diff options
Diffstat (limited to 'gcc-4.8/gcc/ada/restrict.ads')
| -rw-r--r-- | gcc-4.8/gcc/ada/restrict.ads | 495 |
1 files changed, 0 insertions, 495 deletions
diff --git a/gcc-4.8/gcc/ada/restrict.ads b/gcc-4.8/gcc/ada/restrict.ads deleted file mode 100644 index 54702abd1..000000000 --- a/gcc-4.8/gcc/ada/restrict.ads +++ /dev/null @@ -1,495 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- R E S T R I C T -- --- -- --- S p e c -- --- -- --- Copyright (C) 1992-2012, 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 Namet; use Namet; -with Rident; use Rident; -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 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; - -- 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 restriction 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-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 pragmas. It is used to - -- implement pragma Restrictions (No_Implementation_Restrictions) - -- (which is why this restriction itself is excluded from the list). - - Implementation_Restriction : 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_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_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_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_Task_Attributes_Package => True, - No_Task_Termination => True, - No_Tasking => True, - No_Wide_Characters => True, - Static_Priorities => True, - Static_Storage_Size => True, - SPARK => True, - others => False); - - -- 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"); - - ------------------------------- - -- SPARK Restriction Control -- - ------------------------------- - - -- SPARK HIDE directives allow the effect of the SPARK restriction to be - -- turned off for a specified region of code, and the following tables are - -- the data structures used to keep track of these regions. - - -- The table contains pairs of source locations, the first being the start - -- location for hidden region, and the second being the end location. - - -- Note that the start location is included in the hidden region, while - -- the end location is excluded from it. (It typically corresponds to the - -- next token during scanning.) - - type SPARK_Hide_Entry is record - Start : Source_Ptr; - Stop : Source_Ptr; - end record; - - package SPARK_Hides is new Table.Table ( - Table_Component_Type => SPARK_Hide_Entry, - Table_Index_Type => Natural, - Table_Low_Bound => 1, - Table_Initial => 100, - Table_Increment => 200, - Table_Name => "SPARK Hides"); - - ----------------- - -- 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_Compiler_Unit (N : Node_Id); - -- If unit N is in a unit that has a pragma Compiler_Unit, then a message - -- is posted on node N noting use of a construct that is not permitted in - -- the compiler. - - 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 error message - -- (warning) will be issued if a restriction (warning) was previous set - -- for this aspect using Set_No_Specification_Of_Aspect. - - 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. - - procedure Check_SPARK_Restriction - (Msg : String; - N : Node_Id; - Force : Boolean := False); - -- Node N represents a construct not allowed in formal mode. If this is a - -- source node, or if the restriction is forced (Force = True), and the - -- SPARK restriction is set, then an error is issued on N. Msg is appended - -- to the restriction failure message. - - procedure Check_SPARK_Restriction (Msg1, Msg2 : String; N : Node_Id); - -- Same as Check_SPARK_Restriction except there is a continuation message - -- Msg2 following the initial message Msg1. - - 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. - - 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. - - 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 Is_In_Hidden_Part_In_SPARK (Loc : Source_Ptr) return Boolean; - -- Determine if given location is covered by a hidden region range in the - -- SPARK hides table. - - 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. - - function No_Exception_Propagation_Active return Boolean; - -- Test to see if current restrictions settings specify that no - -- exception propagation is activated. - - 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. 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 Profile (Restricted) 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_Hidden_Part_In_SPARK (Loc1, Loc2 : Source_Ptr); - -- Insert a new hidden region range in the SPARK hides table - - 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_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; - Warning : 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. - - 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. - - ---------------------------------------------- - -- 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 - -- then 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; |