X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gcc%2Fada%2Fsem_cat.adb;fp=gcc%2Fada%2Fsem_cat.adb;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=331dce6a1691b86b4422139e1c2c1c526106e547;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/gcc/ada/sem_cat.adb b/gcc/ada/sem_cat.adb deleted file mode 100644 index 331dce6a..00000000 --- a/gcc/ada/sem_cat.adb +++ /dev/null @@ -1,1804 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- S E M _ C A T -- --- -- --- B o d y -- --- -- --- $Revision: 1.1.16.1 $ --- -- --- Copyright (C) 1992-2001, Free Software Foundation, Inc. -- --- -- --- GNAT is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT 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 distributed with GNAT; see file COPYING. If not, write -- --- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- --- MA 02111-1307, USA. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- Extensive contributions were provided by Ada Core Technologies Inc. -- --- -- ------------------------------------------------------------------------------- - -with Atree; use Atree; -with Debug; use Debug; -with Einfo; use Einfo; -with Elists; use Elists; -with Errout; use Errout; -with Exp_Tss; use Exp_Tss; -with Fname; use Fname; -with Lib; use Lib; -with Nlists; use Nlists; -with Sem; use Sem; -with Sem_Util; use Sem_Util; -with Sinfo; use Sinfo; -with Snames; use Snames; -with Stand; use Stand; - -package body Sem_Cat is - - ----------------------- - -- Local Subprograms -- - ----------------------- - - procedure Check_Categorization_Dependencies - (Unit_Entity : Entity_Id; - Depended_Entity : Entity_Id; - Info_Node : Node_Id; - Is_Subunit : Boolean); - -- This procedure checks that the categorization of a lib unit and that - -- of the depended unit satisfy dependency restrictions. - -- The depended_entity can be the entity in a with_clause item, in which - -- case Info_Node denotes that item. The depended_entity can also be the - -- parent unit of a child unit, in which case Info_Node is the declaration - -- of the child unit. The error message is posted on Info_Node, and is - -- specialized if Is_Subunit is true. - - procedure Check_Non_Static_Default_Expr - (Type_Def : Node_Id; - Obj_Decl : Node_Id); - -- Iterate through the component list of a record definition, check - -- that no component is declared with a nonstatic default value. - -- If a nonstatic default exists, report an error on Obj_Decl. - - -- Iterate through the component list of a record definition, check - -- that no component is declared with a non-static default value. - - function Missing_Read_Write_Attributes (E : Entity_Id) return Boolean; - -- Return True if the entity or one of its subcomponent is an access - -- type which does not have user-defined Read and Write attribute. - - function In_RCI_Declaration (N : Node_Id) return Boolean; - -- Determines if a declaration is within the visible part of a Remote - -- Call Interface compilation unit, for semantic checking purposes only, - -- (returns false within an instance and within the package body). - - function In_RT_Declaration return Boolean; - -- Determines if current scope is within a Remote Types compilation unit, - -- for semantic checking purposes. - - function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean; - -- Returns true if the entity is a non-remote access type - - function In_Shared_Passive_Unit return Boolean; - -- Determines if current scope is within a Shared Passive compilation unit - - function Static_Discriminant_Expr (L : List_Id) return Boolean; - -- Iterate through the list of discriminants to check if any of them - -- contains non-static default expression, which is a violation in - -- a preelaborated library unit. - - procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id); - -- Check validity of declaration if RCI unit. It should not contain - -- the declaration of an access-to-object type unless it is a - -- general access type that designates a class-wide limited - -- private type. There are also constraints about the primitive - -- subprograms of the class-wide type. RM E.2 (9, 13, 14) - - function Is_Recursively_Limited_Private (E : Entity_Id) return Boolean; - -- Return True if E is a limited private type, or if E is a private - -- extension of a type whose parent verifies this property (hence the - -- recursive keyword). - - --------------------------------------- - -- Check_Categorization_Dependencies -- - --------------------------------------- - - procedure Check_Categorization_Dependencies - (Unit_Entity : Entity_Id; - Depended_Entity : Entity_Id; - Info_Node : Node_Id; - Is_Subunit : Boolean) - is - N : Node_Id := Info_Node; - - type Categorization is - (Pure, Shared_Passive, Remote_Types, - Remote_Call_Interface, Pre_Elaborated, Normal); - - Unit_Category : Categorization; - With_Category : Categorization; - - function Get_Categorization (E : Entity_Id) return Categorization; - -- Check categorization flags from entity, and return in the form - -- of a corresponding enumeration value. - - function Get_Categorization (E : Entity_Id) return Categorization is - begin - if Is_Preelaborated (E) then - return Pre_Elaborated; - elsif Is_Pure (E) then - return Pure; - elsif Is_Shared_Passive (E) then - return Shared_Passive; - elsif Is_Remote_Types (E) then - return Remote_Types; - elsif Is_Remote_Call_Interface (E) then - return Remote_Call_Interface; - else - return Normal; - end if; - end Get_Categorization; - - -- Start of processing for Check_Categorization_Dependencies - - begin - -- Intrinsic subprograms are preelaborated, so do not impose any - -- categorization dependencies. - - if Is_Intrinsic_Subprogram (Depended_Entity) then - return; - end if; - - Unit_Category := Get_Categorization (Unit_Entity); - With_Category := Get_Categorization (Depended_Entity); - - if With_Category > Unit_Category then - - if (Unit_Category = Remote_Types - or else Unit_Category = Remote_Call_Interface) - and then In_Package_Body (Unit_Entity) - then - null; - - elsif Is_Subunit then - Error_Msg_NE ("subunit cannot depend on&" - & " (parent has wrong categorization)", N, Depended_Entity); - else - Error_Msg_NE ("current unit cannot depend on&" - & " (wrong categorization)", N, Depended_Entity); - end if; - end if; - - end Check_Categorization_Dependencies; - - ----------------------------------- - -- Check_Non_Static_Default_Expr -- - ----------------------------------- - - procedure Check_Non_Static_Default_Expr - (Type_Def : Node_Id; - Obj_Decl : Node_Id) - is - Recdef : Node_Id; - Component_Decl : Node_Id; - - begin - if Nkind (Type_Def) = N_Derived_Type_Definition then - Recdef := Record_Extension_Part (Type_Def); - - if No (Recdef) then - return; - end if; - - else - Recdef := Type_Def; - end if; - - -- Check that component declarations do not involve: - - -- a. a non-static default expression, where the object is - -- declared to be default initialized. - - -- b. a dynamic Itype (discriminants and constraints) - - if Null_Present (Recdef) then - return; - else - Component_Decl := First (Component_Items (Component_List (Recdef))); - end if; - - while Present (Component_Decl) - and then Nkind (Component_Decl) = N_Component_Declaration - loop - if Present (Expression (Component_Decl)) - and then Nkind (Expression (Component_Decl)) /= N_Null - and then not Is_Static_Expression (Expression (Component_Decl)) - then - Error_Msg_Sloc := Sloc (Component_Decl); - Error_Msg_N - ("object in preelaborated unit has nonstatic default#", - Obj_Decl); - - -- Fix this later ??? - - -- elsif Has_Dynamic_Itype (Component_Decl) then - -- Error_Msg_N - -- ("dynamic type discriminant," & - -- " constraint in preelaborated unit", - -- Component_Decl); - end if; - - Next (Component_Decl); - end loop; - end Check_Non_Static_Default_Expr; - - --------------------------- - -- In_Preelaborated_Unit -- - --------------------------- - - function In_Preelaborated_Unit return Boolean is - Unit_Entity : constant Entity_Id := Current_Scope; - Unit_Kind : constant Node_Kind := - Nkind (Unit (Cunit (Current_Sem_Unit))); - - begin - -- There are no constraints on body of remote_call_interface or - -- remote_types packages.. - - return (Unit_Entity /= Standard_Standard) - and then (Is_Preelaborated (Unit_Entity) - or else Is_Pure (Unit_Entity) - or else Is_Shared_Passive (Unit_Entity) - or else - ((Is_Remote_Types (Unit_Entity) - or else Is_Remote_Call_Interface (Unit_Entity)) - and then Ekind (Unit_Entity) = E_Package - and then Unit_Kind /= N_Package_Body - and then not In_Package_Body (Unit_Entity) - and then not In_Instance)); - end In_Preelaborated_Unit; - - ------------------ - -- In_Pure_Unit -- - ------------------ - - function In_Pure_Unit return Boolean is - begin - return Is_Pure (Current_Scope); - end In_Pure_Unit; - - ------------------------ - -- In_RCI_Declaration -- - ------------------------ - - function In_RCI_Declaration (N : Node_Id) return Boolean is - Unit_Entity : constant Entity_Id := Current_Scope; - Unit_Kind : constant Node_Kind := - Nkind (Unit (Cunit (Current_Sem_Unit))); - - begin - -- There are no restrictions on the private part or body - -- of an RCI unit. - - return Is_Remote_Call_Interface (Unit_Entity) - and then (Ekind (Unit_Entity) = E_Package - or else Ekind (Unit_Entity) = E_Generic_Package) - and then Unit_Kind /= N_Package_Body - and then List_Containing (N) = - Visible_Declarations - (Specification (Unit_Declaration_Node (Unit_Entity))) - and then not In_Package_Body (Unit_Entity) - and then not In_Instance; - end In_RCI_Declaration; - - ----------------------- - -- In_RT_Declaration -- - ----------------------- - - function In_RT_Declaration return Boolean is - Unit_Entity : constant Entity_Id := Current_Scope; - Unit_Kind : constant Node_Kind := - Nkind (Unit (Cunit (Current_Sem_Unit))); - - begin - -- There are no restrictions on the body of a Remote Types unit. - - return Is_Remote_Types (Unit_Entity) - and then (Ekind (Unit_Entity) = E_Package - or else Ekind (Unit_Entity) = E_Generic_Package) - and then Unit_Kind /= N_Package_Body - and then not In_Package_Body (Unit_Entity) - and then not In_Instance; - end In_RT_Declaration; - - ---------------------------- - -- In_Shared_Passive_Unit -- - ---------------------------- - - function In_Shared_Passive_Unit return Boolean is - Unit_Entity : constant Entity_Id := Current_Scope; - - begin - return Is_Shared_Passive (Unit_Entity); - end In_Shared_Passive_Unit; - - --------------------------------------- - -- In_Subprogram_Task_Protected_Unit -- - --------------------------------------- - - function In_Subprogram_Task_Protected_Unit return Boolean is - E : Entity_Id; - K : Entity_Kind; - - begin - -- The following is to verify that a declaration is inside - -- subprogram, generic subprogram, task unit, protected unit. - -- Used to validate if a lib. unit is Pure. RM 10.2.1(16). - - -- Use scope chain to check successively outer scopes - - E := Current_Scope; - loop - K := Ekind (E); - - if K = E_Procedure - or else K = E_Function - or else K = E_Generic_Procedure - or else K = E_Generic_Function - or else K = E_Task_Type - or else K = E_Task_Subtype - or else K = E_Protected_Type - or else K = E_Protected_Subtype - then - return True; - - elsif E = Standard_Standard then - return False; - end if; - - E := Scope (E); - end loop; - - end In_Subprogram_Task_Protected_Unit; - - ------------------------------- - -- Is_Non_Remote_Access_Type -- - ------------------------------- - - function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean is - begin - return Is_Access_Type (E) - and then not Is_Remote_Access_To_Class_Wide_Type (E) - and then not Is_Remote_Access_To_Subprogram_Type (E); - end Is_Non_Remote_Access_Type; - - ------------------------------------ - -- Is_Recursively_Limited_Private -- - ------------------------------------ - - function Is_Recursively_Limited_Private (E : Entity_Id) return Boolean is - P : constant Node_Id := Parent (E); - - begin - if Nkind (P) = N_Private_Type_Declaration - and then Is_Limited_Record (E) - then - return True; - elsif Nkind (P) = N_Private_Extension_Declaration then - return Is_Recursively_Limited_Private (Etype (E)); - elsif Nkind (P) = N_Formal_Type_Declaration - and then Ekind (E) = E_Record_Type_With_Private - and then Is_Generic_Type (E) - and then Is_Limited_Record (E) - then - return True; - else - return False; - end if; - end Is_Recursively_Limited_Private; - - ---------------------------------- - -- Missing_Read_Write_Attribute -- - ---------------------------------- - - function Missing_Read_Write_Attributes (E : Entity_Id) return Boolean is - Component : Entity_Id; - Component_Type : Entity_Id; - - function Has_Read_Write_Attributes (E : Entity_Id) return Boolean; - -- Return True if entity has Read and Write attributes - - ------------------------------- - -- Has_Read_Write_Attributes -- - ------------------------------- - - function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is - Rep_Item : Node_Id := First_Rep_Item (E); - Read_Attribute : Boolean := False; - Write_Attribute : Boolean := False; - - begin - -- We start from the declaration node and then loop until the end - -- of the list until we find those two attribute definition clauses. - - while Present (Rep_Item) loop - if Chars (Rep_Item) = Name_Read then - Read_Attribute := True; - elsif Chars (Rep_Item) = Name_Write then - Write_Attribute := True; - end if; - - if Read_Attribute and Write_Attribute then - return True; - end if; - - Next_Rep_Item (Rep_Item); - end loop; - - return False; - end Has_Read_Write_Attributes; - - -- Start of processing for Missing_Read_Write_Attributes - - begin - if Has_Read_Write_Attributes (E) then - return False; - elsif Is_Non_Remote_Access_Type (E) then - return True; - end if; - - if Is_Record_Type (E) then - Component := First_Entity (E); - while Present (Component) loop - Component_Type := Etype (Component); - - if (Is_Non_Remote_Access_Type (Component_Type) - or else Is_Record_Type (Component_Type)) - and then Missing_Read_Write_Attributes (Component_Type) - then - return True; - end if; - - Next_Entity (Component); - end loop; - end if; - - return False; - end Missing_Read_Write_Attributes; - - ------------------------------------- - -- Set_Categorization_From_Pragmas -- - ------------------------------------- - - procedure Set_Categorization_From_Pragmas (N : Node_Id) is - P : constant Node_Id := Parent (N); - S : constant Entity_Id := Current_Scope; - - procedure Set_Parents (Visibility : Boolean); - -- If this is a child instance, the parents are not immediately - -- visible during analysis. Make them momentarily visible so that - -- the argument of the pragma can be resolved properly, and reset - -- afterwards. - - procedure Set_Parents (Visibility : Boolean) is - Par : Entity_Id := Scope (S); - - begin - while Present (Par) and then Par /= Standard_Standard loop - Set_Is_Immediately_Visible (Par, Visibility); - Par := Scope (Par); - end loop; - end Set_Parents; - - begin - -- Deal with categorization pragmas in Pragmas of Compilation_Unit. - -- The purpose is to set categorization flags before analyzing the - -- unit itself, so as to diagnose violations of categorization as - -- we process each declaration, even though the pragma appears after - -- the unit. - - if Nkind (P) /= N_Compilation_Unit then - return; - end if; - - declare - PN : Node_Id := First (Pragmas_After (Aux_Decls_Node (P))); - - begin - - if Is_Child_Unit (S) - and then Is_Generic_Instance (S) - then - Set_Parents (True); - end if; - - while Present (PN) loop - - -- Skip implicit types that may have been introduced by - -- previous analysis. - - if Nkind (PN) = N_Pragma then - - case Get_Pragma_Id (Chars (PN)) is - when Pragma_All_Calls_Remote | - Pragma_Preelaborate | - Pragma_Pure | - Pragma_Remote_Call_Interface | - Pragma_Remote_Types | - Pragma_Shared_Passive => Analyze (PN); - when others => null; - end case; - end if; - - Next (PN); - end loop; - if Is_Child_Unit (S) - and then Is_Generic_Instance (S) - then - Set_Parents (False); - end if; - - end; - end Set_Categorization_From_Pragmas; - - ------------------------------ - -- Static_Discriminant_Expr -- - ------------------------------ - - function Static_Discriminant_Expr (L : List_Id) return Boolean is - Discriminant_Spec : Node_Id; - - begin - Discriminant_Spec := First (L); - while Present (Discriminant_Spec) loop - if Present (Expression (Discriminant_Spec)) - and then not Is_Static_Expression (Expression (Discriminant_Spec)) - then - return False; - end if; - - Next (Discriminant_Spec); - end loop; - - return True; - end Static_Discriminant_Expr; - - -------------------------------------- - -- Validate_Access_Type_Declaration -- - -------------------------------------- - - procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id) is - Def : constant Node_Id := Type_Definition (N); - - begin - case Nkind (Def) is - when N_Access_To_Subprogram_Definition => - - -- A pure library_item must not contain the declaration of a - -- named access type, except within a subprogram, generic - -- subprogram, task unit, or protected unit (RM 10.2.1(16)). - - if Comes_From_Source (T) - and then In_Pure_Unit - and then not In_Subprogram_Task_Protected_Unit - then - Error_Msg_N ("named access type not allowed in pure unit", T); - end if; - - when N_Access_To_Object_Definition => - - if Comes_From_Source (T) - and then In_Pure_Unit - and then not In_Subprogram_Task_Protected_Unit - then - Error_Msg_N - ("named access type not allowed in pure unit", T); - end if; - - -- Check for RCI unit type declaration. It should not contain - -- the declaration of an access-to-object type unless it is a - -- general access type that designates a class-wide limited - -- private type. There are also constraints about the primitive - -- subprograms of the class-wide type. - - Validate_Remote_Access_Object_Type_Declaration (T); - - -- Check for shared passive unit type declaration. It should - -- not contain the declaration of access to class wide type, - -- access to task type and access to protected type with entry. - - Validate_SP_Access_Object_Type_Decl (T); - - when others => null; - end case; - - -- Set Categorization flag of package on entity as well, to allow - -- easy checks later on for required validations of RCI units. This - -- is only done for entities that are in the original source. - - if Comes_From_Source (T) then - if Is_Remote_Call_Interface (Scope (T)) - and then not In_Package_Body (Scope (T)) - then - Set_Is_Remote_Call_Interface (T); - end if; - - if Is_Remote_Types (Scope (T)) - and then not In_Package_Body (Scope (T)) - then - Set_Is_Remote_Types (T); - end if; - end if; - end Validate_Access_Type_Declaration; - - ---------------------------- - -- Validate_Ancestor_Part -- - ---------------------------- - - procedure Validate_Ancestor_Part (N : Node_Id) is - A : constant Node_Id := Ancestor_Part (N); - T : Entity_Id := Entity (A); - - begin - if In_Preelaborated_Unit - and then not In_Subprogram_Or_Concurrent_Unit - and then (not Inside_A_Generic - or else Present (Enclosing_Generic_Body (N))) - then - -- We relax the restriction of 10.2.1(9) within GNAT - -- units to allow packages such as Ada.Strings.Unbounded - -- to be implemented (i.p., Null_Unbounded_String). - -- (There are ACVC tests that check that the restriction - -- is enforced, but note that AI-161, once approved, - -- will relax the restriction prohibiting default- - -- initialized objects of private and controlled - -- types.) - - if Is_Private_Type (T) - and then not Is_Internal_File_Name - (Unit_File_Name (Get_Source_Unit (N))) - then - Error_Msg_N - ("private ancestor type not allowed in preelaborated unit", A); - - elsif Is_Record_Type (T) then - if Nkind (Parent (T)) = N_Full_Type_Declaration then - Check_Non_Static_Default_Expr - (Type_Definition (Parent (T)), A); - end if; - end if; - end if; - end Validate_Ancestor_Part; - - ---------------------------------------- - -- Validate_Categorization_Dependency -- - ---------------------------------------- - - procedure Validate_Categorization_Dependency - (N : Node_Id; - E : Entity_Id) - is - K : constant Node_Kind := Nkind (N); - P : Node_Id := Parent (N); - U : Entity_Id := E; - Is_Subunit : constant Boolean := Nkind (P) = N_Subunit; - - begin - -- Only validate library units and subunits. For subunits, checks - -- concerning withed units apply to the parent compilation unit. - - if Is_Subunit then - P := Parent (P); - U := Scope (E); - - while Present (U) - and then not Is_Compilation_Unit (U) - and then not Is_Child_Unit (U) - loop - U := Scope (U); - end loop; - - end if; - - if Nkind (P) /= N_Compilation_Unit then - return; - end if; - - -- Body of RCI unit does not need validation. - - if Is_Remote_Call_Interface (E) - and then (Nkind (N) = N_Package_Body - or else Nkind (N) = N_Subprogram_Body) - then - return; - end if; - - -- Process with clauses - - declare - Item : Node_Id; - Entity_Of_Withed : Entity_Id; - - begin - Item := First (Context_Items (P)); - - while Present (Item) loop - if Nkind (Item) = N_With_Clause - and then not Implicit_With (Item) - then - Entity_Of_Withed := Entity (Name (Item)); - Check_Categorization_Dependencies - (U, Entity_Of_Withed, Item, Is_Subunit); - end if; - - Next (Item); - end loop; - end; - - -- Child depends on parent; therefore parent should also - -- be categorized and satify the dependency hierarchy. - - -- Check if N is a child spec. - - if (K in N_Generic_Declaration or else - K in N_Generic_Instantiation or else - K in N_Generic_Renaming_Declaration or else - K = N_Package_Declaration or else - K = N_Package_Renaming_Declaration or else - K = N_Subprogram_Declaration or else - K = N_Subprogram_Renaming_Declaration) - and then Present (Parent_Spec (N)) - then - declare - Parent_Lib_U : constant Node_Id := Parent_Spec (N); - Parent_Kind : constant Node_Kind := - Nkind (Unit (Parent_Lib_U)); - Parent_Entity : Entity_Id; - - begin - if Parent_Kind = N_Package_Instantiation - or else Parent_Kind = N_Procedure_Instantiation - or else Parent_Kind = N_Function_Instantiation - or else Parent_Kind = N_Package_Renaming_Declaration - or else Parent_Kind in N_Generic_Renaming_Declaration - then - Parent_Entity := Defining_Entity (Unit (Parent_Lib_U)); - - else - Parent_Entity := - Defining_Entity (Specification (Unit (Parent_Lib_U))); - end if; - - Check_Categorization_Dependencies (E, Parent_Entity, N, False); - - -- Verify that public child of an RCI library unit - -- must also be an RCI library unit (RM E.2.3(15)). - - if Is_Remote_Call_Interface (Parent_Entity) - and then not Private_Present (P) - and then not Is_Remote_Call_Interface (E) - then - Error_Msg_N - ("public child of rci unit must also be rci unit", N); - return; - end if; - end; - end if; - - end Validate_Categorization_Dependency; - - -------------------------------- - -- Validate_Controlled_Object -- - -------------------------------- - - procedure Validate_Controlled_Object (E : Entity_Id) is - begin - -- For now, never apply this check for internal GNAT units, since we - -- have a number of cases in the library where we are stuck with objects - -- of this type, and the RM requires Preelaborate. - - -- For similar reasons, we only do this check for source entities, since - -- we generate entities of this type in some situations. - - -- Note that the 10.2.1(9) restrictions are not relevant to us anyway. - -- We have to enforce them for RM compatibility, but we have no trouble - -- accepting these objects and doing the right thing. Note that there is - -- no requirement that Preelaborate not actually generate any code! - - if In_Preelaborated_Unit - and then not Debug_Flag_PP - and then Comes_From_Source (E) - and then not - Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E))) - and then (not Inside_A_Generic - or else Present (Enclosing_Generic_Body (E))) - and then not Is_Protected_Type (Etype (E)) - then - Error_Msg_N - ("library level controlled object not allowed in " & - "preelaborated unit", E); - end if; - end Validate_Controlled_Object; - - -------------------------------------- - -- Validate_Null_Statement_Sequence -- - -------------------------------------- - - procedure Validate_Null_Statement_Sequence (N : Node_Id) is - Item : Node_Id; - - begin - if In_Preelaborated_Unit then - Item := First (Statements (Handled_Statement_Sequence (N))); - - while Present (Item) loop - if Nkind (Item) /= N_Label - and then Nkind (Item) /= N_Null_Statement - then - Error_Msg_N - ("statements not allowed in preelaborated unit", Item); - exit; - end if; - - Next (Item); - end loop; - end if; - end Validate_Null_Statement_Sequence; - - --------------------------------- - -- Validate_Object_Declaration -- - --------------------------------- - - procedure Validate_Object_Declaration (N : Node_Id) is - Id : constant Entity_Id := Defining_Identifier (N); - E : constant Node_Id := Expression (N); - Odf : constant Node_Id := Object_Definition (N); - T : constant Entity_Id := Etype (Id); - - begin - -- Verify that any access to subprogram object does not have in its - -- subprogram profile access type parameters or limited parameters - -- without Read and Write attributes (E.2.3(13)). - - Validate_RCI_Subprogram_Declaration (N); - - -- Check that if we are in preelaborated elaboration code, then we - -- do not have an instance of a default initialized private, task or - -- protected object declaration which would violate (RM 10.2.1(9)). - -- Note that constants are never default initialized (and the test - -- below also filters out deferred constants). A variable is default - -- initialized if it does *not* have an initialization expression. - - -- Filter out cases that are not declaration of a variable from source - - if Nkind (N) /= N_Object_Declaration - or else Constant_Present (N) - or else not Comes_From_Source (Id) - then - return; - end if; - - -- Exclude generic specs from the checks (this will get rechecked - -- on instantiations). - - if Inside_A_Generic - and then not Present (Enclosing_Generic_Body (Id)) - then - return; - end if; - - -- Required checks for declaration that is in a preelaborated - -- package and is not within some subprogram. - - if In_Preelaborated_Unit - and then not In_Subprogram_Or_Concurrent_Unit - then - -- Check for default initialized variable case. Note that in - -- accordance with (RM B.1(24)) imported objects are not - -- subject to default initialization. - - if No (E) and then not Is_Imported (Id) then - declare - Ent : Entity_Id := T; - - begin - -- An array whose component type is a record with nonstatic - -- default expressions is a violation, so we get the array's - -- component type. - - if Is_Array_Type (Ent) then - declare - Comp_Type : Entity_Id := Component_Type (Ent); - - begin - while Is_Array_Type (Comp_Type) loop - Comp_Type := Component_Type (Comp_Type); - end loop; - - Ent := Comp_Type; - end; - end if; - - -- Object decl. that is of record type and has no default expr. - -- should check if there is any non-static default expression - -- in component decl. of the record type decl. - - if Is_Record_Type (Ent) then - if Nkind (Parent (Ent)) = N_Full_Type_Declaration then - Check_Non_Static_Default_Expr - (Type_Definition (Parent (Ent)), N); - - elsif Nkind (Odf) = N_Subtype_Indication - and then not Is_Array_Type (T) - and then not Is_Private_Type (T) - then - Check_Non_Static_Default_Expr (Type_Definition - (Parent (Entity (Subtype_Mark (Odf)))), N); - end if; - end if; - - -- We relax the restriction of 10.2.1(9) within GNAT - -- units. (There are ACVC tests that check that the - -- restriction is enforced, but note that AI-161, - -- once approved, will relax the restriction prohibiting - -- default-initialized objects of private types, and - -- will recommend a pragma for marking private types.) - - if (Is_Private_Type (Ent) - or else Depends_On_Private (Ent)) - and then not Is_Internal_File_Name - (Unit_File_Name (Get_Source_Unit (N))) - then - Error_Msg_N - ("private object not allowed in preelaborated unit", N); - return; - - -- Access to Task or Protected type - - elsif Is_Entity_Name (Odf) - and then Present (Etype (Odf)) - and then Is_Access_Type (Etype (Odf)) - then - Ent := Designated_Type (Etype (Odf)); - - elsif Is_Entity_Name (Odf) then - Ent := Entity (Odf); - - elsif Nkind (Odf) = N_Subtype_Indication then - Ent := Etype (Subtype_Mark (Odf)); - - elsif - Nkind (Odf) = N_Constrained_Array_Definition - then - Ent := Component_Type (T); - - -- else - -- return; - end if; - - if Is_Task_Type (Ent) - or else (Is_Protected_Type (Ent) and then Has_Entries (Ent)) - then - Error_Msg_N - ("concurrent object not allowed in preelaborated unit", - N); - return; - end if; - end; - end if; - - -- Non-static discriminant not allowed in preelaborayted unit - - if Is_Record_Type (Etype (Id)) then - declare - ET : constant Entity_Id := Etype (Id); - EE : constant Entity_Id := Etype (Etype (Id)); - PEE : Node_Id; - - begin - if Has_Discriminants (ET) - and then Present (EE) - then - PEE := Parent (EE); - - if Nkind (PEE) = N_Full_Type_Declaration - and then not Static_Discriminant_Expr - (Discriminant_Specifications (PEE)) - then - Error_Msg_N - ("non-static discriminant in preelaborated unit", - PEE); - end if; - end if; - end; - end if; - end if; - - -- A pure library_item must not contain the declaration of any - -- variable except within a subprogram, generic subprogram, task - -- unit or protected unit (RM 10.2.1(16)). - - if In_Pure_Unit - and then not In_Subprogram_Task_Protected_Unit - then - Error_Msg_N ("declaration of variable not allowed in pure unit", N); - - -- The visible part of an RCI library unit must not contain the - -- declaration of a variable (RM E.1.3(9)) - - elsif In_RCI_Declaration (N) then - Error_Msg_N ("declaration of variable not allowed in rci unit", N); - - -- The visible part of a Shared Passive library unit must not contain - -- the declaration of a variable (RM E.2.2(7)) - - elsif In_RT_Declaration then - Error_Msg_N - ("variable declaration not allowed in remote types unit", N); - end if; - - end Validate_Object_Declaration; - - -------------------------------- - -- Validate_RCI_Declarations -- - -------------------------------- - - procedure Validate_RCI_Declarations (P : Entity_Id) is - E : Entity_Id; - - begin - E := First_Entity (P); - - while Present (E) loop - if Comes_From_Source (E) then - - if Is_Limited_Type (E) then - Error_Msg_N - ("Limited type not allowed in rci unit", Parent (E)); - - elsif Ekind (E) = E_Generic_Function - or else Ekind (E) = E_Generic_Package - or else Ekind (E) = E_Generic_Procedure - then - Error_Msg_N ("generic declaration not allowed in rci unit", - Parent (E)); - - elsif (Ekind (E) = E_Function - or else Ekind (E) = E_Procedure) - and then Has_Pragma_Inline (E) - then - Error_Msg_N - ("inlined subprogram not allowed in rci unit", Parent (E)); - - -- Inner packages that are renamings need not be checked. - -- Generic RCI packages are subject to the checks, but - -- entities that come from formal packages are not part of the - -- visible declarations of the package and are not checked. - - elsif Ekind (E) = E_Package then - if Present (Renamed_Entity (E)) then - null; - - elsif Ekind (P) /= E_Generic_Package - or else List_Containing (Unit_Declaration_Node (E)) /= - Generic_Formal_Declarations - (Unit_Declaration_Node (P)) - then - Validate_RCI_Declarations (E); - end if; - end if; - end if; - - Next_Entity (E); - end loop; - end Validate_RCI_Declarations; - - ----------------------------------------- - -- Validate_RCI_Subprogram_Declaration -- - ----------------------------------------- - - procedure Validate_RCI_Subprogram_Declaration (N : Node_Id) is - K : Node_Kind := Nkind (N); - Profile : List_Id; - Id : Node_Id; - Param_Spec : Node_Id; - Param_Type : Entity_Id; - Base_Param_Type : Entity_Id; - Type_Decl : Node_Id; - Error_Node : Node_Id := N; - - begin - -- There are two possible cases in which this procedure is called: - - -- 1. called from Analyze_Subprogram_Declaration. - -- 2. called from Validate_Object_Declaration (access to subprogram). - - if not In_RCI_Declaration (N) then - return; - end if; - - if K = N_Subprogram_Declaration then - Profile := Parameter_Specifications (Specification (N)); - - else pragma Assert (K = N_Object_Declaration); - Id := Defining_Identifier (N); - - if Nkind (Id) = N_Defining_Identifier - and then Nkind (Parent (Etype (Id))) = N_Full_Type_Declaration - and then Ekind (Etype (Id)) = E_Access_Subprogram_Type - then - Profile := - Parameter_Specifications (Type_Definition (Parent (Etype (Id)))); - else - return; - end if; - end if; - - -- Iterate through the parameter specification list, checking that - -- no access parameter and no limited type parameter in the list. - -- RM E.2.3 (14) - - if Present (Profile) then - Param_Spec := First (Profile); - - while Present (Param_Spec) loop - Param_Type := Etype (Defining_Identifier (Param_Spec)); - Type_Decl := Parent (Param_Type); - - if Ekind (Param_Type) = E_Anonymous_Access_Type then - - if K = N_Subprogram_Declaration then - Error_Node := Param_Spec; - end if; - - -- Report error only if declaration is in source program. - - if Comes_From_Source - (Defining_Entity (Specification (N))) - then - Error_Msg_N - ("subprogram in rci unit cannot have access parameter", - Error_Node); - end if; - - -- For limited private type parameter, we check only the - -- private declaration and ignore full type declaration, - -- unless this is the only declaration for the type, eg. - -- as a limited record. - - elsif Is_Limited_Type (Param_Type) - and then (Nkind (Type_Decl) = N_Private_Type_Declaration - or else - (Nkind (Type_Decl) = N_Full_Type_Declaration - and then not (Has_Private_Declaration (Param_Type)) - and then Comes_From_Source (N))) - then - - -- A limited parameter is legal only if user-specified - -- Read and Write attributes exist for it. - -- second part of RM E.2.3 (14) - - if No (Full_View (Param_Type)) - and then Ekind (Param_Type) /= E_Record_Type - then - -- type does not have completion yet, so if declared in - -- in the current RCI scope it is illegal, and will be - -- flagged subsequently. - return; - end if; - - Base_Param_Type := Base_Type (Underlying_Type (Param_Type)); - - if No (TSS (Base_Param_Type, Name_uRead)) - or else No (TSS (Base_Param_Type, Name_uWrite)) - then - - if K = N_Subprogram_Declaration then - Error_Node := Param_Spec; - end if; - - Error_Msg_N - ("limited parameter in rci unit " - & "must have read/write attributes ", Error_Node); - end if; - end if; - - Next (Param_Spec); - end loop; - end if; - end Validate_RCI_Subprogram_Declaration; - - ---------------------------------------------------- - -- Validate_Remote_Access_Object_Type_Declaration -- - ---------------------------------------------------- - - procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id) is - Direct_Designated_Type : Entity_Id; - Desig_Type : Entity_Id; - Primitive_Subprograms : Elist_Id; - Subprogram : Elmt_Id; - Subprogram_Node : Node_Id; - Profile : List_Id; - Param_Spec : Node_Id; - Param_Type : Entity_Id; - Limited_Type_Decl : Node_Id; - - begin - -- We are called from Analyze_Type_Declaration, and the Nkind - -- of the given node is N_Access_To_Object_Definition. - - if not Comes_From_Source (T) - or else (not In_RCI_Declaration (Parent (T)) - and then not In_RT_Declaration) - then - return; - end if; - - -- An access definition in the private part of a Remote Types package - -- may be legal if it has user-defined Read and Write attributes. This - -- will be checked at the end of the package spec processing. - - if In_RT_Declaration and then In_Private_Part (Scope (T)) then - return; - end if; - - -- Check RCI unit type declaration. It should not contain the - -- declaration of an access-to-object type unless it is a - -- general access type that designates a class-wide limited - -- private type. There are also constraints about the primitive - -- subprograms of the class-wide type (RM E.2.3(14)). - - if Ekind (T) /= E_General_Access_Type - or else Ekind (Designated_Type (T)) /= E_Class_Wide_Type - then - if In_RCI_Declaration (Parent (T)) then - Error_Msg_N - ("access type in Remote_Call_Interface unit must be " & - "general access", T); - else - Error_Msg_N ("access type in Remote_Types unit must be " & - "general access", T); - end if; - Error_Msg_N ("\to class-wide type", T); - return; - end if; - - Direct_Designated_Type := Designated_Type (T); - - Desig_Type := Etype (Direct_Designated_Type); - - if not Is_Recursively_Limited_Private (Desig_Type) then - Error_Msg_N - ("error in designated type of remote access to class-wide type", T); - Error_Msg_N - ("\must be tagged limited private or private extension of type", T); - return; - end if; - - Primitive_Subprograms := Primitive_Operations (Desig_Type); - Subprogram := First_Elmt (Primitive_Subprograms); - - while Subprogram /= No_Elmt loop - Subprogram_Node := Node (Subprogram); - - if not Comes_From_Source (Subprogram_Node) then - goto Next_Subprogram; - end if; - - Profile := Parameter_Specifications (Parent (Subprogram_Node)); - - -- Profile must exist, otherwise not primitive operation - - Param_Spec := First (Profile); - - while Present (Param_Spec) loop - - -- Now find out if this parameter is a controlling parameter - - Param_Type := Parameter_Type (Param_Spec); - - if (Nkind (Param_Type) = N_Access_Definition - and then Etype (Subtype_Mark (Param_Type)) = Desig_Type) - or else (Nkind (Param_Type) /= N_Access_Definition - and then Etype (Param_Type) = Desig_Type) - then - -- It is a controlling parameter, so specific checks below - -- do not apply. - - null; - - elsif - Nkind (Param_Type) = N_Access_Definition - then - -- From RM E.2.2(14), no access parameter other than - -- controlling ones may be used. - - Error_Msg_N - ("non-controlling access parameter", Param_Spec); - - elsif - Is_Limited_Type (Etype (Defining_Identifier (Param_Spec))) - then - -- Not a controlling parameter, so type must have Read - -- and Write attributes. - -- ??? I suspect this to be dead code because any violation - -- should be caught before in sem_attr.adb (with the message - -- "limited type ... used in ... has no stream attr."). ST - - if Nkind (Param_Type) in N_Has_Etype - and then Nkind (Parent (Etype (Param_Type))) = - N_Private_Type_Declaration - then - Param_Type := Etype (Param_Type); - Limited_Type_Decl := Parent (Param_Type); - - if No (TSS (Param_Type, Name_uRead)) - or else No (TSS (Param_Type, Name_uWrite)) - then - Error_Msg_N - ("limited formal must have Read and Write attributes", - Param_Spec); - end if; - end if; - end if; - - -- Check next parameter in this subprogram - - Next (Param_Spec); - end loop; - - <> - Next_Elmt (Subprogram); - end loop; - - -- Now this is an RCI unit access-to-class-wide-limited-private type - -- declaration. Set the type entity to be Is_Remote_Call_Interface to - -- optimize later checks by avoiding tree traversal to find out if this - -- entity is inside an RCI unit. - - Set_Is_Remote_Call_Interface (T); - - end Validate_Remote_Access_Object_Type_Declaration; - - ----------------------------------------------- - -- Validate_Remote_Access_To_Class_Wide_Type -- - ----------------------------------------------- - - procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id) is - K : constant Node_Kind := Nkind (N); - PK : constant Node_Kind := Nkind (Parent (N)); - E : Entity_Id; - - begin - -- This subprogram enforces the checks in (RM E.2.2(8)) for - -- certain uses of class-wide limited private types. - - -- Storage_Pool and Storage_Size are not defined for such types - -- - -- The expected type of allocator must not not be such a type. - - -- The actual parameter of generic instantiation must not - -- be such a type if the formal parameter is of an access type. - - -- On entry, there are five cases - - -- 1. called from sem_attr Analyze_Attribute where attribute - -- name is either Storage_Pool or Storage_Size. - - -- 2. called from exp_ch4 Expand_N_Allocator - - -- 3. called from sem_ch12 Analyze_Associations - - -- 4. called from sem_ch4 Analyze_Explicit_Dereference - - -- 5. called from sem_res Resolve_Actuals - - if K = N_Attribute_Reference then - E := Etype (Prefix (N)); - - if Is_Remote_Access_To_Class_Wide_Type (E) then - Error_Msg_N ("incorrect attribute of remote operand", N); - return; - end if; - - elsif K = N_Allocator then - E := Etype (N); - - if Is_Remote_Access_To_Class_Wide_Type (E) then - Error_Msg_N ("incorrect expected remote type of allocator", N); - return; - end if; - - elsif K in N_Has_Entity then - E := Entity (N); - - if Is_Remote_Access_To_Class_Wide_Type (E) then - Error_Msg_N ("incorrect remote type generic actual", N); - return; - end if; - - -- This subprogram also enforces the checks in E.2.2(13). - -- A value of such type must not be dereferenced unless as a - -- controlling operand of a dispatching call. - - elsif K = N_Explicit_Dereference - and then (Comes_From_Source (N) - or else (Nkind (Original_Node (N)) = N_Selected_Component - and then Comes_From_Source (Original_Node (N)))) - then - E := Etype (Prefix (N)); - - -- If the class-wide type is not a remote one, the restrictions - -- do not apply. - - if not Is_Remote_Access_To_Class_Wide_Type (E) then - return; - end if; - - -- If we have a true dereference that comes from source and that - -- is a controlling argument for a dispatching call, accept it. - - if K = N_Explicit_Dereference - and then Is_Actual_Parameter (N) - and then Is_Controlling_Actual (N) - then - return; - end if; - - -- If we are just within a procedure or function call and the - -- dereference has not been analyzed, return because this - -- procedure will be called again from sem_res Resolve_Actuals. - - if Is_Actual_Parameter (N) - and then not Analyzed (N) - then - return; - end if; - - -- The following is to let the compiler generated tags check - -- pass through without error message. This is a bit kludgy - -- isn't there some better way of making this exclusion ??? - - if (PK = N_Selected_Component - and then Present (Parent (Parent (N))) - and then Nkind (Parent (Parent (N))) = N_Op_Ne) - or else (PK = N_Unchecked_Type_Conversion - and then Present (Parent (Parent (N))) - and then - Nkind (Parent (Parent (N))) = N_Selected_Component) - then - return; - end if; - - -- The following code is needed for expansion of RACW Write - -- attribute, since such expressions can appear in the expanded - -- code. - - if not Comes_From_Source (N) - and then - (PK = N_In - or else PK = N_Attribute_Reference - or else - (PK = N_Type_Conversion - and then Present (Parent (N)) - and then Present (Parent (Parent (N))) - and then - Nkind (Parent (Parent (N))) = N_Selected_Component)) - then - return; - end if; - - Error_Msg_N ("incorrect remote type dereference", N); - end if; - end Validate_Remote_Access_To_Class_Wide_Type; - - ----------------------------------------------- - -- Validate_Remote_Access_To_Subprogram_Type -- - ----------------------------------------------- - - procedure Validate_Remote_Access_To_Subprogram_Type (N : Node_Id) is - Type_Def : constant Node_Id := Type_Definition (N); - Current_Parameter : Node_Id; - - begin - if Present (Parameter_Specifications (Type_Def)) then - Current_Parameter := First (Parameter_Specifications (Type_Def)); - while Present (Current_Parameter) loop - if Nkind (Parameter_Type (Current_Parameter)) = - N_Access_Definition - then - Error_Msg_N - ("remote access to subprogram type declaration contains", - Current_Parameter); - Error_Msg_N - ("\parameter of an anonymous access type", Current_Parameter); - end if; - - Current_Parameter := Next (Current_Parameter); - end loop; - end if; - end Validate_Remote_Access_To_Subprogram_Type; - - ------------------------------------------ - -- Validate_Remote_Type_Type_Conversion -- - ------------------------------------------ - - procedure Validate_Remote_Type_Type_Conversion (N : Node_Id) is - S : constant Entity_Id := Etype (N); - E : constant Entity_Id := Etype (Expression (N)); - - begin - -- This test is required in the case where a conversion appears - -- inside a normal package, it does not necessarily have to be - -- inside an RCI, Remote_Types unit (RM E.2.2(9,12)). - - if Is_Remote_Access_To_Subprogram_Type (E) - and then not Is_Remote_Access_To_Subprogram_Type (S) - then - Error_Msg_N ("incorrect conversion of remote operand", N); - return; - - elsif Is_Remote_Access_To_Class_Wide_Type (E) - and then not Is_Remote_Access_To_Class_Wide_Type (S) - then - Error_Msg_N ("incorrect conversion of remote operand", N); - return; - end if; - - -- If a local access type is converted into a RACW type, then the - -- current unit has a pointer that may now be exported to another - -- partition. - - if Is_Remote_Access_To_Class_Wide_Type (S) - and then not Is_Remote_Access_To_Class_Wide_Type (E) - then - Set_Has_RACW (Current_Sem_Unit); - end if; - end Validate_Remote_Type_Type_Conversion; - - ------------------------------- - -- Validate_RT_RAT_Component -- - ------------------------------- - - procedure Validate_RT_RAT_Component (N : Node_Id) is - Spec : constant Node_Id := Specification (N); - Name_U : constant Entity_Id := Defining_Entity (Spec); - Typ : Entity_Id; - First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U); - In_Visible_Part : Boolean := True; - - begin - if not Is_Remote_Types (Name_U) then - return; - end if; - - Typ := First_Entity (Name_U); - while Present (Typ) loop - if In_Visible_Part and then Typ = First_Priv_Ent then - In_Visible_Part := False; - end if; - - if Comes_From_Source (Typ) - and then Is_Type (Typ) - and then (In_Visible_Part or else Has_Private_Declaration (Typ)) - then - if Missing_Read_Write_Attributes (Typ) then - if Is_Non_Remote_Access_Type (Typ) then - Error_Msg_N - ("non-remote access type without user-defined Read " & - "and Write attributes", Typ); - else - Error_Msg_N - ("record type containing a component of a " & - "non-remote access", Typ); - Error_Msg_N - ("\type without Read and Write attributes " & - "('R'M E.2.2(8))", Typ); - end if; - end if; - end if; - - Next_Entity (Typ); - end loop; - end Validate_RT_RAT_Component; - - ----------------------------------------- - -- Validate_SP_Access_Object_Type_Decl -- - ----------------------------------------- - - procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id) is - Direct_Designated_Type : Entity_Id; - - function Has_Entry_Declarations (E : Entity_Id) return Boolean; - -- Return true if the protected type designated by T has - -- entry declarations. - - function Has_Entry_Declarations (E : Entity_Id) return Boolean is - Ety : Entity_Id; - - begin - if Nkind (Parent (E)) = N_Protected_Type_Declaration then - Ety := First_Entity (E); - while Present (Ety) loop - if Ekind (Ety) = E_Entry then - return True; - end if; - - Next_Entity (Ety); - end loop; - end if; - - return False; - end Has_Entry_Declarations; - - -- Start of processing for Validate_SP_Access_Object_Type_Decl - - begin - -- We are called from Sem_Ch3.Analyze_Type_Declaration, and the - -- Nkind of the given entity is N_Access_To_Object_Definition. - - if not Comes_From_Source (T) - or else not In_Shared_Passive_Unit - or else In_Subprogram_Task_Protected_Unit - then - return; - end if; - - -- Check Shared Passive unit. It should not contain the declaration - -- of an access-to-object type whose designated type is a class-wide - -- type, task type or protected type with entry (RM E.2.1(7)). - - Direct_Designated_Type := Designated_Type (T); - - if Ekind (Direct_Designated_Type) = E_Class_Wide_Type then - Error_Msg_N - ("invalid access-to-class-wide type in shared passive unit", T); - return; - - elsif Ekind (Direct_Designated_Type) in Task_Kind then - Error_Msg_N - ("invalid access-to-task type in shared passive unit", T); - return; - - elsif Ekind (Direct_Designated_Type) in Protected_Kind - and then Has_Entry_Declarations (Direct_Designated_Type) - then - Error_Msg_N - ("invalid access-to-protected type in shared passive unit", T); - return; - end if; - end Validate_SP_Access_Object_Type_Decl; - - --------------------------------- - -- Validate_Static_Object_Name -- - --------------------------------- - - procedure Validate_Static_Object_Name (N : Node_Id) is - E : Entity_Id; - - function Is_Primary (N : Node_Id) return Boolean; - -- Determine whether node is syntactically a primary in an expression. - - function Is_Primary (N : Node_Id) return Boolean is - K : constant Node_Kind := Nkind (Parent (N)); - - begin - case K is - - when N_Op | N_In | N_Not_In => - return True; - - when N_Aggregate - | N_Component_Association - | N_Index_Or_Discriminant_Constraint => - return True; - - when N_Attribute_Reference => - return Attribute_Name (Parent (N)) /= Name_Address - and then Attribute_Name (Parent (N)) /= Name_Access - and then Attribute_Name (Parent (N)) /= Name_Unchecked_Access - and then - Attribute_Name (Parent (N)) /= Name_Unrestricted_Access; - - when N_Indexed_Component => - return (N /= Prefix (Parent (N)) - or else Is_Primary (Parent (N))); - - when N_Qualified_Expression | N_Type_Conversion => - return Is_Primary (Parent (N)); - - when N_Assignment_Statement | N_Object_Declaration => - return (N = Expression (Parent (N))); - - when N_Selected_Component => - return Is_Primary (Parent (N)); - - when others => - return False; - end case; - end Is_Primary; - - -- Start of processing for Validate_Static_Object_Name - - begin - if not In_Preelaborated_Unit - or else not Comes_From_Source (N) - or else In_Subprogram_Or_Concurrent_Unit - or else Ekind (Current_Scope) = E_Block - then - return; - - -- Filter out cases where primary is default in a component - -- declaration, discriminant specification, or actual in a record - -- type initialization call. - - -- Initialization call of internal types. - - elsif Nkind (Parent (N)) = N_Procedure_Call_Statement then - - if Present (Parent (Parent (N))) - and then Nkind (Parent (Parent (N))) = N_Freeze_Entity - then - return; - end if; - - if Nkind (Name (Parent (N))) = N_Identifier - and then not Comes_From_Source (Entity (Name (Parent (N)))) - then - return; - end if; - end if; - - -- Error if the name is a primary in an expression. The parent must not - -- be an operator, or a selected component or an indexed component that - -- is itself a primary. Entities that are actuals do not need to be - -- checked, because the call itself will be diagnosed. - - if Is_Primary (N) - and then (not Inside_A_Generic - or else Present (Enclosing_Generic_Body (N))) - then - if Ekind (Entity (N)) = E_Variable then - Error_Msg_N ("non-static object name in preelaborated unit", N); - - -- We take the view that a constant defined in another preelaborated - -- unit is preelaborable, even though it may have a private type and - -- thus appear non-static in a client. This must be the intent of - -- the language, but currently is an RM gap. - - elsif Ekind (Entity (N)) = E_Constant - and then not Is_Static_Expression (N) - then - E := Entity (N); - - if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N))) - and then - Enclosing_Lib_Unit_Node (N) /= Enclosing_Lib_Unit_Node (E) - and then (Is_Preelaborated (Scope (E)) - or else Is_Pure (Scope (E)) - or else (Present (Renamed_Object (E)) - and then - Is_Entity_Name (Renamed_Object (E)) - and then - (Is_Preelaborated - (Scope (Renamed_Object (E))) - or else - Is_Pure (Scope - (Renamed_Object (E)))))) - then - null; - else - Error_Msg_N ("non-static constant in preelaborated unit", N); - end if; - end if; - end if; - end Validate_Static_Object_Name; - -end Sem_Cat;