-- 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 Grt.Algos; with Vhdl.Std_Package; use Vhdl.Std_Package; with Errorout; use Errorout; with Flags; use Flags; with Vhdl.Sem_Scopes; use Vhdl.Sem_Scopes; with Vhdl.Sem_Names; use Vhdl.Sem_Names; with Vhdl.Sem; with Name_Table; with Str_Table; with Iirs_Utils; use Iirs_Utils; with Vhdl.Evaluation; use Vhdl.Evaluation; with Iir_Chains; use Iir_Chains; with Vhdl.Sem_Types; with Vhdl.Sem_Stmts; use Vhdl.Sem_Stmts; with Vhdl.Sem_Assocs; use Vhdl.Sem_Assocs; with Vhdl.Sem_Decls; with Xrefs; use Xrefs; package body Vhdl.Sem_Expr is -- 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 pragma Assert (not Is_Overload_List (A_Type)); 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 an existing type by another one. raise Internal_Error; end if; end if; if A_Type = Null_Iir then return; 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 Compatibility_Level is begin if Left = Right then return Fully_Compatible; end if; case Get_Kind (Left) is when Iir_Kind_Integer_Type_Definition => if Right = Convertible_Integer_Type_Definition then if Left = Universal_Integer_Type_Definition then return Fully_Compatible; else return Via_Conversion; end if; elsif Left = Convertible_Integer_Type_Definition and then Get_Kind (Right) = Iir_Kind_Integer_Type_Definition then if Right = Universal_Integer_Type_Definition then return Fully_Compatible; else return Via_Conversion; end if; end if; when Iir_Kind_Floating_Type_Definition => if Right = Convertible_Real_Type_Definition then if Left = Universal_Real_Type_Definition then return Fully_Compatible; else return Via_Conversion; end if; elsif Left = Convertible_Real_Type_Definition and then Get_Kind (Right) = Iir_Kind_Floating_Type_Definition then if Right = Universal_Real_Type_Definition then return Fully_Compatible; else return Via_Conversion; end if; end if; when others => null; end case; return Not_Compatible; end Are_Basetypes_Compatible; function Are_Types_Compatible (Left: Iir; Right: Iir) return Compatibility_Level is begin return Are_Basetypes_Compatible (Get_Base_Type (Left), Get_Base_Type (Right)); end Are_Types_Compatible; function Are_Nodes_Compatible (Left: Iir; Right: Iir) return Compatibility_Level 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 Compatibility_Level is El : Iir; Right_List : Iir_List; It : List_Iterator; Level : Compatibility_Level; begin pragma Assert (not Is_Overload_List (Left_Type)); if Is_Overload_List (Right_Types) then Right_List := Get_Overload_List (Right_Types); Level := Not_Compatible; It := List_Iterate (Right_List); while Is_Valid (It) loop El := Get_Element (It); Level := Compatibility_Level'Max (Level, Are_Types_Compatible (Left_Type, El)); if Level = Fully_Compatible then return Fully_Compatible; end if; Next (It); end loop; return Level; 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 Compatibility_Level is Left_Type : constant Iir := Get_Base_Type (Get_Type (Left)); Right_Type : constant Iir := Get_Type (Right); begin -- 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 ("compatibility_nodes", Left_Type); end case; return Compatibility_Types1 (Left_Type, Right_Type); end Compatibility_Nodes; function Is_String_Type (A_Type : 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; -- FIXME: character type return True; end Is_String_Type; -- 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 El_Bt : Iir; begin if not Is_String_Type (A_Type) then return False; end if; El_Bt := Get_Base_Type (Get_Element_Subtype (A_Type)); -- LRM87 7.3.1 -- ... (for string literals) or of type BIT (for bit string literals). if Flags.Vhdl_Std = Vhdl_87 and then Get_Bit_String_Base (Expr) /= Base_None 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 Compatibility_Level is Expr_Type : constant Iir := Get_Type (Expr); Is_Compatible : Boolean; 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 => Is_Compatible := Is_Aggregate_Type (A_Type); when Iir_Kind_String_Literal8 => Is_Compatible := Is_String_Literal_Type (A_Type, Expr); when Iir_Kind_Null_Literal => Is_Compatible := Is_Null_Literal_Type (A_Type); when Iir_Kind_Allocator_By_Expression | Iir_Kind_Allocator_By_Subtype => Is_Compatible := 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? Is_Compatible := False; end case; if Is_Compatible then return Fully_Compatible; else return Not_Compatible; end if; 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_Kind_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 | Iir_Kind_Signature => Error_Msg_Sem (+Loc, "%n not allowed in an expression", +Expr); return Null_Iir; when Iir_Kind_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_External_Name => 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_Psl_Endpoint_Declaration => 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; -- 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; It : List_Iterator; 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; It := List_Iterate (Type_List_List); while Is_Valid (It) loop El := Get_Element (It); 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; Next (It); 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; It : List_Iterator; Res : Iir; El : Iir; Tmp : Iir; begin if Is_Overload_List (List1) then List1_List := Get_Overload_List (List1); Res := Null_Iir; It := List_Iterate (List1_List); while Is_Valid (It) loop El := Get_Element (It); 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; Next (It); end loop; return Res; else return Search_Overloaded_Type (List2, List1); end if; end Search_Compatible_Type; -- Analyze 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 analyzed 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 (Expr); Right := Get_Right_Limit_Expr (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 if A_Type /= Null_Iir then -- Can continue with the error. if Left = Null_Iir then Left := Create_Error_Expr (Get_Left_Limit_Expr (Expr), A_Type); end if; if Right = Null_Iir then Right := Create_Error_Expr (Get_Right_Limit_Expr (Expr), A_Type); end if; else -- Error. return Null_Iir; end if; 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 (+Left, "bad expression for a scalar"); return Null_Iir; end if; if Right_Type = Null_Iir then Error_Msg_Sem (+Right, "bad expression for a scalar"); 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) /= Not_Compatible and then Compatibility_Types1 (Universal_Integer_Type_Definition, Right_Type) /= Not_Compatible then Expr_Type := Universal_Integer_Type_Definition; elsif Compatibility_Types1 (Universal_Real_Type_Definition, Left_Type) /= Not_Compatible and then Compatibility_Types1 (Universal_Real_Type_Definition, Right_Type) /= Not_Compatible then Expr_Type := Universal_Real_Type_Definition; else -- FIXME: handle overload Error_Msg_Sem (+Expr, "left and right expressions of range are not compatible"); 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 (+Expr, "left and right expressions of range are not compatible"); 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 Are_Types_Compatible (Expr_Type, A_Type) = Not_Compatible then Error_Msg_Sem (+Expr, "type of range doesn't match expected type"); 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 (Expr, Left); Set_Right_Limit_Expr (Expr, 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 then if Are_Types_Compatible (Expr_Type, A_Type) = Not_Compatible then Error_Msg_Sem (+Expr, "type of range doesn't match expected type"); return Null_Iir; end if; -- Use A_TYPE for the type of the expression. Expr_Type := A_Type; end if; Set_Type (Expr, Expr_Type); if Get_Kind (Expr_Type) not in Iir_Kinds_Scalar_Type_And_Subtype_Definition then Error_Msg_Sem (+Expr, "type of range is not a scalar type"); 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 analyzed 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 Is_Error (Res) 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 (+Expr, "name must denote a range"); return Null_Iir; end case; if A_Type /= Null_Iir and then Get_Base_Type (Res_Type) /= Get_Base_Type (A_Type) then Error_Not_Match (Expr, A_Type); return Null_Iir; end if; when others => Error_Msg_Sem (+Expr, "range expression required"); return Null_Iir; end case; if Get_Kind (Res_Type) not in Iir_Kinds_Scalar_Type_And_Subtype_Definition then Error_Msg_Sem (+Expr, "%n is not a range type", +Res); 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 (Are_Types_Compatible (A_Type, Get_Type_Of_Subtype_Indication (Res)) = Not_Compatible) then -- A_TYPE is known when analyzing an index_constraint within -- a subtype indication. Error_Msg_Sem (+Expr, "subtype %n doesn't match expected type %n", (+Res, +A_Type)); -- 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 (+Res, "range is not discrete"); else Error_Msg_Sem (+Expr, "%n is not a discrete range type", +Res); 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 or else Flag_Relaxed_Rules then null; elsif Vhdl_Std /= Vhdl_93 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 (Warnid_Universal, +Res, "universal integer bound must be numeric literal " & "or attribute"); else Error_Msg_Sem (+Res, "universal integer bound must be numeric " & "literal or attribute"); 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_By_Expression 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; -- Staticness. case Get_Kind (Imp) is when Iir_Kind_Function_Declaration => case Get_Implicit_Definition (Imp) is when Iir_Predefined_Error => raise Internal_Error; when Iir_Predefined_Pure_Functions => null; when Iir_Predefined_Impure_Functions => -- Predefined functions such as Now, Endfile are not static. Staticness := None; when Iir_Predefined_Explicit => if Get_Pure_Flag (Imp) then Staticness := Min (Staticness, Globally); else Staticness := None; end if; end case; when Iir_Kind_Interface_Function_Declaration => Staticness := None; when others => Error_Kind ("set_function_call_staticness", 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 | Iir_Kind_Interface_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 (Semantic, 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 : constant Iir := Get_Subprogram_Body (Callee); Subprg_Body : constant Iir := Get_Subprogram_Body (Subprg); begin -- 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 (Semantic, Subprg, Callee, Loc); else if Depth < Get_Subprogram_Depth (Subprg) then Error_Pure (Semantic, 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 Iir_Kind_Interface_Procedure_Declaration => -- We have no idea about this procedure. null; 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 (+Loc, "%n must not contain wait statement, but calls", (1 => +Subprg), Cont => True); Error_Msg_Sem (+Callee, "%n 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 Iir_Kind_Interface_Function_Declaration | Iir_Kind_Interface_Procedure_Declaration => -- FIXME: how to compute sensitivity ? Recurse ? return; 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 (+Loc, "all-sensitized %n can't call %n", (+Subprg, +Callee), Cont => True); Error_Msg_Sem (+Loc, " (as this subprogram reads (indirectly) a signal)"); 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); Sem_Decls.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; if Is_Implicit_Subprogram (Imp) then -- FIXME: impure predefined functions. null; else Sem_Call_Purity_Check (Subprg, Imp, Expr); Sem_Call_All_Sensitized_Check (Subprg, Imp, Expr); if Get_Kind (Imp) = Iir_Kind_Procedure_Declaration then Sem_Call_Wait_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 (+Expr, "%n is passive, but calls non-passive %n", (+Subprg, +Imp)); end if; when others => null; end case; end if; end if; end if; 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; A_Func: Iir; Imp_List: Iir_List; New_List : Iir_List; Assoc_Chain: Iir; Inter_Chain : Iir; Res_Type: Iir_List; Imp_It : List_Iterator; Inter: Iir; Match : Compatibility_Level; Match_Max : Compatibility_Level; 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. Imp := Get_Implementation (Expr); Imp_List := Get_Overload_List (Imp); Assoc_Chain := Get_Parameter_Association_Chain (Expr); Match_Max := Via_Conversion; New_List := Create_Iir_List; Imp_It := List_Iterate (Imp_List); while Is_Valid (Imp_It) loop A_Func := Get_Element (Imp_It); case Get_Kind (A_Func) is when Iir_Kinds_Functions_And_Literals | Iir_Kind_Interface_Function_Declaration => 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_Kind_Procedure_Declaration | Iir_Kind_Interface_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)) /= Not_Compatible) then Sem_Association_Chain (Get_Interface_Declaration_Chain (A_Func), Assoc_Chain, False, Missing_Parameter, Expr, Match); if Match >= Match_Max then -- Only previous interpretations were only Via_Conversion -- compatible, and this one is fully compatible, discard -- previous and future Via_Conversion interpretations. if Match > Match_Max then Destroy_Iir_List (New_List); New_List := Create_Iir_List; Match_Max := Match; end if; Append_Element (New_List, A_Func); end if; end if; << Continue >> null; Next (Imp_It); end loop; Destroy_Iir_List (Imp_List); Imp_List := New_List; Set_Overload_List (Imp, Imp_List); -- 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 Get_Nbr_Elements (Imp_List) is when 0 => -- FIXME: display subprogram name. Error_Msg_Sem (+Expr, "cannot resolve overloading for subprogram call"); 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); pragma Assert (Match /= Not_Compatible); 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; Imp_It := List_Iterate (Imp_List); while Is_Valid (Imp_It) loop Add_Element (Res_Type, Get_Return_Type (Get_Element (Imp_It))); Next (Imp_It); 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 analyzed 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 : Compatibility_Level; Overload_List : Iir_List; Overload_It : List_Iterator; 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 not Is_Function_Declaration (Inter_List) then Error_Msg_Sem (+Expr, "name does not designate a function", Cont => True); Error_Msg_Sem (+Expr, "name is %n defined at %l", (+Inter_List, +Inter_List)); return Null_Iir; end if; else if not Is_Procedure_Declaration (Inter_List) then Error_Msg_Sem (+Expr, "name does not designate a procedure", Cont => True); Error_Msg_Sem (+Expr, "name is %n defined at %l", (+Inter_List, +Inter_List)); 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 Match = Not_Compatible 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. Overload_List := Get_Overload_List (Inter_List); Overload_It := List_Iterate (Overload_List); while Is_Valid (Overload_It) loop Inter := Get_Element (Overload_It); if Are_Basetypes_Compatible (A_Type, Get_Base_Type (Get_Return_Type (Inter))) /= Not_Compatible then if Res /= Null_Iir then Error_Overload (Expr); Disp_Overload_List (Overload_List, Expr); return Null_Iir; else Res := Inter; end if; end if; Next (Overload_It); end loop; else if Are_Basetypes_Compatible (A_Type, Get_Base_Type (Get_Return_Type (Inter_List))) /= Not_Compatible then Res := Inter_List; end if; end if; if Res = Null_Iir then Error_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 Match = Not_Compatible 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 -- Association_Element_By_Individual duplicates existing -- associations. if Get_Kind (Param) /= Iir_Kind_Association_Element_By_Individual then 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; 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 implements implicit type conversions rules. -- Cf Sem_Names.Extract_Call_Without_Implicit_Conversion -- -- The typical case is the use of comparison operator with literals or -- attributes, like: s'length = 0 function Get_Non_Implicit_Subprogram (List : Iir_List) return Iir is It : List_Iterator; 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; It := List_Iterate (List); while Is_Valid (It) loop El := Get_Element (It); -- Only comparison operators need this special handling. if Get_Base_Type (Get_Return_Type (El)) /= Boolean_Type_Definition then return Null_Iir; end if; if Is_Implicit_Subprogram (El) then Ref_Type := Get_Type (Get_Interface_Declaration_Chain (El)); if Ref_Type = Universal_Integer_Type_Definition or Ref_Type = Universal_Real_Type_Definition then -- There could be only one such subprogram. pragma Assert (Res = Null_Iir); Res := El; end if; end if; Next (It); 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; It : List_Iterator; Res : Iir; begin if Get_Nbr_Elements (List) /= 2 then return Null_Iir; end if; It := List_Iterate (List); Sub1 := Get_Element (It); Next (It); Sub2 := Get_Element (It); Next (It); pragma Assert (not Is_Valid (It)); -- One must be an implicit declaration, the other must be an explicit -- declaration. pragma Assert (Get_Kind (Sub1) = Iir_Kind_Function_Declaration); pragma Assert (Get_Kind (Sub2) = Iir_Kind_Function_Declaration); if Is_Implicit_Subprogram (Sub1) then if Is_Implicit_Subprogram (Sub2) then return Null_Iir; end if; Res := Sub2; else if not Is_Implicit_Subprogram (Sub2) then return Null_Iir; end if; Res := 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; It : List_Iterator; -- 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 (+Expr, "operator ""%i"" is overloaded", +Operator); 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. -- Analyze operands. -- FIXME: should try to analyze right operand even if analyze -- 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 ? pragma Assert (Is_Function_Declaration (Decl)); -- 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 Continue; end if; -- Check return type. if Res_Type /= Null_Iir and then (Are_Types_Compatible (Res_Type, Get_Return_Type (Decl)) = Not_Compatible) then goto Continue; 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 Continue; end if; -- Check operands. if Is_Expr_Compatible (Get_Type (Interface_Chain), Left) = Not_Compatible then goto Continue; end if; if Arity = 2 then if Is_Expr_Compatible (Get_Type (Get_Chain (Interface_Chain)), Right) = Not_Compatible then goto Continue; end if; end if; -- Match. Set_Seen_Flag (Decl, True); Append_Element (Overload_List, Decl); << Continue >> null; Interpretation := Get_Next_Interpretation (Interpretation); end loop; -- Clear seen_flags. It := List_Iterate (Overload_List); while Is_Valid (It) loop Set_Seen_Flag (Get_Element (It), False); Next (It); end loop; -- The list of possible implementations was computed. case Get_Nbr_Elements (Overload_List) is when 0 => if Get_Kind (Expr) = Iir_Kind_Implicit_Condition_Operator then -- TODO: display expression type. Error_Msg_Sem (+Expr, "cannot convert expression to boolean " & "(no ""??"" found)"); else Error_Msg_Sem (+Expr, "no function declarations for %n", +Expr); end if; 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 (+Expr, "(you may want to use the -fexplicit option)"); 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; It := List_Iterate (Overload_List); while Is_Valid (It) loop Decl := Get_Element (It); -- FIXME: wrong: compatibilty with return type and args. if Are_Types_Compatible (Get_Return_Type (Decl), Res_Type) /= Not_Compatible then if Full_Compat /= Null_Iir then Error_Operator_Overload (Overload_List); return Null_Iir; else Full_Compat := Decl; end if; end if; Next (It); end loop; Free_Iir (Overload); Overload := Get_Type (Expr); Free_Overload_List (Overload); return Set_Uniq_Interpretation (Full_Compat); end if; end Sem_Operator; -- Analyze 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 (Str : Iir; El_Type : Iir) return Natural is function Find_Literal (Etype : Iir_Enumeration_Type_Definition; C : Character) return Iir_Enumeration_Literal is Id : constant Name_Id := Name_Table.Get_Identifier (C); Inter : Name_Interpretation_Type; Decl : Iir; begin Inter := Get_Interpretation (Id); while Valid_Interpretation (Inter) loop Decl := Get_Non_Alias_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; -- LRM08 9.3 Operands -- The character literals corresponding to the graphic characters -- contained within a string literal or a bit string literal shall -- be visible at the place of the string literal. -- Character C is not visible... if Find_Name_In_Flist (Get_Enumeration_Literal_List (Etype), Id) = Null_Iir then -- ... because it is not defined. Error_Msg_Sem (+Str, "type %n does not define character %c", (+Etype, +C)); else -- ... because it is not visible. Error_Msg_Sem (+Str, "character %c of type %n is not visible", (+C, +Etype)); end if; return Null_Iir; end Find_Literal; type Characters_Pos is array (Character range <>) of Nat8; Len : constant Nat32 := Get_String_Length (Str); Id : constant String8_Id := Get_String8_Id (Str); El : Iir; Enum_Pos : Iir_Int32; Ch : Character; -- Create a cache of literals, to speed-up a little bit the -- search. No_Pos : constant Nat8 := Nat8'Last; Map : Characters_Pos (' ' .. Character'Last) := (others => No_Pos); Res : Nat8; begin for I in 1 .. Len loop Ch := Str_Table.Char_String8 (Id, I); if Ch not in Map'Range then -- Invalid character. pragma Assert (Flags.Flag_Force_Analysis); Res := 0; else Res := Map (Ch); if Res = No_Pos then El := Find_Literal (El_Type, Ch); if El = Null_Iir then Res := 0; else Enum_Pos := Get_Enum_Pos (El); Res := Nat8 (Enum_Pos); Map (Ch) := Res; end if; end if; end if; Str_Table.Set_Element_String8 (Id, I, Res); end loop; -- LRM08 9.4.2 Locally static primaries -- a) A literal of any type other than type TIME Set_Expr_Staticness (Str, 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 (+Lit, "string length does not match that of %n", +Index_Type); 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; procedure Count_Choices (Info : out Choice_Info_Type; Choice_Chain : Iir) is Choice : Iir; S : Iir_Staticness; begin Info := (Nbr_Choices => 0, Nbr_Alternatives => 0, Others_Choice => Null_Iir, Arr => null, Annex_Arr => null); Choice := Choice_Chain; while Is_Valid (Choice) loop case Iir_Kinds_Case_Choice (Get_Kind (Choice)) is when Iir_Kind_Choice_By_Expression => S := Get_Expr_Staticness (Get_Choice_Expression (Choice)); pragma Assert (S = Get_Choice_Staticness (Choice)); if S = Locally then Info.Nbr_Choices := Info.Nbr_Choices + 1; end if; when Iir_Kind_Choice_By_Range => S := Get_Expr_Staticness (Get_Choice_Range (Choice)); pragma Assert (S = Get_Choice_Staticness (Choice)); if S = Locally then Info.Nbr_Choices := Info.Nbr_Choices + 1; end if; when Iir_Kind_Choice_By_Others => Info.Others_Choice := Choice; end case; if not Get_Same_Alternative_Flag (Choice) then Info.Nbr_Alternatives := Info.Nbr_Alternatives + 1; end if; Choice := Get_Chain (Choice); end loop; end Count_Choices; procedure Fill_Choices_Array (Info : in out Choice_Info_Type; Choice_Chain : Iir) is Index : Natural; Choice : Iir; Expr : Iir; begin Info.Arr := new Iir_Array (1 .. Info.Nbr_Choices); -- Fill the array. Index := 0; Choice := Choice_Chain; while Choice /= Null_Iir loop case Iir_Kinds_Case_Choice (Get_Kind (Choice)) is when Iir_Kind_Choice_By_Expression => Expr := Get_Choice_Expression (Choice); when Iir_Kind_Choice_By_Range => Expr := Get_Choice_Range (Choice); when Iir_Kind_Choice_By_Others => Expr := Null_Iir; end case; if Is_Valid (Expr) and then Get_Expr_Staticness (Expr) = Locally then Index := Index + 1; Info.Arr (Index) := Choice; end if; Choice := Get_Chain (Choice); end loop; pragma Assert (Index = Info.Nbr_Choices); end Fill_Choices_Array; procedure Swap_Choice_Info (Info : Choice_Info_Type; From : Natural; To : Natural) is Tmp : Iir; begin Tmp := Info.Arr (To); Info.Arr (To) := Info.Arr (From); Info.Arr (From) := Tmp; if Info.Annex_Arr /= null then declare T : Int32; begin T := Info.Annex_Arr (To); Info.Annex_Arr (To) := Info.Annex_Arr (From); Info.Annex_Arr (From) := T; end; end if; end Swap_Choice_Info; procedure Sort_String_Choices (Info : in out Choice_Info_Type) is -- 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 (Info.Arr (Op1)), Get_Choice_Expression (Info.Arr (Op2))) = Compare_Lt; end Lt; procedure Swap (From : Natural; To : Natural) is begin Swap_Choice_Info (Info, From, To); end Swap; procedure Str_Heap_Sort is new Grt.Algos.Heap_Sort (Lt => Lt, Swap => Swap); begin Str_Heap_Sort (Info.Nbr_Choices); end Sort_String_Choices; procedure Sem_String_Choices_Range (Choice_Chain : Iir; Sel : Iir) is -- 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; -- True if length of a choice mismatches Has_Length_Error : Boolean := False; El : Iir; Info : Choice_Info_Type; procedure Sem_Simple_Choice (Choice : Iir) is Expr : Iir; Choice_Len : Iir_Int64; 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 (+Expr, "choice must be locally static expression"); Has_Length_Error := True; return; end if; Set_Choice_Staticness (Choice, Locally); Expr := Eval_Expr (Expr); Set_Choice_Expression (Choice, Expr); if Get_Kind (Expr) = Iir_Kind_Overflow_Literal then Error_Msg_Sem (+Expr, "bound error during evaluation of choice expression"); Has_Length_Error := True; return; end if; Choice_Len := Eval_Discrete_Type_Length (Get_String_Type_Bound_Type (Get_Type (Expr))); if Sel_Length = -1 then Sel_Length := Choice_Len; else if Choice_Len /= Sel_Length then Has_Length_Error := True; Error_Msg_Sem (+Expr, "incorrect length for the choice value"); return; end if; end if; end Sem_Simple_Choice; function Eq (Op1, Op2 : Natural) return Boolean is begin return Compare_String_Literals (Get_Choice_Expression (Info.Arr (Op1)), Get_Choice_Expression (Info.Arr (Op2))) = Compare_Eq; end Eq; 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 (+Sel, "expression must be discrete or one-dimension array subtype"); return; end if; if Get_Type_Staticness (Sel_Type) = Locally then Sel_Length := Eval_Discrete_Type_Length (Get_String_Type_Bound_Type (Sel_Type)); else -- LRM08 10.9 Case statement -- If the expression is of a one-dimensional character array type and -- is not described by either of the preceding two paragraphs, then -- the values of all of the choices, except the OTHERS choice, if -- present, shall be of the same length. if Flags.Vhdl_Std >= Vhdl_08 then Sel_Length := -1; else Error_Msg_Sem (+Sel, "array type must be locally static"); return; end if; -- Use the base type so that the subtype of the choices is computed. Sel_Type := Get_Base_Type (Sel_Type); end if; Sel_El_Type := Get_Element_Subtype (Sel_Type); Sel_El_Length := Eval_Discrete_Type_Length (Sel_El_Type); El := Choice_Chain; Info.Others_Choice := Null_Iir; 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 (+El, "range choice are not allowed for non-discrete type"); when Iir_Kind_Choice_By_Expression => Sem_Simple_Choice (El); when Iir_Kind_Choice_By_Others => if Info.Others_Choice /= Null_Iir then Error_Msg_Sem (+El, "duplicate others choice"); elsif Get_Chain (El) /= Null_Iir then Error_Msg_Sem (+El, "choice others must be the last alternative"); end if; Info.Others_Choice := El; 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, whether 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, fill it and sort Count_Choices (Info, Choice_Chain); Fill_Choices_Array (Info, Choice_Chain); Sort_String_Choices (Info); -- 2. Check for duplicate choices for I in 1 .. Info.Nbr_Choices - 1 loop if Eq (I, I + 1) then Error_Msg_Sem (+Info.Arr (I), "duplicate choice with choice at %l", +Info.Arr (I + 1)); exit; end if; end loop; -- 3. Free Arr Free (Info.Arr); -- Check for missing choice. -- Do not try to compute the expected number of choices as this can -- easily overflow. if Info.Others_Choice = Null_Iir then declare Nbr : Iir_Int64 := Iir_Int64 (Info.Nbr_Choices); begin for I in 1 .. Sel_Length loop Nbr := Nbr / Sel_El_Length; if Nbr = 0 then Error_Msg_Sem (+Choice_Chain, "missing choice(s)"); exit; end if; end loop; end; end if; end Sem_String_Choices_Range; -- 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_Assoc_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 => return Get_Low_Limit (Expr); when others => return Expr; end case; when others => Error_Kind ("get_assoc_low", Assoc); end case; end Get_Assoc_Low; function Get_Assoc_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 => return Get_High_Limit (Expr); when others => return Expr; end case; when others => Error_Kind ("get_assoc_high", Assoc); end case; end Get_Assoc_High; procedure Sort_Discrete_Choices (Info : in out Choice_Info_Type) is -- Compare two elements of ARR. -- Return true iff OP1 < OP2. function Lt (Op1, Op2 : Natural) return Boolean is begin return (Eval_Pos (Get_Assoc_Low (Info.Arr (Op1))) < Eval_Pos (Get_Assoc_Low (Info.Arr (Op2)))); end Lt; procedure Swap (From : Natural; To : Natural) is begin Swap_Choice_Info (Info, From, To); end Swap; procedure Disc_Heap_Sort is new Grt.Algos.Heap_Sort (Lt => Lt, Swap => Swap); begin Disc_Heap_Sort (Info.Nbr_Choices); end Sort_Discrete_Choices; procedure Sem_Check_Continuous_Choices (Choice_Chain : Iir; Choice_Type : Iir; Low : out Iir; High : out Iir; Loc : Location_Type; Is_Sub_Range : Boolean) is -- Nodes that can appear. Info : Choice_Info_Type; Type_Has_Bounds : Boolean; begin -- Set TYPE_HAS_BOUNDS case Get_Kind (Choice_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_check_continuous_choices(3)", Choice_Type); end case; -- Check the choices are within the bounds. if Type_Has_Bounds and then Get_Type_Staticness (Choice_Type) = Locally then declare Choice : Iir; Ok : Boolean; Has_Err : Boolean; Expr : Iir; begin Has_Err := False; Choice := Choice_Chain; while Choice /= Null_Iir loop Ok := True; case Iir_Kinds_Case_Choice (Get_Kind (Choice)) is when Iir_Kind_Choice_By_Expression => Expr := Get_Choice_Expression (Choice); if Get_Expr_Staticness (Expr) = Locally then Ok := Eval_Is_In_Bound (Expr, Choice_Type); end if; when Iir_Kind_Choice_By_Range => Expr := Get_Choice_Range (Choice); if Get_Expr_Staticness (Expr) = Locally then Ok := Eval_Is_Range_In_Bound (Expr, Choice_Type, True); end if; when Iir_Kind_Choice_By_Others => null; end case; if not Ok then Error_Msg_Sem (+Choice, "%n out of index range", +Expr); Has_Err := True; end if; Choice := Get_Chain (Choice); end loop; -- In case of error (value not in range), don't try to extract -- bounds or to sort values. if Has_Err then High := Null_Iir; Low := Null_Iir; return; end if; end; end if; -- Compute the number of elements and sort. Count_Choices (Info, Choice_Chain); Fill_Choices_Array (Info, Choice_Chain); Sort_Discrete_Choices (Info); for I in Info.Arr'Range loop Set_Choice_Order (Info.Arr (I), Int32 (I)); end loop; -- Set low and high bounds. if Info.Nbr_Choices > 0 then Low := Get_Assoc_Low (Info.Arr (Info.Arr'First)); High := Get_Assoc_High (Info.Arr (Info.Arr'Last)); 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 (+Loc, "no choice for " & Disp_Discrete (Bt, L)); else Error_Msg_Sem (+Loc, "no choices for " & Disp_Discrete (Bt, L) & " to " & Disp_Discrete (Bt, H)); end if; end Error_No_Choice; -- Lowest and highest bounds. Lb, Hb : Iir; Pos : Iir_Int64; Pos_Max : Iir_Int64; E_Pos : Iir_Int64; Choice : Iir; Need_Others : Boolean; Bt : constant Iir := Get_Base_Type (Choice_Type); begin if not Is_Sub_Range and then Get_Type_Staticness (Choice_Type) = Locally and then Type_Has_Bounds then Get_Low_High_Limit (Get_Range_Constraint (Choice_Type), Lb, Hb); else Lb := Low; Hb := High; end if; if Lb = Null_Iir or else Hb = Null_Iir then -- Return now in case of error. Free (Info.Arr); return; 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 (Info.Arr); return; end if; Need_Others := False; for I in Info.Arr'Range loop Choice := Info.Arr (I); E_Pos := Eval_Pos (Get_Assoc_Low (Choice)); if E_Pos > Pos_Max then -- Choice out of bound, already handled. Error_No_Choice (Bt, Pos, Pos_Max, Get_Location (Choice)); -- Avoid other errors. Pos := Pos_Max + 1; exit; end if; if Pos < E_Pos then Need_Others := True; if Info.Others_Choice = Null_Iir then Error_No_Choice (Bt, Pos, E_Pos - 1, Get_Location (Choice)); end if; elsif Pos > E_Pos then Need_Others := True; if Pos = E_Pos + 1 then Error_Msg_Sem (+Choice, "duplicate choice for " & Disp_Discrete (Bt, E_Pos)); else Error_Msg_Sem (+Choice, "duplicate choices for " & Disp_Discrete (Bt, E_Pos) & " to " & Disp_Discrete (Bt, Pos)); end if; end if; if Get_Kind (Choice) = Iir_Kind_Choice_By_Range then Pos := Eval_Pos (Get_Assoc_High (Choice)) + 1; else Pos := E_Pos + 1; end if; end loop; if Pos /= Pos_Max + 1 then Need_Others := True; if Info.Others_Choice = Null_Iir then Error_No_Choice (Bt, Pos, Pos_Max, Loc); end if; end if; if not Need_Others and then Info.Others_Choice /= Null_Iir then Warning_Msg_Sem (Warnid_Others, +Info.Others_Choice, "redundant 'others' choices"); end if; end; -- LRM93 7.3.2.2 Array aggregates -- An others choice is locally static if the applicable index constraint -- if locally static. if Info.Nbr_Choices > 0 and then Info.Others_Choice /= Null_Iir and then Get_Type_Staticness (Choice_Type) /= Locally then Warning_Msg_Sem (Warnid_Static, +Info.Others_Choice, "'others' choice allowed only if the index constraint is static"); end if; Free (Info.Arr); end Sem_Check_Continuous_Choices; procedure Sem_Choices_Range (Choice_Chain : in out Iir; Choice_Type : Iir; Low : out Iir; High : out Iir; Loc : Location_Type; Is_Sub_Range : Boolean; Is_Case_Stmt : Boolean) 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; 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 Are_Types_Compatible (Range_Type, Choice_Type) = Not_Compatible then Error_Not_Match (Name, Choice_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)); Set_Element_Type_Flag (N_Choice, Get_Element_Type_Flag (El)); 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; -- Analyze 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, Choice_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 (Choice_Type)); end case; when others => Expr := Sem_Expression_Ov (Expr, Get_Base_Type (Choice_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; begin Low := Null_Iir; High := Null_Iir; -- First: -- Analyze 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 (+El, "choice is not locally static"); 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 (+El, "duplicate others choice"); elsif Get_Chain (El) /= Null_Iir then Error_Msg_Sem (+El, "choice others should be the last alternative"); 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 (+Loc, "element associations must be all positional or all named"); 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 (Choice_Type) /= Locally then return; end if; Pos_Max := Eval_Discrete_Type_Length (Choice_Type); if (not Has_Others and not Is_Sub_Range) and then Nbr_Pos < Pos_Max then Error_Msg_Sem (+Loc, "not enough elements associated"); elsif Nbr_Pos > Pos_Max then Error_Msg_Sem (+Loc, "too many elements associated"); 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 (+Loc, "not static choice exclude others choice"); end if; end if; return; end if; Sem_Check_Continuous_Choices (Choice_Chain, Choice_Type, Low, High, Loc, Is_Sub_Range); end Sem_Choices_Range; -- 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 El_List : constant Iir_Flist := Get_Elements_Declaration_List (A_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 (+El, "%n was already associated", +Matches (Pos)); 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 Are_Types_Compatible (El_Type, Ass_Type) = Not_Compatible then Error_Msg_Sem (+El, "elements are not of the same type"); Ok := False; end if; end Add_Match; -- Analyze 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 Expr : constant Iir := Get_Choice_Expression (Ass); N_El : Iir; Aggr_El : Iir_Element_Declaration; begin if Get_Kind (Expr) /= Iir_Kind_Simple_Name then Error_Msg_Sem (+Ass, "element association must be a simple name"); Ok := False; return Ass; end if; Aggr_El := Find_Name_In_Flist (El_List, Get_Identifier (Expr)); if Aggr_El = Null_Iir then Error_Msg_Sem (+Ass, "record has no such element %n", +Ass); Ok := False; return Ass; end if; Set_Named_Entity (Expr, Aggr_El); Xref_Ref (Expr, Aggr_El); -- Was a choice_by_expression, now by_name. N_El := Create_Iir (Iir_Kind_Choice_By_Name); Location_Copy (N_El, Ass); Set_Choice_Name (N_El, Expr); 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)); Free_Iir (Ass); 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; Expr_Staticness : Iir_Staticness; -- True if at least one element constrains the subtype. For unbounded -- records. Add_Constraints : Boolean; begin -- Not yet handled. Set_Aggregate_Expand_Flag (Aggr, False); Ok := True; Assoc_Chain := Get_Association_Choices_Chain (Aggr); Matches := (others => Null_Iir); Expr_Staticness := Locally; Add_Constraints := False; 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 not Get_Same_Alternative_Flag (El) then pragma Assert (Expr /= Null_Iir); El_Type := Null_Iir; end if; case Get_Kind (El) is when Iir_Kind_Choice_By_None => if Has_Named then Error_Msg_Sem (+El, "positional association after named one"); Ok := False; elsif Rec_El_Index > Matches'Last then Error_Msg_Sem (+El, "too many elements"); 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 (+El, "choice others must be the last alternative"); 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 (+El, "no element for choice others"); Ok := False; end if; end; when others => Error_Kind ("sem_record_aggregate", El); end case; -- Analyze the expression associated. if not Get_Same_Alternative_Flag (El) then if El_Type /= Null_Iir then -- Analyze the expression only if the choice is correct. Expr := Sem_Expression (Expr, El_Type); if Expr /= Null_Iir then Set_Associated_Expr (El, Eval_Expr_If_Static (Expr)); Expr_Staticness := Min (Expr_Staticness, Get_Expr_Staticness (Expr)); if not Add_Constraints and then Is_Fully_Constrained_Type (Get_Type (Expr)) and then not Is_Fully_Constrained_Type (El_Type) then Add_Constraints := True; end if; else Ok := False; end if; else -- This case is not possible unless there is an error. pragma Assert (not Ok); null; 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 (+Aggr, "no value for %n", +Get_Nth_Element (El_List, I)); Ok := False; end if; end loop; Set_Expr_Staticness (Aggr, Min (Get_Expr_Staticness (Aggr), Expr_Staticness)); if Ok and Add_Constraints then declare Rec_Type : Iir; Rec_El_List : Iir_Flist; Rec_El : Iir; Rec_El_Type : Iir; New_Rec_El : Iir; Constraint : Iir_Constraint; Composite_Found : Boolean; Staticness : Iir_Staticness; begin Rec_Type := Sem_Types.Copy_Subtype_Indication (Get_Type (Aggr)); Rec_El_List := Get_Elements_Declaration_List (Rec_Type); Constraint := Fully_Constrained; Composite_Found := False; Staticness := Locally; for I in Flist_First .. Flist_Last (El_List) loop El := Matches (I); El_Type := Get_Type (Get_Associated_Expr (El)); Rec_El := Get_Nth_Element (Rec_El_List, I); Rec_El_Type := Get_Type (Rec_El); if Is_Fully_Constrained_Type (El_Type) and then not Is_Fully_Constrained_Type (Rec_El_Type) then Rec_El_Type := El_Type; New_Rec_El := Create_Iir (Iir_Kind_Record_Element_Constraint); Location_Copy (New_Rec_El, Rec_El); Set_Parent (New_Rec_El, Rec_Type); Set_Identifier (New_Rec_El, Get_Identifier (Rec_El)); pragma Assert (I = Natural (Get_Element_Position (Rec_El))); Set_Element_Position (New_Rec_El, Iir_Index32 (I)); Set_Nth_Element (Rec_El_List, I, New_Rec_El); Set_Type (New_Rec_El, Rec_El_Type); Append_Owned_Element_Constraint (Rec_Type, New_Rec_El); end if; Staticness := Min (Staticness, Get_Type_Staticness (Rec_El_Type)); Sem_Types.Update_Record_Constraint (Constraint, Composite_Found, Rec_El_Type); end loop; Set_Type_Staticness (Rec_Type, Staticness); Set_Constraint_State (Rec_Type, Constraint); Set_Type (Aggr, Rec_Type); Set_Literal_Subtype (Aggr, Rec_Type); end; end if; 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; -- 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; -- Number of associations in last-level (not for sub-aggregate). This -- is used only to decide whether or not a static aggregate can be -- expanded. Nbr_Assocs : Natural := 0; -- True if there is an error. Error : Boolean := False; -- True if one element doesn't match the bounds. Has_Bound_Error : Boolean := False; end record; type Array_Aggr_Info_Arr is array (Natural range <>) of Array_Aggr_Info; procedure Sem_Array_Aggregate_Elements (Aggr : Iir; A_Type : Iir; Expr_Staticness : in out Iir_Staticness; Info : in out Array_Aggr_Info) is Element_Type : constant Iir := Get_Element_Subtype (A_Type); El : Iir; El_Expr : Iir; Expr : Iir; El_Staticness : Iir_Staticness; Assoc_Chain : Iir; Res_Type : Iir; -- True if the type of the expression is the type of the aggregate. Is_Array : Boolean; -- Null_Iir if the type of aggregagte elements myst be of the element -- type. Elements_Types : Iir; Elements_Types_List : Iir_List; begin -- LRM93 7.3.2.2 Array aggregates -- [...] the expression of each element association must be of the -- element type. -- LRM08 9.3.3.3 Array aggregates -- For an aggregate of a one-dimensional array type, [each choice shall -- specify values of the index type], and the expression of each element -- association shall be of either the element type or the type of the -- aggregate. if Flags.Vhdl_Std >= Vhdl_08 and then Is_One_Dimensional_Array_Type (A_Type) then Elements_Types_List := Create_Iir_List; Append_Element (Elements_Types_List, Element_Type); Append_Element (Elements_Types_List, Get_Base_Type (A_Type)); Elements_Types := Create_Overload_List (Elements_Types_List); else Elements_Types := Null_Iir; end if; Assoc_Chain := Get_Association_Choices_Chain (Aggr); El := Assoc_Chain; while El /= Null_Iir loop if not Get_Same_Alternative_Flag (El) then El_Expr := Get_Associated_Expr (El); Is_Array := False; -- Directly analyze the expression with the type of the element -- if it cannot be the type of the aggregate. -- In VHDL-2008, also do it when the expression is an aggregate. -- This is not in the LRM, but otherwise this would create a lot -- of ambiguities when the element type is a composite type. Eg: -- -- type time_unit is record -- val : time; -- name : string (1 to 3); -- end record; -- type time_names_type is array (1 to 2) of time_unit; -- constant time_names : time_names_type := -- ((fs, "fs "), (ps, "ps ")); -- -- The type of the first sub-aggregate could be either time_unit -- or time_names_type. Because it's determined by the context, -- it is ambiguous. But there is no point in using aggregates -- to specify a range of choices. -- FIXME: fix LRM ? if Elements_Types = Null_Iir or else Get_Kind (El_Expr) = Iir_Kind_Aggregate then Expr := Sem_Expression (El_Expr, Element_Type); else Expr := Sem_Expression_Wildcard (El_Expr, Null_Iir); if Expr /= Null_Iir then Res_Type := Compatible_Types_Intersect (Get_Type (Expr), Elements_Types); if Res_Type = Null_Iir then Error_Msg_Sem (+Get_Associated_Expr (El), "type of element not compatible with the " & "expected type"); Set_Type (El_Expr, Error_Type); Expr := Null_Iir; elsif Is_Overload_List (Res_Type) then Error_Msg_Sem (+Expr, "type of element is ambiguous"); Free_Overload_List (Res_Type); Set_Type (El_Expr, Error_Type); Expr := Null_Iir; else pragma Assert (Is_Defined_Type (Res_Type)); Is_Array := Get_Base_Type (Res_Type) = Get_Base_Type (A_Type); Expr := Sem_Expression_Wildcard (Expr, Res_Type); end if; end if; end if; if Expr /= Null_Iir then El_Staticness := Get_Expr_Staticness (Expr); Expr := Eval_Expr_If_Static (Expr); Set_Associated_Expr (El, Expr); if not Is_Static_Construct (Expr) then Set_Aggregate_Expand_Flag (Aggr, False); end if; if not Is_Array and then not Eval_Is_In_Bound (Expr, Element_Type) then Info.Has_Bound_Error := True; Warning_Msg_Sem (Warnid_Runtime_Error, +Expr, "element is out of the bounds"); end if; Expr_Staticness := Min (Expr_Staticness, El_Staticness); Info.Nbr_Assocs := Info.Nbr_Assocs + 1; else Info.Error := True; end if; end if; Set_Element_Type_Flag (El, not Is_Array); if Is_Array then -- LRM08 9.3.3.3 Array aggregates -- If the type of the expression of an element association -- is the type of the aggregate, then either the element -- association shall be positional or the choice shall be -- a discrete range. -- GHDL: must be checked for all associations, so do it outside -- the above 'if' statement. -- GHDL: improve error message. case Get_Kind (El) is when Iir_Kind_Choice_By_None | Iir_Kind_Choice_By_Range => null; when Iir_Kind_Choice_By_Others => Error_Msg_Sem (+El, "expression for 'others' must be an element"); when others => Error_Msg_Sem (+El, "positional association or " & "discrete range choice required"); end case; end if; El := Get_Chain (El); end loop; if Elements_Types /= Null_Iir then Free_Overload_List (Elements_Types); end if; end Sem_Array_Aggregate_Elements; -- Analyze 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_1 (Aggr: Iir; A_Type: Iir; Infos : in out Array_Aggr_Info_Arr; Constrained : Boolean; Dim: Natural) is Index_List : constant Iir_Flist := Get_Index_Subtype_List (A_Type); -- Type of the index (this is also the type of the choices). Index_Type : constant Iir := Get_Index_Type (Index_List, Dim - 1); Assoc_Chain : Iir; Choice: Iir; Is_Positional: Tri_State_Type; Has_Positional_Choice: Boolean; Low, High : Iir; Has_Others : Boolean; Len : Natural; Index_Subtype_Constraint : Iir_Range_Expression; Index_Constraint : Iir_Range_Expression; -- FIXME: 'range. Dir : Iir_Direction; Choice_Staticness : Iir_Staticness; Len_Staticness : Iir_Staticness; Expr_Staticness : Iir_Staticness; Info : Array_Aggr_Info renames Infos (Dim); begin -- Analyze aggregate elements. if Constrained then Expr_Staticness := Get_Type_Staticness (Index_Type); if Expr_Staticness /= Locally then -- Cannot be statically built as the bounds are not known and -- must be checked at run-time. Set_Aggregate_Expand_Flag (Aggr, False); end if; else Expr_Staticness := Locally; end if; if Dim = Get_Nbr_Elements (Index_List) then -- A type has been found for AGGR, analyze AGGR as if it was -- an aggregate with a subtype (and not a string). if Get_Kind (Aggr) = Iir_Kind_Aggregate then Sem_Array_Aggregate_Elements (Aggr, A_Type, Expr_Staticness, Info); else -- Nothing to do for a string. null; end if; else -- A sub-aggregate: recurse. declare Sub_Aggr : Iir; begin -- Here we know that AGGR is an aggregate because: -- * either this is the first call (ie DIM = 1) and therefore -- AGGR is an aggregate (an aggregate is being analyzed). -- * or DIM > 1 and the use of strings is checked (just bellow). Assoc_Chain := Get_Association_Choices_Chain (Aggr); Choice := Assoc_Chain; while Choice /= Null_Iir loop if not Get_Same_Alternative_Flag (Choice) then Sub_Aggr := Get_Associated_Expr (Choice); case Get_Kind (Sub_Aggr) is when Iir_Kind_Aggregate => Sem_Array_Aggregate_1 (Sub_Aggr, A_Type, Infos, Constrained, Dim + 1); if not Get_Aggregate_Expand_Flag (Sub_Aggr) then Set_Aggregate_Expand_Flag (Aggr, False); end if; when Iir_Kind_String_Literal8 => if Dim + 1 = Get_Nbr_Elements (Index_List) then Sem_Array_Aggregate_1 (Sub_Aggr, A_Type, Infos, Constrained, Dim + 1); else Error_Msg_Sem (+Sub_Aggr, "string literal not allowed here"); Infos (Dim + 1).Error := True; end if; when others => Error_Msg_Sem (+Sub_Aggr, "sub-aggregate expected"); Infos (Dim + 1).Error := True; end case; end if; -- Always true for a sub-aggregate. Set_Element_Type_Flag (Choice, True); Choice := Get_Chain (Choice); end loop; end; end if; Set_Expr_Staticness (Aggr, Min (Expr_Staticness, Get_Expr_Staticness (Aggr))); -- Analyze choices. Len_Staticness := Locally; case Get_Kind (Aggr) is when Iir_Kind_Aggregate => Assoc_Chain := Get_Association_Choices_Chain (Aggr); Sem_Choices_Range (Assoc_Chain, Index_Type, Low, High, Get_Location (Aggr), not Constrained, False); 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; if Get_Element_Type_Flag (Choice) then Len := Len + 1; else -- Extract length from associated expression. declare -- Always has an associated expr, as not named. Expr : constant Iir := Get_Associated_Expr (Choice); Expr_Type : constant Iir := Get_Type (Expr); Expr_Index : Iir; Index_Staticness : Iir_Staticness; begin if not Is_Error (Expr_Type) then Expr_Index := Get_Index_Type (Expr_Type, 0); Index_Staticness := Get_Type_Staticness (Expr_Index); case Index_Staticness is when Locally => Len := Len + Natural (Eval_Discrete_Type_Length (Expr_Index)); when Globally | None => Len_Staticness := Iirs.Min (Len_Staticness, Index_Staticness); when Unknown => -- Must have been caught by Is_Error. raise Internal_Error; end case; end if; end; end if; when Iir_Kind_Choice_By_Others => if not Constrained then Error_Msg_Sem (+Aggr, "'others' choice not allowed " & "for an aggregate in this context"); Infos (Dim).Error := True; return; end if; Has_Others := True; when others => Error_Kind ("sem_array_aggregate", 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_Literal8 => 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; Info.Nbr_Assocs := Info.Nbr_Assocs + Len; when others => Error_Kind ("sem_array_aggregate(1)", Aggr); end case; 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 (+Aggr, "non-locally static choice for an aggregate " & "is allowed only if only choice"); Infos (Dim).Error := True; return; end if; Info.Has_Dynamic := True; Set_Aggregate_Expand_Flag (Aggr, False); 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 and then Len_Staticness = 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 (Iir_Kind_Integer_Subtype_Definition); 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(2)", 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); Set_Type (Index_Subtype_Constraint, Index_Type); if Get_Kind (Index_Constraint) = Iir_Kind_Range_Expression then Dir := Get_Direction (Index_Constraint); else -- This is not correct, as the direction must be the one of -- the corresponding constraint. But it may not be determined -- at analysis time (if 'Range), and it doesn't really matter -- because of implicit subtype conversion. So choose one -- arbitrary direction. Dir := Iir_To; end if; -- 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, Dir); case Dir 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. Set_Aggregate_Expand_Flag (Aggr, False); declare -- There is only one choice. Choice : constant Iir := Assoc_Chain; Expr : Iir; begin case Get_Kind (Choice) is when Iir_Kind_Choice_By_Expression => Expr := Get_Choice_Expression (Choice); Set_Direction (Index_Subtype_Constraint, Dir); 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); Set_Is_Ref (Info.Index_Subtype, True); -- 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 (+Aggr, "subaggregate bounds mismatch"); else if Eval_Discrete_Type_Length (Info.Index_Subtype) /= Iir_Int64 (Len) then Error_Msg_Sem (+Aggr, "subaggregate length mismatch"); 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 (+Aggr, "subagregate bounds mismatch"); end if; end; end if; end if; Expr_Staticness := Min (Get_Expr_Staticness (Aggr), Choice_Staticness); Set_Expr_Staticness (Aggr, Expr_Staticness); end Sem_Array_Aggregate_1; -- Analyze 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 (Aggr : Iir; Aggr_Type : Iir; Constrained : Boolean) return Iir is A_Subtype: Iir; Base_Type : Iir; Index_List : constant Iir_Flist := 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; Type_Staticness : Iir_Staticness; begin -- By default, consider the aggregate can be statically built. Set_Aggregate_Expand_Flag (Aggr, True); -- Analyze the aggregate. Sem_Array_Aggregate_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 Set_Aggregate_Expand_Flag (Aggr, False); 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); -- Reuse AGGR_TYPE iff AGGR_TYPE is fully constrained -- and statically match the subtype of the aggregate. if Aggr_Constrained then Type_Staticness := Locally; for I in Infos'Range loop Type_Staticness := Min (Type_Staticness, Get_Type_Staticness (Infos (I).Index_Subtype)); end loop; if Get_Constraint_State (Aggr_Type) = Fully_Constrained and then Get_Type_Staticness (Aggr_Type) = Locally and then Type_Staticness = Locally then Set_Type (Aggr, Aggr_Type); else A_Subtype := Create_Array_Subtype (Base_Type, Get_Location (Aggr)); -- FIXME: extract element subtype ? Set_Element_Subtype (A_Subtype, Get_Element_Subtype (Aggr_Type)); Type_Staticness := Min (Type_Staticness, Get_Type_Staticness (A_Subtype)); for I in Infos'Range loop Set_Nth_Element (Get_Index_Subtype_List (A_Subtype), I - 1, Infos (I).Index_Subtype); end loop; Set_Type_Staticness (A_Subtype, Type_Staticness); Set_Index_Constraint_Flag (A_Subtype, True); -- FIXME: the element can be unconstrained. Set_Constraint_State (A_Subtype, Fully_Constrained); Set_Type (Aggr, A_Subtype); Set_Literal_Subtype (Aggr, A_Subtype); end if; if Type_Staticness = Locally and then Get_Aggregate_Expand_Flag (Aggr) then -- Compute ratio of elements vs size of the aggregate to determine -- if the aggregate can be expanded. declare Size : Iir_Int64; begin Size := 1; for I in Infos'Range loop Size := Size * Eval_Discrete_Type_Length (Infos (I).Index_Subtype); end loop; Set_Aggregate_Expand_Flag (Aggr, Infos (Nbr_Dim).Nbr_Assocs >= Natural (Size / 10)); end; else Set_Aggregate_Expand_Flag (Aggr, False); end if; else -- Free unused indexes subtype. for I in Infos'Range loop declare St : constant Iir := Infos (I).Index_Subtype; Rng : Iir; begin if St /= Null_Iir then Rng := Get_Range_Constraint (St); Free_Iir (Get_Right_Limit_Expr (Rng)); Free_Iir (Rng); Free_Iir (St); end if; end; end loop; -- If bounds are not known, the aggregate cannot be statically built. Set_Aggregate_Expand_Flag (Aggr, False); end if; if Infos (Nbr_Dim).Has_Bound_Error then return Build_Overflow (Aggr, Get_Type (Aggr)); 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; -- Analyze aggregate EXPR whose type is expected to be A_TYPE. -- A_TYPE cannot be null_iir (this case is handled in sem_expression_ov) -- If FORCE_CONSTRAINED is true, the aggregate type is constrained by the -- context, even if its type isn't. This is to deal with cases like: -- procedure set (v : out string) is -- begin -- v := (others => ' '); -- end set; -- but this is not allowed by: -- LRM08 9.3.3.3 Array aggregates -- e) As a value expression in an assignment statement, where the target -- is a declared object (or member thereof), and either the subtype of -- the target is a fully constrained array subtype or the target is a -- slice name. function Sem_Aggregate (Expr: Iir_Aggregate; A_Type: Iir; Force_Constrained : Boolean) return Iir_Aggregate is Force_Constrained2 : constant Boolean := Force_Constrained and Flag_Relaxed_Rules; begin pragma Assert (A_Type /= Null_Iir); if Flags.Vhdl_Std >= Vhdl_08 then -- An aggregate can be a locally static primary according to LRM08 -- 9.4.2 Locally static primaries l) and m). Set_Expr_Staticness (Expr, Locally); else -- An aggregate is at most globally static. Set_Expr_Staticness (Expr, Globally); end if; 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 (Expr, A_Type, Force_Constrained2 or else Get_Index_Constraint_Flag (A_Type)); when Iir_Kind_Array_Type_Definition => return Sem_Array_Aggregate (Expr, A_Type, Force_Constrained2); 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 Iir_Kind_Error => return Null_Iir; when others => Error_Msg_Sem (+Expr, "type %n is not composite", +A_Type); return Null_Iir; end case; end Sem_Aggregate; function Is_Physical_Literal_Zero (Lit : Iir) return Boolean is begin case Iir_Kinds_Physical_Literal (Get_Kind (Lit)) is when Iir_Kind_Physical_Int_Literal => return Get_Value (Lit) = 0; when Iir_Kind_Physical_Fp_Literal => return Get_Fp_Value (Lit) = 0.0; end case; end Is_Physical_Literal_Zero; -- Transform LIT into a physical_literal. -- LIT can be either a not analyzed 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 : 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_Kinds_Denoting_Name => Res := Create_Iir (Iir_Kind_Physical_Int_Literal); Location_Copy (Res, Lit); Set_Value (Res, 1); Set_Literal_Origin (Res, Lit); Unit_Name := Lit; when others => Error_Kind ("sem_physical_literal", Lit); end case; if Is_Error (Unit_Name) then return Create_Error_Expr (Res, Error_Mark); end if; Unit_Name := Sem_Denoting_Name (Unit_Name); Unit := Get_Named_Entity (Unit_Name); if Get_Kind (Unit) /= Iir_Kind_Unit_Declaration then if not Is_Error (Unit) then Error_Class_Match (Unit_Name, "unit"); end if; Set_Named_Entity (Unit_Name, Create_Error_Name (Unit_Name)); else -- Physical unit is used. Set_Use_Flag (Unit, True); if Get_Type (Unit) = Time_Type_Definition and then Get_Value (Get_Physical_Literal (Unit)) = 0 and then not Is_Physical_Literal_Zero (Res) then -- LRM08 5.2.4.2 Predefined physical types -- It is an error if a given unit of type TIME appears anywhere -- within the design hierarchy defining a model to be elaborated, -- and if the position number of that unit is less than that of -- the secondary unit selected as the resolution limit for type -- TIME during the elaboration of the model, unless that unit is -- part of a physical literal whose abstract literal is either -- the integer value zero or the floating-point value zero. Error_Msg_Sem (+Res, "physical unit %i is below the time resolution", +Unit); end if; end if; Set_Unit_Name (Res, Unit_Name); Set_Physical_Unit (Res, Get_Named_Entity (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; -- Analyze 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 => -- Analyze subtype indication. 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 or else Is_Error (Arg) then return Null_Iir; end if; if Is_Anonymous_Type_Definition (Arg) then Set_Allocator_Subtype (Expr, Get_Subtype_Indication (Expr)); 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 (+Expr, "allocator of unconstrained %n is not allowed", +Arg); 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_Kind (Arg) /= Iir_Kind_Access_Subtype_Definition and then Get_Resolution_Indication (Arg) /= Null_Iir then Error_Msg_Sem (+Expr, "subtype indication must not include" & " a resolution function"); 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 (+Expr, "expected type is not an access type"); end if; else Error_Not_Match (Expr, A_Type); end if; return Null_Iir; end if; Set_Type (Expr, A_Type); return Expr; end if; end Sem_Allocator; function Sem_Qualified_Expression (Expr : Iir; A_Type : Iir) return Iir is 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 Are_Types_Compatible (A_Type, N_Type) = Not_Compatible then Error_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); -- LRM93 7.4.1 Locally static primaries -- h) A qualified expression whose operand is a locally static -- expression. -- -- LRM08 9.4.2 Locally static primaries -- i) A qualified expression whose type mark denotes a locally static -- subtype and whose operand is a locally static expression. -- -- We always use the vhdl08, because it is weird to have locally -- static expression with a non-locally static subtype. Set_Expr_Staticness (Expr, Min (Get_Expr_Staticness (Res), Get_Type_Staticness (N_Type))); -- When possible, use the type of the expression as the type of the -- qualified expression. -- TODO: also handle unbounded subtypes, but only if this is a proper -- subtype. case Get_Kind (N_Type) is when Iir_Kind_Array_Type_Definition | Iir_Kind_Record_Type_Definition => Set_Type (Expr, Get_Type (Res)); when others => null; end case; return Expr; end Sem_Qualified_Expression; function Is_Signal_Parameter (Obj : Iir) return Boolean is begin return Get_Kind (Obj) = Iir_Kind_Interface_Signal_Declaration and then Get_Kind (Get_Parent (Obj)) in Iir_Kinds_Subprogram_Declaration; end Is_Signal_Parameter; function Can_Interface_Be_Read (Inter : Iir) return Boolean is begin case Get_Mode (Inter) is when Iir_In_Mode | Iir_Inout_Mode | Iir_Buffer_Mode => -- LRM08 6.5.3 Interface object declarations -- - in. The value of the interface object is allowed -- to be read, [...] -- - inout or buffer. Reading and updating the value of -- the interface object is allowed. [...] null; when Iir_Out_Mode => -- LRM93 4.3.2 Interface declarations -- - out. The value of the interface object is allowed to be -- updated, but it must not be read. -- -- LRM08 6.5.3 Interface object declarations -- - out. The value of the interface object is allowed -- [to be updated and,] provided it is not a signal -- parameter, read. if Vhdl_Std < Vhdl_08 or else Is_Signal_Parameter (Inter) then return False; end if; when Iir_Linkage_Mode => -- LRM08 6.5.3 Interface object declarations -- - linkage. Reading and updating the value of the -- interface object is allowed, but only by appearing -- as an actual corresponding to an interface object -- of mode LINKAGE. No other reading or updating is -- permitted. return False; when Iir_Unknown_Mode => raise Internal_Error; end case; return True; end Can_Interface_Be_Read; function Can_Interface_Be_Updated (Inter : Iir) return Boolean is begin case Get_Mode (Inter) is when Iir_In_Mode => -- LRM08 6.5.3 Interface object declarations -- - in. The value of the interface object is allowed to be read, -- but it shall not be updated. return False; when Iir_Out_Mode => -- LRM08 6.5.3 Interface object declarations -- - out. The value of the interface object is allowed -- to be updated [and, ...] return True; when Iir_Inout_Mode | Iir_Buffer_Mode => -- LRM08 6.5.3 Interface object declarations -- - inout or buffer. Reading and updating the value of the -- interface is allowed. return True; when Iir_Linkage_Mode => -- LRM08 6.5.3 Interface object declarations -- - linkage. Reading and updating the value of the -- interface object is allowed, but only by appearing -- as an actual corresponding to an interface object -- of mode LINKAGE. No other reading or updating is -- permitted. return False; when Iir_Unknown_Mode => raise Internal_Error; end case; end Can_Interface_Be_Updated; 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_Kinds_External_Name => return; when Iir_Kind_Psl_Endpoint_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 => if not Can_Interface_Be_Read (Obj) then Error_Msg_Sem (+Expr, "%n cannot be read", +Obj); end if; return; when Iir_Kind_Enumeration_Literal | Iir_Kind_Physical_Int_Literal | Iir_Kind_Physical_Fp_Literal | Iir_Kind_String_Literal8 | 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); 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 (+Loc, "invalid use of a deferred constant"); 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 analyzed -- -- except to resolve overload. -- if Get_Type (Expr) /= Null_Iir then -- -- EXPR was already analyzed. -- 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); pragma Assert (E /= Null_Iir); 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_External_Name => Sem_External_Name (Expr); return Expr; 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 Are_Basetypes_Compatible (A_Type, Get_Base_Type (Get_Type (Expr))) = Not_Compatible then Error_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 Error_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 Error_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; Res_Type : Iir; begin Res := Sem_Physical_Literal (Expr); Res_Type := Get_Type (Res); if Is_Null (Res_Type) then return Null_Iir; end if; if A_Type /= Null_Iir and then Res_Type /= A_Type then Error_Not_Match (Res, A_Type); return Null_Iir; end if; return Res; end; when Iir_Kind_String_Literal8 => -- 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 Error_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 (+Expr, "null literal can only be access type"); 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, False); 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 => return Sem_Qualified_Expression (Expr, A_Type); when Iir_Kind_Allocator_By_Expression | Iir_Kind_Allocator_By_Subtype => return Sem_Allocator (Expr, A_Type); when Iir_Kind_Procedure_Declaration => Error_Msg_Sem (+Expr, "%n cannot be used as an expression", +Expr); return Null_Iir; when Iir_Kind_Range_Expression => -- Can only happen in case of parse error, as a range is not an -- expression. pragma Assert (Flags.Flag_Force_Analysis); declare Res : Iir; begin Res := Sem_Simple_Range_Expression (Expr, A_Type, True); return Create_Error_Expr (Res, A_Type); end; when Iir_Kind_Error => -- Always ok. return Expr; when others => Error_Kind ("sem_expression_ov", Expr); return Null_Iir; end case; end Sem_Expression_Ov; function Is_Expr_Not_Analyzed (Expr : Iir) return Boolean is begin return Get_Type (Expr) = Null_Iir; end Is_Expr_Not_Analyzed; function Is_Expr_Fully_Analyzed (Expr : Iir) return Boolean is begin return Is_Defined_Type (Get_Type (Expr)); end Is_Expr_Fully_Analyzed; function Get_Wildcard_Type (Wildcard : Iir; Atype : Iir) return Iir is begin if Atype in Iir_Wildcard_Types then -- Special wildcard vs wildcard. case Iir_Wildcard_Types (Wildcard) is when Wildcard_Any_Type => return Atype; when Wildcard_Any_Aggregate_Type => case Iir_Wildcard_Types (Atype) is when Wildcard_Any_Type | Wildcard_Any_Aggregate_Type => return Wildcard_Any_Aggregate_Type; when Wildcard_Any_String_Type => return Wildcard_Any_String_Type; when Wildcard_Any_Access_Type => return Null_Iir; end case; when Wildcard_Any_String_Type => case Iir_Wildcard_Types (Atype) is when Wildcard_Any_Type | Wildcard_Any_Aggregate_Type | Wildcard_Any_String_Type => return Wildcard_Any_String_Type; when Wildcard_Any_Access_Type => return Null_Iir; end case; when Wildcard_Any_Access_Type => case Iir_Wildcard_Types (Atype) is when Wildcard_Any_Type | Wildcard_Any_Access_Type => return Wildcard_Any_Access_Type; when Wildcard_Any_Aggregate_Type | Wildcard_Any_String_Type => return Null_Iir; end case; end case; else case Iir_Wildcard_Types (Wildcard) is when Wildcard_Any_Type => -- Match with any type. return Atype; when Wildcard_Any_Aggregate_Type => if Is_Aggregate_Type (Atype) then return Atype; end if; when Wildcard_Any_String_Type => if Is_String_Type (Atype) then return Atype; end if; when Wildcard_Any_Access_Type => if Get_Kind (Get_Base_Type (Atype)) = Iir_Kind_Access_Type_Definition then return Atype; end if; end case; return Null_Iir; end if; end Get_Wildcard_Type; function Compatible_Types_Intersect_Single (T1, T2 : Iir) return Iir is begin if T1 = T2 then return T1; end if; if T1 in Iir_Wildcard_Types then return Get_Wildcard_Type (T1, T2); elsif T2 in Iir_Wildcard_Types then return Get_Wildcard_Type (T2, T1); else return Get_Common_Basetype (Get_Base_Type (T1), Get_Base_Type (T2)); end if; end Compatible_Types_Intersect_Single; function Compatible_Types_Intersect_Single_List (A_Type, Types_List : Iir) return Iir is Types_List_List : Iir_List; It : List_Iterator; El: Iir; Com : Iir; Res : Iir; begin if not Is_Overload_List (Types_List) then return Compatible_Types_Intersect_Single (A_Type, Types_List); else Types_List_List := Get_Overload_List (Types_List); Res := Null_Iir; It := List_Iterate (Types_List_List); while Is_Valid (It) loop El := Get_Element (It); Com := Compatible_Types_Intersect_Single (El, A_Type); if Com /= Null_Iir then Add_Result (Res, Com); end if; Next (It); end loop; return Res; end if; end Compatible_Types_Intersect_Single_List; function Compatible_Types_Intersect (List1, List2 : Iir) return Iir is List1_List : Iir_List; It1 : List_Iterator; Res : Iir; El : Iir; Tmp : Iir; begin if List1 = Null_Iir or else List2 = Null_Iir then return Null_Iir; end if; if Is_Overload_List (List1) then List1_List := Get_Overload_List (List1); Res := Null_Iir; It1 := List_Iterate (List1_List); while Is_Valid (It1) loop El := Get_Element (It1); Tmp := Compatible_Types_Intersect_Single_List (El, List2); if Tmp /= Null_Iir then Add_Result (Res, Tmp); end if; Next (It1); end loop; return Res; else return Compatible_Types_Intersect_Single_List (List1, List2); end if; end Compatible_Types_Intersect; function Sem_Expression_Wildcard (Expr : Iir; Atype : Iir; Force_Constrained : Boolean := False) return Iir is Expr_Type : constant Iir := Get_Type (Expr); Atype_Defined : constant Boolean := Is_Defined_Type (Atype); Expr_Type_Defined : constant Boolean := Is_Defined_Type (Expr_Type); begin if Expr_Type /= Null_Iir then -- EXPR is at least partially analyzed. if Expr_Type_Defined or else not Atype_Defined then -- Nothing to do if: -- - Expression is already fully analyzed: caller has to merge -- types -- - Expression is partially analyzed but ATYPE is not defined: -- caller has to merge types. return Expr; end if; end if; case Get_Kind (Expr) is when Iir_Kind_Aggregate => if Atype_Defined then return Sem_Aggregate (Expr, Atype, Force_Constrained); else pragma Assert (Expr_Type = Null_Iir); Set_Type (Expr, Wildcard_Any_Aggregate_Type); end if; return Expr; when Iir_Kind_String_Literal8 => if Atype_Defined then if not Is_String_Literal_Type (Atype, Expr) then Error_Not_Match (Expr, Atype); Set_Type (Expr, Error_Type); else Set_Type (Expr, Atype); Sem_String_Literal (Expr); end if; else pragma Assert (Expr_Type = Null_Iir); Set_Type (Expr, Wildcard_Any_String_Type); end if; return Expr; when Iir_Kind_Null_Literal => if Atype_Defined then if not Is_Null_Literal_Type (Atype) then Error_Not_Match (Expr, Atype); Set_Type (Expr, Error_Type); else Set_Type (Expr, Atype); Set_Expr_Staticness (Expr, Locally); end if; else pragma Assert (Expr_Type = Null_Iir); Set_Type (Expr, Wildcard_Any_Access_Type); end if; return Expr; when Iir_Kind_Allocator_By_Expression | Iir_Kind_Allocator_By_Subtype => if Atype_Defined then if not Is_Null_Literal_Type (Atype) then Error_Not_Match (Expr, Atype); Set_Type (Expr, Error_Type); else return Sem_Allocator (Expr, Atype); end if; else pragma Assert (Expr_Type = Null_Iir); Set_Type (Expr, Wildcard_Any_Access_Type); end if; return Expr; when Iir_Kind_Parenthesis_Expression => declare Sub_Expr : Iir; Ntype : Iir; begin Sub_Expr := Get_Expression (Expr); if Atype_Defined then -- Very important: loose the subtype due to -- LRM93 7.3.2.2 Array aggregate. Ntype := Get_Base_Type (Atype); else Ntype := Atype; end if; Sub_Expr := Sem_Expression_Wildcard (Sub_Expr, Ntype); if Sub_Expr /= Null_Iir then Set_Expression (Expr, Sub_Expr); Set_Type (Expr, Get_Type (Sub_Expr)); Set_Expr_Staticness (Expr, Get_Expr_Staticness (Sub_Expr)); else Set_Type (Expr, Error_Type); end if; end; return Expr; when others => if Atype_Defined then return Sem_Expression_Ov (Expr, Get_Base_Type (Atype)); else declare Res : Iir; Res_Type : Iir; Prev_Res_Type : Iir; begin pragma Assert (Expr_Type = Null_Iir); if Atype in Iir_Wildcard_Types then -- Analyze without known type. Res := Sem_Expression_Ov (Expr, Null_Iir); if Res = Null_Iir or else Is_Error (Res) then Set_Type (Expr, Error_Type); return Expr; end if; Prev_Res_Type := Get_Type (Res); -- Filter possible type. Res_Type := Compatible_Types_Intersect_Single_List (Atype, Prev_Res_Type); if Res_Type = Null_Iir then -- No matching type. This is an error. Error_Not_Match (Expr, Atype); Set_Type (Expr, Error_Type); elsif Is_Defined_Type (Res_Type) then -- Known and defined matching type. if Res_Type /= Prev_Res_Type then -- Need to refine analysis. Res := Sem_Expression_Ov (Expr, Res_Type); end if; else -- Matching but not defined type (overload). Set_Type (Expr, Res_Type); end if; if Is_Overload_List (Prev_Res_Type) then Free_Overload_List (Prev_Res_Type); end if; return Res; else pragma Assert (Atype = Null_Iir); return Sem_Expression_Ov (Expr, Atype); end if; end; end if; end case; end Sem_Expression_Wildcard; procedure Merge_Wildcard_Type (Expr : Iir; Atype : in out Iir) is Result_Type : Iir; Expr_Type : Iir; begin if Is_Error (Expr) then return; end if; -- Use the base type; EXPR may define its own subtype (like in -- qualified expression with forwarding) which must not be referenced -- above it. In any case, that also makes sense: we need to deal with -- types, not with subtypes. Expr_Type := Get_Base_Type (Get_Type (Expr)); pragma Assert (Expr_Type /= Null_Iir); Result_Type := Compatible_Types_Intersect (Atype, Expr_Type); if Atype /= Null_Iir and then Is_Overload_List (Atype) then Free_Overload_List (Atype); end if; if Result_Type /= Null_Iir then if Is_Defined_Type (Atype) then -- If ATYPE was already defined, keep it. So that subtypes -- are kept (this is needed for aggregates and always helpful). null; else Atype := Result_Type; end if; else Atype := Result_Type; end if; end Merge_Wildcard_Type; -- 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 analyzed 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 Are_Types_Compatible (Expr_Type, A_Type) = Not_Compatible then Error_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, False); when Iir_Kind_String_Literal8 => if A_Type = Null_Iir then Res := Sem_Expression_Ov (Expr, Null_Iir); else if not Is_String_Literal_Type (A_Type, Expr) then Error_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)); It : List_Iterator; Res_Type : Iir; Atype : Iir; begin Res_Type := Null_Iir; It := List_Iterate (List); while Is_Valid (It) loop Atype := Get_Element (It); if Is_Aggregate_Type (Atype) then Add_Result (Res_Type, Atype); end if; Next (It); 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; -- EXPR must be an expression with type is an overload list. -- Extract and finish the analysis of the expression that is of universal -- type, if there is one and if all types are either integer types or -- floating point types. -- This is used to get rid of implicit conversions. function Sem_Favour_Universal_Type (Expr : Iir) return Iir is Expr_Type : constant Iir := Get_Type (Expr); Type_List : constant Iir_List := Get_Overload_List (Expr_Type); -- Extract kind (from the first element). First_El : constant Iir := Get_First_Element (Type_List); Kind : constant Iir_Kind := Get_Kind (Get_Base_Type (First_El)); Res : Iir; El : Iir; It : List_Iterator; begin Res := Null_Iir; It := List_Iterate (Type_List); while Is_Valid (It) loop El := Get_Element (It); if Get_Kind (Get_Base_Type (El)) /= Kind then -- Must be of the same kind. Res := Null_Iir; exit; end if; 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 Res := Null_Iir; exit; end if; end if; Next (It); end loop; if Res = Null_Iir then Error_Overload (Expr); Disp_Overload_List (Type_List, Expr); return Null_Iir; end if; return Sem_Expression_Ov (Expr, Res); end Sem_Favour_Universal_Type; function Sem_Expression_Universal (Expr : Iir) return Iir is Expr1 : Iir; Expr_Type : Iir; begin Expr1 := Sem_Expression_Wildcard (Expr, Wildcard_Any_Type); Expr_Type := Get_Type (Expr1); if Is_Error (Expr_Type) then return Null_Iir; end if; if not Is_Overload_List (Expr_Type) then return Expr1; else return Sem_Favour_Universal_Type (Expr1); end if; 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; It : List_Iterator; 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 (+Expr, "cannot determine the type of choice expression"); if Get_Kind (Expr1) = Iir_Kind_Aggregate then Error_Msg_Sem (+Expr, "(use a qualified expression of the form T'(xxx).)"); 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; It := List_Iterate (List); while Is_Valid (It) loop El := Get_Element (It); 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; Next (It); 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 Insert_Condition_Operator (Cond : Iir) return Iir is Op : Iir; Res : Iir; begin Op := Create_Iir (Iir_Kind_Implicit_Condition_Operator); Location_Copy (Op, Cond); Set_Operand (Op, Cond); Res := Sem_Operator (Op, Boolean_Type_Definition, 1); Check_Read (Res); return Res; end Insert_Condition_Operator; function Sem_Condition (Cond : Iir) return Iir is Res : Iir; begin -- This function fully analyze COND, so it supposes COND is not yet -- analyzed. pragma Assert (Is_Expr_Not_Analyzed (Cond)); 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. Res := Sem_Expression_Ov (Cond, Null_Iir); if Res = Null_Iir then -- Error occurred. return Res; end if; if not Is_Overloaded (Res) then -- Only one result. Operator "??" is not applied if the result -- is of type boolean. if Are_Types_Compatible (Get_Type (Res), Boolean_Type_Definition) /= Not_Compatible then Check_Read (Res); return Res; end if; elsif Get_Type (Res) /= Null_Iir then -- Many interpretations. declare Res_List : constant Iir_List := Get_Overload_List (Get_Type (Res)); It : List_Iterator; El : Iir; Nbr_Booleans : Natural; begin Nbr_Booleans := 0; -- Extract boolean interpretations. It := List_Iterate (Res_List); while Is_Valid (It) loop El := Get_Element (It); if Are_Types_Compatible (El, Boolean_Type_Definition) /= Not_Compatible then Nbr_Booleans := Nbr_Booleans + 1; end if; Next (It); end loop; if Nbr_Booleans >= 1 then -- There is one or more boolean interpretations: keep them. -- In case of multiple boolean interpretations, an error -- message will be generated. Res := Sem_Expression_Ov (Cond, Boolean_Type_Definition); Check_Read (Res); return Res; end if; end; 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. return Insert_Condition_Operator (Res); end if; end Sem_Condition; end Vhdl.Sem_Expr;