-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, 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- --
+-- 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 COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- 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. --
-- Expand routines for chapter 9 constructs
-with Namet; use Namet;
with Types; use Types;
package Exp_Ch9 is
-- This type is used to distinguish the different protection modes of a
-- protected subprogram.
- 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- -- been replaced by references to the corresponding discriminals.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
-- Task_Id of the associated task as the parameter. The caller is
-- responsible for analyzing and resolving the resulting tree.
- function Build_Corresponding_Record
- (N : Node_Id;
- Ctyp : Node_Id;
- Loc : Source_Ptr) return Node_Id;
- -- Common to tasks and protected types. Copy discriminant specifications,
- -- build record declaration. N is the type declaration, Ctyp is the
- -- concurrent entity (task type or protected type).
+ function Build_Entry_Names (Conc_Typ : Entity_Id) return Node_Id;
+ -- Create the statements which populate the entry names array of a task or
+ -- protected type. The statements are wrapped inside a block due to a local
+ -- declaration.
procedure Build_Master_Entity (E : Entity_Id);
-- Given an entity E for the declaration of an object containing tasks
-- object at the outer level, but it is much easier to generate one per
-- declarative part.
+ function Build_Private_Protected_Declaration (N : Node_Id) return Entity_Id;
+ -- A subprogram body without a previous spec that appears in a protected
+ -- body must be expanded separately to create a subprogram declaration
+ -- for it, in order to resolve internal calls to it from other protected
+ -- operations. It would seem that no locking version of the operation is
+ -- needed, but in fact, in Ada 2005 the subprogram may be used in a call-
+ -- back, and therefore a protected version of the operation must be
+ -- generated as well.
+
function Build_Protected_Sub_Specification
- (N : Node_Id;
- Prottyp : Entity_Id;
- Mode : Subprogram_Protection_Mode) return Node_Id;
- -- Build specification for protected subprogram. This is called when
+ (N : Node_Id;
+ Prot_Typ : Entity_Id;
+ Mode : Subprogram_Protection_Mode) return Node_Id;
+ -- Build the 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
+ -- an Access_To_Protected_Subprogram type. In the latter case, Prot_Typ is
-- empty, and the first parameter of the signature of the protected op is
-- of type System.Address.
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.
+ -- 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.
+ -- 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:
+ -- 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
--
-- 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
+ -- 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.
procedure Build_Task_Allocate_Block_With_Init_Stmts
-- aggregate. It replaces the call to Init (Args) done by
-- Build_Task_Allocate_Block.
+ function Build_Wrapper_Spec
+ (Subp_Id : Entity_Id;
+ Obj_Typ : Entity_Id;
+ Formals : List_Id) return Node_Id;
+ -- Ada 2005 (AI-345): Build the specification of a primitive operation
+ -- associated with a protected or task type. This is required to implement
+ -- dispatching calls through interfaces. Subp_Id is the primitive to be
+ -- wrapped, Obj_Typ is the type of the newly added formal parameter to
+ -- handle object notation, Formals are the original entry formals that
+ -- will be explicitly replicated.
+
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
-- 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.
+ (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;
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.
+ -- 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 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
+ -- Build Equivalent_Type for an Access_To_Protected_Subprogram.
+ -- Equivalent_Type is a record type with two components: a pointer to the
+ -- protected object, and a pointer to the operation itself.
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.
+ -- 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
+ -- set prepared for the entry body procedure, before 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_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.
+ -- 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 Find_Master_Scope (E : Entity_Id) return Entity_Id;
+ -- When a type includes tasks, a master entity is created in the scope, to
+ -- be used by the runtime during activation. In general the master is the
+ -- immediate scope in which the type is declared, but in Ada2005, in the
+ -- presence of synchronized classwide interfaces, the immediate scope of
+ -- an anonymous access type may be a transient scope, which has no run-time
+ -- presence. In this case, the scope of the master is the innermost scope
+ -- that comes from source.
+
function First_Protected_Operation (D : List_Id) return Node_Id;
-- Given the declarations list for a protected body, find the
-- first protected operation body.
+ procedure Install_Private_Data_Declarations
+ (Loc : Source_Ptr;
+ Spec_Id : Entity_Id;
+ Conc_Typ : Entity_Id;
+ Body_Nod : Node_Id;
+ Decls : List_Id;
+ Barrier : Boolean := False;
+ Family : Boolean := False);
+ -- This routines generates several types, objects and object renamings used
+ -- in the handling of discriminants and private components of protected and
+ -- task types. It also generates the entry index for entry families. Formal
+ -- Spec_Id denotes an entry, entry family or a subprogram, Conc_Typ is the
+ -- concurrent type where Spec_Id resides, Body_Nod is the corresponding
+ -- body of Spec_Id, Decls are the declarations of the subprogram or entry.
+ -- Flag Barrier denotes whether the context is an entry barrier function.
+ -- Flag Family is used in conjunction with Barrier to denote a barrier for
+ -- an entry family.
+ --
+ -- The generated types, entities and renamings are:
+ --
+ -- * If flag Barrier is set or Spec_Id denotes a protected entry or an
+ -- entry family, generate:
+ --
+ -- type prot_typVP is access prot_typV;
+ -- _object : prot_typVP := prot_typV (_O);
+ --
+ -- where prot_typV is the corresponding record of a protected type and
+ -- _O is a formal parameter representing the concurrent object of either
+ -- the barrier function or the entry (family).
+ --
+ -- * If Conc_Typ is a protected type, create a renaming for the Protection
+ -- field _object:
+ --
+ -- conc_typR : protection_typ renames _object._object;
+ --
+ -- * If Conc_Typ has discriminants, create renamings of the form:
+ --
+ -- discr_nameD : discr_typ renames _object.discr_name;
+ -- or
+ -- discr_nameD : discr_typ renames _task.discr_name;
+ --
+ -- * If Conc_Typ denotes a protected type and has private components,
+ -- generate renamings of the form:
+ --
+ -- comp_name : comp_typ renames _object.comp_name;
+ --
+ -- * Finally, is flag Barrier and Family are set or Spec_Id denotes an
+ -- entry family, generate the entry index constant:
+ --
+ -- subtype Jnn is <Type of Index> range Low .. High;
+ -- J : constant Jnn :=
+ -- Jnn'Val (_E - <Index expression> + Jnn'Pos (Jnn'First));
+ --
+ -- All the above declarations are inserted in the order shown to the front
+ -- of Decls.
+
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;
+ (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.
+ -- Given a protected operation node (a subprogram or entry body), find the
+ -- following node in the declarations list.
procedure Set_Discriminals (Dec : Node_Id);
- -- 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;
- After_Barrier : Boolean := False);
- -- 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.
- --
- -- The flag After_Barrier indicates whether this is called after building
- -- the barrier function for an entry body. This flag determines whether
- -- the privals should have source names (which simplifies debugging) or
- -- internally generated names. Entry barriers contain no debuggable code,
- -- and there may be visibility conflicts between an entry index and a
- -- a prival, so privals for barrier function have internal names.
+ -- Replace discriminals in a protected type for use by the next protected
+ -- operation on the type. Each operation needs a new set of discriminals,
+ -- since it needs a unique renaming of the discriminant fields in the
+ -- record used to implement the protected type.
end Exp_Ch9;
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