); + return Null_Iir; + end if; + + Res := Eval_Range_If_Static (Res); + + if A_Type /= Null_Iir + and then Get_Type_Staticness (A_Type) = Locally + and then Get_Kind (A_Type) in Iir_Kinds_Subtype_Definition + then + if Get_Expr_Staticness (Res) = Locally then + Eval_Check_Range (Res, A_Type, Any_Dir); + end if; + end if; + return Res; + end Sem_Range_Expression; + + function Sem_Discrete_Range_Expression + (Expr: Iir; A_Type: Iir; Any_Dir : Boolean) + return Iir + is + Res : Iir; + Res_Type : Iir; + begin + if Get_Kind (Expr) = Iir_Kind_Subtype_Definition then + Res := Sem_Types.Sem_Subtype_Indication (Expr); + if Res = Null_Iir then + return Null_Iir; + end if; + + Res_Type := Res; + if A_Type /= Null_Iir + and then (not Are_Types_Compatible + (A_Type, Get_Type_Of_Subtype_Indication (Res))) + then + -- A_TYPE is known when analyzing an index_constraint within + -- a subtype indication. + Error_Msg_Sem ("subtype " & Disp_Node (Res) + & " doesn't match expected type " + & Disp_Node (A_Type), Expr); + -- FIXME: override type of RES ? + end if; + else + Res := Sem_Range_Expression (Expr, A_Type, Any_Dir); + + if Res = Null_Iir then + return Null_Iir; + end if; + + Res_Type := Get_Type (Res); + end if; + + -- Check the type is discrete. + if Get_Kind (Res_Type) not in Iir_Kinds_Discrete_Type_Definition then + if Get_Kind (Res_Type) /= Iir_Kind_Error then + -- FIXME: avoid that test with error. + if Get_Kind (Res) not in Iir_Kinds_Denoting_Name then + Error_Msg_Sem ("range is not discrete", Res); + else + Error_Msg_Sem + (Disp_Node (Res) & " is not a discrete range type", Expr); + end if; + end if; + return Null_Iir; + end if; + + return Res; + end Sem_Discrete_Range_Expression; + + function Sem_Discrete_Range_Integer (Expr: Iir) return Iir + is + Res : Iir; + Range_Type : Iir; + begin + Res := Sem_Discrete_Range_Expression (Expr, Null_Iir, True); + if Res = Null_Iir then + return Null_Iir; + end if; + if Get_Kind (Expr) /= Iir_Kind_Range_Expression then + return Res; + end if; + + Range_Type := Get_Type (Res); + if Range_Type = Convertible_Integer_Type_Definition then + -- LRM 3.2.1.1 Index constraints and discrete ranges + -- For a discrete range used in a constrained array + -- definition and defined by a range, an implicit + -- conversion to the predefined type INTEGER is assumed + -- if each bound is either a numeric literal or an + -- attribute, and the type of both bounds (prior to the + -- implicit conversion) is the type universal_integer. + + -- FIXME: catch phys/phys. + Set_Type (Res, Integer_Type_Definition); + if Get_Expr_Staticness (Res) = Locally then + Eval_Check_Range (Res, Integer_Subtype_Definition, True); + end if; + elsif Range_Type = Universal_Integer_Type_Definition then + if Vhdl_Std >= Vhdl_08 then + -- LRM08 5.3.2.2 + -- For a discrete range used in a constrained array definition + -- and defined by a range, an implicit conversion to the + -- predefined type INTEGER is assumed if the type of both bounds + -- (prior the implicit conversion) is the type universal_integer. + null; + elsif Vhdl_Std = Vhdl_93c then + -- GHDL: this is not allowed, however often used: + -- eg: for i in 0 to v'length + 1 loop + -- eg: for i in -1 to 1 loop + + -- Be tolerant. + Warning_Msg_Sem ("universal integer bound must be numeric literal " + & "or attribute", Res); + else + Error_Msg_Sem ("universal integer bound must be numeric literal " + & "or attribute", Res); + end if; + Set_Type (Res, Integer_Type_Definition); + end if; + return Res; + end Sem_Discrete_Range_Integer; + + procedure Set_Function_Call_Staticness (Expr : Iir; Imp : Iir) + is + Staticness : Iir_Staticness; + begin + -- LRM93 7.4.1 (Locally Static Primaries) + -- 4. a function call whose function name denotes an implicitly + -- defined operator, and whose actual parameters are each + -- locally static expressions; + -- + -- LRM93 7.4.2 (Globally Static Primaries) + -- 9. a function call whose function name denotes a pure function, + -- and whose actual parameters are each globally static + -- expressions. + case Get_Kind (Expr) is + when Iir_Kinds_Monadic_Operator => + Staticness := Get_Expr_Staticness (Get_Operand (Expr)); + when Iir_Kinds_Dyadic_Operator => + Staticness := Min (Get_Expr_Staticness (Get_Left (Expr)), + Get_Expr_Staticness (Get_Right (Expr))); + when Iir_Kind_Function_Call => + Staticness := Locally; + declare + Assoc : Iir; + begin + Assoc := Get_Parameter_Association_Chain (Expr); + while Assoc /= Null_Iir loop + if Get_Kind (Assoc) /= Iir_Kind_Association_Element_Open then + Staticness := Min + (Get_Expr_Staticness (Get_Actual (Assoc)), + Staticness); + end if; + Assoc := Get_Chain (Assoc); + end loop; + end; + when Iir_Kind_Procedure_Call => + return; + when others => + Error_Kind ("set_function_call_staticness (1)", Expr); + end case; + case Get_Kind (Imp) is + when Iir_Kind_Implicit_Function_Declaration => + if Get_Implicit_Definition (Imp) + not in Iir_Predefined_Pure_Functions + then + -- Predefined functions such as Now, Endfile are not static. + Staticness := None; + end if; + when Iir_Kind_Function_Declaration => + if Get_Pure_Flag (Imp) then + Staticness := Min (Staticness, Globally); + else + Staticness := None; + end if; + when others => + Error_Kind ("set_function_call_staticness (2)", Imp); + end case; + Set_Expr_Staticness (Expr, Staticness); + end Set_Function_Call_Staticness; + + -- Add CALLEE in the callees list of SUBPRG (which must be a subprg decl). + procedure Add_In_Callees_List (Subprg : Iir; Callee : Iir) + is + Holder : constant Iir := Get_Callees_List_Holder (Subprg); + List : Iir_List; + begin + List := Get_Callees_List (Holder); + if List = Null_Iir_List then + List := Create_Iir_List; + Set_Callees_List (Holder, List); + end if; + -- FIXME: May use a flag in IMP to speed up the + -- add operation. + Add_Element (List, Callee); + end Add_In_Callees_List; + + -- Check purity rules when SUBPRG calls CALLEE. + -- Both SUBPRG and CALLEE are subprogram declarations. + -- Update purity_state/impure_depth of SUBPRG if it is a procedure. + procedure Sem_Call_Purity_Check (Subprg : Iir; Callee : Iir; Loc : Iir) + is + begin + if Callee = Subprg then + return; + end if; + + -- Handle easy cases. + case Get_Kind (Subprg) is + when Iir_Kind_Function_Declaration => + if not Get_Pure_Flag (Subprg) then + return; + end if; + when Iir_Kind_Procedure_Declaration => + if Get_Purity_State (Subprg) = Impure then + return; + end if; + when Iir_Kinds_Process_Statement => + return; + when others => + Error_Kind ("sem_call_purity_check(0)", Subprg); + end case; + + case Get_Kind (Callee) is + when Iir_Kind_Function_Declaration => + if Get_Pure_Flag (Callee) then + -- Pure functions may be called anywhere. + return; + end if; + -- CALLEE is impure. + case Get_Kind (Subprg) is + when Iir_Kind_Function_Declaration => + Error_Pure (Subprg, Callee, Loc); + when Iir_Kind_Procedure_Declaration => + Set_Purity_State (Subprg, Impure); + when others => + Error_Kind ("sem_call_purity_check(1)", Subprg); + end case; + when Iir_Kind_Procedure_Declaration => + declare + Depth : Iir_Int32; + Callee_Body : Iir; + Subprg_Body : Iir; + begin + Callee_Body := Get_Subprogram_Body (Callee); + Subprg_Body := Get_Subprogram_Body (Subprg); + -- Get purity depth of callee, if possible. + case Get_Purity_State (Callee) is + when Pure => + return; + when Impure => + Depth := Iir_Depth_Impure; + when Maybe_Impure => + if Callee_Body = Null_Iir then + -- Cannot be 'maybe_impure' if no body! + raise Internal_Error; + end if; + Depth := Get_Impure_Depth (Callee_Body); + when Unknown => + -- Add in list. + Add_In_Callees_List (Subprg, Callee); + + if Callee_Body /= Null_Iir then + Depth := Get_Impure_Depth (Callee_Body); + else + return; + end if; + end case; + case Get_Kind (Subprg) is + when Iir_Kind_Function_Declaration => + if Depth = Iir_Depth_Impure then + Error_Pure (Subprg, Callee, Loc); + else + if Depth < Get_Subprogram_Depth (Subprg) then + Error_Pure (Subprg, Callee, Loc); + end if; + end if; + when Iir_Kind_Procedure_Declaration => + if Depth = Iir_Depth_Impure then + Set_Purity_State (Subprg, Impure); + -- FIXME: free callee list ? (wait state). + else + -- Set depth to the worst. + if Depth < Get_Impure_Depth (Subprg_Body) then + Set_Impure_Depth (Subprg_Body, Depth); + end if; + end if; + when others => + Error_Kind ("sem_call_purity_check(2)", Subprg); + end case; + end; + when others => + Error_Kind ("sem_call_purity_check", Callee); + end case; + end Sem_Call_Purity_Check; + + procedure Sem_Call_Wait_Check (Subprg : Iir; Callee : Iir; Loc : Iir) + is + procedure Error_Wait is + begin + Error_Msg_Sem + (Disp_Node (Subprg) & " must not contain wait statement, but calls", + Loc); + Error_Msg_Sem + (Disp_Node (Callee) & " which has (indirectly) a wait statement", + Callee); + --Error_Msg_Sem + -- ("(indirect) wait statement not allowed in " & Where, Loc); + end Error_Wait; + begin + pragma Assert (Get_Kind (Callee) = Iir_Kind_Procedure_Declaration); + + case Get_Wait_State (Callee) is + when False => + return; + when True => + null; + when Unknown => + Add_In_Callees_List (Subprg, Callee); + return; + end case; + + -- LRM 8.1 + -- It is an error if a wait statement appears [...] in a procedure that + -- has a parent that is a function subprogram. + -- + -- Furthermore, it is an error if a wait statement appears [...] in a + -- procedure that has a parent that is such a process statement. + case Get_Kind (Subprg) is + when Iir_Kind_Sensitized_Process_Statement => + Error_Wait; + return; + when Iir_Kind_Process_Statement => + return; + when Iir_Kind_Function_Declaration => + Error_Wait; + return; + when Iir_Kind_Procedure_Declaration => + if Is_Subprogram_Method (Subprg) then + Error_Wait; + else + Set_Wait_State (Subprg, True); + end if; + when others => + Error_Kind ("sem_call_wait_check", Subprg); + end case; + end Sem_Call_Wait_Check; + + procedure Sem_Call_All_Sensitized_Check + (Subprg : Iir; Callee : Iir; Loc : Iir) + is + begin + -- No need to deal with 'process (all)' if standard predates it. + if Vhdl_Std < Vhdl_08 then + return; + end if; + + -- If subprogram called is pure, then there is no signals reference. + case Get_Kind (Callee) is + when Iir_Kind_Function_Declaration => + if Get_Pure_Flag (Callee) then + return; + end if; + when Iir_Kind_Procedure_Declaration => + if Get_Purity_State (Callee) = Pure then + return; + end if; + when others => + Error_Kind ("sem_call_all_sensitized_check", Callee); + end case; + + case Get_All_Sensitized_State (Callee) is + when Invalid_Signal => + case Get_Kind (Subprg) is + when Iir_Kind_Sensitized_Process_Statement => + if Get_Sensitivity_List (Subprg) = Iir_List_All then + -- LRM08 11.3 + -- + -- It is an error if a process statement with the + -- reserved word ALL as its process sensitivity list + -- is the parent of a subprogram declared in a design + -- unit other than that containing the process statement + -- and the subprogram reads an explicitly declared + -- signal that is not a formal signal parameter or + -- member of a formal signal parameter of the + -- subprogram or of any of its parents. Similarly, + -- it is an error if such subprogram reads an implicit + -- signal whose explicit ancestor is not a formal signal + -- parameter or member of a formal parameter of + -- the subprogram or of any of its parents. + Error_Msg_Sem + ("all-sensitized " & Disp_Node (Subprg) + & " can't call " & Disp_Node (Callee), Loc); + Error_Msg_Sem + (" (as this subprogram reads (indirectly) a signal)", + Loc); + end if; + when Iir_Kind_Process_Statement => + return; + when Iir_Kind_Function_Declaration + | Iir_Kind_Procedure_Declaration => + Set_All_Sensitized_State (Subprg, Invalid_Signal); + when others => + Error_Kind ("sem_call_all_sensitized_check", Subprg); + end case; + when Read_Signal => + -- Put this subprogram in callees list as it may read a signal. + -- Used by canon to build the sensitivity list. + Add_In_Callees_List (Subprg, Callee); + if Get_Kind (Subprg) in Iir_Kinds_Subprogram_Declaration then + if Get_All_Sensitized_State (Subprg) < Read_Signal then + Set_All_Sensitized_State (Subprg, Read_Signal); + end if; + end if; + when Unknown => + -- Put this subprogram in callees list as it may read a signal. + -- Used by canon to build the sensitivity list. + Add_In_Callees_List (Subprg, Callee); + when No_Signal => + null; + end case; + end Sem_Call_All_Sensitized_Check; + + -- Set IMP as the implementation to being called by EXPR. + -- If the context is a subprogram or a process (ie, if current_subprogram + -- is not NULL), then mark IMP as callee of current_subprogram, and + -- update states. + procedure Sem_Subprogram_Call_Finish (Expr : Iir; Imp : Iir) + is + Subprg : constant Iir := Get_Current_Subprogram; + begin + Set_Function_Call_Staticness (Expr, Imp); + Mark_Subprogram_Used (Imp); + + -- Check purity/wait/passive. + + if Subprg = Null_Iir then + -- Not inside a suprogram or a process. + return; + end if; + if Subprg = Imp then + -- Recursive call. + return; + end if; + + case Get_Kind (Imp) is + when Iir_Kind_Implicit_Procedure_Declaration + | Iir_Kind_Implicit_Function_Declaration => + if Get_Implicit_Definition (Imp) in Iir_Predefined_Pure_Functions + then + return; + end if; + when Iir_Kind_Function_Declaration => + Sem_Call_Purity_Check (Subprg, Imp, Expr); + Sem_Call_All_Sensitized_Check (Subprg, Imp, Expr); + when Iir_Kind_Procedure_Declaration => + Sem_Call_Purity_Check (Subprg, Imp, Expr); + Sem_Call_Wait_Check (Subprg, Imp, Expr); + Sem_Call_All_Sensitized_Check (Subprg, Imp, Expr); + -- Check passive. + if Get_Passive_Flag (Imp) = False then + case Get_Kind (Subprg) is + when Iir_Kinds_Process_Statement => + if Get_Passive_Flag (Subprg) then + Error_Msg_Sem + (Disp_Node (Subprg) + & " is passive, but calls non-passive " + & Disp_Node (Imp), Expr); + end if; + when others => + null; + end case; + end if; + when others => + raise Internal_Error; + end case; + end Sem_Subprogram_Call_Finish; + + -- EXPR is a function or procedure call. + function Sem_Subprogram_Call_Stage1 + (Expr : Iir; A_Type : Iir; Is_Func_Call : Boolean) + return Iir + is + Imp : Iir; + Nbr_Inter: Natural; + A_Func: Iir; + Imp_List: Iir_List; + Assoc_Chain: Iir; + Inter_Chain : Iir; + Res_Type: Iir_List; + Inter: Iir; + Match : Boolean; + begin + -- Sem_Name has gathered all the possible names for the prefix of this + -- call. Reduce this list to only names that match the types. + Nbr_Inter := 0; + Imp := Get_Implementation (Expr); + Imp_List := Get_Overload_List (Imp); + Assoc_Chain := Get_Parameter_Association_Chain (Expr); + + for I in Natural loop + A_Func := Get_Nth_Element (Imp_List, I); + exit when A_Func = Null_Iir; + + case Get_Kind (A_Func) is + when Iir_Kinds_Functions_And_Literals => + if not Is_Func_Call then + -- The identifier of a function call must be a function or + -- an enumeration literal. + goto Continue; + end if; + when Iir_Kinds_Procedure_Declaration => + if Is_Func_Call then + -- The identifier of a procedure call must be a procedure. + goto Continue; + end if; + when others => + Error_Kind ("sem_subprogram_call_stage1", A_Func); + end case; + + -- Keep this interpretation only if compatible. + if A_Type = Null_Iir + or else Compatibility_Nodes (A_Type, Get_Return_Type (A_Func)) + then + Sem_Association_Chain + (Get_Interface_Declaration_Chain (A_Func), + Assoc_Chain, False, Missing_Parameter, Expr, Match); + if Match then + Replace_Nth_Element (Imp_List, Nbr_Inter, A_Func); + Nbr_Inter := Nbr_Inter + 1; + end if; + end if; + + << Continue >> null; + end loop; + Set_Nbr_Elements (Imp_List, Nbr_Inter); + + -- Set_Implementation (Expr, Inter_List); + -- A set of possible functions to call is in INTER_LIST. + -- Create a set of possible return type in RES_TYPE. + case Nbr_Inter is + when 0 => + -- FIXME: display subprogram name. + Error_Msg_Sem + ("cannot resolve overloading for subprogram call", Expr); + return Null_Iir; + + when 1 => + -- Simple case: no overloading. + Inter := Get_First_Element (Imp_List); + Free_Overload_List (Imp); + Set_Implementation (Expr, Inter); + if Is_Func_Call then + Set_Type (Expr, Get_Return_Type (Inter)); + end if; + Inter_Chain := Get_Interface_Declaration_Chain (Inter); + Sem_Association_Chain + (Inter_Chain, Assoc_Chain, + True, Missing_Parameter, Expr, Match); + Set_Parameter_Association_Chain (Expr, Assoc_Chain); + if not Match then + raise Internal_Error; + end if; + Check_Subprogram_Associations (Inter_Chain, Assoc_Chain); + Sem_Subprogram_Call_Finish (Expr, Inter); + return Expr; + + when others => + if Is_Func_Call then + if A_Type /= Null_Iir then + -- Cannot find a single interpretation for a given + -- type. + Error_Overload (Expr); + Disp_Overload_List (Imp_List, Expr); + return Null_Iir; + end if; + + -- Create the list of types for the result. + Res_Type := Create_Iir_List; + for I in 0 .. Nbr_Inter - 1 loop + Add_Element + (Res_Type, + Get_Return_Type (Get_Nth_Element (Imp_List, I))); + end loop; + + if Get_Nbr_Elements (Res_Type) = 1 then + -- several implementations but one profile. + Error_Overload (Expr); + Disp_Overload_List (Imp_List, Expr); + return Null_Iir; + end if; + Set_Type (Expr, Create_Overload_List (Res_Type)); + else + -- For a procedure call, the context does't help to resolve + -- overload. + Error_Overload (Expr); + Disp_Overload_List (Imp_List, Expr); + end if; + return Expr; + end case; + end Sem_Subprogram_Call_Stage1; + + -- For a procedure call, A_TYPE must be null. + -- Associations must have already been semantized by sem_association_list. + function Sem_Subprogram_Call (Expr: Iir; A_Type: Iir) return Iir + is + Is_Func: constant Boolean := Get_Kind (Expr) = Iir_Kind_Function_Call; + Res_Type: Iir; + Res: Iir; + Inter_List: Iir; + Param_Chain : Iir; + Inter: Iir; + Assoc_Chain : Iir; + Match : Boolean; + begin + if Is_Func then + Res_Type := Get_Type (Expr); + end if; + + if not Is_Func or else Res_Type = Null_Iir then + -- First call to sem_subprogram_call. + -- Create the list of possible implementations and possible + -- return types, according to arguments and A_TYPE. + + -- Select possible interpretations among all interpretations. + -- NOTE: the list of possible implementations was already created + -- during the transformation of iir_kind_parenthesis_name to + -- iir_kind_function_call. + Inter_List := Get_Implementation (Expr); + if Get_Kind (Inter_List) = Iir_Kind_Error then + return Null_Iir; + elsif Is_Overload_List (Inter_List) then + -- Subprogram name is overloaded. + return Sem_Subprogram_Call_Stage1 (Expr, A_Type, Is_Func); + else + -- Only one interpretation for the subprogram name. + if Is_Func then + if Get_Kind (Inter_List) not in Iir_Kinds_Function_Declaration + then + Error_Msg_Sem ("name does not designate a function", Expr); + return Null_Iir; + end if; + else + if Get_Kind (Inter_List) not in Iir_Kinds_Procedure_Declaration + then + Error_Msg_Sem ("name does not designate a procedure", Expr); + return Null_Iir; + end if; + end if; + + Assoc_Chain := Get_Parameter_Association_Chain (Expr); + Param_Chain := Get_Interface_Declaration_Chain (Inter_List); + Sem_Association_Chain + (Param_Chain, Assoc_Chain, + True, Missing_Parameter, Expr, Match); + Set_Parameter_Association_Chain (Expr, Assoc_Chain); + if not Match then + -- No need to disp an error message, this is done by + -- sem_subprogram_arguments. + return Null_Iir; + end if; + if Is_Func then + Set_Type (Expr, Get_Return_Type (Inter_List)); + end if; + Check_Subprogram_Associations (Param_Chain, Assoc_Chain); + Set_Implementation (Expr, Inter_List); + Sem_Subprogram_Call_Finish (Expr, Inter_List); + return Expr; + end if; + end if; + + -- Second call to Sem_Function_Call (only for functions). + pragma Assert (Is_Func); + pragma Assert (A_Type /= Null_Iir); + + -- The implementation list was set. + -- The return type was set. + -- A_TYPE is not null, A_TYPE is *the* return type. + + Inter_List := Get_Implementation (Expr); + + -- Find a single implementation. + Res := Null_Iir; + if Is_Overload_List (Inter_List) then + -- INTER_LIST is a list of possible declaration to call. + -- Find one, based on the return type A_TYPE. + for I in Natural loop + Inter := Get_Nth_Element (Get_Overload_List (Inter_List), I); + exit when Inter = Null_Iir; + if Are_Basetypes_Compatible + (A_Type, Get_Base_Type (Get_Return_Type (Inter))) + then + if Res /= Null_Iir then + Error_Overload (Expr); + Disp_Overload_List (Get_Overload_List (Inter_List), Expr); + return Null_Iir; + else + Res := Inter; + end if; + end if; + end loop; + else + if Are_Basetypes_Compatible + (A_Type, Get_Base_Type (Get_Return_Type (Inter_List))) + then + Res := Inter_List; + end if; + end if; + if Res = Null_Iir then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + + -- Clean up. + if Res_Type /= Null_Iir and then Is_Overload_List (Res_Type) then + Free_Iir (Res_Type); + end if; + + if Is_Overload_List (Inter_List) then + Free_Iir (Inter_List); + end if; + + -- Simple case: this is not a call to a function, but an enumeration + -- literal. + if Get_Kind (Res) = Iir_Kind_Enumeration_Literal then + -- Free_Iir (Expr); + return Res; + end if; + + -- Set types. + Set_Type (Expr, Get_Return_Type (Res)); + Assoc_Chain := Get_Parameter_Association_Chain (Expr); + Param_Chain := Get_Interface_Declaration_Chain (Res); + Sem_Association_Chain + (Param_Chain, Assoc_Chain, True, Missing_Parameter, Expr, Match); + Set_Parameter_Association_Chain (Expr, Assoc_Chain); + if not Match then + return Null_Iir; + end if; + Check_Subprogram_Associations (Param_Chain, Assoc_Chain); + Set_Implementation (Expr, Res); + Sem_Subprogram_Call_Finish (Expr, Res); + return Expr; + end Sem_Subprogram_Call; + + procedure Sem_Procedure_Call (Call : Iir_Procedure_Call; Stmt : Iir) + is + Imp: Iir; + Name : Iir; + Parameters_Chain : Iir; + Param : Iir; + Formal : Iir; + Prefix : Iir; + Inter : Iir; + begin + Name := Get_Prefix (Call); + -- FIXME: check for denoting name. + Sem_Name (Name); + + -- Return now if the procedure declaration wasn't found. + Imp := Get_Named_Entity (Name); + if Is_Error (Imp) then + return; + end if; + Set_Implementation (Call, Imp); + + Name_To_Method_Object (Call, Name); + Parameters_Chain := Get_Parameter_Association_Chain (Call); + if Sem_Actual_Of_Association_Chain (Parameters_Chain) = False then + return; + end if; + if Sem_Subprogram_Call (Call, Null_Iir) /= Call then + return; + end if; + Imp := Get_Implementation (Call); + if Is_Overload_List (Imp) then + -- Failed to resolve overload. + return; + end if; + Set_Named_Entity (Name, Imp); + Set_Prefix (Call, Finish_Sem_Name (Name)); + + -- LRM 2.1.1.2 Signal Parameters + -- A process statement contains a driver for each actual signal + -- associated with a formal signal parameter of mode OUT or INOUT in + -- a subprogram call. + -- Similarly, a subprogram contains a driver for each formal signal + -- parameter of mode OUT or INOUT declared in its subrogram + -- specification. + Param := Parameters_Chain; + Inter := Get_Interface_Declaration_Chain (Imp); + while Param /= Null_Iir loop + Formal := Get_Formal (Param); + if Formal = Null_Iir then + Formal := Inter; + Inter := Get_Chain (Inter); + else + Formal := Get_Base_Name (Formal); + Inter := Null_Iir; + end if; + if Get_Kind (Formal) = Iir_Kind_Interface_Signal_Declaration + and then Get_Mode (Formal) in Iir_Out_Modes + then + Prefix := Name_To_Object (Get_Actual (Param)); + if Prefix /= Null_Iir then + case Get_Kind (Get_Object_Prefix (Prefix)) is + when Iir_Kind_Signal_Declaration + | Iir_Kind_Interface_Signal_Declaration => + Prefix := Get_Longuest_Static_Prefix (Prefix); + Sem_Stmts.Sem_Add_Driver (Prefix, Stmt); + when others => + null; + end case; + end if; + end if; + Param := Get_Chain (Param); + end loop; + end Sem_Procedure_Call; + + -- List must be an overload list containing subprograms declarations. + -- Try to resolve overload and return the uniq interpretation if one, + -- NULL_IIR otherwise. + -- + -- If there are two functions, one primitive of a universal + -- type and the other not, return the primitive of the universal type. + -- This rule is *not* from LRM (but from Ada) and allows to resolve + -- common cases such as: + -- constant c1 : integer := - 4; -- or '+', 'abs' + -- constant c2 : integer := 2 ** 3; + -- constant c3 : integer := 3 - 2; -- or '+', '*', '/'... + function Get_Non_Implicit_Subprogram (List : Iir_List) return Iir + is + El : Iir; + Res : Iir; + Ref_Type : Iir; + begin + -- Conditions: + -- 1. All the possible functions must return boolean. + -- 2. There is only one implicit function for universal or real. + Res := Null_Iir; + for I in Natural loop + El := Get_Nth_Element (List, I); + exit when El = Null_Iir; + if Get_Base_Type (Get_Return_Type (El)) /= Boolean_Type_Definition + then + return Null_Iir; + end if; + + if Get_Kind (El) = Iir_Kind_Implicit_Function_Declaration then + Ref_Type := Get_Type_Reference (El); + if Ref_Type = Universal_Integer_Type_Declaration + or Ref_Type = Universal_Real_Type_Declaration + then + if Res = Null_Iir then + Res := El; + else + return Null_Iir; + end if; + end if; + end if; + end loop; + return Res; + end Get_Non_Implicit_Subprogram; + + -- Honor the -fexplicit flag. + -- If LIST is composed of 2 declarations that matches the 'explicit' rule, + -- return the explicit declaration. + -- Otherwise, return NULL_IIR. + function Get_Explicit_Subprogram (List : Iir_List) return Iir + is + Sub1 : Iir; + Sub2 : Iir; + Res : Iir; + begin + if Get_Nbr_Elements (List) /= 2 then + return Null_Iir; + end if; + + Sub1 := Get_Nth_Element (List, 0); + Sub2 := Get_Nth_Element (List, 1); + + -- One must be an implicit declaration, the other must be an explicit + -- declaration. + if Get_Kind (Sub1) = Iir_Kind_Implicit_Function_Declaration then + if Get_Kind (Sub2) /= Iir_Kind_Function_Declaration then + return Null_Iir; + end if; + Res := Sub2; + elsif Get_Kind (Sub1) = Iir_Kind_Function_Declaration then + if Get_Kind (Sub2) /= Iir_Kind_Implicit_Function_Declaration then + return Null_Iir; + end if; + Res := Sub1; + else + Error_Kind ("get_explicit_subprogram", Sub1); + end if; + + -- They must have the same profile. + if Get_Subprogram_Hash (Sub1) /= Get_Subprogram_Hash (Sub2) + or else not Is_Same_Profile (Sub1, Sub2) + then + return Null_Iir; + end if; + + -- They must be declared in a package. + if Get_Kind (Get_Parent (Sub1)) /= Iir_Kind_Package_Declaration + or else Get_Kind (Get_Parent (Sub2)) /= Iir_Kind_Package_Declaration + then + return Null_Iir; + end if; + + return Res; + end Get_Explicit_Subprogram; + + -- Set when the -fexplicit option was adviced. + Explicit_Advice_Given : Boolean := False; + + function Sem_Operator (Expr : Iir; Res_Type : Iir; Arity : Positive) + return Iir + is + Operator : Name_Id; + Left, Right: Iir; + Interpretation : Name_Interpretation_Type; + Decl : Iir; + Overload_List : Iir_List; + Overload : Iir; + Res_Type_List : Iir; + Full_Compat : Iir; + + -- LEFT and RIGHT must be set. + function Set_Uniq_Interpretation (Decl : Iir) return Iir + is + Interface_Chain : Iir; + Err : Boolean; + begin + Set_Type (Expr, Get_Return_Type (Decl)); + Interface_Chain := Get_Interface_Declaration_Chain (Decl); + Err := False; + if Is_Overloaded (Left) then + Left := Sem_Expression_Ov + (Left, Get_Base_Type (Get_Type (Interface_Chain))); + if Left = Null_Iir then + Err := True; + else + if Arity = 1 then + Set_Operand (Expr, Left); + else + Set_Left (Expr, Left); + end if; + end if; + end if; + Check_Read (Left); + if Arity = 2 then + if Is_Overloaded (Right) then + Right := Sem_Expression_Ov + (Right, + Get_Base_Type (Get_Type (Get_Chain (Interface_Chain)))); + if Right = Null_Iir then + Err := True; + else + Set_Right (Expr, Right); + end if; + end if; + Check_Read (Right); + end if; + Destroy_Iir_List (Overload_List); + if not Err then + Set_Implementation (Expr, Decl); + Sem_Subprogram_Call_Finish (Expr, Decl); + return Eval_Expr_If_Static (Expr); + else + return Expr; + end if; + end Set_Uniq_Interpretation; + + -- Note: operator and implementation node of expr must be set. + procedure Error_Operator_Overload (List : Iir_List) is + begin + Error_Msg_Sem ("operator """ & Name_Table.Image (Operator) + & """ is overloaded", Expr); + Disp_Overload_List (List, Expr); + end Error_Operator_Overload; + + Interface_Chain : Iir; + begin + if Arity = 1 then + Left := Get_Operand (Expr); + Right := Null_Iir; + else + Left := Get_Left (Expr); + Right := Get_Right (Expr); + end if; + Operator := Iirs_Utils.Get_Operator_Name (Expr); + + if Get_Type (Expr) = Null_Iir then + -- First pass. + -- Semantize operands. + -- FIXME: should try to semantize right operand even if semantization + -- of left operand has failed ?? + if Get_Type (Left) = Null_Iir then + Left := Sem_Expression_Ov (Left, Null_Iir); + if Left = Null_Iir then + return Null_Iir; + end if; + if Arity = 1 then + Set_Operand (Expr, Left); + else + Set_Left (Expr, Left); + end if; + end if; + if Arity = 2 and then Get_Type (Right) = Null_Iir then + Right := Sem_Expression_Ov (Right, Null_Iir); + if Right = Null_Iir then + return Null_Iir; + end if; + Set_Right (Expr, Right); + end if; + + Overload_List := Create_Iir_List; + + -- Try to find an implementation among user defined function + Interpretation := Get_Interpretation (Operator); + while Valid_Interpretation (Interpretation) loop + Decl := Get_Non_Alias_Declaration (Interpretation); + + -- It is compatible with operand types ? + if Get_Kind (Decl) not in Iir_Kinds_Function_Declaration then + raise Internal_Error; + end if; + + -- LRM08 12.3 Visibility + -- [...] or all visible declarations denote the same named entity. + -- + -- GHDL: If DECL has already been seen, then skip it. + if Get_Seen_Flag (Decl) then + goto Next; + end if; + + -- Check return type. + if Res_Type /= Null_Iir + and then + not Are_Types_Compatible (Res_Type, Get_Return_Type (Decl)) + then + goto Next; + end if; + + Interface_Chain := Get_Interface_Declaration_Chain (Decl); + + -- Check arity. + + -- LRM93 2.5.2 Operator overloading + -- The subprogram specification of a unary operator must have + -- a single parameter [...] + -- The subprogram specification of a binary operator must have + -- two parameters [...] + -- + -- GHDL: So even in presence of default expression in a parameter, + -- a unary operation has to match with a binary operator. + if Iir_Chains.Get_Chain_Length (Interface_Chain) /= Arity then + goto Next; + end if; + + -- Check operands. + if not Is_Expr_Compatible (Get_Type (Interface_Chain), Left) then + goto Next; + end if; + if Arity = 2 then + if not Is_Expr_Compatible + (Get_Type (Get_Chain (Interface_Chain)), Right) + then + goto Next; + end if; + end if; + + -- Match. + Set_Seen_Flag (Decl, True); + Append_Element (Overload_List, Decl); + + << Next >> null; + Interpretation := Get_Next_Interpretation (Interpretation); + end loop; + + -- Clear seen_flags. + for I in Natural loop + Decl := Get_Nth_Element (Overload_List, I); + exit when Decl = Null_Iir; + Set_Seen_Flag (Decl, False); + end loop; + + -- The list of possible implementations was computed. + case Get_Nbr_Elements (Overload_List) is + when 0 => + Error_Msg_Sem + ("no function declarations for " & Disp_Node (Expr), Expr); + Destroy_Iir_List (Overload_List); + return Null_Iir; + + when 1 => + Decl := Get_First_Element (Overload_List); + return Set_Uniq_Interpretation (Decl); + + when others => + -- Preference for universal operator. + -- This roughly corresponds to: + -- + -- LRM 7.3.5 + -- An implicit conversion of a convertible universal operand + -- is applied if and only if the innermost complete context + -- determines a unique (numeric) target type for the implicit + -- conversion, and there is no legal interpretation of this + -- context without this conversion. + if Arity = 2 then + Decl := Get_Non_Implicit_Subprogram (Overload_List); + if Decl /= Null_Iir then + return Set_Uniq_Interpretation (Decl); + end if; + end if; + + Set_Implementation (Expr, Create_Overload_List (Overload_List)); + + -- Create the list of possible return types, if it is not yet + -- determined. + if Res_Type = Null_Iir then + Res_Type_List := Create_List_Of_Types (Overload_List); + if Is_Overload_List (Res_Type_List) then + -- There are many possible return types. + -- Try again. + Set_Type (Expr, Res_Type_List); + return Expr; + end if; + end if; + + -- The return type is known. + -- Search for explicit subprogram. + + -- It was impossible to find one solution. + Error_Operator_Overload (Overload_List); + + -- Give an advice. + if not Flags.Flag_Explicit + and then not Explicit_Advice_Given + and then Flags.Vhdl_Std < Vhdl_08 + then + Decl := Get_Explicit_Subprogram (Overload_List); + if Decl /= Null_Iir then + Error_Msg_Sem + ("(you may want to use the -fexplicit option)", Expr); + Explicit_Advice_Given := True; + end if; + end if; + + return Null_Iir; + end case; + else + -- Second pass + -- Find the uniq implementation for this call. + Overload := Get_Implementation (Expr); + Overload_List := Get_Overload_List (Overload); + Full_Compat := Null_Iir; + for I in Natural loop + Decl := Get_Nth_Element (Overload_List, I); + exit when Decl = Null_Iir; + -- FIXME: wrong: compatibilty with return type and args. + if Are_Types_Compatible (Get_Return_Type (Decl), Res_Type) then + if Full_Compat /= Null_Iir then + Error_Operator_Overload (Overload_List); + return Null_Iir; + else + Full_Compat := Decl; + end if; + end if; + end loop; + Free_Iir (Overload); + Overload := Get_Type (Expr); + Free_Overload_List (Overload); + return Set_Uniq_Interpretation (Full_Compat); + end if; + end Sem_Operator; + + -- Semantize LIT whose elements must be of type EL_TYPE, and return + -- the length. + -- FIXME: the errors are reported, but there is no mark of that. + function Sem_String_Literal (Lit: Iir; El_Type : Iir) return Natural + is + function Find_Literal (Etype : Iir_Enumeration_Type_Definition; + C : Character) + return Iir_Enumeration_Literal + is + Inter : Name_Interpretation_Type; + Id : Name_Id; + Decl : Iir; + begin + Id := Name_Table.Get_Identifier (C); + Inter := Get_Interpretation (Id); + while Valid_Interpretation (Inter) loop + Decl := Get_Declaration (Inter); + if Get_Kind (Decl) = Iir_Kind_Enumeration_Literal + and then Get_Type (Decl) = Etype + then + return Decl; + end if; + Inter := Get_Next_Interpretation (Inter); + end loop; + -- Character C is not visible... + if Find_Name_In_List (Get_Enumeration_Literal_List (Etype), Id) + = Null_Iir + then + -- ... because it is not defined. + Error_Msg_Sem + ("type " & Disp_Node (Etype) & " does not define character '" + & C & "'", Lit); + else + -- ... because it is not visible. + Error_Msg_Sem ("character '" & C & "' of type " + & Disp_Node (Etype) & " is not visible", Lit); + end if; + return Null_Iir; + end Find_Literal; + + Ptr : String_Fat_Acc; + El : Iir; + pragma Unreferenced (El); + Len : Nat32; + begin + Len := Get_String_Length (Lit); + + if Get_Kind (Lit) = Iir_Kind_Bit_String_Literal then + Set_Bit_String_0 (Lit, Find_Literal (El_Type, '0')); + Set_Bit_String_1 (Lit, Find_Literal (El_Type, '1')); + else + Ptr := Get_String_Fat_Acc (Lit); + + -- For a string_literal, check all characters of the string is a + -- literal of the type. + -- Always check, for visibility. + for I in 1 .. Len loop + El := Find_Literal (El_Type, Ptr (I)); + end loop; + end if; + + Set_Expr_Staticness (Lit, Locally); + + return Natural (Len); + end Sem_String_Literal; + + procedure Sem_String_Literal (Lit: Iir) + is + Lit_Type : constant Iir := Get_Type (Lit); + Lit_Base_Type : constant Iir := Get_Base_Type (Lit_Type); + + -- The subtype created for the literal. + N_Type: Iir; + -- type of the index of the array type. + Index_Type: Iir; + Len : Natural; + El_Type : Iir; + begin + El_Type := Get_Base_Type (Get_Element_Subtype (Lit_Base_Type)); + Len := Sem_String_Literal (Lit, El_Type); + + if Get_Constraint_State (Lit_Type) = Fully_Constrained then + -- The type of the context is constrained. + Index_Type := Get_Index_Type (Lit_Type, 0); + if Get_Type_Staticness (Index_Type) = Locally then + if Eval_Discrete_Type_Length (Index_Type) /= Iir_Int64 (Len) then + Error_Msg_Sem ("string length does not match that of " + & Disp_Node (Index_Type), Lit); + end if; + else + -- FIXME: emit a warning because of dubious construct (the type + -- of the string is not locally constrained) ? + null; + end if; + else + -- Context type is not constained. Set type of the string literal, + -- according to LRM93 7.3.2.2. + N_Type := Create_Unidim_Array_By_Length + (Lit_Base_Type, Iir_Int64 (Len), Lit); + Set_Type (Lit, N_Type); + Set_Literal_Subtype (Lit, N_Type); + end if; + end Sem_String_Literal; + + generic + -- Compare two elements, return true iff OP1 < OP2. + with function Lt (Op1, Op2 : Natural) return Boolean; + + -- Swap two elements. + with procedure Swap (From : Natural; To : Natural); + package Heap_Sort is + -- Heap sort the N elements. + procedure Sort (N : Natural); + end Heap_Sort; + + package body Heap_Sort is + -- An heap is an almost complete binary tree whose each edge is less + -- than or equal as its decendent. + + -- Bubble down element I of a partially ordered heap of length N in + -- array ARR. + procedure Bubble_Down (I, N : Natural) + is + Child : Natural; + Parent : Natural := I; + begin + loop + Child := 2 * Parent; + if Child < N and then Lt (Child, Child + 1) then + Child := Child + 1; + end if; + exit when Child > N; + exit when not Lt (Parent, Child); + Swap (Parent, Child); + Parent := Child; + end loop; + end Bubble_Down; + + -- Heap sort of ARR. + procedure Sort (N : Natural) + is + begin + -- Heapify + for I in reverse 1 .. N / 2 loop + Bubble_Down (I, N); + end loop; + + -- Sort + for I in reverse 2 .. N loop + Swap (1, I); + Bubble_Down (1, I - 1); + end loop; + end Sort; + end Heap_Sort; + + procedure Sem_String_Choices_Range (Choice_Chain : Iir; Sel : Iir) + is + -- True if others choice is present. + Has_Others : Boolean; + + -- Number of simple choices. + Nbr_Choices : Natural; + + -- Type of SEL. + Sel_Type : Iir; + + -- Type of the element of SEL. + Sel_El_Type : Iir; + -- Number of literals in the element type. + Sel_El_Length : Iir_Int64; + + -- Length of SEL (number of characters in SEL). + Sel_Length : Iir_Int64; + + -- Array of choices. + Arr : Iir_Array_Acc; + Index : Natural; + + -- True if length of a choice mismatches + Has_Length_Error : Boolean := False; + + El : Iir; + + -- Compare two elements of ARR. + -- Return true iff OP1 < OP2. + function Lt (Op1, Op2 : Natural) return Boolean is + begin + return Compare_String_Literals (Get_Choice_Expression (Arr (Op1)), + Get_Choice_Expression (Arr (Op2))) + = Compare_Lt; + end Lt; + + function Eq (Op1, Op2 : Natural) return Boolean is + begin + return Compare_String_Literals (Get_Choice_Expression (Arr (Op1)), + Get_Choice_Expression (Arr (Op2))) + = Compare_Eq; + end Eq; + + procedure Swap (From : Natural; To : Natural) + is + Tmp : Iir; + begin + Tmp := Arr (To); + Arr (To) := Arr (From); + Arr (From) := Tmp; + end Swap; + + package Str_Heap_Sort is new Heap_Sort (Lt => Lt, Swap => Swap); + + procedure Sem_Simple_Choice (Choice : Iir) + is + Expr : Iir; + begin + -- LRM93 8.8 + -- In such case, each choice appearing in any of the case statement + -- alternative must be a locally static expression whose value is of + -- the same length as that of the case expression. + Expr := Sem_Expression (Get_Choice_Expression (Choice), Sel_Type); + if Expr = Null_Iir then + Has_Length_Error := True; + return; + end if; + Set_Choice_Expression (Choice, Expr); + if Get_Expr_Staticness (Expr) < Locally then + Error_Msg_Sem ("choice must be locally static expression", Expr); + Has_Length_Error := True; + return; + end if; + Expr := Eval_Expr (Expr); + Set_Choice_Expression (Choice, Expr); + if Get_Kind (Expr) = Iir_Kind_Overflow_Literal then + Error_Msg_Sem + ("bound error during evaluation of choice expression", Expr); + Has_Length_Error := True; + elsif Eval_Discrete_Type_Length + (Get_String_Type_Bound_Type (Get_Type (Expr))) /= Sel_Length + then + Has_Length_Error := True; + Error_Msg_Sem + ("value not of the same length of the case expression", Expr); + return; + end if; + end Sem_Simple_Choice; + begin + -- LRM93 8.8 + -- If the expression is of one-dimensional character array type, then + -- the expression must be one of the following: + -- FIXME: to complete. + Sel_Type := Get_Type (Sel); + if not Is_One_Dimensional_Array_Type (Sel_Type) then + Error_Msg_Sem + ("expression must be discrete or one-dimension array subtype", Sel); + return; + end if; + if Get_Type_Staticness (Sel_Type) /= Locally then + Error_Msg_Sem ("array type must be locally static", Sel); + return; + end if; + Sel_Length := Eval_Discrete_Type_Length + (Get_String_Type_Bound_Type (Sel_Type)); + Sel_El_Type := Get_Element_Subtype (Sel_Type); + Sel_El_Length := Eval_Discrete_Type_Length (Sel_El_Type); + + Has_Others := False; + Nbr_Choices := 0; + El := Choice_Chain; + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Choice_By_None => + raise Internal_Error; + when Iir_Kind_Choice_By_Range => + Error_Msg_Sem + ("range choice are not allowed for non-discrete type", El); + when Iir_Kind_Choice_By_Expression => + Nbr_Choices := Nbr_Choices + 1; + Sem_Simple_Choice (El); + when Iir_Kind_Choice_By_Others => + if Has_Others then + Error_Msg_Sem ("duplicate others choice", El); + elsif Get_Chain (El) /= Null_Iir then + Error_Msg_Sem + ("choice others must be the last alternative", El); + end if; + Has_Others := True; + when others => + Error_Kind ("sem_string_choices_range", El); + end case; + El := Get_Chain (El); + end loop; + + -- Null choices. + if Sel_Length = 0 then + return; + end if; + if Has_Length_Error then + return; + end if; + + -- LRM 8.8 + -- + -- If the expression is the name of an object whose subtype is locally + -- static, wether a scalar type or an array type, then each value of the + -- subtype must be represented once and only once in the set of choices + -- of the case statement and no other value is allowed; [...] + + -- 1. Allocate Arr and fill it + Arr := new Iir_Array (1 .. Nbr_Choices); + Index := 0; + El := Choice_Chain; + while El /= Null_Iir loop + if Get_Kind (El) = Iir_Kind_Choice_By_Expression then + Index := Index + 1; + Arr (Index) := El; + end if; + El := Get_Chain (El); + end loop; + + -- 2. Sort Arr + Str_Heap_Sort.Sort (Nbr_Choices); + + -- 3. Check for duplicate choices + for I in 1 .. Nbr_Choices - 1 loop + if Eq (I, I + 1) then + Error_Msg_Sem ("duplicate choice with choice at " & + Disp_Location (Arr (I + 1)), + Arr (I)); + exit; + end if; + end loop; + + -- 4. Free Arr + Free (Arr); + + -- Check for missing choice. + -- Do not try to compute the expected number of choices as this can + -- easily overflow. + if not Has_Others then + declare + Nbr : Iir_Int64 := Iir_Int64 (Nbr_Choices); + begin + for I in 1 .. Sel_Length loop + Nbr := Nbr / Sel_El_Length; + if Nbr = 0 then + Error_Msg_Sem ("missing choice(s)", Choice_Chain); + exit; + end if; + end loop; + end; + end if; + end Sem_String_Choices_Range; + + procedure Sem_Choices_Range + (Choice_Chain : in out Iir; + Sub_Type : Iir; + Is_Sub_Range : Boolean; + Is_Case_Stmt : Boolean; + Loc : Location_Type; + Low : out Iir; + High : out Iir) + is + -- Number of positionnal choice. + Nbr_Pos : Iir_Int64; + + -- Number of named choices. + Nbr_Named : Natural; + + -- True if others choice is present. + Has_Others : Boolean; + + Has_Error : Boolean; + + -- True if SUB_TYPE has bounds. + Type_Has_Bounds : Boolean; + + Arr : Iir_Array_Acc; + Index : Natural; + Pos_Max : Iir_Int64; + El : Iir; + Prev_El : Iir; + + -- Staticness of the current choice. + Choice_Staticness : Iir_Staticness; + + -- Staticness of all the choices. + Staticness : Iir_Staticness; + + function Replace_By_Range_Choice (Name : Iir; Range_Type : Iir) + return Boolean + is + N_Choice : Iir; + Name1 : Iir; + begin + if not Are_Types_Compatible (Range_Type, Sub_Type) then + Not_Match (Name, Sub_Type); + return False; + end if; + + Name1 := Finish_Sem_Name (Name); + N_Choice := Create_Iir (Iir_Kind_Choice_By_Range); + Location_Copy (N_Choice, El); + Set_Chain (N_Choice, Get_Chain (El)); + Set_Associated_Expr (N_Choice, Get_Associated_Expr (El)); + Set_Associated_Chain (N_Choice, Get_Associated_Chain (El)); + Set_Same_Alternative_Flag (N_Choice, Get_Same_Alternative_Flag (El)); + Set_Choice_Range (N_Choice, Eval_Range_If_Static (Name1)); + Set_Choice_Staticness (N_Choice, Get_Type_Staticness (Range_Type)); + Free_Iir (El); + + if Prev_El = Null_Iir then + Choice_Chain := N_Choice; + else + Set_Chain (Prev_El, N_Choice); + end if; + El := N_Choice; + + return True; + end Replace_By_Range_Choice; + + -- Semantize a simple (by expression or by range) choice. + -- Return FALSE in case of error. + function Sem_Simple_Choice return Boolean + is + Expr : Iir; + Ent : Iir; + begin + if Get_Kind (El) = Iir_Kind_Choice_By_Range then + Expr := Get_Choice_Range (El); + Expr := Sem_Discrete_Range_Expression (Expr, Sub_Type, True); + if Expr = Null_Iir then + return False; + end if; + Expr := Eval_Range_If_Static (Expr); + Set_Choice_Range (El, Expr); + else + Expr := Get_Choice_Expression (El); + case Get_Kind (Expr) is + when Iir_Kind_Selected_Name + | Iir_Kind_Simple_Name + | Iir_Kind_Character_Literal + | Iir_Kind_Parenthesis_Name + | Iir_Kind_Selected_By_All_Name + | Iir_Kind_Attribute_Name => + Sem_Name (Expr); + Ent := Get_Named_Entity (Expr); + if Ent = Error_Mark then + return False; + end if; + + -- So range or expression ? + -- FIXME: share code with sem_name for slice/index. + case Get_Kind (Ent) is + when Iir_Kind_Range_Array_Attribute + | Iir_Kind_Reverse_Range_Array_Attribute + | Iir_Kind_Range_Expression => + return Replace_By_Range_Choice (Expr, Ent); + when Iir_Kind_Subtype_Declaration + | Iir_Kind_Type_Declaration => + Ent := Is_Type_Name (Expr); + Set_Expr_Staticness (Expr, Get_Type_Staticness (Ent)); + return Replace_By_Range_Choice (Expr, Ent); + when others => + Expr := Name_To_Expression + (Expr, Get_Base_Type (Sub_Type)); + end case; + when others => + Expr := Sem_Expression_Ov (Expr, Get_Base_Type (Sub_Type)); + end case; + if Expr = Null_Iir then + return False; + end if; + Expr := Eval_Expr_If_Static (Expr); + Set_Choice_Expression (El, Expr); + end if; + Set_Choice_Staticness (El, Get_Expr_Staticness (Expr)); + return True; + end Sem_Simple_Choice; + + -- Get low limit of ASSOC. + -- First, get the expression of the association, then the low limit. + -- ASSOC may be either association_by_range (in this case the low limit + -- is to be fetched), or association_by_expression (and the low limit + -- is the expression). + function Get_Low (Assoc : Iir) return Iir + is + Expr : Iir; + begin + case Get_Kind (Assoc) is + when Iir_Kind_Choice_By_Expression => + return Get_Choice_Expression (Assoc); + when Iir_Kind_Choice_By_Range => + Expr := Get_Choice_Range (Assoc); + case Get_Kind (Expr) is + when Iir_Kind_Range_Expression => + case Get_Direction (Expr) is + when Iir_To => + return Get_Left_Limit (Expr); + when Iir_Downto => + return Get_Right_Limit (Expr); + end case; + when others => + return Expr; + end case; + when others => + Error_Kind ("get_low", Assoc); + end case; + end Get_Low; + + function Get_High (Assoc : Iir) return Iir + is + Expr : Iir; + begin + case Get_Kind (Assoc) is + when Iir_Kind_Choice_By_Expression => + return Get_Choice_Expression (Assoc); + when Iir_Kind_Choice_By_Range => + Expr := Get_Choice_Range (Assoc); + case Get_Kind (Expr) is + when Iir_Kind_Range_Expression => + case Get_Direction (Expr) is + when Iir_To => + return Get_Right_Limit (Expr); + when Iir_Downto => + return Get_Left_Limit (Expr); + end case; + when others => + return Expr; + end case; + when others => + Error_Kind ("get_high", Assoc); + end case; + end Get_High; + + -- Compare two elements of ARR. + -- Return true iff OP1 < OP2. + function Lt (Op1, Op2 : Natural) return Boolean is + begin + return + Eval_Pos (Get_Low (Arr (Op1))) < Eval_Pos (Get_Low (Arr (Op2))); + end Lt; + + -- Swap two elements of ARR. + procedure Swap (From : Natural; To : Natural) + is + Tmp : Iir; + begin + Tmp := Arr (To); + Arr (To) := Arr (From); + Arr (From) := Tmp; + end Swap; + + package Disc_Heap_Sort is new Heap_Sort (Lt => Lt, Swap => Swap); + begin + Low := Null_Iir; + High := Null_Iir; + + -- First: + -- semantize the choices + -- compute the range of positionnal choices + -- compute the number of choice elements (extracted from lists). + -- check for others presence. + Nbr_Pos := 0; + Nbr_Named := 0; + Has_Others := False; + Has_Error := False; + Staticness := Locally; + El := Choice_Chain; + Prev_El := Null_Iir; + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Choice_By_None => + Nbr_Pos := Nbr_Pos + 1; + when Iir_Kind_Choice_By_Expression + | Iir_Kind_Choice_By_Range => + if Sem_Simple_Choice then + Choice_Staticness := Get_Choice_Staticness (El); + Staticness := Min (Staticness, Choice_Staticness); + if Choice_Staticness /= Locally + and then Is_Case_Stmt + then + -- FIXME: explain why + Error_Msg_Sem ("choice is not locally static", El); + end if; + else + Has_Error := True; + end if; + Nbr_Named := Nbr_Named + 1; + when Iir_Kind_Choice_By_Name => + -- It is not possible to have such a choice in an array + -- aggregate. + -- Should have been caught previously. + raise Internal_Error; + when Iir_Kind_Choice_By_Others => + if Has_Others then + Error_Msg_Sem ("duplicate others choice", El); + elsif Get_Chain (El) /= Null_Iir then + Error_Msg_Sem + ("choice others should be the last alternative", El); + end if; + Has_Others := True; + when others => + Error_Kind ("sem_choices_range", El); + end case; + Prev_El := El; + El := Get_Chain (El); + end loop; + + if Has_Error then + -- Nothing can be done here... + return; + end if; + if Nbr_Pos > 0 and then Nbr_Named > 0 then + -- LRM93 7.3.2.2 + -- Apart from the final element with the single choice OTHERS, the + -- rest (if any) of the element associations of an array aggregate + -- must be either all positionnal or all named. + Error_Msg_Sem + ("element associations must be all positional or all named", Loc); + return; + end if; + + -- For a positional aggregate. + if Nbr_Pos > 0 then + -- Check number of elements match, but only if it is possible. + if Get_Type_Staticness (Sub_Type) /= Locally then + return; + end if; + Pos_Max := Eval_Discrete_Type_Length (Sub_Type); + if (not Has_Others and not Is_Sub_Range) + and then Nbr_Pos < Pos_Max + then + Error_Msg_Sem ("not enough elements associated", Loc); + elsif Nbr_Pos > Pos_Max then + Error_Msg_Sem ("too many elements associated", Loc); + end if; + return; + end if; + + -- Second: + -- Create the list of choices + if Nbr_Named = 0 and then Has_Others then + -- This is only a others association. + return; + end if; + if Staticness /= Locally then + -- Emit a message for aggregrate. The message has already been + -- emitted for a case stmt. + -- FIXME: what about individual associations? + if not Is_Case_Stmt then + -- LRM93 §7.3.2.2 + -- A named association of an array aggregate is allowed to have + -- a choice that is not locally static, or likewise a choice that + -- is a null range, only if the aggregate includes a single + -- element association and the element association has a single + -- choice. + if Nbr_Named > 1 or Has_Others then + Error_Msg_Sem ("not static choice exclude others choice", Loc); + end if; + end if; + return; + end if; + + -- Set TYPE_HAS_BOUNDS + case Get_Kind (Sub_Type) is + when Iir_Kind_Enumeration_Type_Definition + | Iir_Kind_Enumeration_Subtype_Definition + | Iir_Kind_Integer_Subtype_Definition => + Type_Has_Bounds := True; + when Iir_Kind_Integer_Type_Definition => + Type_Has_Bounds := False; + when others => + Error_Kind ("sem_choice_range(3)", Sub_Type); + end case; + + Arr := new Iir_Array (1 .. Nbr_Named); + Index := 0; + + declare + procedure Add_Choice (Choice : Iir; A_Type : Iir) + is + Ok : Boolean; + Expr : Iir; + begin + Ok := True; + if Type_Has_Bounds + and then Get_Type_Staticness (A_Type) = Locally + then + if Get_Kind (Choice) = Iir_Kind_Choice_By_Range then + Expr := Get_Choice_Range (Choice); + if Get_Expr_Staticness (Expr) = Locally then + Ok := Eval_Is_Range_In_Bound (Expr, A_Type, True); + end if; + else + Expr := Get_Choice_Expression (Choice); + if Get_Expr_Staticness (Expr) = Locally then + Ok := Eval_Is_In_Bound (Expr, A_Type); + end if; + end if; + if not Ok then + Error_Msg_Sem + (Disp_Node (Expr) & " out of index range", Choice); + end if; + end if; + if Ok then + Index := Index + 1; + Arr (Index) := Choice; + end if; + end Add_Choice; + begin + -- Fill the array. + El := Choice_Chain; + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Choice_By_None => + -- Only named associations are considered. + raise Internal_Error; + when Iir_Kind_Choice_By_Expression + | Iir_Kind_Choice_By_Range => + Add_Choice (El, Sub_Type); + when Iir_Kind_Choice_By_Others => + null; + when others => + Error_Kind ("sem_choices_range(2)", El); + end case; + El := Get_Chain (El); + end loop; + end; + + -- Third: + -- Sort the list + Disc_Heap_Sort.Sort (Index); + + -- Set low and high bounds. + if Index > 0 then + Low := Get_Low (Arr (1)); + High := Get_High (Arr (Index)); + else + Low := Null_Iir; + High := Null_Iir; + end if; + + -- Fourth: + -- check for lacking choice (if no others) + -- check for overlapping choices + declare + -- Emit an error message for absence of choices in position L to H + -- of index type BT at location LOC. + procedure Error_No_Choice (Bt : Iir; + L, H : Iir_Int64; + Loc : Location_Type) + is + begin + if L = H then + Error_Msg_Sem ("no choice for " & Disp_Discrete (Bt, L), Loc); + else + Error_Msg_Sem + ("no choices for " & Disp_Discrete (Bt, L) + & " to " & Disp_Discrete (Bt, H), Loc); + end if; + end Error_No_Choice; + + -- Lowest and highest bounds. + Lb, Hb : Iir; + Pos : Iir_Int64; + Pos_Max : Iir_Int64; + E_Pos : Iir_Int64; + + Bt : Iir; + begin + Bt := Get_Base_Type (Sub_Type); + if not Is_Sub_Range + and then Get_Type_Staticness (Sub_Type) = Locally + and then Type_Has_Bounds + then + Get_Low_High_Limit (Get_Range_Constraint (Sub_Type), Lb, Hb); + else + Lb := Low; + Hb := High; + end if; + -- Checks all values between POS and POS_MAX are handled. + Pos := Eval_Pos (Lb); + Pos_Max := Eval_Pos (Hb); + if Pos > Pos_Max then + -- Null range. + Free (Arr); + return; + end if; + for I in 1 .. Index loop + E_Pos := Eval_Pos (Get_Low (Arr (I))); + if E_Pos > Pos_Max then + -- Choice out of bound, already handled. + Error_No_Choice (Bt, Pos, Pos_Max, Get_Location (Arr (I))); + -- Avoid other errors. + Pos := Pos_Max + 1; + exit; + end if; + if Pos < E_Pos and then not Has_Others then + Error_No_Choice (Bt, Pos, E_Pos - 1, Get_Location (Arr (I))); + elsif Pos > E_Pos then + if Pos + 1 = E_Pos then + Error_Msg_Sem + ("duplicate choice for " & Disp_Discrete (Bt, Pos), + Arr (I)); + else + Error_Msg_Sem + ("duplicate choices for " & Disp_Discrete (Bt, E_Pos) + & " to " & Disp_Discrete (Bt, Pos), Arr (I)); + end if; + end if; + Pos := Eval_Pos (Get_High (Arr (I))) + 1; + end loop; + if Pos /= Pos_Max + 1 and then not Has_Others then + Error_No_Choice (Bt, Pos, Pos_Max, Loc); + end if; + end; + + Free (Arr); + end Sem_Choices_Range; + +-- -- Find out the MIN and the MAX of an all named association choice list. +-- -- It also returns the number of elements associed (counting range). +-- procedure Sem_Find_Min_Max_Association_Choice_List +-- (List: Iir_Association_Choices_List; +-- Min: out Iir; +-- Max: out Iir; +-- Length: out natural) +-- is +-- Min_Res: Iir := null; +-- Max_Res: Iir := null; +-- procedure Update_With_Value (Val: Iir) is +-- begin +-- if Min_Res = null then +-- Min_Res := Val; +-- Max_Res := Val; +-- elsif Get_Value (Val) < Get_Value (Min_Res) then +-- Min_Res := Val; +-- elsif Get_Value (Val) > Get_Value (Max_Res) then +-- Max_Res := Val; +-- end if; +-- end Update_With_Value; + +-- Number_Elements: Natural; + +-- procedure Update (Choice: Iir) is +-- Left, Right: Iir; +-- Expr: Iir; +-- begin +-- case Get_Kind (Choice) is +-- when Iir_Kind_Choice_By_Expression => +-- Update_With_Value (Get_Expression (Choice)); +-- Number_Elements := Number_Elements + 1; +-- when Iir_Kind_Choice_By_Range => +-- Expr := Get_Expression (Choice); +-- Left := Get_Left_Limit (Expr); +-- Right := Get_Right_Limit (Expr); +-- Update_With_Value (Left); +-- Update_With_Value (Right); +-- -- There can't be null range. +-- case Get_Direction (Expr) is +-- when Iir_To => +-- Number_Elements := Number_Elements + +-- Natural (Get_Value (Right) - Get_Value (Left) + 1); +-- when Iir_Downto => +-- Number_Elements := Number_Elements + +-- Natural (Get_Value (Left) - Get_Value (Right) + 1); +-- end case; +-- when others => +-- Error_Kind ("sem_find_min_max_association_choice_list", Choice); +-- end case; +-- end Update; + +-- El: Iir; +-- Sub_List: Iir_Association_Choices_List; +-- Sub_El: Iir; +-- begin +-- Number_Elements := 0; +-- for I in Natural loop +-- El := Get_Nth_Element (List, I); +-- exit when El = null; +-- case Get_Kind (El) is +-- when Iir_Kind_Choice_By_List => +-- Sub_List := Get_Choice_List (El); +-- for J in Natural loop +-- Sub_El := Get_Nth_Element (Sub_List, J); +-- exit when Sub_El = null; +-- Update (Sub_El); +-- end loop; +-- when others => +-- Update (El); +-- end case; +-- end loop; +-- Min := Min_Res; +-- Max := Max_Res; +-- Length := Number_Elements; +-- end Sem_Find_Min_Max_Association_Choice_List; + + -- Perform semantisation on a (sub)aggregate AGGR, which is of type + -- A_TYPE. + -- return FALSE is case of failure + function Sem_Record_Aggregate (Aggr: Iir_Aggregate; A_Type: Iir) + return boolean + is + Base_Type : constant Iir := Get_Base_Type (A_Type); + El_List : constant Iir_List := Get_Elements_Declaration_List (Base_Type); + + -- Type of the element. + El_Type : Iir; + + Matches: Iir_Array (0 .. Get_Nbr_Elements (El_List) - 1); + Ok : Boolean; + + -- Add a choice for element REC_EL. + -- Checks the element is not already associated. + -- Checks type of expression is compatible with type of element. + procedure Add_Match (El : Iir; Rec_El : Iir_Element_Declaration) + is + Ass_Type : Iir; + Pos : constant Natural := Natural (Get_Element_Position (Rec_El)); + begin + if Matches (Pos) /= Null_Iir then + Error_Msg_Sem + (Disp_Node (Matches (Pos)) & " was already associated", El); + Ok := False; + return; + end if; + Matches (Pos) := El; + + -- LRM 7.3.2.1 Record aggregates + -- An element association with more than once choice, [...], is + -- only allowed if the elements specified are all of the same type. + Ass_Type := Get_Type (Rec_El); + if El_Type = Null_Iir then + El_Type := Ass_Type; + elsif not Are_Types_Compatible (El_Type, Ass_Type) then + Error_Msg_Sem ("elements are not of the same type", El); + Ok := False; + end if; + end Add_Match; + + -- Semantize a simple choice: extract the record element corresponding + -- to the expression, and create a choice_by_name. + -- FIXME: should mutate the node. + function Sem_Simple_Choice (Ass : Iir) return Iir + is + N_El : Iir; + Expr : Iir; + Aggr_El : Iir_Element_Declaration; + begin + Expr := Get_Choice_Expression (Ass); + if Get_Kind (Expr) /= Iir_Kind_Simple_Name then + Error_Msg_Sem ("element association must be a simple name", Ass); + Ok := False; + return Ass; + end if; + Aggr_El := Find_Name_In_List + (Get_Elements_Declaration_List (Base_Type), Get_Identifier (Expr)); + if Aggr_El = Null_Iir then + Error_Msg_Sem + ("record has no such element " & Disp_Node (Ass), Ass); + Ok := False; + return Ass; + end if; + + N_El := Create_Iir (Iir_Kind_Choice_By_Name); + Location_Copy (N_El, Ass); + Set_Choice_Name (N_El, Aggr_El); + Set_Associated_Expr (N_El, Get_Associated_Expr (Ass)); + Set_Associated_Chain (N_El, Get_Associated_Chain (Ass)); + Set_Chain (N_El, Get_Chain (Ass)); + Set_Same_Alternative_Flag (N_El, Get_Same_Alternative_Flag (Ass)); + + Xref_Ref (Expr, Aggr_El); + Free_Iir (Ass); + Free_Iir (Expr); + Add_Match (N_El, Aggr_El); + return N_El; + end Sem_Simple_Choice; + + Assoc_Chain : Iir; + El, Prev_El : Iir; + Expr: Iir; + Has_Named : Boolean; + Rec_El_Index : Natural; + Value_Staticness : Iir_Staticness; + begin + Ok := True; + Assoc_Chain := Get_Association_Choices_Chain (Aggr); + Matches := (others => Null_Iir); + Value_Staticness := Locally; + + El_Type := Null_Iir; + Has_Named := False; + Rec_El_Index := 0; + Prev_El := Null_Iir; + El := Assoc_Chain; + while El /= Null_Iir loop + Expr := Get_Associated_Expr (El); + + -- If there is an associated expression with the choice, then the + -- choice is a new alternative, and has no expected type. + if Expr /= Null_Iir then + El_Type := Null_Iir; + end if; + + case Get_Kind (El) is + when Iir_Kind_Choice_By_None => + if Has_Named then + Error_Msg_Sem ("positional association after named one", El); + Ok := False; + elsif Rec_El_Index > Matches'Last then + Error_Msg_Sem ("too many elements", El); + exit; + else + Add_Match (El, Get_Nth_Element (El_List, Rec_El_Index)); + Rec_El_Index := Rec_El_Index + 1; + end if; + when Iir_Kind_Choice_By_Expression => + Has_Named := True; + El := Sem_Simple_Choice (El); + -- This creates a choice_by_name, which replaces the + -- choice_by_expression. + if Prev_El = Null_Iir then + Set_Association_Choices_Chain (Aggr, El); + else + Set_Chain (Prev_El, El); + end if; + when Iir_Kind_Choice_By_Others => + Has_Named := True; + if Get_Chain (El) /= Null_Iir then + Error_Msg_Sem + ("choice others must be the last alternative", El); + end if; + declare + Found : Boolean := False; + begin + for I in Matches'Range loop + if Matches (I) = Null_Iir then + Add_Match (El, Get_Nth_Element (El_List, I)); + Found := True; + end if; + end loop; + if not Found then + Error_Msg_Sem ("no element for choice others", El); + Ok := False; + end if; + end; + when others => + Error_Kind ("sem_record_aggregate", El); + end case; + + -- Semantize the expression associated. + if Expr /= Null_Iir then + if El_Type /= Null_Iir then + Expr := Sem_Expression (Expr, El_Type); + if Expr /= Null_Iir then + Set_Associated_Expr (El, Eval_Expr_If_Static (Expr)); + Value_Staticness := Min (Value_Staticness, + Get_Expr_Staticness (Expr)); + else + Ok := False; + end if; + else + -- This case is not possible unless there is an error. + if Ok then + raise Internal_Error; + end if; + end if; + end if; + + Prev_El := El; + El := Get_Chain (El); + end loop; + + -- Check for missing associations. + for I in Matches'Range loop + if Matches (I) = Null_Iir then + Error_Msg_Sem + ("no value for " & Disp_Node (Get_Nth_Element (El_List, I)), + Aggr); + Ok := False; + end if; + end loop; + Set_Value_Staticness (Aggr, Value_Staticness); + Set_Expr_Staticness (Aggr, Min (Globally, Value_Staticness)); + return Ok; + end Sem_Record_Aggregate; + + -- Information for each dimension of an aggregate. + type Array_Aggr_Info is record + -- False if one sub-aggregate has no others choices. + -- If FALSE, the dimension is constrained. + Has_Others : Boolean := True; + + -- True if one sub-aggregate is by named/by position. + Has_Named : Boolean := False; + Has_Positional : Boolean := False; + + -- True if one sub-aggregate is dynamic. + Has_Dynamic : Boolean := False; + + -- LOW and HIGH limits for the dimension. + Low : Iir := Null_Iir; + High : Iir := Null_Iir; + + -- Minimum length of the dimension. This is a minimax. + Min_Length : Natural := 0; + + -- If not NULL_IIR, this is the bounds of the dimension. + -- If every dimension has bounds, then the aggregate is constrained. + Index_Subtype : Iir := Null_Iir; + + -- True if there is an error. + Error : Boolean := False; + end record; + + type Array_Aggr_Info_Arr is array (Natural range <>) of Array_Aggr_Info; + + -- Semantize an array aggregate AGGR of *base type* A_TYPE. + -- The type of the array is computed into A_SUBTYPE. + -- DIM is the dimension index in A_TYPE. + -- Return FALSE in case of error. + procedure Sem_Array_Aggregate_Type_1 (Aggr: Iir; + A_Type: Iir; + Infos : in out Array_Aggr_Info_Arr; + Constrained : Boolean; + Dim: Natural) + is + Assoc_Chain : Iir; + Choice: Iir; + Is_Positional: Tri_State_Type; + Has_Positional_Choice: Boolean; + Low, High : Iir; + Index_List : Iir_List; + Has_Others : Boolean; + + Len : Natural; + + -- Type of the index (this is also the type of the choices). + Index_Type : Iir; + + --Index_Subtype : Iir; + Index_Subtype_Constraint : Iir_Range_Expression; + Index_Constraint : Iir_Range_Expression; -- FIXME: 'range. + Choice_Staticness : Iir_Staticness; + + Info : Array_Aggr_Info renames Infos (Dim); + begin + Index_List := Get_Index_Subtype_List (A_Type); + Index_Type := Get_Index_Type (Index_List, Dim - 1); + + -- Sem choices. + case Get_Kind (Aggr) is + when Iir_Kind_Aggregate => + Assoc_Chain := Get_Association_Choices_Chain (Aggr); + Sem_Choices_Range (Assoc_Chain, Index_Type, not Constrained, False, + Get_Location (Aggr), Low, High); + Set_Association_Choices_Chain (Aggr, Assoc_Chain); + + -- Update infos. + if Low /= Null_Iir + and then (Info.Low = Null_Iir + or else Eval_Pos (Low) < Eval_Pos (Info.Low)) + then + Info.Low := Low; + end if; + if High /= Null_Iir + and then (Info.High = Null_Iir + or else Eval_Pos (High) > Eval_Pos (Info.High)) + then + Info.High := High; + end if; + + -- Determine if the aggregate is positionnal or named; + -- and compute choice staticness. + Is_Positional := Unknown; + Choice_Staticness := Locally; + Has_Positional_Choice := False; + Has_Others := False; + Len := 0; + Choice := Assoc_Chain; + while Choice /= Null_Iir loop + case Get_Kind (Choice) is + when Iir_Kind_Choice_By_Range + | Iir_Kind_Choice_By_Expression => + Is_Positional := False; + Choice_Staticness := + Iirs.Min (Choice_Staticness, + Get_Choice_Staticness (Choice)); + -- FIXME: not true for range. + Len := Len + 1; + when Iir_Kind_Choice_By_None => + Has_Positional_Choice := True; + Len := Len + 1; + when Iir_Kind_Choice_By_Others => + if not Constrained then + Error_Msg_Sem ("'others' choice not allowed for an " + & "aggregate in this context", Aggr); + Infos (Dim).Error := True; + return; + end if; + Has_Others := True; + when others => + Error_Kind ("sem_array_aggregate_type", Choice); + end case; + -- LRM93 7.3.2.2 + -- Apart from the final element with the single choice + -- OTHERS, the rest (if any) of the element + -- associations of an array aggregate must be either + -- all positionnal or all named. + if Has_Positional_Choice then + if Is_Positional = False then + -- The error has already been emited + -- by sem_choices_range. + Infos (Dim).Error := True; + return; + end if; + Is_Positional := True; + end if; + Choice := Get_Chain (Choice); + end loop; + + Info.Min_Length := Integer'Max (Info.Min_Length, Len); + + if Choice_Staticness = Unknown then + -- This is possible when a choice is erroneous. + Infos (Dim).Error := True; + return; + end if; + + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + Len := Sem_String_Literal + (Aggr, Get_Base_Type (Get_Element_Subtype (A_Type))); + Assoc_Chain := Null_Iir; + Info.Min_Length := Integer'Max (Info.Min_Length, Len); + Is_Positional := True; + Has_Others := False; + Choice_Staticness := Locally; + + when others => + Error_Kind ("sem_array_aggregate_type_1", Aggr); + end case; + + if Is_Positional = True then + Info.Has_Positional := True; + end if; + if Is_Positional = False then + Info.Has_Named := True; + end if; + if not Has_Others then + Info.Has_Others := False; + end if; + + -- LRM93 7.3.2.2 + -- A named association of an array aggregate is allowed to have a choice + -- that is not locally static, [or likewise a choice that is a null + -- range], only if the aggregate includes a single element association + -- and this element association has a single choice. + if Is_Positional = False and then Choice_Staticness /= Locally then + Choice := Assoc_Chain; + if not Is_Chain_Length_One (Assoc_Chain) or else + (Get_Kind (Choice) /= Iir_Kind_Choice_By_Expression + and then Get_Kind (Choice) /= Iir_Kind_Choice_By_Range) + then + Error_Msg_Sem ("non-locally static choice for an aggregate is " + & "allowed only if only choice", Aggr); + Infos (Dim).Error := True; + return; + end if; + Info.Has_Dynamic := True; + end if; + + -- Compute bounds of the index if there is no index subtype. + if Info.Index_Subtype = Null_Iir and then Has_Others = False then + -- LRM93 7.3.2.2 + -- the direction of the index subtype of the aggregate is that of the + -- index subtype of the base type of the aggregate. + + if Is_Positional = True then + -- LRM93 7.3.2.2 + -- For a positionnal aggregate, [...] the leftmost bound is given + -- by S'LEFT where S is the index subtype of the base type of the + -- array; [...] the rightmost bound is determined by the direction + -- of the index subtype and the number of element. + if Get_Type_Staticness (Index_Type) = Locally then + Info.Index_Subtype := Create_Range_Subtype_By_Length + (Index_Type, Iir_Int64 (Len), Get_Location (Aggr)); + end if; + else + -- Create an index subtype. + case Get_Kind (Index_Type) is + when Iir_Kind_Integer_Subtype_Definition => + Info.Index_Subtype := Create_Iir (Get_Kind (Index_Type)); + when Iir_Kind_Enumeration_Type_Definition + | Iir_Kind_Enumeration_Subtype_Definition => + Info.Index_Subtype := + Create_Iir (Iir_Kind_Enumeration_Subtype_Definition); + when others => + Error_Kind ("sem_array_aggregate_type2", Index_Type); + end case; + Location_Copy (Info.Index_Subtype, Aggr); + Set_Base_Type (Info.Index_Subtype, Get_Base_Type (Index_Type)); + Index_Constraint := Get_Range_Constraint (Index_Type); + + -- LRM93 7.3.2.2 + -- If the aggregate appears in one of the above contexts, then the + -- direction of the index subtype of the aggregate is that of the + -- corresponding constrained array subtype; [...] + Index_Subtype_Constraint := Create_Iir (Iir_Kind_Range_Expression); + Location_Copy (Index_Subtype_Constraint, Aggr); + Set_Range_Constraint + (Info.Index_Subtype, Index_Subtype_Constraint); + Set_Type_Staticness (Info.Index_Subtype, Choice_Staticness); + Set_Expr_Staticness (Index_Subtype_Constraint, Choice_Staticness); + + -- LRM93 7.3.2.2 + -- For an aggregate that has named associations, the leftmost and + -- the rightmost bounds are determined by the direction of the + -- index subtype of the aggregate and the smallest and largest + -- choice given. + if Choice_Staticness = Locally then + if Low = Null_Iir or High = Null_Iir then + -- Avoid error propagation. + Set_Range_Constraint (Info.Index_Subtype, + Get_Range_Constraint (Index_Type)); + Free_Iir (Index_Subtype_Constraint); + else + Set_Direction (Index_Subtype_Constraint, + Get_Direction (Index_Constraint)); + case Get_Direction (Index_Constraint) is + when Iir_To => + Set_Left_Limit (Index_Subtype_Constraint, Low); + Set_Right_Limit (Index_Subtype_Constraint, High); + when Iir_Downto => + Set_Left_Limit (Index_Subtype_Constraint, High); + Set_Right_Limit (Index_Subtype_Constraint, Low); + end case; + end if; + else + -- Dynamic aggregate. + declare + Expr : Iir; + Choice : Iir; + begin + Choice := Assoc_Chain; + case Get_Kind (Choice) is + when Iir_Kind_Choice_By_Expression => + Expr := Get_Choice_Expression (Choice); + Set_Direction (Index_Subtype_Constraint, + Get_Direction (Index_Constraint)); + Set_Left_Limit (Index_Subtype_Constraint, Expr); + Set_Right_Limit (Index_Subtype_Constraint, Expr); + when Iir_Kind_Choice_By_Range => + Expr := Get_Choice_Range (Choice); + Set_Range_Constraint (Info.Index_Subtype, Expr); + -- FIXME: avoid allocation-free. + Free_Iir (Index_Subtype_Constraint); + when others => + raise Internal_Error; + end case; + end; + end if; + end if; + --Set_Type_Staticness + -- (A_Subtype, Iirs.Min (Get_Type_Staticness (A_Subtype), + -- Get_Type_Staticness (Index_Subtype))); + --Append_Element (Get_Index_List (A_Subtype), Index_Subtype); + elsif Has_Others = False then + -- Check the subaggregate bounds are the same. + if Is_Positional = True then + if Eval_Pos (Eval_Discrete_Range_Left (Get_Range_Constraint + (Info.Index_Subtype))) + /= Eval_Pos (Eval_Discrete_Range_Left (Get_Range_Constraint + (Index_Type))) + then + Error_Msg_Sem ("subaggregate bounds mismatch", Aggr); + else + if Eval_Discrete_Type_Length (Info.Index_Subtype) + /= Iir_Int64 (Len) + then + Error_Msg_Sem ("subaggregate length mismatch", Aggr); + end if; + end if; + else + declare + L, H : Iir; + begin + Get_Low_High_Limit + (Get_Range_Constraint (Info.Index_Subtype), L, H); + if Eval_Pos (L) /= Eval_Pos (Low) + or else Eval_Pos (H) /= Eval_Pos (H) + then + Error_Msg_Sem ("subagregate bounds mismatch", Aggr); + end if; + end; + end if; + end if; + + -- Semantize aggregate elements. + if Dim = Get_Nbr_Elements (Index_List) then + -- A type has been found for AGGR, semantize AGGR as if it was + -- an aggregate with a subtype. + + if Get_Kind (Aggr) = Iir_Kind_Aggregate then + -- LRM93 7.3.2.2: + -- the expression of each element association must be of the + -- element type. + declare + El : Iir; + Element_Type : Iir; + Expr : Iir; + Value_Staticness : Iir_Staticness; + Expr_Staticness : Iir_Staticness; + begin + Element_Type := Get_Element_Subtype (A_Type); + El := Assoc_Chain; + Value_Staticness := Locally; + while El /= Null_Iir loop + Expr := Get_Associated_Expr (El); + if Expr /= Null_Iir then + Expr := Sem_Expression (Expr, Element_Type); + if Expr /= Null_Iir then + Expr_Staticness := Get_Expr_Staticness (Expr); + Set_Expr_Staticness + (Aggr, Min (Get_Expr_Staticness (Aggr), + Expr_Staticness)); + Set_Associated_Expr (El, Eval_Expr_If_Static (Expr)); + + -- FIXME: handle name/others in translate. + -- if Get_Kind (Expr) = Iir_Kind_Aggregate then + -- Expr_Staticness := Get_Value_Staticness (Expr); + -- end if; + Value_Staticness := Min (Value_Staticness, + Expr_Staticness); + else + Info.Error := True; + end if; + end if; + El := Get_Chain (El); + end loop; + Set_Value_Staticness (Aggr, Value_Staticness); + end; + end if; + else + declare + Assoc : Iir; + Value_Staticness : Iir_Staticness; + begin + Assoc := Null_Iir; + Choice := Assoc_Chain; + Value_Staticness := Locally; + while Choice /= Null_Iir loop + if Get_Associated_Expr (Choice) /= Null_Iir then + Assoc := Get_Associated_Expr (Choice); + end if; + case Get_Kind (Assoc) is + when Iir_Kind_Aggregate => + Sem_Array_Aggregate_Type_1 + (Assoc, A_Type, Infos, Constrained, Dim + 1); + Value_Staticness := Min (Value_Staticness, + Get_Value_Staticness (Assoc)); + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + if Dim + 1 = Get_Nbr_Elements (Index_List) then + Sem_Array_Aggregate_Type_1 + (Assoc, A_Type, Infos, Constrained, Dim + 1); + else + Error_Msg_Sem + ("string literal not allowed here", Assoc); + Infos (Dim + 1).Error := True; + end if; + when others => + Error_Msg_Sem ("sub-aggregate expected", Assoc); + Infos (Dim + 1).Error := True; + end case; + Choice := Get_Chain (Choice); + end loop; + Set_Value_Staticness (Aggr, Value_Staticness); + end; + end if; + end Sem_Array_Aggregate_Type_1; + + -- Semantize an array aggregate whose type is AGGR_TYPE. + -- If CONSTRAINED is true, then the aggregate appears in one of the + -- context and can have an 'others' choice. + -- If CONSTRAINED is false, the aggregate can not have an 'others' choice. + -- Create a subtype for this aggregate. + -- Return NULL_IIR in case of error, or AGGR if not. + function Sem_Array_Aggregate_Type + (Aggr : Iir; Aggr_Type : Iir; Constrained : Boolean) + return Iir + is + A_Subtype: Iir; + Base_Type : Iir; + Index_List : constant Iir_List := Get_Index_Subtype_List (Aggr_Type); + Nbr_Dim : constant Natural := Get_Nbr_Elements (Index_List); + Infos : Array_Aggr_Info_Arr (1 .. Nbr_Dim); + Aggr_Constrained : Boolean; + Info, Prev_Info : Iir_Aggregate_Info; + begin + -- Semantize the aggregate. + Sem_Array_Aggregate_Type_1 (Aggr, Aggr_Type, Infos, Constrained, 1); + + Aggr_Constrained := True; + for I in Infos'Range loop + -- Return now in case of error. + if Infos (I).Error then + return Null_Iir; + end if; + if Infos (I).Index_Subtype = Null_Iir then + Aggr_Constrained := False; + end if; + end loop; + Base_Type := Get_Base_Type (Aggr_Type); + + -- FIXME: should reuse AGGR_TYPE iff AGGR_TYPE is fully constrained + -- and statically match the subtype of the aggregate. + if Aggr_Constrained then + A_Subtype := Create_Array_Subtype (Base_Type, Get_Location (Aggr)); + for I in Infos'Range loop + Append_Element (Get_Index_Subtype_List (A_Subtype), + Infos (I).Index_Subtype); + Set_Type_Staticness + (A_Subtype, + Iirs.Min (Get_Type_Staticness (A_Subtype), + Get_Type_Staticness (Infos (I).Index_Subtype))); + end loop; + Set_Index_Constraint_Flag (A_Subtype, True); + Set_Constraint_State (A_Subtype, Fully_Constrained); + Set_Type (Aggr, A_Subtype); + Set_Literal_Subtype (Aggr, A_Subtype); + else + -- Free unused indexes subtype. + for I in Infos'Range loop + declare + St : constant Iir := Infos (I).Index_Subtype; + begin + if St /= Null_Iir then + Free_Iir (Get_Range_Constraint (St)); + Free_Iir (St); + end if; + end; + end loop; + end if; + + Prev_Info := Null_Iir; + for I in Infos'Range loop + -- Create info and link. + Info := Create_Iir (Iir_Kind_Aggregate_Info); + if I = 1 then + Set_Aggregate_Info (Aggr, Info); + else + Set_Sub_Aggregate_Info (Prev_Info, Info); + end if; + Prev_Info := Info; + + -- Fill info. + Set_Aggr_Dynamic_Flag (Info, Infos (I).Has_Dynamic); + Set_Aggr_Named_Flag (Info, Infos (I).Has_Named); + Set_Aggr_Low_Limit (Info, Infos (I).Low); + Set_Aggr_High_Limit (Info, Infos (I).High); + Set_Aggr_Min_Length (Info, Iir_Int32 (Infos (I).Min_Length)); + Set_Aggr_Others_Flag (Info, Infos (I).Has_Others); + end loop; + return Aggr; + end Sem_Array_Aggregate_Type; + + -- Semantize aggregate EXPR whose type is expected to be A_TYPE. + -- A_TYPE cannot be null_iir (this case is handled in sem_expression_ov) + function Sem_Aggregate (Expr: Iir_Aggregate; A_Type: Iir) + return Iir_Aggregate is + begin + pragma Assert (A_Type /= Null_Iir); + + -- An aggregate is at most globally static. + Set_Expr_Staticness (Expr, Globally); + + Set_Type (Expr, A_Type); -- FIXME: should free old type + case Get_Kind (A_Type) is + when Iir_Kind_Array_Subtype_Definition => + return Sem_Array_Aggregate_Type + (Expr, A_Type, Get_Index_Constraint_Flag (A_Type)); + when Iir_Kind_Array_Type_Definition => + return Sem_Array_Aggregate_Type (Expr, A_Type, False); + when Iir_Kind_Record_Type_Definition + | Iir_Kind_Record_Subtype_Definition => + if not Sem_Record_Aggregate (Expr, A_Type) then + return Null_Iir; + end if; + return Expr; + when others => + Error_Msg_Sem ("type " & Disp_Node (A_Type) & " is not composite", + Expr); + return Null_Iir; + end case; + end Sem_Aggregate; + + -- Transform LIT into a physical_literal. + -- LIT can be either a not semantized physical literal or + -- a simple name that is a physical unit. In the later case, a physical + -- literal is created. + function Sem_Physical_Literal (Lit: Iir) return Iir + is + Unit_Name : Iir; + Unit_Type : Iir; + Res: Iir; + begin + case Get_Kind (Lit) is + when Iir_Kind_Physical_Int_Literal + | Iir_Kind_Physical_Fp_Literal => + Unit_Name := Get_Unit_Name (Lit); + Res := Lit; + when Iir_Kind_Unit_Declaration => + Res := Create_Iir (Iir_Kind_Physical_Int_Literal); + Location_Copy (Res, Lit); + Set_Value (Res, 1); + Unit_Name := Null_Iir; + raise Program_Error; + when Iir_Kinds_Denoting_Name => + Res := Create_Iir (Iir_Kind_Physical_Int_Literal); + Location_Copy (Res, Lit); + Set_Value (Res, 1); + Unit_Name := Lit; + when others => + Error_Kind ("sem_physical_literal", Lit); + end case; + Unit_Name := Sem_Denoting_Name (Unit_Name); + if Get_Kind (Get_Named_Entity (Unit_Name)) /= Iir_Kind_Unit_Declaration + then + Error_Class_Match (Unit_Name, "unit"); + Set_Named_Entity (Unit_Name, Create_Error_Name (Unit_Name)); + end if; + Set_Unit_Name (Res, Unit_Name); + Unit_Type := Get_Type (Unit_Name); + Set_Type (Res, Unit_Type); + + -- LRM93 7.4.2 + -- 1. a literal of type TIME. + -- + -- LRM93 7.4.1 + -- 1. a literal of any type other than type TIME; + Set_Expr_Staticness (Res, Get_Expr_Staticness (Unit_Name)); + --Eval_Check_Constraints (Res); + return Res; + end Sem_Physical_Literal; + + -- Semantize an allocator by expression or an allocator by subtype. + function Sem_Allocator (Expr : Iir; A_Type : Iir) return Iir + is + Arg: Iir; + Arg_Type : Iir; + begin + Set_Expr_Staticness (Expr, None); + + Arg_Type := Get_Allocator_Designated_Type (Expr); + + if Arg_Type = Null_Iir then + -- Expression was not analyzed. + case Iir_Kinds_Allocator (Get_Kind (Expr)) is + when Iir_Kind_Allocator_By_Expression => + Arg := Get_Expression (Expr); + pragma Assert (Get_Kind (Arg) = Iir_Kind_Qualified_Expression); + Arg := Sem_Expression (Arg, Null_Iir); + if Arg = Null_Iir then + return Null_Iir; + end if; + Check_Read (Arg); + Set_Expression (Expr, Arg); + Arg_Type := Get_Type (Arg); + when Iir_Kind_Allocator_By_Subtype => + Arg := Get_Subtype_Indication (Expr); + Arg := Sem_Types.Sem_Subtype_Indication (Arg); + Set_Subtype_Indication (Expr, Arg); + Arg := Get_Type_Of_Subtype_Indication (Arg); + if Arg = Null_Iir then + return Null_Iir; + end if; + -- LRM93 7.3.6 + -- If an allocator includes a subtype indication and if the + -- type of the object created is an array type, then the + -- subtype indication must either denote a constrained + -- subtype or include an explicit index constraint. + if not Is_Fully_Constrained_Type (Arg) then + Error_Msg_Sem + ("allocator of unconstrained " & + Disp_Node (Arg) & " is not allowed", Expr); + end if; + -- LRM93 7.3.6 + -- A subtype indication that is part of an allocator must + -- not include a resolution function. + if Is_Anonymous_Type_Definition (Arg) + and then Get_Resolution_Indication (Arg) /= Null_Iir + then + Error_Msg_Sem ("subtype indication must not include" + & " a resolution function", Expr); + end if; + Arg_Type := Arg; + end case; + Set_Allocator_Designated_Type (Expr, Arg_Type); + end if; + + -- LRM 7.3.6 Allocators + -- The type of the access value returned by an allocator must be + -- determinable solely from the context, but using the fact that the + -- value returned is of an access type having the named designated + -- type. + if A_Type = Null_Iir then + -- Type of the context is not yet known. + return Expr; + else + if not Is_Allocator_Type (A_Type, Expr) then + if Get_Kind (A_Type) /= Iir_Kind_Access_Type_Definition then + if Get_Kind (A_Type) /= Iir_Kind_Error then + Error_Msg_Sem ("expected type is not an access type", Expr); + end if; + else + Not_Match (Expr, A_Type); + end if; + return Null_Iir; + end if; + Set_Type (Expr, A_Type); + return Expr; + end if; + end Sem_Allocator; + + procedure Check_Read_Aggregate (Aggr : Iir) + is + pragma Unreferenced (Aggr); + begin + -- FIXME: todo. + null; + end Check_Read_Aggregate; + + -- Check EXPR can be read. + procedure Check_Read (Expr : Iir) + is + Obj : Iir; + begin + if Expr = Null_Iir then + return; + end if; + + Obj := Expr; + loop + case Get_Kind (Obj) is + when Iir_Kind_Signal_Declaration + | Iir_Kind_Constant_Declaration + | Iir_Kind_Interface_Constant_Declaration + | Iir_Kind_Variable_Declaration + | Iir_Kind_Attribute_Value + | Iir_Kind_Iterator_Declaration + | Iir_Kind_Guard_Signal_Declaration => + return; + when Iir_Kinds_Quantity_Declaration => + return; + when Iir_Kind_File_Declaration + | Iir_Kind_Interface_File_Declaration => + -- LRM 4.3.2 Interface declarations + -- The value of an object is said to be read [...] + -- - When the object is a file and a READ operation is + -- performed on the file. + return; + when Iir_Kind_Object_Alias_Declaration => + Obj := Get_Name (Obj); + when Iir_Kind_Interface_Signal_Declaration + | Iir_Kind_Interface_Variable_Declaration => + case Get_Mode (Obj) is + when Iir_In_Mode + | Iir_Inout_Mode + | Iir_Buffer_Mode => + null; + when Iir_Out_Mode + | Iir_Linkage_Mode => + Error_Msg_Sem (Disp_Node (Obj) & " cannot be read", Expr); + when Iir_Unknown_Mode => + raise Internal_Error; + end case; + return; + when Iir_Kind_Enumeration_Literal + | Iir_Kind_Physical_Int_Literal + | Iir_Kind_Physical_Fp_Literal + | Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal + | Iir_Kind_Character_Literal + | Iir_Kind_Integer_Literal + | Iir_Kind_Floating_Point_Literal + | Iir_Kind_Null_Literal + | Iir_Kind_Unit_Declaration + | Iir_Kind_Simple_Aggregate + | Iir_Kind_Overflow_Literal => + return; + when Iir_Kinds_Monadic_Operator + | Iir_Kinds_Dyadic_Operator + | Iir_Kind_Function_Call => + return; + when Iir_Kind_Parenthesis_Expression => + Obj := Get_Expression (Obj); + when Iir_Kind_Qualified_Expression => + return; + when Iir_Kind_Type_Conversion + | Iir_Kind_Allocator_By_Expression + | Iir_Kind_Allocator_By_Subtype + | Iir_Kind_Implicit_Dereference + | Iir_Kind_Dereference + | Iir_Kind_Attribute_Name => + return; + when Iir_Kinds_Scalar_Type_Attribute + | Iir_Kinds_Type_Attribute + | Iir_Kinds_Array_Attribute + | Iir_Kind_Image_Attribute + | Iir_Kind_Value_Attribute + | Iir_Kinds_Name_Attribute + | Iir_Kinds_Signal_Attribute + | Iir_Kinds_Signal_Value_Attribute => + return; + when Iir_Kind_Aggregate => + Check_Read_Aggregate (Obj); + return; + when Iir_Kind_Indexed_Name + | Iir_Kind_Slice_Name + | Iir_Kind_Selected_Element => + -- FIXME: speed up using Base_Name + -- Obj := Get_Base_Name (Obj); + Obj := Get_Prefix (Obj); + when Iir_Kind_Simple_Name + | Iir_Kind_Selected_Name => + Obj := Get_Named_Entity (Obj); + when Iir_Kind_Error => + return; + when others => + Error_Kind ("check_read", Obj); + end case; + end loop; + end Check_Read; + + procedure Check_Update (Expr : Iir) + is + pragma Unreferenced (Expr); + begin + null; + end Check_Update; + + -- Emit an error if the constant EXPR is deferred and cannot be used in + -- the current context. + procedure Check_Constant_Restriction (Expr : Iir; Loc : Iir) + is + Lib : Iir; + Cur_Lib : Iir; + begin + -- LRM93 §2.6 + -- Within a package declaration that contains the declaration + -- of a deferred constant, and within the body of that package, + -- before the end of the corresponding full declaration, the + -- use of a name that denotes the deferred constant is only + -- allowed in the default expression for a local generic, + -- local port or formal parameter. + if Get_Deferred_Declaration_Flag (Expr) = False + or else Get_Deferred_Declaration (Expr) /= Null_Iir + then + -- The constant declaration is not deferred + -- or the it has been fully declared. + return; + end if; + + Lib := Get_Parent (Expr); + if Get_Kind (Lib) = Iir_Kind_Design_Unit then + Lib := Get_Library_Unit (Lib); + -- FIXME: the parent of the constant is the library unit or + -- the design unit ? + raise Internal_Error; + end if; + Cur_Lib := Get_Library_Unit (Sem.Get_Current_Design_Unit); + if (Get_Kind (Cur_Lib) = Iir_Kind_Package_Declaration + and then Lib = Cur_Lib) + or else (Get_Kind (Cur_Lib) = Iir_Kind_Package_Body + and then Get_Package (Cur_Lib) = Lib) + then + Error_Msg_Sem ("invalid use of a deferred constant", Loc); + end if; + end Check_Constant_Restriction; + + -- Set semantic to EXPR. + -- Replace simple_name with the referenced node, + -- Set type to nodes, + -- Resolve overloading + + -- If A_TYPE is not null, then EXPR must be of type A_TYPE. + -- Return null in case of error. + function Sem_Expression_Ov (Expr: Iir; A_Type1: Iir) return Iir + is + A_Type: Iir; + begin +-- -- Avoid to run sem_expression_ov when a node was already semantized +-- -- except to resolve overload. +-- if Get_Type (Expr) /= Null_Iir then +-- -- EXPR was already semantized. +-- if A_Type1 = null or else not Is_Overload_List (Get_Type (Expr)) then +-- -- This call to sem_expression_ov do not add any informations. +-- Check_Restrictions (Expr, Restriction); +-- return Expr; +-- end if; +-- -- This is an overload list that will be reduced. +-- end if; + + -- A_TYPE must be a type definition and not a subtype. + if A_Type1 /= Null_Iir then + A_Type := Get_Base_Type (A_Type1); + if A_Type /= A_Type1 then + raise Internal_Error; + end if; + else + A_Type := Null_Iir; + end if; + + case Get_Kind (Expr) is + when Iir_Kind_Selected_Name + | Iir_Kind_Simple_Name + | Iir_Kind_Character_Literal + | Iir_Kind_Parenthesis_Name + | Iir_Kind_Selected_By_All_Name + | Iir_Kind_Attribute_Name => + declare + E : Iir; + begin + E := Get_Named_Entity (Expr); + if E = Null_Iir then + Sem_Name (Expr); + E := Get_Named_Entity (Expr); + if E = Null_Iir then + raise Internal_Error; + end if; + end if; + if E = Error_Mark then + return Null_Iir; + end if; + if Get_Kind (E) = Iir_Kind_Constant_Declaration + and then not Deferred_Constant_Allowed + then + Check_Constant_Restriction (E, Expr); + end if; + E := Name_To_Expression (Expr, A_Type); + return E; + end; + + when Iir_Kinds_Monadic_Operator => + return Sem_Operator (Expr, A_Type, 1); + + when Iir_Kinds_Dyadic_Operator => + return Sem_Operator (Expr, A_Type, 2); + + when Iir_Kind_Enumeration_Literal + | Iir_Kinds_Object_Declaration => + -- All these case have already a type. + if Get_Type (Expr) = Null_Iir then + return Null_Iir; + end if; + if A_Type /= Null_Iir + and then not Are_Basetypes_Compatible + (A_Type, Get_Base_Type (Get_Type (Expr))) + then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + return Expr; + + when Iir_Kind_Integer_Literal => + Set_Expr_Staticness (Expr, Locally); + if A_Type = Null_Iir then + Set_Type (Expr, Convertible_Integer_Type_Definition); + return Expr; + elsif Get_Kind (A_Type) = Iir_Kind_Integer_Type_Definition then + Set_Type (Expr, A_Type); + return Expr; + else + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + + when Iir_Kind_Floating_Point_Literal => + Set_Expr_Staticness (Expr, Locally); + if A_Type = Null_Iir then + Set_Type (Expr, Convertible_Real_Type_Definition); + return Expr; + elsif Get_Kind (A_Type) = Iir_Kind_Floating_Type_Definition then + Set_Type (Expr, A_Type); + return Expr; + else + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + + when Iir_Kind_Physical_Int_Literal + | Iir_Kind_Physical_Fp_Literal + | Iir_Kind_Unit_Declaration => + declare + Res: Iir; + begin + Res := Sem_Physical_Literal (Expr); + if Res = Null_Iir then + return Null_Iir; + end if; + if A_Type /= Null_Iir and then Get_Type (Res) /= A_Type then + Not_Match (Res, A_Type); + return Null_Iir; + end if; + return Res; + end; + + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + -- LRM93 7.3.1 Literals + -- The type of a string or bit string literal must be + -- determinable solely from the context in whcih the literal + -- appears, excluding the literal itself [...] + if A_Type = Null_Iir then + return Expr; + end if; + + if not Is_String_Literal_Type (A_Type, Expr) then + Not_Match (Expr, A_Type); + return Null_Iir; + else + Replace_Type (Expr, A_Type); + Sem_String_Literal (Expr); + return Expr; + end if; + + when Iir_Kind_Null_Literal => + Set_Expr_Staticness (Expr, Locally); + -- GHDL: the LRM doesn't explain how the type of NULL is + -- determined. Use the same rule as string or aggregates. + if A_Type = Null_Iir then + return Expr; + end if; + if not Is_Null_Literal_Type (A_Type) then + Error_Msg_Sem ("null literal can only be access type", Expr); + return Null_Iir; + else + Set_Type (Expr, A_Type); + return Expr; + end if; + + when Iir_Kind_Aggregate => + -- LRM93 7.3.2 Aggregates + -- The type of an aggregate must be determinable solely from the + -- context in which the aggregate appears, excluding the aggregate + -- itself but [...] + if A_Type = Null_Iir then + return Expr; + else + return Sem_Aggregate (Expr, A_Type); + end if; + + when Iir_Kind_Parenthesis_Expression => + declare + Sub_Expr : Iir; + begin + Sub_Expr := Get_Expression (Expr); + Sub_Expr := Sem_Expression_Ov (Sub_Expr, A_Type1); + if Sub_Expr = Null_Iir then + return Null_Iir; + end if; + Set_Expression (Expr, Sub_Expr); + Set_Type (Expr, Get_Type (Sub_Expr)); + Set_Expr_Staticness (Expr, Get_Expr_Staticness (Sub_Expr)); + return Expr; + end; + + when Iir_Kind_Qualified_Expression => + declare + N_Type: Iir; + Res: Iir; + begin + N_Type := Sem_Type_Mark (Get_Type_Mark (Expr)); + Set_Type_Mark (Expr, N_Type); + N_Type := Get_Type (N_Type); + Set_Type (Expr, N_Type); + if A_Type /= Null_Iir + and then not Are_Types_Compatible (A_Type, N_Type) + then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + Res := Sem_Expression (Get_Expression (Expr), N_Type); + if Res = Null_Iir then + return Null_Iir; + end if; + Check_Read (Res); + Set_Expression (Expr, Res); + Set_Expr_Staticness (Expr, Min (Get_Expr_Staticness (Res), + Get_Type_Staticness (N_Type))); + return Expr; + end; + + when Iir_Kind_Allocator_By_Expression + | Iir_Kind_Allocator_By_Subtype => + return Sem_Allocator (Expr, A_Type); + + when Iir_Kinds_Procedure_Declaration => + Error_Msg_Sem + (Disp_Node (Expr) & " cannot be used as an expression", Expr); + return Null_Iir; + + when others => + Error_Kind ("sem_expression_ov", Expr); + return Null_Iir; + end case; + end Sem_Expression_Ov; + + -- If A_TYPE is not null, then EXPR must be of type A_TYPE. + -- Return null in case of error. + function Sem_Expression (Expr: Iir; A_Type: Iir) return Iir + is + A_Type1: Iir; + Res: Iir; + Expr_Type : Iir; + begin + if Check_Is_Expression (Expr, Expr) = Null_Iir then + return Null_Iir; + end if; + + -- Can't try to run sem_expression_ov when a node was already semantized + Expr_Type := Get_Type (Expr); + if Expr_Type /= Null_Iir and then not Is_Overload_List (Expr_Type) then + -- Checks types. + -- This is necessary when the first call to sem_expression was done + -- with A_TYPE set to NULL_IIR and results in setting the type of + -- EXPR. + if A_Type /= Null_Iir + and then not Are_Types_Compatible (Expr_Type, A_Type) + then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + return Expr; + end if; + + -- A_TYPE must be a type definition and not a subtype. + if A_Type /= Null_Iir then + A_Type1 := Get_Base_Type (A_Type); + else + A_Type1 := Null_Iir; + end if; + + case Get_Kind (Expr) is + when Iir_Kind_Aggregate => + Res := Sem_Aggregate (Expr, A_Type); + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + if A_Type = Null_Iir then + Res := Sem_Expression_Ov (Expr, Null_Iir); + else + if not Is_String_Literal_Type (A_Type, Expr) then + Not_Match (Expr, A_Type); + return Null_Iir; + end if; + Set_Type (Expr, A_Type); + Sem_String_Literal (Expr); + return Expr; + end if; + when others => + Res := Sem_Expression_Ov (Expr, A_Type1); + end case; + + if Res /= Null_Iir and then Is_Overloaded (Res) then + -- FIXME: clarify between overload and not determinable from the + -- context. + Error_Overload (Expr); + if Get_Type (Res) /= Null_Iir then + Disp_Overload_List (Get_Overload_List (Get_Type (Res)), Expr); + end if; + return Null_Iir; + end if; + return Res; + end Sem_Expression; + + function Sem_Composite_Expression (Expr : Iir) return Iir + is + Res : Iir; + begin + Res := Sem_Expression_Ov (Expr, Null_Iir); + if Res = Null_Iir or else Get_Type (Res) = Null_Iir then + return Res; + elsif Is_Overload_List (Get_Type (Res)) then + declare + List : constant Iir_List := Get_Overload_List (Get_Type (Res)); + Res_Type : Iir; + Atype : Iir; + begin + Res_Type := Null_Iir; + for I in Natural loop + Atype := Get_Nth_Element (List, I); + exit when Atype = Null_Iir; + if Is_Aggregate_Type (Atype) then + Add_Result (Res_Type, Atype); + end if; + end loop; + + if Res_Type = Null_Iir then + Error_Overload (Expr); + return Null_Iir; + elsif Is_Overload_List (Res_Type) then + Error_Overload (Expr); + Disp_Overload_List (Get_Overload_List (Res_Type), Expr); + Free_Overload_List (Res_Type); + return Null_Iir; + else + return Sem_Expression_Ov (Expr, Res_Type); + end if; + end; + else + -- Either an error (already handled) or not overloaded. Type + -- matching will be done later (when the target is analyzed). + return Res; + end if; + end Sem_Composite_Expression; + + function Sem_Expression_Universal (Expr : Iir) return Iir + is + Expr1 : Iir; + Expr_Type : Iir; + El : Iir; + Res : Iir; + List : Iir_List; + begin + Expr1 := Sem_Expression_Ov (Expr, Null_Iir); + if Expr1 = Null_Iir then + return Null_Iir; + end if; + Expr_Type := Get_Type (Expr1); + if Expr_Type = Null_Iir then + -- FIXME: improve message + Error_Msg_Sem ("bad expression for a scalar", Expr); + return Null_Iir; + end if; + if not Is_Overload_List (Expr_Type) then + return Expr1; + end if; + + List := Get_Overload_List (Expr_Type); + Res := Null_Iir; + for I in Natural loop + El := Get_Nth_Element (List, I); + exit when El = Null_Iir; + if El = Universal_Integer_Type_Definition + or El = Convertible_Integer_Type_Definition + or El = Universal_Real_Type_Definition + or El = Convertible_Real_Type_Definition + then + if Res = Null_Iir then + Res := El; + else + Error_Overload (Expr1); + Disp_Overload_List (List, Expr1); + return Null_Iir; + end if; + end if; + end loop; + if Res = Null_Iir then + Error_Overload (Expr1); + Disp_Overload_List (List, Expr1); + return Null_Iir; + end if; + return Sem_Expression_Ov (Expr1, Res); + end Sem_Expression_Universal; + + function Sem_Case_Expression (Expr : Iir) return Iir + is + Expr1 : Iir; + Expr_Type : Iir; + El : Iir; + Res : Iir; + List : Iir_List; + begin + Expr1 := Sem_Expression_Ov (Expr, Null_Iir); + if Expr1 = Null_Iir then + return Null_Iir; + end if; + Expr_Type := Get_Type (Expr1); + if Expr_Type = Null_Iir then + -- Possible only if the type cannot be determined without the + -- context (aggregate or string literal). + Error_Msg_Sem + ("cannot determine the type of choice expression", Expr); + if Get_Kind (Expr1) = Iir_Kind_Aggregate then + Error_Msg_Sem + ("(use a qualified expression of the form T'(xxx).)", Expr); + end if; + return Null_Iir; + end if; + if not Is_Overload_List (Expr_Type) then + return Expr1; + end if; + + -- In case of overload, try to find one match. + -- FIXME: match only character types. + + -- LRM93 8.8 Case statement + -- This type must be determinable independently of the context in which + -- the expression occurs, but using the fact that the expression must be + -- of a discrete type or a one-dimensional character array type. + List := Get_Overload_List (Expr_Type); + Res := Null_Iir; + for I in Natural loop + El := Get_Nth_Element (List, I); + exit when El = Null_Iir; + if Get_Kind (El) in Iir_Kinds_Discrete_Type_Definition + or else Is_One_Dimensional_Array_Type (El) + then + if Res = Null_Iir then + Res := El; + else + Error_Overload (Expr1); + Disp_Overload_List (List, Expr1); + return Null_Iir; + end if; + end if; + end loop; + if Res = Null_Iir then + Error_Overload (Expr1); + Disp_Overload_List (List, Expr1); + return Null_Iir; + end if; + return Sem_Expression_Ov (Expr1, Get_Base_Type (Res)); + end Sem_Case_Expression; + + function Sem_Condition (Cond : Iir) return Iir + is + Res : Iir; + Op : Iir; + begin + if Vhdl_Std < Vhdl_08 then + Res := Sem_Expression (Cond, Boolean_Type_Definition); + + Check_Read (Res); + return Res; + else + -- LRM08 9.2.9 + -- If, without overload resolution (see 12.5), the expression is + -- of type BOOLEAN defined in package STANDARD, or if, assuming a + -- rule requiring the expression to be of type BOOLEAN defined in + -- package STANDARD, overload resolution can determine at least one + -- interpretation of each constituent of the innermost complete + -- context including the expression, then the condition operator is + -- not applied. + + -- GHDL: what does the second alternative mean ? Any example ? + + Res := Sem_Expression_Ov (Cond, Null_Iir); + + if Res = Null_Iir then + return Res; + end if; + + if not Is_Overloaded (Res) + and then Get_Type (Res) = Boolean_Type_Definition + then + Check_Read (Res); + return Res; + end if; + + -- LRM08 9.2.9 + -- Otherwise, the condition operator is implicitely applied, and the + -- type of the expresion with the implicit application shall be + -- BOOLEAN defined in package STANDARD. + + Op := Create_Iir (Iir_Kind_Condition_Operator); + Location_Copy (Op, Res); + Set_Operand (Op, Res); + + Res := Sem_Operator (Op, Boolean_Type_Definition, 1); + Check_Read (Res); + return Res; + end if; + end Sem_Condition; + +end Sem_Expr; |