2255 lines
79 KiB
Ada
2255 lines
79 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT COMPILER COMPONENTS --
|
|
-- --
|
|
-- S E M _ C A T --
|
|
-- --
|
|
-- B o d y --
|
|
-- --
|
|
-- Copyright (C) 1992-2016, 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 3, 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 COPYING3. If not, go to --
|
|
-- http://www.gnu.org/licenses for a complete copy of the license. --
|
|
-- --
|
|
-- 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_Disp; use Exp_Disp;
|
|
with Fname; use Fname;
|
|
with Lib; use Lib;
|
|
with Namet; use Namet;
|
|
with Nlists; use Nlists;
|
|
with Opt; use Opt;
|
|
with Sem; use Sem;
|
|
with Sem_Attr; use Sem_Attr;
|
|
with Sem_Aux; use Sem_Aux;
|
|
with Sem_Dist; use Sem_Dist;
|
|
with Sem_Eval; use Sem_Eval;
|
|
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.
|
|
|
|
function Has_Read_Write_Attributes (E : Entity_Id) return Boolean;
|
|
-- Return True if entity has attribute definition clauses for Read and
|
|
-- Write attributes that are visible at some place.
|
|
|
|
function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean;
|
|
-- Returns true if the entity is a type whose full view is a non-remote
|
|
-- access type, for the purpose of enforcing E.2.2(8) rules.
|
|
|
|
function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean;
|
|
-- Return true if Typ or the type of any of its subcomponents is a non
|
|
-- remote access type and doesn't have user-defined stream attributes.
|
|
|
|
function No_External_Streaming (E : Entity_Id) return Boolean;
|
|
-- Return True if the entity or one of its subcomponents does not support
|
|
-- external streaming.
|
|
|
|
function In_RCI_Declaration return Boolean;
|
|
function In_RT_Declaration return Boolean;
|
|
-- Determine if current scope is within the declaration of a Remote Call
|
|
-- Interface or Remote Types unit, for semantic checking purposes.
|
|
|
|
function In_Package_Declaration return Boolean;
|
|
-- Shared supporting routine for In_RCI_Declaration and In_RT_Declaration
|
|
|
|
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 or RT 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)
|
|
|
|
procedure Validate_RACW_Primitive
|
|
(Subp : Entity_Id;
|
|
RACW : Entity_Id);
|
|
-- Check legality of the declaration of primitive Subp of the designated
|
|
-- type of the given RACW type.
|
|
|
|
---------------------------------------
|
|
-- Check_Categorization_Dependencies --
|
|
---------------------------------------
|
|
|
|
procedure Check_Categorization_Dependencies
|
|
(Unit_Entity : Entity_Id;
|
|
Depended_Entity : Entity_Id;
|
|
Info_Node : Node_Id;
|
|
Is_Subunit : Boolean)
|
|
is
|
|
N : constant Node_Id := Info_Node;
|
|
Err : Boolean;
|
|
|
|
-- Here we define an enumeration type to represent categorization types,
|
|
-- ordered so that a unit with a given categorization can only WITH
|
|
-- units with lower or equal categorization type.
|
|
|
|
type Categorization is
|
|
(Pure,
|
|
Shared_Passive,
|
|
Remote_Types,
|
|
Remote_Call_Interface,
|
|
Normal);
|
|
|
|
function Get_Categorization (E : Entity_Id) return Categorization;
|
|
-- Check categorization flags from entity, and return in the form
|
|
-- of the lowest value of the Categorization type that applies to E.
|
|
|
|
------------------------
|
|
-- Get_Categorization --
|
|
------------------------
|
|
|
|
function Get_Categorization (E : Entity_Id) return Categorization is
|
|
begin
|
|
-- Get the lowest categorization that corresponds to E. Note that
|
|
-- nothing prevents several (different) categorization pragmas
|
|
-- to apply to the same library unit, in which case the unit has
|
|
-- all associated categories, so we need to be careful here to
|
|
-- check pragmas in proper Categorization order in order to
|
|
-- return the lowest applicable value.
|
|
|
|
-- Ignore Pure specification if set by pragma Pure_Function
|
|
|
|
if Is_Pure (E)
|
|
and then not
|
|
(Has_Pragma_Pure_Function (E) and not Has_Pragma_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;
|
|
|
|
Unit_Category : Categorization;
|
|
With_Category : Categorization;
|
|
|
|
-- Start of processing for Check_Categorization_Dependencies
|
|
|
|
begin
|
|
-- Intrinsic subprograms are preelaborated, so do not impose any
|
|
-- categorization dependencies. Also, ignore categorization
|
|
-- dependencies when compilation switch -gnatdu is used.
|
|
|
|
if Is_Intrinsic_Subprogram (Depended_Entity) or else Debug_Flag_U then
|
|
return;
|
|
end if;
|
|
|
|
-- First check 10.2.1 (11/1) rules on preelaborate packages
|
|
|
|
if Is_Preelaborated (Unit_Entity)
|
|
and then not Is_Preelaborated (Depended_Entity)
|
|
and then not Is_Pure (Depended_Entity)
|
|
then
|
|
Err := True;
|
|
else
|
|
Err := False;
|
|
end if;
|
|
|
|
-- Check categorization rules of RM E.2(5)
|
|
|
|
Unit_Category := Get_Categorization (Unit_Entity);
|
|
With_Category := Get_Categorization (Depended_Entity);
|
|
|
|
if With_Category > Unit_Category then
|
|
|
|
-- Special case: Remote_Types and Remote_Call_Interface are allowed
|
|
-- to WITH anything in the package body, per (RM E.2(5)).
|
|
|
|
if (Unit_Category = Remote_Types
|
|
or else Unit_Category = Remote_Call_Interface)
|
|
and then In_Package_Body (Unit_Entity)
|
|
then
|
|
null;
|
|
|
|
-- Special case: Remote_Types and Remote_Call_Interface declarations
|
|
-- can depend on a preelaborated unit via a private with_clause, per
|
|
-- AI05-0206.
|
|
|
|
elsif (Unit_Category = Remote_Types
|
|
or else
|
|
Unit_Category = Remote_Call_Interface)
|
|
and then Nkind (N) = N_With_Clause
|
|
and then Private_Present (N)
|
|
and then Is_Preelaborated (Depended_Entity)
|
|
then
|
|
null;
|
|
|
|
-- All other cases, we do have an error
|
|
|
|
else
|
|
Err := True;
|
|
end if;
|
|
end if;
|
|
|
|
-- Here if we have an error
|
|
|
|
if Err then
|
|
|
|
-- These messages are warnings in GNAT mode or if the -gnateP switch
|
|
-- was set. Otherwise these are real errors for real illegalities.
|
|
|
|
-- The reason we suppress these errors in GNAT mode is that the run-
|
|
-- time has several instances of violations of the categorization
|
|
-- errors (e.g. Pure units withing Preelaborate units. All these
|
|
-- violations are harmless in the cases where we intend them, and
|
|
-- we suppress the warnings with Warnings (Off). In cases where we
|
|
-- do not intend the violation, warnings are errors in GNAT mode
|
|
-- anyway, so we will still get an error.
|
|
|
|
Error_Msg_Warn :=
|
|
Treat_Categorization_Errors_As_Warnings or GNAT_Mode;
|
|
|
|
-- Don't give error if main unit is not an internal unit, and the
|
|
-- unit generating the message is an internal unit. This is the
|
|
-- situation in which such messages would be ignored in any case,
|
|
-- so it is convenient not to generate them (since it causes
|
|
-- annoying interference with debugging).
|
|
|
|
if Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
|
|
and then not Is_Internal_File_Name (Unit_File_Name (Main_Unit))
|
|
then
|
|
return;
|
|
|
|
-- Dependence of Remote_Types or Remote_Call_Interface declaration
|
|
-- on a preelaborated unit with a normal with_clause.
|
|
|
|
elsif (Unit_Category = Remote_Types
|
|
or else
|
|
Unit_Category = Remote_Call_Interface)
|
|
and then Is_Preelaborated (Depended_Entity)
|
|
then
|
|
Error_Msg_NE
|
|
("<<must use private with clause for preelaborated unit& ",
|
|
N, Depended_Entity);
|
|
|
|
-- Subunit case
|
|
|
|
elsif Is_Subunit then
|
|
Error_Msg_NE
|
|
("<subunit cannot depend on& " &
|
|
"(parent has wrong categorization)", N, Depended_Entity);
|
|
|
|
-- Normal unit, not subunit
|
|
|
|
else
|
|
Error_Msg_NE
|
|
("<<cannot depend on& " &
|
|
"(wrong categorization)", N, Depended_Entity);
|
|
end if;
|
|
|
|
-- Add further explanation for Pure/Preelaborate common cases
|
|
|
|
if Unit_Category = Pure then
|
|
Error_Msg_NE
|
|
("\<<pure unit cannot depend on non-pure unit",
|
|
N, Depended_Entity);
|
|
|
|
elsif Is_Preelaborated (Unit_Entity)
|
|
and then not Is_Preelaborated (Depended_Entity)
|
|
and then not Is_Pure (Depended_Entity)
|
|
then
|
|
Error_Msg_NE
|
|
("\<<preelaborated unit cannot depend on "
|
|
& "non-preelaborated unit",
|
|
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_OK_Static_Expression (Expression (Component_Decl))
|
|
then
|
|
Error_Msg_Sloc := Sloc (Component_Decl);
|
|
Error_Msg_F
|
|
("object in preelaborated unit has non-static 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;
|
|
|
|
---------------------------
|
|
-- Has_Non_Remote_Access --
|
|
---------------------------
|
|
|
|
function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean is
|
|
Component : Entity_Id;
|
|
Comp_Type : Entity_Id;
|
|
U_Typ : constant Entity_Id := Underlying_Type (Typ);
|
|
|
|
begin
|
|
if No (U_Typ) then
|
|
return False;
|
|
|
|
elsif Has_Read_Write_Attributes (Typ)
|
|
or else Has_Read_Write_Attributes (U_Typ)
|
|
then
|
|
return False;
|
|
|
|
elsif Is_Non_Remote_Access_Type (U_Typ) then
|
|
return True;
|
|
end if;
|
|
|
|
if Is_Record_Type (U_Typ) then
|
|
Component := First_Entity (U_Typ);
|
|
while Present (Component) loop
|
|
if not Is_Tag (Component) then
|
|
Comp_Type := Etype (Component);
|
|
|
|
if Has_Non_Remote_Access (Comp_Type) then
|
|
return True;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Entity (Component);
|
|
end loop;
|
|
|
|
elsif Is_Array_Type (U_Typ) then
|
|
return Has_Non_Remote_Access (Component_Type (U_Typ));
|
|
|
|
end if;
|
|
|
|
return False;
|
|
end Has_Non_Remote_Access;
|
|
|
|
-------------------------------
|
|
-- Has_Read_Write_Attributes --
|
|
-------------------------------
|
|
|
|
function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is
|
|
begin
|
|
return True
|
|
and then Has_Stream_Attribute_Definition
|
|
(E, TSS_Stream_Read, At_Any_Place => True)
|
|
and then Has_Stream_Attribute_Definition
|
|
(E, TSS_Stream_Write, At_Any_Place => True);
|
|
end Has_Read_Write_Attributes;
|
|
|
|
-------------------------------------
|
|
-- Has_Stream_Attribute_Definition --
|
|
-------------------------------------
|
|
|
|
function Has_Stream_Attribute_Definition
|
|
(Typ : Entity_Id;
|
|
Nam : TSS_Name_Type;
|
|
At_Any_Place : Boolean := False) return Boolean
|
|
is
|
|
Rep_Item : Node_Id;
|
|
|
|
Real_Rep : Node_Id;
|
|
-- The stream operation may be specified by an attribute definition
|
|
-- clause in the source, or by an aspect that generates such an
|
|
-- attribute definition. For an aspect, the generated attribute
|
|
-- definition may be placed at the freeze point of the full view of
|
|
-- the type, but the aspect specification makes the operation visible
|
|
-- to a client wherever the partial view is visible.
|
|
|
|
begin
|
|
-- We start from the declaration node and then loop until the end of
|
|
-- the list until we find the requested attribute definition clause.
|
|
-- In Ada 2005 mode, clauses are ignored if they are not currently
|
|
-- visible (this is tested using the corresponding Entity, which is
|
|
-- inserted by the expander at the point where the clause occurs),
|
|
-- unless At_Any_Place is true.
|
|
|
|
Rep_Item := First_Rep_Item (Typ);
|
|
while Present (Rep_Item) loop
|
|
Real_Rep := Rep_Item;
|
|
|
|
-- If the representation item is an aspect specification, retrieve
|
|
-- the corresponding pragma or attribute definition.
|
|
|
|
if Nkind (Rep_Item) = N_Aspect_Specification then
|
|
Real_Rep := Aspect_Rep_Item (Rep_Item);
|
|
end if;
|
|
|
|
if Nkind (Real_Rep) = N_Attribute_Definition_Clause then
|
|
case Chars (Real_Rep) is
|
|
when Name_Read =>
|
|
exit when Nam = TSS_Stream_Read;
|
|
|
|
when Name_Write =>
|
|
exit when Nam = TSS_Stream_Write;
|
|
|
|
when Name_Input =>
|
|
exit when Nam = TSS_Stream_Input;
|
|
|
|
when Name_Output =>
|
|
exit when Nam = TSS_Stream_Output;
|
|
|
|
when others =>
|
|
null;
|
|
end case;
|
|
end if;
|
|
|
|
Next_Rep_Item (Rep_Item);
|
|
end loop;
|
|
|
|
-- If not found, and the type is derived from a private view, check
|
|
-- for a stream attribute inherited from parent. Any specified stream
|
|
-- attributes will be attached to the derived type's underlying type
|
|
-- rather the derived type entity itself (which is itself private).
|
|
|
|
if No (Rep_Item)
|
|
and then Is_Private_Type (Typ)
|
|
and then Is_Derived_Type (Typ)
|
|
and then Present (Full_View (Typ))
|
|
then
|
|
return Has_Stream_Attribute_Definition
|
|
(Underlying_Type (Typ), Nam, At_Any_Place);
|
|
|
|
-- Otherwise, if At_Any_Place is true, return True if the attribute is
|
|
-- available at any place; if it is false, return True only if the
|
|
-- attribute is currently visible.
|
|
|
|
else
|
|
return Present (Rep_Item)
|
|
and then (Ada_Version < Ada_2005
|
|
or else At_Any_Place
|
|
or else not Is_Hidden (Entity (Rep_Item)));
|
|
end if;
|
|
end Has_Stream_Attribute_Definition;
|
|
|
|
----------------------------
|
|
-- In_Package_Declaration --
|
|
----------------------------
|
|
|
|
function In_Package_Declaration return Boolean is
|
|
Unit_Kind : constant Node_Kind :=
|
|
Nkind (Unit (Cunit (Current_Sem_Unit)));
|
|
|
|
begin
|
|
-- There are no restrictions on the body of an RCI or RT unit
|
|
|
|
return Is_Package_Or_Generic_Package (Current_Scope)
|
|
and then Unit_Kind /= N_Package_Body
|
|
and then not In_Package_Body (Current_Scope)
|
|
and then not In_Instance;
|
|
end In_Package_Declaration;
|
|
|
|
---------------------------
|
|
-- In_Preelaborated_Unit --
|
|
---------------------------
|
|
|
|
function In_Preelaborated_Unit return Boolean is
|
|
Unit_Entity : Entity_Id := Current_Scope;
|
|
Unit_Kind : constant Node_Kind :=
|
|
Nkind (Unit (Cunit (Current_Sem_Unit)));
|
|
|
|
begin
|
|
-- If evaluating actuals for a child unit instantiation, then ignore
|
|
-- the preelaboration status of the parent; use the child instead.
|
|
|
|
if Is_Compilation_Unit (Unit_Entity)
|
|
and then Unit_Kind in N_Generic_Instantiation
|
|
and then not In_Same_Source_Unit (Unit_Entity,
|
|
Cunit (Current_Sem_Unit))
|
|
then
|
|
Unit_Entity := Cunit_Entity (Current_Sem_Unit);
|
|
end if;
|
|
|
|
-- There are no constraints on the 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 return Boolean is
|
|
begin
|
|
return Is_Remote_Call_Interface (Current_Scope)
|
|
and then In_Package_Declaration;
|
|
end In_RCI_Declaration;
|
|
|
|
-----------------------
|
|
-- In_RT_Declaration --
|
|
-----------------------
|
|
|
|
function In_RT_Declaration return Boolean is
|
|
begin
|
|
return Is_Remote_Types (Current_Scope) and then In_Package_Declaration;
|
|
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;
|
|
|
|
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
|
|
if Is_Subprogram_Or_Generic_Subprogram (E)
|
|
or else
|
|
Is_Concurrent_Type (E)
|
|
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
|
|
U_E : constant Entity_Id := Underlying_Type (Base_Type (E));
|
|
-- Use full view of base type to handle subtypes properly.
|
|
|
|
begin
|
|
if No (U_E) then
|
|
|
|
-- This case arises for the case of a generic formal type, in which
|
|
-- case E.2.2(8) rules will be enforced at instantiation time.
|
|
|
|
return False;
|
|
end if;
|
|
|
|
return Is_Access_Type (U_E)
|
|
and then not Is_Remote_Access_To_Class_Wide_Type (U_E)
|
|
and then not Is_Remote_Access_To_Subprogram_Type (U_E);
|
|
end Is_Non_Remote_Access_Type;
|
|
|
|
---------------------------
|
|
-- No_External_Streaming --
|
|
---------------------------
|
|
|
|
function No_External_Streaming (E : Entity_Id) return Boolean is
|
|
U_E : constant Entity_Id := Underlying_Type (E);
|
|
|
|
begin
|
|
if No (U_E) then
|
|
return False;
|
|
|
|
elsif Has_Read_Write_Attributes (E) then
|
|
|
|
-- Note: availability of stream attributes is tested on E, not U_E.
|
|
-- There may be stream attributes defined on U_E that are not visible
|
|
-- at the place where support of external streaming is tested.
|
|
|
|
return False;
|
|
|
|
elsif Has_Non_Remote_Access (U_E) then
|
|
return True;
|
|
end if;
|
|
|
|
return Is_Limited_Type (E);
|
|
end No_External_Streaming;
|
|
|
|
-------------------------------------
|
|
-- 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.
|
|
|
|
-----------------
|
|
-- Set_Parents --
|
|
-----------------
|
|
|
|
procedure Set_Parents (Visibility : Boolean) is
|
|
Par : Entity_Id;
|
|
begin
|
|
Par := Scope (S);
|
|
while Present (Par) and then Par /= Standard_Standard loop
|
|
Set_Is_Immediately_Visible (Par, Visibility);
|
|
Par := Scope (Par);
|
|
end loop;
|
|
end Set_Parents;
|
|
|
|
-- Start of processing for Set_Categorization_From_Pragmas
|
|
|
|
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;
|
|
|
|
begin
|
|
if Is_Child_Unit (S) and then Is_Generic_Instance (S) then
|
|
Set_Parents (True);
|
|
end if;
|
|
|
|
PN := First (Pragmas_After (Aux_Decls_Node (P)));
|
|
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 (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;
|
|
|
|
-----------------------------------
|
|
-- Set_Categorization_From_Scope --
|
|
-----------------------------------
|
|
|
|
procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id) is
|
|
Declaration : Node_Id := Empty;
|
|
Specification : Node_Id := Empty;
|
|
|
|
begin
|
|
-- Do not modify the purity of an internally generated entity if it has
|
|
-- been explicitly marked as pure for optimization purposes.
|
|
|
|
if not Has_Pragma_Pure_Function (E) then
|
|
Set_Is_Pure
|
|
(E, Is_Pure (Scop) and then Is_Library_Level_Entity (E));
|
|
end if;
|
|
|
|
if not Is_Remote_Call_Interface (E) then
|
|
if Ekind (E) in Subprogram_Kind then
|
|
Declaration := Unit_Declaration_Node (E);
|
|
|
|
if Nkind_In (Declaration, N_Subprogram_Body,
|
|
N_Subprogram_Renaming_Declaration)
|
|
then
|
|
Specification := Corresponding_Spec (Declaration);
|
|
end if;
|
|
end if;
|
|
|
|
-- A subprogram body or renaming-as-body is a remote call interface
|
|
-- if it serves as the completion of a subprogram declaration that
|
|
-- is a remote call interface.
|
|
|
|
if Nkind (Specification) in N_Entity then
|
|
Set_Is_Remote_Call_Interface
|
|
(E, Is_Remote_Call_Interface (Specification));
|
|
|
|
-- A subprogram declaration is a remote call interface when it is
|
|
-- declared within the visible part of, or declared by, a library
|
|
-- unit declaration that is a remote call interface.
|
|
|
|
else
|
|
Set_Is_Remote_Call_Interface
|
|
(E, Is_Remote_Call_Interface (Scop)
|
|
and then not (In_Private_Part (Scop)
|
|
or else In_Package_Body (Scop)));
|
|
end if;
|
|
end if;
|
|
|
|
Set_Is_Remote_Types
|
|
(E, Is_Remote_Types (Scop)
|
|
and then not (In_Private_Part (Scop)
|
|
or else In_Package_Body (Scop)));
|
|
end Set_Categorization_From_Scope;
|
|
|
|
------------------------------
|
|
-- Static_Discriminant_Expr --
|
|
------------------------------
|
|
|
|
-- We need to accommodate a Why_Not_Static call somehow here ???
|
|
|
|
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_OK_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
|
|
|
|
-- Access to subprogram case
|
|
|
|
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)).
|
|
|
|
-- This test is skipped in Ada 2005 (see AI-366)
|
|
|
|
if Ada_Version < Ada_2005
|
|
and then 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;
|
|
|
|
-- Access to object case
|
|
|
|
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
|
|
-- We can't give the message yet, since the type is not frozen
|
|
-- and in Ada 2005 mode, access types are allowed in pure units
|
|
-- if the type has no storage pool (see AI-366). So we set a
|
|
-- flag which will be checked at freeze time.
|
|
|
|
Set_Is_Pure_Unit_Access_Type (T);
|
|
end if;
|
|
|
|
-- Check for RCI or RT unit type declaration: declaration of an
|
|
-- access-to-object type is illegal unless it is a general access
|
|
-- type that designates a class-wide limited private type.
|
|
-- Note that constraints on the primitive subprograms of the
|
|
-- designated tagged type are not enforced here but in
|
|
-- Validate_RACW_Primitives, which is done separately because the
|
|
-- designated type might not be frozen (and therefore its
|
|
-- primitive operations might not be completely known) at the
|
|
-- point of the RACW declaration.
|
|
|
|
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 from package on entity as well, to allow
|
|
-- easy checks later on for required validations of RCI or RT units.
|
|
-- This is only done for entities that are in the original source.
|
|
|
|
if Comes_From_Source (T)
|
|
and then not (In_Package_Body (Scope (T))
|
|
or else In_Private_Part (Scope (T)))
|
|
then
|
|
Set_Is_Remote_Call_Interface
|
|
(T, Is_Remote_Call_Interface (Scope (T)));
|
|
Set_Is_Remote_Types
|
|
(T, Is_Remote_Types (Scope (T)));
|
|
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 : constant 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
|
|
-- If the type is private, it must have the Ada 2005 pragma
|
|
-- Has_Preelaborable_Initialization.
|
|
|
|
-- The check is omitted within predefined units. This is probably
|
|
-- obsolete code to fix the Ada 95 weakness in this area ???
|
|
|
|
if Is_Private_Type (T)
|
|
and then not Has_Pragma_Preelab_Init (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_In (N, N_Package_Body, N_Subprogram_Body)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-50217): Process explicit non-limited 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)
|
|
or else Limited_Present (Item)
|
|
|
|
-- Skip if error already posted on the WITH clause (in
|
|
-- which case the Name attribute may be invalid). In
|
|
-- particular, this fixes the problem of hanging in the
|
|
-- presence of a WITH clause on a child that is an
|
|
-- illegal generic instantiation.
|
|
|
|
or else Error_Posted (Item))
|
|
and then
|
|
not (Try_Semantics
|
|
|
|
-- Skip processing malformed trees
|
|
|
|
and then Nkind (Name (Item)) not in N_Has_Entity)
|
|
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 satisfy 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
|
|
Check_Categorization_Dependencies (E, Scope (E), 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 (Scope (E))
|
|
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);
|
|
end if;
|
|
end if;
|
|
end Validate_Categorization_Dependency;
|
|
|
|
--------------------------------
|
|
-- Validate_Controlled_Object --
|
|
--------------------------------
|
|
|
|
procedure Validate_Controlled_Object (E : Entity_Id) is
|
|
begin
|
|
-- Don't need this check in Ada 2005 mode, where this is all taken
|
|
-- care of by the mechanism for Preelaborable Initialization.
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
return;
|
|
end if;
|
|
|
|
-- 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
|
|
-- In GNAT mode, this is a warning, allowing the run-time
|
|
-- to judiciously bypass this error condition.
|
|
|
|
Error_Msg_Warn := GNAT_Mode;
|
|
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 No (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 the initialization does not come from source and is an
|
|
-- aggregate, it is a static initialization that replaces an
|
|
-- implicit call, and must be treated as such.
|
|
|
|
if Present (E)
|
|
and then (Comes_From_Source (E) or else Nkind (E) /= N_Aggregate)
|
|
then
|
|
null;
|
|
|
|
elsif Is_Imported (Id) then
|
|
null;
|
|
|
|
else
|
|
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;
|
|
|
|
begin
|
|
Comp_Type := Component_Type (Ent);
|
|
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;
|
|
|
|
-- Check for invalid use of private object. Note that Ada 2005
|
|
-- AI-161 modifies the rules for Ada 2005, including the use of
|
|
-- the new pragma Preelaborable_Initialization.
|
|
|
|
if Is_Private_Type (Ent)
|
|
or else Depends_On_Private (Ent)
|
|
then
|
|
-- Case where type has preelaborable initialization which
|
|
-- means that a pragma Preelaborable_Initialization was
|
|
-- given for the private type.
|
|
|
|
if Relaxed_RM_Semantics then
|
|
|
|
-- In relaxed mode, do not issue these messages, this
|
|
-- is basically similar to the GNAT_Mode test below.
|
|
|
|
null;
|
|
|
|
elsif Has_Preelaborable_Initialization (Ent) then
|
|
|
|
-- But for the predefined units, we will ignore this
|
|
-- status unless we are in Ada 2005 mode since we want
|
|
-- Ada 95 compatible behavior, in which the entities
|
|
-- marked with this pragma in the predefined library are
|
|
-- not treated specially.
|
|
|
|
if Ada_Version < Ada_2005 then
|
|
Error_Msg_N
|
|
("private object not allowed in preelaborated unit",
|
|
N);
|
|
Error_Msg_N ("\(would be legal in Ada 2005 mode)", N);
|
|
end if;
|
|
|
|
-- Type does not have preelaborable initialization
|
|
|
|
else
|
|
-- We allow this when compiling in GNAT mode to make life
|
|
-- easier for some cases where it would otherwise be hard
|
|
-- to be exactly valid Ada.
|
|
|
|
if not GNAT_Mode then
|
|
Error_Msg_N
|
|
("private object not allowed in preelaborated unit",
|
|
N);
|
|
|
|
-- Add a message if it would help to provide a pragma
|
|
-- Preelaborable_Initialization on the type of the
|
|
-- object (which would make it legal in Ada 2005).
|
|
|
|
-- If the type has no full view (generic type, or
|
|
-- previous error), the warning does not apply.
|
|
|
|
if Is_Private_Type (Ent)
|
|
and then Present (Full_View (Ent))
|
|
and then
|
|
Has_Preelaborable_Initialization (Full_View (Ent))
|
|
then
|
|
Error_Msg_Sloc := Sloc (Ent);
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
Error_Msg_NE
|
|
("\would be legal if pragma Preelaborable_" &
|
|
"Initialization given for & #", N, Ent);
|
|
else
|
|
Error_Msg_NE
|
|
("\would be legal in Ada 2005 if pragma " &
|
|
"Preelaborable_Initialization given for & #",
|
|
N, Ent);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
-- 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);
|
|
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 discriminants not allowed in preelaborated unit.
|
|
-- Objects of a controlled type with a user-defined Initialize
|
|
-- are forbidden as well.
|
|
|
|
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;
|
|
|
|
-- For controlled type or type with controlled component, check
|
|
-- preelaboration flag, as there may be a non-null Initialize
|
|
-- primitive. For language versions earlier than Ada 2005,
|
|
-- there is no notion of preelaborable initialization, and
|
|
-- Validate_Controlled_Object is used to enforce rules for
|
|
-- controlled objects.
|
|
|
|
if (Is_Controlled (ET) or else Has_Controlled_Component (ET))
|
|
and then Ada_Version >= Ada_2005
|
|
and then not Has_Preelaborable_Initialization (ET)
|
|
then
|
|
Error_Msg_NE
|
|
("controlled type& does not have"
|
|
& " preelaborable initialization", N, ET);
|
|
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);
|
|
|
|
elsif not In_Private_Part (Id) then
|
|
|
|
-- The visible part of an RCI library unit must not contain the
|
|
-- declaration of a variable (RM E.1.3(9)).
|
|
|
|
if In_RCI_Declaration then
|
|
Error_Msg_N ("visible variable not allowed in 'R'C'I 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
|
|
("visible variable not allowed in remote types unit", N);
|
|
end if;
|
|
end if;
|
|
end Validate_Object_Declaration;
|
|
|
|
-----------------------------
|
|
-- Validate_RACW_Primitive --
|
|
-----------------------------
|
|
|
|
procedure Validate_RACW_Primitive
|
|
(Subp : Entity_Id;
|
|
RACW : Entity_Id)
|
|
is
|
|
procedure Illegal_Remote_Subp (Msg : String; N : Node_Id);
|
|
-- Diagnose illegality on N. If RACW is present, report the error on it
|
|
-- rather than on N.
|
|
|
|
-------------------------
|
|
-- Illegal_Remote_Subp --
|
|
-------------------------
|
|
|
|
procedure Illegal_Remote_Subp (Msg : String; N : Node_Id) is
|
|
begin
|
|
if Present (RACW) then
|
|
if not Error_Posted (RACW) then
|
|
Error_Msg_N
|
|
("illegal remote access to class-wide type&", RACW);
|
|
end if;
|
|
|
|
Error_Msg_Sloc := Sloc (N);
|
|
Error_Msg_NE ("\\" & Msg & " in primitive& #", RACW, Subp);
|
|
|
|
else
|
|
Error_Msg_NE (Msg & " in remote subprogram&", N, Subp);
|
|
end if;
|
|
end Illegal_Remote_Subp;
|
|
|
|
Rtyp : Entity_Id;
|
|
Param : Node_Id;
|
|
Param_Spec : Node_Id;
|
|
Param_Type : Entity_Id;
|
|
|
|
-- Start of processing for Validate_RACW_Primitive
|
|
|
|
begin
|
|
-- Check return type
|
|
|
|
if Ekind (Subp) = E_Function then
|
|
Rtyp := Etype (Subp);
|
|
|
|
-- AI05-0101 (Binding Interpretation): The result type of a remote
|
|
-- function must either support external streaming or be a
|
|
-- controlling access result type.
|
|
|
|
if Has_Controlling_Result (Subp) then
|
|
null;
|
|
|
|
elsif Ekind (Rtyp) = E_Anonymous_Access_Type then
|
|
Illegal_Remote_Subp ("anonymous access result", Rtyp);
|
|
|
|
elsif Is_Limited_Type (Rtyp) then
|
|
if No (TSS (Rtyp, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Rtyp, TSS_Stream_Write))
|
|
then
|
|
Illegal_Remote_Subp
|
|
("limited return type must have Read and Write attributes",
|
|
Parent (Subp));
|
|
Explain_Limited_Type (Rtyp, Parent (Subp));
|
|
end if;
|
|
|
|
-- Check that the return type supports external streaming
|
|
|
|
elsif No_External_Streaming (Rtyp)
|
|
and then not Error_Posted (Rtyp)
|
|
then
|
|
Illegal_Remote_Subp ("return type containing non-remote access "
|
|
& "must have Read and Write attributes",
|
|
Parent (Subp));
|
|
end if;
|
|
end if;
|
|
|
|
Param := First_Formal (Subp);
|
|
while Present (Param) loop
|
|
|
|
-- Now find out if this parameter is a controlling parameter
|
|
|
|
Param_Spec := Parent (Param);
|
|
Param_Type := Etype (Param);
|
|
|
|
if Is_Controlling_Formal (Param) then
|
|
|
|
-- It is a controlling parameter, so specific checks below do not
|
|
-- apply.
|
|
|
|
null;
|
|
|
|
elsif Ekind_In (Param_Type, E_Anonymous_Access_Type,
|
|
E_Anonymous_Access_Subprogram_Type)
|
|
then
|
|
-- From RM E.2.2(14), no anonymous access parameter other than
|
|
-- controlling ones may be used (because an anonymous access
|
|
-- type never supports external streaming).
|
|
|
|
Illegal_Remote_Subp
|
|
("non-controlling access parameter", Param_Spec);
|
|
|
|
elsif No_External_Streaming (Param_Type)
|
|
and then not Error_Posted (Param_Type)
|
|
then
|
|
Illegal_Remote_Subp ("formal parameter in remote subprogram must "
|
|
& "support external streaming", Param_Spec);
|
|
end if;
|
|
|
|
-- Check next parameter in this subprogram
|
|
|
|
Next_Formal (Param);
|
|
end loop;
|
|
end Validate_RACW_Primitive;
|
|
|
|
------------------------------
|
|
-- Validate_RACW_Primitives --
|
|
------------------------------
|
|
|
|
procedure Validate_RACW_Primitives (T : Entity_Id) is
|
|
Desig_Type : Entity_Id;
|
|
Primitive_Subprograms : Elist_Id;
|
|
Subprogram_Elmt : Elmt_Id;
|
|
Subprogram : Entity_Id;
|
|
|
|
begin
|
|
Desig_Type := Etype (Designated_Type (T));
|
|
|
|
-- No action needed for concurrent types
|
|
|
|
if Is_Concurrent_Type (Desig_Type) then
|
|
return;
|
|
end if;
|
|
|
|
Primitive_Subprograms := Primitive_Operations (Desig_Type);
|
|
|
|
Subprogram_Elmt := First_Elmt (Primitive_Subprograms);
|
|
while Subprogram_Elmt /= No_Elmt loop
|
|
Subprogram := Node (Subprogram_Elmt);
|
|
|
|
if Is_Predefined_Dispatching_Operation (Subprogram)
|
|
or else Is_Hidden (Subprogram)
|
|
then
|
|
goto Next_Subprogram;
|
|
end if;
|
|
|
|
Validate_RACW_Primitive (Subp => Subprogram, RACW => T);
|
|
|
|
<<Next_Subprogram>>
|
|
Next_Elmt (Subprogram_Elmt);
|
|
end loop;
|
|
end Validate_RACW_Primitives;
|
|
|
|
-------------------------------
|
|
-- 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));
|
|
Explain_Limited_Type (E, Parent (E));
|
|
|
|
elsif Ekind_In (E, E_Generic_Function,
|
|
E_Generic_Package,
|
|
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 : constant Node_Kind := Nkind (N);
|
|
Profile : List_Id;
|
|
Id : constant Entity_Id := Defining_Entity (N);
|
|
Param_Spec : Node_Id;
|
|
Param_Type : Entity_Id;
|
|
Error_Node : Node_Id := N;
|
|
|
|
begin
|
|
-- This procedure enforces rules on subprogram and access to subprogram
|
|
-- declarations in RCI units. These rules do not apply to expander
|
|
-- generated routines, which are not remote subprograms. It is called:
|
|
|
|
-- 1. from Analyze_Subprogram_Declaration.
|
|
-- 2. from Validate_Object_Declaration (access to subprogram).
|
|
|
|
if not (Comes_From_Source (N)
|
|
and then In_RCI_Declaration
|
|
and then not In_Private_Part (Scope (Id)))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
if K = N_Subprogram_Declaration then
|
|
Profile := Parameter_Specifications (Specification (N));
|
|
|
|
else
|
|
pragma Assert (K = N_Object_Declaration);
|
|
|
|
-- The above assertion is dubious, the visible declarations of an
|
|
-- RCI unit never contain an object declaration, this should be an
|
|
-- ACCESS-to-object declaration???
|
|
|
|
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));
|
|
|
|
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 (Id) then
|
|
Error_Msg_N
|
|
("subprogram in 'R'C'I unit cannot have access parameter",
|
|
Error_Node);
|
|
end if;
|
|
|
|
-- For a limited private type parameter, we check only the private
|
|
-- declaration and ignore full type declaration, unless this is
|
|
-- the only declaration for the type, e.g., as a limited record.
|
|
|
|
elsif No_External_Streaming (Param_Type) then
|
|
if K = N_Subprogram_Declaration then
|
|
Error_Node := Param_Spec;
|
|
end if;
|
|
|
|
Error_Msg_NE
|
|
("formal of remote subprogram& "
|
|
& "must support external streaming",
|
|
Error_Node, Id);
|
|
if Is_Limited_Type (Param_Type) then
|
|
Explain_Limited_Type (Param_Type, Error_Node);
|
|
end if;
|
|
end if;
|
|
|
|
Next (Param_Spec);
|
|
end loop;
|
|
end if;
|
|
|
|
if Ekind (Id) = E_Function
|
|
and then Ekind (Etype (Id)) = E_Anonymous_Access_Type
|
|
and then Comes_From_Source (Id)
|
|
then
|
|
Error_Msg_N
|
|
("function in 'R'C'I unit cannot have access result",
|
|
Error_Node);
|
|
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;
|
|
|
|
begin
|
|
-- We are called from Analyze_Full_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 and then not In_RT_Declaration)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- An access definition in the private part of a package is not a
|
|
-- remote access type. Restrictions related to external streaming
|
|
-- support for non-remote access types are enforced elsewhere. Note
|
|
-- that In_Private_Part is never set on type entities: check flag
|
|
-- on enclosing scope.
|
|
|
|
if In_Private_Part (Scope (T)) then
|
|
return;
|
|
end if;
|
|
|
|
-- Check RCI or RT unit type declaration. It may 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 or subtype.
|
|
-- There are also constraints on the primitive subprograms of the
|
|
-- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives).
|
|
|
|
if Ekind (T) /= E_General_Access_Type
|
|
or else not Is_Class_Wide_Type (Designated_Type (T))
|
|
then
|
|
if In_RCI_Declaration then
|
|
Error_Msg_N
|
|
("error in access type in Remote_Call_Interface unit", T);
|
|
else
|
|
Error_Msg_N
|
|
("error in access type in Remote_Types unit", T);
|
|
end if;
|
|
|
|
Error_Msg_N ("\must be general access to class-wide type", T);
|
|
return;
|
|
end if;
|
|
|
|
Direct_Designated_Type := Designated_Type (T);
|
|
Desig_Type := Etype (Direct_Designated_Type);
|
|
|
|
-- Why is this check not in Validate_Remote_Access_To_Class_Wide_Type???
|
|
|
|
if not Is_Valid_Remote_Object_Type (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", T);
|
|
return;
|
|
end if;
|
|
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 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 several 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_ch4 Analyze_Explicit_Dereference
|
|
|
|
-- 4. 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;
|
|
|
|
-- This subprogram also enforces the checks in E.2.2(13). A value of
|
|
-- such type must not be dereferenced unless as controlling operand of
|
|
-- a dispatching call. Explicit dereferences not coming from source are
|
|
-- exempted from this checking because the expander produces them in
|
|
-- some cases (such as for tag checks on dispatching calls with multiple
|
|
-- controlling operands). However we do check in the case of an implicit
|
|
-- dereference that is expanded to an explicit dereference (hence the
|
|
-- test of whether Original_Node (N) comes from source).
|
|
|
|
elsif K = N_Explicit_Dereference
|
|
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 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. The same can
|
|
-- apply in the case of dereference that is the prefix of a selected
|
|
-- component, which can be a call given in prefixed form.
|
|
|
|
if (Is_Actual_Parameter (N) or else PK = N_Selected_Component)
|
|
and then not Analyzed (N)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- We must allow expanded code to generate a reference to the tag of
|
|
-- the designated object (may be either the actual tag, or the stub
|
|
-- tag in the case of a remote object).
|
|
|
|
if PK = N_Selected_Component
|
|
and then Is_Tag (Entity (Selector_Name (Parent (N))))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
Error_Msg_N
|
|
("invalid dereference of a remote access-to-class-wide value", N);
|
|
end if;
|
|
end Validate_Remote_Access_To_Class_Wide_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 to local type", N);
|
|
return;
|
|
|
|
elsif not Is_Remote_Access_To_Subprogram_Type (E)
|
|
and then Is_Remote_Access_To_Subprogram_Type (S)
|
|
then
|
|
Error_Msg_N
|
|
("incorrect conversion of local operand to remote type", 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 to local type", 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;
|
|
U_Typ : Entity_Id;
|
|
First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U);
|
|
|
|
function Stream_Attributes_Available (Typ : Entity_Id) return Boolean;
|
|
-- True if any stream attribute is available for Typ
|
|
|
|
---------------------------------
|
|
-- Stream_Attributes_Available --
|
|
---------------------------------
|
|
|
|
function Stream_Attributes_Available (Typ : Entity_Id) return Boolean
|
|
is
|
|
begin
|
|
return Stream_Attribute_Available (Typ, TSS_Stream_Read)
|
|
or else
|
|
Stream_Attribute_Available (Typ, TSS_Stream_Write)
|
|
or else
|
|
Stream_Attribute_Available (Typ, TSS_Stream_Input)
|
|
or else
|
|
Stream_Attribute_Available (Typ, TSS_Stream_Output);
|
|
end Stream_Attributes_Available;
|
|
|
|
-- Start of processing for Validate_RT_RAT_Component
|
|
|
|
begin
|
|
if not Is_Remote_Types (Name_U) then
|
|
return;
|
|
end if;
|
|
|
|
Typ := First_Entity (Name_U);
|
|
while Present (Typ) and then Typ /= First_Priv_Ent loop
|
|
U_Typ := Underlying_Type (Base_Type (Typ));
|
|
|
|
if No (U_Typ) then
|
|
U_Typ := Typ;
|
|
end if;
|
|
|
|
if Comes_From_Source (Typ) and then Is_Type (Typ) then
|
|
|
|
-- Check that the type can be meaningfully transmitted to another
|
|
-- partition (E.2.2(8)).
|
|
|
|
if (Ada_Version < Ada_2005 and then Has_Non_Remote_Access (U_Typ))
|
|
or else (Stream_Attributes_Available (Typ)
|
|
and then No_External_Streaming (U_Typ))
|
|
then
|
|
if Is_Non_Remote_Access_Type (Typ) then
|
|
Error_Msg_N ("error in non-remote access type", U_Typ);
|
|
else
|
|
Error_Msg_N
|
|
("error in record type containing a component of a " &
|
|
"non-remote access type", U_Typ);
|
|
end if;
|
|
|
|
if Ada_Version >= Ada_2005 then
|
|
Error_Msg_N
|
|
("\must have visible Read and Write attribute " &
|
|
"definition clauses (RM E.2.2(8))", U_Typ);
|
|
else
|
|
Error_Msg_N
|
|
("\must have Read and Write attribute " &
|
|
"definition clauses (RM E.2.2(8))", U_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.
|
|
|
|
----------------------------
|
|
-- 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_Full_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;
|
|
Val : Node_Id;
|
|
|
|
function Is_Primary (N : Node_Id) return Boolean;
|
|
-- Determine whether node is syntactically a primary in an expression
|
|
-- This function should probably be somewhere else ???
|
|
--
|
|
-- Also it does not do what it says, e.g if N is a binary operator
|
|
-- whose parent is a binary operator, Is_Primary returns True ???
|
|
|
|
----------------
|
|
-- Is_Primary --
|
|
----------------
|
|
|
|
function Is_Primary (N : Node_Id) return Boolean is
|
|
K : constant Node_Kind := Nkind (Parent (N));
|
|
|
|
begin
|
|
case K is
|
|
when N_Aggregate
|
|
| N_Component_Association
|
|
| N_Index_Or_Discriminant_Constraint
|
|
| N_Membership_Test
|
|
| N_Op
|
|
=>
|
|
return True;
|
|
|
|
when N_Attribute_Reference =>
|
|
declare
|
|
Attr : constant Name_Id := Attribute_Name (Parent (N));
|
|
|
|
begin
|
|
return Attr /= Name_Address
|
|
and then Attr /= Name_Access
|
|
and then Attr /= Name_Unchecked_Access
|
|
and then Attr /= Name_Unrestricted_Access;
|
|
end;
|
|
|
|
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. Entities in a
|
|
-- generic unit or within a preanalyzed expression are not checked:
|
|
-- only their use in executable code matters.
|
|
|
|
if Is_Primary (N)
|
|
and then (not Inside_A_Generic
|
|
or else Present (Enclosing_Generic_Body (N)))
|
|
and then not In_Spec_Expression
|
|
then
|
|
if Ekind (Entity (N)) = E_Variable
|
|
or else Ekind (Entity (N)) in Formal_Object_Kind
|
|
then
|
|
Flag_Non_Static_Expr
|
|
("non-static object name in preelaborated unit", N);
|
|
|
|
-- Give an error for a reference to a nonstatic constant, unless the
|
|
-- constant is in another GNAT library unit that is preelaborable.
|
|
|
|
elsif Ekind (Entity (N)) = E_Constant
|
|
and then not Is_Static_Expression (N)
|
|
then
|
|
E := Entity (N);
|
|
Val := Constant_Value (E);
|
|
|
|
if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N)))
|
|
and then
|
|
Enclosing_Comp_Unit_Node (N) /= Enclosing_Comp_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;
|
|
|
|
-- If the value of the constant is a local variable that renames
|
|
-- an aggregate, this is in itself legal. The aggregate may be
|
|
-- expanded into a loop, but this does not affect preelaborability
|
|
-- in itself. If some aggregate components are non-static, that is
|
|
-- to say if they involve non static primaries, they will be
|
|
-- flagged when analyzed.
|
|
|
|
elsif Present (Val)
|
|
and then Is_Entity_Name (Val)
|
|
and then Is_Array_Type (Etype (Val))
|
|
and then not Comes_From_Source (Val)
|
|
and then Nkind (Original_Node (Val)) = N_Aggregate
|
|
then
|
|
null;
|
|
|
|
-- This is the error case
|
|
|
|
else
|
|
-- In GNAT mode or Relaxed RM Semantic mode, this is just a
|
|
-- warning, to allow it to be judiciously turned off.
|
|
-- Otherwise it is a real error.
|
|
|
|
if GNAT_Mode or Relaxed_RM_Semantics then
|
|
Error_Msg_N
|
|
("??non-static constant in preelaborated unit", N);
|
|
else
|
|
Flag_Non_Static_Expr
|
|
("non-static constant in preelaborated unit", N);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end Validate_Static_Object_Name;
|
|
|
|
end Sem_Cat;
|