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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- E X P _ C H 9 --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-1999 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. --
--- --
-------------------------------------------------------------------------------
-
--- Expand routines for chapter 9 constructs
-
-with Types; use Types;
-
-package Exp_Ch9 is
-
- procedure Add_Discriminal_Declarations
- (Decls : List_Id;
- Typ : Entity_Id;
- Name : Name_Id;
- Loc : Source_Ptr);
- -- This routine is used to add discriminal declarations to task and
- -- protected operation bodies. The discriminants are available by normal
- -- selection from the concurrent object (whose name is passed as the third
- -- parameter). Discriminant references inside the body have already
- -- been replaced by references to the corresponding discriminals. The
- -- declarations constructed by this procedure hook the references up with
- -- the objects:
- --
- -- discriminal_name : discr_type renames name.discriminant_name;
- --
- -- Obviously we could have expanded the discriminant references in the
- -- first place to be the appropriate selection, but this turns out to
- -- be hard to do because it would introduce difference in handling of
- -- discriminant references depending on their location.
-
- procedure Add_Private_Declarations
- (Decls : List_Id;
- Typ : Entity_Id;
- Name : Name_Id;
- Loc : Source_Ptr);
- -- This routine is used to add private declarations to protected bodies.
- -- These are analogous to the discriminal declarations added to tasks
- -- and protected operations, and consist of a renaming of each private
- -- object to a selection from the concurrent object passed as an extra
- -- parameter to each such operation:
- -- private_name : private_type renames name.private_name;
- -- As with discriminals, private references inside the protected
- -- subprogram bodies have already been replaced by references to the
- -- corresponding privals.
-
- procedure Build_Activation_Chain_Entity (N : Node_Id);
- -- Given a declaration N of an object that is a task, or contains tasks
- -- (other than allocators to tasks) this routine ensures that an activation
- -- chain has been declared in the appropriate scope, building the required
- -- declaration for the chain variable if not. The name of this variable
- -- is always _Chain and it is accessed by name. This procedure also adds
- -- an appropriate call to Activate_Tasks to activate the tasks for this
- -- activation chain. It does not however deal with the call needed in the
- -- case of allocators to Expunge_Unactivated_Tasks, this is separately
- -- handled in the Expand_Task_Allocator routine.
-
- function Build_Call_With_Task (N : Node_Id; E : Entity_Id) return Node_Id;
- -- N is a node representing the name of a task or an access to a task.
- -- The value returned is a call to the function whose name is the entity
- -- E (typically a runtime routine entity obtained using RTE) with the
- -- Task_Id of the associated task as the parameter. The caller is
- -- responsible for analyzing and resolving the resulting tree.
-
- procedure Build_Master_Entity (E : Entity_Id);
- -- Given an entity E for the declaration of an object containing tasks
- -- or of a type declaration for an allocator whose designated type is a
- -- task or contains tasks, this routine marks the appropriate enclosing
- -- context as a master, and also declares a variable called _Master in
- -- the current declarative part which captures the value of Current_Master
- -- (if not already built by a prior call). We build this object (instead
- -- of just calling Current_Master) for two reasons. First it is clearly
- -- more efficient to call Current_Master only once for a bunch of tasks
- -- in the same declarative part, and second it makes things easier in
- -- generating the initialization routines, since they can just reference
- -- the object _Master by name, and they will get the proper Current_Master
- -- value at the outer level, and copy in the parameter value for the outer
- -- initialization call if the call is for a nested component). Note that
- -- in the case of nested packages, we only really need to make one such
- -- object at the outer level, but it is much easier to generate one per
- -- declarative part.
-
- function Build_Protected_Sub_Specification
- (N : Node_Id;
- Prottyp : Entity_Id;
- Unprotected : Boolean := False)
- return Node_Id;
- -- Build specification for protected subprogram. This is called when
- -- expanding a protected type, and also when expanding the declaration for
- -- an Access_To_Protected_Subprogram type. In the latter case, Prottyp is
- -- empty, and the first parameter of the signature of the protected op is
- -- of type System.Address.
-
- procedure Build_Protected_Subprogram_Call
- (N : Node_Id;
- Name : Node_Id;
- Rec : Node_Id;
- External : Boolean := True);
- -- The node N is a subprogram or entry call to a protected subprogram.
- -- This procedure rewrites this call with the appropriate expansion.
- -- Name is the subprogram, and Rec is the record corresponding to the
- -- protected object. External is False if the call is to another
- -- protected subprogram within the same object.
-
- procedure Build_Task_Activation_Call (N : Node_Id);
- -- This procedure is called for constructs that can be task activators
- -- i.e. task bodies, subprogram bodies, package bodies and blocks. If
- -- the construct is a task activator (as indicated by the non-empty
- -- setting of Activation_Chain_Entity, either in the construct, or, in
- -- the case of a package body, in its associated package spec), then
- -- a call to Activate_Tasks with this entity as the single parameter
- -- is inserted at the start of the statements of the activator.
-
- procedure Build_Task_Allocate_Block
- (Actions : List_Id;
- N : Node_Id;
- Args : List_Id);
- -- This routine is used in the case of allocators where the designated
- -- type is a task or contains tasks. In this case, the normal initialize
- -- call is replaced by:
- --
- -- blockname : label;
- -- blockname : declare
- -- _Chain : Activation_Chain;
- --
- -- procedure _Expunge is
- -- begin
- -- Expunge_Unactivated_Tasks (_Chain);
- -- end;
- --
- -- begin
- -- Init (Args);
- -- Activate_Tasks (_Chain);
- -- at end
- -- _Expunge;
- -- end;
- --
- -- to get the task or tasks created and initialized. The expunge call
- -- ensures that any tasks that get created but not activated due to an
- -- exception are properly expunged (it has no effect in the normal case)
- -- The argument N is the allocator, and Args is the list of arguments
- -- for the initialization call, constructed by the caller, which uses
- -- the Master_Id of the access type as the _Master parameter, and _Chain
- -- (defined above) as the _Chain parameter.
-
- function Concurrent_Ref (N : Node_Id) return Node_Id;
- -- Given the name of a concurrent object (task or protected object), or
- -- the name of an access to a concurrent object, this function returns an
- -- expression referencing the associated Task_Id or Protection object,
- -- respectively. Note that a special case is when the name is a reference
- -- to a task type name. This can only happen within a task body, and the
- -- meaning is to get the Task_Id for the currently executing task.
-
- function Convert_Concurrent
- (N : Node_Id;
- Typ : Entity_Id)
- return Node_Id;
- -- N is an expression of type Typ. If the type is not a concurrent
- -- type then it is returned unchanged. If it is a task or protected
- -- reference, Convert_Concurrent creates an unchecked conversion node
- -- from this expression to the corresponding concurrent record type
- -- value. We need this in any situation where the concurrent type is
- -- used, because the actual concurrent object is an object of the
- -- corresponding concurrent type, and manipulations on the concurrent
- -- object actually manipulate the corresponding object of the record
- -- type.
-
- function Entry_Index_Expression
- (Sloc : Source_Ptr;
- Ent : Entity_Id;
- Index : Node_Id;
- Ttyp : Entity_Id)
- return Node_Id;
- -- Returns an expression to compute a task entry index given the name
- -- of the entry or entry family. For the case of a task entry family,
- -- the Index parameter contains the expression for the subscript.
- -- Ttyp is the task type.
-
- procedure Establish_Task_Master (N : Node_Id);
- -- Given a subprogram body, or a block statement, or a task body, this
- -- proccedure makes the necessary transformations required of a task
- -- master (add Enter_Master call at start, and establish a cleanup
- -- routine to make sure Complete_Master is called on exit).
-
- procedure Expand_Access_Protected_Subprogram_Type (N : Node_Id);
- -- Build Equivalent_Type for an Access_to_protected_Subprogram.
-
- procedure Expand_Accept_Declarations (N : Node_Id; Ent : Entity_Id);
- -- Expand declarations required for accept statement. See bodies of
- -- both Expand_Accept_Declarations and Expand_N_Accept_Statement for
- -- full details of the nature and use of these declarations, which
- -- are inserted immediately before the accept node N. The second
- -- argument is the entity for the corresponding entry.
-
- procedure Expand_Entry_Barrier (N : Node_Id; Ent : Entity_Id);
- -- Expand the entry barrier into a function. This is called directly
- -- from Analyze_Entry_Body so that the discriminals and privals of the
- -- barrier can be attached to the function declaration list, and a new
- -- set prepared for the entry body procedure, bedore the entry body
- -- statement sequence can be expanded. The resulting function is analyzed
- -- now, within the context of the protected object, to resolve calls to
- -- other protected functions.
-
- procedure Expand_Entry_Body_Declarations (N : Node_Id);
- -- Expand declarations required for the expansion of the
- -- statements of the body.
-
- procedure Expand_N_Abort_Statement (N : Node_Id);
- procedure Expand_N_Accept_Statement (N : Node_Id);
- procedure Expand_N_Asynchronous_Select (N : Node_Id);
- procedure Expand_N_Conditional_Entry_Call (N : Node_Id);
- procedure Expand_N_Delay_Relative_Statement (N : Node_Id);
- procedure Expand_N_Delay_Until_Statement (N : Node_Id);
- procedure Expand_N_Entry_Body (N : Node_Id);
- procedure Expand_N_Entry_Call_Statement (N : Node_Id);
- procedure Expand_N_Entry_Declaration (N : Node_Id);
- procedure Expand_N_Protected_Body (N : Node_Id);
-
- procedure Expand_N_Protected_Type_Declaration (N : Node_Id);
- -- Expands protected type declarations. This results, among
- -- other things, in the declaration of a record type for the
- -- representation of protected objects and (if there are entries)
- -- in an entry service procedure. The Protection value used by
- -- the GNARL to control the object will always be the first
- -- field of the record, and the entry service procedure spec
- -- (if it exists) will always immediately follow the record
- -- declaration. This allows these two nodes to be found from
- -- the type using Corresponding_Record, without benefit of
- -- of further attributes.
-
- procedure Expand_N_Requeue_Statement (N : Node_Id);
- procedure Expand_N_Selective_Accept (N : Node_Id);
- procedure Expand_N_Single_Task_Declaration (N : Node_Id);
- procedure Expand_N_Task_Body (N : Node_Id);
- procedure Expand_N_Task_Type_Declaration (N : Node_Id);
- procedure Expand_N_Timed_Entry_Call (N : Node_Id);
-
- procedure Expand_Protected_Body_Declarations
- (N : Node_Id;
- Spec_Id : Entity_Id);
- -- Expand declarations required for a protected body. See bodies of
- -- both Expand_Protected_Body_Declarations and Expand_N_Protected_Body
- -- for full details of the nature and use of these declarations.
- -- The second argument is the entity for the corresponding
- -- protected type declaration.
-
- function External_Subprogram (E : Entity_Id) return Entity_Id;
- -- return the external version of a protected operation, which locks
- -- the object before invoking the internal protected subprogram body.
-
- function First_Protected_Operation (D : List_Id) return Node_Id;
- -- Given the declarations list for a protected body, find the
- -- first protected operation body.
-
- function Make_Task_Create_Call (Task_Rec : Entity_Id) return Node_Id;
- -- Given the entity of the record type created for a task type, build
- -- the call to Create_Task
-
- function Make_Initialize_Protection
- (Protect_Rec : Entity_Id)
- return List_Id;
- -- Given the entity of the record type created for a protected type, build
- -- a list of statements needed for proper initialization of the object.
-
- function Next_Protected_Operation (N : Node_Id) return Node_Id;
- -- Given a protected operation node (a subprogram or entry body),
- -- find the following node in the declarations list.
-
- procedure Set_Discriminals
- (Dec : Node_Id;
- Op : Node_Id;
- Loc : Source_Ptr);
- -- Replace discriminals in a protected type for use by the
- -- next protected operation on the type. Each operation needs a
- -- new set of discirminals, since it needs a unique renaming of
- -- the discriminant fields in the record used to implement the
- -- protected type.
-
- procedure Set_Privals
- (Dec : Node_Id;
- Op : Node_Id;
- Loc : Source_Ptr);
- -- Associates a new set of privals (placeholders for later access to
- -- private components of protected objects) with the private object
- -- declarations of a protected object. These will be used to expand
- -- the references to private objects in the next protected
- -- subprogram or entry body to be expanded.
-
-end Exp_Ch9;
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