254 lines
12 KiB
Ada
254 lines
12 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- R E S T R I C T --
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-- --
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-- S p e c --
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-- --
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-- $Revision: 1.27 $
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-- --
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-- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This package deals with the implementation of the Restrictions pragma
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with Rident;
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with Types; use Types;
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with Uintp; use Uintp;
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package Restrict is
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type Restriction_Id is new Rident.Restriction_Id;
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-- The type Restriction_Id defines the set of restriction identifiers,
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-- which take no parameter (i.e. they are either present or not present).
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-- The actual definition is in the separate package Rident, so that it
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-- can easily be accessed by the binder without dragging in lots of stuff.
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subtype Partition_Restrictions is
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Restriction_Id range
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Restriction_Id (Rident.Partition_Restrictions'First) ..
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Restriction_Id (Rident.Partition_Restrictions'Last);
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-- Range of restriction identifiers that are checked by the binder
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subtype Compilation_Unit_Restrictions is
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Restriction_Id range
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Restriction_Id (Rident.Compilation_Unit_Restrictions'First) ..
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Restriction_Id (Rident.Compilation_Unit_Restrictions'Last);
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-- Range of restriction identifiers not checked by binder
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type Restriction_Parameter_Id is new Rident.Restriction_Parameter_Id;
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-- The type Restriction_Parameter_Id records cases where a parameter is
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-- present in the corresponding pragma. These cases are not checked for
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-- consistency by the binder. The actual definition is in the separate
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-- package Rident for consistency.
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type Restrictions_Flags is array (Restriction_Id) of Boolean;
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-- Type used for arrays indexed by Restriction_Id.
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Restrictions : Restrictions_Flags := (others => False);
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-- Corresponding entry is False if restriction is not active, and
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-- True if the restriction is active, i.e. if a pragma Restrictions
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-- has been seen anywhere. Note that we are happy to pick up any
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-- restrictions pragmas in with'ed units, since we are required to
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-- be consistent at link time, and we might as well find the error
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-- at compile time. Clients must NOT use this array for checking to
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-- see if a restriction is violated, instead it is required that the
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-- Check_Restrictions subprograms be used for this purpose. The only
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-- legitimate direct use of this array is when the code is modified
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-- as a result of the restriction in some way.
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Restrictions_Loc : array (Restriction_Id) of Source_Ptr;
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-- Locations of Restrictions pragmas for error message purposes.
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-- Valid only if corresponding entry in Restrictions is set.
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Main_Restrictions : Restrictions_Flags := (others => False);
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-- This variable saves the cumulative restrictions in effect compiling
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-- any unit that is part of the extended main unit (i.e. the compiled
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-- unit, its spec if any, and its subunits if any). The reason we keep
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-- track of this is for the information that goes to the binder about
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-- restrictions that are set. The binder will identify a unit that has
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-- a restrictions pragma for error message purposes, and we do not want
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-- to pick up a restrictions pragma in a with'ed unit for this purpose.
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Violations : Restrictions_Flags := (others => False);
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-- Corresponding entry is False if the restriction has not been
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-- violated in the current main unit, and True if it has been violated.
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Restriction_Parameters :
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array (Restriction_Parameter_Id) of Uint := (others => No_Uint);
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-- This array indicates the setting of restriction parameter identifier
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-- values. All values are initially set to No_Uint indicating that the
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-- parameter is not set, and are set to the appropriate non-negative
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-- value if a Restrictions pragma specifies the corresponding
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-- restriction parameter identifier with an appropriate value.
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Restriction_Parameters_Loc :
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array (Restriction_Parameter_Id) of Source_Ptr;
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-- Locations of Restrictions pragmas for error message purposes.
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-- Valid only if corresponding entry in Restriction_Parameters is
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-- set to a value other than No_Uint.
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type Unit_Entry is record
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Res_Id : Restriction_Id;
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Filenm : String (1 .. 8);
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end record;
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type Unit_Array_Type is array (Positive range <>) of Unit_Entry;
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Unit_Array : constant Unit_Array_Type := (
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(No_Asynchronous_Control, "a-astaco"),
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(No_Calendar, "a-calend"),
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(No_Calendar, "calendar"),
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(No_Delay, "a-calend"),
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(No_Delay, "calendar"),
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(No_Dynamic_Priorities, "a-dynpri"),
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(No_IO, "a-direio"),
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(No_IO, "directio"),
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(No_IO, "a-sequio"),
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(No_IO, "sequenio"),
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(No_IO, "a-ststio"),
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(No_IO, "a-textio"),
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(No_IO, "text_io "),
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(No_IO, "a-witeio"),
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(No_Task_Attributes, "a-tasatt"),
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(No_Streams, "a-stream"),
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(No_Unchecked_Conversion, "a-unccon"),
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(No_Unchecked_Conversion, "unchconv"),
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(No_Unchecked_Deallocation, "a-uncdea"),
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(No_Unchecked_Deallocation, "unchdeal"));
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-- This array defines the mapping between restriction identifiers and
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-- predefined language files containing units for which the identifier
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-- forbids semantic dependence.
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type Save_Compilation_Unit_Restrictions is private;
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-- Type used for saving and restoring compilation unit restrictions.
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-- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
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-----------------
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-- Subprograms --
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-----------------
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procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id);
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-- Checks if loading of unit U is prohibited by the setting of some
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-- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO).
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-- If a restriction exists post error message at the given node.
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procedure Check_Restriction (R : Restriction_Id; N : Node_Id);
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-- Checks that the given restriction is not set, and if it is set, an
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-- appropriate message is posted on the given node. Also records the
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-- violation in the violations array. Note that it is mandatory to
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-- always use this routine to check if a restriction is violated. Such
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-- checks must never be done directly by the caller, since otherwise
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-- they are not properly recorded in the violations array.
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procedure Check_Restriction
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(R : Restriction_Parameter_Id;
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N : Node_Id);
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-- Checks that the given restriction parameter identifier is not set to
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-- zero. If it is set to zero, then the node N is replaced by a node
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-- that raises Storage_Error, and a warning is issued.
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procedure Check_Restriction
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(R : Restriction_Parameter_Id;
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V : Uint;
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N : Node_Id);
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-- Checks that the count in V does not exceed the maximum value of the
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-- restriction parameter value corresponding to the given restriction
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-- parameter identifier (if it has been set). If the count in V exceeds
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-- the maximum, then post an error message on node N.
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procedure Check_Elaboration_Code_Allowed (N : Node_Id);
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-- Tests to see if elaboration code is allowed by the current restrictions
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-- settings. This function is called by Gigi when it needs to define
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-- an elaboration routine. If elaboration code is not allowed, an error
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-- message is posted on the node given as argument.
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function No_Exception_Handlers_Set return Boolean;
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-- Test to see if current restrictions settings specify that no exception
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-- handlers are present. This function is called by Gigi when it needs to
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-- expand an AT END clean up identifier with no exception handler.
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function Compilation_Unit_Restrictions_Save
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return Save_Compilation_Unit_Restrictions;
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-- This function saves the compilation unit restriction settings, and
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-- resets them to False. This is used e.g. when compiling a with'ed
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-- unit to avoid incorrectly propagating restrictions. Note that it
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-- would not be wrong to also save and reset the partition restrictions,
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-- since the binder would catch inconsistencies, but actually it is a
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-- good thing to acquire restrictions from with'ed units if they are
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-- required to be partition wide, because it allows the restriction
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-- violation message to be given at compile time instead of link time.
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procedure Compilation_Unit_Restrictions_Restore
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(R : Save_Compilation_Unit_Restrictions);
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-- This is the corresponding restore procedure to restore restrictions
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-- previously saved by Compilation_Unit_Restrictions_Save.
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procedure Disallow_In_No_Run_Time_Mode (Enode : Node_Id);
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-- If in No_Run_Time mode, then the construct represented by Enode is
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-- not permitted, and will be appropriately flagged.
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procedure Set_No_Run_Time_Mode;
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-- Set the no run time mode, and associated restriction pragmas.
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function Get_Restriction_Id
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(N : Name_Id)
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return Restriction_Id;
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-- Given an identifier name, determines if it is a valid restriction
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-- identifier, and if so returns the corresponding Restriction_Id
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-- value, otherwise returns Not_A_Restriction_Id.
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function Get_Restriction_Parameter_Id
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(N : Name_Id)
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return Restriction_Parameter_Id;
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-- Given an identifier name, determines if it is a valid restriction
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-- parameter identifier, and if so returns the corresponding
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-- Restriction_Parameter_Id value, otherwise returns
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-- Not_A_Restriction_Parameter_Id.
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function Abort_Allowed return Boolean;
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pragma Inline (Abort_Allowed);
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-- Tests to see if abort is allowed by the current restrictions settings.
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-- For abort to be allowed, either No_Abort_Statements must be False,
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-- or Max_Asynchronous_Select_Nesting must be non-zero.
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function Restricted_Profile return Boolean;
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-- Tests to see if tasking operations follow the GNAT restricted run time
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-- profile.
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procedure Set_Ravenscar;
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-- Sets the set of rerstrictions fro Ravenscar
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procedure Set_Restricted_Profile;
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-- Sets the set of restrictions for pragma Restricted_Run_Time
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function Tasking_Allowed return Boolean;
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pragma Inline (Tasking_Allowed);
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-- Tests to see if tasking operations are allowed by the current
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-- restrictions settings. For tasking to be allowed Max_Tasks must
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-- be non-zero.
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private
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type Save_Compilation_Unit_Restrictions is
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array (Compilation_Unit_Restrictions) of Boolean;
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-- Type used for saving and restoring compilation unit restrictions.
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-- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
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end Restrict;
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