-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2004 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- --
-- This package deals with the implementation of the Restrictions pragma
-with Rident;
+with Rident; use 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 All_Restrictions is
- Restriction_Id range
- Restriction_Id (Rident.All_Restrictions'First) ..
- Restriction_Id (Rident.All_Restrictions'Last);
- -- All restriction identifiers
-
- 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. 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_Restriction 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 :=
+ Restrictions : Restrictions_Info;
+ -- This variable records restrictions found in any units in the main
+ -- extended unit, and in the case of restrictions checked for partition
+ -- consistency, restrictions found in any with'ed units, parent specs
+ -- etc, since we may as well check as much as we can at compile time.
+ -- These variables should not be referenced directly by clients. Instead
+ -- use Check_Restrictions to record a violation of a restriction, and
+ -- Restriction_Active to test if a given restriction is active.
+
+ Restrictions_Loc : array (All_Restrictions) of Source_Ptr :=
(others => No_Location);
-- Locations of Restrictions pragmas for error message purposes.
-- Valid only if corresponding entry in Restrictions is set. A value
-- pragma, and a value of System_Location is used for restrictions
-- set from package Standard by the processing in Targparm.
- 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.
+ Main_Restrictions : Restrictions_Info;
+ -- This variable records only restrictions found in any units of the
+ -- main extended unit. These are the variables used for ali file output,
+ -- since we want the binder to be able to accurately diagnose inter-unit
+ -- restriction violations.
- Restriction_Warnings : Restrictions_Flags := (others => False);
+ Restriction_Warnings : Rident.Restriction_Flags;
-- If one of these flags is set, then it means that violation of the
-- corresponding restriction results only in a warning message, not
-- in an error message, and the restriction is not otherwise enforced.
+ -- Note that the flags in Restrictions are set to indicate that the
+ -- restriction is set in this case, but Main_Restrictions is never
+ -- set if Restriction_Warnings is set, so this does not look like a
+ -- restriction to the binder.
- 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.
+ type Save_Cunit_Boolean_Restrictions is private;
+ -- Type used for saving and restoring compilation unit restrictions.
+ -- See Cunit_Boolean_Restrictions_[Save|Restore] subprograms.
- 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.
+ -- The following declarations establish a mapping between restriction
+ -- identifiers, and the names of corresponding restriction library units.
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_Finalization, "a-finali"),
- (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.
+ Unit_Array : constant array (Positive range <>) of Unit_Entry := (
+ (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_Finalization, "a-finali"),
+ (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_Package, "a-tasatt"),
+ (No_Streams, "a-stream"),
+ (No_Unchecked_Conversion, "a-unccon"),
+ (No_Unchecked_Conversion, "unchconv"),
+ (No_Unchecked_Deallocation, "a-uncdea"),
+ (No_Unchecked_Deallocation, "unchdeal"));
-- The following map has True for all GNAT pragmas. It is used to
-- implement pragma Restrictions (No_Implementation_Restrictions)
-- (which is why this restriction itself is excluded from the list).
- Implementation_Restriction : Restrictions_Flags :=
- (Boolean_Entry_Barriers => True,
+ Implementation_Restriction : array (All_Restrictions) of Boolean :=
+ (Simple_Barriers => True,
No_Calendar => True,
- No_Dynamic_Interrupts => True,
+ No_Dynamic_Attachment => True,
No_Enumeration_Maps => True,
No_Entry_Calls_In_Elaboration_Code => True,
No_Entry_Queue => True,
No_Local_Protected_Objects => True,
No_Protected_Type_Allocators => True,
No_Relative_Delay => True,
- No_Requeue => True,
+ No_Requeue_Statements => True,
No_Secondary_Stack => True,
No_Select_Statements => True,
No_Standard_Storage_Pools => True,
No_Streams => True,
- No_Task_Attributes => True,
+ No_Task_Attributes_Package => True,
No_Task_Termination => True,
No_Wide_Characters => True,
Static_Priorities => True,
-- 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);
+ procedure Check_Restriction
+ (R : Restriction_Id;
+ N : Node_Id;
+ V : Uint := Uint_Minus_1);
-- 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;
- 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. We use this call
- -- when we can tell the maximum usage at compile time. In other words,
- -- we guarantee that if a call is made to this routine, then the front
- -- end will make all necessary calls for the restriction parameter R
- -- to ensure that we really know the maximum value used anywhere.
-
- procedure Check_Restriction (R : Restriction_Parameter_Id; N : Node_Id);
- -- Check that the maximum value of the restriction parameter corresponding
- -- to the given restriction parameter identifier is not set to zero. If
- -- it has been set to zero, post an error message on node N. We use this
- -- call in cases where we can tell at compile time that the count must be
- -- at least one, but we can't tell anything more.
+ -- violation in the appropriate internal arrays. 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 violations in the absence of restrictions are not
+ -- properly recorded. The value of V is relevant only for parameter
+ -- restrictions, and in this case indicates the exact count for the
+ -- violation. If the exact count is not known, V is left at its
+ -- default value of -1 which indicates an unknown count.
procedure Check_Elaboration_Code_Allowed (N : Node_Id);
-- Tests to see if elaboration code is allowed by the current restrictions
-- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N).
-- Provided for easy use by back end, which has to check this restriction.
- function Compilation_Unit_Restrictions_Save
- return Save_Compilation_Unit_Restrictions;
+ function Cunit_Boolean_Restrictions_Save
+ return Save_Cunit_Boolean_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
-- 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);
+ procedure Cunit_Boolean_Restrictions_Restore
+ (R : Save_Cunit_Boolean_Restrictions);
-- This is the corresponding restore procedure to restore restrictions
- -- previously saved by Compilation_Unit_Restrictions_Save.
+ -- previously saved by Cunit_Boolean_Restrictions_Save.
function Get_Restriction_Id
- (N : Name_Id)
- return 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 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 Restricted_Profile return Boolean;
- -- Tests to see if tasking operations follow the GNAT restricted run time
- -- profile.
+ function Process_Restriction_Synonyms (N : Node_Id) return Name_Id;
+ -- Id is a node whose Chars field contains the name of a restriction.
+ -- If it is one of synonyms that we allow for historical purposes (for
+ -- list see System.Rident), then the proper official name is returned.
+ -- Otherwise the Chars field of the argument is returned unchanged.
+
+ function Restriction_Active (R : All_Restrictions) return Boolean;
+ pragma Inline (Restriction_Active);
+ -- Determines if a given restriction is active. This call should only be
+ -- used where the compiled code depends on whether the restriction is
+ -- active. Always use Check_Restriction to record a violation.
- procedure Set_Ravenscar (N : Node_Id);
- -- Enables the set of restrictions for Ravenscar. N is the corresponding
- -- pragma node, which is used for error messages on any constructs that
- -- violate the profile.
+ function Restricted_Profile return Boolean;
+ -- Tests if set of restrictions corresponding to Profile (Restricted) is
+ -- currently in effect (set by pragma Profile, or by an appropriate set
+ -- of individual Restrictions pragms). Returns True only if all the
+ -- required restrictions are set.
+
+ procedure Set_Profile_Restrictions
+ (P : Profile_Name;
+ N : Node_Id;
+ Warn : Boolean);
+ -- Sets the set of restrictions associated with the given profile
+ -- name. N is the node of the construct to which error messages
+ -- are to be attached as required. Warn is set True for the case
+ -- of Profile_Warnings where the restrictions are set as warnings
+ -- rather than legality requirements.
+
+ procedure Set_Restriction
+ (R : All_Boolean_Restrictions;
+ N : Node_Id);
+ -- N is a node (typically a pragma node) that has the effect of setting
+ -- Boolean restriction R. The restriction is set in Restrictions, and
+ -- also in Main_Restrictions if this is the main unit.
- procedure Set_Restricted_Profile (N : Node_Id);
- -- Enables the set of restrictions for pragma Restricted_Run_Time. N is
- -- the corresponding pragma node, which is used for error messages on
- -- constructs that violate the profile.
+ procedure Set_Restriction
+ (R : All_Parameter_Restrictions;
+ N : Node_Id;
+ V : Integer);
+ -- Similar to the above, except that this is used for the case of a
+ -- parameter restriction, and the corresponding value V is given.
function Tasking_Allowed return Boolean;
pragma Inline (Tasking_Allowed);
-- be non-zero.
private
- type Save_Compilation_Unit_Restrictions is
- array (Compilation_Unit_Restrictions) of Boolean;
+ type Save_Cunit_Boolean_Restrictions is
+ array (Cunit_Boolean_Restrictions) of Boolean;
-- Type used for saving and restoring compilation unit restrictions.
-- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
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