1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Checks; use Checks;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Exp_Ch3; use Exp_Ch3;
32 with Exp_Ch11; use Exp_Ch11;
33 with Exp_Ch6; use Exp_Ch6;
34 with Exp_Dbug; use Exp_Dbug;
35 with Exp_Disp; use Exp_Disp;
36 with Exp_Sel; use Exp_Sel;
37 with Exp_Smem; use Exp_Smem;
38 with Exp_Tss; use Exp_Tss;
39 with Exp_Util; use Exp_Util;
40 with Freeze; use Freeze;
42 with Itypes; use Itypes;
43 with Namet; use Namet;
44 with Nlists; use Nlists;
45 with Nmake; use Nmake;
47 with Restrict; use Restrict;
48 with Rident; use Rident;
49 with Rtsfind; use Rtsfind;
51 with Sem_Aux; use Sem_Aux;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Ch11; use Sem_Ch11;
55 with Sem_Elab; use Sem_Elab;
56 with Sem_Eval; use Sem_Eval;
57 with Sem_Res; use Sem_Res;
58 with Sem_Util; use Sem_Util;
59 with Sinfo; use Sinfo;
60 with Snames; use Snames;
61 with Stand; use Stand;
62 with Stringt; use Stringt;
63 with Targparm; use Targparm;
64 with Tbuild; use Tbuild;
65 with Uintp; use Uintp;
67 package body Exp_Ch9 is
69 -- The following constant establishes the upper bound for the index of
70 -- an entry family. It is used to limit the allocated size of protected
71 -- types with defaulted discriminant of an integer type, when the bound
72 -- of some entry family depends on a discriminant. The limitation to
73 -- entry families of 128K should be reasonable in all cases, and is a
74 -- documented implementation restriction. It will be lifted when protected
75 -- entry families are re-implemented as a single ordered queue.
77 Entry_Family_Bound : constant Int := 2**16;
79 -----------------------
80 -- Local Subprograms --
81 -----------------------
83 function Actual_Index_Expression
87 Tsk : Entity_Id) return Node_Id;
88 -- Compute the index position for an entry call. Tsk is the target task. If
89 -- the bounds of some entry family depend on discriminants, the expression
90 -- computed by this function uses the discriminants of the target task.
92 procedure Add_Object_Pointer
96 -- Prepend an object pointer declaration to the declaration list Decls.
97 -- This object pointer is initialized to a type conversion of the System.
98 -- Address pointer passed to entry barrier functions and entry body
101 procedure Add_Formal_Renamings
106 -- Create renaming declarations for the formals, inside the procedure that
107 -- implements an entry body. The renamings make the original names of the
108 -- formals accessible to gdb, and serve no other purpose.
109 -- Spec is the specification of the procedure being built.
110 -- Decls is the list of declarations to be enhanced.
111 -- Ent is the entity for the original entry body.
113 function Build_Accept_Body (Astat : Node_Id) return Node_Id;
114 -- Transform accept statement into a block with added exception handler.
115 -- Used both for simple accept statements and for accept alternatives in
116 -- select statements. Astat is the accept statement.
118 function Build_Barrier_Function
121 Pid : Node_Id) return Node_Id;
122 -- Build the function body returning the value of the barrier expression
123 -- for the specified entry body.
125 function Build_Barrier_Function_Specification
127 Def_Id : Entity_Id) return Node_Id;
128 -- Build a specification for a function implementing the protected entry
129 -- barrier of the specified entry body.
131 function Build_Entry_Count_Expression
132 (Concurrent_Type : Node_Id;
133 Component_List : List_Id;
134 Loc : Source_Ptr) return Node_Id;
135 -- Compute number of entries for concurrent object. This is a count of
136 -- simple entries, followed by an expression that computes the length
137 -- of the range of each entry family. A single array with that size is
138 -- allocated for each concurrent object of the type.
140 function Build_Parameter_Block
144 Decls : List_Id) return Entity_Id;
145 -- Generate an access type for each actual parameter in the list Actuals.
146 -- Create an encapsulating record that contains all the actuals and return
147 -- its type. Generate:
148 -- type Ann1 is access all <actual1-type>
150 -- type AnnN is access all <actualN-type>
151 -- type Pnn is record
157 procedure Build_Wrapper_Bodies
161 -- Ada 2005 (AI-345): Typ is either a concurrent type or the corresponding
162 -- record of a concurrent type. N is the insertion node where all bodies
163 -- will be placed. This routine builds the bodies of the subprograms which
164 -- serve as an indirection mechanism to overriding primitives of concurrent
165 -- types, entries and protected procedures. Any new body is analyzed.
167 procedure Build_Wrapper_Specs
171 -- Ada 2005 (AI-345): Typ is either a concurrent type or the corresponding
172 -- record of a concurrent type. N is the insertion node where all specs
173 -- will be placed. This routine builds the specs of the subprograms which
174 -- serve as an indirection mechanism to overriding primitives of concurrent
175 -- types, entries and protected procedures. Any new spec is analyzed.
177 function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id;
178 -- Build the function that translates the entry index in the call
179 -- (which depends on the size of entry families) into an index into the
180 -- Entry_Bodies_Array, to determine the body and barrier function used
181 -- in a protected entry call. A pointer to this function appears in every
184 function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id;
185 -- Build subprogram declaration for previous one
187 function Build_Protected_Entry
190 Pid : Node_Id) return Node_Id;
191 -- Build the procedure implementing the statement sequence of the specified
194 function Build_Protected_Entry_Specification
197 Ent_Id : Entity_Id) return Node_Id;
198 -- Build a specification for the procedure implementing the statements of
199 -- the specified entry body. Add attributes associating it with the entry
200 -- defining identifier Ent_Id.
202 function Build_Protected_Spec
204 Obj_Type : Entity_Id;
206 Unprotected : Boolean := False) return List_Id;
207 -- Utility shared by Build_Protected_Sub_Spec and Expand_Access_Protected_
208 -- Subprogram_Type. Builds signature of protected subprogram, adding the
209 -- formal that corresponds to the object itself. For an access to protected
210 -- subprogram, there is no object type to specify, so the parameter has
211 -- type Address and mode In. An indirect call through such a pointer will
212 -- convert the address to a reference to the actual object. The object is
213 -- a limited record and therefore a by_reference type.
215 function Build_Protected_Subprogram_Body
218 N_Op_Spec : Node_Id) return Node_Id;
219 -- This function is used to construct the protected version of a protected
220 -- subprogram. Its statement sequence first defers abort, then locks
221 -- the associated protected object, and then enters a block that contains
222 -- a call to the unprotected version of the subprogram (for details, see
223 -- Build_Unprotected_Subprogram_Body). This block statement requires
224 -- a cleanup handler that unlocks the object in all cases.
225 -- (see Exp_Ch7.Expand_Cleanup_Actions).
227 function Build_Selected_Name
229 Selector : Entity_Id;
230 Append_Char : Character := ' ') return Name_Id;
231 -- Build a name in the form of Prefix__Selector, with an optional
232 -- character appended. This is used for internal subprograms generated
233 -- for operations of protected types, including barrier functions.
234 -- For the subprograms generated for entry bodies and entry barriers,
235 -- the generated name includes a sequence number that makes names
236 -- unique in the presence of entry overloading. This is necessary
237 -- because entry body procedures and barrier functions all have the
240 procedure Build_Simple_Entry_Call
245 -- Some comments here would be useful ???
247 function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id;
248 -- This routine constructs a specification for the procedure that we will
249 -- build for the task body for task type T. The spec has the form:
251 -- procedure tnameB (_Task : access tnameV);
253 -- where name is the character name taken from the task type entity that
254 -- is passed as the argument to the procedure, and tnameV is the task
255 -- value type that is associated with the task type.
257 function Build_Unprotected_Subprogram_Body
259 Pid : Node_Id) return Node_Id;
260 -- This routine constructs the unprotected version of a protected
261 -- subprogram body, which is contains all of the code in the
262 -- original, unexpanded body. This is the version of the protected
263 -- subprogram that is called from all protected operations on the same
264 -- object, including the protected version of the same subprogram.
266 procedure Collect_Entry_Families
269 Current_Node : in out Node_Id;
270 Conctyp : Entity_Id);
271 -- For each entry family in a concurrent type, create an anonymous array
272 -- type of the right size, and add a component to the corresponding_record.
274 function Concurrent_Object
275 (Spec_Id : Entity_Id;
276 Conc_Typ : Entity_Id) return Entity_Id;
277 -- Given a subprogram entity Spec_Id and concurrent type Conc_Typ, return
278 -- the entity associated with the concurrent object in the Protected_Body_
279 -- Subprogram or the Task_Body_Procedure of Spec_Id. The returned entity
280 -- denotes formal parameter _O, _object or _task.
282 function Copy_Result_Type (Res : Node_Id) return Node_Id;
283 -- Copy the result type of a function specification, when building the
284 -- internal operation corresponding to a protected function, or when
285 -- expanding an access to protected function. If the result is an anonymous
286 -- access to subprogram itself, we need to create a new signature with the
287 -- same parameter names and the same resolved types, but with new entities
290 procedure Debug_Private_Data_Declarations (Decls : List_Id);
291 -- Decls is a list which may contain the declarations created by Install_
292 -- Private_Data_Declarations. All generated entities are marked as needing
293 -- debug info and debug nodes are manually generation where necessary. This
294 -- step of the expansion must to be done after private data has been moved
295 -- to its final resting scope to ensure proper visibility of debug objects.
297 function Family_Offset
302 Cap : Boolean) return Node_Id;
303 -- Compute (Hi - Lo) for two entry family indices. Hi is the index in
304 -- an accept statement, or the upper bound in the discrete subtype of
305 -- an entry declaration. Lo is the corresponding lower bound. Ttyp is
306 -- the concurrent type of the entry. If Cap is true, the result is
307 -- capped according to Entry_Family_Bound.
314 Cap : Boolean) return Node_Id;
315 -- Compute (Hi - Lo) + 1 Max 0, to determine the number of entries in
316 -- a family, and handle properly the superflat case. This is equivalent
317 -- to the use of 'Length on the index type, but must use Family_Offset
318 -- to handle properly the case of bounds that depend on discriminants.
319 -- If Cap is true, the result is capped according to Entry_Family_Bound.
321 procedure Extract_Dispatching_Call
323 Call_Ent : out Entity_Id;
324 Object : out Entity_Id;
325 Actuals : out List_Id;
326 Formals : out List_Id);
327 -- Given a dispatching call, extract the entity of the name of the call,
328 -- its object parameter, its actual parameters and the formal parameters
329 -- of the overridden interface-level version.
331 procedure Extract_Entry
333 Concval : out Node_Id;
335 Index : out Node_Id);
336 -- Given an entry call, returns the associated concurrent object,
337 -- the entry name, and the entry family index.
339 function Find_Task_Or_Protected_Pragma
341 P : Name_Id) return Node_Id;
342 -- Searches the task or protected definition T for the first occurrence
343 -- of the pragma whose name is given by P. The caller has ensured that
344 -- the pragma is present in the task definition. A special case is that
345 -- when P is Name_uPriority, the call will also find Interrupt_Priority.
346 -- ??? Should be implemented with the rep item chain mechanism.
348 function Index_Object (Spec_Id : Entity_Id) return Entity_Id;
349 -- Given a subprogram identifier, return the entity which is associated
350 -- with the protection entry index in the Protected_Body_Subprogram or the
351 -- Task_Body_Procedure of Spec_Id. The returned entity denotes formal
354 function Is_Potentially_Large_Family
355 (Base_Index : Entity_Id;
358 Hi : Node_Id) return Boolean;
360 function Is_Private_Primitive_Subprogram (Id : Entity_Id) return Boolean;
361 -- Determine whether Id is a function or a procedure and is marked as a
362 -- private primitive.
364 function Null_Statements (Stats : List_Id) return Boolean;
365 -- Used to check DO-END sequence. Checks for equivalent of DO NULL; END.
366 -- Allows labels, and pragma Warnings/Unreferenced in the sequence as
367 -- well to still count as null. Returns True for a null sequence. The
368 -- argument is the list of statements from the DO-END sequence.
370 function Parameter_Block_Pack
376 Stmts : List_Id) return Entity_Id;
377 -- Set the components of the generated parameter block with the values of
378 -- the actual parameters. Generate aliased temporaries to capture the
379 -- values for types that are passed by copy. Otherwise generate a reference
380 -- to the actual's value. Return the address of the aggregate block.
382 -- Jnn1 : alias <formal-type1>;
383 -- Jnn1 := <actual1>;
386 -- Jnn1'unchecked_access;
387 -- <actual2>'reference;
390 function Parameter_Block_Unpack
394 Formals : List_Id) return List_Id;
395 -- Retrieve the values of the components from the parameter block and
396 -- assign then to the original actual parameters. Generate:
397 -- <actual1> := P.<formal1>;
399 -- <actualN> := P.<formalN>;
401 function Trivial_Accept_OK return Boolean;
402 -- If there is no DO-END block for an accept, or if the DO-END block has
403 -- only null statements, then it is possible to do the Rendezvous with much
404 -- less overhead using the Accept_Trivial routine in the run-time library.
405 -- However, this is not always a valid optimization. Whether it is valid or
406 -- not depends on the Task_Dispatching_Policy. The issue is whether a full
407 -- rescheduling action is required or not. In FIFO_Within_Priorities, such
408 -- a rescheduling is required, so this optimization is not allowed. This
409 -- function returns True if the optimization is permitted.
411 -----------------------------
412 -- Actual_Index_Expression --
413 -----------------------------
415 function Actual_Index_Expression
419 Tsk : Entity_Id) return Node_Id
421 Ttyp : constant Entity_Id := Etype (Tsk);
429 function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id;
430 -- Compute difference between bounds of entry family
432 --------------------------
433 -- Actual_Family_Offset --
434 --------------------------
436 function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id is
438 function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id;
439 -- Replace a reference to a discriminant with a selected component
440 -- denoting the discriminant of the target task.
442 -----------------------------
443 -- Actual_Discriminant_Ref --
444 -----------------------------
446 function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id is
447 Typ : constant Entity_Id := Etype (Bound);
451 if not Is_Entity_Name (Bound)
452 or else Ekind (Entity (Bound)) /= E_Discriminant
454 if Nkind (Bound) = N_Attribute_Reference then
457 B := New_Copy_Tree (Bound);
462 Make_Selected_Component (Sloc,
463 Prefix => New_Copy_Tree (Tsk),
464 Selector_Name => New_Occurrence_Of (Entity (Bound), Sloc));
466 Analyze_And_Resolve (B, Typ);
470 Make_Attribute_Reference (Sloc,
471 Attribute_Name => Name_Pos,
472 Prefix => New_Occurrence_Of (Etype (Bound), Sloc),
473 Expressions => New_List (B));
474 end Actual_Discriminant_Ref;
476 -- Start of processing for Actual_Family_Offset
480 Make_Op_Subtract (Sloc,
481 Left_Opnd => Actual_Discriminant_Ref (Hi),
482 Right_Opnd => Actual_Discriminant_Ref (Lo));
483 end Actual_Family_Offset;
485 -- Start of processing for Actual_Index_Expression
488 -- The queues of entries and entry families appear in textual order in
489 -- the associated record. The entry index is computed as the sum of the
490 -- number of queues for all entries that precede the designated one, to
491 -- which is added the index expression, if this expression denotes a
492 -- member of a family.
494 -- The following is a place holder for the count of simple entries
496 Num := Make_Integer_Literal (Sloc, 1);
498 -- We construct an expression which is a series of addition operations.
499 -- See comments in Entry_Index_Expression, which is identical in
502 if Present (Index) then
503 S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
510 Actual_Family_Offset (
511 Make_Attribute_Reference (Sloc,
512 Attribute_Name => Name_Pos,
513 Prefix => New_Reference_To (Base_Type (S), Sloc),
514 Expressions => New_List (Relocate_Node (Index))),
515 Type_Low_Bound (S)));
520 -- Now add lengths of preceding entries and entry families
522 Prev := First_Entity (Ttyp);
524 while Chars (Prev) /= Chars (Ent)
525 or else (Ekind (Prev) /= Ekind (Ent))
526 or else not Sem_Ch6.Type_Conformant (Ent, Prev)
528 if Ekind (Prev) = E_Entry then
529 Set_Intval (Num, Intval (Num) + 1);
531 elsif Ekind (Prev) = E_Entry_Family then
533 Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
535 -- The need for the following full view retrieval stems from
536 -- this complex case of nested generics and tasking:
539 -- type Formal_Index is range <>;
542 -- type Index is private;
549 -- type Index is new Formal_Index range 1 .. 10;
552 -- package body Outer is
554 -- entry Fam (Index); -- (2)
557 -- package body Inner is -- (3)
565 -- We are currently building the index expression for the entry
566 -- call "T.E" (1). Part of the expansion must mention the range
567 -- of the discrete type "Index" (2) of entry family "Fam".
568 -- However only the private view of type "Index" is available to
569 -- the inner generic (3) because there was no prior mention of
570 -- the type inside "Inner". This visibility requirement is
571 -- implicit and cannot be detected during the construction of
572 -- the generic trees and needs special handling.
575 and then Is_Private_Type (S)
576 and then Present (Full_View (S))
581 Lo := Type_Low_Bound (S);
582 Hi := Type_High_Bound (S);
590 Actual_Family_Offset (Hi, Lo),
592 Make_Integer_Literal (Sloc, 1)));
594 -- Other components are anonymous types to be ignored
604 end Actual_Index_Expression;
606 --------------------------
607 -- Add_Formal_Renamings --
608 --------------------------
610 procedure Add_Formal_Renamings
616 Ptr : constant Entity_Id :=
618 (Next (First (Parameter_Specifications (Spec))));
619 -- The name of the formal that holds the address of the parameter block
628 Formal := First_Formal (Ent);
629 while Present (Formal) loop
630 Comp := Entry_Component (Formal);
632 Make_Defining_Identifier (Sloc (Formal),
633 Chars => Chars (Formal));
634 Set_Etype (New_F, Etype (Formal));
635 Set_Scope (New_F, Ent);
637 -- Now we set debug info needed on New_F even though it does not
638 -- come from source, so that the debugger will get the right
639 -- information for these generated names.
641 Set_Debug_Info_Needed (New_F);
643 if Ekind (Formal) = E_In_Parameter then
644 Set_Ekind (New_F, E_Constant);
646 Set_Ekind (New_F, E_Variable);
647 Set_Extra_Constrained (New_F, Extra_Constrained (Formal));
650 Set_Actual_Subtype (New_F, Actual_Subtype (Formal));
653 Make_Object_Renaming_Declaration (Loc,
654 Defining_Identifier => New_F,
656 New_Reference_To (Etype (Formal), Loc),
658 Make_Explicit_Dereference (Loc,
659 Make_Selected_Component (Loc,
661 Unchecked_Convert_To (Entry_Parameters_Type (Ent),
662 Make_Identifier (Loc, Chars (Ptr))),
664 New_Reference_To (Comp, Loc))));
666 Append (Decl, Decls);
667 Set_Renamed_Object (Formal, New_F);
668 Next_Formal (Formal);
670 end Add_Formal_Renamings;
672 ------------------------
673 -- Add_Object_Pointer --
674 ------------------------
676 procedure Add_Object_Pointer
678 Conc_Typ : Entity_Id;
681 Rec_Typ : constant Entity_Id := Corresponding_Record_Type (Conc_Typ);
686 -- Create the renaming declaration for the Protection object of a
687 -- protected type. _Object is used by Complete_Entry_Body.
688 -- ??? An attempt to make this a renaming was unsuccessful.
690 -- Build the entity for the access type
693 Make_Defining_Identifier (Loc,
694 New_External_Name (Chars (Rec_Typ), 'P'));
697 -- _object : poVP := poVP!O;
700 Make_Object_Declaration (Loc,
701 Defining_Identifier =>
702 Make_Defining_Identifier (Loc, Name_uObject),
704 New_Reference_To (Obj_Ptr, Loc),
706 Unchecked_Convert_To (Obj_Ptr,
707 Make_Identifier (Loc, Name_uO)));
708 Set_Debug_Info_Needed (Defining_Identifier (Decl));
709 Prepend_To (Decls, Decl);
712 -- type poVP is access poV;
715 Make_Full_Type_Declaration (Loc,
716 Defining_Identifier =>
719 Make_Access_To_Object_Definition (Loc,
720 Subtype_Indication =>
721 New_Reference_To (Rec_Typ, Loc)));
722 Set_Debug_Info_Needed (Defining_Identifier (Decl));
723 Prepend_To (Decls, Decl);
724 end Add_Object_Pointer;
726 -----------------------
727 -- Build_Accept_Body --
728 -----------------------
730 function Build_Accept_Body (Astat : Node_Id) return Node_Id is
731 Loc : constant Source_Ptr := Sloc (Astat);
732 Stats : constant Node_Id := Handled_Statement_Sequence (Astat);
739 -- At the end of the statement sequence, Complete_Rendezvous is called.
740 -- A label skipping the Complete_Rendezvous, and all other accept
741 -- processing, has already been added for the expansion of requeue
742 -- statements. The Sloc is copied from the last statement since it
743 -- is really part of this last statement.
747 (Sloc (Last (Statements (Stats))), RE_Complete_Rendezvous);
748 Insert_Before (Last (Statements (Stats)), Call);
751 -- If exception handlers are present, then append Complete_Rendezvous
752 -- calls to the handlers, and construct the required outer block. As
753 -- above, the Sloc is copied from the last statement in the sequence.
755 if Present (Exception_Handlers (Stats)) then
756 Hand := First (Exception_Handlers (Stats));
757 while Present (Hand) loop
760 (Sloc (Last (Statements (Hand))), RE_Complete_Rendezvous);
761 Append (Call, Statements (Hand));
767 Make_Handled_Sequence_Of_Statements (Loc,
768 Statements => New_List (
769 Make_Block_Statement (Loc,
770 Handled_Statement_Sequence => Stats)));
776 -- At this stage we know that the new statement sequence does not
777 -- have an exception handler part, so we supply one to call
778 -- Exceptional_Complete_Rendezvous. This handler is
780 -- when all others =>
781 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
783 -- We handle Abort_Signal to make sure that we properly catch the abort
784 -- case and wake up the caller.
786 Ohandle := Make_Others_Choice (Loc);
787 Set_All_Others (Ohandle);
789 Set_Exception_Handlers (New_S,
791 Make_Implicit_Exception_Handler (Loc,
792 Exception_Choices => New_List (Ohandle),
794 Statements => New_List (
795 Make_Procedure_Call_Statement (Sloc (Stats),
796 Name => New_Reference_To (
797 RTE (RE_Exceptional_Complete_Rendezvous), Sloc (Stats)),
798 Parameter_Associations => New_List (
799 Make_Function_Call (Sloc (Stats),
800 Name => New_Reference_To (
801 RTE (RE_Get_GNAT_Exception), Sloc (Stats)))))))));
803 Set_Parent (New_S, Astat); -- temp parent for Analyze call
804 Analyze_Exception_Handlers (Exception_Handlers (New_S));
805 Expand_Exception_Handlers (New_S);
807 -- Exceptional_Complete_Rendezvous must be called with abort
808 -- still deferred, which is the case for a "when all others" handler.
811 end Build_Accept_Body;
813 -----------------------------------
814 -- Build_Activation_Chain_Entity --
815 -----------------------------------
817 procedure Build_Activation_Chain_Entity (N : Node_Id) is
823 -- Loop to find enclosing construct containing activation chain variable
827 while not Nkind_In (P, N_Subprogram_Body,
828 N_Package_Declaration,
832 N_Extended_Return_Statement)
837 -- If we are in a package body, the activation chain variable is
838 -- declared in the body, but the Activation_Chain_Entity is attached
841 if Nkind (P) = N_Package_Body then
842 Decls := Declarations (P);
843 P := Unit_Declaration_Node (Corresponding_Spec (P));
845 elsif Nkind (P) = N_Package_Declaration then
846 Decls := Visible_Declarations (Specification (P));
848 elsif Nkind (P) = N_Extended_Return_Statement then
849 Decls := Return_Object_Declarations (P);
852 Decls := Declarations (P);
855 -- If activation chain entity not already declared, declare it
857 if Nkind (P) = N_Extended_Return_Statement
858 or else No (Activation_Chain_Entity (P))
860 Chain := Make_Defining_Identifier (Sloc (N), Name_uChain);
862 -- Note: An extended return statement is not really a task activator,
863 -- but it does have an activation chain on which to store the tasks
864 -- temporarily. On successful return, the tasks on this chain are
865 -- moved to the chain passed in by the caller. We do not build an
866 -- Activation_Chain_Entity for an N_Extended_Return_Statement,
867 -- because we do not want to build a call to Activate_Tasks. Task
868 -- activation is the responsibility of the caller.
870 if Nkind (P) /= N_Extended_Return_Statement then
871 Set_Activation_Chain_Entity (P, Chain);
875 Make_Object_Declaration (Sloc (P),
876 Defining_Identifier => Chain,
877 Aliased_Present => True,
879 New_Reference_To (RTE (RE_Activation_Chain), Sloc (P))));
881 Analyze (First (Decls));
883 end Build_Activation_Chain_Entity;
885 ----------------------------
886 -- Build_Barrier_Function --
887 ----------------------------
889 function Build_Barrier_Function
892 Pid : Node_Id) return Node_Id
894 Loc : constant Source_Ptr := Sloc (N);
895 Func_Id : constant Entity_Id := Barrier_Function (Ent);
896 Ent_Formals : constant Node_Id := Entry_Body_Formal_Part (N);
897 Op_Decls : constant List_Id := New_List;
901 -- Add a declaration for the Protection object, renaming declarations
902 -- for the discriminals and privals and finally a declaration for the
903 -- entry family index (if applicable).
905 Install_Private_Data_Declarations
906 (Loc, Func_Id, Pid, N, Op_Decls, True, Ekind (Ent) = E_Entry_Family);
908 -- Note: the condition in the barrier function needs to be properly
909 -- processed for the C/Fortran boolean possibility, but this happens
910 -- automatically since the return statement does this normalization.
913 Make_Subprogram_Body (Loc,
915 Build_Barrier_Function_Specification (Loc,
916 Make_Defining_Identifier (Loc, Chars (Func_Id))),
917 Declarations => Op_Decls,
918 Handled_Statement_Sequence =>
919 Make_Handled_Sequence_Of_Statements (Loc,
920 Statements => New_List (
921 Make_Simple_Return_Statement (Loc,
922 Expression => Condition (Ent_Formals)))));
923 Set_Is_Entry_Barrier_Function (Func_Body);
926 end Build_Barrier_Function;
928 ------------------------------------------
929 -- Build_Barrier_Function_Specification --
930 ------------------------------------------
932 function Build_Barrier_Function_Specification
934 Def_Id : Entity_Id) return Node_Id
937 Set_Debug_Info_Needed (Def_Id);
939 return Make_Function_Specification (Loc,
940 Defining_Unit_Name => Def_Id,
941 Parameter_Specifications => New_List (
942 Make_Parameter_Specification (Loc,
943 Defining_Identifier =>
944 Make_Defining_Identifier (Loc, Name_uO),
946 New_Reference_To (RTE (RE_Address), Loc)),
948 Make_Parameter_Specification (Loc,
949 Defining_Identifier =>
950 Make_Defining_Identifier (Loc, Name_uE),
952 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))),
955 New_Reference_To (Standard_Boolean, Loc));
956 end Build_Barrier_Function_Specification;
958 --------------------------
959 -- Build_Call_With_Task --
960 --------------------------
962 function Build_Call_With_Task
964 E : Entity_Id) return Node_Id
966 Loc : constant Source_Ptr := Sloc (N);
969 Make_Function_Call (Loc,
970 Name => New_Reference_To (E, Loc),
971 Parameter_Associations => New_List (Concurrent_Ref (N)));
972 end Build_Call_With_Task;
974 --------------------------------
975 -- Build_Corresponding_Record --
976 --------------------------------
978 function Build_Corresponding_Record
981 Loc : Source_Ptr) return Node_Id
983 Rec_Ent : constant Entity_Id :=
984 Make_Defining_Identifier
985 (Loc, New_External_Name (Chars (Ctyp), 'V'));
988 New_Disc : Entity_Id;
992 Set_Corresponding_Record_Type (Ctyp, Rec_Ent);
993 Set_Ekind (Rec_Ent, E_Record_Type);
994 Set_Has_Delayed_Freeze (Rec_Ent, Has_Delayed_Freeze (Ctyp));
995 Set_Is_Concurrent_Record_Type (Rec_Ent, True);
996 Set_Corresponding_Concurrent_Type (Rec_Ent, Ctyp);
997 Set_Stored_Constraint (Rec_Ent, No_Elist);
1000 -- Use discriminals to create list of discriminants for record, and
1001 -- create new discriminals for use in default expressions, etc. It is
1002 -- worth noting that a task discriminant gives rise to 5 entities;
1004 -- a) The original discriminant.
1005 -- b) The discriminal for use in the task.
1006 -- c) The discriminant of the corresponding record.
1007 -- d) The discriminal for the init proc of the corresponding record.
1008 -- e) The local variable that renames the discriminant in the procedure
1009 -- for the task body.
1011 -- In fact the discriminals b) are used in the renaming declarations
1012 -- for e). See details in einfo (Handling of Discriminants).
1014 if Present (Discriminant_Specifications (N)) then
1016 Disc := First_Discriminant (Ctyp);
1018 while Present (Disc) loop
1019 New_Disc := CR_Discriminant (Disc);
1022 Make_Discriminant_Specification (Loc,
1023 Defining_Identifier => New_Disc,
1024 Discriminant_Type =>
1025 New_Occurrence_Of (Etype (Disc), Loc),
1027 New_Copy (Discriminant_Default_Value (Disc))));
1029 Next_Discriminant (Disc);
1036 -- Now we can construct the record type declaration. Note that this
1037 -- record is "limited tagged". It is "limited" to reflect the underlying
1038 -- limitedness of the task or protected object that it represents, and
1039 -- ensuring for example that it is properly passed by reference. It is
1040 -- "tagged" to give support to dispatching calls through interfaces (Ada
1044 Make_Full_Type_Declaration (Loc,
1045 Defining_Identifier => Rec_Ent,
1046 Discriminant_Specifications => Dlist,
1048 Make_Record_Definition (Loc,
1050 Make_Component_List (Loc,
1051 Component_Items => Cdecls),
1053 Ada_Version >= Ada_05 and then Is_Tagged_Type (Ctyp),
1054 Limited_Present => True));
1055 end Build_Corresponding_Record;
1057 ----------------------------------
1058 -- Build_Entry_Count_Expression --
1059 ----------------------------------
1061 function Build_Entry_Count_Expression
1062 (Concurrent_Type : Node_Id;
1063 Component_List : List_Id;
1064 Loc : Source_Ptr) return Node_Id
1076 -- Count number of non-family entries
1079 Ent := First_Entity (Concurrent_Type);
1080 while Present (Ent) loop
1081 if Ekind (Ent) = E_Entry then
1088 Ecount := Make_Integer_Literal (Loc, Eindx);
1090 -- Loop through entry families building the addition nodes
1092 Ent := First_Entity (Concurrent_Type);
1093 Comp := First (Component_List);
1094 while Present (Ent) loop
1095 if Ekind (Ent) = E_Entry_Family then
1096 while Chars (Ent) /= Chars (Defining_Identifier (Comp)) loop
1100 Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
1101 Hi := Type_High_Bound (Typ);
1102 Lo := Type_Low_Bound (Typ);
1103 Large := Is_Potentially_Large_Family
1104 (Base_Type (Typ), Concurrent_Type, Lo, Hi);
1107 Left_Opnd => Ecount,
1108 Right_Opnd => Family_Size
1109 (Loc, Hi, Lo, Concurrent_Type, Large));
1116 end Build_Entry_Count_Expression;
1118 -----------------------
1119 -- Build_Entry_Names --
1120 -----------------------
1122 function Build_Entry_Names (Conc_Typ : Entity_Id) return Node_Id is
1123 Loc : constant Source_Ptr := Sloc (Conc_Typ);
1129 Typ : Entity_Id := Conc_Typ;
1131 procedure Build_Entry_Family_Name (Id : Entity_Id);
1133 -- for Lnn in Family_Low .. Family_High loop
1136 -- (_init._object <or> _init._task_id,
1138 -- new String ("<Entry name>(" & Lnn'Img & ")"));
1140 -- Note that the bounds of the range may reference discriminants. The
1141 -- above construct is added directly to the statements of the block.
1143 procedure Build_Entry_Name (Id : Entity_Id);
1147 -- (_init._object <or>_init._task_id,
1149 -- new String ("<Entry name>");
1150 -- The above construct is added directly to the statements of the block.
1152 function Build_Set_Entry_Name_Call (Arg3 : Node_Id) return Node_Id;
1153 -- Generate the call to the runtime routine Set_Entry_Name with actuals
1154 -- _init._task_id or _init._object, Inn and Arg3.
1156 function Find_Protection_Type (Conc_Typ : Entity_Id) return Entity_Id;
1157 -- Given a protected type or its corresponding record, find the type of
1160 procedure Increment_Index (Stmts : List_Id);
1161 -- Generate the following and add it to Stmts
1164 -----------------------------
1165 -- Build_Entry_Family_Name --
1166 -----------------------------
1168 procedure Build_Entry_Family_Name (Id : Entity_Id) is
1169 Def : constant Node_Id :=
1170 Discrete_Subtype_Definition (Parent (Id));
1171 L_Id : constant Entity_Id :=
1172 Make_Defining_Identifier (Loc, New_Internal_Name ('L'));
1173 L_Stmts : constant List_Id := New_List;
1176 function Build_Range (Def : Node_Id) return Node_Id;
1177 -- Given a discrete subtype definition of an entry family, generate a
1178 -- range node which covers the range of Def's type.
1184 function Build_Range (Def : Node_Id) return Node_Id is
1185 High : Node_Id := Type_High_Bound (Etype (Def));
1186 Low : Node_Id := Type_Low_Bound (Etype (Def));
1189 -- If a bound references a discriminant, generate an identifier
1190 -- with the same name. Resolution will map it to the formals of
1193 if Is_Entity_Name (Low)
1194 and then Ekind (Entity (Low)) = E_Discriminant
1196 Low := Make_Identifier (Loc, Chars (Low));
1198 Low := New_Copy_Tree (Low);
1201 if Is_Entity_Name (High)
1202 and then Ekind (Entity (High)) = E_Discriminant
1204 High := Make_Identifier (Loc, Chars (High));
1206 High := New_Copy_Tree (High);
1212 High_Bound => High);
1215 -- Start of processing for Build_Entry_Family_Name
1218 Get_Name_String (Chars (Id));
1220 -- Add a leading '('
1222 Add_Char_To_Name_Buffer ('(');
1225 -- new String'("<Entry name>(" & Lnn'Img & ")");
1227 -- This is an implicit heap allocation, and Comes_From_Source is
1228 -- False, which ensures that it will get flagged as a violation of
1229 -- No_Implicit_Heap_Allocations when that restriction applies.
1232 Make_Allocator (Loc,
1233 Make_Qualified_Expression (Loc,
1235 New_Reference_To (Standard_String, Loc),
1237 Make_Op_Concat (Loc,
1239 Make_Op_Concat (Loc,
1241 Make_String_Literal (Loc,
1242 Strval => String_From_Name_Buffer),
1244 Make_Attribute_Reference (Loc,
1246 New_Reference_To (L_Id, Loc),
1247 Attribute_Name => Name_Img)),
1249 Make_String_Literal (Loc,
1252 Increment_Index (L_Stmts);
1253 Append_To (L_Stmts, Build_Set_Entry_Name_Call (Val));
1256 -- for Lnn in Family_Low .. Family_High loop
1259 -- (_init._object <or> _init._task_id, Inn, <Val>);
1263 Make_Loop_Statement (Loc,
1265 Make_Iteration_Scheme (Loc,
1266 Loop_Parameter_Specification =>
1267 Make_Loop_Parameter_Specification (Loc,
1268 Defining_Identifier => L_Id,
1269 Discrete_Subtype_Definition =>
1270 Build_Range (Def))),
1271 Statements => L_Stmts,
1272 End_Label => Empty));
1273 end Build_Entry_Family_Name;
1275 ----------------------
1276 -- Build_Entry_Name --
1277 ----------------------
1279 procedure Build_Entry_Name (Id : Entity_Id) is
1283 Get_Name_String (Chars (Id));
1285 -- This is an implicit heap allocation, and Comes_From_Source is
1286 -- False, which ensures that it will get flagged as a violation of
1287 -- No_Implicit_Heap_Allocations when that restriction applies.
1290 Make_Allocator (Loc,
1291 Make_Qualified_Expression (Loc,
1293 New_Reference_To (Standard_String, Loc),
1295 Make_String_Literal (Loc,
1296 String_From_Name_Buffer)));
1298 Increment_Index (B_Stmts);
1299 Append_To (B_Stmts, Build_Set_Entry_Name_Call (Val));
1300 end Build_Entry_Name;
1302 -------------------------------
1303 -- Build_Set_Entry_Name_Call --
1304 -------------------------------
1306 function Build_Set_Entry_Name_Call (Arg3 : Node_Id) return Node_Id is
1311 -- Determine the proper name for the first argument and the RTS
1314 if Is_Protected_Type (Typ) then
1315 Arg1 := Name_uObject;
1316 Proc := RO_PE_Set_Entry_Name;
1318 else pragma Assert (Is_Task_Type (Typ));
1319 Arg1 := Name_uTask_Id;
1320 Proc := RO_TS_Set_Entry_Name;
1324 -- Set_Entry_Name (_init.Arg1, Inn, Arg3);
1327 Make_Procedure_Call_Statement (Loc,
1329 New_Reference_To (RTE (Proc), Loc),
1330 Parameter_Associations => New_List (
1331 Make_Selected_Component (Loc, -- _init._object
1332 Prefix => -- _init._task_id
1333 Make_Identifier (Loc, Name_uInit),
1335 Make_Identifier (Loc, Arg1)),
1336 New_Reference_To (Index, Loc), -- Inn
1338 end Build_Set_Entry_Name_Call;
1340 --------------------------
1341 -- Find_Protection_Type --
1342 --------------------------
1344 function Find_Protection_Type (Conc_Typ : Entity_Id) return Entity_Id is
1346 Typ : Entity_Id := Conc_Typ;
1349 if Is_Concurrent_Type (Typ) then
1350 Typ := Corresponding_Record_Type (Typ);
1353 Comp := First_Component (Typ);
1354 while Present (Comp) loop
1355 if Chars (Comp) = Name_uObject then
1356 return Base_Type (Etype (Comp));
1359 Next_Component (Comp);
1362 -- The corresponding record of a protected type should always have an
1365 raise Program_Error;
1366 end Find_Protection_Type;
1368 ---------------------
1369 -- Increment_Index --
1370 ---------------------
1372 procedure Increment_Index (Stmts : List_Id) is
1378 Make_Assignment_Statement (Loc,
1380 New_Reference_To (Index, Loc),
1384 New_Reference_To (Index, Loc),
1386 Make_Integer_Literal (Loc, 1))));
1387 end Increment_Index;
1389 -- Start of processing for Build_Entry_Names
1392 -- Retrieve the original concurrent type
1394 if Is_Concurrent_Record_Type (Typ) then
1395 Typ := Corresponding_Concurrent_Type (Typ);
1398 pragma Assert (Is_Protected_Type (Typ) or else Is_Task_Type (Typ));
1400 -- Nothing to do if the type has no entries
1402 if not Has_Entries (Typ) then
1406 -- Avoid generating entry names for a protected type with only one entry
1408 if Is_Protected_Type (Typ)
1409 and then Find_Protection_Type (Typ) /= RTE (RE_Protection_Entries)
1414 Index := Make_Defining_Identifier (Loc, New_Internal_Name ('I'));
1416 -- Step 1: Generate the declaration of the index variable:
1417 -- Inn : Protected_Entry_Index := 0;
1419 -- Inn : Task_Entry_Index := 0;
1421 if Is_Protected_Type (Typ) then
1422 Index_Typ := RE_Protected_Entry_Index;
1424 Index_Typ := RE_Task_Entry_Index;
1427 B_Decls := New_List;
1429 Make_Object_Declaration (Loc,
1430 Defining_Identifier => Index,
1431 Object_Definition =>
1432 New_Reference_To (RTE (Index_Typ), Loc),
1434 Make_Integer_Literal (Loc, 0)));
1436 B_Stmts := New_List;
1438 -- Step 2: Generate a call to Set_Entry_Name for each entry and entry
1441 Comp := First_Entity (Typ);
1442 while Present (Comp) loop
1443 if Ekind (Comp) = E_Entry then
1444 Build_Entry_Name (Comp);
1446 elsif Ekind (Comp) = E_Entry_Family then
1447 Build_Entry_Family_Name (Comp);
1453 -- Step 3: Wrap the statements in a block
1456 Make_Block_Statement (Loc,
1457 Declarations => B_Decls,
1458 Handled_Statement_Sequence =>
1459 Make_Handled_Sequence_Of_Statements (Loc,
1460 Statements => B_Stmts));
1461 end Build_Entry_Names;
1463 ---------------------------
1464 -- Build_Parameter_Block --
1465 ---------------------------
1467 function Build_Parameter_Block
1471 Decls : List_Id) return Entity_Id
1477 Has_Comp : Boolean := False;
1481 Actual := First (Actuals);
1483 Formal := Defining_Identifier (First (Formals));
1485 while Present (Actual) loop
1486 if not Is_Controlling_Actual (Actual) then
1489 -- type Ann is access all <actual-type>
1492 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
1495 Make_Full_Type_Declaration (Loc,
1496 Defining_Identifier =>
1499 Make_Access_To_Object_Definition (Loc,
1503 Ekind (Formal) = E_In_Parameter,
1504 Subtype_Indication =>
1505 New_Reference_To (Etype (Actual), Loc))));
1511 Make_Component_Declaration (Loc,
1512 Defining_Identifier =>
1513 Make_Defining_Identifier (Loc, Chars (Formal)),
1514 Component_Definition =>
1515 Make_Component_Definition (Loc,
1518 Subtype_Indication =>
1519 New_Reference_To (Comp_Nam, Loc))));
1524 Next_Actual (Actual);
1525 Next_Formal_With_Extras (Formal);
1529 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
1534 -- type Pnn is record
1539 -- where Pnn is a parameter wrapping record, Param1 .. ParamN are
1540 -- the original parameter names and Ann1 .. AnnN are the access to
1544 Make_Full_Type_Declaration (Loc,
1545 Defining_Identifier =>
1548 Make_Record_Definition (Loc,
1550 Make_Component_List (Loc, Comps))));
1553 -- type Pnn is null record;
1556 Make_Full_Type_Declaration (Loc,
1557 Defining_Identifier =>
1560 Make_Record_Definition (Loc,
1561 Null_Present => True,
1562 Component_List => Empty)));
1566 end Build_Parameter_Block;
1568 --------------------------
1569 -- Build_Wrapper_Bodies --
1570 --------------------------
1572 procedure Build_Wrapper_Bodies
1577 Rec_Typ : Entity_Id;
1579 function Build_Wrapper_Body
1581 Subp_Id : Entity_Id;
1582 Obj_Typ : Entity_Id;
1583 Formals : List_Id) return Node_Id;
1584 -- Ada 2005 (AI-345): Build the body that wraps a primitive operation
1585 -- associated with a protected or task type. Subp_Id is the subprogram
1586 -- name which will be wrapped. Obj_Typ is the type of the new formal
1587 -- parameter which handles dispatching and object notation. Formals are
1588 -- the original formals of Subp_Id which will be explicitly replicated.
1590 ------------------------
1591 -- Build_Wrapper_Body --
1592 ------------------------
1594 function Build_Wrapper_Body
1596 Subp_Id : Entity_Id;
1597 Obj_Typ : Entity_Id;
1598 Formals : List_Id) return Node_Id
1600 Body_Spec : Node_Id;
1603 Body_Spec := Build_Wrapper_Spec (Subp_Id, Obj_Typ, Formals);
1605 -- The subprogram is not overriding or is not a primitive declared
1606 -- between two views.
1608 if No (Body_Spec) then
1613 Actuals : List_Id := No_List;
1615 First_Form : Node_Id;
1620 -- Map formals to actuals. Use the list built for the wrapper
1621 -- spec, skipping the object notation parameter.
1623 First_Form := First (Parameter_Specifications (Body_Spec));
1625 Formal := First_Form;
1628 if Present (Formal) then
1629 Actuals := New_List;
1631 while Present (Formal) loop
1633 Make_Identifier (Loc, Chars =>
1634 Chars (Defining_Identifier (Formal))));
1640 -- Special processing for primitives declared between a private
1641 -- type and its completion: the wrapper needs a properly typed
1642 -- parameter if the wrapped operation has a controlling first
1643 -- parameter. Note that this might not be the case for a function
1644 -- with a controlling result.
1646 if Is_Private_Primitive_Subprogram (Subp_Id) then
1647 if No (Actuals) then
1648 Actuals := New_List;
1651 if Is_Controlling_Formal (First_Formal (Subp_Id)) then
1652 Prepend_To (Actuals,
1653 Unchecked_Convert_To (
1654 Corresponding_Concurrent_Type (Obj_Typ),
1655 Make_Identifier (Loc, Name_uO)));
1658 Prepend_To (Actuals,
1659 Make_Identifier (Loc, Chars =>
1660 Chars (Defining_Identifier (First_Form))));
1663 Nam := New_Reference_To (Subp_Id, Loc);
1665 -- An access-to-variable object parameter requires an explicit
1666 -- dereference in the unchecked conversion. This case occurs
1667 -- when a protected entry wrapper must override an interface
1668 -- level procedure with interface access as first parameter.
1670 -- O.all.Subp_Id (Formal_1, ..., Formal_N)
1672 if Nkind (Parameter_Type (First_Form)) =
1676 Make_Explicit_Dereference (Loc,
1677 Prefix => Make_Identifier (Loc, Name_uO));
1679 Conv_Id := Make_Identifier (Loc, Name_uO);
1683 Make_Selected_Component (Loc,
1685 Unchecked_Convert_To (
1686 Corresponding_Concurrent_Type (Obj_Typ),
1689 New_Reference_To (Subp_Id, Loc));
1692 -- Create the subprogram body. For a function, the call to the
1693 -- actual subprogram has to be converted to the corresponding
1694 -- record if it is a controlling result.
1696 if Ekind (Subp_Id) = E_Function then
1702 Make_Function_Call (Loc,
1704 Parameter_Associations => Actuals);
1706 if Has_Controlling_Result (Subp_Id) then
1708 Unchecked_Convert_To
1709 (Corresponding_Record_Type (Etype (Subp_Id)), Res);
1713 Make_Subprogram_Body (Loc,
1714 Specification => Body_Spec,
1715 Declarations => Empty_List,
1716 Handled_Statement_Sequence =>
1717 Make_Handled_Sequence_Of_Statements (Loc,
1718 Statements => New_List (
1719 Make_Simple_Return_Statement (Loc, Res))));
1724 Make_Subprogram_Body (Loc,
1725 Specification => Body_Spec,
1726 Declarations => Empty_List,
1727 Handled_Statement_Sequence =>
1728 Make_Handled_Sequence_Of_Statements (Loc,
1729 Statements => New_List (
1730 Make_Procedure_Call_Statement (Loc,
1732 Parameter_Associations => Actuals))));
1735 end Build_Wrapper_Body;
1737 -- Start of processing for Build_Wrapper_Bodies
1740 if Is_Concurrent_Type (Typ) then
1741 Rec_Typ := Corresponding_Record_Type (Typ);
1746 -- Generate wrapper bodies for a concurrent type which implements an
1749 if Present (Interfaces (Rec_Typ)) then
1751 Insert_Nod : Node_Id;
1753 Prim_Elmt : Elmt_Id;
1754 Prim_Decl : Node_Id;
1756 Wrap_Body : Node_Id;
1757 Wrap_Id : Entity_Id;
1762 -- Examine all primitive operations of the corresponding record
1763 -- type, looking for wrapper specs. Generate bodies in order to
1766 Prim_Elmt := First_Elmt (Primitive_Operations (Rec_Typ));
1767 while Present (Prim_Elmt) loop
1768 Prim := Node (Prim_Elmt);
1770 if (Ekind (Prim) = E_Function
1771 or else Ekind (Prim) = E_Procedure)
1772 and then Is_Primitive_Wrapper (Prim)
1774 Subp := Wrapped_Entity (Prim);
1775 Prim_Decl := Parent (Parent (Prim));
1778 Build_Wrapper_Body (Loc,
1781 Formals => Parameter_Specifications (Parent (Subp)));
1782 Wrap_Id := Defining_Unit_Name (Specification (Wrap_Body));
1784 Set_Corresponding_Spec (Wrap_Body, Prim);
1785 Set_Corresponding_Body (Prim_Decl, Wrap_Id);
1787 Insert_After (Insert_Nod, Wrap_Body);
1788 Insert_Nod := Wrap_Body;
1790 Analyze (Wrap_Body);
1793 Next_Elmt (Prim_Elmt);
1797 end Build_Wrapper_Bodies;
1799 ------------------------
1800 -- Build_Wrapper_Spec --
1801 ------------------------
1803 function Build_Wrapper_Spec
1804 (Subp_Id : Entity_Id;
1805 Obj_Typ : Entity_Id;
1806 Formals : List_Id) return Node_Id
1808 Loc : constant Source_Ptr := Sloc (Subp_Id);
1809 First_Param : Node_Id;
1811 Iface_Elmt : Elmt_Id;
1812 Iface_Op : Entity_Id;
1813 Iface_Op_Elmt : Elmt_Id;
1815 function Overriding_Possible
1816 (Iface_Op : Entity_Id;
1817 Wrapper : Entity_Id) return Boolean;
1818 -- Determine whether a primitive operation can be overridden by Wrapper.
1819 -- Iface_Op is the candidate primitive operation of an interface type,
1820 -- Wrapper is the generated entry wrapper.
1822 function Replicate_Formals
1824 Formals : List_Id) return List_Id;
1825 -- An explicit parameter replication is required due to the Is_Entry_
1826 -- Formal flag being set for all the formals of an entry. The explicit
1827 -- replication removes the flag that would otherwise cause a different
1828 -- path of analysis.
1830 -------------------------
1831 -- Overriding_Possible --
1832 -------------------------
1834 function Overriding_Possible
1835 (Iface_Op : Entity_Id;
1836 Wrapper : Entity_Id) return Boolean
1838 Iface_Op_Spec : constant Node_Id := Parent (Iface_Op);
1839 Wrapper_Spec : constant Node_Id := Parent (Wrapper);
1841 function Type_Conformant_Parameters
1842 (Iface_Op_Params : List_Id;
1843 Wrapper_Params : List_Id) return Boolean;
1844 -- Determine whether the parameters of the generated entry wrapper
1845 -- and those of a primitive operation are type conformant. During
1846 -- this check, the first parameter of the primitive operation is
1847 -- skipped if it is a controlling argument: protected functions
1848 -- may have a controlling result.
1850 --------------------------------
1851 -- Type_Conformant_Parameters --
1852 --------------------------------
1854 function Type_Conformant_Parameters
1855 (Iface_Op_Params : List_Id;
1856 Wrapper_Params : List_Id) return Boolean
1858 Iface_Op_Param : Node_Id;
1859 Iface_Op_Typ : Entity_Id;
1860 Wrapper_Param : Node_Id;
1861 Wrapper_Typ : Entity_Id;
1864 -- Skip the first (controlling) parameter of primitive operation
1866 Iface_Op_Param := First (Iface_Op_Params);
1868 if Present (First_Formal (Iface_Op))
1869 and then Is_Controlling_Formal (First_Formal (Iface_Op))
1871 Iface_Op_Param := Next (Iface_Op_Param);
1874 Wrapper_Param := First (Wrapper_Params);
1875 while Present (Iface_Op_Param)
1876 and then Present (Wrapper_Param)
1878 Iface_Op_Typ := Find_Parameter_Type (Iface_Op_Param);
1879 Wrapper_Typ := Find_Parameter_Type (Wrapper_Param);
1881 -- The two parameters must be mode conformant
1883 if not Conforming_Types
1884 (Iface_Op_Typ, Wrapper_Typ, Mode_Conformant)
1889 Next (Iface_Op_Param);
1890 Next (Wrapper_Param);
1893 -- One of the lists is longer than the other
1895 if Present (Iface_Op_Param) or else Present (Wrapper_Param) then
1900 end Type_Conformant_Parameters;
1902 -- Start of processing for Overriding_Possible
1905 if Chars (Iface_Op) /= Chars (Wrapper) then
1909 -- If an inherited subprogram is implemented by a protected procedure
1910 -- or an entry, then the first parameter of the inherited subprogram
1911 -- shall be of mode OUT or IN OUT, or access-to-variable parameter.
1913 if Ekind (Iface_Op) = E_Procedure
1914 and then Present (Parameter_Specifications (Iface_Op_Spec))
1917 Obj_Param : constant Node_Id :=
1918 First (Parameter_Specifications (Iface_Op_Spec));
1920 if not Out_Present (Obj_Param)
1921 and then Nkind (Parameter_Type (Obj_Param)) /=
1930 Type_Conformant_Parameters (
1931 Parameter_Specifications (Iface_Op_Spec),
1932 Parameter_Specifications (Wrapper_Spec));
1933 end Overriding_Possible;
1935 -----------------------
1936 -- Replicate_Formals --
1937 -----------------------
1939 function Replicate_Formals
1941 Formals : List_Id) return List_Id
1943 New_Formals : constant List_Id := New_List;
1945 Param_Type : Node_Id;
1948 Formal := First (Formals);
1950 -- Skip the object parameter when dealing with primitives declared
1951 -- between two views.
1953 if Is_Private_Primitive_Subprogram (Subp_Id)
1954 and then not Has_Controlling_Result (Subp_Id)
1956 Formal := Next (Formal);
1959 while Present (Formal) loop
1961 -- Create an explicit copy of the entry parameter
1963 -- When creating the wrapper subprogram for a primitive operation
1964 -- of a protected interface we must construct an equivalent
1965 -- signature to that of the overriding operation. For regular
1966 -- parameters we can just use the type of the formal, but for
1967 -- access to subprogram parameters we need to reanalyze the
1968 -- parameter type to create local entities for the signature of
1969 -- the subprogram type. Using the entities of the overriding
1970 -- subprogram will result in out-of-scope errors in the back-end.
1972 if Nkind (Parameter_Type (Formal)) = N_Access_Definition then
1973 Param_Type := Copy_Separate_Tree (Parameter_Type (Formal));
1976 New_Reference_To (Etype (Parameter_Type (Formal)), Loc);
1979 Append_To (New_Formals,
1980 Make_Parameter_Specification (Loc,
1981 Defining_Identifier =>
1982 Make_Defining_Identifier (Loc,
1983 Chars => Chars (Defining_Identifier (Formal))),
1984 In_Present => In_Present (Formal),
1985 Out_Present => Out_Present (Formal),
1986 Parameter_Type => Param_Type));
1992 end Replicate_Formals;
1994 -- Start of processing for Build_Wrapper_Spec
1997 -- There is no point in building wrappers for non-tagged concurrent
2000 pragma Assert (Is_Tagged_Type (Obj_Typ));
2002 -- An entry or a protected procedure can override a routine where the
2003 -- controlling formal is either IN OUT, OUT or is of access-to-variable
2004 -- type. Since the wrapper must have the exact same signature as that of
2005 -- the overridden subprogram, we try to find the overriding candidate
2006 -- and use its controlling formal.
2008 First_Param := Empty;
2010 -- Check every implemented interface
2012 if Present (Interfaces (Obj_Typ)) then
2013 Iface_Elmt := First_Elmt (Interfaces (Obj_Typ));
2014 Search : while Present (Iface_Elmt) loop
2015 Iface := Node (Iface_Elmt);
2017 -- Check every interface primitive
2019 if Present (Primitive_Operations (Iface)) then
2020 Iface_Op_Elmt := First_Elmt (Primitive_Operations (Iface));
2021 while Present (Iface_Op_Elmt) loop
2022 Iface_Op := Node (Iface_Op_Elmt);
2024 -- Ignore predefined primitives
2026 if not Is_Predefined_Dispatching_Operation (Iface_Op) then
2027 Iface_Op := Ultimate_Alias (Iface_Op);
2029 -- The current primitive operation can be overridden by
2030 -- the generated entry wrapper.
2032 if Overriding_Possible (Iface_Op, Subp_Id) then
2034 First (Parameter_Specifications (Parent (Iface_Op)));
2040 Next_Elmt (Iface_Op_Elmt);
2044 Next_Elmt (Iface_Elmt);
2048 -- If the subprogram to be wrapped is not overriding anything or is not
2049 -- a primitive declared between two views, do not produce anything. This
2050 -- avoids spurious errors involving overriding.
2053 and then not Is_Private_Primitive_Subprogram (Subp_Id)
2059 Wrapper_Id : constant Entity_Id :=
2060 Make_Defining_Identifier (Loc, Chars (Subp_Id));
2061 New_Formals : List_Id;
2062 Obj_Param : Node_Id;
2063 Obj_Param_Typ : Entity_Id;
2066 -- Minimum decoration is needed to catch the entity in
2067 -- Sem_Ch6.Override_Dispatching_Operation.
2069 if Ekind (Subp_Id) = E_Function then
2070 Set_Ekind (Wrapper_Id, E_Function);
2072 Set_Ekind (Wrapper_Id, E_Procedure);
2075 Set_Is_Primitive_Wrapper (Wrapper_Id);
2076 Set_Wrapped_Entity (Wrapper_Id, Subp_Id);
2077 Set_Is_Private_Primitive (Wrapper_Id,
2078 Is_Private_Primitive_Subprogram (Subp_Id));
2080 -- Process the formals
2082 New_Formals := Replicate_Formals (Loc, Formals);
2084 -- A function with a controlling result and no first controlling
2085 -- formal needs no additional parameter.
2087 if Has_Controlling_Result (Subp_Id)
2089 (No (First_Formal (Subp_Id))
2090 or else not Is_Controlling_Formal (First_Formal (Subp_Id)))
2094 -- Routine Subp_Id has been found to override an interface primitive.
2095 -- If the interface operation has an access parameter, create a copy
2096 -- of it, with the same null exclusion indicator if present.
2098 elsif Present (First_Param) then
2099 if Nkind (Parameter_Type (First_Param)) = N_Access_Definition then
2101 Make_Access_Definition (Loc,
2103 New_Reference_To (Obj_Typ, Loc));
2104 Set_Null_Exclusion_Present (Obj_Param_Typ,
2105 Null_Exclusion_Present (Parameter_Type (First_Param)));
2108 Obj_Param_Typ := New_Reference_To (Obj_Typ, Loc);
2112 Make_Parameter_Specification (Loc,
2113 Defining_Identifier =>
2114 Make_Defining_Identifier (Loc,
2116 In_Present => In_Present (First_Param),
2117 Out_Present => Out_Present (First_Param),
2118 Parameter_Type => Obj_Param_Typ);
2120 Prepend_To (New_Formals, Obj_Param);
2122 -- If we are dealing with a primitive declared between two views,
2123 -- implemented by a synchronized operation, we need to create
2124 -- a default parameter. The mode of the parameter must match that
2125 -- of the primitive operation.
2128 pragma Assert (Is_Private_Primitive_Subprogram (Subp_Id));
2130 Make_Parameter_Specification (Loc,
2131 Defining_Identifier =>
2132 Make_Defining_Identifier (Loc, Name_uO),
2133 In_Present => In_Present (Parent (First_Entity (Subp_Id))),
2134 Out_Present => Ekind (Subp_Id) /= E_Function,
2135 Parameter_Type => New_Reference_To (Obj_Typ, Loc));
2136 Prepend_To (New_Formals, Obj_Param);
2139 -- Build the final spec. If it is a function with a controlling
2140 -- result, it is a primitive operation of the corresponding
2141 -- record type, so mark the spec accordingly.
2143 if Ekind (Subp_Id) = E_Function then
2149 if Has_Controlling_Result (Subp_Id) then
2152 (Corresponding_Record_Type (Etype (Subp_Id)), Loc);
2154 Res_Def := New_Copy (Result_Definition (Parent (Subp_Id)));
2158 Make_Function_Specification (Loc,
2159 Defining_Unit_Name => Wrapper_Id,
2160 Parameter_Specifications => New_Formals,
2161 Result_Definition => Res_Def);
2165 Make_Procedure_Specification (Loc,
2166 Defining_Unit_Name => Wrapper_Id,
2167 Parameter_Specifications => New_Formals);
2170 end Build_Wrapper_Spec;
2172 -------------------------
2173 -- Build_Wrapper_Specs --
2174 -------------------------
2176 procedure Build_Wrapper_Specs
2182 Rec_Typ : Entity_Id;
2185 if Is_Protected_Type (Typ) then
2186 Def := Protected_Definition (Parent (Typ));
2187 else pragma Assert (Is_Task_Type (Typ));
2188 Def := Task_Definition (Parent (Typ));
2191 Rec_Typ := Corresponding_Record_Type (Typ);
2193 -- Generate wrapper specs for a concurrent type which implements an
2194 -- interface and has visible entries and/or protected procedures.
2196 if Present (Interfaces (Rec_Typ))
2197 and then Present (Def)
2198 and then Present (Visible_Declarations (Def))
2202 Wrap_Decl : Node_Id;
2203 Wrap_Spec : Node_Id;
2206 Decl := First (Visible_Declarations (Def));
2207 while Present (Decl) loop
2210 if Nkind (Decl) = N_Entry_Declaration
2211 and then Ekind (Defining_Identifier (Decl)) = E_Entry
2215 (Subp_Id => Defining_Identifier (Decl),
2217 Formals => Parameter_Specifications (Decl));
2219 elsif Nkind (Decl) = N_Subprogram_Declaration then
2222 (Subp_Id => Defining_Unit_Name (Specification (Decl)),
2225 Parameter_Specifications (Specification (Decl)));
2228 if Present (Wrap_Spec) then
2230 Make_Subprogram_Declaration (Loc,
2231 Specification => Wrap_Spec);
2233 Insert_After (N, Wrap_Decl);
2236 Analyze (Wrap_Decl);
2243 end Build_Wrapper_Specs;
2245 ---------------------------
2246 -- Build_Find_Body_Index --
2247 ---------------------------
2249 function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id is
2250 Loc : constant Source_Ptr := Sloc (Typ);
2253 Has_F : Boolean := False;
2255 If_St : Node_Id := Empty;
2258 Decls : List_Id := New_List;
2261 Siz : Node_Id := Empty;
2263 procedure Add_If_Clause (Expr : Node_Id);
2264 -- Add test for range of current entry
2266 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
2267 -- If a bound of an entry is given by a discriminant, retrieve the
2268 -- actual value of the discriminant from the enclosing object.
2274 procedure Add_If_Clause (Expr : Node_Id) is
2276 Stats : constant List_Id :=
2278 Make_Simple_Return_Statement (Loc,
2279 Expression => Make_Integer_Literal (Loc, Index + 1)));
2282 -- Index for current entry body
2286 -- Compute total length of entry queues so far
2294 Right_Opnd => Expr);
2299 Left_Opnd => Make_Identifier (Loc, Name_uE),
2302 -- Map entry queue indices in the range of the current family
2303 -- into the current index, that designates the entry body.
2307 Make_Implicit_If_Statement (Typ,
2309 Then_Statements => Stats,
2310 Elsif_Parts => New_List);
2316 Make_Elsif_Part (Loc,
2318 Then_Statements => Stats),
2319 Elsif_Parts (If_St));
2323 ------------------------------
2324 -- Convert_Discriminant_Ref --
2325 ------------------------------
2327 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
2331 if Is_Entity_Name (Bound)
2332 and then Ekind (Entity (Bound)) = E_Discriminant
2335 Make_Selected_Component (Loc,
2337 Unchecked_Convert_To (Corresponding_Record_Type (Typ),
2338 Make_Explicit_Dereference (Loc,
2339 Make_Identifier (Loc, Name_uObject))),
2340 Selector_Name => Make_Identifier (Loc, Chars (Bound)));
2341 Set_Etype (B, Etype (Entity (Bound)));
2343 B := New_Copy_Tree (Bound);
2347 end Convert_Discriminant_Ref;
2349 -- Start of processing for Build_Find_Body_Index
2352 Spec := Build_Find_Body_Index_Spec (Typ);
2354 Ent := First_Entity (Typ);
2355 while Present (Ent) loop
2356 if Ekind (Ent) = E_Entry_Family then
2366 -- If the protected type has no entry families, there is a one-one
2367 -- correspondence between entry queue and entry body.
2370 Make_Simple_Return_Statement (Loc,
2371 Expression => Make_Identifier (Loc, Name_uE));
2374 -- Suppose entries e1, e2, ... have size l1, l2, ... we generate
2377 -- if E <= l1 then return 1;
2378 -- elsif E <= l1 + l2 then return 2;
2383 Ent := First_Entity (Typ);
2385 Add_Object_Pointer (Loc, Typ, Decls);
2387 while Present (Ent) loop
2389 if Ekind (Ent) = E_Entry then
2390 Add_If_Clause (Make_Integer_Literal (Loc, 1));
2392 elsif Ekind (Ent) = E_Entry_Family then
2394 E_Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
2395 Hi := Convert_Discriminant_Ref (Type_High_Bound (E_Typ));
2396 Lo := Convert_Discriminant_Ref (Type_Low_Bound (E_Typ));
2397 Add_If_Clause (Family_Size (Loc, Hi, Lo, Typ, False));
2406 Make_Simple_Return_Statement (Loc,
2407 Expression => Make_Integer_Literal (Loc, 1));
2409 elsif Nkind (Ret) = N_If_Statement then
2411 -- Ranges are in increasing order, so last one doesn't need guard
2414 Nod : constant Node_Id := Last (Elsif_Parts (Ret));
2417 Set_Else_Statements (Ret, Then_Statements (Nod));
2423 Make_Subprogram_Body (Loc,
2424 Specification => Spec,
2425 Declarations => Decls,
2426 Handled_Statement_Sequence =>
2427 Make_Handled_Sequence_Of_Statements (Loc,
2428 Statements => New_List (Ret)));
2429 end Build_Find_Body_Index;
2431 --------------------------------
2432 -- Build_Find_Body_Index_Spec --
2433 --------------------------------
2435 function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id is
2436 Loc : constant Source_Ptr := Sloc (Typ);
2437 Id : constant Entity_Id :=
2438 Make_Defining_Identifier (Loc,
2439 Chars => New_External_Name (Chars (Typ), 'F'));
2440 Parm1 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uO);
2441 Parm2 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uE);
2445 Make_Function_Specification (Loc,
2446 Defining_Unit_Name => Id,
2447 Parameter_Specifications => New_List (
2448 Make_Parameter_Specification (Loc,
2449 Defining_Identifier => Parm1,
2451 New_Reference_To (RTE (RE_Address), Loc)),
2453 Make_Parameter_Specification (Loc,
2454 Defining_Identifier => Parm2,
2456 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))),
2457 Result_Definition => New_Occurrence_Of (
2458 RTE (RE_Protected_Entry_Index), Loc));
2459 end Build_Find_Body_Index_Spec;
2461 -------------------------
2462 -- Build_Master_Entity --
2463 -------------------------
2465 procedure Build_Master_Entity (E : Entity_Id) is
2466 Loc : constant Source_Ptr := Sloc (E);
2474 -- Ada 2005 (AI-287): Do not set/get the has_master_entity reminder
2475 -- in internal scopes, unless present already.. Required for nested
2476 -- limited aggregates, where the expansion of task components may
2477 -- generate inner blocks. If the block is the rewriting of a call
2478 -- or the scope is an extended return statement this is valid master.
2479 -- The master in an extended return is only used within the return,
2480 -- and is subsequently overwritten in Move_Activation_Chain, but it
2483 if Ada_Version >= Ada_05 then
2484 while Is_Internal (S) loop
2485 if Nkind (Parent (S)) = N_Block_Statement
2487 Nkind (Original_Node (Parent (S))) = N_Procedure_Call_Statement
2490 elsif Ekind (S) = E_Return_Statement then
2498 -- Nothing to do if we already built a master entity for this scope
2499 -- or if there is no task hierarchy.
2501 if Has_Master_Entity (S)
2502 or else Restriction_Active (No_Task_Hierarchy)
2507 -- Otherwise first build the master entity
2508 -- _Master : constant Master_Id := Current_Master.all;
2509 -- and insert it just before the current declaration
2512 Make_Object_Declaration (Loc,
2513 Defining_Identifier =>
2514 Make_Defining_Identifier (Loc, Name_uMaster),
2515 Constant_Present => True,
2516 Object_Definition => New_Reference_To (RTE (RE_Master_Id), Loc),
2518 Make_Explicit_Dereference (Loc,
2519 New_Reference_To (RTE (RE_Current_Master), Loc)));
2522 Insert_Before (P, Decl);
2525 -- Ada 2005 (AI-287): Set the has_master_entity reminder in the
2526 -- non-internal scope selected above.
2528 if Ada_Version >= Ada_05 then
2529 Set_Has_Master_Entity (S);
2531 Set_Has_Master_Entity (Scope (E));
2534 -- Now mark the containing scope as a task master
2536 while Nkind (P) /= N_Compilation_Unit loop
2539 -- If we fall off the top, we are at the outer level, and the
2540 -- environment task is our effective master, so nothing to mark.
2543 (P, N_Task_Body, N_Block_Statement, N_Subprogram_Body)
2545 Set_Is_Task_Master (P, True);
2548 elsif Nkind (Parent (P)) = N_Subunit then
2549 P := Corresponding_Stub (Parent (P));
2552 end Build_Master_Entity;
2554 ---------------------------
2555 -- Build_Protected_Entry --
2556 ---------------------------
2558 function Build_Protected_Entry
2561 Pid : Node_Id) return Node_Id
2563 Loc : constant Source_Ptr := Sloc (N);
2565 Decls : constant List_Id := Declarations (N);
2566 End_Lab : constant Node_Id :=
2567 End_Label (Handled_Statement_Sequence (N));
2568 End_Loc : constant Source_Ptr :=
2569 Sloc (Last (Statements (Handled_Statement_Sequence (N))));
2570 -- Used for the generated call to Complete_Entry_Body
2572 Han_Loc : Source_Ptr;
2573 -- Used for the exception handler, inserted at end of the body
2575 Op_Decls : constant List_Id := New_List;
2583 -- Set the source location on the exception handler only when debugging
2584 -- the expanded code (see Make_Implicit_Exception_Handler).
2586 if Debug_Generated_Code then
2589 -- Otherwise the inserted code should not be visible to the debugger
2592 Han_Loc := No_Location;
2596 Make_Defining_Identifier (Loc,
2597 Chars => Chars (Protected_Body_Subprogram (Ent)));
2599 Build_Protected_Entry_Specification (Loc, Edef, Empty);
2601 -- Add the following declarations:
2602 -- type poVP is access poV;
2603 -- _object : poVP := poVP (_O);
2605 -- where _O is the formal parameter associated with the concurrent
2606 -- object. These declarations are needed for Complete_Entry_Body.
2608 Add_Object_Pointer (Loc, Pid, Op_Decls);
2610 -- Add renamings for all formals, the Protection object, discriminals,
2611 -- privals and the entry index constant for use by debugger.
2613 Add_Formal_Renamings (Espec, Op_Decls, Ent, Loc);
2614 Debug_Private_Data_Declarations (Decls);
2616 case Corresponding_Runtime_Package (Pid) is
2617 when System_Tasking_Protected_Objects_Entries =>
2619 New_Reference_To (RTE (RE_Complete_Entry_Body), Loc);
2621 when System_Tasking_Protected_Objects_Single_Entry =>
2623 New_Reference_To (RTE (RE_Complete_Single_Entry_Body), Loc);
2626 raise Program_Error;
2629 Op_Stats := New_List (
2630 Make_Block_Statement (Loc,
2631 Declarations => Decls,
2632 Handled_Statement_Sequence =>
2633 Handled_Statement_Sequence (N)),
2635 Make_Procedure_Call_Statement (End_Loc,
2637 Parameter_Associations => New_List (
2638 Make_Attribute_Reference (End_Loc,
2640 Make_Selected_Component (End_Loc,
2642 Make_Identifier (End_Loc, Name_uObject),
2644 Make_Identifier (End_Loc, Name_uObject)),
2645 Attribute_Name => Name_Unchecked_Access))));
2647 -- When exceptions can not be propagated, we never need to call
2648 -- Exception_Complete_Entry_Body
2650 if No_Exception_Handlers_Set then
2652 Make_Subprogram_Body (Loc,
2653 Specification => Espec,
2654 Declarations => Op_Decls,
2655 Handled_Statement_Sequence =>
2656 Make_Handled_Sequence_Of_Statements (Loc,
2657 Statements => Op_Stats,
2658 End_Label => End_Lab));
2661 Ohandle := Make_Others_Choice (Loc);
2662 Set_All_Others (Ohandle);
2664 case Corresponding_Runtime_Package (Pid) is
2665 when System_Tasking_Protected_Objects_Entries =>
2668 (RTE (RE_Exceptional_Complete_Entry_Body), Loc);
2670 when System_Tasking_Protected_Objects_Single_Entry =>
2673 (RTE (RE_Exceptional_Complete_Single_Entry_Body), Loc);
2676 raise Program_Error;
2679 -- Create body of entry procedure. The renaming declarations are
2680 -- placed ahead of the block that contains the actual entry body.
2683 Make_Subprogram_Body (Loc,
2684 Specification => Espec,
2685 Declarations => Op_Decls,
2686 Handled_Statement_Sequence =>
2687 Make_Handled_Sequence_Of_Statements (Loc,
2688 Statements => Op_Stats,
2689 End_Label => End_Lab,
2690 Exception_Handlers => New_List (
2691 Make_Implicit_Exception_Handler (Han_Loc,
2692 Exception_Choices => New_List (Ohandle),
2694 Statements => New_List (
2695 Make_Procedure_Call_Statement (Han_Loc,
2697 Parameter_Associations => New_List (
2698 Make_Attribute_Reference (Han_Loc,
2700 Make_Selected_Component (Han_Loc,
2702 Make_Identifier (Han_Loc, Name_uObject),
2704 Make_Identifier (Han_Loc, Name_uObject)),
2705 Attribute_Name => Name_Unchecked_Access),
2707 Make_Function_Call (Han_Loc,
2708 Name => New_Reference_To (
2709 RTE (RE_Get_GNAT_Exception), Loc)))))))));
2711 end Build_Protected_Entry;
2713 -----------------------------------------
2714 -- Build_Protected_Entry_Specification --
2715 -----------------------------------------
2717 function Build_Protected_Entry_Specification
2720 Ent_Id : Entity_Id) return Node_Id
2722 P : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uP);
2725 Set_Debug_Info_Needed (Def_Id);
2727 if Present (Ent_Id) then
2728 Append_Elmt (P, Accept_Address (Ent_Id));
2732 Make_Procedure_Specification (Loc,
2733 Defining_Unit_Name => Def_Id,
2734 Parameter_Specifications => New_List (
2735 Make_Parameter_Specification (Loc,
2736 Defining_Identifier =>
2737 Make_Defining_Identifier (Loc, Name_uO),
2739 New_Reference_To (RTE (RE_Address), Loc)),
2741 Make_Parameter_Specification (Loc,
2742 Defining_Identifier => P,
2744 New_Reference_To (RTE (RE_Address), Loc)),
2746 Make_Parameter_Specification (Loc,
2747 Defining_Identifier =>
2748 Make_Defining_Identifier (Loc, Name_uE),
2750 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))));
2751 end Build_Protected_Entry_Specification;
2753 --------------------------
2754 -- Build_Protected_Spec --
2755 --------------------------
2757 function Build_Protected_Spec
2759 Obj_Type : Entity_Id;
2761 Unprotected : Boolean := False) return List_Id
2763 Loc : constant Source_Ptr := Sloc (N);
2766 New_Plist : List_Id;
2767 New_Param : Node_Id;
2770 New_Plist := New_List;
2772 Formal := First_Formal (Ident);
2773 while Present (Formal) loop
2775 Make_Parameter_Specification (Loc,
2776 Defining_Identifier =>
2777 Make_Defining_Identifier (Sloc (Formal), Chars (Formal)),
2778 In_Present => In_Present (Parent (Formal)),
2779 Out_Present => Out_Present (Parent (Formal)),
2780 Parameter_Type => New_Reference_To (Etype (Formal), Loc));
2783 Set_Protected_Formal (Formal, Defining_Identifier (New_Param));
2786 Append (New_Param, New_Plist);
2787 Next_Formal (Formal);
2790 -- If the subprogram is a procedure and the context is not an access
2791 -- to protected subprogram, the parameter is in-out. Otherwise it is
2795 Make_Parameter_Specification (Loc,
2796 Defining_Identifier =>
2797 Make_Defining_Identifier (Loc, Name_uObject),
2800 (Etype (Ident) = Standard_Void_Type
2801 and then not Is_RTE (Obj_Type, RE_Address)),
2803 New_Reference_To (Obj_Type, Loc));
2804 Set_Debug_Info_Needed (Defining_Identifier (Decl));
2805 Prepend_To (New_Plist, Decl);
2808 end Build_Protected_Spec;
2810 ---------------------------------------
2811 -- Build_Protected_Sub_Specification --
2812 ---------------------------------------
2814 function Build_Protected_Sub_Specification
2816 Prot_Typ : Entity_Id;
2817 Mode : Subprogram_Protection_Mode) return Node_Id
2819 Loc : constant Source_Ptr := Sloc (N);
2823 New_Plist : List_Id;
2826 Append_Chr : constant array (Subprogram_Protection_Mode) of Character :=
2827 (Dispatching_Mode => ' ',
2828 Protected_Mode => 'P',
2829 Unprotected_Mode => 'N');
2832 if Ekind (Defining_Unit_Name (Specification (N))) =
2835 Decl := Unit_Declaration_Node (Corresponding_Spec (N));
2840 Def_Id := Defining_Unit_Name (Specification (Decl));
2843 Build_Protected_Spec
2844 (Decl, Corresponding_Record_Type (Prot_Typ), Def_Id,
2845 Mode = Unprotected_Mode);
2847 Make_Defining_Identifier (Loc,
2848 Chars => Build_Selected_Name (Prot_Typ, Def_Id, Append_Chr (Mode)));
2850 -- The unprotected operation carries the user code, and debugging
2851 -- information must be generated for it, even though this spec does
2852 -- not come from source. It is also convenient to allow gdb to step
2853 -- into the protected operation, even though it only contains lock/
2856 Set_Debug_Info_Needed (New_Id);
2858 -- If a pragma Eliminate applies to the source entity, the internal
2859 -- subprograms will be eliminated as well.
2861 Set_Is_Eliminated (New_Id, Is_Eliminated (Def_Id));
2863 if Nkind (Specification (Decl)) = N_Procedure_Specification then
2865 Make_Procedure_Specification (Loc,
2866 Defining_Unit_Name => New_Id,
2867 Parameter_Specifications => New_Plist);
2869 -- Create a new specification for the anonymous subprogram type
2873 Make_Function_Specification (Loc,
2874 Defining_Unit_Name => New_Id,
2875 Parameter_Specifications => New_Plist,
2876 Result_Definition =>
2877 Copy_Result_Type (Result_Definition (Specification (Decl))));
2879 Set_Return_Present (Defining_Unit_Name (New_Spec));
2883 end Build_Protected_Sub_Specification;
2885 -------------------------------------
2886 -- Build_Protected_Subprogram_Body --
2887 -------------------------------------
2889 function Build_Protected_Subprogram_Body
2892 N_Op_Spec : Node_Id) return Node_Id
2894 Loc : constant Source_Ptr := Sloc (N);
2896 P_Op_Spec : Node_Id;
2899 Unprot_Call : Node_Id;
2901 Lock_Name : Node_Id;
2902 Lock_Stmt : Node_Id;
2903 Service_Name : Node_Id;
2905 Return_Stmt : Node_Id := Empty; -- init to avoid gcc 3 warning
2906 Pre_Stmts : List_Id := No_List; -- init to avoid gcc 3 warning
2908 Object_Parm : Node_Id;
2911 function Is_Exception_Safe (Subprogram : Node_Id) return Boolean;
2912 -- Tell whether a given subprogram cannot raise an exception
2914 -----------------------
2915 -- Is_Exception_Safe --
2916 -----------------------
2918 function Is_Exception_Safe (Subprogram : Node_Id) return Boolean is
2920 function Has_Side_Effect (N : Node_Id) return Boolean;
2921 -- Return True whenever encountering a subprogram call or raise
2922 -- statement of any kind in the sequence of statements
2924 ---------------------
2925 -- Has_Side_Effect --
2926 ---------------------
2928 -- What is this doing buried two levels down in exp_ch9. It seems
2929 -- like a generally useful function, and indeed there may be code
2930 -- duplication going on here ???
2932 function Has_Side_Effect (N : Node_Id) return Boolean is
2936 function Is_Call_Or_Raise (N : Node_Id) return Boolean;
2937 -- Indicate whether N is a subprogram call or a raise statement
2939 ----------------------
2940 -- Is_Call_Or_Raise --
2941 ----------------------
2943 function Is_Call_Or_Raise (N : Node_Id) return Boolean is
2945 return Nkind_In (N, N_Procedure_Call_Statement,
2948 N_Raise_Constraint_Error,
2949 N_Raise_Program_Error,
2950 N_Raise_Storage_Error);
2951 end Is_Call_Or_Raise;
2953 -- Start of processing for Has_Side_Effect
2957 while Present (Stmt) loop
2958 if Is_Call_Or_Raise (Stmt) then
2962 -- An object declaration can also contain a function call
2963 -- or a raise statement
2965 if Nkind (Stmt) = N_Object_Declaration then
2966 Expr := Expression (Stmt);
2968 if Present (Expr) and then Is_Call_Or_Raise (Expr) then
2977 end Has_Side_Effect;
2979 -- Start of processing for Is_Exception_Safe
2982 -- If the checks handled by the back end are not disabled, we cannot
2983 -- ensure that no exception will be raised.
2985 if not Access_Checks_Suppressed (Empty)
2986 or else not Discriminant_Checks_Suppressed (Empty)
2987 or else not Range_Checks_Suppressed (Empty)
2988 or else not Index_Checks_Suppressed (Empty)
2989 or else Opt.Stack_Checking_Enabled
2994 if Has_Side_Effect (First (Declarations (Subprogram)))
2997 First (Statements (Handled_Statement_Sequence (Subprogram))))
3003 end Is_Exception_Safe;
3005 -- Start of processing for Build_Protected_Subprogram_Body
3008 Op_Spec := Specification (N);
3009 Exc_Safe := Is_Exception_Safe (N);
3012 Build_Protected_Sub_Specification (N, Pid, Protected_Mode);
3014 -- Build a list of the formal parameters of the protected version of
3015 -- the subprogram to use as the actual parameters of the unprotected
3018 Uactuals := New_List;
3019 Pformal := First (Parameter_Specifications (P_Op_Spec));
3020 while Present (Pformal) loop
3022 Make_Identifier (Loc, Chars (Defining_Identifier (Pformal))),
3027 -- Make a call to the unprotected version of the subprogram built above
3028 -- for use by the protected version built below.
3030 if Nkind (Op_Spec) = N_Function_Specification then
3032 R := Make_Defining_Identifier (Loc, New_Internal_Name ('R'));
3034 Make_Object_Declaration (Loc,
3035 Defining_Identifier => R,
3036 Constant_Present => True,
3037 Object_Definition => New_Copy (Result_Definition (N_Op_Spec)),
3039 Make_Function_Call (Loc,
3040 Name => Make_Identifier (Loc,
3041 Chars (Defining_Unit_Name (N_Op_Spec))),
3042 Parameter_Associations => Uactuals));
3043 Return_Stmt := Make_Simple_Return_Statement (Loc,
3044 Expression => New_Reference_To (R, Loc));
3047 Unprot_Call := Make_Simple_Return_Statement (Loc,
3048 Expression => Make_Function_Call (Loc,
3050 Make_Identifier (Loc,
3051 Chars (Defining_Unit_Name (N_Op_Spec))),
3052 Parameter_Associations => Uactuals));
3057 Make_Procedure_Call_Statement (Loc,
3059 Make_Identifier (Loc,
3060 Chars (Defining_Unit_Name (N_Op_Spec))),
3061 Parameter_Associations => Uactuals);
3064 -- Wrap call in block that will be covered by an at_end handler
3066 if not Exc_Safe then
3067 Unprot_Call := Make_Block_Statement (Loc,
3068 Handled_Statement_Sequence =>
3069 Make_Handled_Sequence_Of_Statements (Loc,
3070 Statements => New_List (Unprot_Call)));
3073 -- Make the protected subprogram body. This locks the protected
3074 -- object and calls the unprotected version of the subprogram.
3076 case Corresponding_Runtime_Package (Pid) is
3077 when System_Tasking_Protected_Objects_Entries =>
3078 Lock_Name := New_Reference_To (RTE (RE_Lock_Entries), Loc);
3079 Service_Name := New_Reference_To (RTE (RE_Service_Entries), Loc);
3081 when System_Tasking_Protected_Objects_Single_Entry =>
3082 Lock_Name := New_Reference_To (RTE (RE_Lock_Entry), Loc);
3083 Service_Name := New_Reference_To (RTE (RE_Service_Entry), Loc);
3085 when System_Tasking_Protected_Objects =>
3086 Lock_Name := New_Reference_To (RTE (RE_Lock), Loc);
3087 Service_Name := New_Reference_To (RTE (RE_Unlock), Loc);
3090 raise Program_Error;
3094 Make_Attribute_Reference (Loc,
3096 Make_Selected_Component (Loc,
3098 Make_Identifier (Loc, Name_uObject),
3100 Make_Identifier (Loc, Name_uObject)),
3101 Attribute_Name => Name_Unchecked_Access);
3103 Lock_Stmt := Make_Procedure_Call_Statement (Loc,
3105 Parameter_Associations => New_List (Object_Parm));
3107 if Abort_Allowed then
3109 Make_Procedure_Call_Statement (Loc,
3110 Name => New_Reference_To (RTE (RE_Abort_Defer), Loc),
3111 Parameter_Associations => Empty_List),
3115 Stmts := New_List (Lock_Stmt);
3118 if not Exc_Safe then
3119 Append (Unprot_Call, Stmts);
3121 if Nkind (Op_Spec) = N_Function_Specification then
3123 Stmts := Empty_List;
3125 Append (Unprot_Call, Stmts);
3129 Make_Procedure_Call_Statement (Loc,
3130 Name => Service_Name,
3131 Parameter_Associations =>
3132 New_List (New_Copy_Tree (Object_Parm))),
3135 if Abort_Allowed then
3137 Make_Procedure_Call_Statement (Loc,
3138 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc),
3139 Parameter_Associations => Empty_List),
3143 if Nkind (Op_Spec) = N_Function_Specification then
3144 Append (Return_Stmt, Stmts);
3145 Append (Make_Block_Statement (Loc,
3146 Declarations => New_List (Unprot_Call),
3147 Handled_Statement_Sequence =>
3148 Make_Handled_Sequence_Of_Statements (Loc,
3149 Statements => Stmts)), Pre_Stmts);
3155 Make_Subprogram_Body (Loc,
3156 Declarations => Empty_List,
3157 Specification => P_Op_Spec,
3158 Handled_Statement_Sequence =>
3159 Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts));
3161 if not Exc_Safe then
3162 Set_Is_Protected_Subprogram_Body (Sub_Body);
3166 end Build_Protected_Subprogram_Body;
3168 -------------------------------------
3169 -- Build_Protected_Subprogram_Call --
3170 -------------------------------------
3172 procedure Build_Protected_Subprogram_Call
3176 External : Boolean := True)
3178 Loc : constant Source_Ptr := Sloc (N);
3179 Sub : constant Entity_Id := Entity (Name);
3185 New_Sub := New_Occurrence_Of (External_Subprogram (Sub), Loc);
3188 New_Occurrence_Of (Protected_Body_Subprogram (Sub), Loc);
3191 if Present (Parameter_Associations (N)) then
3192 Params := New_Copy_List_Tree (Parameter_Associations (N));
3197 -- If the type is an untagged derived type, convert to the root type,
3198 -- which is the one on which the operations are defined.
3200 if Nkind (Rec) = N_Unchecked_Type_Conversion
3201 and then not Is_Tagged_Type (Etype (Rec))
3202 and then Is_Derived_Type (Etype (Rec))
3204 Set_Etype (Rec, Root_Type (Etype (Rec)));
3205 Set_Subtype_Mark (Rec,
3206 New_Occurrence_Of (Root_Type (Etype (Rec)), Sloc (N)));
3209 Prepend (Rec, Params);
3211 if Ekind (Sub) = E_Procedure then
3213 Make_Procedure_Call_Statement (Loc,
3215 Parameter_Associations => Params));
3218 pragma Assert (Ekind (Sub) = E_Function);
3220 Make_Function_Call (Loc,
3222 Parameter_Associations => Params));
3226 and then Nkind (Rec) = N_Unchecked_Type_Conversion
3227 and then Is_Entity_Name (Expression (Rec))
3228 and then Is_Shared_Passive (Entity (Expression (Rec)))
3230 Add_Shared_Var_Lock_Procs (N);
3232 end Build_Protected_Subprogram_Call;
3234 -------------------------
3235 -- Build_Selected_Name --
3236 -------------------------
3238 function Build_Selected_Name
3239 (Prefix : Entity_Id;
3240 Selector : Entity_Id;
3241 Append_Char : Character := ' ') return Name_Id
3243 Select_Buffer : String (1 .. Hostparm.Max_Name_Length);
3244 Select_Len : Natural;
3247 Get_Name_String (Chars (Selector));
3248 Select_Len := Name_Len;
3249 Select_Buffer (1 .. Select_Len) := Name_Buffer (1 .. Name_Len);
3250 Get_Name_String (Chars (Prefix));
3252 -- If scope is anonymous type, discard suffix to recover name of
3253 -- single protected object. Otherwise use protected type name.
3255 if Name_Buffer (Name_Len) = 'T' then
3256 Name_Len := Name_Len - 1;
3259 Add_Str_To_Name_Buffer ("__");
3260 for J in 1 .. Select_Len loop
3261 Add_Char_To_Name_Buffer (Select_Buffer (J));
3264 -- Now add the Append_Char if specified. The encoding to follow
3265 -- depends on the type of entity. If Append_Char is either 'N' or 'P',
3266 -- then the entity is associated to a protected type subprogram.
3267 -- Otherwise, it is a protected type entry. For each case, the
3268 -- encoding to follow for the suffix is documented in exp_dbug.ads.
3270 -- It would be better to encapsulate this as a routine in Exp_Dbug ???
3272 if Append_Char /= ' ' then
3273 if Append_Char = 'P' or Append_Char = 'N' then
3274 Add_Char_To_Name_Buffer (Append_Char);
3277 Add_Str_To_Name_Buffer ((1 => '_', 2 => Append_Char));
3278 return New_External_Name (Name_Find, ' ', -1);
3283 end Build_Selected_Name;
3285 -----------------------------
3286 -- Build_Simple_Entry_Call --
3287 -----------------------------
3289 -- A task entry call is converted to a call to Call_Simple
3292 -- P : parms := (parm, parm, parm);
3294 -- Call_Simple (acceptor-task, entry-index, P'Address);
3300 -- Here Pnn is an aggregate of the type constructed for the entry to hold
3301 -- the parameters, and the constructed aggregate value contains either the
3302 -- parameters or, in the case of non-elementary types, references to these
3303 -- parameters. Then the address of this aggregate is passed to the runtime
3304 -- routine, along with the task id value and the task entry index value.
3305 -- Pnn is only required if parameters are present.
3307 -- The assignments after the call are present only in the case of in-out
3308 -- or out parameters for elementary types, and are used to assign back the
3309 -- resulting values of such parameters.
3311 -- Note: the reason that we insert a block here is that in the context
3312 -- of selects, conditional entry calls etc. the entry call statement
3313 -- appears on its own, not as an element of a list.
3315 -- A protected entry call is converted to a Protected_Entry_Call:
3318 -- P : E1_Params := (param, param, param);
3320 -- Bnn : Communications_Block;
3323 -- P : E1_Params := (param, param, param);
3324 -- Bnn : Communications_Block;
3327 -- Protected_Entry_Call (
3328 -- Object => po._object'Access,
3329 -- E => <entry index>;
3330 -- Uninterpreted_Data => P'Address;
3331 -- Mode => Simple_Call;
3338 procedure Build_Simple_Entry_Call
3347 -- If call has been inlined, nothing left to do
3349 if Nkind (N) = N_Block_Statement then
3353 -- Convert entry call to Call_Simple call
3356 Loc : constant Source_Ptr := Sloc (N);
3357 Parms : constant List_Id := Parameter_Associations (N);
3358 Stats : constant List_Id := New_List;
3361 Comm_Name : Entity_Id;
3365 Ent_Acc : Entity_Id;
3367 Iface_Tag : Entity_Id;
3368 Iface_Typ : Entity_Id;
3381 -- Simple entry and entry family cases merge here
3383 Ent := Entity (Ename);
3384 Ent_Acc := Entry_Parameters_Type (Ent);
3385 Conctyp := Etype (Concval);
3387 -- If prefix is an access type, dereference to obtain the task type
3389 if Is_Access_Type (Conctyp) then
3390 Conctyp := Designated_Type (Conctyp);
3393 -- Special case for protected subprogram calls
3395 if Is_Protected_Type (Conctyp)
3396 and then Is_Subprogram (Entity (Ename))
3398 if not Is_Eliminated (Entity (Ename)) then
3399 Build_Protected_Subprogram_Call
3400 (N, Ename, Convert_Concurrent (Concval, Conctyp));
3407 -- First parameter is the Task_Id value from the task value or the
3408 -- Object from the protected object value, obtained by selecting
3409 -- the _Task_Id or _Object from the result of doing an unchecked
3410 -- conversion to convert the value to the corresponding record type.
3412 if Nkind (Concval) = N_Function_Call
3413 and then Is_Task_Type (Conctyp)
3414 and then Ada_Version >= Ada_05
3417 Obj : constant Entity_Id :=
3418 Make_Defining_Identifier (Loc, New_Internal_Name ('F'));
3423 Make_Object_Declaration (Loc,
3424 Defining_Identifier => Obj,
3425 Object_Definition => New_Occurrence_Of (Conctyp, Loc),
3426 Expression => Relocate_Node (Concval));
3427 Set_Etype (Obj, Conctyp);
3428 Decls := New_List (Decl);
3429 Rewrite (Concval, New_Occurrence_Of (Obj, Loc));
3436 Parm1 := Concurrent_Ref (Concval);
3438 -- Second parameter is the entry index, computed by the routine
3439 -- provided for this purpose. The value of this expression is
3440 -- assigned to an intermediate variable to assure that any entry
3441 -- family index expressions are evaluated before the entry
3445 or else Restriction_Active (No_Entry_Queue) = False
3446 or else not Is_Protected_Type (Conctyp)
3447 or else Number_Entries (Conctyp) > 1
3448 or else (Has_Attach_Handler (Conctyp)
3449 and then not Restricted_Profile)
3451 X := Make_Defining_Identifier (Loc, Name_uX);
3454 Make_Object_Declaration (Loc,
3455 Defining_Identifier => X,
3456 Object_Definition =>
3457 New_Reference_To (RTE (RE_Task_Entry_Index), Loc),
3458 Expression => Actual_Index_Expression (
3459 Loc, Entity (Ename), Index, Concval));
3461 Append_To (Decls, Xdecl);
3462 Parm2 := New_Reference_To (X, Loc);
3469 -- The third parameter is the packaged parameters. If there are
3470 -- none, then it is just the null address, since nothing is passed.
3473 Parm3 := New_Reference_To (RTE (RE_Null_Address), Loc);
3476 -- Case of parameters present, where third argument is the address
3477 -- of a packaged record containing the required parameter values.
3480 -- First build a list of parameter values, which are references to
3481 -- objects of the parameter types.
3485 Actual := First_Actual (N);
3486 Formal := First_Formal (Ent);
3488 while Present (Actual) loop
3490 -- If it is a by_copy_type, copy it to a new variable. The
3491 -- packaged record has a field that points to this variable.
3493 if Is_By_Copy_Type (Etype (Actual)) then
3495 Make_Object_Declaration (Loc,
3496 Defining_Identifier =>
3497 Make_Defining_Identifier (Loc,
3498 Chars => New_Internal_Name ('J')),
3499 Aliased_Present => True,
3500 Object_Definition =>
3501 New_Reference_To (Etype (Formal), Loc));
3503 -- Mark the object as not needing initialization since the
3504 -- initialization is performed separately, avoiding errors
3505 -- on cases such as formals of null-excluding access types.
3507 Set_No_Initialization (N_Node);
3509 -- We must make an assignment statement separate for the
3510 -- case of limited type. We cannot assign it unless the
3511 -- Assignment_OK flag is set first. An out formal of an
3512 -- access type must also be initialized from the actual,
3513 -- as stated in RM 6.4.1 (13).
3515 if Ekind (Formal) /= E_Out_Parameter
3516 or else Is_Access_Type (Etype (Formal))
3519 New_Reference_To (Defining_Identifier (N_Node), Loc);
3520 Set_Assignment_OK (N_Var);
3522 Make_Assignment_Statement (Loc,
3524 Expression => Relocate_Node (Actual)));
3527 Append (N_Node, Decls);
3530 Make_Attribute_Reference (Loc,
3531 Attribute_Name => Name_Unchecked_Access,
3533 New_Reference_To (Defining_Identifier (N_Node), Loc)));
3535 -- Interface class-wide formal
3537 if Ada_Version >= Ada_05
3538 and then Ekind (Etype (Formal)) = E_Class_Wide_Type
3539 and then Is_Interface (Etype (Formal))
3541 Iface_Typ := Etype (Etype (Formal));
3544 -- formal_iface_type! (actual.iface_tag)'reference
3547 Find_Interface_Tag (Etype (Actual), Iface_Typ);
3548 pragma Assert (Present (Iface_Tag));
3551 Make_Reference (Loc,
3552 Unchecked_Convert_To (Iface_Typ,
3553 Make_Selected_Component (Loc,
3555 Relocate_Node (Actual),
3557 New_Reference_To (Iface_Tag, Loc)))));
3563 Make_Reference (Loc, Relocate_Node (Actual)));
3567 Next_Actual (Actual);
3568 Next_Formal_With_Extras (Formal);
3571 -- Now build the declaration of parameters initialized with the
3572 -- aggregate containing this constructed parameter list.
3574 P := Make_Defining_Identifier (Loc, Name_uP);
3577 Make_Object_Declaration (Loc,
3578 Defining_Identifier => P,
3579 Object_Definition =>
3580 New_Reference_To (Designated_Type (Ent_Acc), Loc),
3582 Make_Aggregate (Loc, Expressions => Plist));
3585 Make_Attribute_Reference (Loc,
3586 Prefix => New_Reference_To (P, Loc),
3587 Attribute_Name => Name_Address);
3589 Append (Pdecl, Decls);
3592 -- Now we can create the call, case of protected type
3594 if Is_Protected_Type (Conctyp) then
3595 case Corresponding_Runtime_Package (Conctyp) is
3596 when System_Tasking_Protected_Objects_Entries =>
3598 -- Change the type of the index declaration
3600 Set_Object_Definition (Xdecl,
3601 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc));
3603 -- Some additional declarations for protected entry calls
3609 -- Bnn : Communications_Block;
3612 Make_Defining_Identifier (Loc, New_Internal_Name ('B'));
3615 Make_Object_Declaration (Loc,
3616 Defining_Identifier => Comm_Name,
3617 Object_Definition =>
3618 New_Reference_To (RTE (RE_Communication_Block), Loc)));
3620 -- Some additional statements for protected entry calls
3622 -- Protected_Entry_Call (
3623 -- Object => po._object'Access,
3624 -- E => <entry index>;
3625 -- Uninterpreted_Data => P'Address;
3626 -- Mode => Simple_Call;
3630 Make_Procedure_Call_Statement (Loc,
3632 New_Reference_To (RTE (RE_Protected_Entry_Call), Loc),
3634 Parameter_Associations => New_List (
3635 Make_Attribute_Reference (Loc,
3636 Attribute_Name => Name_Unchecked_Access,
3640 New_Reference_To (RTE (RE_Simple_Call), Loc),
3641 New_Occurrence_Of (Comm_Name, Loc)));
3643 when System_Tasking_Protected_Objects_Single_Entry =>
3644 -- Protected_Single_Entry_Call (
3645 -- Object => po._object'Access,
3646 -- Uninterpreted_Data => P'Address;
3647 -- Mode => Simple_Call);
3650 Make_Procedure_Call_Statement (Loc,
3651 Name => New_Reference_To (
3652 RTE (RE_Protected_Single_Entry_Call), Loc),
3654 Parameter_Associations => New_List (
3655 Make_Attribute_Reference (Loc,
3656 Attribute_Name => Name_Unchecked_Access,
3659 New_Reference_To (RTE (RE_Simple_Call), Loc)));
3662 raise Program_Error;
3665 -- Case of task type
3669 Make_Procedure_Call_Statement (Loc,
3670 Name => New_Reference_To (RTE (RE_Call_Simple), Loc),
3671 Parameter_Associations => New_List (Parm1, Parm2, Parm3));
3675 Append_To (Stats, Call);
3677 -- If there are out or in/out parameters by copy add assignment
3678 -- statements for the result values.
3680 if Present (Parms) then
3681 Actual := First_Actual (N);
3682 Formal := First_Formal (Ent);
3684 Set_Assignment_OK (Actual);
3685 while Present (Actual) loop
3686 if Is_By_Copy_Type (Etype (Actual))
3687 and then Ekind (Formal) /= E_In_Parameter
3690 Make_Assignment_Statement (Loc,
3691 Name => New_Copy (Actual),
3693 Make_Explicit_Dereference (Loc,
3694 Make_Selected_Component (Loc,
3695 Prefix => New_Reference_To (P, Loc),
3697 Make_Identifier (Loc, Chars (Formal)))));
3699 -- In all cases (including limited private types) we want
3700 -- the assignment to be valid.
3702 Set_Assignment_OK (Name (N_Node));
3704 -- If the call is the triggering alternative in an
3705 -- asynchronous select, or the entry_call alternative of a
3706 -- conditional entry call, the assignments for in-out
3707 -- parameters are incorporated into the statement list that
3708 -- follows, so that there are executed only if the entry
3711 if (Nkind (Parent (N)) = N_Triggering_Alternative
3712 and then N = Triggering_Statement (Parent (N)))
3714 (Nkind (Parent (N)) = N_Entry_Call_Alternative
3715 and then N = Entry_Call_Statement (Parent (N)))
3717 if No (Statements (Parent (N))) then
3718 Set_Statements (Parent (N), New_List);
3721 Prepend (N_Node, Statements (Parent (N)));
3724 Insert_After (Call, N_Node);
3728 Next_Actual (Actual);
3729 Next_Formal_With_Extras (Formal);
3733 -- Finally, create block and analyze it
3736 Make_Block_Statement (Loc,
3737 Declarations => Decls,
3738 Handled_Statement_Sequence =>
3739 Make_Handled_Sequence_Of_Statements (Loc,
3740 Statements => Stats)));
3744 end Build_Simple_Entry_Call;
3746 --------------------------------
3747 -- Build_Task_Activation_Call --
3748 --------------------------------
3750 procedure Build_Task_Activation_Call (N : Node_Id) is
3751 Loc : constant Source_Ptr := Sloc (N);
3758 -- Get the activation chain entity. Except in the case of a package
3759 -- body, this is in the node that was passed. For a package body, we
3760 -- have to find the corresponding package declaration node.
3762 if Nkind (N) = N_Package_Body then
3763 P := Corresponding_Spec (N);
3766 exit when Nkind (P) = N_Package_Declaration;
3769 Chain := Activation_Chain_Entity (P);
3772 Chain := Activation_Chain_Entity (N);
3775 if Present (Chain) then
3776 if Restricted_Profile then
3777 Name := New_Reference_To (RTE (RE_Activate_Restricted_Tasks), Loc);
3779 Name := New_Reference_To (RTE (RE_Activate_Tasks), Loc);
3783 Make_Procedure_Call_Statement (Loc,
3785 Parameter_Associations =>
3786 New_List (Make_Attribute_Reference (Loc,
3787 Prefix => New_Occurrence_Of (Chain, Loc),
3788 Attribute_Name => Name_Unchecked_Access)));
3790 if Nkind (N) = N_Package_Declaration then
3791 if Present (Corresponding_Body (N)) then
3794 elsif Present (Private_Declarations (Specification (N))) then
3795 Append (Call, Private_Declarations (Specification (N)));
3798 Append (Call, Visible_Declarations (Specification (N)));
3802 if Present (Handled_Statement_Sequence (N)) then
3804 -- The call goes at the start of the statement sequence
3805 -- after the start of exception range label if one is present.
3811 Stm := First (Statements (Handled_Statement_Sequence (N)));
3813 -- A special case, skip exception range label if one is
3814 -- present (from front end zcx processing).
3816 if Nkind (Stm) = N_Label and then Exception_Junk (Stm) then
3820 -- Another special case, if the first statement is a block
3821 -- from optimization of a local raise to a goto, then the
3822 -- call goes inside this block.
3824 if Nkind (Stm) = N_Block_Statement
3825 and then Exception_Junk (Stm)
3828 First (Statements (Handled_Statement_Sequence (Stm)));
3831 -- Insertion point is after any exception label pushes,
3832 -- since we want it covered by any local handlers.
3834 while Nkind (Stm) in N_Push_xxx_Label loop
3838 -- Now we have the proper insertion point
3840 Insert_Before (Stm, Call);
3844 Set_Handled_Statement_Sequence (N,
3845 Make_Handled_Sequence_Of_Statements (Loc,
3846 Statements => New_List (Call)));
3851 Check_Task_Activation (N);
3853 end Build_Task_Activation_Call;
3855 -------------------------------
3856 -- Build_Task_Allocate_Block --
3857 -------------------------------
3859 procedure Build_Task_Allocate_Block
3864 T : constant Entity_Id := Entity (Expression (N));
3865 Init : constant Entity_Id := Base_Init_Proc (T);
3866 Loc : constant Source_Ptr := Sloc (N);
3867 Chain : constant Entity_Id :=
3868 Make_Defining_Identifier (Loc, Name_uChain);
3874 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
3877 Make_Block_Statement (Loc,
3878 Identifier => New_Reference_To (Blkent, Loc),
3879 Declarations => New_List (
3881 -- _Chain : Activation_Chain;
3883 Make_Object_Declaration (Loc,
3884 Defining_Identifier => Chain,
3885 Aliased_Present => True,
3886 Object_Definition =>
3887 New_Reference_To (RTE (RE_Activation_Chain), Loc))),
3889 Handled_Statement_Sequence =>
3890 Make_Handled_Sequence_Of_Statements (Loc,
3892 Statements => New_List (
3896 Make_Procedure_Call_Statement (Loc,
3897 Name => New_Reference_To (Init, Loc),
3898 Parameter_Associations => Args),
3900 -- Activate_Tasks (_Chain);
3902 Make_Procedure_Call_Statement (Loc,
3903 Name => New_Reference_To (RTE (RE_Activate_Tasks), Loc),
3904 Parameter_Associations => New_List (
3905 Make_Attribute_Reference (Loc,
3906 Prefix => New_Reference_To (Chain, Loc),
3907 Attribute_Name => Name_Unchecked_Access))))),
3909 Has_Created_Identifier => True,
3910 Is_Task_Allocation_Block => True);
3913 Make_Implicit_Label_Declaration (Loc,
3914 Defining_Identifier => Blkent,
3915 Label_Construct => Block));
3917 Append_To (Actions, Block);
3919 Set_Activation_Chain_Entity (Block, Chain);
3920 end Build_Task_Allocate_Block;
3922 -----------------------------------------------
3923 -- Build_Task_Allocate_Block_With_Init_Stmts --
3924 -----------------------------------------------
3926 procedure Build_Task_Allocate_Block_With_Init_Stmts
3929 Init_Stmts : List_Id)
3931 Loc : constant Source_Ptr := Sloc (N);
3932 Chain : constant Entity_Id :=
3933 Make_Defining_Identifier (Loc, Name_uChain);
3938 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
3940 Append_To (Init_Stmts,
3941 Make_Procedure_Call_Statement (Loc,
3942 Name => New_Reference_To (RTE (RE_Activate_Tasks), Loc),
3943 Parameter_Associations => New_List (
3944 Make_Attribute_Reference (Loc,
3945 Prefix => New_Reference_To (Chain, Loc),
3946 Attribute_Name => Name_Unchecked_Access))));
3949 Make_Block_Statement (Loc,
3950 Identifier => New_Reference_To (Blkent, Loc),
3951 Declarations => New_List (
3953 -- _Chain : Activation_Chain;
3955 Make_Object_Declaration (Loc,
3956 Defining_Identifier => Chain,
3957 Aliased_Present => True,
3958 Object_Definition =>
3959 New_Reference_To (RTE (RE_Activation_Chain), Loc))),
3961 Handled_Statement_Sequence =>
3962 Make_Handled_Sequence_Of_Statements (Loc, Init_Stmts),
3964 Has_Created_Identifier => True,
3965 Is_Task_Allocation_Block => True);
3968 Make_Implicit_Label_Declaration (Loc,
3969 Defining_Identifier => Blkent,
3970 Label_Construct => Block));
3972 Append_To (Actions, Block);
3974 Set_Activation_Chain_Entity (Block, Chain);
3975 end Build_Task_Allocate_Block_With_Init_Stmts;
3977 -----------------------------------
3978 -- Build_Task_Proc_Specification --
3979 -----------------------------------
3981 function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id is
3982 Loc : constant Source_Ptr := Sloc (T);
3983 Spec_Id : Entity_Id;
3987 Make_Defining_Identifier (Loc,
3988 Chars => New_External_Name (Chars (T), 'B'));
3989 Set_Is_Internal (Spec_Id);
3991 -- Associate the procedure with the task, if this is the declaration
3992 -- (and not the body) of the procedure.
3994 if No (Task_Body_Procedure (T)) then
3995 Set_Task_Body_Procedure (T, Spec_Id);
3999 Make_Procedure_Specification (Loc,
4000 Defining_Unit_Name => Spec_Id,
4001 Parameter_Specifications => New_List (
4002 Make_Parameter_Specification (Loc,
4003 Defining_Identifier =>
4004 Make_Defining_Identifier (Loc, Name_uTask),
4006 Make_Access_Definition (Loc,
4008 New_Reference_To (Corresponding_Record_Type (T), Loc)))));
4009 end Build_Task_Proc_Specification;
4011 ---------------------------------------
4012 -- Build_Unprotected_Subprogram_Body --
4013 ---------------------------------------
4015 function Build_Unprotected_Subprogram_Body
4017 Pid : Node_Id) return Node_Id
4019 Decls : constant List_Id := Declarations (N);
4022 -- Add renamings for the Protection object, discriminals, privals and
4023 -- the entry index constant for use by debugger.
4025 Debug_Private_Data_Declarations (Decls);
4027 -- Make an unprotected version of the subprogram for use within the same
4028 -- object, with a new name and an additional parameter representing the
4032 Make_Subprogram_Body (Sloc (N),
4034 Build_Protected_Sub_Specification (N, Pid, Unprotected_Mode),
4035 Declarations => Decls,
4036 Handled_Statement_Sequence => Handled_Statement_Sequence (N));
4037 end Build_Unprotected_Subprogram_Body;
4039 ----------------------------
4040 -- Collect_Entry_Families --
4041 ----------------------------
4043 procedure Collect_Entry_Families
4046 Current_Node : in out Node_Id;
4047 Conctyp : Entity_Id)
4050 Efam_Decl : Node_Id;
4051 Efam_Type : Entity_Id;
4054 Efam := First_Entity (Conctyp);
4055 while Present (Efam) loop
4056 if Ekind (Efam) = E_Entry_Family then
4058 Make_Defining_Identifier (Loc,
4059 Chars => New_Internal_Name ('F'));
4064 (Etype (Discrete_Subtype_Definition (Parent (Efam))));
4066 Bas_Decl : Node_Id := Empty;
4071 (Discrete_Subtype_Definition (Parent (Efam)), Lo, Hi);
4073 if Is_Potentially_Large_Family (Bas, Conctyp, Lo, Hi) then
4075 Make_Defining_Identifier (Loc,
4076 Chars => New_Internal_Name ('B'));
4079 Make_Subtype_Declaration (Loc,
4080 Defining_Identifier => Bas,
4081 Subtype_Indication =>
4082 Make_Subtype_Indication (Loc,
4084 New_Occurrence_Of (Standard_Integer, Loc),
4086 Make_Range_Constraint (Loc,
4087 Range_Expression => Make_Range (Loc,
4088 Make_Integer_Literal
4089 (Loc, -Entry_Family_Bound),
4090 Make_Integer_Literal
4091 (Loc, Entry_Family_Bound - 1)))));
4093 Insert_After (Current_Node, Bas_Decl);
4094 Current_Node := Bas_Decl;
4099 Make_Full_Type_Declaration (Loc,
4100 Defining_Identifier => Efam_Type,
4102 Make_Unconstrained_Array_Definition (Loc,
4104 (New_List (New_Occurrence_Of (Bas, Loc))),
4106 Component_Definition =>
4107 Make_Component_Definition (Loc,
4108 Aliased_Present => False,
4109 Subtype_Indication =>
4110 New_Reference_To (Standard_Character, Loc))));
4113 Insert_After (Current_Node, Efam_Decl);
4114 Current_Node := Efam_Decl;
4115 Analyze (Efam_Decl);
4118 Make_Component_Declaration (Loc,
4119 Defining_Identifier =>
4120 Make_Defining_Identifier (Loc, Chars (Efam)),
4122 Component_Definition =>
4123 Make_Component_Definition (Loc,
4124 Aliased_Present => False,
4125 Subtype_Indication =>
4126 Make_Subtype_Indication (Loc,
4128 New_Occurrence_Of (Efam_Type, Loc),
4131 Make_Index_Or_Discriminant_Constraint (Loc,
4132 Constraints => New_List (
4134 (Etype (Discrete_Subtype_Definition
4135 (Parent (Efam))), Loc)))))));
4141 end Collect_Entry_Families;
4143 -----------------------
4144 -- Concurrent_Object --
4145 -----------------------
4147 function Concurrent_Object
4148 (Spec_Id : Entity_Id;
4149 Conc_Typ : Entity_Id) return Entity_Id
4152 -- Parameter _O or _object
4154 if Is_Protected_Type (Conc_Typ) then
4155 return First_Formal (Protected_Body_Subprogram (Spec_Id));
4160 pragma Assert (Is_Task_Type (Conc_Typ));
4161 return First_Formal (Task_Body_Procedure (Conc_Typ));
4163 end Concurrent_Object;
4165 ----------------------
4166 -- Copy_Result_Type --
4167 ----------------------
4169 function Copy_Result_Type (Res : Node_Id) return Node_Id is
4170 New_Res : constant Node_Id := New_Copy_Tree (Res);
4175 -- If the result type is an access_to_subprogram, we must create
4176 -- new entities for its spec.
4178 if Nkind (New_Res) = N_Access_Definition
4179 and then Present (Access_To_Subprogram_Definition (New_Res))
4181 -- Provide new entities for the formals
4183 Par_Spec := First (Parameter_Specifications
4184 (Access_To_Subprogram_Definition (New_Res)));
4185 while Present (Par_Spec) loop
4186 Formal := Defining_Identifier (Par_Spec);
4187 Set_Defining_Identifier (Par_Spec,
4188 Make_Defining_Identifier (Sloc (Formal), Chars (Formal)));
4194 end Copy_Result_Type;
4196 --------------------
4197 -- Concurrent_Ref --
4198 --------------------
4200 -- The expression returned for a reference to a concurrent object has the
4203 -- taskV!(name)._Task_Id
4207 -- objectV!(name)._Object
4209 -- for a protected object. For the case of an access to a concurrent
4210 -- object, there is an extra explicit dereference:
4212 -- taskV!(name.all)._Task_Id
4213 -- objectV!(name.all)._Object
4215 -- here taskV and objectV are the types for the associated records, which
4216 -- contain the required _Task_Id and _Object fields for tasks and protected
4217 -- objects, respectively.
4219 -- For the case of a task type name, the expression is
4223 -- i.e. a call to the Self function which returns precisely this Task_Id
4225 -- For the case of a protected type name, the expression is
4229 -- which is a renaming of the _object field of the current object
4230 -- record, passed into protected operations as a parameter.
4232 function Concurrent_Ref (N : Node_Id) return Node_Id is
4233 Loc : constant Source_Ptr := Sloc (N);
4234 Ntyp : constant Entity_Id := Etype (N);
4238 function Is_Current_Task (T : Entity_Id) return Boolean;
4239 -- Check whether the reference is to the immediately enclosing task
4240 -- type, or to an outer one (rare but legal).
4242 ---------------------
4243 -- Is_Current_Task --
4244 ---------------------
4246 function Is_Current_Task (T : Entity_Id) return Boolean is
4250 Scop := Current_Scope;
4251 while Present (Scop)
4252 and then Scop /= Standard_Standard
4258 elsif Is_Task_Type (Scop) then
4261 -- If this is a procedure nested within the task type, we must
4262 -- assume that it can be called from an inner task, and therefore
4263 -- cannot treat it as a local reference.
4265 elsif Is_Overloadable (Scop)
4266 and then In_Open_Scopes (T)
4271 Scop := Scope (Scop);
4275 -- We know that we are within the task body, so should have found it
4278 raise Program_Error;
4279 end Is_Current_Task;
4281 -- Start of processing for Concurrent_Ref
4284 if Is_Access_Type (Ntyp) then
4285 Dtyp := Designated_Type (Ntyp);
4287 if Is_Protected_Type (Dtyp) then
4288 Sel := Name_uObject;
4290 Sel := Name_uTask_Id;
4294 Make_Selected_Component (Loc,
4296 Unchecked_Convert_To (Corresponding_Record_Type (Dtyp),
4297 Make_Explicit_Dereference (Loc, N)),
4298 Selector_Name => Make_Identifier (Loc, Sel));
4300 elsif Is_Entity_Name (N)
4301 and then Is_Concurrent_Type (Entity (N))
4303 if Is_Task_Type (Entity (N)) then
4305 if Is_Current_Task (Entity (N)) then
4307 Make_Function_Call (Loc,
4308 Name => New_Reference_To (RTE (RE_Self), Loc));
4313 T_Self : constant Entity_Id :=
4314 Make_Defining_Identifier (Loc,
4315 Chars => New_Internal_Name ('T'));
4316 T_Body : constant Node_Id :=
4317 Parent (Corresponding_Body (Parent (Entity (N))));
4320 Decl := Make_Object_Declaration (Loc,
4321 Defining_Identifier => T_Self,
4322 Object_Definition =>
4323 New_Occurrence_Of (RTE (RO_ST_Task_Id), Loc),
4325 Make_Function_Call (Loc,
4326 Name => New_Reference_To (RTE (RE_Self), Loc)));
4327 Prepend (Decl, Declarations (T_Body));
4329 Set_Scope (T_Self, Entity (N));
4330 return New_Occurrence_Of (T_Self, Loc);
4335 pragma Assert (Is_Protected_Type (Entity (N)));
4338 New_Reference_To (Find_Protection_Object (Current_Scope), Loc);
4342 if Is_Protected_Type (Ntyp) then
4343 Sel := Name_uObject;
4345 elsif Is_Task_Type (Ntyp) then
4346 Sel := Name_uTask_Id;
4349 raise Program_Error;
4353 Make_Selected_Component (Loc,
4355 Unchecked_Convert_To (Corresponding_Record_Type (Ntyp),
4357 Selector_Name => Make_Identifier (Loc, Sel));
4361 ------------------------
4362 -- Convert_Concurrent --
4363 ------------------------
4365 function Convert_Concurrent
4367 Typ : Entity_Id) return Node_Id
4370 if not Is_Concurrent_Type (Typ) then
4374 Unchecked_Convert_To
4375 (Corresponding_Record_Type (Typ), New_Copy_Tree (N));
4377 end Convert_Concurrent;
4379 -------------------------------------
4380 -- Debug_Private_Data_Declarations --
4381 -------------------------------------
4383 procedure Debug_Private_Data_Declarations (Decls : List_Id) is
4384 Debug_Nod : Node_Id;
4388 Decl := First (Decls);
4389 while Present (Decl)
4390 and then not Comes_From_Source (Decl)
4392 -- Declaration for concurrent entity _object and its access type,
4393 -- along with the entry index subtype:
4394 -- type prot_typVP is access prot_typV;
4395 -- _object : prot_typVP := prot_typV (_O);
4396 -- subtype Jnn is <Type of Index> range Low .. High;
4398 if Nkind_In (Decl, N_Full_Type_Declaration, N_Object_Declaration) then
4399 Set_Debug_Info_Needed (Defining_Identifier (Decl));
4401 -- Declaration for the Protection object, discriminals, privals and
4402 -- entry index constant:
4403 -- conc_typR : protection_typ renames _object._object;
4404 -- discr_nameD : discr_typ renames _object.discr_name;
4405 -- discr_nameD : discr_typ renames _task.discr_name;
4406 -- prival_name : comp_typ renames _object.comp_name;
4407 -- J : constant Jnn :=
4408 -- Jnn'Val (_E - <Index expression> + Jnn'Pos (Jnn'First));
4410 elsif Nkind (Decl) = N_Object_Renaming_Declaration then
4411 Set_Debug_Info_Needed (Defining_Identifier (Decl));
4412 Debug_Nod := Debug_Renaming_Declaration (Decl);
4414 if Present (Debug_Nod) then
4415 Insert_After (Decl, Debug_Nod);
4421 end Debug_Private_Data_Declarations;
4423 ----------------------------
4424 -- Entry_Index_Expression --
4425 ----------------------------
4427 function Entry_Index_Expression
4431 Ttyp : Entity_Id) return Node_Id
4441 -- The queues of entries and entry families appear in textual order in
4442 -- the associated record. The entry index is computed as the sum of the
4443 -- number of queues for all entries that precede the designated one, to
4444 -- which is added the index expression, if this expression denotes a
4445 -- member of a family.
4447 -- The following is a place holder for the count of simple entries
4449 Num := Make_Integer_Literal (Sloc, 1);
4451 -- We construct an expression which is a series of addition operations.
4452 -- The first operand is the number of single entries that precede this
4453 -- one, the second operand is the index value relative to the start of
4454 -- the referenced family, and the remaining operands are the lengths of
4455 -- the entry families that precede this entry, i.e. the constructed
4458 -- number_simple_entries +
4459 -- (s'pos (index-value) - s'pos (family'first)) + 1 +
4460 -- family'length + ...
4462 -- where index-value is the given index value, and s is the index
4463 -- subtype (we have to use pos because the subtype might be an
4464 -- enumeration type preventing direct subtraction). Note that the task
4465 -- entry array is one-indexed.
4467 -- The upper bound of the entry family may be a discriminant, so we
4468 -- retrieve the lower bound explicitly to compute offset, rather than
4469 -- using the index subtype which may mention a discriminant.
4471 if Present (Index) then
4472 S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
4481 Make_Attribute_Reference (Sloc,
4482 Attribute_Name => Name_Pos,
4483 Prefix => New_Reference_To (Base_Type (S), Sloc),
4484 Expressions => New_List (Relocate_Node (Index))),
4492 -- Now add lengths of preceding entries and entry families
4494 Prev := First_Entity (Ttyp);
4496 while Chars (Prev) /= Chars (Ent)
4497 or else (Ekind (Prev) /= Ekind (Ent))
4498 or else not Sem_Ch6.Type_Conformant (Ent, Prev)
4500 if Ekind (Prev) = E_Entry then
4501 Set_Intval (Num, Intval (Num) + 1);
4503 elsif Ekind (Prev) = E_Entry_Family then
4505 Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
4506 Lo := Type_Low_Bound (S);
4507 Hi := Type_High_Bound (S);
4512 Right_Opnd => Family_Size (Sloc, Hi, Lo, Ttyp, False));
4514 -- Other components are anonymous types to be ignored
4524 end Entry_Index_Expression;
4526 ---------------------------
4527 -- Establish_Task_Master --
4528 ---------------------------
4530 procedure Establish_Task_Master (N : Node_Id) is
4533 if Restriction_Active (No_Task_Hierarchy) = False then
4534 Call := Build_Runtime_Call (Sloc (N), RE_Enter_Master);
4535 Prepend_To (Declarations (N), Call);
4538 end Establish_Task_Master;
4540 --------------------------------
4541 -- Expand_Accept_Declarations --
4542 --------------------------------
4544 -- Part of the expansion of an accept statement involves the creation of
4545 -- a declaration that can be referenced from the statement sequence of
4550 -- This declaration is inserted immediately before the accept statement
4551 -- and it is important that it be inserted before the statements of the
4552 -- statement sequence are analyzed. Thus it would be too late to create
4553 -- this declaration in the Expand_N_Accept_Statement routine, which is
4554 -- why there is a separate procedure to be called directly from Sem_Ch9.
4556 -- Ann is used to hold the address of the record containing the parameters
4557 -- (see Expand_N_Entry_Call for more details on how this record is built).
4558 -- References to the parameters do an unchecked conversion of this address
4559 -- to a pointer to the required record type, and then access the field that
4560 -- holds the value of the required parameter. The entity for the address
4561 -- variable is held as the top stack element (i.e. the last element) of the
4562 -- Accept_Address stack in the corresponding entry entity, and this element
4563 -- must be set in place before the statements are processed.
4565 -- The above description applies to the case of a stand alone accept
4566 -- statement, i.e. one not appearing as part of a select alternative.
4568 -- For the case of an accept that appears as part of a select alternative
4569 -- of a selective accept, we must still create the declaration right away,
4570 -- since Ann is needed immediately, but there is an important difference:
4572 -- The declaration is inserted before the selective accept, not before
4573 -- the accept statement (which is not part of a list anyway, and so would
4574 -- not accommodate inserted declarations)
4576 -- We only need one address variable for the entire selective accept. So
4577 -- the Ann declaration is created only for the first accept alternative,
4578 -- and subsequent accept alternatives reference the same Ann variable.
4580 -- We can distinguish the two cases by seeing whether the accept statement
4581 -- is part of a list. If not, then it must be in an accept alternative.
4583 -- To expand the requeue statement, a label is provided at the end of the
4584 -- accept statement or alternative of which it is a part, so that the
4585 -- statement can be skipped after the requeue is complete. This label is
4586 -- created here rather than during the expansion of the accept statement,
4587 -- because it will be needed by any requeue statements within the accept,
4588 -- which are expanded before the accept.
4590 procedure Expand_Accept_Declarations (N : Node_Id; Ent : Entity_Id) is
4591 Loc : constant Source_Ptr := Sloc (N);
4592 Stats : constant Node_Id := Handled_Statement_Sequence (N);
4593 Ann : Entity_Id := Empty;
4601 if Expander_Active then
4603 -- If we have no handled statement sequence, we may need to build
4604 -- a dummy sequence consisting of a null statement. This can be
4605 -- skipped if the trivial accept optimization is permitted.
4607 if not Trivial_Accept_OK
4609 (No (Stats) or else Null_Statements (Statements (Stats)))
4611 Set_Handled_Statement_Sequence (N,
4612 Make_Handled_Sequence_Of_Statements (Loc,
4613 New_List (Make_Null_Statement (Loc))));
4616 -- Create and declare two labels to be placed at the end of the
4617 -- accept statement. The first label is used to allow requeues to
4618 -- skip the remainder of entry processing. The second label is used
4619 -- to skip the remainder of entry processing if the rendezvous
4620 -- completes in the middle of the accept body.
4622 if Present (Handled_Statement_Sequence (N)) then
4623 Lab_Id := Make_Identifier (Loc, New_Internal_Name ('L'));
4625 Make_Defining_Identifier (Loc, Chars (Lab_Id)));
4626 Lab := Make_Label (Loc, Lab_Id);
4628 Make_Implicit_Label_Declaration (Loc,
4629 Defining_Identifier => Entity (Lab_Id),
4630 Label_Construct => Lab);
4631 Append (Lab, Statements (Handled_Statement_Sequence (N)));
4633 Lab_Id := Make_Identifier (Loc, New_Internal_Name ('L'));
4635 Make_Defining_Identifier (Loc, Chars (Lab_Id)));
4636 Lab := Make_Label (Loc, Lab_Id);
4638 Make_Implicit_Label_Declaration (Loc,
4639 Defining_Identifier => Entity (Lab_Id),
4640 Label_Construct => Lab);
4641 Append (Lab, Statements (Handled_Statement_Sequence (N)));
4648 -- Case of stand alone accept statement
4650 if Is_List_Member (N) then
4652 if Present (Handled_Statement_Sequence (N)) then
4654 Make_Defining_Identifier (Loc,
4655 Chars => New_Internal_Name ('A'));
4658 Make_Object_Declaration (Loc,
4659 Defining_Identifier => Ann,
4660 Object_Definition =>
4661 New_Reference_To (RTE (RE_Address), Loc));
4663 Insert_Before (N, Adecl);
4666 Insert_Before (N, Ldecl);
4669 Insert_Before (N, Ldecl2);
4673 -- Case of accept statement which is in an accept alternative
4677 Acc_Alt : constant Node_Id := Parent (N);
4678 Sel_Acc : constant Node_Id := Parent (Acc_Alt);
4682 pragma Assert (Nkind (Acc_Alt) = N_Accept_Alternative);
4683 pragma Assert (Nkind (Sel_Acc) = N_Selective_Accept);
4685 -- ??? Consider a single label for select statements
4687 if Present (Handled_Statement_Sequence (N)) then
4689 Statements (Handled_Statement_Sequence (N)));
4693 Statements (Handled_Statement_Sequence (N)));
4697 -- Find first accept alternative of the selective accept. A
4698 -- valid selective accept must have at least one accept in it.
4700 Alt := First (Select_Alternatives (Sel_Acc));
4702 while Nkind (Alt) /= N_Accept_Alternative loop
4706 -- If we are the first accept statement, then we have to create
4707 -- the Ann variable, as for the stand alone case, except that
4708 -- it is inserted before the selective accept. Similarly, a
4709 -- label for requeue expansion must be declared.
4711 if N = Accept_Statement (Alt) then
4713 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
4716 Make_Object_Declaration (Loc,
4717 Defining_Identifier => Ann,
4718 Object_Definition =>
4719 New_Reference_To (RTE (RE_Address), Loc));
4721 Insert_Before (Sel_Acc, Adecl);
4724 -- If we are not the first accept statement, then find the Ann
4725 -- variable allocated by the first accept and use it.
4729 Node (Last_Elmt (Accept_Address
4730 (Entity (Entry_Direct_Name (Accept_Statement (Alt))))));
4735 -- Merge here with Ann either created or referenced, and Adecl
4736 -- pointing to the corresponding declaration. Remaining processing
4737 -- is the same for the two cases.
4739 if Present (Ann) then
4740 Append_Elmt (Ann, Accept_Address (Ent));
4741 Set_Debug_Info_Needed (Ann);
4744 -- Create renaming declarations for the entry formals. Each reference
4745 -- to a formal becomes a dereference of a component of the parameter
4746 -- block, whose address is held in Ann. These declarations are
4747 -- eventually inserted into the accept block, and analyzed there so
4748 -- that they have the proper scope for gdb and do not conflict with
4749 -- other declarations.
4751 if Present (Parameter_Specifications (N))
4752 and then Present (Handled_Statement_Sequence (N))
4762 Formal := First_Formal (Ent);
4764 while Present (Formal) loop
4765 Comp := Entry_Component (Formal);
4767 Make_Defining_Identifier (Loc, Chars (Formal));
4769 Set_Etype (New_F, Etype (Formal));
4770 Set_Scope (New_F, Ent);
4772 -- Now we set debug info needed on New_F even though it does
4773 -- not come from source, so that the debugger will get the
4774 -- right information for these generated names.
4776 Set_Debug_Info_Needed (New_F);
4778 if Ekind (Formal) = E_In_Parameter then
4779 Set_Ekind (New_F, E_Constant);
4781 Set_Ekind (New_F, E_Variable);
4782 Set_Extra_Constrained (New_F, Extra_Constrained (Formal));
4785 Set_Actual_Subtype (New_F, Actual_Subtype (Formal));
4788 Make_Object_Renaming_Declaration (Loc,
4789 Defining_Identifier =>
4792 New_Reference_To (Etype (Formal), Loc),
4794 Make_Explicit_Dereference (Loc,
4795 Make_Selected_Component (Loc,
4797 Unchecked_Convert_To (
4798 Entry_Parameters_Type (Ent),
4799 New_Reference_To (Ann, Loc)),
4801 New_Reference_To (Comp, Loc))));
4803 if No (Declarations (N)) then
4804 Set_Declarations (N, New_List);
4807 Append (Decl, Declarations (N));
4808 Set_Renamed_Object (Formal, New_F);
4809 Next_Formal (Formal);
4816 end Expand_Accept_Declarations;
4818 ---------------------------------------------
4819 -- Expand_Access_Protected_Subprogram_Type --
4820 ---------------------------------------------
4822 procedure Expand_Access_Protected_Subprogram_Type (N : Node_Id) is
4823 Loc : constant Source_Ptr := Sloc (N);
4825 T : constant Entity_Id := Defining_Identifier (N);
4826 D_T : constant Entity_Id := Designated_Type (T);
4827 D_T2 : constant Entity_Id := Make_Defining_Identifier (Loc,
4828 Chars => New_Internal_Name ('D'));
4829 E_T : constant Entity_Id := Make_Defining_Identifier (Loc,
4830 Chars => New_Internal_Name ('E'));
4831 P_List : constant List_Id := Build_Protected_Spec
4832 (N, RTE (RE_Address), D_T, False);
4838 -- Create access to subprogram with full signature
4840 if Etype (D_T) /= Standard_Void_Type then
4842 Make_Access_Function_Definition (Loc,
4843 Parameter_Specifications => P_List,
4844 Result_Definition =>
4845 Copy_Result_Type (Result_Definition (Type_Definition (N))));
4849 Make_Access_Procedure_Definition (Loc,
4850 Parameter_Specifications => P_List);
4854 Make_Full_Type_Declaration (Loc,
4855 Defining_Identifier => D_T2,
4856 Type_Definition => Def1);
4858 Insert_After (N, Decl1);
4861 -- Create Equivalent_Type, a record with two components for an access to
4862 -- object and an access to subprogram.
4865 Make_Component_Declaration (Loc,
4866 Defining_Identifier =>
4867 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
4868 Component_Definition =>
4869 Make_Component_Definition (Loc,
4870 Aliased_Present => False,
4871 Subtype_Indication =>
4872 New_Occurrence_Of (RTE (RE_Address), Loc))),
4874 Make_Component_Declaration (Loc,
4875 Defining_Identifier =>
4876 Make_Defining_Identifier (Loc, New_Internal_Name ('S')),
4877 Component_Definition =>
4878 Make_Component_Definition (Loc,
4879 Aliased_Present => False,
4880 Subtype_Indication => New_Occurrence_Of (D_T2, Loc))));
4883 Make_Full_Type_Declaration (Loc,
4884 Defining_Identifier => E_T,
4886 Make_Record_Definition (Loc,
4888 Make_Component_List (Loc,
4889 Component_Items => Comps)));
4891 Insert_After (Decl1, Decl2);
4893 Set_Equivalent_Type (T, E_T);
4894 end Expand_Access_Protected_Subprogram_Type;
4896 --------------------------
4897 -- Expand_Entry_Barrier --
4898 --------------------------
4900 procedure Expand_Entry_Barrier (N : Node_Id; Ent : Entity_Id) is
4901 Cond : constant Node_Id :=
4902 Condition (Entry_Body_Formal_Part (N));
4903 Prot : constant Entity_Id := Scope (Ent);
4904 Spec_Decl : constant Node_Id := Parent (Prot);
4907 Body_Decl : Node_Id;
4910 if No_Run_Time_Mode then
4911 Error_Msg_CRT ("entry barrier", N);
4915 -- The body of the entry barrier must be analyzed in the context of the
4916 -- protected object, but its scope is external to it, just as any other
4917 -- unprotected version of a protected operation. The specification has
4918 -- been produced when the protected type declaration was elaborated. We
4919 -- build the body, insert it in the enclosing scope, but analyze it in
4920 -- the current context. A more uniform approach would be to treat the
4921 -- barrier just as a protected function, and discard the protected
4922 -- version of it because it is never called.
4924 if Expander_Active then
4925 B_F := Build_Barrier_Function (N, Ent, Prot);
4926 Func := Barrier_Function (Ent);
4927 Set_Corresponding_Spec (B_F, Func);
4929 Body_Decl := Parent (Corresponding_Body (Spec_Decl));
4931 if Nkind (Parent (Body_Decl)) = N_Subunit then
4932 Body_Decl := Corresponding_Stub (Parent (Body_Decl));
4935 Insert_Before_And_Analyze (Body_Decl, B_F);
4937 Set_Discriminals (Spec_Decl);
4938 Set_Scope (Func, Scope (Prot));
4941 Analyze_And_Resolve (Cond, Any_Boolean);
4944 -- The Ravenscar profile restricts barriers to simple variables declared
4945 -- within the protected object. We also allow Boolean constants, since
4946 -- these appear in several published examples and are also allowed by
4947 -- the Aonix compiler.
4949 -- Note that after analysis variables in this context will be replaced
4950 -- by the corresponding prival, that is to say a renaming of a selected
4951 -- component of the form _Object.Var. If expansion is disabled, as
4952 -- within a generic, we check that the entity appears in the current
4955 if Is_Entity_Name (Cond) then
4957 -- A small optimization of useless renamings. If the scope of the
4958 -- entity of the condition is not the barrier function, then the
4959 -- condition does not reference any of the generated renamings
4960 -- within the function.
4963 and then Scope (Entity (Cond)) /= Func
4965 Set_Declarations (B_F, Empty_List);
4968 if Entity (Cond) = Standard_False
4970 Entity (Cond) = Standard_True
4974 elsif not Expander_Active
4975 and then Scope (Entity (Cond)) = Current_Scope
4979 -- Check for case of _object.all.field (note that the explicit
4980 -- dereference gets inserted by analyze/expand of _object.field)
4982 elsif Present (Renamed_Object (Entity (Cond)))
4984 Nkind (Renamed_Object (Entity (Cond))) = N_Selected_Component
4988 (Prefix (Renamed_Object (Entity (Cond))))) = Name_uObject
4994 -- It is not a boolean variable or literal, so check the restriction
4996 Check_Restriction (Simple_Barriers, Cond);
4997 end Expand_Entry_Barrier;
4999 ------------------------------
5000 -- Expand_N_Abort_Statement --
5001 ------------------------------
5003 -- Expand abort T1, T2, .. Tn; into:
5004 -- Abort_Tasks (Task_List'(1 => T1.Task_Id, 2 => T2.Task_Id ...))
5006 procedure Expand_N_Abort_Statement (N : Node_Id) is
5007 Loc : constant Source_Ptr := Sloc (N);
5008 Tlist : constant List_Id := Names (N);
5014 Aggr := Make_Aggregate (Loc, Component_Associations => New_List);
5017 Tasknm := First (Tlist);
5019 while Present (Tasknm) loop
5022 -- A task interface class-wide type object is being aborted.
5023 -- Retrieve its _task_id by calling a dispatching routine.
5025 if Ada_Version >= Ada_05
5026 and then Ekind (Etype (Tasknm)) = E_Class_Wide_Type
5027 and then Is_Interface (Etype (Tasknm))
5028 and then Is_Task_Interface (Etype (Tasknm))
5030 Append_To (Component_Associations (Aggr),
5031 Make_Component_Association (Loc,
5032 Choices => New_List (
5033 Make_Integer_Literal (Loc, Count)),
5036 -- Task_Id (Tasknm._disp_get_task_id)
5038 Make_Unchecked_Type_Conversion (Loc,
5040 New_Reference_To (RTE (RO_ST_Task_Id), Loc),
5042 Make_Selected_Component (Loc,
5044 New_Copy_Tree (Tasknm),
5046 Make_Identifier (Loc, Name_uDisp_Get_Task_Id)))));
5049 Append_To (Component_Associations (Aggr),
5050 Make_Component_Association (Loc,
5051 Choices => New_List (
5052 Make_Integer_Literal (Loc, Count)),
5053 Expression => Concurrent_Ref (Tasknm)));
5060 Make_Procedure_Call_Statement (Loc,
5061 Name => New_Reference_To (RTE (RE_Abort_Tasks), Loc),
5062 Parameter_Associations => New_List (
5063 Make_Qualified_Expression (Loc,
5064 Subtype_Mark => New_Reference_To (RTE (RE_Task_List), Loc),
5065 Expression => Aggr))));
5068 end Expand_N_Abort_Statement;
5070 -------------------------------
5071 -- Expand_N_Accept_Statement --
5072 -------------------------------
5074 -- This procedure handles expansion of accept statements that stand
5075 -- alone, i.e. they are not part of an accept alternative. The expansion
5076 -- of accept statement in accept alternatives is handled by the routines
5077 -- Expand_N_Accept_Alternative and Expand_N_Selective_Accept. The
5078 -- following description applies only to stand alone accept statements.
5080 -- If there is no handled statement sequence, or only null statements,
5081 -- then this is called a trivial accept, and the expansion is:
5083 -- Accept_Trivial (entry-index)
5085 -- If there is a handled statement sequence, then the expansion is:
5092 -- Accept_Call (entry-index, Ann);
5093 -- Renaming_Declarations for formals
5094 -- <statement sequence from N_Accept_Statement node>
5095 -- Complete_Rendezvous;
5100 -- <exception handler from N_Accept_Statement node>
5101 -- Complete_Rendezvous;
5103 -- <exception handler from N_Accept_Statement node>
5104 -- Complete_Rendezvous;
5109 -- when all others =>
5110 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
5113 -- The first three declarations were already inserted ahead of the accept
5114 -- statement by the Expand_Accept_Declarations procedure, which was called
5115 -- directly from the semantics during analysis of the accept statement,
5116 -- before analyzing its contained statements.
5118 -- The declarations from the N_Accept_Statement, as noted in Sinfo, come
5119 -- from possible expansion activity (the original source of course does
5120 -- not have any declarations associated with the accept statement, since
5121 -- an accept statement has no declarative part). In particular, if the
5122 -- expander is active, the first such declaration is the declaration of
5123 -- the Accept_Params_Ptr entity (see Sem_Ch9.Analyze_Accept_Statement).
5125 -- The two blocks are merged into a single block if the inner block has
5126 -- no exception handlers, but otherwise two blocks are required, since
5127 -- exceptions might be raised in the exception handlers of the inner
5128 -- block, and Exceptional_Complete_Rendezvous must be called.
5130 procedure Expand_N_Accept_Statement (N : Node_Id) is
5131 Loc : constant Source_Ptr := Sloc (N);
5132 Stats : constant Node_Id := Handled_Statement_Sequence (N);
5133 Ename : constant Node_Id := Entry_Direct_Name (N);
5134 Eindx : constant Node_Id := Entry_Index (N);
5135 Eent : constant Entity_Id := Entity (Ename);
5136 Acstack : constant Elist_Id := Accept_Address (Eent);
5137 Ann : constant Entity_Id := Node (Last_Elmt (Acstack));
5138 Ttyp : constant Entity_Id := Etype (Scope (Eent));
5143 -- Start of processing for Expand_N_Accept_Statement
5146 -- If accept statement is not part of a list, then its parent must be
5147 -- an accept alternative, and, as described above, we do not do any
5148 -- expansion for such accept statements at this level.
5150 if not Is_List_Member (N) then
5151 pragma Assert (Nkind (Parent (N)) = N_Accept_Alternative);
5154 -- Trivial accept case (no statement sequence, or null statements).
5155 -- If the accept statement has declarations, then just insert them
5156 -- before the procedure call.
5158 elsif Trivial_Accept_OK
5159 and then (No (Stats) or else Null_Statements (Statements (Stats)))
5161 -- Remove declarations for renamings, because the parameter block
5162 -- will not be assigned.
5169 D := First (Declarations (N));
5171 while Present (D) loop
5173 if Nkind (D) = N_Object_Renaming_Declaration then
5181 if Present (Declarations (N)) then
5182 Insert_Actions (N, Declarations (N));
5186 Make_Procedure_Call_Statement (Loc,
5187 Name => New_Reference_To (RTE (RE_Accept_Trivial), Loc),
5188 Parameter_Associations => New_List (
5189 Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp))));
5193 -- Discard Entry_Address that was created for it, so it will not be
5194 -- emitted if this accept statement is in the statement part of a
5195 -- delay alternative.
5197 if Present (Stats) then
5198 Remove_Last_Elmt (Acstack);
5201 -- Case of statement sequence present
5204 -- Construct the block, using the declarations from the accept
5205 -- statement if any to initialize the declarations of the block.
5207 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
5208 Set_Ekind (Blkent, E_Block);
5209 Set_Etype (Blkent, Standard_Void_Type);
5210 Set_Scope (Blkent, Current_Scope);
5213 Make_Block_Statement (Loc,
5214 Identifier => New_Reference_To (Blkent, Loc),
5215 Declarations => Declarations (N),
5216 Handled_Statement_Sequence => Build_Accept_Body (N));
5218 -- Prepend call to Accept_Call to main statement sequence If the
5219 -- accept has exception handlers, the statement sequence is wrapped
5220 -- in a block. Insert call and renaming declarations in the
5221 -- declarations of the block, so they are elaborated before the
5225 Make_Procedure_Call_Statement (Loc,
5226 Name => New_Reference_To (RTE (RE_Accept_Call), Loc),
5227 Parameter_Associations => New_List (
5228 Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp),
5229 New_Reference_To (Ann, Loc)));
5231 if Parent (Stats) = N then
5232 Prepend (Call, Statements (Stats));
5241 Push_Scope (Blkent);
5249 D := First (Declarations (N));
5250 while Present (D) loop
5253 if Nkind (D) = N_Object_Renaming_Declaration then
5255 -- The renaming declarations for the formals were created
5256 -- during analysis of the accept statement, and attached to
5257 -- the list of declarations. Place them now in the context
5258 -- of the accept block or subprogram.
5261 Typ := Entity (Subtype_Mark (D));
5262 Insert_After (Call, D);
5265 -- If the formal is class_wide, it does not have an actual
5266 -- subtype. The analysis of the renaming declaration creates
5267 -- one, but we need to retain the class-wide nature of the
5270 if Is_Class_Wide_Type (Typ) then
5271 Set_Etype (Defining_Identifier (D), Typ);
5282 -- Replace the accept statement by the new block
5287 -- Last step is to unstack the Accept_Address value
5289 Remove_Last_Elmt (Acstack);
5291 end Expand_N_Accept_Statement;
5293 ----------------------------------
5294 -- Expand_N_Asynchronous_Select --
5295 ----------------------------------
5297 -- This procedure assumes that the trigger statement is an entry call or
5298 -- a dispatching procedure call. A delay alternative should already have
5299 -- been expanded into an entry call to the appropriate delay object Wait
5302 -- If the trigger is a task entry call, the select is implemented with
5303 -- a Task_Entry_Call:
5308 -- P : parms := (parm, parm, parm);
5310 -- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions
5312 -- procedure _clean is
5315 -- Cancel_Task_Entry_Call (C);
5322 -- (<acceptor-task>, -- Acceptor
5323 -- <entry-index>, -- E
5324 -- P'Address, -- Uninterpreted_Data
5325 -- Asynchronous_Call, -- Mode
5326 -- B); -- Rendezvous_Successful
5333 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
5336 -- when Abort_Signal => Abort_Undefer;
5343 -- <triggered-statements>
5347 -- Note that Build_Simple_Entry_Call is used to expand the entry of the
5348 -- asynchronous entry call (by Expand_N_Entry_Call_Statement procedure)
5352 -- P : parms := (parm, parm, parm);
5354 -- Call_Simple (acceptor-task, entry-index, P'Address);
5360 -- so the task at hand is to convert the latter expansion into the former
5362 -- If the trigger is a protected entry call, the select is implemented
5363 -- with Protected_Entry_Call:
5366 -- P : E1_Params := (param, param, param);
5367 -- Bnn : Communications_Block;
5372 -- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions
5374 -- procedure _clean is
5377 -- if Enqueued (Bnn) then
5378 -- Cancel_Protected_Entry_Call (Bnn);
5385 -- Protected_Entry_Call
5386 -- (po._object'Access, -- Object
5387 -- <entry index>, -- E
5388 -- P'Address, -- Uninterpreted_Data
5389 -- Asynchronous_Call, -- Mode
5392 -- if Enqueued (Bnn) then
5396 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
5399 -- when Abort_Signal => Abort_Undefer;
5402 -- if not Cancelled (Bnn) then
5403 -- <triggered-statements>
5407 -- Build_Simple_Entry_Call is used to expand the all to a simple protected
5411 -- P : E1_Params := (param, param, param);
5412 -- Bnn : Communications_Block;
5415 -- Protected_Entry_Call
5416 -- (po._object'Access, -- Object
5417 -- <entry index>, -- E
5418 -- P'Address, -- Uninterpreted_Data
5419 -- Simple_Call, -- Mode
5426 -- Ada 2005 (AI-345): If the trigger is a dispatching call, the select is
5430 -- B : Boolean := False;
5431 -- Bnn : Communication_Block;
5432 -- C : Ada.Tags.Prim_Op_Kind;
5433 -- D : System.Storage_Elements.Dummy_Communication_Block;
5434 -- K : Ada.Tags.Tagged_Kind :=
5435 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
5436 -- P : Parameters := (Param1 .. ParamN);
5441 -- if K = Ada.Tags.TK_Limited_Tagged then
5442 -- <dispatching-call>;
5443 -- <triggering-statements>;
5447 -- Ada.Tags.Get_Offset_Index
5448 -- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
5450 -- _Disp_Get_Prim_Op_Kind (<object>, S, C);
5452 -- if C = POK_Protected_Entry then
5454 -- procedure _clean is
5456 -- if Enqueued (Bnn) then
5457 -- Cancel_Protected_Entry_Call (Bnn);
5463 -- _Disp_Asynchronous_Select
5464 -- (<object>, S, P'Address, D, B);
5465 -- Bnn := Communication_Block (D);
5467 -- Param1 := P.Param1;
5469 -- ParamN := P.ParamN;
5471 -- if Enqueued (Bnn) then
5472 -- <abortable-statements>
5475 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
5478 -- when Abort_Signal => Abort_Undefer;
5481 -- if not Cancelled (Bnn) then
5482 -- <triggering-statements>
5485 -- elsif C = POK_Task_Entry then
5487 -- procedure _clean is
5489 -- Cancel_Task_Entry_Call (U);
5495 -- _Disp_Asynchronous_Select
5496 -- (<object>, S, P'Address, D, B);
5497 -- Bnn := Communication_Bloc (D);
5499 -- Param1 := P.Param1;
5501 -- ParamN := P.ParamN;
5506 -- <abortable-statements>
5508 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions
5511 -- when Abort_Signal => Abort_Undefer;
5515 -- <triggering-statements>
5520 -- <dispatching-call>;
5521 -- <triggering-statements>
5526 -- The job is to convert this to the asynchronous form
5528 -- If the trigger is a delay statement, it will have been expanded into a
5529 -- call to one of the GNARL delay procedures. This routine will convert
5530 -- this into a protected entry call on a delay object and then continue
5531 -- processing as for a protected entry call trigger. This requires
5532 -- declaring a Delay_Block object and adding a pointer to this object to
5533 -- the parameter list of the delay procedure to form the parameter list of
5534 -- the entry call. This object is used by the runtime to queue the delay
5537 -- For a description of the use of P and the assignments after the call,
5538 -- see Expand_N_Entry_Call_Statement.
5540 procedure Expand_N_Asynchronous_Select (N : Node_Id) is
5541 Loc : constant Source_Ptr := Sloc (N);
5542 Abrt : constant Node_Id := Abortable_Part (N);
5543 Astats : constant List_Id := Statements (Abrt);
5544 Trig : constant Node_Id := Triggering_Alternative (N);
5545 Tstats : constant List_Id := Statements (Trig);
5547 Abort_Block_Ent : Entity_Id;
5548 Abortable_Block : Node_Id;
5550 Blk_Ent : Entity_Id;
5551 Blk_Typ : Entity_Id;
5553 Call_Ent : Entity_Id;
5554 Cancel_Param : Entity_Id;
5555 Cleanup_Block : Node_Id;
5556 Cleanup_Block_Ent : Entity_Id;
5557 Cleanup_Stmts : List_Id;
5558 Conc_Typ_Stmts : List_Id;
5560 Dblock_Ent : Entity_Id;
5565 Enqueue_Call : Node_Id;
5569 Lim_Typ_Stmts : List_Id;
5575 ProtE_Stmts : List_Id;
5576 ProtP_Stmts : List_Id;
5579 Target_Undefer : RE_Id;
5580 TaskE_Stmts : List_Id;
5581 Undefer_Args : List_Id := No_List;
5583 B : Entity_Id; -- Call status flag
5584 Bnn : Entity_Id; -- Communication block
5585 C : Entity_Id; -- Call kind
5586 K : Entity_Id; -- Tagged kind
5587 P : Entity_Id; -- Parameter block
5588 S : Entity_Id; -- Primitive operation slot
5589 T : Entity_Id; -- Additional status flag
5592 Blk_Ent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
5593 Ecall := Triggering_Statement (Trig);
5595 -- The arguments in the call may require dynamic allocation, and the
5596 -- call statement may have been transformed into a block. The block
5597 -- may contain additional declarations for internal entities, and the
5598 -- original call is found by sequential search.
5600 if Nkind (Ecall) = N_Block_Statement then
5601 Ecall := First (Statements (Handled_Statement_Sequence (Ecall)));
5602 while not Nkind_In (Ecall, N_Procedure_Call_Statement,
5603 N_Entry_Call_Statement)
5609 -- This is either a dispatching call or a delay statement used as a
5610 -- trigger which was expanded into a procedure call.
5612 if Nkind (Ecall) = N_Procedure_Call_Statement then
5613 if Ada_Version >= Ada_05
5615 (No (Original_Node (Ecall))
5616 or else not Nkind_In (Original_Node (Ecall),
5617 N_Delay_Relative_Statement,
5618 N_Delay_Until_Statement))
5620 Extract_Dispatching_Call (Ecall, Call_Ent, Obj, Actuals, Formals);
5625 -- Call status flag processing, generate:
5626 -- B : Boolean := False;
5628 B := Build_B (Loc, Decls);
5630 -- Communication block processing, generate:
5631 -- Bnn : Communication_Block;
5633 Bnn := Make_Defining_Identifier (Loc, New_Internal_Name ('B'));
5636 Make_Object_Declaration (Loc,
5637 Defining_Identifier =>
5639 Object_Definition =>
5640 New_Reference_To (RTE (RE_Communication_Block), Loc)));
5642 -- Call kind processing, generate:
5643 -- C : Ada.Tags.Prim_Op_Kind;
5645 C := Build_C (Loc, Decls);
5647 -- Tagged kind processing, generate:
5648 -- K : Ada.Tags.Tagged_Kind :=
5649 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
5651 -- Dummy communication block, generate:
5652 -- D : Dummy_Communication_Block;
5655 Make_Object_Declaration (Loc,
5656 Defining_Identifier =>
5657 Make_Defining_Identifier (Loc, Name_uD),
5658 Object_Definition =>
5660 RTE (RE_Dummy_Communication_Block), Loc)));
5662 K := Build_K (Loc, Decls, Obj);
5664 -- Parameter block processing
5666 Blk_Typ := Build_Parameter_Block
5667 (Loc, Actuals, Formals, Decls);
5668 P := Parameter_Block_Pack
5669 (Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
5671 -- Dispatch table slot processing, generate:
5674 S := Build_S (Loc, Decls);
5676 -- Additional status flag processing, generate:
5678 T := Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
5681 Make_Object_Declaration (Loc,
5682 Defining_Identifier =>
5684 Object_Definition =>
5685 New_Reference_To (Standard_Boolean, Loc)));
5687 ------------------------------
5688 -- Protected entry handling --
5689 ------------------------------
5692 -- Param1 := P.Param1;
5694 -- ParamN := P.ParamN;
5696 Cleanup_Stmts := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
5699 -- Bnn := Communication_Block (D);
5701 Prepend_To (Cleanup_Stmts,
5702 Make_Assignment_Statement (Loc,
5704 New_Reference_To (Bnn, Loc),
5706 Make_Unchecked_Type_Conversion (Loc,
5708 New_Reference_To (RTE (RE_Communication_Block), Loc),
5710 Make_Identifier (Loc, Name_uD))));
5713 -- _Disp_Asynchronous_Select (<object>, S, P'Address, D, B);
5715 Prepend_To (Cleanup_Stmts,
5716 Make_Procedure_Call_Statement (Loc,
5719 Find_Prim_Op (Etype (Etype (Obj)),
5720 Name_uDisp_Asynchronous_Select),
5722 Parameter_Associations =>
5724 New_Copy_Tree (Obj), -- <object>
5725 New_Reference_To (S, Loc), -- S
5726 Make_Attribute_Reference (Loc, -- P'Address
5728 New_Reference_To (P, Loc),
5731 Make_Identifier (Loc, Name_uD), -- D
5732 New_Reference_To (B, Loc)))); -- B
5735 -- if Enqueued (Bnn) then
5736 -- <abortable-statements>
5739 Append_To (Cleanup_Stmts,
5740 Make_If_Statement (Loc,
5742 Make_Function_Call (Loc,
5744 New_Reference_To (RTE (RE_Enqueued), Loc),
5745 Parameter_Associations =>
5747 New_Reference_To (Bnn, Loc))),
5750 New_Copy_List_Tree (Astats)));
5752 -- Wrap the statements in a block. Exp_Ch7.Expand_Cleanup_Actions
5753 -- will then generate a _clean for the communication block Bnn.
5757 -- procedure _clean is
5759 -- if Enqueued (Bnn) then
5760 -- Cancel_Protected_Entry_Call (Bnn);
5769 Cleanup_Block_Ent :=
5770 Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
5773 Build_Cleanup_Block (Loc, Cleanup_Block_Ent, Cleanup_Stmts, Bnn);
5775 -- Wrap the cleanup block in an exception handling block
5781 -- when Abort_Signal => Abort_Undefer;
5785 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
5789 Make_Implicit_Label_Declaration (Loc,
5790 Defining_Identifier =>
5794 (Loc, Abort_Block_Ent, Cleanup_Block_Ent, Cleanup_Block));
5797 -- if not Cancelled (Bnn) then
5798 -- <triggering-statements>
5801 Append_To (ProtE_Stmts,
5802 Make_If_Statement (Loc,
5806 Make_Function_Call (Loc,
5808 New_Reference_To (RTE (RE_Cancelled), Loc),
5809 Parameter_Associations =>
5811 New_Reference_To (Bnn, Loc)))),
5814 New_Copy_List_Tree (Tstats)));
5816 -------------------------
5817 -- Task entry handling --
5818 -------------------------
5821 -- Param1 := P.Param1;
5823 -- ParamN := P.ParamN;
5825 TaskE_Stmts := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
5828 -- Bnn := Communication_Block (D);
5830 Append_To (TaskE_Stmts,
5831 Make_Assignment_Statement (Loc,
5833 New_Reference_To (Bnn, Loc),
5835 Make_Unchecked_Type_Conversion (Loc,
5837 New_Reference_To (RTE (RE_Communication_Block), Loc),
5839 Make_Identifier (Loc, Name_uD))));
5842 -- _Disp_Asynchronous_Select (<object>, S, P'Address, D, B);
5844 Prepend_To (TaskE_Stmts,
5845 Make_Procedure_Call_Statement (Loc,
5848 Find_Prim_Op (Etype (Etype (Obj)),
5849 Name_uDisp_Asynchronous_Select),
5851 Parameter_Associations =>
5853 New_Copy_Tree (Obj), -- <object>
5854 New_Reference_To (S, Loc), -- S
5855 Make_Attribute_Reference (Loc, -- P'Address
5857 New_Reference_To (P, Loc),
5860 Make_Identifier (Loc, Name_uD), -- D
5861 New_Reference_To (B, Loc)))); -- B
5866 Prepend_To (TaskE_Stmts,
5867 Make_Procedure_Call_Statement (Loc,
5869 New_Reference_To (RTE (RE_Abort_Defer), Loc),
5870 Parameter_Associations =>
5875 -- <abortable-statements>
5877 Cleanup_Stmts := New_Copy_List_Tree (Astats);
5879 Prepend_To (Cleanup_Stmts,
5880 Make_Procedure_Call_Statement (Loc,
5882 New_Reference_To (RTE (RE_Abort_Undefer), Loc),
5883 Parameter_Associations =>
5886 -- Wrap the statements in a block. Exp_Ch7.Expand_Cleanup_Actions
5887 -- will generate a _clean for the additional status flag.
5891 -- procedure _clean is
5893 -- Cancel_Task_Entry_Call (U);
5901 Cleanup_Block_Ent :=
5902 Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
5905 Build_Cleanup_Block (Loc, Cleanup_Block_Ent, Cleanup_Stmts, T);
5907 -- Wrap the cleanup block in an exception handling block
5913 -- when Abort_Signal => Abort_Undefer;
5917 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
5919 Append_To (TaskE_Stmts,
5920 Make_Implicit_Label_Declaration (Loc,
5921 Defining_Identifier =>
5924 Append_To (TaskE_Stmts,
5926 (Loc, Abort_Block_Ent, Cleanup_Block_Ent, Cleanup_Block));
5930 -- <triggering-statements>
5933 Append_To (TaskE_Stmts,
5934 Make_If_Statement (Loc,
5938 New_Reference_To (T, Loc)),
5941 New_Copy_List_Tree (Tstats)));
5943 ----------------------------------
5944 -- Protected procedure handling --
5945 ----------------------------------
5948 -- <dispatching-call>;
5949 -- <triggering-statements>
5951 ProtP_Stmts := New_Copy_List_Tree (Tstats);
5952 Prepend_To (ProtP_Stmts, New_Copy_Tree (Ecall));
5955 -- S := Ada.Tags.Get_Offset_Index
5956 -- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
5959 New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
5962 -- _Disp_Get_Prim_Op_Kind (<object>, S, C);
5964 Append_To (Conc_Typ_Stmts,
5965 Make_Procedure_Call_Statement (Loc,
5968 Find_Prim_Op (Etype (Etype (Obj)),
5969 Name_uDisp_Get_Prim_Op_Kind),
5971 Parameter_Associations =>
5973 New_Copy_Tree (Obj),
5974 New_Reference_To (S, Loc),
5975 New_Reference_To (C, Loc))));
5978 -- if C = POK_Procedure_Entry then
5980 -- elsif C = POK_Task_Entry then
5986 Append_To (Conc_Typ_Stmts,
5987 Make_If_Statement (Loc,
5991 New_Reference_To (C, Loc),
5993 New_Reference_To (RTE (RE_POK_Protected_Entry), Loc)),
6000 Make_Elsif_Part (Loc,
6004 New_Reference_To (C, Loc),
6006 New_Reference_To (RTE (RE_POK_Task_Entry), Loc)),
6015 -- <dispatching-call>;
6016 -- <triggering-statements>
6018 Lim_Typ_Stmts := New_Copy_List_Tree (Tstats);
6019 Prepend_To (Lim_Typ_Stmts, New_Copy_Tree (Ecall));
6022 -- if K = Ada.Tags.TK_Limited_Tagged then
6029 Make_If_Statement (Loc,
6033 New_Reference_To (K, Loc),
6035 New_Reference_To (RTE (RE_TK_Limited_Tagged), Loc)),
6044 Make_Block_Statement (Loc,
6047 Handled_Statement_Sequence =>
6048 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
6053 -- Delay triggering statement processing
6056 -- Add a Delay_Block object to the parameter list of the delay
6057 -- procedure to form the parameter list of the Wait entry call.
6060 Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
6062 Pdef := Entity (Name (Ecall));
6064 if Is_RTE (Pdef, RO_CA_Delay_For) then
6066 New_Reference_To (RTE (RE_Enqueue_Duration), Loc);
6068 elsif Is_RTE (Pdef, RO_CA_Delay_Until) then
6070 New_Reference_To (RTE (RE_Enqueue_Calendar), Loc);
6072 else pragma Assert (Is_RTE (Pdef, RO_RT_Delay_Until));
6073 Enqueue_Call := New_Reference_To (RTE (RE_Enqueue_RT), Loc);
6076 Append_To (Parameter_Associations (Ecall),
6077 Make_Attribute_Reference (Loc,
6078 Prefix => New_Reference_To (Dblock_Ent, Loc),
6079 Attribute_Name => Name_Unchecked_Access));
6081 -- Create the inner block to protect the abortable part
6084 Make_Implicit_Exception_Handler (Loc,
6085 Exception_Choices =>
6086 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
6087 Statements => New_List (
6088 Make_Procedure_Call_Statement (Loc,
6089 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)))));
6092 Make_Procedure_Call_Statement (Loc,
6093 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)));
6096 Make_Block_Statement (Loc,
6097 Identifier => New_Reference_To (Blk_Ent, Loc),
6098 Handled_Statement_Sequence =>
6099 Make_Handled_Sequence_Of_Statements (Loc,
6100 Statements => Astats),
6101 Has_Created_Identifier => True,
6102 Is_Asynchronous_Call_Block => True);
6104 -- Append call to if Enqueue (When, DB'Unchecked_Access) then
6107 Make_Implicit_If_Statement (N,
6108 Condition => Make_Function_Call (Loc,
6109 Name => Enqueue_Call,
6110 Parameter_Associations => Parameter_Associations (Ecall)),
6112 New_List (Make_Block_Statement (Loc,
6113 Handled_Statement_Sequence =>
6114 Make_Handled_Sequence_Of_Statements (Loc,
6115 Statements => New_List (
6116 Make_Implicit_Label_Declaration (Loc,
6117 Defining_Identifier => Blk_Ent,
6118 Label_Construct => Abortable_Block),
6120 Exception_Handlers => Hdle)))));
6122 Stmts := New_List (Ecall);
6124 -- Construct statement sequence for new block
6127 Make_Implicit_If_Statement (N,
6128 Condition => Make_Function_Call (Loc,
6129 Name => New_Reference_To (
6130 RTE (RE_Timed_Out), Loc),
6131 Parameter_Associations => New_List (
6132 Make_Attribute_Reference (Loc,
6133 Prefix => New_Reference_To (Dblock_Ent, Loc),
6134 Attribute_Name => Name_Unchecked_Access))),
6135 Then_Statements => Tstats));
6137 -- The result is the new block
6139 Set_Entry_Cancel_Parameter (Blk_Ent, Dblock_Ent);
6142 Make_Block_Statement (Loc,
6143 Declarations => New_List (
6144 Make_Object_Declaration (Loc,
6145 Defining_Identifier => Dblock_Ent,
6146 Aliased_Present => True,
6147 Object_Definition => New_Reference_To (
6148 RTE (RE_Delay_Block), Loc))),
6150 Handled_Statement_Sequence =>
6151 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
6161 Extract_Entry (Ecall, Concval, Ename, Index);
6162 Build_Simple_Entry_Call (Ecall, Concval, Ename, Index);
6164 Stmts := Statements (Handled_Statement_Sequence (Ecall));
6165 Decls := Declarations (Ecall);
6167 if Is_Protected_Type (Etype (Concval)) then
6169 -- Get the declarations of the block expanded from the entry call
6171 Decl := First (Decls);
6172 while Present (Decl)
6174 (Nkind (Decl) /= N_Object_Declaration
6175 or else not Is_RTE (Etype (Object_Definition (Decl)),
6176 RE_Communication_Block))
6181 pragma Assert (Present (Decl));
6182 Cancel_Param := Defining_Identifier (Decl);
6184 -- Change the mode of the Protected_Entry_Call call
6186 -- Protected_Entry_Call (
6187 -- Object => po._object'Access,
6188 -- E => <entry index>;
6189 -- Uninterpreted_Data => P'Address;
6190 -- Mode => Asynchronous_Call;
6193 Stmt := First (Stmts);
6195 -- Skip assignments to temporaries created for in-out parameters
6197 -- This makes unwarranted assumptions about the shape of the expanded
6198 -- tree for the call, and should be cleaned up ???
6200 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
6206 Param := First (Parameter_Associations (Call));
6207 while Present (Param)
6208 and then not Is_RTE (Etype (Param), RE_Call_Modes)
6213 pragma Assert (Present (Param));
6214 Rewrite (Param, New_Reference_To (RTE (RE_Asynchronous_Call), Loc));
6217 -- Append an if statement to execute the abortable part
6220 -- if Enqueued (Bnn) then
6223 Make_Implicit_If_Statement (N,
6224 Condition => Make_Function_Call (Loc,
6225 Name => New_Reference_To (
6226 RTE (RE_Enqueued), Loc),
6227 Parameter_Associations => New_List (
6228 New_Reference_To (Cancel_Param, Loc))),
6229 Then_Statements => Astats));
6232 Make_Block_Statement (Loc,
6233 Identifier => New_Reference_To (Blk_Ent, Loc),
6234 Handled_Statement_Sequence =>
6235 Make_Handled_Sequence_Of_Statements (Loc,
6236 Statements => Stmts),
6237 Has_Created_Identifier => True,
6238 Is_Asynchronous_Call_Block => True);
6240 -- For the VM call Update_Exception instead of Abort_Undefer.
6241 -- See 4jexcept.ads for an explanation.
6243 if VM_Target = No_VM then
6244 Target_Undefer := RE_Abort_Undefer;
6246 Target_Undefer := RE_Update_Exception;
6248 New_List (Make_Function_Call (Loc,
6249 Name => New_Occurrence_Of
6250 (RTE (RE_Current_Target_Exception), Loc)));
6254 Make_Block_Statement (Loc,
6255 Handled_Statement_Sequence =>
6256 Make_Handled_Sequence_Of_Statements (Loc,
6257 Statements => New_List (
6258 Make_Implicit_Label_Declaration (Loc,
6259 Defining_Identifier => Blk_Ent,
6260 Label_Construct => Abortable_Block),
6265 Exception_Handlers => New_List (
6266 Make_Implicit_Exception_Handler (Loc,
6268 -- when Abort_Signal =>
6269 -- Abort_Undefer.all;
6271 Exception_Choices =>
6272 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
6273 Statements => New_List (
6274 Make_Procedure_Call_Statement (Loc,
6275 Name => New_Reference_To (
6276 RTE (Target_Undefer), Loc),
6277 Parameter_Associations => Undefer_Args)))))),
6279 -- if not Cancelled (Bnn) then
6280 -- triggered statements
6283 Make_Implicit_If_Statement (N,
6284 Condition => Make_Op_Not (Loc,
6286 Make_Function_Call (Loc,
6287 Name => New_Occurrence_Of (RTE (RE_Cancelled), Loc),
6288 Parameter_Associations => New_List (
6289 New_Occurrence_Of (Cancel_Param, Loc)))),
6290 Then_Statements => Tstats));
6292 -- Asynchronous task entry call
6299 B := Make_Defining_Identifier (Loc, Name_uB);
6301 -- Insert declaration of B in declarations of existing block
6304 Make_Object_Declaration (Loc,
6305 Defining_Identifier => B,
6306 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
6308 Cancel_Param := Make_Defining_Identifier (Loc, Name_uC);
6310 -- Insert declaration of C in declarations of existing block
6313 Make_Object_Declaration (Loc,
6314 Defining_Identifier => Cancel_Param,
6315 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
6317 -- Remove and save the call to Call_Simple
6319 Stmt := First (Stmts);
6321 -- Skip assignments to temporaries created for in-out parameters.
6322 -- This makes unwarranted assumptions about the shape of the expanded
6323 -- tree for the call, and should be cleaned up ???
6325 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
6331 -- Create the inner block to protect the abortable part
6334 Make_Implicit_Exception_Handler (Loc,
6335 Exception_Choices =>
6336 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
6339 Make_Procedure_Call_Statement (Loc,
6340 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)))));
6343 Make_Procedure_Call_Statement (Loc,
6344 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)));
6347 Make_Block_Statement (Loc,
6348 Identifier => New_Reference_To (Blk_Ent, Loc),
6349 Handled_Statement_Sequence =>
6350 Make_Handled_Sequence_Of_Statements (Loc,
6351 Statements => Astats),
6352 Has_Created_Identifier => True,
6353 Is_Asynchronous_Call_Block => True);
6356 Make_Block_Statement (Loc,
6357 Handled_Statement_Sequence =>
6358 Make_Handled_Sequence_Of_Statements (Loc,
6359 Statements => New_List (
6360 Make_Implicit_Label_Declaration (Loc,
6361 Defining_Identifier =>
6366 Exception_Handlers => Hdle)));
6368 -- Create new call statement
6370 Params := Parameter_Associations (Call);
6373 New_Reference_To (RTE (RE_Asynchronous_Call), Loc));
6375 New_Reference_To (B, Loc));
6378 Make_Procedure_Call_Statement (Loc,
6380 New_Reference_To (RTE (RE_Task_Entry_Call), Loc),
6381 Parameter_Associations => Params));
6383 -- Construct statement sequence for new block
6386 Make_Implicit_If_Statement (N,
6389 New_Reference_To (Cancel_Param, Loc)),
6390 Then_Statements => Tstats));
6392 -- Protected the call against abort
6395 Make_Procedure_Call_Statement (Loc,
6396 Name => New_Reference_To (RTE (RE_Abort_Defer), Loc),
6397 Parameter_Associations => Empty_List));
6400 Set_Entry_Cancel_Parameter (Blk_Ent, Cancel_Param);
6402 -- The result is the new block
6405 Make_Block_Statement (Loc,
6406 Declarations => Decls,
6407 Handled_Statement_Sequence =>
6408 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
6411 end Expand_N_Asynchronous_Select;
6413 -------------------------------------
6414 -- Expand_N_Conditional_Entry_Call --
6415 -------------------------------------
6417 -- The conditional task entry call is converted to a call to
6422 -- P : parms := (parm, parm, parm);
6426 -- (<acceptor-task>, -- Acceptor
6427 -- <entry-index>, -- E
6428 -- P'Address, -- Uninterpreted_Data
6429 -- Conditional_Call, -- Mode
6430 -- B); -- Rendezvous_Successful
6435 -- normal-statements
6441 -- For a description of the use of P and the assignments after the call,
6442 -- see Expand_N_Entry_Call_Statement. Note that the entry call of the
6443 -- conditional entry call has already been expanded (by the Expand_N_Entry
6444 -- _Call_Statement procedure) as follows:
6447 -- P : parms := (parm, parm, parm);
6449 -- ... info for in-out parameters
6450 -- Call_Simple (acceptor-task, entry-index, P'Address);
6456 -- so the task at hand is to convert the latter expansion into the former
6458 -- The conditional protected entry call is converted to a call to
6459 -- Protected_Entry_Call:
6462 -- P : parms := (parm, parm, parm);
6463 -- Bnn : Communications_Block;
6466 -- Protected_Entry_Call
6467 -- (po._object'Access, -- Object
6468 -- <entry index>, -- E
6469 -- P'Address, -- Uninterpreted_Data
6470 -- Conditional_Call, -- Mode
6475 -- if Cancelled (Bnn) then
6478 -- normal-statements
6482 -- Ada 2005 (AI-345): A dispatching conditional entry call is converted
6486 -- B : Boolean := False;
6487 -- C : Ada.Tags.Prim_Op_Kind;
6488 -- K : Ada.Tags.Tagged_Kind :=
6489 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
6490 -- P : Parameters := (Param1 .. ParamN);
6494 -- if K = Ada.Tags.TK_Limited_Tagged then
6495 -- <dispatching-call>;
6496 -- <triggering-statements>
6500 -- Ada.Tags.Get_Offset_Index
6501 -- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
6503 -- _Disp_Conditional_Select (<object>, S, P'Address, C, B);
6505 -- if C = POK_Protected_Entry
6506 -- or else C = POK_Task_Entry
6508 -- Param1 := P.Param1;
6510 -- ParamN := P.ParamN;
6514 -- if C = POK_Procedure
6515 -- or else C = POK_Protected_Procedure
6516 -- or else C = POK_Task_Procedure
6518 -- <dispatching-call>;
6521 -- <triggering-statements>
6523 -- <else-statements>
6528 procedure Expand_N_Conditional_Entry_Call (N : Node_Id) is
6529 Loc : constant Source_Ptr := Sloc (N);
6530 Alt : constant Node_Id := Entry_Call_Alternative (N);
6531 Blk : Node_Id := Entry_Call_Statement (Alt);
6534 Blk_Typ : Entity_Id;
6536 Call_Ent : Entity_Id;
6537 Conc_Typ_Stmts : List_Id;
6541 Lim_Typ_Stmts : List_Id;
6548 Transient_Blk : Node_Id;
6551 B : Entity_Id; -- Call status flag
6552 C : Entity_Id; -- Call kind
6553 K : Entity_Id; -- Tagged kind
6554 P : Entity_Id; -- Parameter block
6555 S : Entity_Id; -- Primitive operation slot
6558 if Ada_Version >= Ada_05
6559 and then Nkind (Blk) = N_Procedure_Call_Statement
6561 Extract_Dispatching_Call (Blk, Call_Ent, Obj, Actuals, Formals);
6566 -- Call status flag processing, generate:
6567 -- B : Boolean := False;
6569 B := Build_B (Loc, Decls);
6571 -- Call kind processing, generate:
6572 -- C : Ada.Tags.Prim_Op_Kind;
6574 C := Build_C (Loc, Decls);
6576 -- Tagged kind processing, generate:
6577 -- K : Ada.Tags.Tagged_Kind :=
6578 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
6580 K := Build_K (Loc, Decls, Obj);
6582 -- Parameter block processing
6584 Blk_Typ := Build_Parameter_Block (Loc, Actuals, Formals, Decls);
6585 P := Parameter_Block_Pack
6586 (Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
6588 -- Dispatch table slot processing, generate:
6591 S := Build_S (Loc, Decls);
6594 -- S := Ada.Tags.Get_Offset_Index
6595 -- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
6598 New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
6601 -- _Disp_Conditional_Select (<object>, S, P'Address, C, B);
6603 Append_To (Conc_Typ_Stmts,
6604 Make_Procedure_Call_Statement (Loc,
6607 Find_Prim_Op (Etype (Etype (Obj)),
6608 Name_uDisp_Conditional_Select),
6610 Parameter_Associations =>
6612 New_Copy_Tree (Obj), -- <object>
6613 New_Reference_To (S, Loc), -- S
6614 Make_Attribute_Reference (Loc, -- P'Address
6616 New_Reference_To (P, Loc),
6619 New_Reference_To (C, Loc), -- C
6620 New_Reference_To (B, Loc)))); -- B
6623 -- if C = POK_Protected_Entry
6624 -- or else C = POK_Task_Entry
6626 -- Param1 := P.Param1;
6628 -- ParamN := P.ParamN;
6631 Unpack := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
6633 -- Generate the if statement only when the packed parameters need
6634 -- explicit assignments to their corresponding actuals.
6636 if Present (Unpack) then
6637 Append_To (Conc_Typ_Stmts,
6638 Make_If_Statement (Loc,
6645 New_Reference_To (C, Loc),
6647 New_Reference_To (RTE (
6648 RE_POK_Protected_Entry), Loc)),
6652 New_Reference_To (C, Loc),
6654 New_Reference_To (RTE (RE_POK_Task_Entry), Loc))),
6662 -- if C = POK_Procedure
6663 -- or else C = POK_Protected_Procedure
6664 -- or else C = POK_Task_Procedure
6666 -- <dispatching-call>
6668 -- <normal-statements>
6670 -- <else-statements>
6673 N_Stats := New_Copy_List_Tree (Statements (Alt));
6675 Prepend_To (N_Stats,
6676 Make_If_Statement (Loc,
6682 New_Reference_To (C, Loc),
6684 New_Reference_To (RTE (RE_POK_Procedure), Loc)),
6691 New_Reference_To (C, Loc),
6693 New_Reference_To (RTE (
6694 RE_POK_Protected_Procedure), Loc)),
6699 New_Reference_To (C, Loc),
6701 New_Reference_To (RTE (
6702 RE_POK_Task_Procedure), Loc)))),
6707 Append_To (Conc_Typ_Stmts,
6708 Make_If_Statement (Loc,
6709 Condition => New_Reference_To (B, Loc),
6710 Then_Statements => N_Stats,
6711 Else_Statements => Else_Statements (N)));
6714 -- <dispatching-call>;
6715 -- <triggering-statements>
6717 Lim_Typ_Stmts := New_Copy_List_Tree (Statements (Alt));
6718 Prepend_To (Lim_Typ_Stmts, New_Copy_Tree (Blk));
6721 -- if K = Ada.Tags.TK_Limited_Tagged then
6728 Make_If_Statement (Loc,
6732 New_Reference_To (K, Loc),
6734 New_Reference_To (RTE (RE_TK_Limited_Tagged), Loc)),
6743 Make_Block_Statement (Loc,
6746 Handled_Statement_Sequence =>
6747 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
6749 -- As described above, The entry alternative is transformed into a
6750 -- block that contains the gnulli call, and possibly assignment
6751 -- statements for in-out parameters. The gnulli call may itself be
6752 -- rewritten into a transient block if some unconstrained parameters
6753 -- require it. We need to retrieve the call to complete its parameter
6758 First_Real_Statement (Handled_Statement_Sequence (Blk));
6760 if Present (Transient_Blk)
6761 and then Nkind (Transient_Blk) = N_Block_Statement
6763 Blk := Transient_Blk;
6766 Stmts := Statements (Handled_Statement_Sequence (Blk));
6767 Stmt := First (Stmts);
6768 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
6773 Params := Parameter_Associations (Call);
6775 if Is_RTE (Entity (Name (Call)), RE_Protected_Entry_Call) then
6777 -- Substitute Conditional_Entry_Call for Simple_Call parameter
6779 Param := First (Params);
6780 while Present (Param)
6781 and then not Is_RTE (Etype (Param), RE_Call_Modes)
6786 pragma Assert (Present (Param));
6787 Rewrite (Param, New_Reference_To (RTE (RE_Conditional_Call), Loc));
6791 -- Find the Communication_Block parameter for the call to the
6792 -- Cancelled function.
6794 Decl := First (Declarations (Blk));
6795 while Present (Decl)
6796 and then not Is_RTE (Etype (Object_Definition (Decl)),
6797 RE_Communication_Block)
6802 -- Add an if statement to execute the else part if the call
6803 -- does not succeed (as indicated by the Cancelled predicate).
6806 Make_Implicit_If_Statement (N,
6807 Condition => Make_Function_Call (Loc,
6808 Name => New_Reference_To (RTE (RE_Cancelled), Loc),
6809 Parameter_Associations => New_List (
6810 New_Reference_To (Defining_Identifier (Decl), Loc))),
6811 Then_Statements => Else_Statements (N),
6812 Else_Statements => Statements (Alt)));
6815 B := Make_Defining_Identifier (Loc, Name_uB);
6817 -- Insert declaration of B in declarations of existing block
6819 if No (Declarations (Blk)) then
6820 Set_Declarations (Blk, New_List);
6823 Prepend_To (Declarations (Blk),
6824 Make_Object_Declaration (Loc,
6825 Defining_Identifier => B,
6826 Object_Definition =>
6827 New_Reference_To (Standard_Boolean, Loc)));
6829 -- Create new call statement
6832 New_Reference_To (RTE (RE_Conditional_Call), Loc));
6833 Append_To (Params, New_Reference_To (B, Loc));
6836 Make_Procedure_Call_Statement (Loc,
6837 Name => New_Reference_To (RTE (RE_Task_Entry_Call), Loc),
6838 Parameter_Associations => Params));
6840 -- Construct statement sequence for new block
6843 Make_Implicit_If_Statement (N,
6844 Condition => New_Reference_To (B, Loc),
6845 Then_Statements => Statements (Alt),
6846 Else_Statements => Else_Statements (N)));
6849 -- The result is the new block
6852 Make_Block_Statement (Loc,
6853 Declarations => Declarations (Blk),
6854 Handled_Statement_Sequence =>
6855 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
6859 end Expand_N_Conditional_Entry_Call;
6861 ---------------------------------------
6862 -- Expand_N_Delay_Relative_Statement --
6863 ---------------------------------------
6865 -- Delay statement is implemented as a procedure call to Delay_For
6866 -- defined in Ada.Calendar.Delays in order to reduce the overhead of
6867 -- simple delays imposed by the use of Protected Objects.
6869 procedure Expand_N_Delay_Relative_Statement (N : Node_Id) is
6870 Loc : constant Source_Ptr := Sloc (N);
6873 Make_Procedure_Call_Statement (Loc,
6874 Name => New_Reference_To (RTE (RO_CA_Delay_For), Loc),
6875 Parameter_Associations => New_List (Expression (N))));
6877 end Expand_N_Delay_Relative_Statement;
6879 ------------------------------------
6880 -- Expand_N_Delay_Until_Statement --
6881 ------------------------------------
6883 -- Delay Until statement is implemented as a procedure call to
6884 -- Delay_Until defined in Ada.Calendar.Delays and Ada.Real_Time.Delays.
6886 procedure Expand_N_Delay_Until_Statement (N : Node_Id) is
6887 Loc : constant Source_Ptr := Sloc (N);
6891 if Is_RTE (Base_Type (Etype (Expression (N))), RO_CA_Time) then
6892 Typ := RTE (RO_CA_Delay_Until);
6894 Typ := RTE (RO_RT_Delay_Until);
6898 Make_Procedure_Call_Statement (Loc,
6899 Name => New_Reference_To (Typ, Loc),
6900 Parameter_Associations => New_List (Expression (N))));
6903 end Expand_N_Delay_Until_Statement;
6905 -------------------------
6906 -- Expand_N_Entry_Body --
6907 -------------------------
6909 procedure Expand_N_Entry_Body (N : Node_Id) is
6911 -- Associate discriminals with the next protected operation body to be
6914 if Present (Next_Protected_Operation (N)) then
6915 Set_Discriminals (Parent (Current_Scope));
6917 end Expand_N_Entry_Body;
6919 -----------------------------------
6920 -- Expand_N_Entry_Call_Statement --
6921 -----------------------------------
6923 -- An entry call is expanded into GNARLI calls to implement a simple entry
6924 -- call (see Build_Simple_Entry_Call).
6926 procedure Expand_N_Entry_Call_Statement (N : Node_Id) is
6932 if No_Run_Time_Mode then
6933 Error_Msg_CRT ("entry call", N);
6937 -- If this entry call is part of an asynchronous select, don't expand it
6938 -- here; it will be expanded with the select statement. Don't expand
6939 -- timed entry calls either, as they are translated into asynchronous
6942 -- ??? This whole approach is questionable; it may be better to go back
6943 -- to allowing the expansion to take place and then attempting to fix it
6944 -- up in Expand_N_Asynchronous_Select. The tricky part is figuring out
6945 -- whether the expanded call is on a task or protected entry.
6947 if (Nkind (Parent (N)) /= N_Triggering_Alternative
6948 or else N /= Triggering_Statement (Parent (N)))
6949 and then (Nkind (Parent (N)) /= N_Entry_Call_Alternative
6950 or else N /= Entry_Call_Statement (Parent (N))
6951 or else Nkind (Parent (Parent (N))) /= N_Timed_Entry_Call)
6953 Extract_Entry (N, Concval, Ename, Index);
6954 Build_Simple_Entry_Call (N, Concval, Ename, Index);
6956 end Expand_N_Entry_Call_Statement;
6958 --------------------------------
6959 -- Expand_N_Entry_Declaration --
6960 --------------------------------
6962 -- If there are parameters, then first, each of the formals is marked by
6963 -- setting Is_Entry_Formal. Next a record type is built which is used to
6964 -- hold the parameter values. The name of this record type is entryP where
6965 -- entry is the name of the entry, with an additional corresponding access
6966 -- type called entryPA. The record type has matching components for each
6967 -- formal (the component names are the same as the formal names). For
6968 -- elementary types, the component type matches the formal type. For
6969 -- composite types, an access type is declared (with the name formalA)
6970 -- which designates the formal type, and the type of the component is this
6971 -- access type. Finally the Entry_Component of each formal is set to
6972 -- reference the corresponding record component.
6974 procedure Expand_N_Entry_Declaration (N : Node_Id) is
6975 Loc : constant Source_Ptr := Sloc (N);
6976 Entry_Ent : constant Entity_Id := Defining_Identifier (N);
6977 Components : List_Id;
6980 Last_Decl : Node_Id;
6981 Component : Entity_Id;
6984 Rec_Ent : Entity_Id;
6985 Acc_Ent : Entity_Id;
6988 Formal := First_Formal (Entry_Ent);
6991 -- Most processing is done only if parameters are present
6993 if Present (Formal) then
6994 Components := New_List;
6996 -- Loop through formals
6998 while Present (Formal) loop
6999 Set_Is_Entry_Formal (Formal);
7001 Make_Defining_Identifier (Sloc (Formal), Chars (Formal));
7002 Set_Entry_Component (Formal, Component);
7003 Set_Entry_Formal (Component, Formal);
7004 Ftype := Etype (Formal);
7006 -- Declare new access type and then append
7009 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
7012 Make_Full_Type_Declaration (Loc,
7013 Defining_Identifier => Ctype,
7015 Make_Access_To_Object_Definition (Loc,
7016 All_Present => True,
7017 Constant_Present => Ekind (Formal) = E_In_Parameter,
7018 Subtype_Indication => New_Reference_To (Ftype, Loc)));
7020 Insert_After (Last_Decl, Decl);
7023 Append_To (Components,
7024 Make_Component_Declaration (Loc,
7025 Defining_Identifier => Component,
7026 Component_Definition =>
7027 Make_Component_Definition (Loc,
7028 Aliased_Present => False,
7029 Subtype_Indication => New_Reference_To (Ctype, Loc))));
7031 Next_Formal_With_Extras (Formal);
7034 -- Create the Entry_Parameter_Record declaration
7037 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
7040 Make_Full_Type_Declaration (Loc,
7041 Defining_Identifier => Rec_Ent,
7043 Make_Record_Definition (Loc,
7045 Make_Component_List (Loc,
7046 Component_Items => Components)));
7048 Insert_After (Last_Decl, Decl);
7051 -- Construct and link in the corresponding access type
7054 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
7056 Set_Entry_Parameters_Type (Entry_Ent, Acc_Ent);
7059 Make_Full_Type_Declaration (Loc,
7060 Defining_Identifier => Acc_Ent,
7062 Make_Access_To_Object_Definition (Loc,
7063 All_Present => True,
7064 Subtype_Indication => New_Reference_To (Rec_Ent, Loc)));
7066 Insert_After (Last_Decl, Decl);
7069 end Expand_N_Entry_Declaration;
7071 -----------------------------
7072 -- Expand_N_Protected_Body --
7073 -----------------------------
7075 -- Protected bodies are expanded to the completion of the subprograms
7076 -- created for the corresponding protected type. These are a protected and
7077 -- unprotected version of each protected subprogram in the object, a
7078 -- function to calculate each entry barrier, and a procedure to execute the
7079 -- sequence of statements of each protected entry body. For example, for
7080 -- protected type ptype:
7083 -- (O : System.Address;
7084 -- E : Protected_Entry_Index)
7087 -- <discriminant renamings>
7088 -- <private object renamings>
7090 -- return <barrier expression>;
7093 -- procedure pprocN (_object : in out poV;...) is
7094 -- <discriminant renamings>
7095 -- <private object renamings>
7097 -- <sequence of statements>
7100 -- procedure pprocP (_object : in out poV;...) is
7101 -- procedure _clean is
7104 -- ptypeS (_object, Pn);
7105 -- Unlock (_object._object'Access);
7106 -- Abort_Undefer.all;
7111 -- Lock (_object._object'Access);
7112 -- pprocN (_object;...);
7117 -- function pfuncN (_object : poV;...) return Return_Type is
7118 -- <discriminant renamings>
7119 -- <private object renamings>
7121 -- <sequence of statements>
7124 -- function pfuncP (_object : poV) return Return_Type is
7125 -- procedure _clean is
7127 -- Unlock (_object._object'Access);
7128 -- Abort_Undefer.all;
7133 -- Lock (_object._object'Access);
7134 -- return pfuncN (_object);
7141 -- (O : System.Address;
7142 -- P : System.Address;
7143 -- E : Protected_Entry_Index)
7145 -- <discriminant renamings>
7146 -- <private object renamings>
7147 -- type poVP is access poV;
7148 -- _Object : ptVP := ptVP!(O);
7152 -- <statement sequence>
7153 -- Complete_Entry_Body (_Object._Object);
7155 -- when all others =>
7156 -- Exceptional_Complete_Entry_Body (
7157 -- _Object._Object, Get_GNAT_Exception);
7161 -- The type poV is the record created for the protected type to hold
7162 -- the state of the protected object.
7164 procedure Expand_N_Protected_Body (N : Node_Id) is
7165 Loc : constant Source_Ptr := Sloc (N);
7166 Pid : constant Entity_Id := Corresponding_Spec (N);
7168 Current_Node : Node_Id;
7169 Disp_Op_Body : Node_Id;
7170 New_Op_Body : Node_Id;
7171 Num_Entries : Natural := 0;
7176 Chain : Entity_Id := Empty;
7177 -- Finalization chain that may be attached to new body
7179 function Build_Dispatching_Subprogram_Body
7182 Prot_Bod : Node_Id) return Node_Id;
7183 -- Build a dispatching version of the protected subprogram body. The
7184 -- newly generated subprogram contains a call to the original protected
7185 -- body. The following code is generated:
7187 -- function <protected-function-name> (Param1 .. ParamN) return
7190 -- return <protected-function-name>P (Param1 .. ParamN);
7191 -- end <protected-function-name>;
7195 -- procedure <protected-procedure-name> (Param1 .. ParamN) is
7197 -- <protected-procedure-name>P (Param1 .. ParamN);
7198 -- end <protected-procedure-name>
7200 ---------------------------------------
7201 -- Build_Dispatching_Subprogram_Body --
7202 ---------------------------------------
7204 function Build_Dispatching_Subprogram_Body
7207 Prot_Bod : Node_Id) return Node_Id
7209 Loc : constant Source_Ptr := Sloc (N);
7216 -- Generate a specification without a letter suffix in order to
7217 -- override an interface function or procedure.
7220 Build_Protected_Sub_Specification (N, Pid, Dispatching_Mode);
7222 -- The formal parameters become the actuals of the protected
7223 -- function or procedure call.
7225 Actuals := New_List;
7226 Formal := First (Parameter_Specifications (Spec));
7227 while Present (Formal) loop
7229 Make_Identifier (Loc, Chars (Defining_Identifier (Formal))));
7234 if Nkind (Spec) = N_Procedure_Specification then
7237 Make_Procedure_Call_Statement (Loc,
7239 New_Reference_To (Corresponding_Spec (Prot_Bod), Loc),
7240 Parameter_Associations => Actuals));
7242 pragma Assert (Nkind (Spec) = N_Function_Specification);
7246 Make_Simple_Return_Statement (Loc,
7248 Make_Function_Call (Loc,
7250 New_Reference_To (Corresponding_Spec (Prot_Bod), Loc),
7251 Parameter_Associations => Actuals)));
7255 Make_Subprogram_Body (Loc,
7256 Declarations => Empty_List,
7257 Specification => Spec,
7258 Handled_Statement_Sequence =>
7259 Make_Handled_Sequence_Of_Statements (Loc, Stmts));
7260 end Build_Dispatching_Subprogram_Body;
7262 -- Start of processing for Expand_N_Protected_Body
7265 if No_Run_Time_Mode then
7266 Error_Msg_CRT ("protected body", N);
7270 -- This is the proper body corresponding to a stub. The declarations
7271 -- must be inserted at the point of the stub, which in turn is in the
7272 -- declarative part of the parent unit.
7274 if Nkind (Parent (N)) = N_Subunit then
7275 Current_Node := Corresponding_Stub (Parent (N));
7280 Op_Body := First (Declarations (N));
7282 -- The protected body is replaced with the bodies of its
7283 -- protected operations, and the declarations for internal objects
7284 -- that may have been created for entry family bounds.
7286 Rewrite (N, Make_Null_Statement (Sloc (N)));
7289 while Present (Op_Body) loop
7290 case Nkind (Op_Body) is
7291 when N_Subprogram_Declaration =>
7294 when N_Subprogram_Body =>
7296 -- Do not create bodies for eliminated operations
7298 if not Is_Eliminated (Defining_Entity (Op_Body))
7299 and then not Is_Eliminated (Corresponding_Spec (Op_Body))
7302 Build_Unprotected_Subprogram_Body (Op_Body, Pid);
7304 -- Propagate the finalization chain to the new body. In the
7305 -- unlikely event that the subprogram contains a declaration
7306 -- or allocator for an object that requires finalization,
7307 -- the corresponding chain is created when analyzing the
7308 -- body, and attached to its entity. This entity is not
7309 -- further elaborated, and so the chain properly belongs to
7310 -- the newly created subprogram body.
7313 Finalization_Chain_Entity (Defining_Entity (Op_Body));
7315 if Present (Chain) then
7316 Set_Finalization_Chain_Entity
7317 (Protected_Body_Subprogram
7318 (Corresponding_Spec (Op_Body)), Chain);
7320 (Handled_Statement_Sequence (New_Op_Body), False);
7323 Insert_After (Current_Node, New_Op_Body);
7324 Current_Node := New_Op_Body;
7325 Analyze (New_Op_Body);
7327 -- Build the corresponding protected operation. It may
7328 -- appear that this is needed only if this is a visible
7329 -- operation of the type, or if it is an interrupt handler,
7330 -- and this was the strategy used previously in GNAT.
7331 -- However, the operation may be exported through a 'Access
7332 -- to an external caller. This is the common idiom in code
7333 -- that uses the Ada 2005 Timing_Events package. As a result
7334 -- we need to produce the protected body for both visible
7335 -- and private operations.
7337 if Present (Corresponding_Spec (Op_Body)) then
7339 Unit_Declaration_Node (Corresponding_Spec (Op_Body));
7341 if Nkind (Parent (Op_Decl)) =
7342 N_Protected_Definition
7345 Build_Protected_Subprogram_Body (
7346 Op_Body, Pid, Specification (New_Op_Body));
7348 Insert_After (Current_Node, New_Op_Body);
7349 Analyze (New_Op_Body);
7351 Current_Node := New_Op_Body;
7353 -- Generate an overriding primitive operation body for
7354 -- this subprogram if the protected type implements
7357 if Ada_Version >= Ada_05
7358 and then Present (Interfaces (
7359 Corresponding_Record_Type (Pid)))
7362 Build_Dispatching_Subprogram_Body (
7363 Op_Body, Pid, New_Op_Body);
7365 Insert_After (Current_Node, Disp_Op_Body);
7366 Analyze (Disp_Op_Body);
7368 Current_Node := Disp_Op_Body;
7374 when N_Entry_Body =>
7375 Op_Id := Defining_Identifier (Op_Body);
7376 Num_Entries := Num_Entries + 1;
7378 New_Op_Body := Build_Protected_Entry (Op_Body, Op_Id, Pid);
7380 Insert_After (Current_Node, New_Op_Body);
7381 Current_Node := New_Op_Body;
7382 Analyze (New_Op_Body);
7384 when N_Implicit_Label_Declaration =>
7387 when N_Itype_Reference =>
7388 Insert_After (Current_Node, New_Copy (Op_Body));
7390 when N_Freeze_Entity =>
7391 New_Op_Body := New_Copy (Op_Body);
7393 if Present (Entity (Op_Body))
7394 and then Freeze_Node (Entity (Op_Body)) = Op_Body
7396 Set_Freeze_Node (Entity (Op_Body), New_Op_Body);
7399 Insert_After (Current_Node, New_Op_Body);
7400 Current_Node := New_Op_Body;
7401 Analyze (New_Op_Body);
7404 New_Op_Body := New_Copy (Op_Body);
7405 Insert_After (Current_Node, New_Op_Body);
7406 Current_Node := New_Op_Body;
7407 Analyze (New_Op_Body);
7409 when N_Object_Declaration =>
7410 pragma Assert (not Comes_From_Source (Op_Body));
7411 New_Op_Body := New_Copy (Op_Body);
7412 Insert_After (Current_Node, New_Op_Body);
7413 Current_Node := New_Op_Body;
7414 Analyze (New_Op_Body);
7417 raise Program_Error;
7424 -- Finally, create the body of the function that maps an entry index
7425 -- into the corresponding body index, except when there is no entry,
7426 -- or in a ravenscar-like profile.
7428 if Corresponding_Runtime_Package (Pid) =
7429 System_Tasking_Protected_Objects_Entries
7431 New_Op_Body := Build_Find_Body_Index (Pid);
7432 Insert_After (Current_Node, New_Op_Body);
7433 Current_Node := New_Op_Body;
7434 Analyze (New_Op_Body);
7437 -- Ada 2005 (AI-345): Construct the primitive wrapper bodies after the
7438 -- protected body. At this point all wrapper specs have been created,
7439 -- frozen and included in the dispatch table for the protected type.
7441 if Ada_Version >= Ada_05 then
7442 Build_Wrapper_Bodies (Loc, Pid, Current_Node);
7444 end Expand_N_Protected_Body;
7446 -----------------------------------------
7447 -- Expand_N_Protected_Type_Declaration --
7448 -----------------------------------------
7450 -- First we create a corresponding record type declaration used to
7451 -- represent values of this protected type.
7452 -- The general form of this type declaration is
7454 -- type poV (discriminants) is record
7455 -- _Object : aliased <kind>Protection
7456 -- [(<entry count> [, <handler count>])];
7457 -- [entry_family : array (bounds) of Void;]
7458 -- <private data fields>
7461 -- The discriminants are present only if the corresponding protected type
7462 -- has discriminants, and they exactly mirror the protected type
7463 -- discriminants. The private data fields similarly mirror the private
7464 -- declarations of the protected type.
7466 -- The Object field is always present. It contains RTS specific data used
7467 -- to control the protected object. It is declared as Aliased so that it
7468 -- can be passed as a pointer to the RTS. This allows the protected record
7469 -- to be referenced within RTS data structures. An appropriate Protection
7470 -- type and discriminant are generated.
7472 -- The Service field is present for protected objects with entries. It
7473 -- contains sufficient information to allow the entry service procedure for
7474 -- this object to be called when the object is not known till runtime.
7476 -- One entry_family component is present for each entry family in the
7477 -- task definition (see Expand_N_Task_Type_Declaration).
7479 -- When a protected object is declared, an instance of the protected type
7480 -- value record is created. The elaboration of this declaration creates the
7481 -- correct bounds for the entry families, and also evaluates the priority
7482 -- expression if needed. The initialization routine for the protected type
7483 -- itself then calls Initialize_Protection with appropriate parameters to
7484 -- initialize the value of the Task_Id field. Install_Handlers may be also
7485 -- called if a pragma Attach_Handler applies.
7487 -- Note: this record is passed to the subprograms created by the expansion
7488 -- of protected subprograms and entries. It is an in parameter to protected
7489 -- functions and an in out parameter to procedures and entry bodies. The
7490 -- Entity_Id for this created record type is placed in the
7491 -- Corresponding_Record_Type field of the associated protected type entity.
7493 -- Next we create a procedure specifications for protected subprograms and
7494 -- entry bodies. For each protected subprograms two subprograms are
7495 -- created, an unprotected and a protected version. The unprotected version
7496 -- is called from within other operations of the same protected object.
7498 -- We also build the call to register the procedure if a pragma
7499 -- Interrupt_Handler applies.
7501 -- A single subprogram is created to service all entry bodies; it has an
7502 -- additional boolean out parameter indicating that the previous entry call
7503 -- made by the current task was serviced immediately, i.e. not by proxy.
7504 -- The O parameter contains a pointer to a record object of the type
7505 -- described above. An untyped interface is used here to allow this
7506 -- procedure to be called in places where the type of the object to be
7507 -- serviced is not known. This must be done, for example, when a call that
7508 -- may have been requeued is cancelled; the corresponding object must be
7509 -- serviced, but which object that is not known till runtime.
7512 -- (O : System.Address; P : out Boolean);
7513 -- procedure pprocN (_object : in out poV);
7514 -- procedure pproc (_object : in out poV);
7515 -- function pfuncN (_object : poV);
7516 -- function pfunc (_object : poV);
7519 -- Note that this must come after the record type declaration, since
7520 -- the specs refer to this type.
7522 procedure Expand_N_Protected_Type_Declaration (N : Node_Id) is
7523 Loc : constant Source_Ptr := Sloc (N);
7524 Prot_Typ : constant Entity_Id := Defining_Identifier (N);
7526 Pdef : constant Node_Id := Protected_Definition (N);
7527 -- This contains two lists; one for visible and one for private decls
7531 Discr_Map : constant Elist_Id := New_Elmt_List;
7535 Comp_Id : Entity_Id;
7537 Current_Node : Node_Id := N;
7538 Bdef : Entity_Id := Empty; -- avoid uninit warning
7539 Edef : Entity_Id := Empty; -- avoid uninit warning
7540 Entries_Aggr : Node_Id;
7541 Body_Id : Entity_Id;
7544 Object_Comp : Node_Id;
7546 procedure Check_Inlining (Subp : Entity_Id);
7547 -- If the original operation has a pragma Inline, propagate the flag
7548 -- to the internal body, for possible inlining later on. The source
7549 -- operation is invisible to the back-end and is never actually called.
7551 function Static_Component_Size (Comp : Entity_Id) return Boolean;
7552 -- When compiling under the Ravenscar profile, private components must
7553 -- have a static size, or else a protected object will require heap
7554 -- allocation, violating the corresponding restriction. It is preferable
7555 -- to make this check here, because it provides a better error message
7556 -- than the back-end, which refers to the object as a whole.
7558 procedure Register_Handler;
7559 -- For a protected operation that is an interrupt handler, add the
7560 -- freeze action that will register it as such.
7562 --------------------
7563 -- Check_Inlining --
7564 --------------------
7566 procedure Check_Inlining (Subp : Entity_Id) is
7568 if Is_Inlined (Subp) then
7569 Set_Is_Inlined (Protected_Body_Subprogram (Subp));
7570 Set_Is_Inlined (Subp, False);
7574 ---------------------------------
7575 -- Check_Static_Component_Size --
7576 ---------------------------------
7578 function Static_Component_Size (Comp : Entity_Id) return Boolean is
7579 Typ : constant Entity_Id := Etype (Comp);
7583 if Is_Scalar_Type (Typ) then
7586 elsif Is_Array_Type (Typ) then
7587 return Compile_Time_Known_Bounds (Typ);
7589 elsif Is_Record_Type (Typ) then
7590 C := First_Component (Typ);
7591 while Present (C) loop
7592 if not Static_Component_Size (C) then
7601 -- Any other types will be checked by the back-end
7606 end Static_Component_Size;
7608 ----------------------
7609 -- Register_Handler --
7610 ----------------------
7612 procedure Register_Handler is
7614 -- All semantic checks already done in Sem_Prag
7616 Prot_Proc : constant Entity_Id :=
7618 (Specification (Current_Node));
7620 Proc_Address : constant Node_Id :=
7621 Make_Attribute_Reference (Loc,
7622 Prefix => New_Reference_To (Prot_Proc, Loc),
7623 Attribute_Name => Name_Address);
7625 RTS_Call : constant Entity_Id :=
7626 Make_Procedure_Call_Statement (Loc,
7629 RTE (RE_Register_Interrupt_Handler), Loc),
7630 Parameter_Associations =>
7631 New_List (Proc_Address));
7633 Append_Freeze_Action (Prot_Proc, RTS_Call);
7634 end Register_Handler;
7636 -- Start of processing for Expand_N_Protected_Type_Declaration
7639 if Present (Corresponding_Record_Type (Prot_Typ)) then
7642 Rec_Decl := Build_Corresponding_Record (N, Prot_Typ, Loc);
7645 Cdecls := Component_Items (Component_List (Type_Definition (Rec_Decl)));
7647 -- Ada 2005 (AI-345): Propagate the attribute that contains the list
7648 -- of implemented interfaces.
7650 Set_Interface_List (Type_Definition (Rec_Decl), Interface_List (N));
7652 Qualify_Entity_Names (N);
7654 -- If the type has discriminants, their occurrences in the declaration
7655 -- have been replaced by the corresponding discriminals. For components
7656 -- that are constrained by discriminants, their homologues in the
7657 -- corresponding record type must refer to the discriminants of that
7658 -- record, so we must apply a new renaming to subtypes_indications:
7660 -- protected discriminant => discriminal => record discriminant
7662 -- This replacement is not applied to default expressions, for which
7663 -- the discriminal is correct.
7665 if Has_Discriminants (Prot_Typ) then
7671 Disc := First_Discriminant (Prot_Typ);
7672 Decl := First (Discriminant_Specifications (Rec_Decl));
7673 while Present (Disc) loop
7674 Append_Elmt (Discriminal (Disc), Discr_Map);
7675 Append_Elmt (Defining_Identifier (Decl), Discr_Map);
7676 Next_Discriminant (Disc);
7682 -- Fill in the component declarations
7684 -- Add components for entry families. For each entry family, create an
7685 -- anonymous type declaration with the same size, and analyze the type.
7687 Collect_Entry_Families (Loc, Cdecls, Current_Node, Prot_Typ);
7689 -- Prepend the _Object field with the right type to the component list.
7690 -- We need to compute the number of entries, and in some cases the
7691 -- number of Attach_Handler pragmas.
7695 Num_Attach_Handler : Int := 0;
7696 Protection_Subtype : Node_Id;
7697 Entry_Count_Expr : constant Node_Id :=
7698 Build_Entry_Count_Expression
7699 (Prot_Typ, Cdecls, Loc);
7702 -- Could this be simplified using Corresponding_Runtime_Package???
7704 if Has_Attach_Handler (Prot_Typ) then
7705 Ritem := First_Rep_Item (Prot_Typ);
7706 while Present (Ritem) loop
7707 if Nkind (Ritem) = N_Pragma
7708 and then Pragma_Name (Ritem) = Name_Attach_Handler
7710 Num_Attach_Handler := Num_Attach_Handler + 1;
7713 Next_Rep_Item (Ritem);
7716 if Restricted_Profile then
7717 if Has_Entries (Prot_Typ) then
7718 Protection_Subtype :=
7719 New_Reference_To (RTE (RE_Protection_Entry), Loc);
7721 Protection_Subtype :=
7722 New_Reference_To (RTE (RE_Protection), Loc);
7725 Protection_Subtype :=
7726 Make_Subtype_Indication
7730 (RTE (RE_Static_Interrupt_Protection), Loc),
7732 Make_Index_Or_Discriminant_Constraint (
7734 Constraints => New_List (
7736 Make_Integer_Literal (Loc, Num_Attach_Handler))));
7739 elsif Has_Interrupt_Handler (Prot_Typ) then
7740 Protection_Subtype :=
7741 Make_Subtype_Indication (
7743 Subtype_Mark => New_Reference_To
7744 (RTE (RE_Dynamic_Interrupt_Protection), Loc),
7746 Make_Index_Or_Discriminant_Constraint (
7748 Constraints => New_List (Entry_Count_Expr)));
7750 -- Type has explicit entries or generated primitive entry wrappers
7752 elsif Has_Entries (Prot_Typ)
7753 or else (Ada_Version >= Ada_05
7754 and then Present (Interface_List (N)))
7756 case Corresponding_Runtime_Package (Prot_Typ) is
7757 when System_Tasking_Protected_Objects_Entries =>
7758 Protection_Subtype :=
7759 Make_Subtype_Indication (Loc,
7761 New_Reference_To (RTE (RE_Protection_Entries), Loc),
7763 Make_Index_Or_Discriminant_Constraint (
7765 Constraints => New_List (Entry_Count_Expr)));
7767 when System_Tasking_Protected_Objects_Single_Entry =>
7768 Protection_Subtype :=
7769 New_Reference_To (RTE (RE_Protection_Entry), Loc);
7772 raise Program_Error;
7776 Protection_Subtype := New_Reference_To (RTE (RE_Protection), Loc);
7780 Make_Component_Declaration (Loc,
7781 Defining_Identifier =>
7782 Make_Defining_Identifier (Loc, Name_uObject),
7783 Component_Definition =>
7784 Make_Component_Definition (Loc,
7785 Aliased_Present => True,
7786 Subtype_Indication => Protection_Subtype));
7789 pragma Assert (Present (Pdef));
7791 -- Add private field components
7793 if Present (Private_Declarations (Pdef)) then
7794 Priv := First (Private_Declarations (Pdef));
7796 while Present (Priv) loop
7798 if Nkind (Priv) = N_Component_Declaration then
7799 if not Static_Component_Size (Defining_Identifier (Priv)) then
7801 -- When compiling for a restricted profile, the private
7802 -- components must have a static size. If not, this is an
7803 -- error for a single protected declaration, and rates a
7804 -- warning on a protected type declaration.
7806 if not Comes_From_Source (Prot_Typ) then
7807 Check_Restriction (No_Implicit_Heap_Allocations, Priv);
7809 elsif Restriction_Active (No_Implicit_Heap_Allocations) then
7810 Error_Msg_N ("component has non-static size?", Priv);
7812 ("\creation of protected object of type& will violate"
7813 & " restriction No_Implicit_Heap_Allocations?",
7818 -- The component definition consists of a subtype indication,
7819 -- or (in Ada 2005) an access definition. Make a copy of the
7820 -- proper definition.
7823 Old_Comp : constant Node_Id := Component_Definition (Priv);
7824 Oent : constant Entity_Id := Defining_Identifier (Priv);
7826 Nent : constant Entity_Id :=
7827 Make_Defining_Identifier
7828 (Sloc (Oent), Chars (Oent));
7831 if Present (Subtype_Indication (Old_Comp)) then
7833 Make_Component_Definition (Sloc (Oent),
7834 Aliased_Present => False,
7835 Subtype_Indication =>
7836 New_Copy_Tree (Subtype_Indication (Old_Comp),
7840 Make_Component_Definition (Sloc (Oent),
7841 Aliased_Present => False,
7842 Access_Definition =>
7843 New_Copy_Tree (Access_Definition (Old_Comp),
7848 Make_Component_Declaration (Loc,
7849 Defining_Identifier => Nent,
7850 Component_Definition => New_Comp,
7851 Expression => Expression (Priv));
7853 Set_Has_Per_Object_Constraint (Nent,
7854 Has_Per_Object_Constraint (Oent));
7856 Append_To (Cdecls, New_Priv);
7859 elsif Nkind (Priv) = N_Subprogram_Declaration then
7861 -- Make the unprotected version of the subprogram available
7862 -- for expansion of intra object calls. There is need for
7863 -- a protected version only if the subprogram is an interrupt
7864 -- handler, otherwise this operation can only be called from
7868 Make_Subprogram_Declaration (Loc,
7870 Build_Protected_Sub_Specification
7871 (Priv, Prot_Typ, Unprotected_Mode));
7873 Insert_After (Current_Node, Sub);
7876 Set_Protected_Body_Subprogram
7877 (Defining_Unit_Name (Specification (Priv)),
7878 Defining_Unit_Name (Specification (Sub)));
7879 Check_Inlining (Defining_Unit_Name (Specification (Priv)));
7880 Current_Node := Sub;
7883 Make_Subprogram_Declaration (Loc,
7885 Build_Protected_Sub_Specification
7886 (Priv, Prot_Typ, Protected_Mode));
7888 Insert_After (Current_Node, Sub);
7890 Current_Node := Sub;
7892 if Is_Interrupt_Handler
7893 (Defining_Unit_Name (Specification (Priv)))
7895 if not Restricted_Profile then
7905 -- Put the _Object component after the private component so that it
7906 -- be finalized early as required by 9.4 (20)
7908 Append_To (Cdecls, Object_Comp);
7910 Insert_After (Current_Node, Rec_Decl);
7911 Current_Node := Rec_Decl;
7913 -- Analyze the record declaration immediately after construction,
7914 -- because the initialization procedure is needed for single object
7915 -- declarations before the next entity is analyzed (the freeze call
7916 -- that generates this initialization procedure is found below).
7918 Analyze (Rec_Decl, Suppress => All_Checks);
7920 -- Ada 2005 (AI-345): Construct the primitive entry wrappers before
7921 -- the corresponding record is frozen. If any wrappers are generated,
7922 -- Current_Node is updated accordingly.
7924 if Ada_Version >= Ada_05 then
7925 Build_Wrapper_Specs (Loc, Prot_Typ, Current_Node);
7928 -- Collect pointers to entry bodies and their barriers, to be placed
7929 -- in the Entry_Bodies_Array for the type. For each entry/family we
7930 -- add an expression to the aggregate which is the initial value of
7931 -- this array. The array is declared after all protected subprograms.
7933 if Has_Entries (Prot_Typ) then
7934 Entries_Aggr := Make_Aggregate (Loc, Expressions => New_List);
7936 Entries_Aggr := Empty;
7939 -- Build two new procedure specifications for each protected subprogram;
7940 -- one to call from outside the object and one to call from inside.
7941 -- Build a barrier function and an entry body action procedure
7942 -- specification for each protected entry. Initialize the entry body
7943 -- array. If subprogram is flagged as eliminated, do not generate any
7944 -- internal operations.
7948 Comp := First (Visible_Declarations (Pdef));
7950 while Present (Comp) loop
7951 if Nkind (Comp) = N_Subprogram_Declaration then
7953 Make_Subprogram_Declaration (Loc,
7955 Build_Protected_Sub_Specification
7956 (Comp, Prot_Typ, Unprotected_Mode));
7958 Insert_After (Current_Node, Sub);
7961 Set_Protected_Body_Subprogram
7962 (Defining_Unit_Name (Specification (Comp)),
7963 Defining_Unit_Name (Specification (Sub)));
7964 Check_Inlining (Defining_Unit_Name (Specification (Comp)));
7966 -- Make the protected version of the subprogram available for
7967 -- expansion of external calls.
7969 Current_Node := Sub;
7972 Make_Subprogram_Declaration (Loc,
7974 Build_Protected_Sub_Specification
7975 (Comp, Prot_Typ, Protected_Mode));
7977 Insert_After (Current_Node, Sub);
7980 Current_Node := Sub;
7982 -- Generate an overriding primitive operation specification for
7983 -- this subprogram if the protected type implements an interface.
7985 if Ada_Version >= Ada_05
7987 Present (Interfaces (Corresponding_Record_Type (Prot_Typ)))
7990 Make_Subprogram_Declaration (Loc,
7992 Build_Protected_Sub_Specification
7993 (Comp, Prot_Typ, Dispatching_Mode));
7995 Insert_After (Current_Node, Sub);
7998 Current_Node := Sub;
8001 -- If a pragma Interrupt_Handler applies, build and add a call to
8002 -- Register_Interrupt_Handler to the freezing actions of the
8003 -- protected version (Current_Node) of the subprogram:
8005 -- system.interrupts.register_interrupt_handler
8006 -- (prot_procP'address);
8008 if not Restricted_Profile
8009 and then Is_Interrupt_Handler
8010 (Defining_Unit_Name (Specification (Comp)))
8015 elsif Nkind (Comp) = N_Entry_Declaration then
8016 E_Count := E_Count + 1;
8017 Comp_Id := Defining_Identifier (Comp);
8020 Make_Defining_Identifier (Loc,
8021 Build_Selected_Name (Prot_Typ, Comp_Id, 'E'));
8023 Make_Subprogram_Declaration (Loc,
8025 Build_Protected_Entry_Specification (Loc, Edef, Comp_Id));
8027 Insert_After (Current_Node, Sub);
8030 Set_Protected_Body_Subprogram
8031 (Defining_Identifier (Comp),
8032 Defining_Unit_Name (Specification (Sub)));
8034 Current_Node := Sub;
8037 Make_Defining_Identifier (Loc,
8038 Chars => Build_Selected_Name (Prot_Typ, Comp_Id, 'B'));
8040 Make_Subprogram_Declaration (Loc,
8042 Build_Barrier_Function_Specification (Loc, Bdef));
8044 Insert_After (Current_Node, Sub);
8046 Set_Protected_Body_Subprogram (Bdef, Bdef);
8047 Set_Barrier_Function (Comp_Id, Bdef);
8048 Set_Scope (Bdef, Scope (Comp_Id));
8049 Current_Node := Sub;
8051 -- Collect pointers to the protected subprogram and the barrier
8052 -- of the current entry, for insertion into Entry_Bodies_Array.
8055 Make_Aggregate (Loc,
8056 Expressions => New_List (
8057 Make_Attribute_Reference (Loc,
8058 Prefix => New_Reference_To (Bdef, Loc),
8059 Attribute_Name => Name_Unrestricted_Access),
8060 Make_Attribute_Reference (Loc,
8061 Prefix => New_Reference_To (Edef, Loc),
8062 Attribute_Name => Name_Unrestricted_Access))),
8063 Expressions (Entries_Aggr));
8070 -- If there are some private entry declarations, expand it as if they
8071 -- were visible entries.
8073 if Present (Private_Declarations (Pdef)) then
8074 Comp := First (Private_Declarations (Pdef));
8075 while Present (Comp) loop
8076 if Nkind (Comp) = N_Entry_Declaration then
8077 E_Count := E_Count + 1;
8078 Comp_Id := Defining_Identifier (Comp);
8081 Make_Defining_Identifier (Loc,
8082 Build_Selected_Name (Prot_Typ, Comp_Id, 'E'));
8084 Make_Subprogram_Declaration (Loc,
8086 Build_Protected_Entry_Specification (Loc, Edef, Comp_Id));
8088 Insert_After (Current_Node, Sub);
8091 Set_Protected_Body_Subprogram
8092 (Defining_Identifier (Comp),
8093 Defining_Unit_Name (Specification (Sub)));
8095 Current_Node := Sub;
8098 Make_Defining_Identifier (Loc,
8099 Chars => Build_Selected_Name (Prot_Typ, Comp_Id, 'E'));
8102 Make_Subprogram_Declaration (Loc,
8104 Build_Barrier_Function_Specification (Loc, Bdef));
8106 Insert_After (Current_Node, Sub);
8108 Set_Protected_Body_Subprogram (Bdef, Bdef);
8109 Set_Barrier_Function (Comp_Id, Bdef);
8110 Set_Scope (Bdef, Scope (Comp_Id));
8111 Current_Node := Sub;
8113 -- Collect pointers to the protected subprogram and the barrier
8114 -- of the current entry, for insertion into Entry_Bodies_Array.
8116 Append_To (Expressions (Entries_Aggr),
8117 Make_Aggregate (Loc,
8118 Expressions => New_List (
8119 Make_Attribute_Reference (Loc,
8120 Prefix => New_Reference_To (Bdef, Loc),
8121 Attribute_Name => Name_Unrestricted_Access),
8122 Make_Attribute_Reference (Loc,
8123 Prefix => New_Reference_To (Edef, Loc),
8124 Attribute_Name => Name_Unrestricted_Access))));
8131 -- Emit declaration for Entry_Bodies_Array, now that the addresses of
8132 -- all protected subprograms have been collected.
8134 if Has_Entries (Prot_Typ) then
8136 Make_Defining_Identifier (Sloc (Prot_Typ),
8137 Chars => New_External_Name (Chars (Prot_Typ), 'A'));
8139 case Corresponding_Runtime_Package (Prot_Typ) is
8140 when System_Tasking_Protected_Objects_Entries =>
8141 Body_Arr := Make_Object_Declaration (Loc,
8142 Defining_Identifier => Body_Id,
8143 Aliased_Present => True,
8144 Object_Definition =>
8145 Make_Subtype_Indication (Loc,
8146 Subtype_Mark => New_Reference_To (
8147 RTE (RE_Protected_Entry_Body_Array), Loc),
8149 Make_Index_Or_Discriminant_Constraint (Loc,
8150 Constraints => New_List (
8152 Make_Integer_Literal (Loc, 1),
8153 Make_Integer_Literal (Loc, E_Count))))),
8154 Expression => Entries_Aggr);
8156 when System_Tasking_Protected_Objects_Single_Entry =>
8157 Body_Arr := Make_Object_Declaration (Loc,
8158 Defining_Identifier => Body_Id,
8159 Aliased_Present => True,
8160 Object_Definition => New_Reference_To
8161 (RTE (RE_Entry_Body), Loc),
8163 Make_Aggregate (Loc,
8164 Expressions => New_List (
8165 Make_Attribute_Reference (Loc,
8166 Prefix => New_Reference_To (Bdef, Loc),
8167 Attribute_Name => Name_Unrestricted_Access),
8168 Make_Attribute_Reference (Loc,
8169 Prefix => New_Reference_To (Edef, Loc),
8170 Attribute_Name => Name_Unrestricted_Access))));
8173 raise Program_Error;
8176 -- A pointer to this array will be placed in the corresponding record
8177 -- by its initialization procedure so this needs to be analyzed here.
8179 Insert_After (Current_Node, Body_Arr);
8180 Current_Node := Body_Arr;
8183 Set_Entry_Bodies_Array (Prot_Typ, Body_Id);
8185 -- Finally, build the function that maps an entry index into the
8186 -- corresponding body. A pointer to this function is placed in each
8187 -- object of the type. Except for a ravenscar-like profile (no abort,
8188 -- no entry queue, 1 entry)
8190 if Corresponding_Runtime_Package (Prot_Typ) =
8191 System_Tasking_Protected_Objects_Entries
8194 Make_Subprogram_Declaration (Loc,
8195 Specification => Build_Find_Body_Index_Spec (Prot_Typ));
8196 Insert_After (Current_Node, Sub);
8200 end Expand_N_Protected_Type_Declaration;
8202 --------------------------------
8203 -- Expand_N_Requeue_Statement --
8204 --------------------------------
8206 -- A non-dispatching requeue statement is expanded into one of four GNARLI
8207 -- operations, depending on the source and destination (task or protected
8208 -- object). A dispatching requeue statement is expanded into a call to the
8209 -- predefined primitive _Disp_Requeue. In addition, code is generated to
8210 -- jump around the remainder of processing for the original entry and, if
8211 -- the destination is (different) protected object, to attempt to service
8212 -- it. The following illustrates the various cases:
8215 -- (O : System.Address;
8216 -- P : System.Address;
8217 -- E : Protected_Entry_Index)
8219 -- <discriminant renamings>
8220 -- <private object renamings>
8221 -- type poVP is access poV;
8222 -- _object : ptVP := ptVP!(O);
8226 -- <start of statement sequence for entry>
8228 -- -- Requeue from one protected entry body to another protected
8231 -- Requeue_Protected_Entry (
8232 -- _object._object'Access,
8233 -- new._object'Access,
8238 -- <some more of the statement sequence for entry>
8240 -- -- Requeue from an entry body to a task entry
8242 -- Requeue_Protected_To_Task_Entry (
8248 -- <rest of statement sequence for entry>
8249 -- Complete_Entry_Body (_object._object);
8252 -- when all others =>
8253 -- Exceptional_Complete_Entry_Body (
8254 -- _object._object, Get_GNAT_Exception);
8258 -- Requeue of a task entry call to a task entry
8260 -- Accept_Call (E, Ann);
8261 -- <start of statement sequence for accept statement>
8262 -- Requeue_Task_Entry (New._task_id, E, Abort_Present);
8264 -- <rest of statement sequence for accept statement>
8266 -- Complete_Rendezvous;
8269 -- when all others =>
8270 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
8272 -- Requeue of a task entry call to a protected entry
8274 -- Accept_Call (E, Ann);
8275 -- <start of statement sequence for accept statement>
8276 -- Requeue_Task_To_Protected_Entry (
8277 -- new._object'Access,
8282 -- <rest of statement sequence for accept statement>
8284 -- Complete_Rendezvous;
8287 -- when all others =>
8288 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
8290 -- Ada 2005 (AI05-0030): Dispatching requeue from protected to interface
8294 -- (O : System.Address;
8295 -- P : System.Address;
8296 -- E : Protected_Entry_Index)
8298 -- <discriminant renamings>
8299 -- <private object renamings>
8300 -- type poVP is access poV;
8301 -- _object : ptVP := ptVP!(O);
8305 -- <start of statement sequence for entry>
8308 -- (<interface class-wide object>,
8311 -- Ada.Tags.Get_Offset_Index
8313 -- <interface dispatch table index of target entry>),
8317 -- <rest of statement sequence for entry>
8318 -- Complete_Entry_Body (_object._object);
8321 -- when all others =>
8322 -- Exceptional_Complete_Entry_Body (
8323 -- _object._object, Get_GNAT_Exception);
8327 -- Ada 2005 (AI05-0030): Dispatching requeue from task to interface
8330 -- Accept_Call (E, Ann);
8331 -- <start of statement sequence for accept statement>
8333 -- (<interface class-wide object>,
8336 -- Ada.Tags.Get_Offset_Index
8338 -- <interface dispatch table index of target entrt>),
8342 -- <rest of statement sequence for accept statement>
8344 -- Complete_Rendezvous;
8347 -- when all others =>
8348 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
8350 -- Further details on these expansions can be found in Expand_N_Protected_
8351 -- Body and Expand_N_Accept_Statement.
8353 procedure Expand_N_Requeue_Statement (N : Node_Id) is
8354 Loc : constant Source_Ptr := Sloc (N);
8355 Abortable : Node_Id;
8357 Conc_Typ : Entity_Id;
8362 New_Param : Node_Id;
8363 Old_Typ : Entity_Id;
8366 RTS_Call : Entity_Id;
8367 Self_Param : Node_Id;
8368 Skip_Stat : Node_Id;
8372 New_Occurrence_Of (Boolean_Literals (Abort_Present (N)), Loc);
8374 -- Extract the components of the entry call
8376 Extract_Entry (N, Concval, Ename, Index);
8377 Conc_Typ := Etype (Concval);
8379 -- Examine the scope stack in order to find nearest enclosing protected
8380 -- or task type. This will constitute our invocation source.
8382 Old_Typ := Current_Scope;
8383 while Present (Old_Typ)
8384 and then not Is_Protected_Type (Old_Typ)
8385 and then not Is_Task_Type (Old_Typ)
8387 Old_Typ := Scope (Old_Typ);
8390 -- Generate the parameter list for all cases. The abortable flag is
8391 -- common among dispatching and regular requeue.
8393 Params := New_List (Abortable);
8395 -- Ada 2005 (AI05-0030): We have a dispatching requeue of the form
8396 -- Concval.Ename where the type of Concval is class-wide concurrent
8399 if Ada_Version >= Ada_05
8400 and then Present (Concval)
8401 and then Is_Class_Wide_Type (Conc_Typ)
8402 and then Is_Concurrent_Interface (Conc_Typ)
8404 RTS_Call := Make_Identifier (Loc, Name_uDisp_Requeue);
8407 -- Ada.Tags.Get_Offset_Index
8408 -- (Ada.Tags.Tag (Concval),
8409 -- <interface dispatch table position of Ename>)
8412 Make_Function_Call (Loc,
8414 New_Reference_To (RTE (RE_Get_Offset_Index), Loc),
8415 Parameter_Associations =>
8417 Unchecked_Convert_To (RTE (RE_Tag), Concval),
8418 Make_Integer_Literal (Loc, DT_Position (Entity (Ename))))));
8420 -- Specific actuals for protected to interface class-wide type
8423 if Is_Protected_Type (Old_Typ) then
8425 Make_Attribute_Reference (Loc, -- _object'Address
8427 Concurrent_Ref (New_Occurrence_Of (Old_Typ, Loc)),
8430 Prepend_To (Params, -- True
8431 New_Reference_To (Standard_True, Loc));
8433 -- Specific actuals for task to interface class-wide type requeue
8436 pragma Assert (Is_Task_Type (Old_Typ));
8438 Prepend_To (Params, -- null
8439 New_Reference_To (RTE (RE_Null_Address), Loc));
8440 Prepend_To (Params, -- False
8441 New_Reference_To (Standard_False, Loc));
8444 -- Finally, add the common object parameter
8446 Prepend_To (Params, New_Copy_Tree (Concval));
8448 -- Regular requeue processing
8451 New_Param := Concurrent_Ref (Concval);
8453 -- The index expression is common among all four cases
8456 Entry_Index_Expression (Loc, Entity (Ename), Index, Conc_Typ));
8458 if Is_Protected_Type (Old_Typ) then
8460 Make_Attribute_Reference (Loc,
8462 Concurrent_Ref (New_Occurrence_Of (Old_Typ, Loc)),
8464 Name_Unchecked_Access);
8466 -- Protected to protected requeue
8468 if Is_Protected_Type (Conc_Typ) then
8470 New_Reference_To (RTE (RE_Requeue_Protected_Entry), Loc);
8473 Make_Attribute_Reference (Loc,
8477 Name_Unchecked_Access);
8479 -- Protected to task requeue
8482 pragma Assert (Is_Task_Type (Conc_Typ));
8485 RTE (RE_Requeue_Protected_To_Task_Entry), Loc);
8488 Prepend (New_Param, Params);
8489 Prepend (Self_Param, Params);
8492 pragma Assert (Is_Task_Type (Old_Typ));
8494 -- Task to protected requeue
8496 if Is_Protected_Type (Conc_Typ) then
8499 RTE (RE_Requeue_Task_To_Protected_Entry), Loc);
8502 Make_Attribute_Reference (Loc,
8506 Name_Unchecked_Access);
8508 -- Task to task requeue
8511 pragma Assert (Is_Task_Type (Conc_Typ));
8513 New_Reference_To (RTE (RE_Requeue_Task_Entry), Loc);
8516 Prepend (New_Param, Params);
8520 -- Create the GNARLI or predefined primitive call
8523 Make_Procedure_Call_Statement (Loc,
8525 Parameter_Associations => Params);
8530 if Is_Protected_Type (Old_Typ) then
8532 -- Build the return statement to skip the rest of the entry body
8534 Skip_Stat := Make_Simple_Return_Statement (Loc);
8537 -- If the requeue is within a task, find the end label of the
8538 -- enclosing accept statement.
8540 Acc_Stat := Parent (N);
8541 while Nkind (Acc_Stat) /= N_Accept_Statement loop
8542 Acc_Stat := Parent (Acc_Stat);
8545 -- The last statement is the second label, used for completing the
8546 -- rendezvous the usual way. The label we are looking for is right
8550 Prev (Last (Statements (Handled_Statement_Sequence (Acc_Stat))));
8552 pragma Assert (Nkind (Lab_Node) = N_Label);
8554 -- Build the goto statement to skip the rest of the accept
8558 Make_Goto_Statement (Loc,
8559 Name => New_Occurrence_Of (Entity (Identifier (Lab_Node)), Loc));
8562 Set_Analyzed (Skip_Stat);
8564 Insert_After (N, Skip_Stat);
8565 end Expand_N_Requeue_Statement;
8567 -------------------------------
8568 -- Expand_N_Selective_Accept --
8569 -------------------------------
8571 procedure Expand_N_Selective_Accept (N : Node_Id) is
8572 Loc : constant Source_Ptr := Sloc (N);
8573 Alts : constant List_Id := Select_Alternatives (N);
8575 -- Note: in the below declarations a lot of new lists are allocated
8576 -- unconditionally which may well not end up being used. That's
8577 -- not a good idea since it wastes space gratuitously ???
8579 Accept_Case : List_Id;
8580 Accept_List : constant List_Id := New_List;
8583 Alt_List : constant List_Id := New_List;
8584 Alt_Stats : List_Id;
8585 Ann : Entity_Id := Empty;
8588 Check_Guard : Boolean := True;
8590 Decls : constant List_Id := New_List;
8591 Stats : constant List_Id := New_List;
8592 Body_List : constant List_Id := New_List;
8593 Trailing_List : constant List_Id := New_List;
8596 Else_Present : Boolean := False;
8597 Terminate_Alt : Node_Id := Empty;
8598 Select_Mode : Node_Id;
8600 Delay_Case : List_Id;
8601 Delay_Count : Integer := 0;
8602 Delay_Val : Entity_Id;
8603 Delay_Index : Entity_Id;
8604 Delay_Min : Entity_Id;
8605 Delay_Num : Int := 1;
8606 Delay_Alt_List : List_Id := New_List;
8607 Delay_List : constant List_Id := New_List;
8611 First_Delay : Boolean := True;
8612 Guard_Open : Entity_Id;
8618 Num_Accept : Nat := 0;
8621 Time_Type : Entity_Id;
8623 Select_Call : Node_Id;
8625 Qnam : constant Entity_Id :=
8626 Make_Defining_Identifier (Loc, New_External_Name ('S', 0));
8628 Xnam : constant Entity_Id :=
8629 Make_Defining_Identifier (Loc, New_External_Name ('J', 1));
8631 -----------------------
8632 -- Local subprograms --
8633 -----------------------
8635 function Accept_Or_Raise return List_Id;
8636 -- For the rare case where delay alternatives all have guards, and
8637 -- all of them are closed, it is still possible that there were open
8638 -- accept alternatives with no callers. We must reexamine the
8639 -- Accept_List, and execute a selective wait with no else if some
8640 -- accept is open. If none, we raise program_error.
8642 procedure Add_Accept (Alt : Node_Id);
8643 -- Process a single accept statement in a select alternative. Build
8644 -- procedure for body of accept, and add entry to dispatch table with
8645 -- expression for guard, in preparation for call to run time select.
8647 function Make_And_Declare_Label (Num : Int) return Node_Id;
8648 -- Manufacture a label using Num as a serial number and declare it.
8649 -- The declaration is appended to Decls. The label marks the trailing
8650 -- statements of an accept or delay alternative.
8652 function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id;
8653 -- Build call to Selective_Wait runtime routine
8655 procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int);
8656 -- Add code to compare value of delay with previous values, and
8657 -- generate case entry for trailing statements.
8659 procedure Process_Accept_Alternative
8663 -- Add code to call corresponding procedure, and branch to
8664 -- trailing statements, if any.
8666 ---------------------
8667 -- Accept_Or_Raise --
8668 ---------------------
8670 function Accept_Or_Raise return List_Id is
8673 J : constant Entity_Id := Make_Defining_Identifier (Loc,
8674 New_Internal_Name ('J'));
8677 -- We generate the following:
8679 -- for J in q'range loop
8680 -- if q(J).S /=null_task_entry then
8681 -- selective_wait (simple_mode,...);
8687 -- if no rendez_vous then
8688 -- raise program_error;
8691 -- Note that the code needs to know that the selector name
8692 -- in an Accept_Alternative is named S.
8694 Cond := Make_Op_Ne (Loc,
8696 Make_Selected_Component (Loc,
8697 Prefix => Make_Indexed_Component (Loc,
8698 Prefix => New_Reference_To (Qnam, Loc),
8699 Expressions => New_List (New_Reference_To (J, Loc))),
8700 Selector_Name => Make_Identifier (Loc, Name_S)),
8702 New_Reference_To (RTE (RE_Null_Task_Entry), Loc));
8705 Make_Implicit_Loop_Statement (N,
8706 Identifier => Empty,
8708 Make_Iteration_Scheme (Loc,
8709 Loop_Parameter_Specification =>
8710 Make_Loop_Parameter_Specification (Loc,
8711 Defining_Identifier => J,
8712 Discrete_Subtype_Definition =>
8713 Make_Attribute_Reference (Loc,
8714 Prefix => New_Reference_To (Qnam, Loc),
8715 Attribute_Name => Name_Range,
8716 Expressions => New_List (
8717 Make_Integer_Literal (Loc, 1))))),
8719 Statements => New_List (
8720 Make_Implicit_If_Statement (N,
8722 Then_Statements => New_List (
8724 New_Reference_To (RTE (RE_Simple_Mode), Loc)),
8725 Make_Exit_Statement (Loc))))));
8728 Make_Raise_Program_Error (Loc,
8729 Condition => Make_Op_Eq (Loc,
8730 Left_Opnd => New_Reference_To (Xnam, Loc),
8732 New_Reference_To (RTE (RE_No_Rendezvous), Loc)),
8733 Reason => PE_All_Guards_Closed));
8736 end Accept_Or_Raise;
8742 procedure Add_Accept (Alt : Node_Id) is
8743 Acc_Stm : constant Node_Id := Accept_Statement (Alt);
8744 Ename : constant Node_Id := Entry_Direct_Name (Acc_Stm);
8745 Eloc : constant Source_Ptr := Sloc (Ename);
8746 Eent : constant Entity_Id := Entity (Ename);
8747 Index : constant Node_Id := Entry_Index (Acc_Stm);
8748 Null_Body : Node_Id;
8749 Proc_Body : Node_Id;
8756 Ann := Node (Last_Elmt (Accept_Address (Eent)));
8759 if Present (Condition (Alt)) then
8761 Make_Conditional_Expression (Eloc, New_List (
8763 Entry_Index_Expression (Eloc, Eent, Index, Scope (Eent)),
8764 New_Reference_To (RTE (RE_Null_Task_Entry), Eloc)));
8767 Entry_Index_Expression
8768 (Eloc, Eent, Index, Scope (Eent));
8771 if Present (Handled_Statement_Sequence (Accept_Statement (Alt))) then
8772 Null_Body := New_Reference_To (Standard_False, Eloc);
8774 if Abort_Allowed then
8775 Call := Make_Procedure_Call_Statement (Eloc,
8776 Name => New_Reference_To (RTE (RE_Abort_Undefer), Eloc));
8777 Insert_Before (First (Statements (Handled_Statement_Sequence (
8778 Accept_Statement (Alt)))), Call);
8783 Make_Defining_Identifier (Eloc,
8784 New_External_Name (Chars (Ename), 'A', Num_Accept));
8786 if Comes_From_Source (Alt) then
8787 Set_Debug_Info_Needed (PB_Ent);
8791 Make_Subprogram_Body (Eloc,
8793 Make_Procedure_Specification (Eloc,
8794 Defining_Unit_Name => PB_Ent),
8795 Declarations => Declarations (Acc_Stm),
8796 Handled_Statement_Sequence =>
8797 Build_Accept_Body (Accept_Statement (Alt)));
8799 -- During the analysis of the body of the accept statement, any
8800 -- zero cost exception handler records were collected in the
8801 -- Accept_Handler_Records field of the N_Accept_Alternative node.
8802 -- This is where we move them to where they belong, namely the
8803 -- newly created procedure.
8805 Set_Handler_Records (PB_Ent, Accept_Handler_Records (Alt));
8806 Append (Proc_Body, Body_List);
8809 Null_Body := New_Reference_To (Standard_True, Eloc);
8811 -- if accept statement has declarations, insert above, given that
8812 -- we are not creating a body for the accept.
8814 if Present (Declarations (Acc_Stm)) then
8815 Insert_Actions (N, Declarations (Acc_Stm));
8819 Append_To (Accept_List,
8820 Make_Aggregate (Eloc, Expressions => New_List (Null_Body, Expr)));
8822 Num_Accept := Num_Accept + 1;
8825 ----------------------------
8826 -- Make_And_Declare_Label --
8827 ----------------------------
8829 function Make_And_Declare_Label (Num : Int) return Node_Id is
8833 Lab_Id := Make_Identifier (Loc, New_External_Name ('L', Num));
8835 Make_Label (Loc, Lab_Id);
8838 Make_Implicit_Label_Declaration (Loc,
8839 Defining_Identifier =>
8840 Make_Defining_Identifier (Loc, Chars (Lab_Id)),
8841 Label_Construct => Lab));
8844 end Make_And_Declare_Label;
8846 ----------------------
8847 -- Make_Select_Call --
8848 ----------------------
8850 function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id is
8851 Params : constant List_Id := New_List;
8855 Make_Attribute_Reference (Loc,
8856 Prefix => New_Reference_To (Qnam, Loc),
8857 Attribute_Name => Name_Unchecked_Access),
8859 Append (Select_Mode, Params);
8860 Append (New_Reference_To (Ann, Loc), Params);
8861 Append (New_Reference_To (Xnam, Loc), Params);
8864 Make_Procedure_Call_Statement (Loc,
8865 Name => New_Reference_To (RTE (RE_Selective_Wait), Loc),
8866 Parameter_Associations => Params);
8867 end Make_Select_Call;
8869 --------------------------------
8870 -- Process_Accept_Alternative --
8871 --------------------------------
8873 procedure Process_Accept_Alternative
8878 Choices : List_Id := No_List;
8879 Alt_Stats : List_Id;
8882 Adjust_Condition (Condition (Alt));
8883 Alt_Stats := No_List;
8885 if Present (Handled_Statement_Sequence (Accept_Statement (Alt))) then
8886 Choices := New_List (
8887 Make_Integer_Literal (Loc, Index));
8889 Alt_Stats := New_List (
8890 Make_Procedure_Call_Statement (Sloc (Proc),
8891 Name => New_Reference_To (
8892 Defining_Unit_Name (Specification (Proc)), Sloc (Proc))));
8895 if Statements (Alt) /= Empty_List then
8897 if No (Alt_Stats) then
8899 -- Accept with no body, followed by trailing statements
8901 Choices := New_List (
8902 Make_Integer_Literal (Loc, Index));
8904 Alt_Stats := New_List;
8907 -- After the call, if any, branch to trailing statements. We
8908 -- create a label for each, as well as the corresponding label
8911 Lab := Make_And_Declare_Label (Index);
8912 Append_To (Alt_Stats,
8913 Make_Goto_Statement (Loc,
8914 Name => New_Copy (Identifier (Lab))));
8916 Append (Lab, Trailing_List);
8917 Append_List (Statements (Alt), Trailing_List);
8918 Append_To (Trailing_List,
8919 Make_Goto_Statement (Loc,
8920 Name => New_Copy (Identifier (End_Lab))));
8923 if Present (Alt_Stats) then
8925 -- Procedure call. and/or trailing statements
8927 Append_To (Alt_List,
8928 Make_Case_Statement_Alternative (Loc,
8929 Discrete_Choices => Choices,
8930 Statements => Alt_Stats));
8932 end Process_Accept_Alternative;
8934 -------------------------------
8935 -- Process_Delay_Alternative --
8936 -------------------------------
8938 procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int) is
8941 Delay_Alt : List_Id;
8944 -- Deal with C/Fortran boolean as delay condition
8946 Adjust_Condition (Condition (Alt));
8948 -- Determine the smallest specified delay
8950 -- for each delay alternative generate:
8952 -- if guard-expression then
8953 -- Delay_Val := delay-expression;
8954 -- Guard_Open := True;
8955 -- if Delay_Val < Delay_Min then
8956 -- Delay_Min := Delay_Val;
8957 -- Delay_Index := Index;
8961 -- The enclosing if-statement is omitted if there is no guard
8966 First_Delay := False;
8968 Delay_Alt := New_List (
8969 Make_Assignment_Statement (Loc,
8970 Name => New_Reference_To (Delay_Min, Loc),
8971 Expression => Expression (Delay_Statement (Alt))));
8973 if Delay_Count > 1 then
8974 Append_To (Delay_Alt,
8975 Make_Assignment_Statement (Loc,
8976 Name => New_Reference_To (Delay_Index, Loc),
8977 Expression => Make_Integer_Literal (Loc, Index)));
8981 Delay_Alt := New_List (
8982 Make_Assignment_Statement (Loc,
8983 Name => New_Reference_To (Delay_Val, Loc),
8984 Expression => Expression (Delay_Statement (Alt))));
8986 if Time_Type = Standard_Duration then
8989 Left_Opnd => New_Reference_To (Delay_Val, Loc),
8990 Right_Opnd => New_Reference_To (Delay_Min, Loc));
8993 -- The scope of the time type must define a comparison
8994 -- operator. The scope itself may not be visible, so we
8995 -- construct a node with entity information to insure that
8996 -- semantic analysis can find the proper operator.
8999 Make_Function_Call (Loc,
9000 Name => Make_Selected_Component (Loc,
9001 Prefix => New_Reference_To (Scope (Time_Type), Loc),
9003 Make_Operator_Symbol (Loc,
9004 Chars => Name_Op_Lt,
9005 Strval => No_String)),
9006 Parameter_Associations =>
9008 New_Reference_To (Delay_Val, Loc),
9009 New_Reference_To (Delay_Min, Loc)));
9011 Set_Entity (Prefix (Name (Cond)), Scope (Time_Type));
9014 Append_To (Delay_Alt,
9015 Make_Implicit_If_Statement (N,
9017 Then_Statements => New_List (
9018 Make_Assignment_Statement (Loc,
9019 Name => New_Reference_To (Delay_Min, Loc),
9020 Expression => New_Reference_To (Delay_Val, Loc)),
9022 Make_Assignment_Statement (Loc,
9023 Name => New_Reference_To (Delay_Index, Loc),
9024 Expression => Make_Integer_Literal (Loc, Index)))));
9028 Append_To (Delay_Alt,
9029 Make_Assignment_Statement (Loc,
9030 Name => New_Reference_To (Guard_Open, Loc),
9031 Expression => New_Reference_To (Standard_True, Loc)));
9034 if Present (Condition (Alt)) then
9035 Delay_Alt := New_List (
9036 Make_Implicit_If_Statement (N,
9037 Condition => Condition (Alt),
9038 Then_Statements => Delay_Alt));
9041 Append_List (Delay_Alt, Delay_List);
9043 -- If the delay alternative has a statement part, add choice to the
9044 -- case statements for delays.
9046 if Present (Statements (Alt)) then
9048 if Delay_Count = 1 then
9049 Append_List (Statements (Alt), Delay_Alt_List);
9052 Choices := New_List (
9053 Make_Integer_Literal (Loc, Index));
9055 Append_To (Delay_Alt_List,
9056 Make_Case_Statement_Alternative (Loc,
9057 Discrete_Choices => Choices,
9058 Statements => Statements (Alt)));
9061 elsif Delay_Count = 1 then
9063 -- If the single delay has no trailing statements, add a branch
9064 -- to the exit label to the selective wait.
9066 Delay_Alt_List := New_List (
9067 Make_Goto_Statement (Loc,
9068 Name => New_Copy (Identifier (End_Lab))));
9071 end Process_Delay_Alternative;
9073 -- Start of processing for Expand_N_Selective_Accept
9076 -- First insert some declarations before the select. The first is:
9080 -- This variable holds the parameters passed to the accept body. This
9081 -- declaration has already been inserted by the time we get here by
9082 -- a call to Expand_Accept_Declarations made from the semantics when
9083 -- processing the first accept statement contained in the select. We
9084 -- can find this entity as Accept_Address (E), where E is any of the
9085 -- entries references by contained accept statements.
9087 -- The first step is to scan the list of Selective_Accept_Statements
9088 -- to find this entity, and also count the number of accepts, and
9089 -- determine if terminated, delay or else is present:
9093 Alt := First (Alts);
9094 while Present (Alt) loop
9096 if Nkind (Alt) = N_Accept_Alternative then
9099 elsif Nkind (Alt) = N_Delay_Alternative then
9100 Delay_Count := Delay_Count + 1;
9102 -- If the delays are relative delays, the delay expressions have
9103 -- type Standard_Duration. Otherwise they must have some time type
9104 -- recognized by GNAT.
9106 if Nkind (Delay_Statement (Alt)) = N_Delay_Relative_Statement then
9107 Time_Type := Standard_Duration;
9109 Time_Type := Etype (Expression (Delay_Statement (Alt)));
9111 if Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time)
9112 or else Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time)
9117 "& is not a time type (RM 9.6(6))",
9118 Expression (Delay_Statement (Alt)), Time_Type);
9119 Time_Type := Standard_Duration;
9120 Set_Etype (Expression (Delay_Statement (Alt)), Any_Type);
9124 if No (Condition (Alt)) then
9126 -- This guard will always be open
9128 Check_Guard := False;
9131 elsif Nkind (Alt) = N_Terminate_Alternative then
9132 Adjust_Condition (Condition (Alt));
9133 Terminate_Alt := Alt;
9136 Num_Alts := Num_Alts + 1;
9140 Else_Present := Present (Else_Statements (N));
9142 -- At the same time (see procedure Add_Accept) we build the accept list:
9144 -- Qnn : Accept_List (1 .. num-select) := (
9145 -- (null-body, entry-index),
9146 -- (null-body, entry-index),
9148 -- (null_body, entry-index));
9150 -- In the above declaration, null-body is True if the corresponding
9151 -- accept has no body, and false otherwise. The entry is either the
9152 -- entry index expression if there is no guard, or if a guard is
9153 -- present, then a conditional expression of the form:
9155 -- (if guard then entry-index else Null_Task_Entry)
9157 -- If a guard is statically known to be false, the entry can simply
9158 -- be omitted from the accept list.
9161 Make_Object_Declaration (Loc,
9162 Defining_Identifier => Qnam,
9163 Object_Definition =>
9164 New_Reference_To (RTE (RE_Accept_List), Loc),
9165 Aliased_Present => True,
9168 Make_Qualified_Expression (Loc,
9170 New_Reference_To (RTE (RE_Accept_List), Loc),
9172 Make_Aggregate (Loc, Expressions => Accept_List)));
9176 -- Then we declare the variable that holds the index for the accept
9177 -- that will be selected for service:
9179 -- Xnn : Select_Index;
9182 Make_Object_Declaration (Loc,
9183 Defining_Identifier => Xnam,
9184 Object_Definition =>
9185 New_Reference_To (RTE (RE_Select_Index), Loc),
9187 New_Reference_To (RTE (RE_No_Rendezvous), Loc));
9191 -- After this follow procedure declarations for each accept body
9198 -- where the ... are statements from the corresponding procedure body.
9199 -- No parameters are involved, since the parameters are passed via Ann
9200 -- and the parameter references have already been expanded to be direct
9201 -- references to Ann (see Exp_Ch2.Expand_Entry_Parameter). Furthermore,
9202 -- any embedded tasking statements (which would normally be illegal in
9203 -- procedures), have been converted to calls to the tasking runtime so
9204 -- there is no problem in putting them into procedures.
9206 -- The original accept statement has been expanded into a block in
9207 -- the same fashion as for simple accepts (see Build_Accept_Body).
9209 -- Note: we don't really need to build these procedures for the case
9210 -- where no delay statement is present, but it is just as easy to
9211 -- build them unconditionally, and not significantly inefficient,
9212 -- since if they are short they will be inlined anyway.
9214 -- The procedure declarations have been assembled in Body_List
9216 -- If delays are present, we must compute the required delay.
9217 -- We first generate the declarations:
9219 -- Delay_Index : Boolean := 0;
9220 -- Delay_Min : Some_Time_Type.Time;
9221 -- Delay_Val : Some_Time_Type.Time;
9223 -- Delay_Index will be set to the index of the minimum delay, i.e. the
9224 -- active delay that is actually chosen as the basis for the possible
9225 -- delay if an immediate rendez-vous is not possible.
9227 -- In the most common case there is a single delay statement, and this
9228 -- is handled specially.
9230 if Delay_Count > 0 then
9232 -- Generate the required declarations
9235 Make_Defining_Identifier (Loc, New_External_Name ('D', 1));
9237 Make_Defining_Identifier (Loc, New_External_Name ('D', 2));
9239 Make_Defining_Identifier (Loc, New_External_Name ('D', 3));
9242 Make_Object_Declaration (Loc,
9243 Defining_Identifier => Delay_Val,
9244 Object_Definition => New_Reference_To (Time_Type, Loc)));
9247 Make_Object_Declaration (Loc,
9248 Defining_Identifier => Delay_Index,
9249 Object_Definition => New_Reference_To (Standard_Integer, Loc),
9250 Expression => Make_Integer_Literal (Loc, 0)));
9253 Make_Object_Declaration (Loc,
9254 Defining_Identifier => Delay_Min,
9255 Object_Definition => New_Reference_To (Time_Type, Loc),
9257 Unchecked_Convert_To (Time_Type,
9258 Make_Attribute_Reference (Loc,
9260 New_Occurrence_Of (Underlying_Type (Time_Type), Loc),
9261 Attribute_Name => Name_Last))));
9263 -- Create Duration and Delay_Mode objects used for passing a delay
9266 D := Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
9267 M := Make_Defining_Identifier (Loc, New_Internal_Name ('M'));
9273 -- Note that these values are defined in s-osprim.ads and must
9276 -- Relative : constant := 0;
9277 -- Absolute_Calendar : constant := 1;
9278 -- Absolute_RT : constant := 2;
9280 if Time_Type = Standard_Duration then
9281 Discr := Make_Integer_Literal (Loc, 0);
9283 elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
9284 Discr := Make_Integer_Literal (Loc, 1);
9288 (Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
9289 Discr := Make_Integer_Literal (Loc, 2);
9293 Make_Object_Declaration (Loc,
9294 Defining_Identifier => D,
9295 Object_Definition =>
9296 New_Reference_To (Standard_Duration, Loc)));
9299 Make_Object_Declaration (Loc,
9300 Defining_Identifier => M,
9301 Object_Definition =>
9302 New_Reference_To (Standard_Integer, Loc),
9303 Expression => Discr));
9308 Make_Defining_Identifier (Loc, New_External_Name ('G', 1));
9311 Make_Object_Declaration (Loc,
9312 Defining_Identifier => Guard_Open,
9313 Object_Definition => New_Reference_To (Standard_Boolean, Loc),
9314 Expression => New_Reference_To (Standard_False, Loc)));
9317 -- Delay_Count is zero, don't need M and D set (suppress warning)
9324 if Present (Terminate_Alt) then
9326 -- If the terminate alternative guard is False, use
9327 -- Simple_Mode; otherwise use Terminate_Mode.
9329 if Present (Condition (Terminate_Alt)) then
9330 Select_Mode := Make_Conditional_Expression (Loc,
9331 New_List (Condition (Terminate_Alt),
9332 New_Reference_To (RTE (RE_Terminate_Mode), Loc),
9333 New_Reference_To (RTE (RE_Simple_Mode), Loc)));
9335 Select_Mode := New_Reference_To (RTE (RE_Terminate_Mode), Loc);
9338 elsif Else_Present or Delay_Count > 0 then
9339 Select_Mode := New_Reference_To (RTE (RE_Else_Mode), Loc);
9342 Select_Mode := New_Reference_To (RTE (RE_Simple_Mode), Loc);
9345 Select_Call := Make_Select_Call (Select_Mode);
9346 Append (Select_Call, Stats);
9348 -- Now generate code to act on the result. There is an entry
9349 -- in this case for each accept statement with a non-null body,
9350 -- followed by a branch to the statements that follow the Accept.
9351 -- In the absence of delay alternatives, we generate:
9354 -- when No_Rendezvous => -- omitted if simple mode
9369 -- Lab0: Else_Statements;
9372 -- Lab1: Trailing_Statements1;
9375 -- Lab2: Trailing_Statements2;
9380 -- Generate label for common exit
9382 End_Lab := Make_And_Declare_Label (Num_Alts + 1);
9384 -- First entry is the default case, when no rendezvous is possible
9386 Choices := New_List (New_Reference_To (RTE (RE_No_Rendezvous), Loc));
9388 if Else_Present then
9390 -- If no rendezvous is possible, the else part is executed
9392 Lab := Make_And_Declare_Label (0);
9393 Alt_Stats := New_List (
9394 Make_Goto_Statement (Loc,
9395 Name => New_Copy (Identifier (Lab))));
9397 Append (Lab, Trailing_List);
9398 Append_List (Else_Statements (N), Trailing_List);
9399 Append_To (Trailing_List,
9400 Make_Goto_Statement (Loc,
9401 Name => New_Copy (Identifier (End_Lab))));
9403 Alt_Stats := New_List (
9404 Make_Goto_Statement (Loc,
9405 Name => New_Copy (Identifier (End_Lab))));
9408 Append_To (Alt_List,
9409 Make_Case_Statement_Alternative (Loc,
9410 Discrete_Choices => Choices,
9411 Statements => Alt_Stats));
9413 -- We make use of the fact that Accept_Index is an integer type, and
9414 -- generate successive literals for entries for each accept. Only those
9415 -- for which there is a body or trailing statements get a case entry.
9417 Alt := First (Select_Alternatives (N));
9418 Proc := First (Body_List);
9419 while Present (Alt) loop
9421 if Nkind (Alt) = N_Accept_Alternative then
9422 Process_Accept_Alternative (Alt, Index, Proc);
9426 (Handled_Statement_Sequence (Accept_Statement (Alt)))
9431 elsif Nkind (Alt) = N_Delay_Alternative then
9432 Process_Delay_Alternative (Alt, Delay_Num);
9433 Delay_Num := Delay_Num + 1;
9439 -- An others choice is always added to the main case, as well
9440 -- as the delay case (to satisfy the compiler).
9442 Append_To (Alt_List,
9443 Make_Case_Statement_Alternative (Loc,
9445 New_List (Make_Others_Choice (Loc)),
9447 New_List (Make_Goto_Statement (Loc,
9448 Name => New_Copy (Identifier (End_Lab))))));
9450 Accept_Case := New_List (
9451 Make_Case_Statement (Loc,
9452 Expression => New_Reference_To (Xnam, Loc),
9453 Alternatives => Alt_List));
9455 Append_List (Trailing_List, Accept_Case);
9456 Append (End_Lab, Accept_Case);
9457 Append_List (Body_List, Decls);
9459 -- Construct case statement for trailing statements of delay
9460 -- alternatives, if there are several of them.
9462 if Delay_Count > 1 then
9463 Append_To (Delay_Alt_List,
9464 Make_Case_Statement_Alternative (Loc,
9466 New_List (Make_Others_Choice (Loc)),
9468 New_List (Make_Null_Statement (Loc))));
9470 Delay_Case := New_List (
9471 Make_Case_Statement (Loc,
9472 Expression => New_Reference_To (Delay_Index, Loc),
9473 Alternatives => Delay_Alt_List));
9475 Delay_Case := Delay_Alt_List;
9478 -- If there are no delay alternatives, we append the case statement
9479 -- to the statement list.
9481 if Delay_Count = 0 then
9482 Append_List (Accept_Case, Stats);
9484 -- Delay alternatives present
9487 -- If delay alternatives are present we generate:
9489 -- find minimum delay.
9490 -- DX := minimum delay;
9491 -- M := <delay mode>;
9492 -- Timed_Selective_Wait (Q'Unchecked_Access, Delay_Mode, P,
9495 -- if X = No_Rendezvous then
9496 -- case statement for delay statements.
9498 -- case statement for accept alternatives.
9509 -- The type of the delay expression is known to be legal
9511 if Time_Type = Standard_Duration then
9512 Conv := New_Reference_To (Delay_Min, Loc);
9514 elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
9515 Conv := Make_Function_Call (Loc,
9516 New_Reference_To (RTE (RO_CA_To_Duration), Loc),
9517 New_List (New_Reference_To (Delay_Min, Loc)));
9521 (Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
9523 Conv := Make_Function_Call (Loc,
9524 New_Reference_To (RTE (RO_RT_To_Duration), Loc),
9525 New_List (New_Reference_To (Delay_Min, Loc)));
9528 Stmt := Make_Assignment_Statement (Loc,
9529 Name => New_Reference_To (D, Loc),
9530 Expression => Conv);
9532 -- Change the value for Accept_Modes. (Else_Mode -> Delay_Mode)
9534 Parms := Parameter_Associations (Select_Call);
9535 Parm := First (Parms);
9537 while Present (Parm)
9538 and then Parm /= Select_Mode
9543 pragma Assert (Present (Parm));
9544 Rewrite (Parm, New_Reference_To (RTE (RE_Delay_Mode), Loc));
9547 -- Prepare two new parameters of Duration and Delay_Mode type
9548 -- which represent the value and the mode of the minimum delay.
9551 Insert_After (Parm, New_Reference_To (M, Loc));
9552 Insert_After (Parm, New_Reference_To (D, Loc));
9554 -- Create a call to RTS
9556 Rewrite (Select_Call,
9557 Make_Procedure_Call_Statement (Loc,
9558 Name => New_Reference_To (RTE (RE_Timed_Selective_Wait), Loc),
9559 Parameter_Associations => Parms));
9561 -- This new call should follow the calculation of the minimum
9564 Insert_List_Before (Select_Call, Delay_List);
9568 Make_Implicit_If_Statement (N,
9569 Condition => New_Reference_To (Guard_Open, Loc),
9571 New_List (New_Copy_Tree (Stmt),
9572 New_Copy_Tree (Select_Call)),
9573 Else_Statements => Accept_Or_Raise);
9574 Rewrite (Select_Call, Stmt);
9576 Insert_Before (Select_Call, Stmt);
9580 Make_Implicit_If_Statement (N,
9581 Condition => Make_Op_Eq (Loc,
9582 Left_Opnd => New_Reference_To (Xnam, Loc),
9584 New_Reference_To (RTE (RE_No_Rendezvous), Loc)),
9586 Then_Statements => Delay_Case,
9587 Else_Statements => Accept_Case);
9589 Append (Cases, Stats);
9593 -- Replace accept statement with appropriate block
9596 Make_Block_Statement (Loc,
9597 Declarations => Decls,
9598 Handled_Statement_Sequence =>
9599 Make_Handled_Sequence_Of_Statements (Loc,
9600 Statements => Stats));
9605 -- Note: have to worry more about abort deferral in above code ???
9607 -- Final step is to unstack the Accept_Address entries for all accept
9608 -- statements appearing in accept alternatives in the select statement
9610 Alt := First (Alts);
9611 while Present (Alt) loop
9612 if Nkind (Alt) = N_Accept_Alternative then
9613 Remove_Last_Elmt (Accept_Address
9614 (Entity (Entry_Direct_Name (Accept_Statement (Alt)))));
9619 end Expand_N_Selective_Accept;
9621 --------------------------------------
9622 -- Expand_N_Single_Task_Declaration --
9623 --------------------------------------
9625 -- Single task declarations should never be present after semantic
9626 -- analysis, since we expect them to be replaced by a declaration of an
9627 -- anonymous task type, followed by a declaration of the task object. We
9628 -- include this routine to make sure that is happening!
9630 procedure Expand_N_Single_Task_Declaration (N : Node_Id) is
9632 raise Program_Error;
9633 end Expand_N_Single_Task_Declaration;
9635 ------------------------
9636 -- Expand_N_Task_Body --
9637 ------------------------
9639 -- Given a task body
9641 -- task body tname is
9647 -- This expansion routine converts it into a procedure and sets the
9648 -- elaboration flag for the procedure to true, to represent the fact
9649 -- that the task body is now elaborated:
9651 -- procedure tnameB (_Task : access tnameV) is
9652 -- discriminal : dtype renames _Task.discriminant;
9654 -- procedure _clean is
9658 -- Abort_Undefer.all;
9663 -- Abort_Undefer.all;
9665 -- System.Task_Stages.Complete_Activation;
9673 -- In addition, if the task body is an activator, then a call to activate
9674 -- tasks is added at the start of the statements, before the call to
9675 -- Complete_Activation, and if in addition the task is a master then it
9676 -- must be established as a master. These calls are inserted and analyzed
9677 -- in Expand_Cleanup_Actions, when the Handled_Sequence_Of_Statements is
9680 -- There is one discriminal declaration line generated for each
9681 -- discriminant that is present to provide an easy reference point for
9682 -- discriminant references inside the body (see Exp_Ch2.Expand_Name).
9684 -- Note on relationship to GNARLI definition. In the GNARLI definition,
9685 -- task body procedures have a profile (Arg : System.Address). That is
9686 -- needed because GNARLI has to use the same access-to-subprogram type
9687 -- for all task types. We depend here on knowing that in GNAT, passing
9688 -- an address argument by value is identical to passing a record value
9689 -- by access (in either case a single pointer is passed), so even though
9690 -- this procedure has the wrong profile. In fact it's all OK, since the
9691 -- callings sequence is identical.
9693 procedure Expand_N_Task_Body (N : Node_Id) is
9694 Loc : constant Source_Ptr := Sloc (N);
9695 Ttyp : constant Entity_Id := Corresponding_Spec (N);
9699 Insert_Nod : Node_Id;
9700 -- Used to determine the proper location of wrapper body insertions
9703 -- Add renaming declarations for discriminals and a declaration for the
9704 -- entry family index (if applicable).
9706 Install_Private_Data_Declarations
9707 (Loc, Task_Body_Procedure (Ttyp), Ttyp, N, Declarations (N));
9709 -- Add a call to Abort_Undefer at the very beginning of the task
9710 -- body since this body is called with abort still deferred.
9712 if Abort_Allowed then
9713 Call := Build_Runtime_Call (Loc, RE_Abort_Undefer);
9715 (First (Statements (Handled_Statement_Sequence (N))), Call);
9719 -- The statement part has already been protected with an at_end and
9720 -- cleanup actions. The call to Complete_Activation must be placed
9721 -- at the head of the sequence of statements of that block. The
9722 -- declarations have been merged in this sequence of statements but
9723 -- the first real statement is accessible from the First_Real_Statement
9724 -- field (which was set for exactly this purpose).
9726 if Restricted_Profile then
9727 Call := Build_Runtime_Call (Loc, RE_Complete_Restricted_Activation);
9729 Call := Build_Runtime_Call (Loc, RE_Complete_Activation);
9733 (First_Real_Statement (Handled_Statement_Sequence (N)), Call);
9737 Make_Subprogram_Body (Loc,
9738 Specification => Build_Task_Proc_Specification (Ttyp),
9739 Declarations => Declarations (N),
9740 Handled_Statement_Sequence => Handled_Statement_Sequence (N));
9742 -- If the task contains generic instantiations, cleanup actions are
9743 -- delayed until after instantiation. Transfer the activation chain to
9744 -- the subprogram, to insure that the activation call is properly
9745 -- generated. It the task body contains inner tasks, indicate that the
9746 -- subprogram is a task master.
9748 if Delay_Cleanups (Ttyp) then
9749 Set_Activation_Chain_Entity (New_N, Activation_Chain_Entity (N));
9750 Set_Is_Task_Master (New_N, Is_Task_Master (N));
9756 -- Set elaboration flag immediately after task body. If the body is a
9757 -- subunit, the flag is set in the declarative part containing the stub.
9759 if Nkind (Parent (N)) /= N_Subunit then
9761 Make_Assignment_Statement (Loc,
9763 Make_Identifier (Loc, New_External_Name (Chars (Ttyp), 'E')),
9764 Expression => New_Reference_To (Standard_True, Loc)));
9767 -- Ada 2005 (AI-345): Construct the primitive entry wrapper bodies after
9768 -- the task body. At this point all wrapper specs have been created,
9769 -- frozen and included in the dispatch table for the task type.
9771 if Ada_Version >= Ada_05 then
9772 if Nkind (Parent (N)) = N_Subunit then
9773 Insert_Nod := Corresponding_Stub (Parent (N));
9778 Build_Wrapper_Bodies (Loc, Ttyp, Insert_Nod);
9780 end Expand_N_Task_Body;
9782 ------------------------------------
9783 -- Expand_N_Task_Type_Declaration --
9784 ------------------------------------
9786 -- We have several things to do. First we must create a Boolean flag used
9787 -- to mark if the body is elaborated yet. This variable gets set to True
9788 -- when the body of the task is elaborated (we can't rely on the normal
9789 -- ABE mechanism for the task body, since we need to pass an access to
9790 -- this elaboration boolean to the runtime routines).
9792 -- taskE : aliased Boolean := False;
9794 -- Next a variable is declared to hold the task stack size (either the
9795 -- default : Unspecified_Size, or a value that is set by a pragma
9796 -- Storage_Size). If the value of the pragma Storage_Size is static, then
9797 -- the variable is initialized with this value:
9799 -- taskZ : Size_Type := Unspecified_Size;
9801 -- taskZ : Size_Type := Size_Type (size_expression);
9803 -- Note: No variable is needed to hold the task relative deadline since
9804 -- its value would never be static because the parameter is of a private
9805 -- type (Ada.Real_Time.Time_Span).
9807 -- Next we create a corresponding record type declaration used to represent
9808 -- values of this task. The general form of this type declaration is
9810 -- type taskV (discriminants) is record
9811 -- _Task_Id : Task_Id;
9812 -- entry_family : array (bounds) of Void;
9813 -- _Priority : Integer := priority_expression;
9814 -- _Size : Size_Type := Size_Type (size_expression);
9815 -- _Task_Info : Task_Info_Type := task_info_expression;
9818 -- The discriminants are present only if the corresponding task type has
9819 -- discriminants, and they exactly mirror the task type discriminants.
9821 -- The Id field is always present. It contains the Task_Id value, as set by
9822 -- the call to Create_Task. Note that although the task is limited, the
9823 -- task value record type is not limited, so there is no problem in passing
9824 -- this field as an out parameter to Create_Task.
9826 -- One entry_family component is present for each entry family in the task
9827 -- definition. The bounds correspond to the bounds of the entry family
9828 -- (which may depend on discriminants). The element type is void, since we
9829 -- only need the bounds information for determining the entry index. Note
9830 -- that the use of an anonymous array would normally be illegal in this
9831 -- context, but this is a parser check, and the semantics is quite prepared
9832 -- to handle such a case.
9834 -- The _Size field is present only if a Storage_Size pragma appears in the
9835 -- task definition. The expression captures the argument that was present
9836 -- in the pragma, and is used to override the task stack size otherwise
9837 -- associated with the task type.
9839 -- The _Priority field is present only if a Priority or Interrupt_Priority
9840 -- pragma appears in the task definition. The expression captures the
9841 -- argument that was present in the pragma, and is used to provide the Size
9842 -- parameter to the call to Create_Task.
9844 -- The _Task_Info field is present only if a Task_Info pragma appears in
9845 -- the task definition. The expression captures the argument that was
9846 -- present in the pragma, and is used to provide the Task_Image parameter
9847 -- to the call to Create_Task.
9849 -- The _Relative_Deadline field is present only if a Relative_Deadline
9850 -- pragma appears in the task definition. The expression captures the
9851 -- argument that was present in the pragma, and is used to provide the
9852 -- Relative_Deadline parameter to the call to Create_Task.
9854 -- When a task is declared, an instance of the task value record is
9855 -- created. The elaboration of this declaration creates the correct bounds
9856 -- for the entry families, and also evaluates the size, priority, and
9857 -- task_Info expressions if needed. The initialization routine for the task
9858 -- type itself then calls Create_Task with appropriate parameters to
9859 -- initialize the value of the Task_Id field.
9861 -- Note: the address of this record is passed as the "Discriminants"
9862 -- parameter for Create_Task. Since Create_Task merely passes this onto the
9863 -- body procedure, it does not matter that it does not quite match the
9864 -- GNARLI model of what is being passed (the record contains more than just
9865 -- the discriminants, but the discriminants can be found from the record
9868 -- The Entity_Id for this created record type is placed in the
9869 -- Corresponding_Record_Type field of the associated task type entity.
9871 -- Next we create a procedure specification for the task body procedure:
9873 -- procedure taskB (_Task : access taskV);
9875 -- Note that this must come after the record type declaration, since
9876 -- the spec refers to this type. It turns out that the initialization
9877 -- procedure for the value type references the task body spec, but that's
9878 -- fine, since it won't be generated till the freeze point for the type,
9879 -- which is certainly after the task body spec declaration.
9881 -- Finally, we set the task index value field of the entry attribute in
9882 -- the case of a simple entry.
9884 procedure Expand_N_Task_Type_Declaration (N : Node_Id) is
9885 Loc : constant Source_Ptr := Sloc (N);
9886 Tasktyp : constant Entity_Id := Etype (Defining_Identifier (N));
9887 Tasknm : constant Name_Id := Chars (Tasktyp);
9888 Taskdef : constant Node_Id := Task_Definition (N);
9890 Proc_Spec : Node_Id;
9892 Rec_Ent : Entity_Id;
9894 Elab_Decl : Node_Id;
9895 Size_Decl : Node_Id;
9896 Body_Decl : Node_Id;
9897 Task_Size : Node_Id;
9898 Ent_Stack : Entity_Id;
9899 Decl_Stack : Node_Id;
9902 -- If already expanded, nothing to do
9904 if Present (Corresponding_Record_Type (Tasktyp)) then
9908 -- Here we will do the expansion
9910 Rec_Decl := Build_Corresponding_Record (N, Tasktyp, Loc);
9912 -- Ada 2005 (AI-345): Propagate the attribute that contains the list
9913 -- of implemented interfaces.
9915 Set_Interface_List (Type_Definition (Rec_Decl), Interface_List (N));
9917 Rec_Ent := Defining_Identifier (Rec_Decl);
9918 Cdecls := Component_Items (Component_List
9919 (Type_Definition (Rec_Decl)));
9921 Qualify_Entity_Names (N);
9923 -- First create the elaboration variable
9926 Make_Object_Declaration (Loc,
9927 Defining_Identifier =>
9928 Make_Defining_Identifier (Sloc (Tasktyp),
9929 Chars => New_External_Name (Tasknm, 'E')),
9930 Aliased_Present => True,
9931 Object_Definition => New_Reference_To (Standard_Boolean, Loc),
9932 Expression => New_Reference_To (Standard_False, Loc));
9933 Insert_After (N, Elab_Decl);
9935 -- Next create the declaration of the size variable (tasknmZ)
9937 Set_Storage_Size_Variable (Tasktyp,
9938 Make_Defining_Identifier (Sloc (Tasktyp),
9939 Chars => New_External_Name (Tasknm, 'Z')));
9941 if Present (Taskdef) and then Has_Storage_Size_Pragma (Taskdef) and then
9942 Is_Static_Expression (Expression (First (
9943 Pragma_Argument_Associations (Find_Task_Or_Protected_Pragma (
9944 Taskdef, Name_Storage_Size)))))
9947 Make_Object_Declaration (Loc,
9948 Defining_Identifier => Storage_Size_Variable (Tasktyp),
9949 Object_Definition => New_Reference_To (RTE (RE_Size_Type), Loc),
9951 Convert_To (RTE (RE_Size_Type),
9954 Pragma_Argument_Associations (
9955 Find_Task_Or_Protected_Pragma
9956 (Taskdef, Name_Storage_Size)))))));
9960 Make_Object_Declaration (Loc,
9961 Defining_Identifier => Storage_Size_Variable (Tasktyp),
9962 Object_Definition => New_Reference_To (RTE (RE_Size_Type), Loc),
9963 Expression => New_Reference_To (RTE (RE_Unspecified_Size), Loc));
9966 Insert_After (Elab_Decl, Size_Decl);
9968 -- Next build the rest of the corresponding record declaration. This is
9969 -- done last, since the corresponding record initialization procedure
9970 -- will reference the previously created entities.
9972 -- Fill in the component declarations -- first the _Task_Id field
9975 Make_Component_Declaration (Loc,
9976 Defining_Identifier =>
9977 Make_Defining_Identifier (Loc, Name_uTask_Id),
9978 Component_Definition =>
9979 Make_Component_Definition (Loc,
9980 Aliased_Present => False,
9981 Subtype_Indication => New_Reference_To (RTE (RO_ST_Task_Id),
9984 -- Declare static ATCB (that is, created by the expander) if we are
9985 -- using the Restricted run time.
9987 if Restricted_Profile then
9989 Make_Component_Declaration (Loc,
9990 Defining_Identifier =>
9991 Make_Defining_Identifier (Loc, Name_uATCB),
9993 Component_Definition =>
9994 Make_Component_Definition (Loc,
9995 Aliased_Present => True,
9996 Subtype_Indication => Make_Subtype_Indication (Loc,
9997 Subtype_Mark => New_Occurrence_Of
9998 (RTE (RE_Ada_Task_Control_Block), Loc),
10001 Make_Index_Or_Discriminant_Constraint (Loc,
10003 New_List (Make_Integer_Literal (Loc, 0)))))));
10007 -- Declare static stack (that is, created by the expander) if we are
10008 -- using the Restricted run time on a bare board configuration.
10010 if Restricted_Profile
10011 and then Preallocated_Stacks_On_Target
10013 -- First we need to extract the appropriate stack size
10015 Ent_Stack := Make_Defining_Identifier (Loc, Name_uStack);
10017 if Present (Taskdef) and then Has_Storage_Size_Pragma (Taskdef) then
10019 Expr_N : constant Node_Id :=
10020 Expression (First (
10021 Pragma_Argument_Associations (
10022 Find_Task_Or_Protected_Pragma
10023 (Taskdef, Name_Storage_Size))));
10024 Etyp : constant Entity_Id := Etype (Expr_N);
10025 P : constant Node_Id := Parent (Expr_N);
10028 -- The stack is defined inside the corresponding record.
10029 -- Therefore if the size of the stack is set by means of
10030 -- a discriminant, we must reference the discriminant of the
10031 -- corresponding record type.
10033 if Nkind (Expr_N) in N_Has_Entity
10034 and then Present (Discriminal_Link (Entity (Expr_N)))
10038 (CR_Discriminant (Discriminal_Link (Entity (Expr_N))),
10040 Set_Parent (Task_Size, P);
10041 Set_Etype (Task_Size, Etyp);
10042 Set_Analyzed (Task_Size);
10045 Task_Size := Relocate_Node (Expr_N);
10051 New_Reference_To (RTE (RE_Default_Stack_Size), Loc);
10054 Decl_Stack := Make_Component_Declaration (Loc,
10055 Defining_Identifier => Ent_Stack,
10057 Component_Definition =>
10058 Make_Component_Definition (Loc,
10059 Aliased_Present => True,
10060 Subtype_Indication => Make_Subtype_Indication (Loc,
10062 New_Occurrence_Of (RTE (RE_Storage_Array), Loc),
10065 Make_Index_Or_Discriminant_Constraint (Loc,
10066 Constraints => New_List (Make_Range (Loc,
10067 Low_Bound => Make_Integer_Literal (Loc, 1),
10068 High_Bound => Convert_To (RTE (RE_Storage_Offset),
10071 Append_To (Cdecls, Decl_Stack);
10073 -- The appropriate alignment for the stack is ensured by the run-time
10074 -- code in charge of task creation.
10078 -- Add components for entry families
10080 Collect_Entry_Families (Loc, Cdecls, Size_Decl, Tasktyp);
10082 -- Add the _Priority component if a Priority pragma is present
10084 if Present (Taskdef) and then Has_Priority_Pragma (Taskdef) then
10086 Prag : constant Node_Id :=
10087 Find_Task_Or_Protected_Pragma (Taskdef, Name_Priority);
10091 Expr := First (Pragma_Argument_Associations (Prag));
10093 if Nkind (Expr) = N_Pragma_Argument_Association then
10094 Expr := Expression (Expr);
10097 Expr := New_Copy_Tree (Expr);
10099 -- Add conversion to proper type to do range check if required
10100 -- Note that for runtime units, we allow out of range interrupt
10101 -- priority values to be used in a priority pragma. This is for
10102 -- the benefit of some versions of System.Interrupts which use
10103 -- a special server task with maximum interrupt priority.
10105 if Pragma_Name (Prag) = Name_Priority
10106 and then not GNAT_Mode
10108 Rewrite (Expr, Convert_To (RTE (RE_Priority), Expr));
10110 Rewrite (Expr, Convert_To (RTE (RE_Any_Priority), Expr));
10114 Make_Component_Declaration (Loc,
10115 Defining_Identifier =>
10116 Make_Defining_Identifier (Loc, Name_uPriority),
10117 Component_Definition =>
10118 Make_Component_Definition (Loc,
10119 Aliased_Present => False,
10120 Subtype_Indication => New_Reference_To (Standard_Integer,
10122 Expression => Expr));
10126 -- Add the _Task_Size component if a Storage_Size pragma is present
10128 if Present (Taskdef)
10129 and then Has_Storage_Size_Pragma (Taskdef)
10132 Make_Component_Declaration (Loc,
10133 Defining_Identifier =>
10134 Make_Defining_Identifier (Loc, Name_uSize),
10136 Component_Definition =>
10137 Make_Component_Definition (Loc,
10138 Aliased_Present => False,
10139 Subtype_Indication => New_Reference_To (RTE (RE_Size_Type),
10143 Convert_To (RTE (RE_Size_Type),
10145 Expression (First (
10146 Pragma_Argument_Associations (
10147 Find_Task_Or_Protected_Pragma
10148 (Taskdef, Name_Storage_Size))))))));
10151 -- Add the _Task_Info component if a Task_Info pragma is present
10153 if Present (Taskdef) and then Has_Task_Info_Pragma (Taskdef) then
10155 Make_Component_Declaration (Loc,
10156 Defining_Identifier =>
10157 Make_Defining_Identifier (Loc, Name_uTask_Info),
10159 Component_Definition =>
10160 Make_Component_Definition (Loc,
10161 Aliased_Present => False,
10162 Subtype_Indication =>
10163 New_Reference_To (RTE (RE_Task_Info_Type), Loc)),
10165 Expression => New_Copy (
10166 Expression (First (
10167 Pragma_Argument_Associations (
10168 Find_Task_Or_Protected_Pragma
10169 (Taskdef, Name_Task_Info)))))));
10172 -- Add the _Relative_Deadline component if a Relative_Deadline pragma is
10173 -- present. If we are using a restricted run time this component will
10174 -- not be added (deadlines are not allowed by the Ravenscar profile).
10176 if not Restricted_Profile
10177 and then Present (Taskdef)
10178 and then Has_Relative_Deadline_Pragma (Taskdef)
10181 Make_Component_Declaration (Loc,
10182 Defining_Identifier =>
10183 Make_Defining_Identifier (Loc, Name_uRelative_Deadline),
10185 Component_Definition =>
10186 Make_Component_Definition (Loc,
10187 Aliased_Present => False,
10188 Subtype_Indication =>
10189 New_Reference_To (RTE (RE_Time_Span), Loc)),
10192 Convert_To (RTE (RE_Time_Span),
10194 Expression (First (
10195 Pragma_Argument_Associations (
10196 Find_Task_Or_Protected_Pragma
10197 (Taskdef, Name_Relative_Deadline))))))));
10200 Insert_After (Size_Decl, Rec_Decl);
10202 -- Analyze the record declaration immediately after construction,
10203 -- because the initialization procedure is needed for single task
10204 -- declarations before the next entity is analyzed.
10206 Analyze (Rec_Decl);
10208 -- Create the declaration of the task body procedure
10210 Proc_Spec := Build_Task_Proc_Specification (Tasktyp);
10212 Make_Subprogram_Declaration (Loc,
10213 Specification => Proc_Spec);
10215 Insert_After (Rec_Decl, Body_Decl);
10217 -- The subprogram does not comes from source, so we have to indicate the
10218 -- need for debugging information explicitly.
10220 if Comes_From_Source (Original_Node (N)) then
10221 Set_Debug_Info_Needed (Defining_Entity (Proc_Spec));
10224 -- Ada 2005 (AI-345): Construct the primitive entry wrapper specs before
10225 -- the corresponding record has been frozen.
10227 if Ada_Version >= Ada_05 then
10228 Build_Wrapper_Specs (Loc, Tasktyp, Rec_Decl);
10231 -- Ada 2005 (AI-345): We must defer freezing to allow further
10232 -- declaration of primitive subprograms covering task interfaces
10234 if Ada_Version <= Ada_95 then
10236 -- Now we can freeze the corresponding record. This needs manually
10237 -- freezing, since it is really part of the task type, and the task
10238 -- type is frozen at this stage. We of course need the initialization
10239 -- procedure for this corresponding record type and we won't get it
10240 -- in time if we don't freeze now.
10243 L : constant List_Id := Freeze_Entity (Rec_Ent, Loc);
10245 if Is_Non_Empty_List (L) then
10246 Insert_List_After (Body_Decl, L);
10251 -- Complete the expansion of access types to the current task type, if
10252 -- any were declared.
10254 Expand_Previous_Access_Type (Tasktyp);
10255 end Expand_N_Task_Type_Declaration;
10257 -------------------------------
10258 -- Expand_N_Timed_Entry_Call --
10259 -------------------------------
10261 -- A timed entry call in normal case is not implemented using ATC mechanism
10262 -- anymore for efficiency reason.
10272 -- is expanded as follow:
10274 -- 1) When T.E is a task entry_call;
10278 -- X : Task_Entry_Index := <entry index>;
10279 -- DX : Duration := To_Duration (D);
10280 -- M : Delay_Mode := <discriminant>;
10281 -- P : parms := (parm, parm, parm);
10284 -- Timed_Protected_Entry_Call
10285 -- (<acceptor-task>, X, P'Address, DX, M, B);
10293 -- 2) When T.E is a protected entry_call;
10297 -- X : Protected_Entry_Index := <entry index>;
10298 -- DX : Duration := To_Duration (D);
10299 -- M : Delay_Mode := <discriminant>;
10300 -- P : parms := (parm, parm, parm);
10303 -- Timed_Protected_Entry_Call
10304 -- (<object>'unchecked_access, X, P'Address, DX, M, B);
10312 -- 3) Ada 2005 (AI-345): When T.E is a dispatching procedure call;
10315 -- B : Boolean := False;
10316 -- C : Ada.Tags.Prim_Op_Kind;
10317 -- DX : Duration := To_Duration (D)
10318 -- K : Ada.Tags.Tagged_Kind :=
10319 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (<object>));
10320 -- M : Integer :=...;
10321 -- P : Parameters := (Param1 .. ParamN);
10325 -- if K = Ada.Tags.TK_Limited_Tagged then
10326 -- <dispatching-call>;
10327 -- <triggering-statements>
10331 -- Ada.Tags.Get_Offset_Index
10332 -- (Ada.Tags.Tag (<object>), DT_Position (<dispatching-call>));
10334 -- _Disp_Timed_Select (<object>, S, P'Address, DX, M, C, B);
10336 -- if C = POK_Protected_Entry
10337 -- or else C = POK_Task_Entry
10339 -- Param1 := P.Param1;
10341 -- ParamN := P.ParamN;
10345 -- if C = POK_Procedure
10346 -- or else C = POK_Protected_Procedure
10347 -- or else C = POK_Task_Procedure
10349 -- <dispatching-call>;
10352 -- <triggering-statements>
10354 -- <timed-statements>
10359 procedure Expand_N_Timed_Entry_Call (N : Node_Id) is
10360 Loc : constant Source_Ptr := Sloc (N);
10362 E_Call : Node_Id :=
10363 Entry_Call_Statement (Entry_Call_Alternative (N));
10364 E_Stats : constant List_Id :=
10365 Statements (Entry_Call_Alternative (N));
10366 D_Stat : Node_Id :=
10367 Delay_Statement (Delay_Alternative (N));
10368 D_Stats : constant List_Id :=
10369 Statements (Delay_Alternative (N));
10372 Blk_Typ : Entity_Id;
10374 Call_Ent : Entity_Id;
10375 Conc_Typ_Stmts : List_Id;
10379 D_Type : Entity_Id;
10385 Is_Disp_Select : Boolean;
10386 Lim_Typ_Stmts : List_Id;
10395 B : Entity_Id; -- Call status flag
10396 C : Entity_Id; -- Call kind
10397 D : Entity_Id; -- Delay
10398 K : Entity_Id; -- Tagged kind
10399 M : Entity_Id; -- Delay mode
10400 P : Entity_Id; -- Parameter block
10401 S : Entity_Id; -- Primitive operation slot
10404 -- Under the Ravenscar profile, timed entry calls are excluded. An error
10405 -- was already reported on spec, so do not attempt to expand the call.
10407 if Restriction_Active (No_Select_Statements) then
10411 -- The arguments in the call may require dynamic allocation, and the
10412 -- call statement may have been transformed into a block. The block
10413 -- may contain additional declarations for internal entities, and the
10414 -- original call is found by sequential search.
10416 if Nkind (E_Call) = N_Block_Statement then
10417 E_Call := First (Statements (Handled_Statement_Sequence (E_Call)));
10418 while not Nkind_In (E_Call, N_Procedure_Call_Statement,
10419 N_Entry_Call_Statement)
10426 Ada_Version >= Ada_05
10427 and then Nkind (E_Call) = N_Procedure_Call_Statement;
10429 if Is_Disp_Select then
10430 Extract_Dispatching_Call (E_Call, Call_Ent, Obj, Actuals, Formals);
10436 -- B : Boolean := False;
10438 B := Build_B (Loc, Decls);
10441 -- C : Ada.Tags.Prim_Op_Kind;
10443 C := Build_C (Loc, Decls);
10445 -- Because the analysis of all statements was disabled, manually
10446 -- analyze the delay statement.
10449 D_Stat := Original_Node (D_Stat);
10452 -- Build an entry call using Simple_Entry_Call
10454 Extract_Entry (E_Call, Concval, Ename, Index);
10455 Build_Simple_Entry_Call (E_Call, Concval, Ename, Index);
10457 Decls := Declarations (E_Call);
10458 Stmts := Statements (Handled_Statement_Sequence (E_Call));
10467 B := Make_Defining_Identifier (Loc, Name_uB);
10470 Make_Object_Declaration (Loc,
10471 Defining_Identifier =>
10473 Object_Definition =>
10474 New_Reference_To (Standard_Boolean, Loc)));
10477 -- Duration and mode processing
10479 D_Type := Base_Type (Etype (Expression (D_Stat)));
10481 -- Use the type of the delay expression (Calendar or Real_Time) to
10482 -- generate the appropriate conversion.
10484 if Nkind (D_Stat) = N_Delay_Relative_Statement then
10485 D_Disc := Make_Integer_Literal (Loc, 0);
10486 D_Conv := Relocate_Node (Expression (D_Stat));
10488 elsif Is_RTE (D_Type, RO_CA_Time) then
10489 D_Disc := Make_Integer_Literal (Loc, 1);
10490 D_Conv := Make_Function_Call (Loc,
10491 New_Reference_To (RTE (RO_CA_To_Duration), Loc),
10492 New_List (New_Copy (Expression (D_Stat))));
10494 else pragma Assert (Is_RTE (D_Type, RO_RT_Time));
10495 D_Disc := Make_Integer_Literal (Loc, 2);
10496 D_Conv := Make_Function_Call (Loc,
10497 New_Reference_To (RTE (RO_RT_To_Duration), Loc),
10498 New_List (New_Copy (Expression (D_Stat))));
10501 D := Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
10507 Make_Object_Declaration (Loc,
10508 Defining_Identifier =>
10510 Object_Definition =>
10511 New_Reference_To (Standard_Duration, Loc)));
10513 M := Make_Defining_Identifier (Loc, New_Internal_Name ('M'));
10516 -- M : Integer := (0 | 1 | 2);
10519 Make_Object_Declaration (Loc,
10520 Defining_Identifier =>
10522 Object_Definition =>
10523 New_Reference_To (Standard_Integer, Loc),
10527 -- Do the assignment at this stage only because the evaluation of the
10528 -- expression must not occur before (see ACVC C97302A).
10531 Make_Assignment_Statement (Loc,
10533 New_Reference_To (D, Loc),
10537 -- Parameter block processing
10539 -- Manually create the parameter block for dispatching calls. In the
10540 -- case of entries, the block has already been created during the call
10541 -- to Build_Simple_Entry_Call.
10543 if Is_Disp_Select then
10545 -- Tagged kind processing, generate:
10546 -- K : Ada.Tags.Tagged_Kind :=
10547 -- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag <object>));
10549 K := Build_K (Loc, Decls, Obj);
10551 Blk_Typ := Build_Parameter_Block (Loc, Actuals, Formals, Decls);
10552 P := Parameter_Block_Pack
10553 (Loc, Blk_Typ, Actuals, Formals, Decls, Stmts);
10555 -- Dispatch table slot processing, generate:
10558 S := Build_S (Loc, Decls);
10561 -- S := Ada.Tags.Get_Offset_Index
10562 -- (Ada.Tags.Tag (<object>), DT_Position (Call_Ent));
10565 New_List (Build_S_Assignment (Loc, S, Obj, Call_Ent));
10568 -- _Disp_Timed_Select (<object>, S, P'Address, D, M, C, B);
10570 -- where Obj is the controlling formal parameter, S is the dispatch
10571 -- table slot number of the dispatching operation, P is the wrapped
10572 -- parameter block, D is the duration, M is the duration mode, C is
10573 -- the call kind and B is the call status.
10575 Params := New_List;
10577 Append_To (Params, New_Copy_Tree (Obj));
10578 Append_To (Params, New_Reference_To (S, Loc));
10579 Append_To (Params, Make_Attribute_Reference (Loc,
10580 Prefix => New_Reference_To (P, Loc),
10581 Attribute_Name => Name_Address));
10582 Append_To (Params, New_Reference_To (D, Loc));
10583 Append_To (Params, New_Reference_To (M, Loc));
10584 Append_To (Params, New_Reference_To (C, Loc));
10585 Append_To (Params, New_Reference_To (B, Loc));
10587 Append_To (Conc_Typ_Stmts,
10588 Make_Procedure_Call_Statement (Loc,
10591 Find_Prim_Op (Etype (Etype (Obj)),
10592 Name_uDisp_Timed_Select),
10594 Parameter_Associations =>
10598 -- if C = POK_Protected_Entry
10599 -- or else C = POK_Task_Entry
10601 -- Param1 := P.Param1;
10603 -- ParamN := P.ParamN;
10606 Unpack := Parameter_Block_Unpack (Loc, P, Actuals, Formals);
10608 -- Generate the if statement only when the packed parameters need
10609 -- explicit assignments to their corresponding actuals.
10611 if Present (Unpack) then
10612 Append_To (Conc_Typ_Stmts,
10613 Make_If_Statement (Loc,
10620 New_Reference_To (C, Loc),
10622 New_Reference_To (RTE (
10623 RE_POK_Protected_Entry), Loc)),
10627 New_Reference_To (C, Loc),
10629 New_Reference_To (RTE (RE_POK_Task_Entry), Loc))),
10638 -- if C = POK_Procedure
10639 -- or else C = POK_Protected_Procedure
10640 -- or else C = POK_Task_Procedure
10642 -- <dispatching-call>
10644 -- <triggering-statements>
10646 -- <timed-statements>
10649 N_Stats := New_Copy_List_Tree (E_Stats);
10651 Prepend_To (N_Stats,
10652 Make_If_Statement (Loc,
10659 New_Reference_To (C, Loc),
10661 New_Reference_To (RTE (RE_POK_Procedure), Loc)),
10667 New_Reference_To (C, Loc),
10669 New_Reference_To (RTE (
10670 RE_POK_Protected_Procedure), Loc)),
10674 New_Reference_To (C, Loc),
10676 New_Reference_To (RTE (
10677 RE_POK_Task_Procedure), Loc)))),
10680 New_List (E_Call)));
10682 Append_To (Conc_Typ_Stmts,
10683 Make_If_Statement (Loc,
10684 Condition => New_Reference_To (B, Loc),
10685 Then_Statements => N_Stats,
10686 Else_Statements => D_Stats));
10689 -- <dispatching-call>;
10690 -- <triggering-statements>
10692 Lim_Typ_Stmts := New_Copy_List_Tree (E_Stats);
10693 Prepend_To (Lim_Typ_Stmts, New_Copy_Tree (E_Call));
10696 -- if K = Ada.Tags.TK_Limited_Tagged then
10703 Make_If_Statement (Loc,
10707 New_Reference_To (K, Loc),
10709 New_Reference_To (RTE (RE_TK_Limited_Tagged), Loc)),
10718 -- Skip assignments to temporaries created for in-out parameters.
10719 -- This makes unwarranted assumptions about the shape of the expanded
10720 -- tree for the call, and should be cleaned up ???
10722 Stmt := First (Stmts);
10723 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
10727 -- Do the assignment at this stage only because the evaluation
10728 -- of the expression must not occur before (see ACVC C97302A).
10730 Insert_Before (Stmt,
10731 Make_Assignment_Statement (Loc,
10732 Name => New_Reference_To (D, Loc),
10733 Expression => D_Conv));
10736 Params := Parameter_Associations (Call);
10738 -- For a protected type, we build a Timed_Protected_Entry_Call
10740 if Is_Protected_Type (Etype (Concval)) then
10742 -- Create a new call statement
10744 Param := First (Params);
10745 while Present (Param)
10746 and then not Is_RTE (Etype (Param), RE_Call_Modes)
10751 Dummy := Remove_Next (Next (Param));
10753 -- Remove garbage is following the Cancel_Param if present
10755 Dummy := Next (Param);
10757 -- Remove the mode of the Protected_Entry_Call call, then remove
10758 -- the Communication_Block of the Protected_Entry_Call call, and
10759 -- finally add Duration and a Delay_Mode parameter
10761 pragma Assert (Present (Param));
10762 Rewrite (Param, New_Reference_To (D, Loc));
10764 Rewrite (Dummy, New_Reference_To (M, Loc));
10766 -- Add a Boolean flag for successful entry call
10768 Append_To (Params, New_Reference_To (B, Loc));
10770 case Corresponding_Runtime_Package (Etype (Concval)) is
10771 when System_Tasking_Protected_Objects_Entries =>
10773 Make_Procedure_Call_Statement (Loc,
10776 (RTE (RE_Timed_Protected_Entry_Call), Loc),
10777 Parameter_Associations => Params));
10779 when System_Tasking_Protected_Objects_Single_Entry =>
10780 Param := First (Params);
10781 while Present (Param)
10783 Is_RTE (Etype (Param), RE_Protected_Entry_Index)
10791 Make_Procedure_Call_Statement (Loc,
10792 Name => New_Reference_To (
10793 RTE (RE_Timed_Protected_Single_Entry_Call), Loc),
10794 Parameter_Associations => Params));
10797 raise Program_Error;
10800 -- For the task case, build a Timed_Task_Entry_Call
10803 -- Create a new call statement
10805 Append_To (Params, New_Reference_To (D, Loc));
10806 Append_To (Params, New_Reference_To (M, Loc));
10807 Append_To (Params, New_Reference_To (B, Loc));
10810 Make_Procedure_Call_Statement (Loc,
10812 New_Reference_To (RTE (RE_Timed_Task_Entry_Call), Loc),
10813 Parameter_Associations => Params));
10817 Make_Implicit_If_Statement (N,
10818 Condition => New_Reference_To (B, Loc),
10819 Then_Statements => E_Stats,
10820 Else_Statements => D_Stats));
10824 Make_Block_Statement (Loc,
10825 Declarations => Decls,
10826 Handled_Statement_Sequence =>
10827 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
10830 end Expand_N_Timed_Entry_Call;
10832 ----------------------------------------
10833 -- Expand_Protected_Body_Declarations --
10834 ----------------------------------------
10836 procedure Expand_Protected_Body_Declarations
10838 Spec_Id : Entity_Id)
10841 if No_Run_Time_Mode then
10842 Error_Msg_CRT ("protected body", N);
10845 elsif Expander_Active then
10847 -- Associate discriminals with the first subprogram or entry body to
10850 if Present (First_Protected_Operation (Declarations (N))) then
10851 Set_Discriminals (Parent (Spec_Id));
10854 end Expand_Protected_Body_Declarations;
10856 -------------------------
10857 -- External_Subprogram --
10858 -------------------------
10860 function External_Subprogram (E : Entity_Id) return Entity_Id is
10861 Subp : constant Entity_Id := Protected_Body_Subprogram (E);
10864 -- The internal and external subprograms follow each other on the entity
10865 -- chain. Note that previously private operations had no separate
10866 -- external subprogram. We now create one in all cases, because a
10867 -- private operation may actually appear in an external call, through
10868 -- a 'Access reference used for a callback.
10870 -- If the operation is a function that returns an anonymous access type,
10871 -- the corresponding itype appears before the operation, and must be
10874 -- This mechanism is fragile, there should be a real link between the
10875 -- two versions of the operation, but there is no place to put it ???
10877 if Is_Access_Type (Next_Entity (Subp)) then
10878 return Next_Entity (Next_Entity (Subp));
10880 return Next_Entity (Subp);
10882 end External_Subprogram;
10884 ------------------------------
10885 -- Extract_Dispatching_Call --
10886 ------------------------------
10888 procedure Extract_Dispatching_Call
10890 Call_Ent : out Entity_Id;
10891 Object : out Entity_Id;
10892 Actuals : out List_Id;
10893 Formals : out List_Id)
10895 Call_Nam : Node_Id;
10898 pragma Assert (Nkind (N) = N_Procedure_Call_Statement);
10900 if Present (Original_Node (N)) then
10901 Call_Nam := Name (Original_Node (N));
10903 Call_Nam := Name (N);
10906 -- Retrieve the name of the dispatching procedure. It contains the
10907 -- dispatch table slot number.
10910 case Nkind (Call_Nam) is
10911 when N_Identifier =>
10914 when N_Selected_Component =>
10915 Call_Nam := Selector_Name (Call_Nam);
10918 raise Program_Error;
10923 Actuals := Parameter_Associations (N);
10924 Call_Ent := Entity (Call_Nam);
10925 Formals := Parameter_Specifications (Parent (Call_Ent));
10926 Object := First (Actuals);
10928 if Present (Original_Node (Object)) then
10929 Object := Original_Node (Object);
10931 end Extract_Dispatching_Call;
10933 -------------------
10934 -- Extract_Entry --
10935 -------------------
10937 procedure Extract_Entry
10939 Concval : out Node_Id;
10940 Ename : out Node_Id;
10941 Index : out Node_Id)
10943 Nam : constant Node_Id := Name (N);
10946 -- For a simple entry, the name is a selected component, with the
10947 -- prefix being the task value, and the selector being the entry.
10949 if Nkind (Nam) = N_Selected_Component then
10950 Concval := Prefix (Nam);
10951 Ename := Selector_Name (Nam);
10954 -- For a member of an entry family, the name is an indexed component
10955 -- where the prefix is a selected component, whose prefix in turn is
10956 -- the task value, and whose selector is the entry family. The single
10957 -- expression in the expressions list of the indexed component is the
10958 -- subscript for the family.
10960 else pragma Assert (Nkind (Nam) = N_Indexed_Component);
10961 Concval := Prefix (Prefix (Nam));
10962 Ename := Selector_Name (Prefix (Nam));
10963 Index := First (Expressions (Nam));
10967 -------------------
10968 -- Family_Offset --
10969 -------------------
10971 function Family_Offset
10976 Cap : Boolean) return Node_Id
10982 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
10983 -- If one of the bounds is a reference to a discriminant, replace with
10984 -- corresponding discriminal of type. Within the body of a task retrieve
10985 -- the renamed discriminant by simple visibility, using its generated
10986 -- name. Within a protected object, find the original discriminant and
10987 -- replace it with the discriminal of the current protected operation.
10989 ------------------------------
10990 -- Convert_Discriminant_Ref --
10991 ------------------------------
10993 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
10994 Loc : constant Source_Ptr := Sloc (Bound);
10999 if Is_Entity_Name (Bound)
11000 and then Ekind (Entity (Bound)) = E_Discriminant
11002 if Is_Task_Type (Ttyp)
11003 and then Has_Completion (Ttyp)
11005 B := Make_Identifier (Loc, Chars (Entity (Bound)));
11006 Find_Direct_Name (B);
11008 elsif Is_Protected_Type (Ttyp) then
11009 D := First_Discriminant (Ttyp);
11010 while Chars (D) /= Chars (Entity (Bound)) loop
11011 Next_Discriminant (D);
11014 B := New_Reference_To (Discriminal (D), Loc);
11017 B := New_Reference_To (Discriminal (Entity (Bound)), Loc);
11020 elsif Nkind (Bound) = N_Attribute_Reference then
11024 B := New_Copy_Tree (Bound);
11028 Make_Attribute_Reference (Loc,
11029 Attribute_Name => Name_Pos,
11030 Prefix => New_Occurrence_Of (Etype (Bound), Loc),
11031 Expressions => New_List (B));
11032 end Convert_Discriminant_Ref;
11034 -- Start of processing for Family_Offset
11037 Real_Hi := Convert_Discriminant_Ref (Hi);
11038 Real_Lo := Convert_Discriminant_Ref (Lo);
11041 if Is_Task_Type (Ttyp) then
11042 Ityp := RTE (RE_Task_Entry_Index);
11044 Ityp := RTE (RE_Protected_Entry_Index);
11048 Make_Attribute_Reference (Loc,
11049 Prefix => New_Reference_To (Ityp, Loc),
11050 Attribute_Name => Name_Min,
11051 Expressions => New_List (
11053 Make_Integer_Literal (Loc, Entry_Family_Bound - 1)));
11056 Make_Attribute_Reference (Loc,
11057 Prefix => New_Reference_To (Ityp, Loc),
11058 Attribute_Name => Name_Max,
11059 Expressions => New_List (
11061 Make_Integer_Literal (Loc, -Entry_Family_Bound)));
11064 return Make_Op_Subtract (Loc, Real_Hi, Real_Lo);
11071 function Family_Size
11076 Cap : Boolean) return Node_Id
11081 if Is_Task_Type (Ttyp) then
11082 Ityp := RTE (RE_Task_Entry_Index);
11084 Ityp := RTE (RE_Protected_Entry_Index);
11088 Make_Attribute_Reference (Loc,
11089 Prefix => New_Reference_To (Ityp, Loc),
11090 Attribute_Name => Name_Max,
11091 Expressions => New_List (
11094 Family_Offset (Loc, Hi, Lo, Ttyp, Cap),
11096 Make_Integer_Literal (Loc, 1)),
11097 Make_Integer_Literal (Loc, 0)));
11100 -----------------------------------
11101 -- Find_Task_Or_Protected_Pragma --
11102 -----------------------------------
11104 function Find_Task_Or_Protected_Pragma
11106 P : Name_Id) return Node_Id
11111 N := First (Visible_Declarations (T));
11112 while Present (N) loop
11113 if Nkind (N) = N_Pragma then
11114 if Pragma_Name (N) = P then
11117 elsif P = Name_Priority
11118 and then Pragma_Name (N) = Name_Interrupt_Priority
11131 N := First (Private_Declarations (T));
11132 while Present (N) loop
11133 if Nkind (N) = N_Pragma then
11134 if Pragma_Name (N) = P then
11137 elsif P = Name_Priority
11138 and then Pragma_Name (N) = Name_Interrupt_Priority
11151 raise Program_Error;
11152 end Find_Task_Or_Protected_Pragma;
11154 -------------------------------
11155 -- First_Protected_Operation --
11156 -------------------------------
11158 function First_Protected_Operation (D : List_Id) return Node_Id is
11159 First_Op : Node_Id;
11162 First_Op := First (D);
11163 while Present (First_Op)
11164 and then not Nkind_In (First_Op, N_Subprogram_Body, N_Entry_Body)
11170 end First_Protected_Operation;
11172 ---------------------------------------
11173 -- Install_Private_Data_Declarations --
11174 ---------------------------------------
11176 procedure Install_Private_Data_Declarations
11178 Spec_Id : Entity_Id;
11179 Conc_Typ : Entity_Id;
11180 Body_Nod : Node_Id;
11182 Barrier : Boolean := False;
11183 Family : Boolean := False)
11185 Is_Protected : constant Boolean := Is_Protected_Type (Conc_Typ);
11188 Insert_Node : Node_Id := Empty;
11189 Obj_Ent : Entity_Id;
11191 procedure Add (Decl : Node_Id);
11192 -- Add a single declaration after Insert_Node. If this is the first
11193 -- addition, Decl is added to the front of Decls and it becomes the
11196 function Replace_Bound (Bound : Node_Id) return Node_Id;
11197 -- The bounds of an entry index may depend on discriminants, create a
11198 -- reference to the corresponding prival. Otherwise return a duplicate
11199 -- of the original bound.
11205 procedure Add (Decl : Node_Id) is
11207 if No (Insert_Node) then
11208 Prepend_To (Decls, Decl);
11210 Insert_After (Insert_Node, Decl);
11213 Insert_Node := Decl;
11216 --------------------------
11217 -- Replace_Discriminant --
11218 --------------------------
11220 function Replace_Bound (Bound : Node_Id) return Node_Id is
11222 if Nkind (Bound) = N_Identifier
11223 and then Is_Discriminal (Entity (Bound))
11225 return Make_Identifier (Loc, Chars (Entity (Bound)));
11227 return Duplicate_Subexpr (Bound);
11231 -- Start of processing for Install_Private_Data_Declarations
11234 -- Step 1: Retrieve the concurrent object entity. Obj_Ent can denote
11235 -- formal parameter _O, _object or _task depending on the context.
11237 Obj_Ent := Concurrent_Object (Spec_Id, Conc_Typ);
11239 -- Special processing of _O for barrier functions, protected entries
11246 (Ekind (Spec_Id) = E_Entry
11247 or else Ekind (Spec_Id) = E_Entry_Family))
11250 Conc_Rec : constant Entity_Id :=
11251 Corresponding_Record_Type (Conc_Typ);
11252 Typ_Id : constant Entity_Id :=
11253 Make_Defining_Identifier (Loc,
11254 New_External_Name (Chars (Conc_Rec), 'P'));
11257 -- type prot_typVP is access prot_typV;
11260 Make_Full_Type_Declaration (Loc,
11261 Defining_Identifier => Typ_Id,
11263 Make_Access_To_Object_Definition (Loc,
11264 Subtype_Indication =>
11265 New_Reference_To (Conc_Rec, Loc)));
11269 -- _object : prot_typVP := prot_typV (_O);
11272 Make_Object_Declaration (Loc,
11273 Defining_Identifier =>
11274 Make_Defining_Identifier (Loc, Name_uObject),
11275 Object_Definition => New_Reference_To (Typ_Id, Loc),
11277 Unchecked_Convert_To (Typ_Id,
11278 New_Reference_To (Obj_Ent, Loc)));
11281 -- Set the reference to the concurrent object
11283 Obj_Ent := Defining_Identifier (Decl);
11287 -- Step 2: Create the Protection object and build its declaration for
11288 -- any protected entry (family) of subprogram.
11290 if Is_Protected then
11292 Prot_Ent : constant Entity_Id :=
11293 Make_Defining_Identifier (Loc,
11294 New_Internal_Name ('R'));
11298 Set_Protection_Object (Spec_Id, Prot_Ent);
11300 -- Determine the proper protection type
11302 if Has_Attach_Handler (Conc_Typ)
11303 and then not Restricted_Profile
11305 Prot_Typ := RE_Static_Interrupt_Protection;
11307 elsif Has_Interrupt_Handler (Conc_Typ) then
11308 Prot_Typ := RE_Dynamic_Interrupt_Protection;
11310 -- The type has explicit entries or generated primitive entry
11313 elsif Has_Entries (Conc_Typ)
11315 (Ada_Version >= Ada_05
11316 and then Present (Interface_List (Parent (Conc_Typ))))
11318 case Corresponding_Runtime_Package (Conc_Typ) is
11319 when System_Tasking_Protected_Objects_Entries =>
11320 Prot_Typ := RE_Protection_Entries;
11322 when System_Tasking_Protected_Objects_Single_Entry =>
11323 Prot_Typ := RE_Protection_Entry;
11326 raise Program_Error;
11330 Prot_Typ := RE_Protection;
11334 -- conc_typR : protection_typ renames _object._object;
11337 Make_Object_Renaming_Declaration (Loc,
11338 Defining_Identifier => Prot_Ent,
11340 New_Reference_To (RTE (Prot_Typ), Loc),
11342 Make_Selected_Component (Loc,
11344 New_Reference_To (Obj_Ent, Loc),
11346 Make_Identifier (Loc, Name_uObject)));
11351 -- Step 3: Add discriminant renamings (if any)
11353 if Has_Discriminants (Conc_Typ) then
11358 D := First_Discriminant (Conc_Typ);
11359 while Present (D) loop
11361 -- Adjust the source location
11363 Set_Sloc (Discriminal (D), Loc);
11366 -- discr_name : discr_typ renames _object.discr_name;
11368 -- discr_name : discr_typ renames _task.discr_name;
11371 Make_Object_Renaming_Declaration (Loc,
11372 Defining_Identifier => Discriminal (D),
11373 Subtype_Mark => New_Reference_To (Etype (D), Loc),
11375 Make_Selected_Component (Loc,
11376 Prefix => New_Reference_To (Obj_Ent, Loc),
11377 Selector_Name => Make_Identifier (Loc, Chars (D))));
11380 Next_Discriminant (D);
11385 -- Step 4: Add private component renamings (if any)
11387 if Is_Protected then
11388 Def := Protected_Definition (Parent (Conc_Typ));
11390 if Present (Private_Declarations (Def)) then
11393 Comp_Id : Entity_Id;
11394 Decl_Id : Entity_Id;
11397 Comp := First (Private_Declarations (Def));
11398 while Present (Comp) loop
11399 if Nkind (Comp) = N_Component_Declaration then
11400 Comp_Id := Defining_Identifier (Comp);
11402 Make_Defining_Identifier (Loc, Chars (Comp_Id));
11404 -- Minimal decoration
11406 if Ekind (Spec_Id) = E_Function then
11407 Set_Ekind (Decl_Id, E_Constant);
11409 Set_Ekind (Decl_Id, E_Variable);
11412 Set_Prival (Comp_Id, Decl_Id);
11413 Set_Prival_Link (Decl_Id, Comp_Id);
11414 Set_Is_Aliased (Decl_Id, Is_Aliased (Comp_Id));
11417 -- comp_name : comp_typ renames _object.comp_name;
11420 Make_Object_Renaming_Declaration (Loc,
11421 Defining_Identifier => Decl_Id,
11423 New_Reference_To (Etype (Comp_Id), Loc),
11425 Make_Selected_Component (Loc,
11427 New_Reference_To (Obj_Ent, Loc),
11429 Make_Identifier (Loc, Chars (Comp_Id))));
11439 -- Step 5: Add the declaration of the entry index and the associated
11440 -- type for barrier functions and entry families.
11442 if (Barrier and then Family)
11443 or else Ekind (Spec_Id) = E_Entry_Family
11446 E : constant Entity_Id := Index_Object (Spec_Id);
11447 Index : constant Entity_Id :=
11448 Defining_Identifier (
11449 Entry_Index_Specification (
11450 Entry_Body_Formal_Part (Body_Nod)));
11451 Index_Con : constant Entity_Id :=
11452 Make_Defining_Identifier (Loc, Chars (Index));
11454 Index_Typ : Entity_Id;
11458 -- Minimal decoration
11460 Set_Ekind (Index_Con, E_Constant);
11461 Set_Entry_Index_Constant (Index, Index_Con);
11462 Set_Discriminal_Link (Index_Con, Index);
11464 -- Retrieve the bounds of the entry family
11466 High := Type_High_Bound (Etype (Index));
11467 Low := Type_Low_Bound (Etype (Index));
11469 -- In the simple case the entry family is given by a subtype
11470 -- mark and the index constant has the same type.
11472 if Is_Entity_Name (Original_Node (
11473 Discrete_Subtype_Definition (Parent (Index))))
11475 Index_Typ := Etype (Index);
11477 -- Otherwise a new subtype declaration is required
11480 High := Replace_Bound (High);
11481 Low := Replace_Bound (Low);
11484 Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
11487 -- subtype Jnn is <Etype of Index> range Low .. High;
11490 Make_Subtype_Declaration (Loc,
11491 Defining_Identifier => Index_Typ,
11492 Subtype_Indication =>
11493 Make_Subtype_Indication (Loc,
11495 New_Reference_To (Base_Type (Etype (Index)), Loc),
11497 Make_Range_Constraint (Loc,
11498 Range_Expression =>
11499 Make_Range (Loc, Low, High))));
11503 Set_Etype (Index_Con, Index_Typ);
11505 -- Create the object which designates the index:
11506 -- J : constant Jnn :=
11507 -- Jnn'Val (_E - <index expr> + Jnn'Pos (Jnn'First));
11509 -- where Jnn is the subtype created above or the original type of
11510 -- the index, _E is a formal of the protected body subprogram and
11511 -- <index expr> is the index of the first family member.
11514 Make_Object_Declaration (Loc,
11515 Defining_Identifier => Index_Con,
11516 Constant_Present => True,
11517 Object_Definition =>
11518 New_Reference_To (Index_Typ, Loc),
11521 Make_Attribute_Reference (Loc,
11523 New_Reference_To (Index_Typ, Loc),
11524 Attribute_Name => Name_Val,
11526 Expressions => New_List (
11530 Make_Op_Subtract (Loc,
11532 New_Reference_To (E, Loc),
11534 Entry_Index_Expression (Loc,
11535 Defining_Identifier (Body_Nod),
11539 Make_Attribute_Reference (Loc,
11541 New_Reference_To (Index_Typ, Loc),
11542 Attribute_Name => Name_Pos,
11543 Expressions => New_List (
11544 Make_Attribute_Reference (Loc,
11546 New_Reference_To (Index_Typ, Loc),
11547 Attribute_Name => Name_First)))))));
11551 end Install_Private_Data_Declarations;
11553 ---------------------------------
11554 -- Is_Potentially_Large_Family --
11555 ---------------------------------
11557 function Is_Potentially_Large_Family
11558 (Base_Index : Entity_Id;
11559 Conctyp : Entity_Id;
11561 Hi : Node_Id) return Boolean
11564 return Scope (Base_Index) = Standard_Standard
11565 and then Base_Index = Base_Type (Standard_Integer)
11566 and then Has_Discriminants (Conctyp)
11568 (Discriminant_Default_Value (First_Discriminant (Conctyp)))
11570 (Denotes_Discriminant (Lo, True)
11571 or else Denotes_Discriminant (Hi, True));
11572 end Is_Potentially_Large_Family;
11574 -------------------------------------
11575 -- Is_Private_Primitive_Subprogram --
11576 -------------------------------------
11578 function Is_Private_Primitive_Subprogram (Id : Entity_Id) return Boolean is
11581 (Ekind (Id) = E_Function or else Ekind (Id) = E_Procedure)
11582 and then Is_Private_Primitive (Id);
11583 end Is_Private_Primitive_Subprogram;
11589 function Index_Object (Spec_Id : Entity_Id) return Entity_Id is
11590 Bod_Subp : constant Entity_Id := Protected_Body_Subprogram (Spec_Id);
11591 Formal : Entity_Id;
11594 Formal := First_Formal (Bod_Subp);
11595 while Present (Formal) loop
11597 -- Look for formal parameter _E
11599 if Chars (Formal) = Name_uE then
11603 Next_Formal (Formal);
11606 -- A protected body subprogram should always have the parameter in
11609 raise Program_Error;
11612 --------------------------------
11613 -- Make_Initialize_Protection --
11614 --------------------------------
11616 function Make_Initialize_Protection
11617 (Protect_Rec : Entity_Id) return List_Id
11619 Loc : constant Source_Ptr := Sloc (Protect_Rec);
11623 Ptyp : constant Node_Id :=
11624 Corresponding_Concurrent_Type (Protect_Rec);
11626 L : constant List_Id := New_List;
11627 Has_Entry : constant Boolean := Has_Entries (Ptyp);
11628 Restricted : constant Boolean := Restricted_Profile;
11631 -- We may need two calls to properly initialize the object, one to
11632 -- Initialize_Protection, and possibly one to Install_Handlers if we
11633 -- have a pragma Attach_Handler.
11635 -- Get protected declaration. In the case of a task type declaration,
11636 -- this is simply the parent of the protected type entity. In the single
11637 -- protected object declaration, this parent will be the implicit type,
11638 -- and we can find the corresponding single protected object declaration
11639 -- by searching forward in the declaration list in the tree.
11641 -- Is the test for N_Single_Protected_Declaration needed here??? Nodes
11642 -- of this type should have been removed during semantic analysis.
11644 Pdec := Parent (Ptyp);
11645 while not Nkind_In (Pdec, N_Protected_Type_Declaration,
11646 N_Single_Protected_Declaration)
11651 -- Now we can find the object definition from this declaration
11653 Pdef := Protected_Definition (Pdec);
11655 -- Build the parameter list for the call. Note that _Init is the name
11656 -- of the formal for the object to be initialized, which is the task
11657 -- value record itself.
11661 -- Object parameter. This is a pointer to the object of type
11662 -- Protection used by the GNARL to control the protected object.
11665 Make_Attribute_Reference (Loc,
11667 Make_Selected_Component (Loc,
11668 Prefix => Make_Identifier (Loc, Name_uInit),
11669 Selector_Name => Make_Identifier (Loc, Name_uObject)),
11670 Attribute_Name => Name_Unchecked_Access));
11672 -- Priority parameter. Set to Unspecified_Priority unless there is a
11673 -- priority pragma, in which case we take the value from the pragma,
11674 -- or there is an interrupt pragma and no priority pragma, and we
11675 -- set the ceiling to Interrupt_Priority'Last, an implementation-
11676 -- defined value, see D.3(10).
11679 and then Has_Priority_Pragma (Pdef)
11682 Prio : constant Node_Id :=
11685 (Pragma_Argument_Associations
11686 (Find_Task_Or_Protected_Pragma
11687 (Pdef, Name_Priority))));
11691 -- If priority is a static expression, then we can duplicate it
11692 -- with no problem and simply append it to the argument list.
11694 if Is_Static_Expression (Prio) then
11696 Duplicate_Subexpr_No_Checks (Prio));
11698 -- Otherwise, the priority may be a per-object expression, if it
11699 -- depends on a discriminant of the type. In this case, create
11700 -- local variable to capture the expression. Note that it is
11701 -- really necessary to create this variable explicitly. It might
11702 -- be thought that removing side effects would the appropriate
11703 -- approach, but that could generate declarations improperly
11704 -- placed in the enclosing scope.
11706 -- Note: Use System.Any_Priority as the expected type for the
11707 -- non-static priority expression, in case the expression has not
11708 -- been analyzed yet (as occurs for example with pragma
11709 -- Interrupt_Priority).
11713 Make_Defining_Identifier (Loc, New_Internal_Name ('R'));
11716 Make_Object_Declaration (Loc,
11717 Defining_Identifier => Temp,
11718 Object_Definition =>
11719 New_Occurrence_Of (RTE (RE_Any_Priority), Loc),
11720 Expression => Relocate_Node (Prio)));
11722 Append_To (Args, New_Occurrence_Of (Temp, Loc));
11726 -- When no priority is specified but an xx_Handler pragma is, we default
11727 -- to System.Interrupts.Default_Interrupt_Priority, see D.3(10).
11729 elsif Has_Interrupt_Handler (Ptyp)
11730 or else Has_Attach_Handler (Ptyp)
11733 New_Reference_To (RTE (RE_Default_Interrupt_Priority), Loc));
11735 -- Normal case, no priority or xx_Handler specified, default priority
11739 New_Reference_To (RTE (RE_Unspecified_Priority), Loc));
11742 -- Test for Compiler_Info parameter. This parameter allows entry body
11743 -- procedures and barrier functions to be called from the runtime. It
11744 -- is a pointer to the record generated by the compiler to represent
11745 -- the protected object.
11748 or else Has_Interrupt_Handler (Ptyp)
11749 or else Has_Attach_Handler (Ptyp)
11750 or else Has_Interfaces (Protect_Rec)
11753 Pkg_Id : constant RTU_Id :=
11754 Corresponding_Runtime_Package (Ptyp);
11755 Called_Subp : RE_Id;
11759 when System_Tasking_Protected_Objects_Entries =>
11760 Called_Subp := RE_Initialize_Protection_Entries;
11762 when System_Tasking_Protected_Objects =>
11763 Called_Subp := RE_Initialize_Protection;
11765 when System_Tasking_Protected_Objects_Single_Entry =>
11766 Called_Subp := RE_Initialize_Protection_Entry;
11769 raise Program_Error;
11772 if Has_Entry or else not Restricted then
11774 Make_Attribute_Reference (Loc,
11775 Prefix => Make_Identifier (Loc, Name_uInit),
11776 Attribute_Name => Name_Address));
11779 -- Entry_Bodies parameter. This is a pointer to an array of
11780 -- pointers to the entry body procedures and barrier functions of
11781 -- the object. If the protected type has no entries this object
11782 -- will not exist, in this case, pass a null.
11785 P_Arr := Entry_Bodies_Array (Ptyp);
11788 Make_Attribute_Reference (Loc,
11789 Prefix => New_Reference_To (P_Arr, Loc),
11790 Attribute_Name => Name_Unrestricted_Access));
11792 if Pkg_Id = System_Tasking_Protected_Objects_Entries then
11794 -- Find index mapping function (clumsy but ok for now)
11796 while Ekind (P_Arr) /= E_Function loop
11797 Next_Entity (P_Arr);
11801 Make_Attribute_Reference (Loc,
11803 New_Reference_To (P_Arr, Loc),
11804 Attribute_Name => Name_Unrestricted_Access));
11806 -- Build_Entry_Names generation flag. When set to true, the
11807 -- runtime will allocate an array to hold the string names
11808 -- of protected entries.
11810 if not Restricted_Profile then
11811 if Entry_Names_OK then
11813 New_Reference_To (Standard_True, Loc));
11816 New_Reference_To (Standard_False, Loc));
11821 elsif Pkg_Id = System_Tasking_Protected_Objects_Single_Entry then
11822 Append_To (Args, Make_Null (Loc));
11824 elsif Pkg_Id = System_Tasking_Protected_Objects_Entries then
11825 Append_To (Args, Make_Null (Loc));
11826 Append_To (Args, Make_Null (Loc));
11827 Append_To (Args, New_Reference_To (Standard_False, Loc));
11831 Make_Procedure_Call_Statement (Loc,
11832 Name => New_Reference_To (RTE (Called_Subp), Loc),
11833 Parameter_Associations => Args));
11837 Make_Procedure_Call_Statement (Loc,
11838 Name => New_Reference_To (RTE (RE_Initialize_Protection), Loc),
11839 Parameter_Associations => Args));
11842 if Has_Attach_Handler (Ptyp) then
11844 -- We have a list of N Attach_Handler (ProcI, ExprI), and we have to
11845 -- make the following call:
11847 -- Install_Handlers (_object,
11848 -- ((Expr1, Proc1'access), ...., (ExprN, ProcN'access));
11850 -- or, in the case of Ravenscar:
11852 -- Install_Restricted_Handlers
11853 -- ((Expr1, Proc1'access), ...., (ExprN, ProcN'access));
11856 Args : constant List_Id := New_List;
11857 Table : constant List_Id := New_List;
11858 Ritem : Node_Id := First_Rep_Item (Ptyp);
11861 -- Build the Attach_Handler table argument
11863 while Present (Ritem) loop
11864 if Nkind (Ritem) = N_Pragma
11865 and then Pragma_Name (Ritem) = Name_Attach_Handler
11868 Handler : constant Node_Id :=
11869 First (Pragma_Argument_Associations (Ritem));
11871 Interrupt : constant Node_Id := Next (Handler);
11872 Expr : constant Node_Id := Expression (Interrupt);
11876 Make_Aggregate (Loc, Expressions => New_List (
11877 Unchecked_Convert_To
11878 (RTE (RE_System_Interrupt_Id), Expr),
11879 Make_Attribute_Reference (Loc,
11880 Prefix => Make_Selected_Component (Loc,
11881 Make_Identifier (Loc, Name_uInit),
11882 Duplicate_Subexpr_No_Checks
11883 (Expression (Handler))),
11884 Attribute_Name => Name_Access))));
11888 Next_Rep_Item (Ritem);
11891 -- Append the table argument we just built
11893 Append_To (Args, Make_Aggregate (Loc, Table));
11895 -- Append the Install_Handlers (or Install_Restricted_Handlers)
11896 -- call to the statements.
11899 -- Call a simplified version of Install_Handlers to be used
11900 -- when the Ravenscar restrictions are in effect
11901 -- (Install_Restricted_Handlers).
11904 Make_Procedure_Call_Statement (Loc,
11907 (RTE (RE_Install_Restricted_Handlers), Loc),
11908 Parameter_Associations => Args));
11911 -- First, prepends the _object argument
11914 Make_Attribute_Reference (Loc,
11916 Make_Selected_Component (Loc,
11917 Prefix => Make_Identifier (Loc, Name_uInit),
11918 Selector_Name => Make_Identifier (Loc, Name_uObject)),
11919 Attribute_Name => Name_Unchecked_Access));
11921 -- Then, insert call to Install_Handlers
11924 Make_Procedure_Call_Statement (Loc,
11925 Name => New_Reference_To (RTE (RE_Install_Handlers), Loc),
11926 Parameter_Associations => Args));
11932 end Make_Initialize_Protection;
11934 ---------------------------
11935 -- Make_Task_Create_Call --
11936 ---------------------------
11938 function Make_Task_Create_Call (Task_Rec : Entity_Id) return Node_Id is
11939 Loc : constant Source_Ptr := Sloc (Task_Rec);
11949 Ttyp := Corresponding_Concurrent_Type (Task_Rec);
11950 Tnam := Chars (Ttyp);
11952 -- Get task declaration. In the case of a task type declaration, this is
11953 -- simply the parent of the task type entity. In the single task
11954 -- declaration, this parent will be the implicit type, and we can find
11955 -- the corresponding single task declaration by searching forward in the
11956 -- declaration list in the tree.
11958 -- Is the test for N_Single_Task_Declaration needed here??? Nodes of
11959 -- this type should have been removed during semantic analysis.
11961 Tdec := Parent (Ttyp);
11962 while not Nkind_In (Tdec, N_Task_Type_Declaration,
11963 N_Single_Task_Declaration)
11968 -- Now we can find the task definition from this declaration
11970 Tdef := Task_Definition (Tdec);
11972 -- Build the parameter list for the call. Note that _Init is the name
11973 -- of the formal for the object to be initialized, which is the task
11974 -- value record itself.
11978 -- Priority parameter. Set to Unspecified_Priority unless there is a
11979 -- priority pragma, in which case we take the value from the pragma.
11981 if Present (Tdef) and then Has_Priority_Pragma (Tdef) then
11983 Make_Selected_Component (Loc,
11984 Prefix => Make_Identifier (Loc, Name_uInit),
11985 Selector_Name => Make_Identifier (Loc, Name_uPriority)));
11988 New_Reference_To (RTE (RE_Unspecified_Priority), Loc));
11991 -- Optional Stack parameter
11993 if Restricted_Profile then
11995 -- If the stack has been preallocated by the expander then
11996 -- pass its address. Otherwise, pass a null address.
11998 if Preallocated_Stacks_On_Target then
12000 Make_Attribute_Reference (Loc,
12001 Prefix => Make_Selected_Component (Loc,
12002 Prefix => Make_Identifier (Loc, Name_uInit),
12004 Make_Identifier (Loc, Name_uStack)),
12005 Attribute_Name => Name_Address));
12009 New_Reference_To (RTE (RE_Null_Address), Loc));
12013 -- Size parameter. If no Storage_Size pragma is present, then
12014 -- the size is taken from the taskZ variable for the type, which
12015 -- is either Unspecified_Size, or has been reset by the use of
12016 -- a Storage_Size attribute definition clause. If a pragma is
12017 -- present, then the size is taken from the _Size field of the
12018 -- task value record, which was set from the pragma value.
12021 and then Has_Storage_Size_Pragma (Tdef)
12024 Make_Selected_Component (Loc,
12025 Prefix => Make_Identifier (Loc, Name_uInit),
12026 Selector_Name => Make_Identifier (Loc, Name_uSize)));
12030 New_Reference_To (Storage_Size_Variable (Ttyp), Loc));
12033 -- Task_Info parameter. Set to Unspecified_Task_Info unless there is a
12034 -- Task_Info pragma, in which case we take the value from the pragma.
12037 and then Has_Task_Info_Pragma (Tdef)
12040 Make_Selected_Component (Loc,
12041 Prefix => Make_Identifier (Loc, Name_uInit),
12042 Selector_Name => Make_Identifier (Loc, Name_uTask_Info)));
12046 New_Reference_To (RTE (RE_Unspecified_Task_Info), Loc));
12049 if not Restricted_Profile then
12051 -- Deadline parameter. If no Relative_Deadline pragma is present,
12052 -- then the deadline is Time_Span_Zero. If a pragma is present, then
12053 -- the deadline is taken from the _Relative_Deadline field of the
12054 -- task value record, which was set from the pragma value. Note that
12055 -- this parameter must not be generated for the restricted profiles
12056 -- since Ravenscar does not allow deadlines.
12058 -- Case where pragma Relative_Deadline applies: use given value
12060 if Present (Tdef) and then Has_Relative_Deadline_Pragma (Tdef) then
12062 Make_Selected_Component (Loc,
12063 Prefix => Make_Identifier (Loc, Name_uInit),
12065 Make_Identifier (Loc, Name_uRelative_Deadline)));
12067 -- No pragma Relative_Deadline apply to the task
12071 New_Reference_To (RTE (RE_Time_Span_Zero), Loc));
12074 -- Number of entries. This is an expression of the form:
12076 -- n + _Init.a'Length + _Init.a'B'Length + ...
12078 -- where a,b... are the entry family names for the task definition
12081 Build_Entry_Count_Expression
12086 (Parent (Corresponding_Record_Type (Ttyp))))),
12088 Append_To (Args, Ecount);
12090 -- Master parameter. This is a reference to the _Master parameter of
12091 -- the initialization procedure, except in the case of the pragma
12092 -- Restrictions (No_Task_Hierarchy) where the value is fixed to 3.
12093 -- See comments in System.Tasking.Initialization.Init_RTS for the
12096 if Restriction_Active (No_Task_Hierarchy) = False then
12097 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
12099 Append_To (Args, Make_Integer_Literal (Loc, 3));
12103 -- State parameter. This is a pointer to the task body procedure. The
12104 -- required value is obtained by taking 'Unrestricted_Access of the task
12105 -- body procedure and converting it (with an unchecked conversion) to
12106 -- the type required by the task kernel. For further details, see the
12107 -- description of Expand_N_Task_Body. We use 'Unrestricted_Access rather
12108 -- than 'Address in order to avoid creating trampolines.
12111 Body_Proc : constant Node_Id := Get_Task_Body_Procedure (Ttyp);
12112 Subp_Ptr_Typ : constant Node_Id :=
12113 Create_Itype (E_Access_Subprogram_Type, Tdec);
12114 Ref : constant Node_Id := Make_Itype_Reference (Loc);
12117 Set_Directly_Designated_Type (Subp_Ptr_Typ, Body_Proc);
12118 Set_Etype (Subp_Ptr_Typ, Subp_Ptr_Typ);
12120 -- Be sure to freeze a reference to the access-to-subprogram type,
12121 -- otherwise gigi will complain that it's in the wrong scope, because
12122 -- it's actually inside the init procedure for the record type that
12123 -- corresponds to the task type.
12125 -- This processing is causing a crash in the .NET/JVM back ends that
12126 -- is not yet understood, so skip it in these cases ???
12128 if VM_Target = No_VM then
12129 Set_Itype (Ref, Subp_Ptr_Typ);
12130 Append_Freeze_Action (Task_Rec, Ref);
12133 Unchecked_Convert_To (RTE (RE_Task_Procedure_Access),
12134 Make_Qualified_Expression (Loc,
12135 Subtype_Mark => New_Reference_To (Subp_Ptr_Typ, Loc),
12137 Make_Attribute_Reference (Loc,
12139 New_Occurrence_Of (Body_Proc, Loc),
12140 Attribute_Name => Name_Unrestricted_Access))));
12142 -- For the .NET/JVM cases revert to the original code below ???
12146 Unchecked_Convert_To (RTE (RE_Task_Procedure_Access),
12147 Make_Attribute_Reference (Loc,
12149 New_Occurrence_Of (Body_Proc, Loc),
12150 Attribute_Name => Name_Address)));
12154 -- Discriminants parameter. This is just the address of the task
12155 -- value record itself (which contains the discriminant values
12158 Make_Attribute_Reference (Loc,
12159 Prefix => Make_Identifier (Loc, Name_uInit),
12160 Attribute_Name => Name_Address));
12162 -- Elaborated parameter. This is an access to the elaboration Boolean
12165 Make_Attribute_Reference (Loc,
12166 Prefix => Make_Identifier (Loc, New_External_Name (Tnam, 'E')),
12167 Attribute_Name => Name_Unchecked_Access));
12169 -- Chain parameter. This is a reference to the _Chain parameter of
12170 -- the initialization procedure.
12172 Append_To (Args, Make_Identifier (Loc, Name_uChain));
12174 -- Task name parameter. Take this from the _Task_Id parameter to the
12175 -- init call unless there is a Task_Name pragma, in which case we take
12176 -- the value from the pragma.
12179 and then Has_Task_Name_Pragma (Tdef)
12181 -- Copy expression in full, because it may be dynamic and have
12187 (Pragma_Argument_Associations
12188 (Find_Task_Or_Protected_Pragma
12189 (Tdef, Name_Task_Name))))));
12192 Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
12195 -- Created_Task parameter. This is the _Task_Id field of the task
12199 Make_Selected_Component (Loc,
12200 Prefix => Make_Identifier (Loc, Name_uInit),
12201 Selector_Name => Make_Identifier (Loc, Name_uTask_Id)));
12203 -- Build_Entry_Names generation flag. When set to true, the runtime
12204 -- will allocate an array to hold the string names of task entries.
12206 if not Restricted_Profile then
12207 if Has_Entries (Ttyp)
12208 and then Entry_Names_OK
12210 Append_To (Args, New_Reference_To (Standard_True, Loc));
12212 Append_To (Args, New_Reference_To (Standard_False, Loc));
12216 if Restricted_Profile then
12217 Name := New_Reference_To (RTE (RE_Create_Restricted_Task), Loc);
12219 Name := New_Reference_To (RTE (RE_Create_Task), Loc);
12223 Make_Procedure_Call_Statement (Loc,
12225 Parameter_Associations => Args);
12226 end Make_Task_Create_Call;
12228 ------------------------------
12229 -- Next_Protected_Operation --
12230 ------------------------------
12232 function Next_Protected_Operation (N : Node_Id) return Node_Id is
12236 Next_Op := Next (N);
12237 while Present (Next_Op)
12238 and then not Nkind_In (Next_Op, N_Subprogram_Body, N_Entry_Body)
12244 end Next_Protected_Operation;
12246 ---------------------
12247 -- Null_Statements --
12248 ---------------------
12250 function Null_Statements (Stats : List_Id) return Boolean is
12254 Stmt := First (Stats);
12255 while Nkind (Stmt) /= N_Empty
12256 and then (Nkind_In (Stmt, N_Null_Statement, N_Label)
12258 (Nkind (Stmt) = N_Pragma
12259 and then (Pragma_Name (Stmt) = Name_Unreferenced
12261 Pragma_Name (Stmt) = Name_Unmodified
12263 Pragma_Name (Stmt) = Name_Warnings)))
12268 return Nkind (Stmt) = N_Empty;
12269 end Null_Statements;
12271 --------------------------
12272 -- Parameter_Block_Pack --
12273 --------------------------
12275 function Parameter_Block_Pack
12277 Blk_Typ : Entity_Id;
12281 Stmts : List_Id) return Node_Id
12283 Actual : Entity_Id;
12284 Expr : Node_Id := Empty;
12285 Formal : Entity_Id;
12286 Has_Param : Boolean := False;
12289 Temp_Asn : Node_Id;
12290 Temp_Nam : Node_Id;
12293 Actual := First (Actuals);
12294 Formal := Defining_Identifier (First (Formals));
12295 Params := New_List;
12297 while Present (Actual) loop
12298 if Is_By_Copy_Type (Etype (Actual)) then
12300 -- Jnn : aliased <formal-type>
12303 Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
12306 Make_Object_Declaration (Loc,
12309 Defining_Identifier =>
12311 Object_Definition =>
12312 New_Reference_To (Etype (Formal), Loc)));
12314 if Ekind (Formal) /= E_Out_Parameter then
12320 New_Reference_To (Temp_Nam, Loc);
12322 Set_Assignment_OK (Temp_Asn);
12325 Make_Assignment_Statement (Loc,
12329 New_Copy_Tree (Actual)));
12333 -- Jnn'unchecked_access
12336 Make_Attribute_Reference (Loc,
12338 Name_Unchecked_Access,
12340 New_Reference_To (Temp_Nam, Loc)));
12344 -- The controlling parameter is omitted
12347 if not Is_Controlling_Actual (Actual) then
12349 Make_Reference (Loc, New_Copy_Tree (Actual)));
12355 Next_Actual (Actual);
12356 Next_Formal_With_Extras (Formal);
12360 Expr := Make_Aggregate (Loc, Params);
12365 -- J1'unchecked_access;
12366 -- <actual2>'reference;
12369 P := Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
12372 Make_Object_Declaration (Loc,
12373 Defining_Identifier =>
12375 Object_Definition =>
12376 New_Reference_To (Blk_Typ, Loc),
12381 end Parameter_Block_Pack;
12383 ----------------------------
12384 -- Parameter_Block_Unpack --
12385 ----------------------------
12387 function Parameter_Block_Unpack
12391 Formals : List_Id) return List_Id
12393 Actual : Entity_Id;
12395 Formal : Entity_Id;
12396 Has_Asnmt : Boolean := False;
12397 Result : constant List_Id := New_List;
12400 Actual := First (Actuals);
12401 Formal := Defining_Identifier (First (Formals));
12402 while Present (Actual) loop
12403 if Is_By_Copy_Type (Etype (Actual))
12404 and then Ekind (Formal) /= E_In_Parameter
12407 -- <actual> := P.<formal>;
12410 Make_Assignment_Statement (Loc,
12414 Make_Explicit_Dereference (Loc,
12415 Make_Selected_Component (Loc,
12417 New_Reference_To (P, Loc),
12419 Make_Identifier (Loc, Chars (Formal)))));
12421 Set_Assignment_OK (Name (Asnmt));
12422 Append_To (Result, Asnmt);
12427 Next_Actual (Actual);
12428 Next_Formal_With_Extras (Formal);
12434 return New_List (Make_Null_Statement (Loc));
12436 end Parameter_Block_Unpack;
12438 ----------------------
12439 -- Set_Discriminals --
12440 ----------------------
12442 procedure Set_Discriminals (Dec : Node_Id) is
12445 D_Minal : Entity_Id;
12448 pragma Assert (Nkind (Dec) = N_Protected_Type_Declaration);
12449 Pdef := Defining_Identifier (Dec);
12451 if Has_Discriminants (Pdef) then
12452 D := First_Discriminant (Pdef);
12453 while Present (D) loop
12455 Make_Defining_Identifier (Sloc (D),
12456 Chars => New_External_Name (Chars (D), 'D'));
12458 Set_Ekind (D_Minal, E_Constant);
12459 Set_Etype (D_Minal, Etype (D));
12460 Set_Scope (D_Minal, Pdef);
12461 Set_Discriminal (D, D_Minal);
12462 Set_Discriminal_Link (D_Minal, D);
12464 Next_Discriminant (D);
12467 end Set_Discriminals;
12469 -----------------------
12470 -- Trivial_Accept_OK --
12471 -----------------------
12473 function Trivial_Accept_OK return Boolean is
12475 case Opt.Task_Dispatching_Policy is
12477 -- If we have the default task dispatching policy in effect, we can
12478 -- definitely do the optimization (one way of looking at this is to
12479 -- think of the formal definition of the default policy being allowed
12480 -- to run any task it likes after a rendezvous, so even if notionally
12481 -- a full rescheduling occurs, we can say that our dispatching policy
12482 -- (i.e. the default dispatching policy) reorders the queue to be the
12483 -- same as just before the call.
12488 -- FIFO_Within_Priorities certainly does not permit this
12489 -- optimization since the Rendezvous is a scheduling action that may
12490 -- require some other task to be run.
12495 -- For now, disallow the optimization for all other policies. This
12496 -- may be over-conservative, but it is certainly not incorrect.
12502 end Trivial_Accept_OK;
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