| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- R E S T R I C T -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2022, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package deals with the implementation of the Restrictions pragma |
| |
| with Aspects; use Aspects; |
| with Namet; use Namet; |
| with Rident; use Rident; |
| with Snames; use Snames; |
| with Table; |
| with Types; use Types; |
| with Uintp; use Uintp; |
| |
| package Restrict is |
| |
| Restrictions : Restrictions_Info := No_Restrictions; |
| -- 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_Restriction 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 |
| -- of No_Location is used for implicit restrictions set by another |
| -- pragma, and a value of System_Location is used for restrictions |
| -- set from package Standard by the processing in Targparm. |
| |
| Restriction_Profile_Name : array (All_Restrictions) of Profile_Name; |
| -- Entries in this array are valid only if the corresponding restriction in |
| -- Restrictions is set. The value is the corresponding profile name if the |
| -- restriction was set by a Profile or Profile_Warnings pragma. The value |
| -- is No_Profile in all other cases. |
| |
| Main_Restrictions : Restrictions_Info := No_Restrictions; |
| -- 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 : Rident.Restriction_Flags := (others => False); |
| -- 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. |
| |
| -- The following declarations establish a mapping between restriction |
| -- identifiers, and the names of corresponding restricted library units. |
| |
| type Unit_Entry is record |
| Res_Id : Restriction_Id; |
| Filenm : String (1 .. 8); |
| end record; |
| |
| 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-direct"), |
| (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_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-defined Restrictions. It is used |
| -- to implement pragma Restrictions (No_Implementation_Restrictions) (which |
| -- is why this restriction itself is excluded from the list). |
| |
| Implementation_Restriction : constant array (All_Restrictions) of Boolean := |
| (Simple_Barriers => True, |
| No_Calendar => True, |
| No_Default_Initialization => True, |
| No_Direct_Boolean_Operators => True, |
| No_Dispatching_Calls => True, |
| No_Dynamic_Accessibility_Checks => True, |
| No_Dynamic_Attachment => True, |
| No_Elaboration_Code => True, |
| No_Enumeration_Maps => True, |
| No_Entry_Calls_In_Elaboration_Code => True, |
| No_Entry_Queue => True, |
| No_Exception_Handlers => True, |
| No_Exception_Propagation => True, |
| No_Exception_Registration => True, |
| No_Finalization => True, |
| No_Fixed_IO => True, |
| No_Implementation_Attributes => True, |
| No_Implementation_Pragmas => True, |
| No_Implicit_Conditionals => True, |
| No_Implicit_Aliasing => True, |
| No_Implicit_Dynamic_Code => True, |
| No_Implicit_Loops => True, |
| No_Initialize_Scalars => True, |
| No_Local_Protected_Objects => True, |
| No_Long_Long_Integers => True, |
| No_Multiple_Elaboration => True, |
| No_Protected_Type_Allocators => True, |
| No_Relative_Delay => True, |
| No_Requeue_Statements => True, |
| No_Secondary_Stack => True, |
| No_Select_Statements => True, |
| No_Standard_Storage_Pools => True, |
| No_Stream_Optimizations => True, |
| No_Streams => True, |
| No_Tagged_Type_Registration => True, |
| No_Task_Attributes_Package => True, |
| No_Task_Termination => True, |
| No_Tasking => True, |
| No_Wide_Characters => True, |
| Static_Priorities => True, |
| Static_Storage_Size => True, |
| Pure_Barriers => True, |
| SPARK_05 => True, |
| others => False); |
| |
| -------------------------- |
| -- No_Dependences Table -- |
| -------------------------- |
| |
| -- The following table records entries made by Restrictions pragmas |
| -- that specify a parameter for No_Dependence. Each such pragma makes |
| -- an entry in this table. |
| |
| -- Note: we have chosen to implement this restriction in the "syntactic" |
| -- form, where we do not check that the named package is a language defined |
| -- package, but instead we allow arbitrary package names. The discussion of |
| -- this issue is not complete in the ARG, but the sense seems to be leaning |
| -- in this direction, which makes more sense to us, since it is much more |
| -- useful, and much easier to implement. |
| |
| type ND_Entry is record |
| Unit : Node_Id; |
| -- The unit parameter from the No_Dependence pragma |
| |
| Warn : Boolean; |
| -- True if from Restriction_Warnings, False if from Restrictions |
| |
| Profile : Profile_Name; |
| -- Set to name of profile from which No_Dependence entry came, or to |
| -- No_Profile if a pragma Restriction set the No_Dependence entry. |
| end record; |
| |
| package No_Dependences is new Table.Table ( |
| Table_Component_Type => ND_Entry, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 0, |
| Table_Initial => 200, |
| Table_Increment => 200, |
| Table_Name => "Name_No_Dependences"); |
| |
| ---------------------------- |
| -- No_Use_Of_Entity Table -- |
| ---------------------------- |
| |
| -- The following table records entries made by Restrictions pragmas |
| -- that specify a parameter for No_Use_Of_Entity. Each such pragma makes |
| -- an entry in this table. |
| |
| -- Note: we have chosen to implement this restriction in the "syntactic" |
| -- form, where we allow arbitrary fully qualified names to be specified. |
| |
| type NE_Entry is record |
| Entity : Node_Id; |
| -- The entity parameter from the No_Use_Of_Entity pragma. This is in |
| -- the form of a selected component, since that is the way the parser |
| -- processes it, and we don't further analyze it. |
| |
| Warn : Boolean; |
| -- True if from Restriction_Warnings, False if from Restrictions |
| |
| Profile : Profile_Name; |
| -- Set to name of profile from which No_Use_Of_Entity entry came, or to |
| -- No_Profile if a pragma Restriction set the No_Use_Of_Entity entry. |
| end record; |
| |
| package No_Use_Of_Entity is new Table.Table ( |
| Table_Component_Type => NE_Entry, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 0, |
| Table_Initial => 200, |
| Table_Increment => 200, |
| Table_Name => "Name_No_Use_Of_Entity"); |
| |
| -- Note that in addition to making an entry in this table, we also set the |
| -- Boolean2 flag of the Name_Table entry for the simple name of the entity. |
| -- This is used to avoid most useless searches of this table. |
| |
| ----------------- |
| -- Subprograms -- |
| ----------------- |
| |
| -- Note: several of these subprograms can generate error messages (e.g. |
| -- Check_Restriction). These routines should be called in the analyzer |
| -- rather than the expander, so that the associated error messages are |
| -- correctly generated in semantics only (-gnatc) mode. |
| |
| 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. |
| |
| 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 |
| (Msg_Issued : out Boolean; |
| 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, in which case |
| -- Msg_Issued is set to True (and False otherwise). Also records the |
| -- 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 of -1 which indicates an unknown count. |
| |
| procedure Check_Restriction |
| (R : Restriction_Id; |
| N : Node_Id; |
| V : Uint := Uint_Minus_1); |
| -- Wrapper on Check_Restriction with Msg_Issued, with the out-parameter |
| -- being ignored here. |
| |
| procedure Check_Restriction_No_Dependence (U : Node_Id; Err : Node_Id); |
| -- Called when a dependence on a unit is created (either implicitly, or by |
| -- an explicit WITH clause). U is a node for the unit involved, and Err is |
| -- the node to which an error will be attached if necessary. |
| |
| procedure Check_Restriction_No_Specification_Of_Aspect (N : Node_Id); |
| -- N is the node id for an N_Aspect_Specification, an N_Pragma, or an |
| -- N_Attribute_Definition_Clause. An error message (warning) will be issued |
| -- if a restriction (warning) was previously set for this aspect using |
| -- Set_No_Specification_Of_Aspect. |
| |
| procedure Check_Restriction_No_Use_Of_Attribute (N : Node_Id); |
| -- N denotes an attribute definition clause or an attribute reference. An |
| -- error message (warning) will be issued if a restriction (warning) was |
| -- previously set for this attribute using Set_No_Use_Of_Attribute. |
| |
| procedure Check_Restriction_No_Use_Of_Entity (N : Node_Id); |
| -- N is the node id for an entity reference. An error message (warning) |
| -- will be issued if a restriction (warning) was previously set for this |
| -- entity name using Set_No_Use_Of_Entity. |
| |
| procedure Check_Restriction_No_Use_Of_Pragma (N : Node_Id); |
| -- N is the node of a pragma. An error message (warning) will be issued |
| -- if a restriction (warning) was previously set for this pragma using |
| -- Set_No_Use_Of_Pragma. |
| |
| 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. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| procedure Check_No_Implicit_Aliasing (Obj : Node_Id); |
| -- Obj is a node for which Is_Aliased_View is True, which is being used in |
| -- a context (e.g. 'Access) where no implicit aliasing is allowed if the |
| -- restriction No_Implicit_Aliasing is set. This procedure checks for the |
| -- case where the restriction is active and Obj does not meet the required |
| -- rules for avoiding implicit aliases, and issues a restriction message. |
| |
| procedure Check_Implicit_Dynamic_Code_Allowed (N : Node_Id); |
| -- Tests to see if dynamic code generation (dynamically generated |
| -- trampolines, in particular) is allowed by the current restrictions |
| -- settings. This function is called by Gigi when it needs to generate code |
| -- that generates a trampoline. If not allowed, an error message is posted |
| -- on the node given as argument. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| procedure Check_No_Implicit_Heap_Alloc (N : Node_Id); |
| -- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N). |
| -- Provided for easy use by back end, which has to check this restriction. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| procedure Check_No_Implicit_Protected_Alloc (N : Node_Id); |
| -- Equivalent to: |
| -- Check_Restriction (No_Implicit_Protected_Object_Allocations, N) |
| -- Provided for easy use by back end, which has to check this restriction. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| procedure Check_No_Implicit_Task_Alloc (N : Node_Id); |
| -- Equivalent to Check_Restriction (No_Implicit_Task_Allocations, N). |
| -- Provided for easy use by back end, which has to check this restriction. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| procedure Check_Obsolescent_2005_Entity (E : Entity_Id; N : Node_Id); |
| -- This routine checks if the entity E is one of the obsolescent entries |
| -- in Ada.Characters.Handling in Ada 2005 and No_Obsolescent_Features |
| -- restriction is active. If so an appropriate message is given. N is |
| -- the node on which the message is to be placed. It's a bit kludgy to |
| -- have this highly specialized routine rather than some wonderful general |
| -- mechanism (e.g. a special pragma) to handle this case, but there are |
| -- only six cases, and it is not worth the effort to do something general. |
| |
| procedure Check_Wide_Character_Restriction (E : Entity_Id; N : Node_Id); |
| -- This procedure checks if the No_Wide_Character restriction is active, |
| -- and if so, if N Comes_From_Source, and the root type of E is one of |
| -- [Wide_]Wide_Character or [Wide_]Wide_String, then the restriction |
| -- violation is recorded, and an appropriate message given. |
| |
| 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 OK_No_Dependence_Unit_Name (N : Node_Id) return Boolean; |
| -- Used in checking No_Dependence argument of pragma Restrictions or |
| -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns |
| -- True if N has the proper form for a unit name, False otherwise. |
| |
| function OK_No_Use_Of_Entity_Name (N : Node_Id) return Boolean; |
| -- Used in checking No_Use_Of_Entity argument of pragma Restrictions or |
| -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns |
| -- True if N has the proper form for an entity name, False otherwise. |
| |
| function No_Dynamic_Accessibility_Checks_Enabled |
| (N : Node_Id) return Boolean; |
| -- Test to see if the current restrictions settings specify that |
| -- No_Dynamic_Accessibility_Checks is activated. |
| |
| -- N is currently unused, but is reserved for future use and debugging |
| -- purposes to provide more context on a node for which an accessibility |
| -- check is being performed or generated (e.g. is N in a predefined unit). |
| |
| 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. True |
| -- will be returned if the configurable run-time is activated, and either |
| -- of the restrictions No_Exception_Handlers or No_Exception_Propagation is |
| -- set. In the latter case, the source may contain handlers but they either |
| -- get converted using the local goto transformation or deleted. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| function No_Exception_Propagation_Active return Boolean; |
| -- Test to see if current restrictions settings specify that no |
| -- exception propagation is activated. |
| |
| -- WARNING: There is a matching C declaration of this subprogram in fe.h |
| |
| 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. |
| |
| 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. Note that |
| -- this returns False if we only have a Restriction_Warnings set, since |
| -- restriction warnings should never affect generated code. If you want |
| -- to know if a call to Check_Restriction is needed then use the function |
| -- Restriction_Check_Required instead. |
| |
| function Restriction_Check_Required (R : All_Restrictions) return Boolean; |
| pragma Inline (Restriction_Check_Required); |
| -- Determines if either a Restriction_Warnings or Restrictions pragma has |
| -- been given for the specified restriction. If true, then a subsequent |
| -- call to Check_Restriction is required if the restriction is violated. |
| -- This must not be used to guard code generation that depends on whether |
| -- a restriction is active (see Restriction_Active above). Typically it |
| -- is used to avoid complex code to determine if a restriction is violated, |
| -- executing this code only if needed. |
| |
| function Restricted_Profile return Boolean; |
| -- Tests if set of restrictions corresponding to Restricted_Tasking profile |
| -- is currently in effect (set by pragma Profile, or by an appropriate set |
| -- of individual Restrictions pragmas). Returns True only if all the |
| -- required restrictions are set. |
| |
| procedure Set_Global_No_Tasking; |
| -- Used in call from Sem_Prag when restriction No_Tasking is set in the |
| -- run-time package System or in a configuration pragmas file. |
| |
| 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, and |
| -- is also True for Profile if the Treat_Restrictions_As_Warnings flag is |
| -- set. It is false for Profile if this flag is not set. |
| |
| 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_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. |
| |
| procedure Set_Restriction |
| (R : All_Restrictions; |
| N : Node_Id; |
| Warn : Boolean; |
| V : Integer := Integer'First); |
| -- Same as above two, except also takes care of setting the |
| -- Restriction_Warnings flag. V is ignored for Boolean |
| -- restrictions. |
| -- |
| -- If this is the first time we've seen this restriction, the warning flag |
| -- is set to Warn. If this is a second or subsequent time, Warn = False |
| -- wins; that is, errors always trump warnings. In that case, the warning |
| -- flag can be set to False, but never to True. |
| |
| procedure Set_Restriction_No_Dependence |
| (Unit : Node_Id; |
| Warn : Boolean; |
| Profile : Profile_Name := No_Profile); |
| -- Sets given No_Dependence restriction in table if not there already. Warn |
| -- is True if from Restriction_Warnings, or for Restrictions if the flag |
| -- Treat_Restrictions_As_Warnings is set. False if from Restrictions and |
| -- this flag is not set. Profile is set to a non-default value if the |
| -- No_Dependence restriction comes from a Profile pragma. |
| |
| procedure Set_Restriction_No_Specification_Of_Aspect |
| (N : Node_Id; |
| Warn : Boolean); |
| -- N is the node id for an identifier from a pragma Restrictions for the |
| -- No_Specification_Of_Aspect pragma. An error message will be issued if |
| -- the identifier is not a valid aspect name. Warning is set True for the |
| -- case of a Restriction_Warnings pragma specifying this restriction and |
| -- False for a Restrictions pragma specifying this restriction. |
| |
| procedure Set_Restriction_No_Specification_Of_Aspect (A_Id : Aspect_Id); |
| -- Version used by Get_Target_Parameters (via Tbuild) |
| |
| procedure Set_Restriction_No_Use_Of_Attribute |
| (N : Node_Id; |
| Warn : Boolean); |
| -- N is the node id for the identifier in a pragma Restrictions for |
| -- No_Use_Of_Attribute. Caller has verified that this is a valid attribute |
| -- designator. |
| |
| procedure Set_Restriction_No_Use_Of_Attribute (A_Id : Attribute_Id); |
| -- Version used by Get_Target_Parameters (via Tbuild) |
| |
| procedure Set_Restriction_No_Use_Of_Entity |
| (Entity : Node_Id; |
| Warn : Boolean; |
| Profile : Profile_Name := No_Profile); |
| -- Sets given No_Use_Of_Entity restriction in table if not there already. |
| -- Warn is True if from Restriction_Warnings, or for Restrictions if the |
| -- flag Treat_Restrictions_As_Warnings is set. False if from Restrictions |
| -- and this flag is not set. Profile is set to a non-default value if the |
| -- No_Dependence restriction comes from a Profile pragma. This procedure |
| -- also takes care of setting the Boolean2 flag of the simple name for |
| -- the entity (to optimize table searches). |
| |
| procedure Set_Restriction_No_Use_Of_Pragma |
| (N : Node_Id; |
| Warn : Boolean); |
| -- N is the node id for the identifier in a pragma Restrictions for |
| -- No_Use_Of_Pragma. Caller has verified that this is a valid pragma id. |
| |
| procedure Set_Restriction_No_Use_Of_Pragma (A_Id : Pragma_Id); |
| -- Version used in call from Get_Target_Parameters (via Tbuild). |
| |
| function Tasking_Allowed return Boolean; |
| pragma Inline (Tasking_Allowed); |
| -- Tests if tasking operations are allowed by the current restrictions |
| -- settings. For tasking to be allowed Max_Tasks must be non-zero. |
| |
| function Global_No_Tasking return Boolean; |
| -- Returns True if the restriction No_Tasking is set in the run-time |
| -- package System or in a configuration pragmas file. |
| |
| ---------------------------------------------- |
| -- Handling of Boolean Compilation Switches -- |
| ---------------------------------------------- |
| |
| -- The following declarations are used for proper saving and restoring of |
| -- restrictions for separate compilation units. There are two cases: |
| |
| -- For partition-wide restrictions, we just let the restrictions pragmas |
| -- pile up, and we never reset them. We might as well detect what we can |
| -- at compile time. If e.g. a with'ed unit has a restriction for one of |
| -- the partition-wide restrictions, then the binder will enforce it on |
| -- all units in the partition, including the unit with the WITH. Although |
| -- it would not be wrong to leave this till bind time, we might as well |
| -- flag it earlier at compile time. |
| |
| -- For non-partition-wide restrictions, we have quite a different state |
| -- of affairs. Here it would be quite wrong to carry a restriction from |
| -- a with'ed unit to another with'ed unit, or from a package spec to the |
| -- package body. This means that we have to reset these non-partition |
| -- wide restrictions at the start of each separate compilation unit. For |
| -- units in the extended main program, we need to reset them all to the |
| -- values set by the configuration pragma file(s). For units not in the |
| -- extended main program, e.g. with'ed units, we might as well reset all |
| -- of these restrictions to off (False). The actual initial values will |
| -- be taken from the config files active when those units are compiled |
| -- as main units. |
| |
| type Save_Cunit_Boolean_Restrictions is private; |
| -- Type used for saving and restoring compilation unit restrictions. |
| |
| function Cunit_Boolean_Restrictions_Save |
| return Save_Cunit_Boolean_Restrictions; |
| -- This function saves the compilation unit restriction settings, leaving |
| -- them unchanged. This is used e.g. at the start of processing a context |
| -- clause, so that the main unit restrictions can be restored after all |
| -- the with'ed units have been processed. |
| |
| procedure Cunit_Boolean_Restrictions_Restore |
| (R : Save_Cunit_Boolean_Restrictions); |
| -- This is the corresponding restore procedure to restore restrictions |
| -- previously saved by Cunit_Boolean_Restrictions_Save. However it does |
| -- not reset No_Elaboration_Code, this stays set if it was set before |
| -- the call, and also if it is set before the call, then the Config |
| -- setting is also updated to include this restriction. This is what |
| -- implements the special handling of No_Elaboration_Code. |
| |
| procedure Save_Config_Cunit_Boolean_Restrictions; |
| -- This saves the current compilation unit restrictions in an internal |
| -- variable, and leaves them unchanged. This is called immediately after |
| -- processing the configuration file pragmas, to record the restrictions |
| -- set by these configuration file pragmas. |
| |
| procedure Restore_Config_Cunit_Boolean_Restrictions; |
| -- This restores the value saved by the previous call to save config values |
| -- saved by Save_Config_Cunit_Boolean_Restrictions. It is called at the |
| -- start of processing a new unit that is part of the main sources (e.g. |
| -- a package spec when the main unit is a package body). |
| |
| procedure Reset_Cunit_Boolean_Restrictions; |
| -- Turns off all non-partition-wide boolean restrictions |
| |
| procedure Add_To_Config_Boolean_Restrictions (R : Restriction_Id); |
| -- Add specified restriction to stored configuration boolean restrictions. |
| -- This is used for handling the special case of No_Elaboration_Code. |
| |
| private |
| 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. |
| |
| end Restrict; |
