+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- R E S T R I C T --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package deals with the implementation of the Restrictions pragma
-
-with Rident;
-with Types; use Types;
-with Uintp; use Uintp;
-
-package Restrict is
-
- type Restriction_Id is new Rident.Restriction_Id;
- -- The type Restriction_Id defines the set of restriction identifiers,
- -- which take no parameter (i.e. they are either present or not present).
- -- The actual definition is in the separate package Rident, so that it
- -- can easily be accessed by the binder without dragging in lots of stuff.
-
- subtype Partition_Restrictions is
- Restriction_Id range
- Restriction_Id (Rident.Partition_Restrictions'First) ..
- Restriction_Id (Rident.Partition_Restrictions'Last);
- -- Range of restriction identifiers that are checked by the binder
-
- subtype Compilation_Unit_Restrictions is
- Restriction_Id range
- Restriction_Id (Rident.Compilation_Unit_Restrictions'First) ..
- Restriction_Id (Rident.Compilation_Unit_Restrictions'Last);
- -- Range of restriction identifiers not checked by binder
-
- type Restriction_Parameter_Id is new Rident.Restriction_Parameter_Id;
- -- The type Restriction_Parameter_Id records cases where a parameter is
- -- present in the corresponding pragma. These cases are not checked for
- -- consistency by the binder. The actual definition is in the separate
- -- package Rident for consistency.
-
- type Restrictions_Flags is array (Restriction_Id) of Boolean;
- -- Type used for arrays indexed by Restriction_Id.
-
- Restrictions : Restrictions_Flags := (others => False);
- -- Corresponding entry is False if restriction is not active, and
- -- True if the restriction is active, i.e. if a pragma Restrictions
- -- has been seen anywhere. Note that we are happy to pick up any
- -- restrictions pragmas in with'ed units, since we are required to
- -- be consistent at link time, and we might as well find the error
- -- at compile time. Clients must NOT use this array for checking to
- -- see if a restriction is violated, instead it is required that the
- -- Check_Restrictions subprograms be used for this purpose. The only
- -- legitimate direct use of this array is when the code is modified
- -- as a result of the restriction in some way.
-
- Restrictions_Loc : array (Restriction_Id) of Source_Ptr;
- -- Locations of Restrictions pragmas for error message purposes.
- -- Valid only if corresponding entry in Restrictions is set.
-
- Main_Restrictions : Restrictions_Flags := (others => False);
- -- This variable saves the cumulative restrictions in effect compiling
- -- any unit that is part of the extended main unit (i.e. the compiled
- -- unit, its spec if any, and its subunits if any). The reason we keep
- -- track of this is for the information that goes to the binder about
- -- restrictions that are set. The binder will identify a unit that has
- -- a restrictions pragma for error message purposes, and we do not want
- -- to pick up a restrictions pragma in a with'ed unit for this purpose.
-
- Violations : Restrictions_Flags := (others => False);
- -- Corresponding entry is False if the restriction has not been
- -- violated in the current main unit, and True if it has been violated.
-
- Restriction_Parameters :
- array (Restriction_Parameter_Id) of Uint := (others => No_Uint);
- -- This array indicates the setting of restriction parameter identifier
- -- values. All values are initially set to No_Uint indicating that the
- -- parameter is not set, and are set to the appropriate non-negative
- -- value if a Restrictions pragma specifies the corresponding
- -- restriction parameter identifier with an appropriate value.
-
- Restriction_Parameters_Loc :
- array (Restriction_Parameter_Id) of Source_Ptr;
- -- Locations of Restrictions pragmas for error message purposes.
- -- Valid only if corresponding entry in Restriction_Parameters is
- -- set to a value other than No_Uint.
-
- type Unit_Entry is record
- Res_Id : Restriction_Id;
- Filenm : String (1 .. 8);
- end record;
-
- type Unit_Array_Type is array (Positive range <>) of Unit_Entry;
-
- Unit_Array : constant Unit_Array_Type := (
- (No_Asynchronous_Control, "a-astaco"),
- (No_Calendar, "a-calend"),
- (No_Calendar, "calendar"),
- (No_Delay, "a-calend"),
- (No_Delay, "calendar"),
- (No_Dynamic_Priorities, "a-dynpri"),
- (No_IO, "a-direio"),
- (No_IO, "directio"),
- (No_IO, "a-sequio"),
- (No_IO, "sequenio"),
- (No_IO, "a-ststio"),
- (No_IO, "a-textio"),
- (No_IO, "text_io "),
- (No_IO, "a-witeio"),
- (No_Task_Attributes, "a-tasatt"),
- (No_Streams, "a-stream"),
- (No_Unchecked_Conversion, "a-unccon"),
- (No_Unchecked_Conversion, "unchconv"),
- (No_Unchecked_Deallocation, "a-uncdea"),
- (No_Unchecked_Deallocation, "unchdeal"));
- -- This array defines the mapping between restriction identifiers and
- -- predefined language files containing units for which the identifier
- -- forbids semantic dependence.
-
- type Save_Compilation_Unit_Restrictions is private;
- -- Type used for saving and restoring compilation unit restrictions.
- -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
-
- -----------------
- -- Subprograms --
- -----------------
-
- procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id);
- -- Checks if loading of unit U is prohibited by the setting of some
- -- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO).
- -- If a restriction exists post error message at the given node.
-
- procedure Check_Restriction (R : Restriction_Id; N : Node_Id);
- -- Checks that the given restriction is not set, and if it is set, an
- -- appropriate message is posted on the given node. Also records the
- -- violation in the violations array. Note that it is mandatory to
- -- always use this routine to check if a restriction is violated. Such
- -- checks must never be done directly by the caller, since otherwise
- -- they are not properly recorded in the violations array.
-
- procedure Check_Restriction
- (R : Restriction_Parameter_Id;
- N : Node_Id);
- -- Checks that the given restriction parameter identifier is not set to
- -- zero. If it is set to zero, then the node N is replaced by a node
- -- that raises Storage_Error, and a warning is issued.
-
- procedure Check_Restriction
- (R : Restriction_Parameter_Id;
- V : Uint;
- N : Node_Id);
- -- Checks that the count in V does not exceed the maximum value of the
- -- restriction parameter value corresponding to the given restriction
- -- parameter identifier (if it has been set). If the count in V exceeds
- -- the maximum, then post an error message on node N.
-
- procedure Check_Elaboration_Code_Allowed (N : Node_Id);
- -- Tests to see if elaboration code is allowed by the current restrictions
- -- settings. This function is called by Gigi when it needs to define
- -- an elaboration routine. If elaboration code is not allowed, an error
- -- message is posted on the node given as argument.
-
- function No_Exception_Handlers_Set return Boolean;
- -- Test to see if current restrictions settings specify that no exception
- -- handlers are present. This function is called by Gigi when it needs to
- -- expand an AT END clean up identifier with no exception handler.
-
- function Compilation_Unit_Restrictions_Save
- return Save_Compilation_Unit_Restrictions;
- -- This function saves the compilation unit restriction settings, and
- -- resets them to False. This is used e.g. when compiling a with'ed
- -- unit to avoid incorrectly propagating restrictions. Note that it
- -- would not be wrong to also save and reset the partition restrictions,
- -- since the binder would catch inconsistencies, but actually it is a
- -- good thing to acquire restrictions from with'ed units if they are
- -- required to be partition wide, because it allows the restriction
- -- violation message to be given at compile time instead of link time.
-
- procedure Compilation_Unit_Restrictions_Restore
- (R : Save_Compilation_Unit_Restrictions);
- -- This is the corresponding restore procedure to restore restrictions
- -- previously saved by Compilation_Unit_Restrictions_Save.
-
- procedure Disallow_In_No_Run_Time_Mode (Enode : Node_Id);
- -- If in No_Run_Time mode, then the construct represented by Enode is
- -- not permitted, and will be appropriately flagged.
-
- procedure Set_No_Run_Time_Mode;
- -- Set the no run time mode, and associated restriction pragmas.
-
- function Get_Restriction_Id
- (N : Name_Id)
- return Restriction_Id;
- -- Given an identifier name, determines if it is a valid restriction
- -- identifier, and if so returns the corresponding Restriction_Id
- -- value, otherwise returns Not_A_Restriction_Id.
-
- function Get_Restriction_Parameter_Id
- (N : Name_Id)
- return Restriction_Parameter_Id;
- -- Given an identifier name, determines if it is a valid restriction
- -- parameter identifier, and if so returns the corresponding
- -- Restriction_Parameter_Id value, otherwise returns
- -- Not_A_Restriction_Parameter_Id.
-
- function Abort_Allowed return Boolean;
- pragma Inline (Abort_Allowed);
- -- Tests to see if abort is allowed by the current restrictions settings.
- -- For abort to be allowed, either No_Abort_Statements must be False,
- -- or Max_Asynchronous_Select_Nesting must be non-zero.
-
- function Restricted_Profile return Boolean;
- -- Tests to see if tasking operations follow the GNAT restricted run time
- -- profile.
-
- procedure Set_Ravenscar;
- -- Sets the set of rerstrictions fro Ravenscar
-
- procedure Set_Restricted_Profile;
- -- Sets the set of restrictions for pragma Restricted_Run_Time
-
- function Tasking_Allowed return Boolean;
- pragma Inline (Tasking_Allowed);
- -- Tests to see if tasking operations are allowed by the current
- -- restrictions settings. For tasking to be allowed Max_Tasks must
- -- be non-zero.
-
-private
- type Save_Compilation_Unit_Restrictions is
- array (Compilation_Unit_Restrictions) of Boolean;
- -- Type used for saving and restoring compilation unit restrictions.
- -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
-
-end Restrict;
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