1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Checks; use Checks;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Exp_Ch3; use Exp_Ch3;
33 with Exp_Ch11; use Exp_Ch11;
34 with Exp_Ch6; use Exp_Ch6;
35 with Exp_Dbug; use Exp_Dbug;
36 with Exp_Smem; use Exp_Smem;
37 with Exp_Tss; use Exp_Tss;
38 with Exp_Util; use Exp_Util;
39 with Freeze; use Freeze;
41 with Namet; use Namet;
42 with Nlists; use Nlists;
43 with Nmake; use Nmake;
45 with Restrict; use Restrict;
46 with Rident; use Rident;
47 with Rtsfind; use Rtsfind;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Ch11; use Sem_Ch11;
52 with Sem_Elab; use Sem_Elab;
53 with Sem_Res; use Sem_Res;
54 with Sem_Util; use Sem_Util;
55 with Sinfo; use Sinfo;
56 with Snames; use Snames;
57 with Stand; use Stand;
58 with Tbuild; use Tbuild;
59 with Types; use Types;
60 with Uintp; use Uintp;
63 package body Exp_Ch9 is
65 -----------------------
66 -- Local Subprograms --
67 -----------------------
69 function Actual_Index_Expression
73 Tsk : Entity_Id) return Node_Id;
74 -- Compute the index position for an entry call. Tsk is the target
75 -- task. If the bounds of some entry family depend on discriminants,
76 -- the expression computed by this function uses the discriminants
77 -- of the target task.
79 function Index_Constant_Declaration
82 Prot : Entity_Id) return List_Id;
83 -- For an entry family and its barrier function, we define a local entity
84 -- that maps the index in the call into the entry index into the object:
86 -- I : constant Index_Type := Index_Type'Val (
87 -- E - <<index of first family member>> +
88 -- Protected_Entry_Index (Index_Type'Pos (Index_Type'First)));
90 procedure Add_Object_Pointer
94 -- Prepend an object pointer declaration to the declaration list
95 -- Decls. This object pointer is initialized to a type conversion
96 -- of the System.Address pointer passed to entry barrier functions
97 -- and entry body procedures.
99 function Build_Accept_Body (Astat : Node_Id) return Node_Id;
100 -- Transform accept statement into a block with added exception handler.
101 -- Used both for simple accept statements and for accept alternatives in
102 -- select statements. Astat is the accept statement.
104 function Build_Barrier_Function
107 Pid : Node_Id) return Node_Id;
108 -- Build the function body returning the value of the barrier expression
109 -- for the specified entry body.
111 function Build_Barrier_Function_Specification
113 Loc : Source_Ptr) return Node_Id;
114 -- Build a specification for a function implementing
115 -- the protected entry barrier of the specified entry body.
117 function Build_Corresponding_Record
120 Loc : Source_Ptr) return Node_Id;
121 -- Common to tasks and protected types. Copy discriminant specifications,
122 -- build record declaration. N is the type declaration, Ctyp is the
123 -- concurrent entity (task type or protected type).
125 function Build_Entry_Count_Expression
126 (Concurrent_Type : Node_Id;
127 Component_List : List_Id;
128 Loc : Source_Ptr) return Node_Id;
129 -- Compute number of entries for concurrent object. This is a count of
130 -- simple entries, followed by an expression that computes the length
131 -- of the range of each entry family. A single array with that size is
132 -- allocated for each concurrent object of the type.
134 function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id;
135 -- Build the function that translates the entry index in the call
136 -- (which depends on the size of entry families) into an index into the
137 -- Entry_Bodies_Array, to determine the body and barrier function used
138 -- in a protected entry call. A pointer to this function appears in every
141 function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id;
142 -- Build subprogram declaration for previous one
144 function Build_Protected_Entry
147 Pid : Node_Id) return Node_Id;
148 -- Build the procedure implementing the statement sequence of
149 -- the specified entry body.
151 function Build_Protected_Entry_Specification
154 Loc : Source_Ptr) return Node_Id;
155 -- Build a specification for a procedure implementing
156 -- the statement sequence of the specified entry body.
157 -- Add attributes associating it with the entry defining identifier
160 function Build_Protected_Subprogram_Body
163 N_Op_Spec : Node_Id) return Node_Id;
164 -- This function is used to construct the protected version of a protected
165 -- subprogram. Its statement sequence first defers abortion, then locks
166 -- the associated protected object, and then enters a block that contains
167 -- a call to the unprotected version of the subprogram (for details, see
168 -- Build_Unprotected_Subprogram_Body). This block statement requires
169 -- a cleanup handler that unlocks the object in all cases.
170 -- (see Exp_Ch7.Expand_Cleanup_Actions).
172 function Build_Protected_Spec
174 Obj_Type : Entity_Id;
175 Unprotected : Boolean := False;
176 Ident : Entity_Id) return List_Id;
177 -- Utility shared by Build_Protected_Sub_Spec and Expand_Access_Protected_
178 -- Subprogram_Type. Builds signature of protected subprogram, adding the
179 -- formal that corresponds to the object itself. For an access to protected
180 -- subprogram, there is no object type to specify, so the additional
181 -- parameter has type Address and mode In. An indirect call through such
182 -- a pointer converts the address to a reference to the actual object.
183 -- The object is a limited record and therefore a by_reference type.
185 function Build_Selected_Name
186 (Prefix, Selector : Name_Id;
187 Append_Char : Character := ' ') return Name_Id;
188 -- Build a name in the form of Prefix__Selector, with an optional
189 -- character appended. This is used for internal subprograms generated
190 -- for operations of protected types, including barrier functions. In
191 -- order to simplify the work of the debugger, the prefix includes the
192 -- characters PT. For the subprograms generated for entry bodies and
193 -- entry barriers, the generated name includes a sequence number that
194 -- makes names unique in the presence of entry overloading. This is
195 -- necessary because entry body procedures and barrier functions all
196 -- have the same signature.
198 procedure Build_Simple_Entry_Call
203 -- Some comments here would be useful ???
205 function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id;
206 -- This routine constructs a specification for the procedure that we will
207 -- build for the task body for task type T. The spec has the form:
209 -- procedure tnameB (_Task : access tnameV);
211 -- where name is the character name taken from the task type entity that
212 -- is passed as the argument to the procedure, and tnameV is the task
213 -- value type that is associated with the task type.
215 function Build_Unprotected_Subprogram_Body
217 Pid : Node_Id) return Node_Id;
218 -- This routine constructs the unprotected version of a protected
219 -- subprogram body, which is contains all of the code in the
220 -- original, unexpanded body. This is the version of the protected
221 -- subprogram that is called from all protected operations on the same
222 -- object, including the protected version of the same subprogram.
224 procedure Collect_Entry_Families
227 Current_Node : in out Node_Id;
228 Conctyp : Entity_Id);
229 -- For each entry family in a concurrent type, create an anonymous array
230 -- type of the right size, and add a component to the corresponding_record.
232 function Family_Offset
236 Ttyp : Entity_Id) return Node_Id;
237 -- Compute (Hi - Lo) for two entry family indices. Hi is the index in
238 -- an accept statement, or the upper bound in the discrete subtype of
239 -- an entry declaration. Lo is the corresponding lower bound. Ttyp is
240 -- the concurrent type of the entry.
246 Ttyp : Entity_Id) return Node_Id;
247 -- Compute (Hi - Lo) + 1 Max 0, to determine the number of entries in
248 -- a family, and handle properly the superflat case. This is equivalent
249 -- to the use of 'Length on the index type, but must use Family_Offset
250 -- to handle properly the case of bounds that depend on discriminants.
252 procedure Extract_Entry
254 Concval : out Node_Id;
256 Index : out Node_Id);
257 -- Given an entry call, returns the associated concurrent object,
258 -- the entry name, and the entry family index.
260 function Find_Task_Or_Protected_Pragma
262 P : Name_Id) return Node_Id;
263 -- Searches the task or protected definition T for the first occurrence
264 -- of the pragma whose name is given by P. The caller has ensured that
265 -- the pragma is present in the task definition. A special case is that
266 -- when P is Name_uPriority, the call will also find Interrupt_Priority.
267 -- ??? Should be implemented with the rep item chain mechanism.
269 procedure Update_Prival_Subtypes (N : Node_Id);
270 -- The actual subtypes of the privals will differ from the type of the
271 -- private declaration in the original protected type, if the protected
272 -- type has discriminants or if the prival has constrained components.
273 -- This is because the privals are generated out of sequence w.r.t. the
274 -- analysis of a protected body. After generating the bodies for protected
275 -- operations, we set correctly the type of all references to privals, by
276 -- means of a recursive tree traversal, which is heavy-handed but
279 -----------------------------
280 -- Actual_Index_Expression --
281 -----------------------------
283 function Actual_Index_Expression
287 Tsk : Entity_Id) return Node_Id
289 Ttyp : constant Entity_Id := Etype (Tsk);
297 function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id;
298 -- Compute difference between bounds of entry family.
300 --------------------------
301 -- Actual_Family_Offset --
302 --------------------------
304 function Actual_Family_Offset (Hi, Lo : Node_Id) return Node_Id is
306 function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id;
307 -- Replace a reference to a discriminant with a selected component
308 -- denoting the discriminant of the target task.
310 -----------------------------
311 -- Actual_Discriminant_Ref --
312 -----------------------------
314 function Actual_Discriminant_Ref (Bound : Node_Id) return Node_Id is
315 Typ : constant Entity_Id := Etype (Bound);
319 if not Is_Entity_Name (Bound)
320 or else Ekind (Entity (Bound)) /= E_Discriminant
322 if Nkind (Bound) = N_Attribute_Reference then
325 B := New_Copy_Tree (Bound);
330 Make_Selected_Component (Sloc,
331 Prefix => New_Copy_Tree (Tsk),
332 Selector_Name => New_Occurrence_Of (Entity (Bound), Sloc));
334 Analyze_And_Resolve (B, Typ);
338 Make_Attribute_Reference (Sloc,
339 Attribute_Name => Name_Pos,
340 Prefix => New_Occurrence_Of (Etype (Bound), Sloc),
341 Expressions => New_List (B));
342 end Actual_Discriminant_Ref;
344 -- Start of processing for Actual_Family_Offset
348 Make_Op_Subtract (Sloc,
349 Left_Opnd => Actual_Discriminant_Ref (Hi),
350 Right_Opnd => Actual_Discriminant_Ref (Lo));
351 end Actual_Family_Offset;
353 -- Start of processing for Actual_Index_Expression
356 -- The queues of entries and entry families appear in textual
357 -- order in the associated record. The entry index is computed as
358 -- the sum of the number of queues for all entries that precede the
359 -- designated one, to which is added the index expression, if this
360 -- expression denotes a member of a family.
362 -- The following is a place holder for the count of simple entries.
364 Num := Make_Integer_Literal (Sloc, 1);
366 -- We construct an expression which is a series of addition
367 -- operations. See comments in Entry_Index_Expression, which is
368 -- identical in structure.
370 if Present (Index) then
371 S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
378 Actual_Family_Offset (
379 Make_Attribute_Reference (Sloc,
380 Attribute_Name => Name_Pos,
381 Prefix => New_Reference_To (Base_Type (S), Sloc),
382 Expressions => New_List (Relocate_Node (Index))),
383 Type_Low_Bound (S)));
388 -- Now add lengths of preceding entries and entry families.
390 Prev := First_Entity (Ttyp);
392 while Chars (Prev) /= Chars (Ent)
393 or else (Ekind (Prev) /= Ekind (Ent))
394 or else not Sem_Ch6.Type_Conformant (Ent, Prev)
396 if Ekind (Prev) = E_Entry then
397 Set_Intval (Num, Intval (Num) + 1);
399 elsif Ekind (Prev) = E_Entry_Family then
401 Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
402 Lo := Type_Low_Bound (S);
403 Hi := Type_High_Bound (S);
411 Actual_Family_Offset (Hi, Lo),
413 Make_Integer_Literal (Sloc, 1)));
415 -- Other components are anonymous types to be ignored.
425 end Actual_Index_Expression;
427 ----------------------------------
428 -- Add_Discriminal_Declarations --
429 ----------------------------------
431 procedure Add_Discriminal_Declarations
440 if Has_Discriminants (Typ) then
441 D := First_Discriminant (Typ);
443 while Present (D) loop
446 Make_Object_Renaming_Declaration (Loc,
447 Defining_Identifier => Discriminal (D),
448 Subtype_Mark => New_Reference_To (Etype (D), Loc),
450 Make_Selected_Component (Loc,
451 Prefix => Make_Identifier (Loc, Name),
452 Selector_Name => Make_Identifier (Loc, Chars (D)))));
454 Next_Discriminant (D);
457 end Add_Discriminal_Declarations;
459 ------------------------
460 -- Add_Object_Pointer --
461 ------------------------
463 procedure Add_Object_Pointer
471 -- Prepend the declaration of _object. This must be first in the
472 -- declaration list, since it is used by the discriminal and
473 -- prival declarations.
474 -- ??? An attempt to make this a renaming was unsuccessful.
476 -- type poVP is access poV;
477 -- _object : poVP := poVP!O;
480 Make_Defining_Identifier (Loc,
483 (Chars (Corresponding_Record_Type (Pid)), 'P'));
486 Make_Object_Declaration (Loc,
487 Defining_Identifier =>
488 Make_Defining_Identifier (Loc, Name_uObject),
489 Object_Definition => New_Reference_To (Obj_Ptr, Loc),
491 Unchecked_Convert_To (Obj_Ptr,
492 Make_Identifier (Loc, Name_uO))));
495 Make_Full_Type_Declaration (Loc,
496 Defining_Identifier => Obj_Ptr,
497 Type_Definition => Make_Access_To_Object_Definition (Loc,
498 Subtype_Indication =>
499 New_Reference_To (Corresponding_Record_Type (Pid), Loc))));
500 end Add_Object_Pointer;
502 ------------------------------
503 -- Add_Private_Declarations --
504 ------------------------------
506 procedure Add_Private_Declarations
512 Def : constant Node_Id := Protected_Definition (Parent (Typ));
513 Body_Ent : constant Entity_Id := Corresponding_Body (Parent (Typ));
518 pragma Assert (Nkind (Def) = N_Protected_Definition);
520 if Present (Private_Declarations (Def)) then
521 P := First (Private_Declarations (Def));
523 while Present (P) loop
524 if Nkind (P) = N_Component_Declaration then
525 Pdef := Defining_Identifier (P);
527 Make_Object_Renaming_Declaration (Loc,
528 Defining_Identifier => Prival (Pdef),
529 Subtype_Mark => New_Reference_To (Etype (Pdef), Loc),
531 Make_Selected_Component (Loc,
532 Prefix => Make_Identifier (Loc, Name),
533 Selector_Name => Make_Identifier (Loc, Chars (Pdef)))));
539 -- One more "prival" for the object itself, with the right protection
543 Protection_Type : RE_Id;
545 if Has_Attach_Handler (Typ) then
546 if Restricted_Profile then
547 if Has_Entries (Typ) then
548 Protection_Type := RE_Protection_Entry;
550 Protection_Type := RE_Protection;
553 Protection_Type := RE_Static_Interrupt_Protection;
556 elsif Has_Interrupt_Handler (Typ) then
557 Protection_Type := RE_Dynamic_Interrupt_Protection;
559 elsif Has_Entries (Typ) then
561 or else Restriction_Active (No_Entry_Queue) = False
562 or else Number_Entries (Typ) > 1
564 Protection_Type := RE_Protection_Entries;
566 Protection_Type := RE_Protection_Entry;
570 Protection_Type := RE_Protection;
574 Make_Object_Renaming_Declaration (Loc,
575 Defining_Identifier => Object_Ref (Body_Ent),
576 Subtype_Mark => New_Reference_To (RTE (Protection_Type), Loc),
578 Make_Selected_Component (Loc,
579 Prefix => Make_Identifier (Loc, Name),
580 Selector_Name => Make_Identifier (Loc, Name_uObject))));
582 end Add_Private_Declarations;
584 -----------------------
585 -- Build_Accept_Body --
586 -----------------------
588 function Build_Accept_Body (Astat : Node_Id) return Node_Id is
589 Loc : constant Source_Ptr := Sloc (Astat);
590 Stats : constant Node_Id := Handled_Statement_Sequence (Astat);
597 -- At the end of the statement sequence, Complete_Rendezvous is called.
598 -- A label skipping the Complete_Rendezvous, and all other
599 -- accept processing, has already been added for the expansion
600 -- of requeue statements.
602 Call := Build_Runtime_Call (Loc, RE_Complete_Rendezvous);
603 Insert_Before (Last (Statements (Stats)), Call);
606 -- If exception handlers are present, then append Complete_Rendezvous
607 -- calls to the handlers, and construct the required outer block.
609 if Present (Exception_Handlers (Stats)) then
610 Hand := First (Exception_Handlers (Stats));
612 while Present (Hand) loop
613 Call := Build_Runtime_Call (Loc, RE_Complete_Rendezvous);
614 Append (Call, Statements (Hand));
620 Make_Handled_Sequence_Of_Statements (Loc,
621 Statements => New_List (
622 Make_Block_Statement (Loc,
623 Handled_Statement_Sequence => Stats)));
629 -- At this stage we know that the new statement sequence does not
630 -- have an exception handler part, so we supply one to call
631 -- Exceptional_Complete_Rendezvous. This handler is
633 -- when all others =>
634 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
636 -- We handle Abort_Signal to make sure that we properly catch the abort
637 -- case and wake up the caller.
639 Ohandle := Make_Others_Choice (Loc);
640 Set_All_Others (Ohandle);
642 Set_Exception_Handlers (New_S,
644 Make_Exception_Handler (Loc,
645 Exception_Choices => New_List (Ohandle),
647 Statements => New_List (
648 Make_Procedure_Call_Statement (Loc,
649 Name => New_Reference_To (
650 RTE (RE_Exceptional_Complete_Rendezvous), Loc),
651 Parameter_Associations => New_List (
652 Make_Function_Call (Loc,
653 Name => New_Reference_To (
654 RTE (RE_Get_GNAT_Exception), Loc))))))));
656 Set_Parent (New_S, Astat); -- temp parent for Analyze call
657 Analyze_Exception_Handlers (Exception_Handlers (New_S));
658 Expand_Exception_Handlers (New_S);
660 -- Exceptional_Complete_Rendezvous must be called with abort
661 -- still deferred, which is the case for a "when all others" handler.
664 end Build_Accept_Body;
666 -----------------------------------
667 -- Build_Activation_Chain_Entity --
668 -----------------------------------
670 procedure Build_Activation_Chain_Entity (N : Node_Id) is
676 -- Loop to find enclosing construct containing activation chain variable
680 while Nkind (P) /= N_Subprogram_Body
681 and then Nkind (P) /= N_Package_Declaration
682 and then Nkind (P) /= N_Package_Body
683 and then Nkind (P) /= N_Block_Statement
684 and then Nkind (P) /= N_Task_Body
689 -- If we are in a package body, the activation chain variable is
690 -- allocated in the corresponding spec. First, we save the package
691 -- body node because we enter the new entity in its Declarations list.
695 if Nkind (P) = N_Package_Body then
696 P := Unit_Declaration_Node (Corresponding_Spec (P));
697 Decls := Declarations (B);
699 elsif Nkind (P) = N_Package_Declaration then
700 Decls := Visible_Declarations (Specification (B));
703 Decls := Declarations (B);
706 -- If activation chain entity not already declared, declare it
708 if No (Activation_Chain_Entity (P)) then
709 Set_Activation_Chain_Entity
710 (P, Make_Defining_Identifier (Sloc (N), Name_uChain));
713 Make_Object_Declaration (Sloc (P),
714 Defining_Identifier => Activation_Chain_Entity (P),
715 Aliased_Present => True,
717 New_Reference_To (RTE (RE_Activation_Chain), Sloc (P))));
719 Analyze (First (Decls));
721 end Build_Activation_Chain_Entity;
723 ----------------------------
724 -- Build_Barrier_Function --
725 ----------------------------
727 function Build_Barrier_Function
730 Pid : Node_Id) return Node_Id
732 Loc : constant Source_Ptr := Sloc (N);
733 Ent_Formals : constant Node_Id := Entry_Body_Formal_Part (N);
734 Index_Spec : constant Node_Id := Entry_Index_Specification
736 Op_Decls : constant List_Id := New_List;
742 Make_Defining_Identifier (Loc, Chars (Barrier_Function (Ent)));
743 Bspec := Build_Barrier_Function_Specification (Bdef, Loc);
745 -- <object pointer declaration>
746 -- <discriminant renamings>
747 -- <private object renamings>
748 -- Add discriminal and private renamings. These names have
749 -- already been used to expand references to discriminants
752 Add_Discriminal_Declarations (Op_Decls, Pid, Name_uObject, Loc);
753 Add_Private_Declarations (Op_Decls, Pid, Name_uObject, Loc);
754 Add_Object_Pointer (Op_Decls, Pid, Loc);
756 -- If this is the barrier for an entry family, the entry index is
757 -- visible in the body of the barrier. Create a local variable that
758 -- converts the entry index (which is the last formal of the barrier
759 -- function) into the appropriate offset into the entry array. The
760 -- entry index constant must be set, as for the entry body, so that
761 -- local references to the entry index are correctly replaced with
762 -- the local variable. This parallels what is done for entry bodies.
764 if Present (Index_Spec) then
766 Index_Id : constant Entity_Id := Defining_Identifier (Index_Spec);
767 Index_Con : constant Entity_Id :=
768 Make_Defining_Identifier (Loc,
769 Chars => New_Internal_Name ('J'));
772 Set_Entry_Index_Constant (Index_Id, Index_Con);
773 Append_List_To (Op_Decls,
774 Index_Constant_Declaration (N, Index_Id, Pid));
778 -- Note: the condition in the barrier function needs to be properly
779 -- processed for the C/Fortran boolean possibility, but this happens
780 -- automatically since the return statement does this normalization.
783 Make_Subprogram_Body (Loc,
784 Specification => Bspec,
785 Declarations => Op_Decls,
786 Handled_Statement_Sequence =>
787 Make_Handled_Sequence_Of_Statements (Loc,
788 Statements => New_List (
789 Make_Return_Statement (Loc,
790 Expression => Condition (Ent_Formals)))));
791 end Build_Barrier_Function;
793 ------------------------------------------
794 -- Build_Barrier_Function_Specification --
795 ------------------------------------------
797 function Build_Barrier_Function_Specification
799 Loc : Source_Ptr) return Node_Id
802 return Make_Function_Specification (Loc,
803 Defining_Unit_Name => Def_Id,
804 Parameter_Specifications => New_List (
805 Make_Parameter_Specification (Loc,
806 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uO),
808 New_Reference_To (RTE (RE_Address), Loc)),
810 Make_Parameter_Specification (Loc,
811 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uE),
813 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))),
815 Subtype_Mark => New_Reference_To (Standard_Boolean, Loc));
816 end Build_Barrier_Function_Specification;
818 --------------------------
819 -- Build_Call_With_Task --
820 --------------------------
822 function Build_Call_With_Task
824 E : Entity_Id) return Node_Id
826 Loc : constant Source_Ptr := Sloc (N);
830 Make_Function_Call (Loc,
831 Name => New_Reference_To (E, Loc),
832 Parameter_Associations => New_List (Concurrent_Ref (N)));
833 end Build_Call_With_Task;
835 --------------------------------
836 -- Build_Corresponding_Record --
837 --------------------------------
839 function Build_Corresponding_Record
842 Loc : Source_Ptr) return Node_Id
844 Rec_Ent : constant Entity_Id :=
845 Make_Defining_Identifier
846 (Loc, New_External_Name (Chars (Ctyp), 'V'));
849 New_Disc : Entity_Id;
853 Set_Corresponding_Record_Type (Ctyp, Rec_Ent);
854 Set_Ekind (Rec_Ent, E_Record_Type);
855 Set_Has_Delayed_Freeze (Rec_Ent, Has_Delayed_Freeze (Ctyp));
856 Set_Is_Concurrent_Record_Type (Rec_Ent, True);
857 Set_Corresponding_Concurrent_Type (Rec_Ent, Ctyp);
858 Set_Stored_Constraint (Rec_Ent, No_Elist);
861 -- Use discriminals to create list of discriminants for record, and
862 -- create new discriminals for use in default expressions, etc. It is
863 -- worth noting that a task discriminant gives rise to 5 entities;
865 -- a) The original discriminant.
866 -- b) The discriminal for use in the task.
867 -- c) The discriminant of the corresponding record.
868 -- d) The discriminal for the init proc of the corresponding record.
869 -- e) The local variable that renames the discriminant in the procedure
870 -- for the task body.
872 -- In fact the discriminals b) are used in the renaming declarations
873 -- for e). See details in einfo (Handling of Discriminants).
875 if Present (Discriminant_Specifications (N)) then
877 Disc := First_Discriminant (Ctyp);
879 while Present (Disc) loop
880 New_Disc := CR_Discriminant (Disc);
883 Make_Discriminant_Specification (Loc,
884 Defining_Identifier => New_Disc,
886 New_Occurrence_Of (Etype (Disc), Loc),
888 New_Copy (Discriminant_Default_Value (Disc))));
890 Next_Discriminant (Disc);
897 -- Now we can construct the record type declaration. Note that this
898 -- record is limited, reflecting the underlying limitedness of the
899 -- task or protected object that it represents, and ensuring for
900 -- example that it is properly passed by reference.
903 Make_Full_Type_Declaration (Loc,
904 Defining_Identifier => Rec_Ent,
905 Discriminant_Specifications => Dlist,
907 Make_Record_Definition (Loc,
909 Make_Component_List (Loc,
910 Component_Items => Cdecls),
911 Limited_Present => True));
912 end Build_Corresponding_Record;
914 ----------------------------------
915 -- Build_Entry_Count_Expression --
916 ----------------------------------
918 function Build_Entry_Count_Expression
919 (Concurrent_Type : Node_Id;
920 Component_List : List_Id;
921 Loc : Source_Ptr) return Node_Id
932 Ent := First_Entity (Concurrent_Type);
935 -- Count number of non-family entries
937 while Present (Ent) loop
938 if Ekind (Ent) = E_Entry then
945 Ecount := Make_Integer_Literal (Loc, Eindx);
947 -- Loop through entry families building the addition nodes
949 Ent := First_Entity (Concurrent_Type);
950 Comp := First (Component_List);
952 while Present (Ent) loop
953 if Ekind (Ent) = E_Entry_Family then
954 while Chars (Ent) /= Chars (Defining_Identifier (Comp)) loop
958 Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
959 Hi := Type_High_Bound (Typ);
960 Lo := Type_Low_Bound (Typ);
965 Right_Opnd => Family_Size (Loc, Hi, Lo, Concurrent_Type));
972 end Build_Entry_Count_Expression;
974 ---------------------------
975 -- Build_Find_Body_Index --
976 ---------------------------
978 function Build_Find_Body_Index (Typ : Entity_Id) return Node_Id is
979 Loc : constant Source_Ptr := Sloc (Typ);
982 Has_F : Boolean := False;
984 If_St : Node_Id := Empty;
987 Decls : List_Id := New_List;
990 Siz : Node_Id := Empty;
992 procedure Add_If_Clause (Expr : Node_Id);
993 -- Add test for range of current entry.
995 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
996 -- If a bound of an entry is given by a discriminant, retrieve the
997 -- actual value of the discriminant from the enclosing object.
1003 procedure Add_If_Clause (Expr : Node_Id) is
1005 Stats : constant List_Id :=
1007 Make_Return_Statement (Loc,
1008 Expression => Make_Integer_Literal (Loc, Index + 1)));
1011 -- Index for current entry body.
1015 -- Compute total length of entry queues so far.
1023 Right_Opnd => Expr);
1028 Left_Opnd => Make_Identifier (Loc, Name_uE),
1031 -- Map entry queue indices in the range of the current family
1032 -- into the current index, that designates the entry body.
1036 Make_Implicit_If_Statement (Typ,
1038 Then_Statements => Stats,
1039 Elsif_Parts => New_List);
1045 Make_Elsif_Part (Loc,
1047 Then_Statements => Stats),
1048 Elsif_Parts (If_St));
1052 ------------------------------
1053 -- Convert_Discriminant_Ref --
1054 ------------------------------
1056 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
1060 if Is_Entity_Name (Bound)
1061 and then Ekind (Entity (Bound)) = E_Discriminant
1064 Make_Selected_Component (Loc,
1066 Unchecked_Convert_To (Corresponding_Record_Type (Typ),
1067 Make_Explicit_Dereference (Loc,
1068 Make_Identifier (Loc, Name_uObject))),
1069 Selector_Name => Make_Identifier (Loc, Chars (Bound)));
1070 Set_Etype (B, Etype (Entity (Bound)));
1072 B := New_Copy_Tree (Bound);
1076 end Convert_Discriminant_Ref;
1078 -- Start of processing for Build_Find_Body_Index
1081 Spec := Build_Find_Body_Index_Spec (Typ);
1083 Ent := First_Entity (Typ);
1085 while Present (Ent) loop
1087 if Ekind (Ent) = E_Entry_Family then
1097 -- If the protected type has no entry families, there is a one-one
1098 -- correspondence between entry queue and entry body.
1101 Make_Return_Statement (Loc,
1102 Expression => Make_Identifier (Loc, Name_uE));
1105 -- Suppose entries e1, e2, ... have size l1, l2, ... we generate
1108 -- if E <= l1 then return 1;
1109 -- elsif E <= l1 + l2 then return 2;
1114 Ent := First_Entity (Typ);
1116 Add_Object_Pointer (Decls, Typ, Loc);
1118 while Present (Ent) loop
1120 if Ekind (Ent) = E_Entry then
1121 Add_If_Clause (Make_Integer_Literal (Loc, 1));
1123 elsif Ekind (Ent) = E_Entry_Family then
1125 E_Typ := Etype (Discrete_Subtype_Definition (Parent (Ent)));
1126 Hi := Convert_Discriminant_Ref (Type_High_Bound (E_Typ));
1127 Lo := Convert_Discriminant_Ref (Type_Low_Bound (E_Typ));
1128 Add_If_Clause (Family_Size (Loc, Hi, Lo, Typ));
1137 Make_Return_Statement (Loc,
1138 Expression => Make_Integer_Literal (Loc, 1));
1140 elsif Nkind (Ret) = N_If_Statement then
1142 -- Ranges are in increasing order, so last one doesn't need a
1146 Nod : constant Node_Id := Last (Elsif_Parts (Ret));
1150 Set_Else_Statements (Ret, Then_Statements (Nod));
1156 Make_Subprogram_Body (Loc,
1157 Specification => Spec,
1158 Declarations => Decls,
1159 Handled_Statement_Sequence =>
1160 Make_Handled_Sequence_Of_Statements (Loc,
1161 Statements => New_List (Ret)));
1162 end Build_Find_Body_Index;
1164 --------------------------------
1165 -- Build_Find_Body_Index_Spec --
1166 --------------------------------
1168 function Build_Find_Body_Index_Spec (Typ : Entity_Id) return Node_Id is
1169 Loc : constant Source_Ptr := Sloc (Typ);
1170 Id : constant Entity_Id :=
1171 Make_Defining_Identifier (Loc,
1172 Chars => New_External_Name (Chars (Typ), 'F'));
1173 Parm1 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uO);
1174 Parm2 : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uE);
1178 Make_Function_Specification (Loc,
1179 Defining_Unit_Name => Id,
1180 Parameter_Specifications => New_List (
1181 Make_Parameter_Specification (Loc,
1182 Defining_Identifier => Parm1,
1184 New_Reference_To (RTE (RE_Address), Loc)),
1186 Make_Parameter_Specification (Loc,
1187 Defining_Identifier => Parm2,
1189 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))),
1190 Subtype_Mark => New_Occurrence_Of (
1191 RTE (RE_Protected_Entry_Index), Loc));
1192 end Build_Find_Body_Index_Spec;
1194 -------------------------
1195 -- Build_Master_Entity --
1196 -------------------------
1198 procedure Build_Master_Entity (E : Entity_Id) is
1199 Loc : constant Source_Ptr := Sloc (E);
1207 -- Ada 0Y (AI-287): Do not set/get the has_master_entity reminder in
1208 -- internal scopes. Required for nested limited aggregates.
1210 if Extensions_Allowed then
1211 while Is_Internal (S) loop
1216 -- Nothing to do if we already built a master entity for this scope
1217 -- or if there is no task hierarchy.
1219 if Has_Master_Entity (S)
1220 or else Restriction_Active (No_Task_Hierarchy)
1225 -- Otherwise first build the master entity
1226 -- _Master : constant Master_Id := Current_Master.all;
1227 -- and insert it just before the current declaration
1230 Make_Object_Declaration (Loc,
1231 Defining_Identifier =>
1232 Make_Defining_Identifier (Loc, Name_uMaster),
1233 Constant_Present => True,
1234 Object_Definition => New_Reference_To (RTE (RE_Master_Id), Loc),
1236 Make_Explicit_Dereference (Loc,
1237 New_Reference_To (RTE (RE_Current_Master), Loc)));
1240 Insert_Before (P, Decl);
1243 -- Ada 0Y (AI-287): Set the has_master_entity reminder in the
1244 -- non-internal scope selected above.
1246 if not Extensions_Allowed then
1247 Set_Has_Master_Entity (Scope (E));
1249 Set_Has_Master_Entity (S);
1252 -- Now mark the containing scope as a task master
1254 while Nkind (P) /= N_Compilation_Unit loop
1257 -- If we fall off the top, we are at the outer level, and the
1258 -- environment task is our effective master, so nothing to mark.
1260 if Nkind (P) = N_Task_Body
1261 or else Nkind (P) = N_Block_Statement
1262 or else Nkind (P) = N_Subprogram_Body
1264 Set_Is_Task_Master (P, True);
1267 elsif Nkind (Parent (P)) = N_Subunit then
1268 P := Corresponding_Stub (Parent (P));
1271 end Build_Master_Entity;
1273 ---------------------------
1274 -- Build_Protected_Entry --
1275 ---------------------------
1277 function Build_Protected_Entry
1280 Pid : Node_Id) return Node_Id
1282 Loc : constant Source_Ptr := Sloc (N);
1283 Op_Decls : constant List_Id := New_List;
1292 Make_Defining_Identifier (Loc,
1293 Chars => Chars (Protected_Body_Subprogram (Ent)));
1294 Espec := Build_Protected_Entry_Specification (Edef, Empty, Loc);
1296 -- <object pointer declaration>
1297 -- Add object pointer declaration. This is needed by the
1298 -- discriminal and prival renamings, which should already
1299 -- have been inserted into the declaration list.
1301 Add_Object_Pointer (Op_Decls, Pid, Loc);
1304 or else Restriction_Active (No_Entry_Queue) = False
1305 or else Number_Entries (Pid) > 1
1307 Complete := New_Reference_To (RTE (RE_Complete_Entry_Body), Loc);
1310 New_Reference_To (RTE (RE_Complete_Single_Entry_Body), Loc);
1313 Op_Stats := New_List (
1314 Make_Block_Statement (Loc,
1315 Declarations => Declarations (N),
1316 Handled_Statement_Sequence =>
1317 Handled_Statement_Sequence (N)),
1319 Make_Procedure_Call_Statement (Loc,
1321 Parameter_Associations => New_List (
1322 Make_Attribute_Reference (Loc,
1324 Make_Selected_Component (Loc,
1326 Make_Identifier (Loc, Name_uObject),
1329 Make_Identifier (Loc, Name_uObject)),
1330 Attribute_Name => Name_Unchecked_Access))));
1332 if Restriction_Active (No_Exception_Handlers) then
1334 Make_Subprogram_Body (Loc,
1335 Specification => Espec,
1336 Declarations => Op_Decls,
1337 Handled_Statement_Sequence =>
1338 Make_Handled_Sequence_Of_Statements (Loc, Op_Stats));
1341 Ohandle := Make_Others_Choice (Loc);
1342 Set_All_Others (Ohandle);
1345 or else Restriction_Active (No_Entry_Queue) = False
1346 or else Number_Entries (Pid) > 1
1349 New_Reference_To (RTE (RE_Exceptional_Complete_Entry_Body), Loc);
1352 Complete := New_Reference_To (
1353 RTE (RE_Exceptional_Complete_Single_Entry_Body), Loc);
1357 Make_Subprogram_Body (Loc,
1358 Specification => Espec,
1359 Declarations => Op_Decls,
1360 Handled_Statement_Sequence =>
1361 Make_Handled_Sequence_Of_Statements (Loc,
1362 Statements => Op_Stats,
1363 Exception_Handlers => New_List (
1364 Make_Exception_Handler (Loc,
1365 Exception_Choices => New_List (Ohandle),
1367 Statements => New_List (
1368 Make_Procedure_Call_Statement (Loc,
1370 Parameter_Associations => New_List (
1371 Make_Attribute_Reference (Loc,
1373 Make_Selected_Component (Loc,
1375 Make_Identifier (Loc, Name_uObject),
1377 Make_Identifier (Loc, Name_uObject)),
1378 Attribute_Name => Name_Unchecked_Access),
1380 Make_Function_Call (Loc,
1381 Name => New_Reference_To (
1382 RTE (RE_Get_GNAT_Exception), Loc)))))))));
1384 end Build_Protected_Entry;
1386 -----------------------------------------
1387 -- Build_Protected_Entry_Specification --
1388 -----------------------------------------
1390 function Build_Protected_Entry_Specification
1391 (Def_Id : Entity_Id;
1393 Loc : Source_Ptr) return Node_Id
1398 P := Make_Defining_Identifier (Loc, Name_uP);
1400 if Present (Ent_Id) then
1401 Append_Elmt (P, Accept_Address (Ent_Id));
1404 return Make_Procedure_Specification (Loc,
1405 Defining_Unit_Name => Def_Id,
1406 Parameter_Specifications => New_List (
1407 Make_Parameter_Specification (Loc,
1408 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uO),
1410 New_Reference_To (RTE (RE_Address), Loc)),
1412 Make_Parameter_Specification (Loc,
1413 Defining_Identifier => P,
1415 New_Reference_To (RTE (RE_Address), Loc)),
1417 Make_Parameter_Specification (Loc,
1418 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uE),
1420 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc))));
1421 end Build_Protected_Entry_Specification;
1423 --------------------------
1424 -- Build_Protected_Spec --
1425 --------------------------
1427 function Build_Protected_Spec
1429 Obj_Type : Entity_Id;
1430 Unprotected : Boolean := False;
1431 Ident : Entity_Id) return List_Id
1433 Loc : constant Source_Ptr := Sloc (N);
1435 New_Plist : List_Id;
1436 New_Param : Node_Id;
1439 New_Plist := New_List;
1440 Formal := First_Formal (Ident);
1442 while Present (Formal) loop
1444 Make_Parameter_Specification (Loc,
1445 Defining_Identifier =>
1446 Make_Defining_Identifier (Sloc (Formal), Chars (Formal)),
1447 In_Present => In_Present (Parent (Formal)),
1448 Out_Present => Out_Present (Parent (Formal)),
1450 New_Reference_To (Etype (Formal), Loc));
1453 Set_Protected_Formal (Formal, Defining_Identifier (New_Param));
1456 Append (New_Param, New_Plist);
1457 Next_Formal (Formal);
1460 -- If the subprogram is a procedure and the context is not an access
1461 -- to protected subprogram, the parameter is in-out. Otherwise it is
1464 Prepend_To (New_Plist,
1465 Make_Parameter_Specification (Loc,
1466 Defining_Identifier =>
1467 Make_Defining_Identifier (Loc, Name_uObject),
1470 (Etype (Ident) = Standard_Void_Type
1471 and then not Is_RTE (Obj_Type, RE_Address)),
1472 Parameter_Type => New_Reference_To (Obj_Type, Loc)));
1475 end Build_Protected_Spec;
1477 ---------------------------------------
1478 -- Build_Protected_Sub_Specification --
1479 ---------------------------------------
1481 function Build_Protected_Sub_Specification
1483 Prottyp : Entity_Id;
1484 Unprotected : Boolean := False) return Node_Id
1486 Loc : constant Source_Ptr := Sloc (N);
1488 Protnm : constant Name_Id := Chars (Prottyp);
1492 New_Plist : List_Id;
1493 Append_Char : Character;
1498 (Defining_Unit_Name (Specification (N))) = E_Subprogram_Body
1500 Decl := Unit_Declaration_Node (Corresponding_Spec (N));
1505 Ident := Defining_Unit_Name (Specification (Decl));
1506 Nam := Chars (Ident);
1508 New_Plist := Build_Protected_Spec
1509 (Decl, Corresponding_Record_Type (Prottyp),
1510 Unprotected, Ident);
1519 Make_Defining_Identifier (Loc,
1520 Chars => Build_Selected_Name (Protnm, Nam, Append_Char));
1522 -- The unprotected operation carries the user code, and debugging
1523 -- information must be generated for it, even though this spec does
1524 -- not come from source. It is also convenient to allow gdb to step
1525 -- into the protected operation, even though it only contains lock/
1528 Set_Needs_Debug_Info (New_Id);
1530 if Nkind (Specification (Decl)) = N_Procedure_Specification then
1532 Make_Procedure_Specification (Loc,
1533 Defining_Unit_Name => New_Id,
1534 Parameter_Specifications => New_Plist);
1538 Make_Function_Specification (Loc,
1539 Defining_Unit_Name => New_Id,
1540 Parameter_Specifications => New_Plist,
1541 Subtype_Mark => New_Copy (Subtype_Mark (Specification (Decl))));
1542 Set_Return_Present (Defining_Unit_Name (New_Spec));
1545 end Build_Protected_Sub_Specification;
1547 -------------------------------------
1548 -- Build_Protected_Subprogram_Body --
1549 -------------------------------------
1551 function Build_Protected_Subprogram_Body
1554 N_Op_Spec : Node_Id) return Node_Id
1556 Loc : constant Source_Ptr := Sloc (N);
1558 P_Op_Spec : Node_Id;
1561 Unprot_Call : Node_Id;
1563 Lock_Name : Node_Id;
1564 Lock_Stmt : Node_Id;
1565 Service_Name : Node_Id;
1567 Return_Stmt : Node_Id := Empty; -- init to avoid gcc 3 warning
1568 Pre_Stmts : List_Id := No_List; -- init to avoid gcc 3 warning
1570 Object_Parm : Node_Id;
1573 function Is_Exception_Safe (Subprogram : Node_Id) return Boolean;
1574 -- Tell whether a given subprogram cannot raise an exception
1576 -----------------------
1577 -- Is_Exception_Safe --
1578 -----------------------
1580 function Is_Exception_Safe (Subprogram : Node_Id) return Boolean is
1582 function Has_Side_Effect (N : Node_Id) return Boolean;
1583 -- Return True whenever encountering a subprogram call or a
1584 -- raise statement of any kind in the sequence of statements N
1586 ---------------------
1587 -- Has_Side_Effect --
1588 ---------------------
1590 -- What is this doing buried two levels down in exp_ch9. It
1591 -- seems like a generally useful function, and indeed there
1592 -- may be code duplication going on here ???
1594 function Has_Side_Effect (N : Node_Id) return Boolean is
1595 Stmt : Node_Id := N;
1598 function Is_Call_Or_Raise (N : Node_Id) return Boolean;
1599 -- Indicate whether N is a subprogram call or a raise statement
1601 function Is_Call_Or_Raise (N : Node_Id) return Boolean is
1603 return Nkind (N) = N_Procedure_Call_Statement
1604 or else Nkind (N) = N_Function_Call
1605 or else Nkind (N) = N_Raise_Statement
1606 or else Nkind (N) = N_Raise_Constraint_Error
1607 or else Nkind (N) = N_Raise_Program_Error
1608 or else Nkind (N) = N_Raise_Storage_Error;
1609 end Is_Call_Or_Raise;
1611 -- Start of processing for Has_Side_Effect
1614 while Present (Stmt) loop
1615 if Is_Call_Or_Raise (Stmt) then
1619 -- An object declaration can also contain a function call
1620 -- or a raise statement
1622 if Nkind (Stmt) = N_Object_Declaration then
1623 Expr := Expression (Stmt);
1625 if Present (Expr) and then Is_Call_Or_Raise (Expr) then
1634 end Has_Side_Effect;
1636 -- Start of processing for Is_Exception_Safe
1639 -- If the checks handled by the back end are not disabled, we cannot
1640 -- ensure that no exception will be raised.
1642 if not Access_Checks_Suppressed (Empty)
1643 or else not Discriminant_Checks_Suppressed (Empty)
1644 or else not Range_Checks_Suppressed (Empty)
1645 or else not Index_Checks_Suppressed (Empty)
1646 or else Opt.Stack_Checking_Enabled
1651 if Has_Side_Effect (First (Declarations (Subprogram)))
1654 First (Statements (Handled_Statement_Sequence (Subprogram))))
1660 end Is_Exception_Safe;
1662 -- Start of processing for Build_Protected_Subprogram_Body
1665 Op_Spec := Specification (N);
1666 Exc_Safe := Is_Exception_Safe (N);
1669 Build_Protected_Sub_Specification (N,
1670 Pid, Unprotected => False);
1672 -- Build a list of the formal parameters of the protected
1673 -- version of the subprogram to use as the actual parameters
1674 -- of the unprotected version.
1676 Uactuals := New_List;
1677 Pformal := First (Parameter_Specifications (P_Op_Spec));
1679 while Present (Pformal) loop
1681 Make_Identifier (Loc, Chars (Defining_Identifier (Pformal))),
1686 -- Make a call to the unprotected version of the subprogram
1687 -- built above for use by the protected version built below.
1689 if Nkind (Op_Spec) = N_Function_Specification then
1691 R := Make_Defining_Identifier (Loc, New_Internal_Name ('R'));
1693 Make_Object_Declaration (Loc,
1694 Defining_Identifier => R,
1695 Constant_Present => True,
1696 Object_Definition => New_Copy (Subtype_Mark (N_Op_Spec)),
1698 Make_Function_Call (Loc,
1699 Name => Make_Identifier (Loc,
1700 Chars (Defining_Unit_Name (N_Op_Spec))),
1701 Parameter_Associations => Uactuals));
1702 Return_Stmt := Make_Return_Statement (Loc,
1703 Expression => New_Reference_To (R, Loc));
1706 Unprot_Call := Make_Return_Statement (Loc,
1707 Expression => Make_Function_Call (Loc,
1709 Make_Identifier (Loc,
1710 Chars (Defining_Unit_Name (N_Op_Spec))),
1711 Parameter_Associations => Uactuals));
1715 Unprot_Call := Make_Procedure_Call_Statement (Loc,
1717 Make_Identifier (Loc,
1718 Chars (Defining_Unit_Name (N_Op_Spec))),
1719 Parameter_Associations => Uactuals);
1722 -- Wrap call in block that will be covered by an at_end handler.
1724 if not Exc_Safe then
1725 Unprot_Call := Make_Block_Statement (Loc,
1726 Handled_Statement_Sequence =>
1727 Make_Handled_Sequence_Of_Statements (Loc,
1728 Statements => New_List (Unprot_Call)));
1731 -- Make the protected subprogram body. This locks the protected
1732 -- object and calls the unprotected version of the subprogram.
1734 -- If the protected object is controlled (i.e it has entries or
1735 -- needs finalization for interrupt handling), call Lock_Entries,
1736 -- except if the protected object follows the Ravenscar profile, in
1737 -- which case call Lock_Entry, otherwise call the simplified version,
1740 if Has_Entries (Pid)
1741 or else Has_Interrupt_Handler (Pid)
1742 or else (Has_Attach_Handler (Pid) and then not Restricted_Profile)
1745 or else Restriction_Active (No_Entry_Queue) = False
1746 or else Number_Entries (Pid) > 1
1748 Lock_Name := New_Reference_To (RTE (RE_Lock_Entries), Loc);
1749 Service_Name := New_Reference_To (RTE (RE_Service_Entries), Loc);
1752 Lock_Name := New_Reference_To (RTE (RE_Lock_Entry), Loc);
1753 Service_Name := New_Reference_To (RTE (RE_Service_Entry), Loc);
1757 Lock_Name := New_Reference_To (RTE (RE_Lock), Loc);
1758 Service_Name := New_Reference_To (RTE (RE_Unlock), Loc);
1762 Make_Attribute_Reference (Loc,
1764 Make_Selected_Component (Loc,
1766 Make_Identifier (Loc, Name_uObject),
1768 Make_Identifier (Loc, Name_uObject)),
1769 Attribute_Name => Name_Unchecked_Access);
1771 Lock_Stmt := Make_Procedure_Call_Statement (Loc,
1773 Parameter_Associations => New_List (Object_Parm));
1775 if Abort_Allowed then
1777 Make_Procedure_Call_Statement (Loc,
1778 Name => New_Reference_To (RTE (RE_Abort_Defer), Loc),
1779 Parameter_Associations => Empty_List),
1783 Stmts := New_List (Lock_Stmt);
1786 if not Exc_Safe then
1787 Append (Unprot_Call, Stmts);
1789 if Nkind (Op_Spec) = N_Function_Specification then
1791 Stmts := Empty_List;
1793 Append (Unprot_Call, Stmts);
1797 Make_Procedure_Call_Statement (Loc,
1798 Name => Service_Name,
1799 Parameter_Associations =>
1800 New_List (New_Copy_Tree (Object_Parm))),
1803 if Abort_Allowed then
1805 Make_Procedure_Call_Statement (Loc,
1806 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc),
1807 Parameter_Associations => Empty_List),
1811 if Nkind (Op_Spec) = N_Function_Specification then
1812 Append (Return_Stmt, Stmts);
1813 Append (Make_Block_Statement (Loc,
1814 Declarations => New_List (Unprot_Call),
1815 Handled_Statement_Sequence =>
1816 Make_Handled_Sequence_Of_Statements (Loc,
1817 Statements => Stmts)), Pre_Stmts);
1823 Make_Subprogram_Body (Loc,
1824 Declarations => Empty_List,
1825 Specification => P_Op_Spec,
1826 Handled_Statement_Sequence =>
1827 Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts));
1829 if not Exc_Safe then
1830 Set_Is_Protected_Subprogram_Body (Sub_Body);
1834 end Build_Protected_Subprogram_Body;
1836 -------------------------------------
1837 -- Build_Protected_Subprogram_Call --
1838 -------------------------------------
1840 procedure Build_Protected_Subprogram_Call
1844 External : Boolean := True)
1846 Loc : constant Source_Ptr := Sloc (N);
1847 Sub : constant Entity_Id := Entity (Name);
1853 New_Sub := New_Occurrence_Of (External_Subprogram (Sub), Loc);
1856 New_Occurrence_Of (Protected_Body_Subprogram (Sub), Loc);
1859 if Present (Parameter_Associations (N)) then
1860 Params := New_Copy_List_Tree (Parameter_Associations (N));
1865 Prepend (Rec, Params);
1867 if Ekind (Sub) = E_Procedure then
1869 Make_Procedure_Call_Statement (Loc,
1871 Parameter_Associations => Params));
1874 pragma Assert (Ekind (Sub) = E_Function);
1876 Make_Function_Call (Loc,
1878 Parameter_Associations => Params));
1882 and then Nkind (Rec) = N_Unchecked_Type_Conversion
1883 and then Is_Entity_Name (Expression (Rec))
1884 and then Is_Shared_Passive (Entity (Expression (Rec)))
1886 Add_Shared_Var_Lock_Procs (N);
1888 end Build_Protected_Subprogram_Call;
1890 -------------------------
1891 -- Build_Selected_Name --
1892 -------------------------
1894 function Build_Selected_Name
1895 (Prefix, Selector : Name_Id;
1896 Append_Char : Character := ' ') return Name_Id
1898 Select_Buffer : String (1 .. Hostparm.Max_Name_Length);
1899 Select_Len : Natural;
1902 Get_Name_String (Selector);
1903 Select_Len := Name_Len;
1904 Select_Buffer (1 .. Select_Len) := Name_Buffer (1 .. Name_Len);
1905 Get_Name_String (Prefix);
1907 -- If scope is anonymous type, discard suffix to recover name of
1908 -- single protected object. Otherwise use protected type name.
1910 if Name_Buffer (Name_Len) = 'T' then
1911 Name_Len := Name_Len - 1;
1914 Name_Buffer (Name_Len + 1) := 'P';
1915 Name_Buffer (Name_Len + 2) := 'T';
1916 Name_Buffer (Name_Len + 3) := '_';
1917 Name_Buffer (Name_Len + 4) := '_';
1919 Name_Len := Name_Len + 4;
1920 for J in 1 .. Select_Len loop
1921 Name_Len := Name_Len + 1;
1922 Name_Buffer (Name_Len) := Select_Buffer (J);
1925 if Append_Char /= ' ' then
1926 Name_Len := Name_Len + 1;
1927 Name_Buffer (Name_Len) := Append_Char;
1931 end Build_Selected_Name;
1933 -----------------------------
1934 -- Build_Simple_Entry_Call --
1935 -----------------------------
1937 -- A task entry call is converted to a call to Call_Simple
1940 -- P : parms := (parm, parm, parm);
1942 -- Call_Simple (acceptor-task, entry-index, P'Address);
1948 -- Here Pnn is an aggregate of the type constructed for the entry to hold
1949 -- the parameters, and the constructed aggregate value contains either the
1950 -- parameters or, in the case of non-elementary types, references to these
1951 -- parameters. Then the address of this aggregate is passed to the runtime
1952 -- routine, along with the task id value and the task entry index value.
1953 -- Pnn is only required if parameters are present.
1955 -- The assignments after the call are present only in the case of in-out
1956 -- or out parameters for elementary types, and are used to assign back the
1957 -- resulting values of such parameters.
1959 -- Note: the reason that we insert a block here is that in the context
1960 -- of selects, conditional entry calls etc. the entry call statement
1961 -- appears on its own, not as an element of a list.
1963 -- A protected entry call is converted to a Protected_Entry_Call:
1966 -- P : E1_Params := (param, param, param);
1968 -- Bnn : Communications_Block;
1971 -- P : E1_Params := (param, param, param);
1972 -- Bnn : Communications_Block;
1975 -- Protected_Entry_Call (
1976 -- Object => po._object'Access,
1977 -- E => <entry index>;
1978 -- Uninterpreted_Data => P'Address;
1979 -- Mode => Simple_Call;
1986 procedure Build_Simple_Entry_Call
1995 -- Convert entry call to Call_Simple call
1998 Loc : constant Source_Ptr := Sloc (N);
1999 Parms : constant List_Id := Parameter_Associations (N);
2000 Stats : constant List_Id := New_List;
2006 Ent_Acc : Entity_Id;
2018 Comm_Name : Entity_Id;
2021 -- Simple entry and entry family cases merge here
2023 Ent := Entity (Ename);
2024 Ent_Acc := Entry_Parameters_Type (Ent);
2025 Conctyp := Etype (Concval);
2027 -- If prefix is an access type, dereference to obtain the task type
2029 if Is_Access_Type (Conctyp) then
2030 Conctyp := Designated_Type (Conctyp);
2033 -- Special case for protected subprogram calls.
2035 if Is_Protected_Type (Conctyp)
2036 and then Is_Subprogram (Entity (Ename))
2038 if not Is_Eliminated (Entity (Ename)) then
2039 Build_Protected_Subprogram_Call
2040 (N, Ename, Convert_Concurrent (Concval, Conctyp));
2047 -- First parameter is the Task_Id value from the task value or the
2048 -- Object from the protected object value, obtained by selecting
2049 -- the _Task_Id or _Object from the result of doing an unchecked
2050 -- conversion to convert the value to the corresponding record type.
2052 Parm1 := Concurrent_Ref (Concval);
2054 -- Second parameter is the entry index, computed by the routine
2055 -- provided for this purpose. The value of this expression is
2056 -- assigned to an intermediate variable to assure that any entry
2057 -- family index expressions are evaluated before the entry
2061 or else Restriction_Active (No_Entry_Queue) = False
2062 or else not Is_Protected_Type (Conctyp)
2063 or else Number_Entries (Conctyp) > 1
2065 X := Make_Defining_Identifier (Loc, Name_uX);
2068 Make_Object_Declaration (Loc,
2069 Defining_Identifier => X,
2070 Object_Definition =>
2071 New_Reference_To (RTE (RE_Task_Entry_Index), Loc),
2072 Expression => Actual_Index_Expression (
2073 Loc, Entity (Ename), Index, Concval));
2075 Decls := New_List (Xdecl);
2076 Parm2 := New_Reference_To (X, Loc);
2084 -- The third parameter is the packaged parameters. If there are
2085 -- none, then it is just the null address, since nothing is passed
2088 Parm3 := New_Reference_To (RTE (RE_Null_Address), Loc);
2091 -- Case of parameters present, where third argument is the address
2092 -- of a packaged record containing the required parameter values.
2095 -- First build a list of parameter values, which are
2096 -- references to objects of the parameter types.
2100 Actual := First_Actual (N);
2101 Formal := First_Formal (Ent);
2103 while Present (Actual) loop
2105 -- If it is a by_copy_type, copy it to a new variable. The
2106 -- packaged record has a field that points to this variable.
2108 if Is_By_Copy_Type (Etype (Actual)) then
2110 Make_Object_Declaration (Loc,
2111 Defining_Identifier =>
2112 Make_Defining_Identifier (Loc,
2113 Chars => New_Internal_Name ('J')),
2114 Aliased_Present => True,
2115 Object_Definition =>
2116 New_Reference_To (Etype (Formal), Loc));
2118 -- We have to make an assignment statement separate for
2119 -- the case of limited type. We can not assign it unless
2120 -- the Assignment_OK flag is set first.
2122 if Ekind (Formal) /= E_Out_Parameter then
2124 New_Reference_To (Defining_Identifier (N_Node), Loc);
2125 Set_Assignment_OK (N_Var);
2127 Make_Assignment_Statement (Loc,
2129 Expression => Relocate_Node (Actual)));
2132 Append (N_Node, Decls);
2135 Make_Attribute_Reference (Loc,
2136 Attribute_Name => Name_Unchecked_Access,
2138 New_Reference_To (Defining_Identifier (N_Node), Loc)));
2141 Make_Reference (Loc, Prefix => Relocate_Node (Actual)));
2144 Next_Actual (Actual);
2145 Next_Formal_With_Extras (Formal);
2148 -- Now build the declaration of parameters initialized with the
2149 -- aggregate containing this constructed parameter list.
2151 P := Make_Defining_Identifier (Loc, Name_uP);
2154 Make_Object_Declaration (Loc,
2155 Defining_Identifier => P,
2156 Object_Definition =>
2157 New_Reference_To (Designated_Type (Ent_Acc), Loc),
2159 Make_Aggregate (Loc, Expressions => Plist));
2162 Make_Attribute_Reference (Loc,
2163 Attribute_Name => Name_Address,
2164 Prefix => New_Reference_To (P, Loc));
2166 Append (Pdecl, Decls);
2169 -- Now we can create the call, case of protected type
2171 if Is_Protected_Type (Conctyp) then
2173 or else Restriction_Active (No_Entry_Queue) = False
2174 or else Number_Entries (Conctyp) > 1
2176 -- Change the type of the index declaration
2178 Set_Object_Definition (Xdecl,
2179 New_Reference_To (RTE (RE_Protected_Entry_Index), Loc));
2181 -- Some additional declarations for protected entry calls
2187 -- Bnn : Communications_Block;
2190 Make_Defining_Identifier (Loc, New_Internal_Name ('B'));
2193 Make_Object_Declaration (Loc,
2194 Defining_Identifier => Comm_Name,
2195 Object_Definition =>
2196 New_Reference_To (RTE (RE_Communication_Block), Loc)));
2198 -- Some additional statements for protected entry calls
2200 -- Protected_Entry_Call (
2201 -- Object => po._object'Access,
2202 -- E => <entry index>;
2203 -- Uninterpreted_Data => P'Address;
2204 -- Mode => Simple_Call;
2208 Make_Procedure_Call_Statement (Loc,
2210 New_Reference_To (RTE (RE_Protected_Entry_Call), Loc),
2212 Parameter_Associations => New_List (
2213 Make_Attribute_Reference (Loc,
2214 Attribute_Name => Name_Unchecked_Access,
2218 New_Reference_To (RTE (RE_Simple_Call), Loc),
2219 New_Occurrence_Of (Comm_Name, Loc)));
2222 -- Protected_Single_Entry_Call (
2223 -- Object => po._object'Access,
2224 -- Uninterpreted_Data => P'Address;
2225 -- Mode => Simple_Call);
2228 Make_Procedure_Call_Statement (Loc,
2229 Name => New_Reference_To (
2230 RTE (RE_Protected_Single_Entry_Call), Loc),
2232 Parameter_Associations => New_List (
2233 Make_Attribute_Reference (Loc,
2234 Attribute_Name => Name_Unchecked_Access,
2237 New_Reference_To (RTE (RE_Simple_Call), Loc)));
2240 -- Case of task type
2244 Make_Procedure_Call_Statement (Loc,
2245 Name => New_Reference_To (RTE (RE_Call_Simple), Loc),
2246 Parameter_Associations => New_List (Parm1, Parm2, Parm3));
2250 Append_To (Stats, Call);
2252 -- If there are out or in/out parameters by copy
2253 -- add assignment statements for the result values.
2255 if Present (Parms) then
2256 Actual := First_Actual (N);
2257 Formal := First_Formal (Ent);
2259 Set_Assignment_OK (Actual);
2260 while Present (Actual) loop
2261 if Is_By_Copy_Type (Etype (Actual))
2262 and then Ekind (Formal) /= E_In_Parameter
2265 Make_Assignment_Statement (Loc,
2266 Name => New_Copy (Actual),
2268 Make_Explicit_Dereference (Loc,
2269 Make_Selected_Component (Loc,
2270 Prefix => New_Reference_To (P, Loc),
2272 Make_Identifier (Loc, Chars (Formal)))));
2274 -- In all cases (including limited private types) we
2275 -- want the assignment to be valid.
2277 Set_Assignment_OK (Name (N_Node));
2279 -- If the call is the triggering alternative in an
2280 -- asynchronous select, or the entry_call alternative
2281 -- of a conditional entry call, the assignments for in-out
2282 -- parameters are incorporated into the statement list
2283 -- that follows, so that there are executed only if the
2284 -- entry call succeeds.
2286 if (Nkind (Parent (N)) = N_Triggering_Alternative
2287 and then N = Triggering_Statement (Parent (N)))
2289 (Nkind (Parent (N)) = N_Entry_Call_Alternative
2290 and then N = Entry_Call_Statement (Parent (N)))
2292 if No (Statements (Parent (N))) then
2293 Set_Statements (Parent (N), New_List);
2296 Prepend (N_Node, Statements (Parent (N)));
2299 Insert_After (Call, N_Node);
2303 Next_Actual (Actual);
2304 Next_Formal_With_Extras (Formal);
2308 -- Finally, create block and analyze it
2311 Make_Block_Statement (Loc,
2312 Declarations => Decls,
2313 Handled_Statement_Sequence =>
2314 Make_Handled_Sequence_Of_Statements (Loc,
2315 Statements => Stats)));
2319 end Build_Simple_Entry_Call;
2321 --------------------------------
2322 -- Build_Task_Activation_Call --
2323 --------------------------------
2325 procedure Build_Task_Activation_Call (N : Node_Id) is
2326 Loc : constant Source_Ptr := Sloc (N);
2333 -- Get the activation chain entity. Except in the case of a package
2334 -- body, this is in the node that w as passed. For a package body, we
2335 -- have to find the corresponding package declaration node.
2337 if Nkind (N) = N_Package_Body then
2338 P := Corresponding_Spec (N);
2342 exit when Nkind (P) = N_Package_Declaration;
2345 Chain := Activation_Chain_Entity (P);
2348 Chain := Activation_Chain_Entity (N);
2351 if Present (Chain) then
2352 if Restricted_Profile then
2353 Name := New_Reference_To (RTE (RE_Activate_Restricted_Tasks), Loc);
2355 Name := New_Reference_To (RTE (RE_Activate_Tasks), Loc);
2359 Make_Procedure_Call_Statement (Loc,
2361 Parameter_Associations =>
2362 New_List (Make_Attribute_Reference (Loc,
2363 Prefix => New_Occurrence_Of (Chain, Loc),
2364 Attribute_Name => Name_Unchecked_Access)));
2366 if Nkind (N) = N_Package_Declaration then
2367 if Present (Corresponding_Body (N)) then
2370 elsif Present (Private_Declarations (Specification (N))) then
2371 Append (Call, Private_Declarations (Specification (N)));
2374 Append (Call, Visible_Declarations (Specification (N)));
2378 if Present (Handled_Statement_Sequence (N)) then
2380 -- The call goes at the start of the statement sequence, but
2381 -- after the start of exception range label if one is present.
2387 Stm := First (Statements (Handled_Statement_Sequence (N)));
2389 if Nkind (Stm) = N_Label and then Exception_Junk (Stm) then
2393 Insert_Before (Stm, Call);
2397 Set_Handled_Statement_Sequence (N,
2398 Make_Handled_Sequence_Of_Statements (Loc,
2399 Statements => New_List (Call)));
2404 Check_Task_Activation (N);
2406 end Build_Task_Activation_Call;
2408 -------------------------------
2409 -- Build_Task_Allocate_Block --
2410 -------------------------------
2412 procedure Build_Task_Allocate_Block
2417 T : constant Entity_Id := Entity (Expression (N));
2418 Init : constant Entity_Id := Base_Init_Proc (T);
2419 Loc : constant Source_Ptr := Sloc (N);
2420 Chain : constant Entity_Id :=
2421 Make_Defining_Identifier (Loc, Name_uChain);
2427 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
2430 Make_Block_Statement (Loc,
2431 Identifier => New_Reference_To (Blkent, Loc),
2432 Declarations => New_List (
2434 -- _Chain : Activation_Chain;
2436 Make_Object_Declaration (Loc,
2437 Defining_Identifier => Chain,
2438 Aliased_Present => True,
2439 Object_Definition =>
2440 New_Reference_To (RTE (RE_Activation_Chain), Loc))),
2442 Handled_Statement_Sequence =>
2443 Make_Handled_Sequence_Of_Statements (Loc,
2445 Statements => New_List (
2449 Make_Procedure_Call_Statement (Loc,
2450 Name => New_Reference_To (Init, Loc),
2451 Parameter_Associations => Args),
2453 -- Activate_Tasks (_Chain);
2455 Make_Procedure_Call_Statement (Loc,
2456 Name => New_Reference_To (RTE (RE_Activate_Tasks), Loc),
2457 Parameter_Associations => New_List (
2458 Make_Attribute_Reference (Loc,
2459 Prefix => New_Reference_To (Chain, Loc),
2460 Attribute_Name => Name_Unchecked_Access))))),
2462 Has_Created_Identifier => True,
2463 Is_Task_Allocation_Block => True);
2466 Make_Implicit_Label_Declaration (Loc,
2467 Defining_Identifier => Blkent,
2468 Label_Construct => Block));
2470 Append_To (Actions, Block);
2472 Set_Activation_Chain_Entity (Block, Chain);
2473 end Build_Task_Allocate_Block;
2475 -----------------------------------------------
2476 -- Build_Task_Allocate_Block_With_Init_Stmts --
2477 -----------------------------------------------
2479 procedure Build_Task_Allocate_Block_With_Init_Stmts
2482 Init_Stmts : List_Id)
2484 Loc : constant Source_Ptr := Sloc (N);
2485 Chain : constant Entity_Id :=
2486 Make_Defining_Identifier (Loc, Name_uChain);
2491 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
2493 Append_To (Init_Stmts,
2494 Make_Procedure_Call_Statement (Loc,
2495 Name => New_Reference_To (RTE (RE_Activate_Tasks), Loc),
2496 Parameter_Associations => New_List (
2497 Make_Attribute_Reference (Loc,
2498 Prefix => New_Reference_To (Chain, Loc),
2499 Attribute_Name => Name_Unchecked_Access))));
2502 Make_Block_Statement (Loc,
2503 Identifier => New_Reference_To (Blkent, Loc),
2504 Declarations => New_List (
2506 -- _Chain : Activation_Chain;
2508 Make_Object_Declaration (Loc,
2509 Defining_Identifier => Chain,
2510 Aliased_Present => True,
2511 Object_Definition =>
2512 New_Reference_To (RTE (RE_Activation_Chain), Loc))),
2514 Handled_Statement_Sequence =>
2515 Make_Handled_Sequence_Of_Statements (Loc, Init_Stmts),
2517 Has_Created_Identifier => True,
2518 Is_Task_Allocation_Block => True);
2521 Make_Implicit_Label_Declaration (Loc,
2522 Defining_Identifier => Blkent,
2523 Label_Construct => Block));
2525 Append_To (Actions, Block);
2527 Set_Activation_Chain_Entity (Block, Chain);
2528 end Build_Task_Allocate_Block_With_Init_Stmts;
2530 -----------------------------------
2531 -- Build_Task_Proc_Specification --
2532 -----------------------------------
2534 function Build_Task_Proc_Specification (T : Entity_Id) return Node_Id is
2535 Loc : constant Source_Ptr := Sloc (T);
2536 Nam : constant Name_Id := Chars (T);
2537 Tdec : constant Node_Id := Declaration_Node (T);
2542 Make_Defining_Identifier (Loc,
2543 Chars => New_External_Name (Nam, 'B'));
2544 Set_Is_Internal (Ent);
2546 -- Associate the procedure with the task, if this is the declaration
2547 -- (and not the body) of the procedure.
2549 if No (Task_Body_Procedure (Tdec)) then
2550 Set_Task_Body_Procedure (Tdec, Ent);
2554 Make_Procedure_Specification (Loc,
2555 Defining_Unit_Name => Ent,
2556 Parameter_Specifications =>
2558 Make_Parameter_Specification (Loc,
2559 Defining_Identifier =>
2560 Make_Defining_Identifier (Loc, Name_uTask),
2562 Make_Access_Definition (Loc,
2565 (Corresponding_Record_Type (T), Loc)))));
2566 end Build_Task_Proc_Specification;
2568 ---------------------------------------
2569 -- Build_Unprotected_Subprogram_Body --
2570 ---------------------------------------
2572 function Build_Unprotected_Subprogram_Body
2574 Pid : Node_Id) return Node_Id
2576 Loc : constant Source_Ptr := Sloc (N);
2577 N_Op_Spec : Node_Id;
2581 -- Make an unprotected version of the subprogram for use
2582 -- within the same object, with a new name and an additional
2583 -- parameter representing the object.
2585 Op_Decls := Declarations (N);
2587 Build_Protected_Sub_Specification
2588 (N, Pid, Unprotected => True);
2591 Make_Subprogram_Body (Loc,
2592 Specification => N_Op_Spec,
2593 Declarations => Op_Decls,
2594 Handled_Statement_Sequence =>
2595 Handled_Statement_Sequence (N));
2596 end Build_Unprotected_Subprogram_Body;
2598 ----------------------------
2599 -- Collect_Entry_Families --
2600 ----------------------------
2602 procedure Collect_Entry_Families
2605 Current_Node : in out Node_Id;
2606 Conctyp : Entity_Id)
2609 Efam_Decl : Node_Id;
2610 Efam_Type : Entity_Id;
2613 Efam := First_Entity (Conctyp);
2615 while Present (Efam) loop
2617 if Ekind (Efam) = E_Entry_Family then
2619 Make_Defining_Identifier (Loc,
2620 Chars => New_Internal_Name ('F'));
2623 Make_Full_Type_Declaration (Loc,
2624 Defining_Identifier => Efam_Type,
2626 Make_Unconstrained_Array_Definition (Loc,
2627 Subtype_Marks => (New_List (
2630 (Etype (Discrete_Subtype_Definition
2631 (Parent (Efam)))), Loc))),
2633 Component_Definition =>
2634 Make_Component_Definition (Loc,
2635 Aliased_Present => False,
2636 Subtype_Indication =>
2637 New_Reference_To (Standard_Character, Loc))));
2639 Insert_After (Current_Node, Efam_Decl);
2640 Current_Node := Efam_Decl;
2641 Analyze (Efam_Decl);
2644 Make_Component_Declaration (Loc,
2645 Defining_Identifier =>
2646 Make_Defining_Identifier (Loc, Chars (Efam)),
2648 Component_Definition =>
2649 Make_Component_Definition (Loc,
2650 Aliased_Present => False,
2651 Subtype_Indication =>
2652 Make_Subtype_Indication (Loc,
2654 New_Occurrence_Of (Efam_Type, Loc),
2657 Make_Index_Or_Discriminant_Constraint (Loc,
2658 Constraints => New_List (
2660 (Etype (Discrete_Subtype_Definition
2661 (Parent (Efam))), Loc)))))));
2667 end Collect_Entry_Families;
2669 --------------------
2670 -- Concurrent_Ref --
2671 --------------------
2673 -- The expression returned for a reference to a concurrent
2674 -- object has the form:
2676 -- taskV!(name)._Task_Id
2680 -- objectV!(name)._Object
2682 -- for a protected object.
2684 -- For the case of an access to a concurrent object,
2685 -- there is an extra explicit dereference:
2687 -- taskV!(name.all)._Task_Id
2688 -- objectV!(name.all)._Object
2690 -- here taskV and objectV are the types for the associated records, which
2691 -- contain the required _Task_Id and _Object fields for tasks and
2692 -- protected objects, respectively.
2694 -- For the case of a task type name, the expression is
2698 -- i.e. a call to the Self function which returns precisely this Task_Id
2700 -- For the case of a protected type name, the expression is
2704 -- which is a renaming of the _object field of the current object
2705 -- object record, passed into protected operations as a parameter.
2707 function Concurrent_Ref (N : Node_Id) return Node_Id is
2708 Loc : constant Source_Ptr := Sloc (N);
2709 Ntyp : constant Entity_Id := Etype (N);
2713 function Is_Current_Task (T : Entity_Id) return Boolean;
2714 -- Check whether the reference is to the immediately enclosing task
2715 -- type, or to an outer one (rare but legal).
2717 ---------------------
2718 -- Is_Current_Task --
2719 ---------------------
2721 function Is_Current_Task (T : Entity_Id) return Boolean is
2725 Scop := Current_Scope;
2726 while Present (Scop)
2727 and then Scop /= Standard_Standard
2733 elsif Is_Task_Type (Scop) then
2736 -- If this is a procedure nested within the task type, we must
2737 -- assume that it can be called from an inner task, and therefore
2738 -- cannot treat it as a local reference.
2740 elsif Is_Overloadable (Scop)
2741 and then In_Open_Scopes (T)
2746 Scop := Scope (Scop);
2750 -- We know that we are within the task body, so should have
2751 -- found it in scope.
2753 raise Program_Error;
2754 end Is_Current_Task;
2756 -- Start of processing for Concurrent_Ref
2759 if Is_Access_Type (Ntyp) then
2760 Dtyp := Designated_Type (Ntyp);
2762 if Is_Protected_Type (Dtyp) then
2763 Sel := Name_uObject;
2765 Sel := Name_uTask_Id;
2769 Make_Selected_Component (Loc,
2771 Unchecked_Convert_To (Corresponding_Record_Type (Dtyp),
2772 Make_Explicit_Dereference (Loc, N)),
2773 Selector_Name => Make_Identifier (Loc, Sel));
2775 elsif Is_Entity_Name (N)
2776 and then Is_Concurrent_Type (Entity (N))
2778 if Is_Task_Type (Entity (N)) then
2780 if Is_Current_Task (Entity (N)) then
2782 Make_Function_Call (Loc,
2783 Name => New_Reference_To (RTE (RE_Self), Loc));
2788 T_Self : constant Entity_Id
2789 := Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
2790 T_Body : constant Node_Id
2791 := Parent (Corresponding_Body (Parent (Entity (N))));
2794 Decl := Make_Object_Declaration (Loc,
2795 Defining_Identifier => T_Self,
2796 Object_Definition =>
2797 New_Occurrence_Of (RTE (RO_ST_Task_ID), Loc),
2799 Make_Function_Call (Loc,
2800 Name => New_Reference_To (RTE (RE_Self), Loc)));
2801 Prepend (Decl, Declarations (T_Body));
2803 Set_Scope (T_Self, Entity (N));
2804 return New_Occurrence_Of (T_Self, Loc);
2809 pragma Assert (Is_Protected_Type (Entity (N)));
2812 Object_Ref (Corresponding_Body (Parent (Base_Type (Ntyp)))),
2817 pragma Assert (Is_Concurrent_Type (Ntyp));
2819 if Is_Protected_Type (Ntyp) then
2820 Sel := Name_uObject;
2822 Sel := Name_uTask_Id;
2826 Make_Selected_Component (Loc,
2828 Unchecked_Convert_To (Corresponding_Record_Type (Ntyp),
2830 Selector_Name => Make_Identifier (Loc, Sel));
2834 ------------------------
2835 -- Convert_Concurrent --
2836 ------------------------
2838 function Convert_Concurrent
2840 Typ : Entity_Id) return Node_Id
2843 if not Is_Concurrent_Type (Typ) then
2847 Unchecked_Convert_To (Corresponding_Record_Type (Typ),
2850 end Convert_Concurrent;
2852 ----------------------------
2853 -- Entry_Index_Expression --
2854 ----------------------------
2856 function Entry_Index_Expression
2860 Ttyp : Entity_Id) return Node_Id
2870 -- The queues of entries and entry families appear in textual
2871 -- order in the associated record. The entry index is computed as
2872 -- the sum of the number of queues for all entries that precede the
2873 -- designated one, to which is added the index expression, if this
2874 -- expression denotes a member of a family.
2876 -- The following is a place holder for the count of simple entries.
2878 Num := Make_Integer_Literal (Sloc, 1);
2880 -- We construct an expression which is a series of addition
2881 -- operations. The first operand is the number of single entries that
2882 -- precede this one, the second operand is the index value relative
2883 -- to the start of the referenced family, and the remaining operands
2884 -- are the lengths of the entry families that precede this entry, i.e.
2885 -- the constructed expression is:
2887 -- number_simple_entries +
2888 -- (s'pos (index-value) - s'pos (family'first)) + 1 +
2889 -- family'length + ...
2891 -- where index-value is the given index value, and s is the index
2892 -- subtype (we have to use pos because the subtype might be an
2893 -- enumeration type preventing direct subtraction).
2894 -- Note that the task entry array is one-indexed.
2896 -- The upper bound of the entry family may be a discriminant, so we
2897 -- retrieve the lower bound explicitly to compute offset, rather than
2898 -- using the index subtype which may mention a discriminant.
2900 if Present (Index) then
2901 S := Etype (Discrete_Subtype_Definition (Declaration_Node (Ent)));
2910 Make_Attribute_Reference (Sloc,
2911 Attribute_Name => Name_Pos,
2912 Prefix => New_Reference_To (Base_Type (S), Sloc),
2913 Expressions => New_List (Relocate_Node (Index))),
2920 -- Now add lengths of preceding entries and entry families.
2922 Prev := First_Entity (Ttyp);
2924 while Chars (Prev) /= Chars (Ent)
2925 or else (Ekind (Prev) /= Ekind (Ent))
2926 or else not Sem_Ch6.Type_Conformant (Ent, Prev)
2928 if Ekind (Prev) = E_Entry then
2929 Set_Intval (Num, Intval (Num) + 1);
2931 elsif Ekind (Prev) = E_Entry_Family then
2933 Etype (Discrete_Subtype_Definition (Declaration_Node (Prev)));
2934 Lo := Type_Low_Bound (S);
2935 Hi := Type_High_Bound (S);
2940 Right_Opnd => Family_Size (Sloc, Hi, Lo, Ttyp));
2942 -- Other components are anonymous types to be ignored.
2952 end Entry_Index_Expression;
2954 ---------------------------
2955 -- Establish_Task_Master --
2956 ---------------------------
2958 procedure Establish_Task_Master (N : Node_Id) is
2962 if Restriction_Active (No_Task_Hierarchy) = False then
2963 Call := Build_Runtime_Call (Sloc (N), RE_Enter_Master);
2964 Prepend_To (Declarations (N), Call);
2967 end Establish_Task_Master;
2969 --------------------------------
2970 -- Expand_Accept_Declarations --
2971 --------------------------------
2973 -- Part of the expansion of an accept statement involves the creation of
2974 -- a declaration that can be referenced from the statement sequence of
2979 -- This declaration is inserted immediately before the accept statement
2980 -- and it is important that it be inserted before the statements of the
2981 -- statement sequence are analyzed. Thus it would be too late to create
2982 -- this declaration in the Expand_N_Accept_Statement routine, which is
2983 -- why there is a separate procedure to be called directly from Sem_Ch9.
2985 -- Ann is used to hold the address of the record containing the parameters
2986 -- (see Expand_N_Entry_Call for more details on how this record is built).
2987 -- References to the parameters do an unchecked conversion of this address
2988 -- to a pointer to the required record type, and then access the field that
2989 -- holds the value of the required parameter. The entity for the address
2990 -- variable is held as the top stack element (i.e. the last element) of the
2991 -- Accept_Address stack in the corresponding entry entity, and this element
2992 -- must be set in place before the statements are processed.
2994 -- The above description applies to the case of a stand alone accept
2995 -- statement, i.e. one not appearing as part of a select alternative.
2997 -- For the case of an accept that appears as part of a select alternative
2998 -- of a selective accept, we must still create the declaration right away,
2999 -- since Ann is needed immediately, but there is an important difference:
3001 -- The declaration is inserted before the selective accept, not before
3002 -- the accept statement (which is not part of a list anyway, and so would
3003 -- not accommodate inserted declarations)
3005 -- We only need one address variable for the entire selective accept. So
3006 -- the Ann declaration is created only for the first accept alternative,
3007 -- and subsequent accept alternatives reference the same Ann variable.
3009 -- We can distinguish the two cases by seeing whether the accept statement
3010 -- is part of a list. If not, then it must be in an accept alternative.
3012 -- To expand the requeue statement, a label is provided at the end of
3013 -- the accept statement or alternative of which it is a part, so that
3014 -- the statement can be skipped after the requeue is complete.
3015 -- This label is created here rather than during the expansion of the
3016 -- accept statement, because it will be needed by any requeue
3017 -- statements within the accept, which are expanded before the
3020 procedure Expand_Accept_Declarations (N : Node_Id; Ent : Entity_Id) is
3021 Loc : constant Source_Ptr := Sloc (N);
3022 Ann : Entity_Id := Empty;
3030 if Expander_Active then
3032 -- If we have no handled statement sequence, then build a dummy
3033 -- sequence consisting of a null statement. This is only done if
3034 -- pragma FIFO_Within_Priorities is specified. The issue here is
3035 -- that even a null accept body has an effect on the called task
3036 -- in terms of its position in the queue, so we cannot optimize
3037 -- the context switch away. However, if FIFO_Within_Priorities
3038 -- is not active, the optimization is legitimate, since we can
3039 -- say that our dispatching policy (i.e. the default dispatching
3040 -- policy) reorders the queue to be the same as just before the
3041 -- call. In the absence of a specified dispatching policy, we are
3042 -- allowed to modify queue orders for a given priority at will!
3044 if Opt.Task_Dispatching_Policy = 'F' and then
3045 not Present (Handled_Statement_Sequence (N))
3047 Set_Handled_Statement_Sequence (N,
3048 Make_Handled_Sequence_Of_Statements (Loc,
3049 New_List (Make_Null_Statement (Loc))));
3052 -- Create and declare two labels to be placed at the end of the
3053 -- accept statement. The first label is used to allow requeues to
3054 -- skip the remainder of entry processing. The second label is
3055 -- used to skip the remainder of entry processing if the rendezvous
3056 -- completes in the middle of the accept body.
3058 if Present (Handled_Statement_Sequence (N)) then
3059 Lab_Id := Make_Identifier (Loc, New_Internal_Name ('L'));
3061 Make_Defining_Identifier (Loc, Chars (Lab_Id)));
3062 Lab := Make_Label (Loc, Lab_Id);
3064 Make_Implicit_Label_Declaration (Loc,
3065 Defining_Identifier => Entity (Lab_Id),
3066 Label_Construct => Lab);
3067 Append (Lab, Statements (Handled_Statement_Sequence (N)));
3069 Lab_Id := Make_Identifier (Loc, New_Internal_Name ('L'));
3071 Make_Defining_Identifier (Loc, Chars (Lab_Id)));
3072 Lab := Make_Label (Loc, Lab_Id);
3074 Make_Implicit_Label_Declaration (Loc,
3075 Defining_Identifier => Entity (Lab_Id),
3076 Label_Construct => Lab);
3077 Append (Lab, Statements (Handled_Statement_Sequence (N)));
3084 -- Case of stand alone accept statement
3086 if Is_List_Member (N) then
3088 if Present (Handled_Statement_Sequence (N)) then
3090 Make_Defining_Identifier (Loc,
3091 Chars => New_Internal_Name ('A'));
3094 Make_Object_Declaration (Loc,
3095 Defining_Identifier => Ann,
3096 Object_Definition =>
3097 New_Reference_To (RTE (RE_Address), Loc));
3099 Insert_Before (N, Adecl);
3102 Insert_Before (N, Ldecl);
3105 Insert_Before (N, Ldecl2);
3109 -- Case of accept statement which is in an accept alternative
3113 Acc_Alt : constant Node_Id := Parent (N);
3114 Sel_Acc : constant Node_Id := Parent (Acc_Alt);
3118 pragma Assert (Nkind (Acc_Alt) = N_Accept_Alternative);
3119 pragma Assert (Nkind (Sel_Acc) = N_Selective_Accept);
3121 -- ??? Consider a single label for select statements.
3123 if Present (Handled_Statement_Sequence (N)) then
3125 Statements (Handled_Statement_Sequence (N)));
3129 Statements (Handled_Statement_Sequence (N)));
3133 -- Find first accept alternative of the selective accept. A
3134 -- valid selective accept must have at least one accept in it.
3136 Alt := First (Select_Alternatives (Sel_Acc));
3138 while Nkind (Alt) /= N_Accept_Alternative loop
3142 -- If we are the first accept statement, then we have to
3143 -- create the Ann variable, as for the stand alone case,
3144 -- except that it is inserted before the selective accept.
3145 -- Similarly, a label for requeue expansion must be
3148 if N = Accept_Statement (Alt) then
3150 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
3153 Make_Object_Declaration (Loc,
3154 Defining_Identifier => Ann,
3155 Object_Definition =>
3156 New_Reference_To (RTE (RE_Address), Loc));
3158 Insert_Before (Sel_Acc, Adecl);
3161 -- If we are not the first accept statement, then find the
3162 -- Ann variable allocated by the first accept and use it.
3166 Node (Last_Elmt (Accept_Address
3167 (Entity (Entry_Direct_Name (Accept_Statement (Alt))))));
3172 -- Merge here with Ann either created or referenced, and Adecl
3173 -- pointing to the corresponding declaration. Remaining processing
3174 -- is the same for the two cases.
3176 if Present (Ann) then
3177 Append_Elmt (Ann, Accept_Address (Ent));
3178 Set_Needs_Debug_Info (Ann);
3181 -- Create renaming declarations for the entry formals. Each
3182 -- reference to a formal becomes a dereference of a component
3183 -- of the parameter block, whose address is held in Ann.
3184 -- These declarations are eventually inserted into the accept
3185 -- block, and analyzed there so that they have the proper scope
3186 -- for gdb and do not conflict with other declarations.
3188 if Present (Parameter_Specifications (N))
3189 and then Present (Handled_Statement_Sequence (N))
3199 Formal := First_Formal (Ent);
3201 while Present (Formal) loop
3202 Comp := Entry_Component (Formal);
3204 Make_Defining_Identifier (Sloc (Formal), Chars (Formal));
3205 Set_Etype (New_F, Etype (Formal));
3206 Set_Scope (New_F, Ent);
3207 Set_Needs_Debug_Info (New_F); -- That's the whole point.
3209 if Ekind (Formal) = E_In_Parameter then
3210 Set_Ekind (New_F, E_Constant);
3212 Set_Ekind (New_F, E_Variable);
3213 Set_Extra_Constrained (New_F, Extra_Constrained (Formal));
3216 Set_Actual_Subtype (New_F, Actual_Subtype (Formal));
3219 Make_Object_Renaming_Declaration (Loc,
3220 Defining_Identifier => New_F,
3221 Subtype_Mark => New_Reference_To (Etype (Formal), Loc),
3223 Make_Explicit_Dereference (Loc,
3224 Make_Selected_Component (Loc,
3226 Unchecked_Convert_To (Entry_Parameters_Type (Ent),
3227 New_Reference_To (Ann, Loc)),
3229 New_Reference_To (Comp, Loc))));
3231 if No (Declarations (N)) then
3232 Set_Declarations (N, New_List);
3235 Append (Decl, Declarations (N));
3236 Set_Renamed_Object (Formal, New_F);
3237 Next_Formal (Formal);
3244 end Expand_Accept_Declarations;
3246 ---------------------------------------------
3247 -- Expand_Access_Protected_Subprogram_Type --
3248 ---------------------------------------------
3250 procedure Expand_Access_Protected_Subprogram_Type (N : Node_Id) is
3251 Loc : constant Source_Ptr := Sloc (N);
3253 T : constant Entity_Id := Defining_Identifier (N);
3254 D_T : constant Entity_Id := Designated_Type (T);
3255 D_T2 : constant Entity_Id := Make_Defining_Identifier
3256 (Loc, New_Internal_Name ('D'));
3257 E_T : constant Entity_Id := Make_Defining_Identifier
3258 (Loc, New_Internal_Name ('E'));
3259 P_List : constant List_Id := Build_Protected_Spec
3260 (N, RTE (RE_Address), False, D_T);
3266 -- Create access to protected subprogram with full signature.
3268 if Nkind (Type_Definition (N)) = N_Access_Function_Definition then
3270 Make_Access_Function_Definition (Loc,
3271 Parameter_Specifications => P_List,
3272 Subtype_Mark => New_Copy (Subtype_Mark (Type_Definition (N))));
3276 Make_Access_Procedure_Definition (Loc,
3277 Parameter_Specifications => P_List);
3281 Make_Full_Type_Declaration (Loc,
3282 Defining_Identifier => D_T2,
3283 Type_Definition => Def1);
3286 Insert_After (N, Decl1);
3288 -- Create Equivalent_Type, a record with two components for an
3289 -- access to object and an access to subprogram.
3292 Make_Component_Declaration (Loc,
3293 Defining_Identifier =>
3294 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
3295 Component_Definition =>
3296 Make_Component_Definition (Loc,
3297 Aliased_Present => False,
3298 Subtype_Indication =>
3299 New_Occurrence_Of (RTE (RE_Address), Loc))),
3301 Make_Component_Declaration (Loc,
3302 Defining_Identifier =>
3303 Make_Defining_Identifier (Loc, New_Internal_Name ('S')),
3304 Component_Definition =>
3305 Make_Component_Definition (Loc,
3306 Aliased_Present => False,
3307 Subtype_Indication => New_Occurrence_Of (D_T2, Loc))));
3310 Make_Full_Type_Declaration (Loc,
3311 Defining_Identifier => E_T,
3313 Make_Record_Definition (Loc,
3315 Make_Component_List (Loc,
3316 Component_Items => Comps)));
3319 Insert_After (Decl1, Decl2);
3320 Set_Equivalent_Type (T, E_T);
3321 end Expand_Access_Protected_Subprogram_Type;
3323 --------------------------
3324 -- Expand_Entry_Barrier --
3325 --------------------------
3327 procedure Expand_Entry_Barrier (N : Node_Id; Ent : Entity_Id) is
3328 Loc : constant Source_Ptr := Sloc (N);
3329 Prot : constant Entity_Id := Scope (Ent);
3330 Spec_Decl : constant Node_Id := Parent (Prot);
3331 Cond : constant Node_Id :=
3332 Condition (Entry_Body_Formal_Part (N));
3335 Body_Decl : Node_Id;
3338 if No_Run_Time_Mode then
3339 Error_Msg_CRT ("entry barrier", N);
3343 -- The body of the entry barrier must be analyzed in the context of
3344 -- the protected object, but its scope is external to it, just as any
3345 -- other unprotected version of a protected operation. The specification
3346 -- has been produced when the protected type declaration was elaborated.
3347 -- We build the body, insert it in the enclosing scope, but analyze it
3348 -- in the current context. A more uniform approach would be to treat a
3349 -- barrier just as a protected function, and discard the protected
3350 -- version of it because it is never called.
3352 if Expander_Active then
3353 B_F := Build_Barrier_Function (N, Ent, Prot);
3354 Func := Barrier_Function (Ent);
3355 Set_Corresponding_Spec (B_F, Func);
3357 Body_Decl := Parent (Corresponding_Body (Spec_Decl));
3359 if Nkind (Parent (Body_Decl)) = N_Subunit then
3360 Body_Decl := Corresponding_Stub (Parent (Body_Decl));
3363 Insert_Before_And_Analyze (Body_Decl, B_F);
3365 Update_Prival_Subtypes (B_F);
3367 Set_Privals (Spec_Decl, N, Loc);
3368 Set_Discriminals (Spec_Decl);
3369 Set_Scope (Func, Scope (Prot));
3372 Analyze_And_Resolve (Cond, Any_Boolean);
3375 -- The Ravenscar profile restricts barriers to simple variables
3376 -- declared within the protected object. We also allow Boolean
3377 -- constants, since these appear in several published examples
3378 -- and are also allowed by the Aonix compiler.
3380 -- Note that after analysis variables in this context will be
3381 -- replaced by the corresponding prival, that is to say a renaming
3382 -- of a selected component of the form _Object.Var. If expansion is
3383 -- disabled, as within a generic, we check that the entity appears in
3384 -- the current scope.
3386 if Is_Entity_Name (Cond) then
3388 if Entity (Cond) = Standard_False
3390 Entity (Cond) = Standard_True
3394 elsif not Expander_Active
3395 and then Scope (Entity (Cond)) = Current_Scope
3399 -- Check for case of _object.all.field (note that the explicit
3400 -- dereference gets inserted by analyze/expand of _object.field)
3402 elsif Present (Renamed_Object (Entity (Cond)))
3404 Nkind (Renamed_Object (Entity (Cond))) = N_Selected_Component
3408 (Prefix (Renamed_Object (Entity (Cond))))) = Name_uObject
3414 -- It is not a boolean variable or literal, so check the restriction
3416 Check_Restriction (Simple_Barriers, Cond);
3417 end Expand_Entry_Barrier;
3419 ------------------------------------
3420 -- Expand_Entry_Body_Declarations --
3421 ------------------------------------
3423 procedure Expand_Entry_Body_Declarations (N : Node_Id) is
3424 Loc : constant Source_Ptr := Sloc (N);
3425 Index_Spec : Node_Id;
3428 if Expander_Active then
3430 -- Expand entry bodies corresponding to entry families
3431 -- by assigning a placeholder for the constant that will
3432 -- be used to expand references to the entry index parameter.
3435 Entry_Index_Specification (Entry_Body_Formal_Part (N));
3437 if Present (Index_Spec) then
3438 Set_Entry_Index_Constant (
3439 Defining_Identifier (Index_Spec),
3440 Make_Defining_Identifier (Loc, New_Internal_Name ('J')));
3443 end Expand_Entry_Body_Declarations;
3445 ------------------------------
3446 -- Expand_N_Abort_Statement --
3447 ------------------------------
3449 -- Expand abort T1, T2, .. Tn; into:
3450 -- Abort_Tasks (Task_List'(1 => T1.Task_Id, 2 => T2.Task_Id ...))
3452 procedure Expand_N_Abort_Statement (N : Node_Id) is
3453 Loc : constant Source_Ptr := Sloc (N);
3454 Tlist : constant List_Id := Names (N);
3460 Aggr := Make_Aggregate (Loc, Component_Associations => New_List);
3463 Tasknm := First (Tlist);
3465 while Present (Tasknm) loop
3467 Append_To (Component_Associations (Aggr),
3468 Make_Component_Association (Loc,
3469 Choices => New_List (
3470 Make_Integer_Literal (Loc, Count)),
3471 Expression => Concurrent_Ref (Tasknm)));
3476 Make_Procedure_Call_Statement (Loc,
3477 Name => New_Reference_To (RTE (RE_Abort_Tasks), Loc),
3478 Parameter_Associations => New_List (
3479 Make_Qualified_Expression (Loc,
3480 Subtype_Mark => New_Reference_To (RTE (RE_Task_List), Loc),
3481 Expression => Aggr))));
3484 end Expand_N_Abort_Statement;
3486 -------------------------------
3487 -- Expand_N_Accept_Statement --
3488 -------------------------------
3490 -- This procedure handles expansion of accept statements that stand
3491 -- alone, i.e. they are not part of an accept alternative. The expansion
3492 -- of accept statement in accept alternatives is handled by the routines
3493 -- Expand_N_Accept_Alternative and Expand_N_Selective_Accept. The
3494 -- following description applies only to stand alone accept statements.
3496 -- If there is no handled statement sequence, or only null statements,
3497 -- then this is called a trivial accept, and the expansion is:
3499 -- Accept_Trivial (entry-index)
3501 -- If there is a handled statement sequence, then the expansion is:
3508 -- Accept_Call (entry-index, Ann);
3509 -- Renaming_Declarations for formals
3510 -- <statement sequence from N_Accept_Statement node>
3511 -- Complete_Rendezvous;
3516 -- <exception handler from N_Accept_Statement node>
3517 -- Complete_Rendezvous;
3519 -- <exception handler from N_Accept_Statement node>
3520 -- Complete_Rendezvous;
3525 -- when all others =>
3526 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
3529 -- The first three declarations were already inserted ahead of the
3530 -- accept statement by the Expand_Accept_Declarations procedure, which
3531 -- was called directly from the semantics during analysis of the accept.
3532 -- statement, before analyzing its contained statements.
3534 -- The declarations from the N_Accept_Statement, as noted in Sinfo, come
3535 -- from possible expansion activity (the original source of course does
3536 -- not have any declarations associated with the accept statement, since
3537 -- an accept statement has no declarative part). In particular, if the
3538 -- expander is active, the first such declaration is the declaration of
3539 -- the Accept_Params_Ptr entity (see Sem_Ch9.Analyze_Accept_Statement).
3541 -- The two blocks are merged into a single block if the inner block has
3542 -- no exception handlers, but otherwise two blocks are required, since
3543 -- exceptions might be raised in the exception handlers of the inner
3544 -- block, and Exceptional_Complete_Rendezvous must be called.
3546 procedure Expand_N_Accept_Statement (N : Node_Id) is
3547 Loc : constant Source_Ptr := Sloc (N);
3548 Stats : constant Node_Id := Handled_Statement_Sequence (N);
3549 Ename : constant Node_Id := Entry_Direct_Name (N);
3550 Eindx : constant Node_Id := Entry_Index (N);
3551 Eent : constant Entity_Id := Entity (Ename);
3552 Acstack : constant Elist_Id := Accept_Address (Eent);
3553 Ann : constant Entity_Id := Node (Last_Elmt (Acstack));
3554 Ttyp : constant Entity_Id := Etype (Scope (Eent));
3559 function Null_Statements (Stats : List_Id) return Boolean;
3560 -- Check for null statement sequence (i.e a list of labels and
3563 function Null_Statements (Stats : List_Id) return Boolean is
3567 Stmt := First (Stats);
3568 while Nkind (Stmt) /= N_Empty
3569 and then (Nkind (Stmt) = N_Null_Statement
3571 Nkind (Stmt) = N_Label)
3576 return Nkind (Stmt) = N_Empty;
3577 end Null_Statements;
3579 -- Start of processing for Expand_N_Accept_Statement
3582 -- If accept statement is not part of a list, then its parent must be
3583 -- an accept alternative, and, as described above, we do not do any
3584 -- expansion for such accept statements at this level.
3586 if not Is_List_Member (N) then
3587 pragma Assert (Nkind (Parent (N)) = N_Accept_Alternative);
3590 -- Trivial accept case (no statement sequence, or null statements).
3591 -- If the accept statement has declarations, then just insert them
3592 -- before the procedure call.
3594 -- We avoid this optimization when FIFO_Within_Priorities is active,
3595 -- since it is not correct according to annex D semantics. The problem
3596 -- is that the call is required to reorder the acceptors position on
3597 -- its ready queue, even though there is nothing to be done. However,
3598 -- if no policy is specified, then we decide that our dispatching
3599 -- policy always reorders the queue right after the RV to look the
3600 -- way they were just before the RV. Since we are allowed to freely
3601 -- reorder same-priority queues (this is part of what dispatching
3602 -- policies are all about), the optimization is legitimate.
3604 elsif Opt.Task_Dispatching_Policy /= 'F'
3605 and then (No (Stats) or else Null_Statements (Statements (Stats)))
3607 -- Remove declarations for renamings, because the parameter block
3608 -- will not be assigned.
3615 D := First (Declarations (N));
3617 while Present (D) loop
3619 if Nkind (D) = N_Object_Renaming_Declaration then
3627 if Present (Declarations (N)) then
3628 Insert_Actions (N, Declarations (N));
3632 Make_Procedure_Call_Statement (Loc,
3633 Name => New_Reference_To (RTE (RE_Accept_Trivial), Loc),
3634 Parameter_Associations => New_List (
3635 Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp))));
3639 -- Discard Entry_Address that was created for it, so it will not be
3640 -- emitted if this accept statement is in the statement part of a
3641 -- delay alternative.
3643 if Present (Stats) then
3644 Remove_Last_Elmt (Acstack);
3647 -- Case of statement sequence present
3650 -- Construct the block, using the declarations from the accept
3651 -- statement if any to initialize the declarations of the block.
3653 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
3654 Set_Ekind (Blkent, E_Block);
3655 Set_Etype (Blkent, Standard_Void_Type);
3656 Set_Scope (Blkent, Current_Scope);
3659 Make_Block_Statement (Loc,
3660 Identifier => New_Reference_To (Blkent, Loc),
3661 Declarations => Declarations (N),
3662 Handled_Statement_Sequence => Build_Accept_Body (N));
3664 -- Prepend call to Accept_Call to main statement sequence
3665 -- If the accept has exception handlers, the statement sequence
3666 -- is wrapped in a block. Insert call and renaming declarations
3667 -- in the declarations of the block, so they are elaborated before
3671 Make_Procedure_Call_Statement (Loc,
3672 Name => New_Reference_To (RTE (RE_Accept_Call), Loc),
3673 Parameter_Associations => New_List (
3674 Entry_Index_Expression (Loc, Entity (Ename), Eindx, Ttyp),
3675 New_Reference_To (Ann, Loc)));
3677 if Parent (Stats) = N then
3678 Prepend (Call, Statements (Stats));
3694 D := First (Declarations (N));
3696 while Present (D) loop
3699 if Nkind (D) = N_Object_Renaming_Declaration then
3700 -- The renaming declarations for the formals were
3701 -- created during analysis of the accept statement,
3702 -- and attached to the list of declarations. Place
3703 -- them now in the context of the accept block or
3707 Typ := Entity (Subtype_Mark (D));
3708 Insert_After (Call, D);
3711 -- If the formal is class_wide, it does not have an
3712 -- actual subtype. The analysis of the renaming declaration
3713 -- creates one, but we need to retain the class-wide
3714 -- nature of the entity.
3716 if Is_Class_Wide_Type (Typ) then
3717 Set_Etype (Defining_Identifier (D), Typ);
3728 -- Replace the accept statement by the new block
3733 -- Last step is to unstack the Accept_Address value
3735 Remove_Last_Elmt (Acstack);
3737 end Expand_N_Accept_Statement;
3739 ----------------------------------
3740 -- Expand_N_Asynchronous_Select --
3741 ----------------------------------
3743 -- This procedure assumes that the trigger statement is an entry
3744 -- call. A delay alternative should already have been expanded
3745 -- into an entry call to the appropriate delay object Wait entry.
3747 -- If the trigger is a task entry call, the select is implemented
3748 -- with Task_Entry_Call:
3753 -- P : parms := (parm, parm, parm);
3755 -- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions.
3757 -- procedure _clean is
3760 -- Cancel_Task_Entry_Call (C);
3770 -- Asynchronous_Call,
3778 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions.
3782 -- when Abort_Signal => Abort_Undefer;
3788 -- triggered-statements
3792 -- Note that Build_Simple_Entry_Call is used to expand the entry
3793 -- of the asynchronous entry call (by the
3794 -- Expand_N_Entry_Call_Statement procedure) as follows:
3797 -- P : parms := (parm, parm, parm);
3799 -- Call_Simple (acceptor-task, entry-index, P'Address);
3805 -- so the task at hand is to convert the latter expansion into the former
3807 -- If the trigger is a protected entry call, the select is
3808 -- implemented with Protected_Entry_Call:
3811 -- P : E1_Params := (param, param, param);
3812 -- Bnn : Communications_Block;
3816 -- -- Clean is added by Exp_Ch7.Expand_Cleanup_Actions.
3817 -- procedure _clean is
3820 -- if Enqueued (Bnn) then
3821 -- Cancel_Protected_Entry_Call (Bnn);
3828 -- Protected_Entry_Call (
3829 -- Object => po._object'Access,
3830 -- E => <entry index>;
3831 -- Uninterpreted_Data => P'Address;
3832 -- Mode => Asynchronous_Call;
3834 -- if Enqueued (Bnn) then
3838 -- _clean; -- Added by Exp_Ch7.Expand_Cleanup_Actions.
3842 -- when Abort_Signal =>
3847 -- if not Cancelled (Bnn) then
3848 -- triggered statements
3852 -- Build_Simple_Entry_Call is used to expand the all to a simple
3853 -- protected entry call:
3856 -- P : E1_Params := (param, param, param);
3857 -- Bnn : Communications_Block;
3860 -- Protected_Entry_Call (
3861 -- Object => po._object'Access,
3862 -- E => <entry index>;
3863 -- Uninterpreted_Data => P'Address;
3864 -- Mode => Simple_Call;
3871 -- The job is to convert this to the asynchronous form.
3873 -- If the trigger is a delay statement, it will have been expanded
3874 -- into a call to one of the GNARL delay procedures. This routine
3875 -- will convert this into a protected entry call on a delay object
3876 -- and then continue processing as for a protected entry call trigger.
3877 -- This requires declaring a Delay_Block object and adding a pointer
3878 -- to this object to the parameter list of the delay procedure to form
3879 -- the parameter list of the entry call. This object is used by
3880 -- the runtime to queue the delay request.
3882 -- For a description of the use of P and the assignments after the
3883 -- call, see Expand_N_Entry_Call_Statement.
3885 procedure Expand_N_Asynchronous_Select (N : Node_Id) is
3886 Loc : constant Source_Ptr := Sloc (N);
3887 Trig : constant Node_Id := Triggering_Alternative (N);
3888 Abrt : constant Node_Id := Abortable_Part (N);
3889 Tstats : constant List_Id := Statements (Trig);
3890 Astats : constant List_Id := Statements (Abrt);
3903 Enqueue_Call : Node_Id;
3907 Dblock_Ent : Entity_Id;
3909 Abortable_Block : Node_Id;
3910 Cancel_Param : Entity_Id;
3912 Target_Undefer : RE_Id;
3913 Undefer_Args : List_Id := No_List;
3916 Blkent := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
3917 Ecall := Triggering_Statement (Trig);
3919 -- The arguments in the call may require dynamic allocation, and the
3920 -- call statement may have been transformed into a block. The block
3921 -- may contain additional declarations for internal entities, and the
3922 -- original call is found by sequential search.
3924 if Nkind (Ecall) = N_Block_Statement then
3925 Ecall := First (Statements (Handled_Statement_Sequence (Ecall)));
3927 while Nkind (Ecall) /= N_Procedure_Call_Statement
3928 and then Nkind (Ecall) /= N_Entry_Call_Statement
3934 -- If a delay was used as a trigger, it will have been expanded
3935 -- into a procedure call. Convert it to the appropriate sequence of
3936 -- statements, similar to what is done for a task entry call.
3937 -- Note that this currently supports only Duration, Real_Time.Time,
3938 -- and Calendar.Time.
3940 if Nkind (Ecall) = N_Procedure_Call_Statement then
3942 -- Add a Delay_Block object to the parameter list of the
3943 -- delay procedure to form the parameter list of the Wait
3946 Dblock_Ent := Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
3948 Pdef := Entity (Name (Ecall));
3950 if Is_RTE (Pdef, RO_CA_Delay_For) then
3951 Enqueue_Call := New_Reference_To (RTE (RE_Enqueue_Duration), Loc);
3953 elsif Is_RTE (Pdef, RO_CA_Delay_Until) then
3954 Enqueue_Call := New_Reference_To (RTE (RE_Enqueue_Calendar), Loc);
3956 else pragma Assert (Is_RTE (Pdef, RO_RT_Delay_Until));
3957 Enqueue_Call := New_Reference_To (RTE (RE_Enqueue_RT), Loc);
3960 Append_To (Parameter_Associations (Ecall),
3961 Make_Attribute_Reference (Loc,
3962 Prefix => New_Reference_To (Dblock_Ent, Loc),
3963 Attribute_Name => Name_Unchecked_Access));
3965 -- Create the inner block to protect the abortable part.
3968 Make_Exception_Handler (Loc,
3969 Exception_Choices =>
3970 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
3971 Statements => New_List (
3972 Make_Procedure_Call_Statement (Loc,
3973 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)))));
3976 Make_Procedure_Call_Statement (Loc,
3977 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)));
3980 Make_Block_Statement (Loc,
3981 Identifier => New_Reference_To (Blkent, Loc),
3982 Handled_Statement_Sequence =>
3983 Make_Handled_Sequence_Of_Statements (Loc,
3984 Statements => Astats),
3985 Has_Created_Identifier => True,
3986 Is_Asynchronous_Call_Block => True);
3988 -- Append call to if Enqueue (When, DB'Unchecked_Access) then
3991 Make_Implicit_If_Statement (N,
3992 Condition => Make_Function_Call (Loc,
3993 Name => Enqueue_Call,
3994 Parameter_Associations => Parameter_Associations (Ecall)),
3996 New_List (Make_Block_Statement (Loc,
3997 Handled_Statement_Sequence =>
3998 Make_Handled_Sequence_Of_Statements (Loc,
3999 Statements => New_List (
4000 Make_Implicit_Label_Declaration (Loc,
4001 Defining_Identifier => Blkent,
4002 Label_Construct => Abortable_Block),
4004 Exception_Handlers => Hdle)))));
4006 Stmts := New_List (Ecall);
4008 -- Construct statement sequence for new block
4011 Make_Implicit_If_Statement (N,
4012 Condition => Make_Function_Call (Loc,
4013 Name => New_Reference_To (
4014 RTE (RE_Timed_Out), Loc),
4015 Parameter_Associations => New_List (
4016 Make_Attribute_Reference (Loc,
4017 Prefix => New_Reference_To (Dblock_Ent, Loc),
4018 Attribute_Name => Name_Unchecked_Access))),
4019 Then_Statements => Tstats));
4021 -- The result is the new block
4023 Set_Entry_Cancel_Parameter (Blkent, Dblock_Ent);
4026 Make_Block_Statement (Loc,
4027 Declarations => New_List (
4028 Make_Object_Declaration (Loc,
4029 Defining_Identifier => Dblock_Ent,
4030 Aliased_Present => True,
4031 Object_Definition => New_Reference_To (
4032 RTE (RE_Delay_Block), Loc))),
4034 Handled_Statement_Sequence =>
4035 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
4044 Extract_Entry (Ecall, Concval, Ename, Index);
4045 Build_Simple_Entry_Call (Ecall, Concval, Ename, Index);
4047 Stmts := Statements (Handled_Statement_Sequence (Ecall));
4048 Decls := Declarations (Ecall);
4050 if Is_Protected_Type (Etype (Concval)) then
4052 -- Get the declarations of the block expanded from the entry call
4054 Decl := First (Decls);
4055 while Present (Decl)
4056 and then (Nkind (Decl) /= N_Object_Declaration
4058 (Etype (Object_Definition (Decl)), RE_Communication_Block))
4063 pragma Assert (Present (Decl));
4064 Cancel_Param := Defining_Identifier (Decl);
4066 -- Change the mode of the Protected_Entry_Call call.
4067 -- Protected_Entry_Call (
4068 -- Object => po._object'Access,
4069 -- E => <entry index>;
4070 -- Uninterpreted_Data => P'Address;
4071 -- Mode => Asynchronous_Call;
4074 Stmt := First (Stmts);
4076 -- Skip assignments to temporaries created for in-out parameters.
4077 -- This makes unwarranted assumptions about the shape of the expanded
4078 -- tree for the call, and should be cleaned up ???
4080 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
4086 Parm := First (Parameter_Associations (Call));
4087 while Present (Parm)
4088 and then not Is_RTE (Etype (Parm), RE_Call_Modes)
4093 pragma Assert (Present (Parm));
4094 Rewrite (Parm, New_Reference_To (RTE (RE_Asynchronous_Call), Loc));
4097 -- Append an if statement to execute the abortable part.
4098 -- if Enqueued (Bnn) then
4101 Make_Implicit_If_Statement (N,
4102 Condition => Make_Function_Call (Loc,
4103 Name => New_Reference_To (
4104 RTE (RE_Enqueued), Loc),
4105 Parameter_Associations => New_List (
4106 New_Reference_To (Cancel_Param, Loc))),
4107 Then_Statements => Astats));
4110 Make_Block_Statement (Loc,
4111 Identifier => New_Reference_To (Blkent, Loc),
4112 Handled_Statement_Sequence =>
4113 Make_Handled_Sequence_Of_Statements (Loc,
4114 Statements => Stmts),
4115 Has_Created_Identifier => True,
4116 Is_Asynchronous_Call_Block => True);
4118 -- For the JVM call Update_Exception instead of Abort_Undefer.
4119 -- See 4jexcept.ads for an explanation.
4121 if Hostparm.Java_VM then
4122 Target_Undefer := RE_Update_Exception;
4124 New_List (Make_Function_Call (Loc,
4125 Name => New_Occurrence_Of
4126 (RTE (RE_Current_Target_Exception), Loc)));
4128 Target_Undefer := RE_Abort_Undefer;
4132 Make_Block_Statement (Loc,
4133 Handled_Statement_Sequence =>
4134 Make_Handled_Sequence_Of_Statements (Loc,
4135 Statements => New_List (
4136 Make_Implicit_Label_Declaration (Loc,
4137 Defining_Identifier => Blkent,
4138 Label_Construct => Abortable_Block),
4143 Exception_Handlers => New_List (
4144 Make_Exception_Handler (Loc,
4146 -- when Abort_Signal =>
4147 -- Abort_Undefer.all;
4149 Exception_Choices =>
4150 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
4151 Statements => New_List (
4152 Make_Procedure_Call_Statement (Loc,
4153 Name => New_Reference_To (
4154 RTE (Target_Undefer), Loc),
4155 Parameter_Associations => Undefer_Args)))))),
4157 -- if not Cancelled (Bnn) then
4158 -- triggered statements
4161 Make_Implicit_If_Statement (N,
4162 Condition => Make_Op_Not (Loc,
4164 Make_Function_Call (Loc,
4165 Name => New_Occurrence_Of (RTE (RE_Cancelled), Loc),
4166 Parameter_Associations => New_List (
4167 New_Occurrence_Of (Cancel_Param, Loc)))),
4168 Then_Statements => Tstats));
4170 -- Asynchronous task entry call
4177 B := Make_Defining_Identifier (Loc, Name_uB);
4179 -- Insert declaration of B in declarations of existing block
4182 Make_Object_Declaration (Loc,
4183 Defining_Identifier => B,
4184 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
4186 Cancel_Param := Make_Defining_Identifier (Loc, Name_uC);
4188 -- Insert declaration of C in declarations of existing block
4191 Make_Object_Declaration (Loc,
4192 Defining_Identifier => Cancel_Param,
4193 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
4195 -- Remove and save the call to Call_Simple.
4197 Stmt := First (Stmts);
4199 -- Skip assignments to temporaries created for in-out parameters.
4200 -- This makes unwarranted assumptions about the shape of the expanded
4201 -- tree for the call, and should be cleaned up ???
4203 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
4209 -- Create the inner block to protect the abortable part.
4212 Make_Exception_Handler (Loc,
4213 Exception_Choices =>
4214 New_List (New_Reference_To (Stand.Abort_Signal, Loc)),
4215 Statements => New_List (
4216 Make_Procedure_Call_Statement (Loc,
4217 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)))));
4220 Make_Procedure_Call_Statement (Loc,
4221 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc)));
4224 Make_Block_Statement (Loc,
4225 Identifier => New_Reference_To (Blkent, Loc),
4226 Handled_Statement_Sequence =>
4227 Make_Handled_Sequence_Of_Statements (Loc,
4228 Statements => Astats),
4229 Has_Created_Identifier => True,
4230 Is_Asynchronous_Call_Block => True);
4233 Make_Block_Statement (Loc,
4234 Handled_Statement_Sequence =>
4235 Make_Handled_Sequence_Of_Statements (Loc,
4236 Statements => New_List (
4237 Make_Implicit_Label_Declaration (Loc,
4238 Defining_Identifier => Blkent,
4239 Label_Construct => Abortable_Block),
4241 Exception_Handlers => Hdle)));
4243 -- Create new call statement
4245 Parms := Parameter_Associations (Call);
4246 Append_To (Parms, New_Reference_To (RTE (RE_Asynchronous_Call), Loc));
4247 Append_To (Parms, New_Reference_To (B, Loc));
4249 Make_Procedure_Call_Statement (Loc,
4250 Name => New_Reference_To (RTE (RE_Task_Entry_Call), Loc),
4251 Parameter_Associations => Parms));
4253 -- Construct statement sequence for new block
4256 Make_Implicit_If_Statement (N,
4257 Condition => Make_Op_Not (Loc,
4258 New_Reference_To (Cancel_Param, Loc)),
4259 Then_Statements => Tstats));
4261 -- Protected the call against abortion
4264 Make_Procedure_Call_Statement (Loc,
4265 Name => New_Reference_To (RTE (RE_Abort_Defer), Loc),
4266 Parameter_Associations => Empty_List));
4269 Set_Entry_Cancel_Parameter (Blkent, Cancel_Param);
4271 -- The result is the new block
4274 Make_Block_Statement (Loc,
4275 Declarations => Decls,
4276 Handled_Statement_Sequence =>
4277 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
4280 end Expand_N_Asynchronous_Select;
4282 -------------------------------------
4283 -- Expand_N_Conditional_Entry_Call --
4284 -------------------------------------
4286 -- The conditional task entry call is converted to a call to
4291 -- P : parms := (parm, parm, parm);
4298 -- Conditional_Call,
4304 -- normal-statements
4310 -- For a description of the use of P and the assignments after the
4311 -- call, see Expand_N_Entry_Call_Statement. Note that the entry call
4312 -- of the conditional entry call has already been expanded (by the
4313 -- Expand_N_Entry_Call_Statement procedure) as follows:
4316 -- P : parms := (parm, parm, parm);
4318 -- ... info for in-out parameters
4319 -- Call_Simple (acceptor-task, entry-index, P'Address);
4325 -- so the task at hand is to convert the latter expansion into the former
4327 -- The conditional protected entry call is converted to a call to
4328 -- Protected_Entry_Call:
4331 -- P : parms := (parm, parm, parm);
4332 -- Bnn : Communications_Block;
4335 -- Protected_Entry_Call (
4336 -- Object => po._object'Access,
4337 -- E => <entry index>;
4338 -- Uninterpreted_Data => P'Address;
4339 -- Mode => Conditional_Call;
4344 -- if Cancelled (Bnn) then
4347 -- normal-statements
4351 -- As for tasks, the entry call of the conditional entry call has
4352 -- already been expanded (by the Expand_N_Entry_Call_Statement procedure)
4356 -- P : E1_Params := (param, param, param);
4357 -- Bnn : Communications_Block;
4360 -- Protected_Entry_Call (
4361 -- Object => po._object'Access,
4362 -- E => <entry index>;
4363 -- Uninterpreted_Data => P'Address;
4364 -- Mode => Simple_Call;
4371 procedure Expand_N_Conditional_Entry_Call (N : Node_Id) is
4372 Loc : constant Source_Ptr := Sloc (N);
4373 Alt : constant Node_Id := Entry_Call_Alternative (N);
4374 Blk : Node_Id := Entry_Call_Statement (Alt);
4375 Transient_Blk : Node_Id;
4386 -- As described above, The entry alternative is transformed into a
4387 -- block that contains the gnulli call, and possibly assignment
4388 -- statements for in-out parameters. The gnulli call may itself be
4389 -- rewritten into a transient block if some unconstrained parameters
4390 -- require it. We need to retrieve the call to complete its parameter
4394 First_Real_Statement (Handled_Statement_Sequence (Blk));
4396 if Present (Transient_Blk)
4398 Nkind (Transient_Blk) = N_Block_Statement
4400 Blk := Transient_Blk;
4403 Stmts := Statements (Handled_Statement_Sequence (Blk));
4405 Stmt := First (Stmts);
4407 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
4413 Parms := Parameter_Associations (Call);
4415 if Is_RTE (Entity (Name (Call)), RE_Protected_Entry_Call) then
4417 -- Substitute Conditional_Entry_Call for Simple_Call
4420 Parm := First (Parms);
4421 while Present (Parm)
4422 and then not Is_RTE (Etype (Parm), RE_Call_Modes)
4427 pragma Assert (Present (Parm));
4428 Rewrite (Parm, New_Reference_To (RTE (RE_Conditional_Call), Loc));
4432 -- Find the Communication_Block parameter for the call
4433 -- to the Cancelled function.
4435 Decl := First (Declarations (Blk));
4436 while Present (Decl)
4438 Is_RTE (Etype (Object_Definition (Decl)), RE_Communication_Block)
4443 -- Add an if statement to execute the else part if the call
4444 -- does not succeed (as indicated by the Cancelled predicate).
4447 Make_Implicit_If_Statement (N,
4448 Condition => Make_Function_Call (Loc,
4449 Name => New_Reference_To (RTE (RE_Cancelled), Loc),
4450 Parameter_Associations => New_List (
4451 New_Reference_To (Defining_Identifier (Decl), Loc))),
4452 Then_Statements => Else_Statements (N),
4453 Else_Statements => Statements (Alt)));
4456 B := Make_Defining_Identifier (Loc, Name_uB);
4458 -- Insert declaration of B in declarations of existing block
4460 if No (Declarations (Blk)) then
4461 Set_Declarations (Blk, New_List);
4464 Prepend_To (Declarations (Blk),
4465 Make_Object_Declaration (Loc,
4466 Defining_Identifier => B,
4467 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
4469 -- Create new call statement
4471 Append_To (Parms, New_Reference_To (RTE (RE_Conditional_Call), Loc));
4472 Append_To (Parms, New_Reference_To (B, Loc));
4475 Make_Procedure_Call_Statement (Loc,
4476 Name => New_Reference_To (RTE (RE_Task_Entry_Call), Loc),
4477 Parameter_Associations => Parms));
4479 -- Construct statement sequence for new block
4482 Make_Implicit_If_Statement (N,
4483 Condition => New_Reference_To (B, Loc),
4484 Then_Statements => Statements (Alt),
4485 Else_Statements => Else_Statements (N)));
4489 -- The result is the new block
4492 Make_Block_Statement (Loc,
4493 Declarations => Declarations (Blk),
4494 Handled_Statement_Sequence =>
4495 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
4498 end Expand_N_Conditional_Entry_Call;
4500 ---------------------------------------
4501 -- Expand_N_Delay_Relative_Statement --
4502 ---------------------------------------
4504 -- Delay statement is implemented as a procedure call to Delay_For
4505 -- defined in Ada.Calendar.Delays in order to reduce the overhead of
4506 -- simple delays imposed by the use of Protected Objects.
4508 procedure Expand_N_Delay_Relative_Statement (N : Node_Id) is
4509 Loc : constant Source_Ptr := Sloc (N);
4513 Make_Procedure_Call_Statement (Loc,
4514 Name => New_Reference_To (RTE (RO_CA_Delay_For), Loc),
4515 Parameter_Associations => New_List (Expression (N))));
4517 end Expand_N_Delay_Relative_Statement;
4519 ------------------------------------
4520 -- Expand_N_Delay_Until_Statement --
4521 ------------------------------------
4523 -- Delay Until statement is implemented as a procedure call to
4524 -- Delay_Until defined in Ada.Calendar.Delays and Ada.Real_Time.Delays.
4526 procedure Expand_N_Delay_Until_Statement (N : Node_Id) is
4527 Loc : constant Source_Ptr := Sloc (N);
4531 if Is_RTE (Base_Type (Etype (Expression (N))), RO_CA_Time) then
4532 Typ := RTE (RO_CA_Delay_Until);
4534 Typ := RTE (RO_RT_Delay_Until);
4538 Make_Procedure_Call_Statement (Loc,
4539 Name => New_Reference_To (Typ, Loc),
4540 Parameter_Associations => New_List (Expression (N))));
4543 end Expand_N_Delay_Until_Statement;
4545 -------------------------
4546 -- Expand_N_Entry_Body --
4547 -------------------------
4549 procedure Expand_N_Entry_Body (N : Node_Id) is
4550 Loc : constant Source_Ptr := Sloc (N);
4551 Dec : constant Node_Id := Parent (Current_Scope);
4552 Ent_Formals : constant Node_Id := Entry_Body_Formal_Part (N);
4553 Index_Spec : constant Node_Id :=
4554 Entry_Index_Specification (Ent_Formals);
4556 First_Decl : constant Node_Id := First (Declarations (N));
4557 Index_Decl : List_Id;
4560 -- Add the renamings for private declarations and discriminants.
4562 Add_Discriminal_Declarations
4563 (Declarations (N), Defining_Identifier (Dec), Name_uObject, Loc);
4564 Add_Private_Declarations
4565 (Declarations (N), Defining_Identifier (Dec), Name_uObject, Loc);
4567 if Present (Index_Spec) then
4569 Index_Constant_Declaration
4571 Defining_Identifier (Index_Spec), Defining_Identifier (Dec));
4573 -- If the entry has local declarations, insert index declaration
4574 -- before them, because the index may be used therein.
4576 if Present (First_Decl) then
4577 Insert_List_Before (First_Decl, Index_Decl);
4579 Append_List_To (Declarations (N), Index_Decl);
4583 -- Associate privals and discriminals with the next protected
4584 -- operation body to be expanded. These are used to expand
4585 -- references to private data objects and discriminants,
4588 Next_Op := Next_Protected_Operation (N);
4590 if Present (Next_Op) then
4591 Set_Privals (Dec, Next_Op, Loc);
4592 Set_Discriminals (Dec);
4594 end Expand_N_Entry_Body;
4596 -----------------------------------
4597 -- Expand_N_Entry_Call_Statement --
4598 -----------------------------------
4600 -- An entry call is expanded into GNARLI calls to implement
4601 -- a simple entry call (see Build_Simple_Entry_Call).
4603 procedure Expand_N_Entry_Call_Statement (N : Node_Id) is
4609 if No_Run_Time_Mode then
4610 Error_Msg_CRT ("entry call", N);
4614 -- If this entry call is part of an asynchronous select, don't
4615 -- expand it here; it will be expanded with the select statement.
4616 -- Don't expand timed entry calls either, as they are translated
4617 -- into asynchronous entry calls.
4619 -- ??? This whole approach is questionable; it may be better
4620 -- to go back to allowing the expansion to take place and then
4621 -- attempting to fix it up in Expand_N_Asynchronous_Select.
4622 -- The tricky part is figuring out whether the expanded
4623 -- call is on a task or protected entry.
4625 if (Nkind (Parent (N)) /= N_Triggering_Alternative
4626 or else N /= Triggering_Statement (Parent (N)))
4627 and then (Nkind (Parent (N)) /= N_Entry_Call_Alternative
4628 or else N /= Entry_Call_Statement (Parent (N))
4629 or else Nkind (Parent (Parent (N))) /= N_Timed_Entry_Call)
4631 Extract_Entry (N, Concval, Ename, Index);
4632 Build_Simple_Entry_Call (N, Concval, Ename, Index);
4634 end Expand_N_Entry_Call_Statement;
4636 --------------------------------
4637 -- Expand_N_Entry_Declaration --
4638 --------------------------------
4640 -- If there are parameters, then first, each of the formals is marked
4641 -- by setting Is_Entry_Formal. Next a record type is built which is
4642 -- used to hold the parameter values. The name of this record type is
4643 -- entryP where entry is the name of the entry, with an additional
4644 -- corresponding access type called entryPA. The record type has matching
4645 -- components for each formal (the component names are the same as the
4646 -- formal names). For elementary types, the component type matches the
4647 -- formal type. For composite types, an access type is declared (with
4648 -- the name formalA) which designates the formal type, and the type of
4649 -- the component is this access type. Finally the Entry_Component of
4650 -- each formal is set to reference the corresponding record component.
4652 procedure Expand_N_Entry_Declaration (N : Node_Id) is
4653 Loc : constant Source_Ptr := Sloc (N);
4654 Entry_Ent : constant Entity_Id := Defining_Identifier (N);
4655 Components : List_Id;
4658 Last_Decl : Node_Id;
4659 Component : Entity_Id;
4662 Rec_Ent : Entity_Id;
4663 Acc_Ent : Entity_Id;
4666 Formal := First_Formal (Entry_Ent);
4669 -- Most processing is done only if parameters are present
4671 if Present (Formal) then
4672 Components := New_List;
4674 -- Loop through formals
4676 while Present (Formal) loop
4677 Set_Is_Entry_Formal (Formal);
4679 Make_Defining_Identifier (Sloc (Formal), Chars (Formal));
4680 Set_Entry_Component (Formal, Component);
4681 Set_Entry_Formal (Component, Formal);
4682 Ftype := Etype (Formal);
4684 -- Declare new access type and then append
4687 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
4690 Make_Full_Type_Declaration (Loc,
4691 Defining_Identifier => Ctype,
4693 Make_Access_To_Object_Definition (Loc,
4694 All_Present => True,
4695 Constant_Present => Ekind (Formal) = E_In_Parameter,
4696 Subtype_Indication => New_Reference_To (Ftype, Loc)));
4698 Insert_After (Last_Decl, Decl);
4701 Append_To (Components,
4702 Make_Component_Declaration (Loc,
4703 Defining_Identifier => Component,
4704 Component_Definition =>
4705 Make_Component_Definition (Loc,
4706 Aliased_Present => False,
4707 Subtype_Indication => New_Reference_To (Ctype, Loc))));
4709 Next_Formal_With_Extras (Formal);
4712 -- Create the Entry_Parameter_Record declaration
4715 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
4718 Make_Full_Type_Declaration (Loc,
4719 Defining_Identifier => Rec_Ent,
4721 Make_Record_Definition (Loc,
4723 Make_Component_List (Loc,
4724 Component_Items => Components)));
4726 Insert_After (Last_Decl, Decl);
4729 -- Construct and link in the corresponding access type
4732 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
4734 Set_Entry_Parameters_Type (Entry_Ent, Acc_Ent);
4737 Make_Full_Type_Declaration (Loc,
4738 Defining_Identifier => Acc_Ent,
4740 Make_Access_To_Object_Definition (Loc,
4741 All_Present => True,
4742 Subtype_Indication => New_Reference_To (Rec_Ent, Loc)));
4744 Insert_After (Last_Decl, Decl);
4747 end Expand_N_Entry_Declaration;
4749 -----------------------------
4750 -- Expand_N_Protected_Body --
4751 -----------------------------
4753 -- Protected bodies are expanded to the completion of the subprograms
4754 -- created for the corresponding protected type. These are a protected
4755 -- and unprotected version of each protected subprogram in the object,
4756 -- a function to calculate each entry barrier, and a procedure to
4757 -- execute the sequence of statements of each protected entry body.
4758 -- For example, for protected type ptype:
4761 -- (O : System.Address;
4762 -- E : Protected_Entry_Index)
4765 -- <discriminant renamings>
4766 -- <private object renamings>
4768 -- return <barrier expression>;
4771 -- procedure pprocN (_object : in out poV;...) is
4772 -- <discriminant renamings>
4773 -- <private object renamings>
4775 -- <sequence of statements>
4778 -- procedure pproc (_object : in out poV;...) is
4779 -- procedure _clean is
4782 -- ptypeS (_object, Pn);
4783 -- Unlock (_object._object'Access);
4784 -- Abort_Undefer.all;
4789 -- Lock (_object._object'Access);
4790 -- pprocN (_object;...);
4795 -- function pfuncN (_object : poV;...) return Return_Type is
4796 -- <discriminant renamings>
4797 -- <private object renamings>
4799 -- <sequence of statements>
4802 -- function pfunc (_object : poV) return Return_Type is
4803 -- procedure _clean is
4805 -- Unlock (_object._object'Access);
4806 -- Abort_Undefer.all;
4811 -- Lock (_object._object'Access);
4812 -- return pfuncN (_object);
4819 -- (O : System.Address;
4820 -- P : System.Address;
4821 -- E : Protected_Entry_Index)
4823 -- <discriminant renamings>
4824 -- <private object renamings>
4825 -- type poVP is access poV;
4826 -- _Object : ptVP := ptVP!(O);
4830 -- <statement sequence>
4831 -- Complete_Entry_Body (_Object._Object);
4833 -- when all others =>
4834 -- Exceptional_Complete_Entry_Body (
4835 -- _Object._Object, Get_GNAT_Exception);
4839 -- The type poV is the record created for the protected type to hold
4840 -- the state of the protected object.
4842 procedure Expand_N_Protected_Body (N : Node_Id) is
4843 Pid : constant Entity_Id := Corresponding_Spec (N);
4844 Has_Entries : Boolean := False;
4848 New_Op_Body : Node_Id;
4849 Current_Node : Node_Id;
4850 Num_Entries : Natural := 0;
4853 if No_Run_Time_Mode then
4854 Error_Msg_CRT ("protected body", N);
4858 if Nkind (Parent (N)) = N_Subunit then
4860 -- This is the proper body corresponding to a stub. The declarations
4861 -- must be inserted at the point of the stub, which is in the decla-
4862 -- rative part of the parent unit.
4864 Current_Node := Corresponding_Stub (Parent (N));
4870 Op_Body := First (Declarations (N));
4872 -- The protected body is replaced with the bodies of its
4873 -- protected operations, and the declarations for internal objects
4874 -- that may have been created for entry family bounds.
4876 Rewrite (N, Make_Null_Statement (Sloc (N)));
4879 while Present (Op_Body) loop
4880 case Nkind (Op_Body) is
4881 when N_Subprogram_Declaration =>
4884 when N_Subprogram_Body =>
4886 -- Exclude functions created to analyze defaults.
4888 if not Is_Eliminated (Defining_Entity (Op_Body))
4889 and then not Is_Eliminated (Corresponding_Spec (Op_Body))
4892 Build_Unprotected_Subprogram_Body (Op_Body, Pid);
4894 Insert_After (Current_Node, New_Op_Body);
4895 Current_Node := New_Op_Body;
4896 Analyze (New_Op_Body);
4898 Update_Prival_Subtypes (New_Op_Body);
4900 -- Build the corresponding protected operation only if
4901 -- this is a visible operation of the type, or if it is
4902 -- an interrupt handler. Otherwise it is only callable
4903 -- from within the object, and the unprotected version
4906 if Present (Corresponding_Spec (Op_Body)) then
4908 Unit_Declaration_Node (Corresponding_Spec (Op_Body));
4910 if Nkind (Parent (Op_Decl)) = N_Protected_Definition
4912 (List_Containing (Op_Decl) =
4913 Visible_Declarations (Parent (Op_Decl))
4915 Is_Interrupt_Handler
4916 (Corresponding_Spec (Op_Body)))
4919 Build_Protected_Subprogram_Body (
4920 Op_Body, Pid, Specification (New_Op_Body));
4922 Insert_After (Current_Node, New_Op_Body);
4923 Analyze (New_Op_Body);
4928 when N_Entry_Body =>
4929 Op_Id := Defining_Identifier (Op_Body);
4930 Has_Entries := True;
4931 Num_Entries := Num_Entries + 1;
4933 New_Op_Body := Build_Protected_Entry (Op_Body, Op_Id, Pid);
4935 Insert_After (Current_Node, New_Op_Body);
4936 Current_Node := New_Op_Body;
4937 Analyze (New_Op_Body);
4939 Update_Prival_Subtypes (New_Op_Body);
4941 when N_Implicit_Label_Declaration =>
4944 when N_Itype_Reference =>
4945 Insert_After (Current_Node, New_Copy (Op_Body));
4947 when N_Freeze_Entity =>
4948 New_Op_Body := New_Copy (Op_Body);
4950 if Present (Entity (Op_Body))
4951 and then Freeze_Node (Entity (Op_Body)) = Op_Body
4953 Set_Freeze_Node (Entity (Op_Body), New_Op_Body);
4956 Insert_After (Current_Node, New_Op_Body);
4957 Current_Node := New_Op_Body;
4958 Analyze (New_Op_Body);
4961 New_Op_Body := New_Copy (Op_Body);
4962 Insert_After (Current_Node, New_Op_Body);
4963 Current_Node := New_Op_Body;
4964 Analyze (New_Op_Body);
4966 when N_Object_Declaration =>
4967 pragma Assert (not Comes_From_Source (Op_Body));
4968 New_Op_Body := New_Copy (Op_Body);
4969 Insert_After (Current_Node, New_Op_Body);
4970 Current_Node := New_Op_Body;
4971 Analyze (New_Op_Body);
4974 raise Program_Error;
4981 -- Finally, create the body of the function that maps an entry index
4982 -- into the corresponding body index, except when there is no entry,
4983 -- or in a ravenscar-like profile (no abort, no entry queue, 1 entry)
4986 and then (Abort_Allowed
4987 or else Restriction_Active (No_Entry_Queue) = False
4988 or else Num_Entries > 1)
4990 New_Op_Body := Build_Find_Body_Index (Pid);
4991 Insert_After (Current_Node, New_Op_Body);
4992 Analyze (New_Op_Body);
4994 end Expand_N_Protected_Body;
4996 -----------------------------------------
4997 -- Expand_N_Protected_Type_Declaration --
4998 -----------------------------------------
5000 -- First we create a corresponding record type declaration used to
5001 -- represent values of this protected type.
5002 -- The general form of this type declaration is
5004 -- type poV (discriminants) is record
5005 -- _Object : aliased <kind>Protection
5006 -- [(<entry count> [, <handler count>])];
5007 -- [entry_family : array (bounds) of Void;]
5008 -- <private data fields>
5011 -- The discriminants are present only if the corresponding protected
5012 -- type has discriminants, and they exactly mirror the protected type
5013 -- discriminants. The private data fields similarly mirror the
5014 -- private declarations of the protected type.
5016 -- The Object field is always present. It contains RTS specific data
5017 -- used to control the protected object. It is declared as Aliased
5018 -- so that it can be passed as a pointer to the RTS. This allows the
5019 -- protected record to be referenced within RTS data structures.
5020 -- An appropriate Protection type and discriminant are generated.
5022 -- The Service field is present for protected objects with entries. It
5023 -- contains sufficient information to allow the entry service procedure
5024 -- for this object to be called when the object is not known till runtime.
5026 -- One entry_family component is present for each entry family in the
5027 -- task definition (see Expand_N_Task_Type_Declaration).
5029 -- When a protected object is declared, an instance of the protected type
5030 -- value record is created. The elaboration of this declaration creates
5031 -- the correct bounds for the entry families, and also evaluates the
5032 -- priority expression if needed. The initialization routine for
5033 -- the protected type itself then calls Initialize_Protection with
5034 -- appropriate parameters to initialize the value of the Task_Id field.
5035 -- Install_Handlers may be also called if a pragma Attach_Handler applies.
5037 -- Note: this record is passed to the subprograms created by the
5038 -- expansion of protected subprograms and entries. It is an in parameter
5039 -- to protected functions and an in out parameter to procedures and
5040 -- entry bodies. The Entity_Id for this created record type is placed
5041 -- in the Corresponding_Record_Type field of the associated protected
5044 -- Next we create a procedure specifications for protected subprograms
5045 -- and entry bodies. For each protected subprograms two subprograms are
5046 -- created, an unprotected and a protected version. The unprotected
5047 -- version is called from within other operations of the same protected
5050 -- We also build the call to register the procedure if a pragma
5051 -- Interrupt_Handler applies.
5053 -- A single subprogram is created to service all entry bodies; it has an
5054 -- additional boolean out parameter indicating that the previous entry
5055 -- call made by the current task was serviced immediately, i.e. not by
5056 -- proxy. The O parameter contains a pointer to a record object of the
5057 -- type described above. An untyped interface is used here to allow this
5058 -- procedure to be called in places where the type of the object to be
5059 -- serviced is not known. This must be done, for example, when a call
5060 -- that may have been requeued is cancelled; the corresponding object
5061 -- must be serviced, but which object that is not known till runtime.
5064 -- (O : System.Address; P : out Boolean);
5065 -- procedure pprocN (_object : in out poV);
5066 -- procedure pproc (_object : in out poV);
5067 -- function pfuncN (_object : poV);
5068 -- function pfunc (_object : poV);
5071 -- Note that this must come after the record type declaration, since
5072 -- the specs refer to this type.
5074 procedure Expand_N_Protected_Type_Declaration (N : Node_Id) is
5075 Loc : constant Source_Ptr := Sloc (N);
5076 Prottyp : constant Entity_Id := Defining_Identifier (N);
5077 Protnm : constant Name_Id := Chars (Prottyp);
5079 Pdef : constant Node_Id := Protected_Definition (N);
5080 -- This contains two lists; one for visible and one for private decls
5084 Discr_Map : constant Elist_Id := New_Elmt_List;
5089 Comp_Id : Entity_Id;
5091 Current_Node : Node_Id := N;
5092 Bdef : Entity_Id := Empty; -- avoid uninit warning
5093 Edef : Entity_Id := Empty; -- avoid uninit warning
5094 Entries_Aggr : Node_Id;
5095 Body_Id : Entity_Id;
5098 Object_Comp : Node_Id;
5100 procedure Register_Handler;
5101 -- for a protected operation that is an interrupt handler, add the
5102 -- freeze action that will register it as such.
5104 ----------------------
5105 -- Register_Handler --
5106 ----------------------
5108 procedure Register_Handler is
5110 -- All semantic checks already done in Sem_Prag
5112 Prot_Proc : constant Entity_Id :=
5114 (Specification (Current_Node));
5116 Proc_Address : constant Node_Id :=
5117 Make_Attribute_Reference (Loc,
5118 Prefix => New_Reference_To (Prot_Proc, Loc),
5119 Attribute_Name => Name_Address);
5121 RTS_Call : constant Entity_Id :=
5122 Make_Procedure_Call_Statement (Loc,
5125 RTE (RE_Register_Interrupt_Handler), Loc),
5126 Parameter_Associations =>
5127 New_List (Proc_Address));
5129 Append_Freeze_Action (Prot_Proc, RTS_Call);
5130 end Register_Handler;
5132 -- Start of processing for Expand_N_Protected_Type_Declaration
5135 if Present (Corresponding_Record_Type (Prottyp)) then
5138 Rec_Decl := Build_Corresponding_Record (N, Prottyp, Loc);
5139 Cdecls := Component_Items
5140 (Component_List (Type_Definition (Rec_Decl)));
5143 Qualify_Entity_Names (N);
5145 -- If the type has discriminants, their occurrences in the declaration
5146 -- have been replaced by the corresponding discriminals. For components
5147 -- that are constrained by discriminants, their homologues in the
5148 -- corresponding record type must refer to the discriminants of that
5149 -- record, so we must apply a new renaming to subtypes_indications:
5151 -- protected discriminant => discriminal => record discriminant.
5152 -- This replacement is not applied to default expressions, for which
5153 -- the discriminal is correct.
5155 if Has_Discriminants (Prottyp) then
5161 Disc := First_Discriminant (Prottyp);
5162 Decl := First (Discriminant_Specifications (Rec_Decl));
5164 while Present (Disc) loop
5165 Append_Elmt (Discriminal (Disc), Discr_Map);
5166 Append_Elmt (Defining_Identifier (Decl), Discr_Map);
5167 Next_Discriminant (Disc);
5173 -- Fill in the component declarations
5175 -- Add components for entry families. For each entry family,
5176 -- create an anonymous type declaration with the same size, and
5177 -- analyze the type.
5179 Collect_Entry_Families (Loc, Cdecls, Current_Node, Prottyp);
5181 -- Prepend the _Object field with the right type to the component
5182 -- list. We need to compute the number of entries, and in some cases
5183 -- the number of Attach_Handler pragmas.
5187 Num_Attach_Handler : Int := 0;
5188 Protection_Subtype : Node_Id;
5189 Entry_Count_Expr : constant Node_Id :=
5190 Build_Entry_Count_Expression
5191 (Prottyp, Cdecls, Loc);
5194 if Has_Attach_Handler (Prottyp) then
5195 Ritem := First_Rep_Item (Prottyp);
5196 while Present (Ritem) loop
5197 if Nkind (Ritem) = N_Pragma
5198 and then Chars (Ritem) = Name_Attach_Handler
5200 Num_Attach_Handler := Num_Attach_Handler + 1;
5203 Next_Rep_Item (Ritem);
5206 if Restricted_Profile then
5207 if Has_Entries (Prottyp) then
5208 Protection_Subtype :=
5209 New_Reference_To (RTE (RE_Protection_Entry), Loc);
5211 Protection_Subtype :=
5212 New_Reference_To (RTE (RE_Protection), Loc);
5215 Protection_Subtype :=
5216 Make_Subtype_Indication
5220 (RTE (RE_Static_Interrupt_Protection), Loc),
5222 Make_Index_Or_Discriminant_Constraint (
5224 Constraints => New_List (
5226 Make_Integer_Literal (Loc, Num_Attach_Handler))));
5229 elsif Has_Interrupt_Handler (Prottyp) then
5230 Protection_Subtype :=
5231 Make_Subtype_Indication (
5233 Subtype_Mark => New_Reference_To
5234 (RTE (RE_Dynamic_Interrupt_Protection), Loc),
5236 Make_Index_Or_Discriminant_Constraint (
5238 Constraints => New_List (Entry_Count_Expr)));
5240 elsif Has_Entries (Prottyp) then
5242 or else Restriction_Active (No_Entry_Queue) = False
5243 or else Number_Entries (Prottyp) > 1
5245 Protection_Subtype :=
5246 Make_Subtype_Indication (
5249 New_Reference_To (RTE (RE_Protection_Entries), Loc),
5251 Make_Index_Or_Discriminant_Constraint (
5253 Constraints => New_List (Entry_Count_Expr)));
5256 Protection_Subtype :=
5257 New_Reference_To (RTE (RE_Protection_Entry), Loc);
5261 Protection_Subtype := New_Reference_To (RTE (RE_Protection), Loc);
5265 Make_Component_Declaration (Loc,
5266 Defining_Identifier =>
5267 Make_Defining_Identifier (Loc, Name_uObject),
5268 Component_Definition =>
5269 Make_Component_Definition (Loc,
5270 Aliased_Present => True,
5271 Subtype_Indication => Protection_Subtype));
5274 pragma Assert (Present (Pdef));
5276 -- Add private field components
5278 if Present (Private_Declarations (Pdef)) then
5279 Priv := First (Private_Declarations (Pdef));
5281 while Present (Priv) loop
5283 if Nkind (Priv) = N_Component_Declaration then
5284 Pent := Defining_Identifier (Priv);
5286 Make_Component_Declaration (Loc,
5287 Defining_Identifier =>
5288 Make_Defining_Identifier (Sloc (Pent), Chars (Pent)),
5289 Component_Definition =>
5290 Make_Component_Definition (Sloc (Pent),
5291 Aliased_Present => False,
5292 Subtype_Indication =>
5293 New_Copy_Tree (Subtype_Indication
5294 (Component_Definition (Priv)),
5296 Expression => Expression (Priv));
5298 Append_To (Cdecls, New_Priv);
5300 elsif Nkind (Priv) = N_Subprogram_Declaration then
5302 -- Make the unprotected version of the subprogram available
5303 -- for expansion of intra object calls. There is need for
5304 -- a protected version only if the subprogram is an interrupt
5305 -- handler, otherwise this operation can only be called from
5309 Make_Subprogram_Declaration (Loc,
5311 Build_Protected_Sub_Specification
5312 (Priv, Prottyp, Unprotected => True));
5314 Insert_After (Current_Node, Sub);
5317 Set_Protected_Body_Subprogram
5318 (Defining_Unit_Name (Specification (Priv)),
5319 Defining_Unit_Name (Specification (Sub)));
5321 Current_Node := Sub;
5322 if Is_Interrupt_Handler
5323 (Defining_Unit_Name (Specification (Priv)))
5326 Make_Subprogram_Declaration (Loc,
5328 Build_Protected_Sub_Specification
5329 (Priv, Prottyp, Unprotected => False));
5331 Insert_After (Current_Node, Sub);
5333 Current_Node := Sub;
5335 if not Restricted_Profile then
5345 -- Put the _Object component after the private component so that it
5346 -- be finalized early as required by 9.4 (20)
5348 Append_To (Cdecls, Object_Comp);
5350 Insert_After (Current_Node, Rec_Decl);
5351 Current_Node := Rec_Decl;
5353 -- Analyze the record declaration immediately after construction,
5354 -- because the initialization procedure is needed for single object
5355 -- declarations before the next entity is analyzed (the freeze call
5356 -- that generates this initialization procedure is found below).
5358 Analyze (Rec_Decl, Suppress => All_Checks);
5360 -- Collect pointers to entry bodies and their barriers, to be placed
5361 -- in the Entry_Bodies_Array for the type. For each entry/family we
5362 -- add an expression to the aggregate which is the initial value of
5363 -- this array. The array is declared after all protected subprograms.
5365 if Has_Entries (Prottyp) then
5367 Make_Aggregate (Loc, Expressions => New_List);
5370 Entries_Aggr := Empty;
5373 -- Build two new procedure specifications for each protected
5374 -- subprogram; one to call from outside the object and one to
5375 -- call from inside. Build a barrier function and an entry
5376 -- body action procedure specification for each protected entry.
5377 -- Initialize the entry body array. If subprogram is flagged as
5378 -- eliminated, do not generate any internal operations.
5382 Comp := First (Visible_Declarations (Pdef));
5384 while Present (Comp) loop
5385 if Nkind (Comp) = N_Subprogram_Declaration
5386 and then not Is_Eliminated (Defining_Entity (Comp))
5389 Make_Subprogram_Declaration (Loc,
5391 Build_Protected_Sub_Specification
5392 (Comp, Prottyp, Unprotected => True));
5394 Insert_After (Current_Node, Sub);
5397 Set_Protected_Body_Subprogram
5398 (Defining_Unit_Name (Specification (Comp)),
5399 Defining_Unit_Name (Specification (Sub)));
5401 -- Make the protected version of the subprogram available
5402 -- for expansion of external calls.
5404 Current_Node := Sub;
5407 Make_Subprogram_Declaration (Loc,
5409 Build_Protected_Sub_Specification
5410 (Comp, Prottyp, Unprotected => False));
5412 Insert_After (Current_Node, Sub);
5414 Current_Node := Sub;
5416 -- If a pragma Interrupt_Handler applies, build and add
5417 -- a call to Register_Interrupt_Handler to the freezing actions
5418 -- of the protected version (Current_Node) of the subprogram:
5419 -- system.interrupts.register_interrupt_handler
5420 -- (prot_procP'address);
5422 if not Restricted_Profile
5423 and then Is_Interrupt_Handler
5424 (Defining_Unit_Name (Specification (Comp)))
5429 elsif Nkind (Comp) = N_Entry_Declaration then
5430 E_Count := E_Count + 1;
5431 Comp_Id := Defining_Identifier (Comp);
5432 Set_Privals_Chain (Comp_Id, New_Elmt_List);
5434 Make_Defining_Identifier (Loc,
5437 New_External_Name (Chars (Comp_Id), Suffix_Index => -1),
5440 Make_Subprogram_Declaration (Loc,
5442 Build_Protected_Entry_Specification (Edef, Comp_Id, Loc));
5444 Insert_After (Current_Node, Sub);
5447 Set_Protected_Body_Subprogram (
5448 Defining_Identifier (Comp),
5449 Defining_Unit_Name (Specification (Sub)));
5451 Current_Node := Sub;
5454 Make_Defining_Identifier (Loc,
5457 New_External_Name (Chars (Comp_Id), Suffix_Index => -1),
5460 Make_Subprogram_Declaration (Loc,
5462 Build_Barrier_Function_Specification (Bdef, Loc));
5464 Insert_After (Current_Node, Sub);
5466 Set_Protected_Body_Subprogram (Bdef, Bdef);
5467 Set_Barrier_Function (Comp_Id, Bdef);
5468 Set_Scope (Bdef, Scope (Comp_Id));
5469 Current_Node := Sub;
5471 -- Collect pointers to the protected subprogram and the barrier
5472 -- of the current entry, for insertion into Entry_Bodies_Array.
5475 Make_Aggregate (Loc,
5476 Expressions => New_List (
5477 Make_Attribute_Reference (Loc,
5478 Prefix => New_Reference_To (Bdef, Loc),
5479 Attribute_Name => Name_Unrestricted_Access),
5480 Make_Attribute_Reference (Loc,
5481 Prefix => New_Reference_To (Edef, Loc),
5482 Attribute_Name => Name_Unrestricted_Access))),
5483 Expressions (Entries_Aggr));
5490 -- If there are some private entry declarations, expand it as if they
5491 -- were visible entries.
5493 if Present (Private_Declarations (Pdef)) then
5494 Comp := First (Private_Declarations (Pdef));
5496 while Present (Comp) loop
5497 if Nkind (Comp) = N_Entry_Declaration then
5498 E_Count := E_Count + 1;
5499 Comp_Id := Defining_Identifier (Comp);
5500 Set_Privals_Chain (Comp_Id, New_Elmt_List);
5502 Make_Defining_Identifier (Loc,
5505 New_External_Name (Chars (Comp_Id), Suffix_Index => -1),
5509 Make_Subprogram_Declaration (Loc,
5511 Build_Protected_Entry_Specification (Edef, Comp_Id, Loc));
5513 Insert_After (Current_Node, Sub);
5516 Set_Protected_Body_Subprogram (
5517 Defining_Identifier (Comp),
5518 Defining_Unit_Name (Specification (Sub)));
5520 Current_Node := Sub;
5523 Make_Defining_Identifier (Loc,
5526 New_External_Name (Chars (Comp_Id), Suffix_Index => -1),
5529 Make_Subprogram_Declaration (Loc,
5531 Build_Barrier_Function_Specification (Bdef, Loc));
5533 Insert_After (Current_Node, Sub);
5535 Set_Protected_Body_Subprogram (Bdef, Bdef);
5536 Set_Barrier_Function (Comp_Id, Bdef);
5537 Set_Scope (Bdef, Scope (Comp_Id));
5538 Current_Node := Sub;
5540 -- Collect pointers to the protected subprogram and the
5541 -- barrier of the current entry, for insertion into
5542 -- Entry_Bodies_Array.
5545 Make_Aggregate (Loc,
5546 Expressions => New_List (
5547 Make_Attribute_Reference (Loc,
5548 Prefix => New_Reference_To (Bdef, Loc),
5549 Attribute_Name => Name_Unrestricted_Access),
5550 Make_Attribute_Reference (Loc,
5551 Prefix => New_Reference_To (Edef, Loc),
5552 Attribute_Name => Name_Unrestricted_Access))),
5553 Expressions (Entries_Aggr));
5560 -- Emit declaration for Entry_Bodies_Array, now that the addresses of
5561 -- all protected subprograms have been collected.
5563 if Has_Entries (Prottyp) then
5564 Body_Id := Make_Defining_Identifier (Sloc (Prottyp),
5565 New_External_Name (Chars (Prottyp), 'A'));
5568 or else Restriction_Active (No_Entry_Queue) = False
5571 Body_Arr := Make_Object_Declaration (Loc,
5572 Defining_Identifier => Body_Id,
5573 Aliased_Present => True,
5574 Object_Definition =>
5575 Make_Subtype_Indication (Loc,
5576 Subtype_Mark => New_Reference_To (
5577 RTE (RE_Protected_Entry_Body_Array), Loc),
5579 Make_Index_Or_Discriminant_Constraint (Loc,
5580 Constraints => New_List (
5582 Make_Integer_Literal (Loc, 1),
5583 Make_Integer_Literal (Loc, E_Count))))),
5584 Expression => Entries_Aggr);
5587 Body_Arr := Make_Object_Declaration (Loc,
5588 Defining_Identifier => Body_Id,
5589 Aliased_Present => True,
5590 Object_Definition => New_Reference_To (RTE (RE_Entry_Body), Loc),
5592 Make_Aggregate (Loc,
5593 Expressions => New_List (
5594 Make_Attribute_Reference (Loc,
5595 Prefix => New_Reference_To (Bdef, Loc),
5596 Attribute_Name => Name_Unrestricted_Access),
5597 Make_Attribute_Reference (Loc,
5598 Prefix => New_Reference_To (Edef, Loc),
5599 Attribute_Name => Name_Unrestricted_Access))));
5602 -- A pointer to this array will be placed in the corresponding
5603 -- record by its initialization procedure, so this needs to be
5606 Insert_After (Current_Node, Body_Arr);
5607 Current_Node := Body_Arr;
5610 Set_Entry_Bodies_Array (Prottyp, Body_Id);
5612 -- Finally, build the function that maps an entry index into the
5613 -- corresponding body. A pointer to this function is placed in each
5614 -- object of the type. Except for a ravenscar-like profile (no abort,
5615 -- no entry queue, 1 entry)
5618 or else Restriction_Active (No_Entry_Queue) = False
5622 Make_Subprogram_Declaration (Loc,
5623 Specification => Build_Find_Body_Index_Spec (Prottyp));
5624 Insert_After (Current_Node, Sub);
5628 end Expand_N_Protected_Type_Declaration;
5630 --------------------------------
5631 -- Expand_N_Requeue_Statement --
5632 --------------------------------
5634 -- A requeue statement is expanded into one of four GNARLI operations,
5635 -- depending on the source and destination (task or protected object).
5636 -- In addition, code must be generated to jump around the remainder of
5637 -- processing for the original entry and, if the destination is a
5638 -- (different) protected object, to attempt to service it.
5639 -- The following illustrates the various cases:
5642 -- (O : System.Address;
5643 -- P : System.Address;
5644 -- E : Protected_Entry_Index)
5646 -- <discriminant renamings>
5647 -- <private object renamings>
5648 -- type poVP is access poV;
5649 -- _Object : ptVP := ptVP!(O);
5653 -- <start of statement sequence for entry>
5655 -- -- Requeue from one protected entry body to another protected
5658 -- Requeue_Protected_Entry (
5659 -- _object._object'Access,
5660 -- new._object'Access,
5665 -- <some more of the statement sequence for entry>
5667 -- -- Requeue from an entry body to a task entry.
5669 -- Requeue_Protected_To_Task_Entry (
5675 -- <rest of statement sequence for entry>
5676 -- Complete_Entry_Body (_Object._Object);
5679 -- when all others =>
5680 -- Exceptional_Complete_Entry_Body (
5681 -- _Object._Object, Get_GNAT_Exception);
5685 -- Requeue of a task entry call to a task entry.
5687 -- Accept_Call (E, Ann);
5688 -- <start of statement sequence for accept statement>
5689 -- Requeue_Task_Entry (New._task_id, E, Abort_Present);
5691 -- <rest of statement sequence for accept statement>
5693 -- Complete_Rendezvous;
5696 -- when all others =>
5697 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
5699 -- Requeue of a task entry call to a protected entry.
5701 -- Accept_Call (E, Ann);
5702 -- <start of statement sequence for accept statement>
5703 -- Requeue_Task_To_Protected_Entry (
5704 -- new._object'Access,
5709 -- <rest of statement sequence for accept statement>
5711 -- Complete_Rendezvous;
5714 -- when all others =>
5715 -- Exceptional_Complete_Rendezvous (Get_GNAT_Exception);
5717 -- Further details on these expansions can be found in
5718 -- Expand_N_Protected_Body and Expand_N_Accept_Statement.
5720 procedure Expand_N_Requeue_Statement (N : Node_Id) is
5721 Loc : constant Source_Ptr := Sloc (N);
5726 Conctyp : Entity_Id;
5730 Abortable : Node_Id;
5731 Skip_Stat : Node_Id;
5732 Self_Param : Node_Id;
5733 New_Param : Node_Id;
5735 RTS_Call : Entity_Id;
5738 if Abort_Present (N) then
5739 Abortable := New_Occurrence_Of (Standard_True, Loc);
5741 Abortable := New_Occurrence_Of (Standard_False, Loc);
5744 -- Set up the target object.
5746 Extract_Entry (N, Concval, Ename, Index);
5747 Conctyp := Etype (Concval);
5748 New_Param := Concurrent_Ref (Concval);
5750 -- The target entry index and abortable flag are the same for all cases.
5752 Params := New_List (
5753 Entry_Index_Expression (Loc, Entity (Ename), Index, Conctyp),
5756 -- Determine proper GNARLI call and required additional parameters
5757 -- Loop to find nearest enclosing task type or protected type
5759 Oldtyp := Current_Scope;
5761 if Is_Task_Type (Oldtyp) then
5762 if Is_Task_Type (Conctyp) then
5763 RTS_Call := RTE (RE_Requeue_Task_Entry);
5766 pragma Assert (Is_Protected_Type (Conctyp));
5767 RTS_Call := RTE (RE_Requeue_Task_To_Protected_Entry);
5769 Make_Attribute_Reference (Loc,
5770 Prefix => New_Param,
5771 Attribute_Name => Name_Unchecked_Access);
5774 Prepend (New_Param, Params);
5777 elsif Is_Protected_Type (Oldtyp) then
5779 Make_Attribute_Reference (Loc,
5780 Prefix => Concurrent_Ref (New_Occurrence_Of (Oldtyp, Loc)),
5781 Attribute_Name => Name_Unchecked_Access);
5783 if Is_Task_Type (Conctyp) then
5784 RTS_Call := RTE (RE_Requeue_Protected_To_Task_Entry);
5787 pragma Assert (Is_Protected_Type (Conctyp));
5788 RTS_Call := RTE (RE_Requeue_Protected_Entry);
5790 Make_Attribute_Reference (Loc,
5791 Prefix => New_Param,
5792 Attribute_Name => Name_Unchecked_Access);
5795 Prepend (New_Param, Params);
5796 Prepend (Self_Param, Params);
5799 -- If neither task type or protected type, must be in some
5800 -- inner enclosing block, so move on out
5803 Oldtyp := Scope (Oldtyp);
5807 -- Create the GNARLI call.
5809 Rcall := Make_Procedure_Call_Statement (Loc,
5811 New_Occurrence_Of (RTS_Call, Loc),
5812 Parameter_Associations => Params);
5817 if Is_Protected_Type (Oldtyp) then
5819 -- Build the return statement to skip the rest of the entry body
5821 Skip_Stat := Make_Return_Statement (Loc);
5824 -- If the requeue is within a task, find the end label of the
5825 -- enclosing accept statement.
5827 Acc_Stat := Parent (N);
5828 while Nkind (Acc_Stat) /= N_Accept_Statement loop
5829 Acc_Stat := Parent (Acc_Stat);
5832 -- The last statement is the second label, used for completing the
5833 -- rendezvous the usual way.
5834 -- The label we are looking for is right before it.
5837 Prev (Last (Statements (Handled_Statement_Sequence (Acc_Stat))));
5839 pragma Assert (Nkind (Lab_Node) = N_Label);
5841 -- Build the goto statement to skip the rest of the accept
5845 Make_Goto_Statement (Loc,
5846 Name => New_Occurrence_Of (Entity (Identifier (Lab_Node)), Loc));
5849 Set_Analyzed (Skip_Stat);
5851 Insert_After (N, Skip_Stat);
5852 end Expand_N_Requeue_Statement;
5854 -------------------------------
5855 -- Expand_N_Selective_Accept --
5856 -------------------------------
5858 procedure Expand_N_Selective_Accept (N : Node_Id) is
5859 Loc : constant Source_Ptr := Sloc (N);
5860 Alts : constant List_Id := Select_Alternatives (N);
5862 -- Note: in the below declarations a lot of new lists are allocated
5863 -- unconditionally which may well not end up being used. That's
5864 -- not a good idea since it wastes space gratuitously ???
5866 Accept_Case : List_Id;
5867 Accept_List : constant List_Id := New_List;
5870 Alt_List : constant List_Id := New_List;
5871 Alt_Stats : List_Id;
5872 Ann : Entity_Id := Empty;
5875 Check_Guard : Boolean := True;
5877 Decls : constant List_Id := New_List;
5878 Stats : constant List_Id := New_List;
5879 Body_List : constant List_Id := New_List;
5880 Trailing_List : constant List_Id := New_List;
5883 Else_Present : Boolean := False;
5884 Terminate_Alt : Node_Id := Empty;
5885 Select_Mode : Node_Id;
5887 Delay_Case : List_Id;
5888 Delay_Count : Integer := 0;
5889 Delay_Val : Entity_Id;
5890 Delay_Index : Entity_Id;
5891 Delay_Min : Entity_Id;
5892 Delay_Num : Int := 1;
5893 Delay_Alt_List : List_Id := New_List;
5894 Delay_List : constant List_Id := New_List;
5898 First_Delay : Boolean := True;
5899 Guard_Open : Entity_Id;
5905 Num_Accept : Nat := 0;
5908 Time_Type : Entity_Id;
5910 Select_Call : Node_Id;
5912 Qnam : constant Entity_Id :=
5913 Make_Defining_Identifier (Loc, New_External_Name ('S', 0));
5915 Xnam : constant Entity_Id :=
5916 Make_Defining_Identifier (Loc, New_External_Name ('J', 1));
5918 -----------------------
5919 -- Local subprograms --
5920 -----------------------
5922 function Accept_Or_Raise return List_Id;
5923 -- For the rare case where delay alternatives all have guards, and
5924 -- all of them are closed, it is still possible that there were open
5925 -- accept alternatives with no callers. We must reexamine the
5926 -- Accept_List, and execute a selective wait with no else if some
5927 -- accept is open. If none, we raise program_error.
5929 procedure Add_Accept (Alt : Node_Id);
5930 -- Process a single accept statement in a select alternative. Build
5931 -- procedure for body of accept, and add entry to dispatch table with
5932 -- expression for guard, in preparation for call to run time select.
5934 function Make_And_Declare_Label (Num : Int) return Node_Id;
5935 -- Manufacture a label using Num as a serial number and declare it.
5936 -- The declaration is appended to Decls. The label marks the trailing
5937 -- statements of an accept or delay alternative.
5939 function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id;
5940 -- Build call to Selective_Wait runtime routine.
5942 procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int);
5943 -- Add code to compare value of delay with previous values, and
5944 -- generate case entry for trailing statements.
5946 procedure Process_Accept_Alternative
5950 -- Add code to call corresponding procedure, and branch to
5951 -- trailing statements, if any.
5953 ---------------------
5954 -- Accept_Or_Raise --
5955 ---------------------
5957 function Accept_Or_Raise return List_Id is
5960 J : constant Entity_Id := Make_Defining_Identifier (Loc,
5961 New_Internal_Name ('J'));
5964 -- We generate the following:
5966 -- for J in q'range loop
5967 -- if q(J).S /=null_task_entry then
5968 -- selective_wait (simple_mode,...);
5974 -- if no rendez_vous then
5975 -- raise program_error;
5978 -- Note that the code needs to know that the selector name
5979 -- in an Accept_Alternative is named S.
5981 Cond := Make_Op_Ne (Loc,
5983 Make_Selected_Component (Loc,
5984 Prefix => Make_Indexed_Component (Loc,
5985 Prefix => New_Reference_To (Qnam, Loc),
5986 Expressions => New_List (New_Reference_To (J, Loc))),
5987 Selector_Name => Make_Identifier (Loc, Name_S)),
5989 New_Reference_To (RTE (RE_Null_Task_Entry), Loc));
5992 Make_Implicit_Loop_Statement (N,
5993 Identifier => Empty,
5995 Make_Iteration_Scheme (Loc,
5996 Loop_Parameter_Specification =>
5997 Make_Loop_Parameter_Specification (Loc,
5998 Defining_Identifier => J,
5999 Discrete_Subtype_Definition =>
6000 Make_Attribute_Reference (Loc,
6001 Prefix => New_Reference_To (Qnam, Loc),
6002 Attribute_Name => Name_Range,
6003 Expressions => New_List (
6004 Make_Integer_Literal (Loc, 1))))),
6006 Statements => New_List (
6007 Make_Implicit_If_Statement (N,
6009 Then_Statements => New_List (
6011 New_Reference_To (RTE (RE_Simple_Mode), Loc)),
6012 Make_Exit_Statement (Loc))))));
6015 Make_Raise_Program_Error (Loc,
6016 Condition => Make_Op_Eq (Loc,
6017 Left_Opnd => New_Reference_To (Xnam, Loc),
6019 New_Reference_To (RTE (RE_No_Rendezvous), Loc)),
6020 Reason => PE_All_Guards_Closed));
6023 end Accept_Or_Raise;
6029 procedure Add_Accept (Alt : Node_Id) is
6030 Acc_Stm : constant Node_Id := Accept_Statement (Alt);
6031 Ename : constant Node_Id := Entry_Direct_Name (Acc_Stm);
6032 Eent : constant Entity_Id := Entity (Ename);
6033 Index : constant Node_Id := Entry_Index (Acc_Stm);
6034 Null_Body : Node_Id;
6035 Proc_Body : Node_Id;
6042 Ann := Node (Last_Elmt (Accept_Address (Eent)));
6045 if Present (Condition (Alt)) then
6047 Make_Conditional_Expression (Loc, New_List (
6049 Entry_Index_Expression (Loc, Eent, Index, Scope (Eent)),
6050 New_Reference_To (RTE (RE_Null_Task_Entry), Loc)));
6053 Entry_Index_Expression
6054 (Loc, Eent, Index, Scope (Eent));
6057 if Present (Handled_Statement_Sequence (Accept_Statement (Alt))) then
6058 Null_Body := New_Reference_To (Standard_False, Loc);
6060 if Abort_Allowed then
6061 Call := Make_Procedure_Call_Statement (Loc,
6062 Name => New_Reference_To (RTE (RE_Abort_Undefer), Loc));
6063 Insert_Before (First (Statements (Handled_Statement_Sequence (
6064 Accept_Statement (Alt)))), Call);
6069 Make_Defining_Identifier (Sloc (Ename),
6070 New_External_Name (Chars (Ename), 'A', Num_Accept));
6072 Set_Needs_Debug_Info (PB_Ent, Comes_From_Source (Alt));
6075 Make_Subprogram_Body (Loc,
6077 Make_Procedure_Specification (Loc,
6078 Defining_Unit_Name => PB_Ent),
6079 Declarations => Declarations (Acc_Stm),
6080 Handled_Statement_Sequence =>
6081 Build_Accept_Body (Accept_Statement (Alt)));
6083 -- During the analysis of the body of the accept statement, any
6084 -- zero cost exception handler records were collected in the
6085 -- Accept_Handler_Records field of the N_Accept_Alternative
6086 -- node. This is where we move them to where they belong,
6087 -- namely the newly created procedure.
6089 Set_Handler_Records (PB_Ent, Accept_Handler_Records (Alt));
6090 Append (Proc_Body, Body_List);
6093 Null_Body := New_Reference_To (Standard_True, Loc);
6095 -- if accept statement has declarations, insert above, given
6096 -- that we are not creating a body for the accept.
6098 if Present (Declarations (Acc_Stm)) then
6099 Insert_Actions (N, Declarations (Acc_Stm));
6103 Append_To (Accept_List,
6104 Make_Aggregate (Loc, Expressions => New_List (Null_Body, Expr)));
6106 Num_Accept := Num_Accept + 1;
6109 ----------------------------
6110 -- Make_And_Declare_Label --
6111 ----------------------------
6113 function Make_And_Declare_Label (Num : Int) return Node_Id is
6117 Lab_Id := Make_Identifier (Loc, New_External_Name ('L', Num));
6119 Make_Label (Loc, Lab_Id);
6122 Make_Implicit_Label_Declaration (Loc,
6123 Defining_Identifier =>
6124 Make_Defining_Identifier (Loc, Chars (Lab_Id)),
6125 Label_Construct => Lab));
6128 end Make_And_Declare_Label;
6130 ----------------------
6131 -- Make_Select_Call --
6132 ----------------------
6134 function Make_Select_Call (Select_Mode : Entity_Id) return Node_Id is
6135 Params : constant List_Id := New_List;
6139 Make_Attribute_Reference (Loc,
6140 Prefix => New_Reference_To (Qnam, Loc),
6141 Attribute_Name => Name_Unchecked_Access),
6143 Append (Select_Mode, Params);
6144 Append (New_Reference_To (Ann, Loc), Params);
6145 Append (New_Reference_To (Xnam, Loc), Params);
6148 Make_Procedure_Call_Statement (Loc,
6149 Name => New_Reference_To (RTE (RE_Selective_Wait), Loc),
6150 Parameter_Associations => Params);
6151 end Make_Select_Call;
6153 --------------------------------
6154 -- Process_Accept_Alternative --
6155 --------------------------------
6157 procedure Process_Accept_Alternative
6162 Choices : List_Id := No_List;
6163 Alt_Stats : List_Id;
6166 Adjust_Condition (Condition (Alt));
6167 Alt_Stats := No_List;
6169 if Present (Handled_Statement_Sequence (Accept_Statement (Alt))) then
6170 Choices := New_List (
6171 Make_Integer_Literal (Loc, Index));
6173 Alt_Stats := New_List (
6174 Make_Procedure_Call_Statement (Loc,
6175 Name => New_Reference_To (
6176 Defining_Unit_Name (Specification (Proc)), Loc)));
6179 if Statements (Alt) /= Empty_List then
6181 if No (Alt_Stats) then
6183 -- Accept with no body, followed by trailing statements.
6185 Choices := New_List (
6186 Make_Integer_Literal (Loc, Index));
6188 Alt_Stats := New_List;
6191 -- After the call, if any, branch to to trailing statements.
6192 -- We create a label for each, as well as the corresponding
6193 -- label declaration.
6195 Lab := Make_And_Declare_Label (Index);
6196 Append_To (Alt_Stats,
6197 Make_Goto_Statement (Loc,
6198 Name => New_Copy (Identifier (Lab))));
6200 Append (Lab, Trailing_List);
6201 Append_List (Statements (Alt), Trailing_List);
6202 Append_To (Trailing_List,
6203 Make_Goto_Statement (Loc,
6204 Name => New_Copy (Identifier (End_Lab))));
6207 if Present (Alt_Stats) then
6209 -- Procedure call. and/or trailing statements
6211 Append_To (Alt_List,
6212 Make_Case_Statement_Alternative (Loc,
6213 Discrete_Choices => Choices,
6214 Statements => Alt_Stats));
6216 end Process_Accept_Alternative;
6218 -------------------------------
6219 -- Process_Delay_Alternative --
6220 -------------------------------
6222 procedure Process_Delay_Alternative (Alt : Node_Id; Index : Int) is
6225 Delay_Alt : List_Id;
6228 -- Deal with C/Fortran boolean as delay condition
6230 Adjust_Condition (Condition (Alt));
6232 -- Determine the smallest specified delay.
6233 -- for each delay alternative generate:
6235 -- if guard-expression then
6236 -- Delay_Val := delay-expression;
6237 -- Guard_Open := True;
6238 -- if Delay_Val < Delay_Min then
6239 -- Delay_Min := Delay_Val;
6240 -- Delay_Index := Index;
6244 -- The enclosing if-statement is omitted if there is no guard.
6249 First_Delay := False;
6251 Delay_Alt := New_List (
6252 Make_Assignment_Statement (Loc,
6253 Name => New_Reference_To (Delay_Min, Loc),
6254 Expression => Expression (Delay_Statement (Alt))));
6256 if Delay_Count > 1 then
6257 Append_To (Delay_Alt,
6258 Make_Assignment_Statement (Loc,
6259 Name => New_Reference_To (Delay_Index, Loc),
6260 Expression => Make_Integer_Literal (Loc, Index)));
6264 Delay_Alt := New_List (
6265 Make_Assignment_Statement (Loc,
6266 Name => New_Reference_To (Delay_Val, Loc),
6267 Expression => Expression (Delay_Statement (Alt))));
6269 if Time_Type = Standard_Duration then
6272 Left_Opnd => New_Reference_To (Delay_Val, Loc),
6273 Right_Opnd => New_Reference_To (Delay_Min, Loc));
6276 -- The scope of the time type must define a comparison
6277 -- operator. The scope itself may not be visible, so we
6278 -- construct a node with entity information to insure that
6279 -- semantic analysis can find the proper operator.
6282 Make_Function_Call (Loc,
6283 Name => Make_Selected_Component (Loc,
6284 Prefix => New_Reference_To (Scope (Time_Type), Loc),
6286 Make_Operator_Symbol (Loc,
6287 Chars => Name_Op_Lt,
6288 Strval => No_String)),
6289 Parameter_Associations =>
6291 New_Reference_To (Delay_Val, Loc),
6292 New_Reference_To (Delay_Min, Loc)));
6294 Set_Entity (Prefix (Name (Cond)), Scope (Time_Type));
6297 Append_To (Delay_Alt,
6298 Make_Implicit_If_Statement (N,
6300 Then_Statements => New_List (
6301 Make_Assignment_Statement (Loc,
6302 Name => New_Reference_To (Delay_Min, Loc),
6303 Expression => New_Reference_To (Delay_Val, Loc)),
6305 Make_Assignment_Statement (Loc,
6306 Name => New_Reference_To (Delay_Index, Loc),
6307 Expression => Make_Integer_Literal (Loc, Index)))));
6311 Append_To (Delay_Alt,
6312 Make_Assignment_Statement (Loc,
6313 Name => New_Reference_To (Guard_Open, Loc),
6314 Expression => New_Reference_To (Standard_True, Loc)));
6317 if Present (Condition (Alt)) then
6318 Delay_Alt := New_List (
6319 Make_Implicit_If_Statement (N,
6320 Condition => Condition (Alt),
6321 Then_Statements => Delay_Alt));
6324 Append_List (Delay_Alt, Delay_List);
6326 -- If the delay alternative has a statement part, add a
6327 -- choice to the case statements for delays.
6329 if Present (Statements (Alt)) then
6331 if Delay_Count = 1 then
6332 Append_List (Statements (Alt), Delay_Alt_List);
6335 Choices := New_List (
6336 Make_Integer_Literal (Loc, Index));
6338 Append_To (Delay_Alt_List,
6339 Make_Case_Statement_Alternative (Loc,
6340 Discrete_Choices => Choices,
6341 Statements => Statements (Alt)));
6344 elsif Delay_Count = 1 then
6346 -- If the single delay has no trailing statements, add a branch
6347 -- to the exit label to the selective wait.
6349 Delay_Alt_List := New_List (
6350 Make_Goto_Statement (Loc,
6351 Name => New_Copy (Identifier (End_Lab))));
6354 end Process_Delay_Alternative;
6356 -- Start of processing for Expand_N_Selective_Accept
6359 -- First insert some declarations before the select. The first is:
6363 -- This variable holds the parameters passed to the accept body. This
6364 -- declaration has already been inserted by the time we get here by
6365 -- a call to Expand_Accept_Declarations made from the semantics when
6366 -- processing the first accept statement contained in the select. We
6367 -- can find this entity as Accept_Address (E), where E is any of the
6368 -- entries references by contained accept statements.
6370 -- The first step is to scan the list of Selective_Accept_Statements
6371 -- to find this entity, and also count the number of accepts, and
6372 -- determine if terminated, delay or else is present:
6376 Alt := First (Alts);
6377 while Present (Alt) loop
6379 if Nkind (Alt) = N_Accept_Alternative then
6382 elsif Nkind (Alt) = N_Delay_Alternative then
6383 Delay_Count := Delay_Count + 1;
6385 -- If the delays are relative delays, the delay expressions have
6386 -- type Standard_Duration. Otherwise they must have some time type
6387 -- recognized by GNAT.
6389 if Nkind (Delay_Statement (Alt)) = N_Delay_Relative_Statement then
6390 Time_Type := Standard_Duration;
6392 Time_Type := Etype (Expression (Delay_Statement (Alt)));
6394 if Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time)
6395 or else Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time)
6400 "& is not a time type ('R'M 9.6(6))",
6401 Expression (Delay_Statement (Alt)), Time_Type);
6402 Time_Type := Standard_Duration;
6403 Set_Etype (Expression (Delay_Statement (Alt)), Any_Type);
6407 if No (Condition (Alt)) then
6409 -- This guard will always be open.
6411 Check_Guard := False;
6414 elsif Nkind (Alt) = N_Terminate_Alternative then
6415 Adjust_Condition (Condition (Alt));
6416 Terminate_Alt := Alt;
6419 Num_Alts := Num_Alts + 1;
6423 Else_Present := Present (Else_Statements (N));
6425 -- At the same time (see procedure Add_Accept) we build the accept list:
6427 -- Qnn : Accept_List (1 .. num-select) := (
6428 -- (null-body, entry-index),
6429 -- (null-body, entry-index),
6431 -- (null_body, entry-index));
6433 -- In the above declaration, null-body is True if the corresponding
6434 -- accept has no body, and false otherwise. The entry is either the
6435 -- entry index expression if there is no guard, or if a guard is
6436 -- present, then a conditional expression of the form:
6438 -- (if guard then entry-index else Null_Task_Entry)
6440 -- If a guard is statically known to be false, the entry can simply
6441 -- be omitted from the accept list.
6444 Make_Object_Declaration (Loc,
6445 Defining_Identifier => Qnam,
6446 Object_Definition =>
6447 New_Reference_To (RTE (RE_Accept_List), Loc),
6448 Aliased_Present => True,
6451 Make_Qualified_Expression (Loc,
6453 New_Reference_To (RTE (RE_Accept_List), Loc),
6455 Make_Aggregate (Loc, Expressions => Accept_List)));
6459 -- Then we declare the variable that holds the index for the accept
6460 -- that will be selected for service:
6462 -- Xnn : Select_Index;
6465 Make_Object_Declaration (Loc,
6466 Defining_Identifier => Xnam,
6467 Object_Definition =>
6468 New_Reference_To (RTE (RE_Select_Index), Loc),
6470 New_Reference_To (RTE (RE_No_Rendezvous), Loc));
6474 -- After this follow procedure declarations for each accept body.
6481 -- where the ... are statements from the corresponding procedure body.
6482 -- No parameters are involved, since the parameters are passed via Ann
6483 -- and the parameter references have already been expanded to be direct
6484 -- references to Ann (see Exp_Ch2.Expand_Entry_Parameter). Furthermore,
6485 -- any embedded tasking statements (which would normally be illegal in
6486 -- procedures, have been converted to calls to the tasking runtime so
6487 -- there is no problem in putting them into procedures.
6489 -- The original accept statement has been expanded into a block in
6490 -- the same fashion as for simple accepts (see Build_Accept_Body).
6492 -- Note: we don't really need to build these procedures for the case
6493 -- where no delay statement is present, but it is just as easy to
6494 -- build them unconditionally, and not significantly inefficient,
6495 -- since if they are short they will be inlined anyway.
6497 -- The procedure declarations have been assembled in Body_List.
6499 -- If delays are present, we must compute the required delay.
6500 -- We first generate the declarations:
6502 -- Delay_Index : Boolean := 0;
6503 -- Delay_Min : Some_Time_Type.Time;
6504 -- Delay_Val : Some_Time_Type.Time;
6506 -- Delay_Index will be set to the index of the minimum delay, i.e. the
6507 -- active delay that is actually chosen as the basis for the possible
6508 -- delay if an immediate rendez-vous is not possible.
6509 -- In the most common case there is a single delay statement, and this
6510 -- is handled specially.
6512 if Delay_Count > 0 then
6514 -- Generate the required declarations
6517 Make_Defining_Identifier (Loc, New_External_Name ('D', 1));
6519 Make_Defining_Identifier (Loc, New_External_Name ('D', 2));
6521 Make_Defining_Identifier (Loc, New_External_Name ('D', 3));
6524 Make_Object_Declaration (Loc,
6525 Defining_Identifier => Delay_Val,
6526 Object_Definition => New_Reference_To (Time_Type, Loc)));
6529 Make_Object_Declaration (Loc,
6530 Defining_Identifier => Delay_Index,
6531 Object_Definition => New_Reference_To (Standard_Integer, Loc),
6532 Expression => Make_Integer_Literal (Loc, 0)));
6535 Make_Object_Declaration (Loc,
6536 Defining_Identifier => Delay_Min,
6537 Object_Definition => New_Reference_To (Time_Type, Loc),
6539 Unchecked_Convert_To (Time_Type,
6540 Make_Attribute_Reference (Loc,
6542 New_Occurrence_Of (Underlying_Type (Time_Type), Loc),
6543 Attribute_Name => Name_Last))));
6545 -- Create Duration and Delay_Mode objects used for passing a delay
6548 D := Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
6549 M := Make_Defining_Identifier (Loc, New_Internal_Name ('M'));
6555 -- Note that these values are defined in s-osprim.ads and must
6558 -- Relative : constant := 0;
6559 -- Absolute_Calendar : constant := 1;
6560 -- Absolute_RT : constant := 2;
6562 if Time_Type = Standard_Duration then
6563 Discr := Make_Integer_Literal (Loc, 0);
6565 elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
6566 Discr := Make_Integer_Literal (Loc, 1);
6570 (Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
6571 Discr := Make_Integer_Literal (Loc, 2);
6575 Make_Object_Declaration (Loc,
6576 Defining_Identifier => D,
6577 Object_Definition =>
6578 New_Reference_To (Standard_Duration, Loc)));
6581 Make_Object_Declaration (Loc,
6582 Defining_Identifier => M,
6583 Object_Definition =>
6584 New_Reference_To (Standard_Integer, Loc),
6585 Expression => Discr));
6590 Make_Defining_Identifier (Loc, New_External_Name ('G', 1));
6593 Make_Object_Declaration (Loc,
6594 Defining_Identifier => Guard_Open,
6595 Object_Definition => New_Reference_To (Standard_Boolean, Loc),
6596 Expression => New_Reference_To (Standard_False, Loc)));
6599 -- Delay_Count is zero, don't need M and D set (suppress warning)
6606 if Present (Terminate_Alt) then
6608 -- If the terminate alternative guard is False, use
6609 -- Simple_Mode; otherwise use Terminate_Mode.
6611 if Present (Condition (Terminate_Alt)) then
6612 Select_Mode := Make_Conditional_Expression (Loc,
6613 New_List (Condition (Terminate_Alt),
6614 New_Reference_To (RTE (RE_Terminate_Mode), Loc),
6615 New_Reference_To (RTE (RE_Simple_Mode), Loc)));
6617 Select_Mode := New_Reference_To (RTE (RE_Terminate_Mode), Loc);
6620 elsif Else_Present or Delay_Count > 0 then
6621 Select_Mode := New_Reference_To (RTE (RE_Else_Mode), Loc);
6624 Select_Mode := New_Reference_To (RTE (RE_Simple_Mode), Loc);
6627 Select_Call := Make_Select_Call (Select_Mode);
6628 Append (Select_Call, Stats);
6630 -- Now generate code to act on the result. There is an entry
6631 -- in this case for each accept statement with a non-null body,
6632 -- followed by a branch to the statements that follow the Accept.
6633 -- In the absence of delay alternatives, we generate:
6636 -- when No_Rendezvous => -- omitted if simple mode
6651 -- Lab0: Else_Statements;
6654 -- Lab1: Trailing_Statements1;
6657 -- Lab2: Trailing_Statements2;
6662 -- Generate label for common exit.
6664 End_Lab := Make_And_Declare_Label (Num_Alts + 1);
6666 -- First entry is the default case, when no rendezvous is possible.
6668 Choices := New_List (New_Reference_To (RTE (RE_No_Rendezvous), Loc));
6670 if Else_Present then
6672 -- If no rendezvous is possible, the else part is executed.
6674 Lab := Make_And_Declare_Label (0);
6675 Alt_Stats := New_List (
6676 Make_Goto_Statement (Loc,
6677 Name => New_Copy (Identifier (Lab))));
6679 Append (Lab, Trailing_List);
6680 Append_List (Else_Statements (N), Trailing_List);
6681 Append_To (Trailing_List,
6682 Make_Goto_Statement (Loc,
6683 Name => New_Copy (Identifier (End_Lab))));
6685 Alt_Stats := New_List (
6686 Make_Goto_Statement (Loc,
6687 Name => New_Copy (Identifier (End_Lab))));
6690 Append_To (Alt_List,
6691 Make_Case_Statement_Alternative (Loc,
6692 Discrete_Choices => Choices,
6693 Statements => Alt_Stats));
6695 -- We make use of the fact that Accept_Index is an integer type,
6696 -- and generate successive literals for entries for each accept.
6697 -- Only those for which there is a body or trailing statements are
6698 -- given a case entry.
6700 Alt := First (Select_Alternatives (N));
6701 Proc := First (Body_List);
6703 while Present (Alt) loop
6705 if Nkind (Alt) = N_Accept_Alternative then
6706 Process_Accept_Alternative (Alt, Index, Proc);
6710 (Handled_Statement_Sequence (Accept_Statement (Alt)))
6715 elsif Nkind (Alt) = N_Delay_Alternative then
6716 Process_Delay_Alternative (Alt, Delay_Num);
6717 Delay_Num := Delay_Num + 1;
6723 -- An others choice is always added to the main case, as well
6724 -- as the delay case (to satisfy the compiler).
6726 Append_To (Alt_List,
6727 Make_Case_Statement_Alternative (Loc,
6729 New_List (Make_Others_Choice (Loc)),
6731 New_List (Make_Goto_Statement (Loc,
6732 Name => New_Copy (Identifier (End_Lab))))));
6734 Accept_Case := New_List (
6735 Make_Case_Statement (Loc,
6736 Expression => New_Reference_To (Xnam, Loc),
6737 Alternatives => Alt_List));
6739 Append_List (Trailing_List, Accept_Case);
6740 Append (End_Lab, Accept_Case);
6741 Append_List (Body_List, Decls);
6743 -- Construct case statement for trailing statements of delay
6744 -- alternatives, if there are several of them.
6746 if Delay_Count > 1 then
6747 Append_To (Delay_Alt_List,
6748 Make_Case_Statement_Alternative (Loc,
6750 New_List (Make_Others_Choice (Loc)),
6752 New_List (Make_Null_Statement (Loc))));
6754 Delay_Case := New_List (
6755 Make_Case_Statement (Loc,
6756 Expression => New_Reference_To (Delay_Index, Loc),
6757 Alternatives => Delay_Alt_List));
6759 Delay_Case := Delay_Alt_List;
6762 -- If there are no delay alternatives, we append the case statement
6763 -- to the statement list.
6765 if Delay_Count = 0 then
6766 Append_List (Accept_Case, Stats);
6768 -- Delay alternatives present
6771 -- If delay alternatives are present we generate:
6773 -- find minimum delay.
6774 -- DX := minimum delay;
6775 -- M := <delay mode>;
6776 -- Timed_Selective_Wait (Q'Unchecked_Access, Delay_Mode, P,
6779 -- if X = No_Rendezvous then
6780 -- case statement for delay statements.
6782 -- case statement for accept alternatives.
6793 -- The type of the delay expression is known to be legal
6795 if Time_Type = Standard_Duration then
6796 Conv := New_Reference_To (Delay_Min, Loc);
6798 elsif Is_RTE (Base_Type (Etype (Time_Type)), RO_CA_Time) then
6799 Conv := Make_Function_Call (Loc,
6800 New_Reference_To (RTE (RO_CA_To_Duration), Loc),
6801 New_List (New_Reference_To (Delay_Min, Loc)));
6805 (Is_RTE (Base_Type (Etype (Time_Type)), RO_RT_Time));
6807 Conv := Make_Function_Call (Loc,
6808 New_Reference_To (RTE (RO_RT_To_Duration), Loc),
6809 New_List (New_Reference_To (Delay_Min, Loc)));
6812 Stmt := Make_Assignment_Statement (Loc,
6813 Name => New_Reference_To (D, Loc),
6814 Expression => Conv);
6816 -- Change the value for Accept_Modes. (Else_Mode -> Delay_Mode)
6818 Parms := Parameter_Associations (Select_Call);
6819 Parm := First (Parms);
6821 while Present (Parm)
6822 and then Parm /= Select_Mode
6827 pragma Assert (Present (Parm));
6828 Rewrite (Parm, New_Reference_To (RTE (RE_Delay_Mode), Loc));
6831 -- Prepare two new parameters of Duration and Delay_Mode type
6832 -- which represent the value and the mode of the minimum delay.
6835 Insert_After (Parm, New_Reference_To (M, Loc));
6836 Insert_After (Parm, New_Reference_To (D, Loc));
6838 -- Create a call to RTS.
6840 Rewrite (Select_Call,
6841 Make_Procedure_Call_Statement (Loc,
6842 Name => New_Reference_To (RTE (RE_Timed_Selective_Wait), Loc),
6843 Parameter_Associations => Parms));
6845 -- This new call should follow the calculation of the
6848 Insert_List_Before (Select_Call, Delay_List);
6852 Make_Implicit_If_Statement (N,
6853 Condition => New_Reference_To (Guard_Open, Loc),
6855 New_List (New_Copy_Tree (Stmt),
6856 New_Copy_Tree (Select_Call)),
6857 Else_Statements => Accept_Or_Raise);
6858 Rewrite (Select_Call, Stmt);
6860 Insert_Before (Select_Call, Stmt);
6864 Make_Implicit_If_Statement (N,
6865 Condition => Make_Op_Eq (Loc,
6866 Left_Opnd => New_Reference_To (Xnam, Loc),
6868 New_Reference_To (RTE (RE_No_Rendezvous), Loc)),
6870 Then_Statements => Delay_Case,
6871 Else_Statements => Accept_Case);
6873 Append (Cases, Stats);
6877 -- Replace accept statement with appropriate block
6880 Make_Block_Statement (Loc,
6881 Declarations => Decls,
6882 Handled_Statement_Sequence =>
6883 Make_Handled_Sequence_Of_Statements (Loc,
6884 Statements => Stats));
6889 -- Note: have to worry more about abort deferral in above code ???
6891 -- Final step is to unstack the Accept_Address entries for all accept
6892 -- statements appearing in accept alternatives in the select statement
6894 Alt := First (Alts);
6895 while Present (Alt) loop
6896 if Nkind (Alt) = N_Accept_Alternative then
6897 Remove_Last_Elmt (Accept_Address
6898 (Entity (Entry_Direct_Name (Accept_Statement (Alt)))));
6903 end Expand_N_Selective_Accept;
6905 --------------------------------------
6906 -- Expand_N_Single_Task_Declaration --
6907 --------------------------------------
6909 -- Single task declarations should never be present after semantic
6910 -- analysis, since we expect them to be replaced by a declaration of
6911 -- an anonymous task type, followed by a declaration of the task
6912 -- object. We include this routine to make sure that is happening!
6914 procedure Expand_N_Single_Task_Declaration (N : Node_Id) is
6916 raise Program_Error;
6917 end Expand_N_Single_Task_Declaration;
6919 ------------------------
6920 -- Expand_N_Task_Body --
6921 ------------------------
6923 -- Given a task body
6925 -- task body tname is
6931 -- This expansion routine converts it into a procedure and sets the
6932 -- elaboration flag for the procedure to true, to represent the fact
6933 -- that the task body is now elaborated:
6935 -- procedure tnameB (_Task : access tnameV) is
6936 -- discriminal : dtype renames _Task.discriminant;
6938 -- procedure _clean is
6942 -- Abort_Undefer.all;
6947 -- Abort_Undefer.all;
6949 -- System.Task_Stages.Complete_Activation;
6957 -- In addition, if the task body is an activator, then a call to
6958 -- activate tasks is added at the start of the statements, before
6959 -- the call to Complete_Activation, and if in addition the task is
6960 -- a master then it must be established as a master. These calls are
6961 -- inserted and analyzed in Expand_Cleanup_Actions, when the
6962 -- Handled_Sequence_Of_Statements is expanded.
6964 -- There is one discriminal declaration line generated for each
6965 -- discriminant that is present to provide an easy reference point
6966 -- for discriminant references inside the body (see Exp_Ch2.Expand_Name).
6968 -- Note on relationship to GNARLI definition. In the GNARLI definition,
6969 -- task body procedures have a profile (Arg : System.Address). That is
6970 -- needed because GNARLI has to use the same access-to-subprogram type
6971 -- for all task types. We depend here on knowing that in GNAT, passing
6972 -- an address argument by value is identical to passing a record value
6973 -- by access (in either case a single pointer is passed), so even though
6974 -- this procedure has the wrong profile. In fact it's all OK, since the
6975 -- callings sequence is identical.
6977 procedure Expand_N_Task_Body (N : Node_Id) is
6978 Loc : constant Source_Ptr := Sloc (N);
6979 Ttyp : constant Entity_Id := Corresponding_Spec (N);
6984 -- Here we start the expansion by generating discriminal declarations
6986 Add_Discriminal_Declarations (Declarations (N), Ttyp, Name_uTask, Loc);
6988 -- Add a call to Abort_Undefer at the very beginning of the task
6989 -- body since this body is called with abort still deferred.
6991 if Abort_Allowed then
6992 Call := Build_Runtime_Call (Loc, RE_Abort_Undefer);
6994 (First (Statements (Handled_Statement_Sequence (N))), Call);
6998 -- The statement part has already been protected with an at_end and
6999 -- cleanup actions. The call to Complete_Activation must be placed
7000 -- at the head of the sequence of statements of that block. The
7001 -- declarations have been merged in this sequence of statements but
7002 -- the first real statement is accessible from the First_Real_Statement
7003 -- field (which was set for exactly this purpose).
7005 if Restricted_Profile then
7006 Call := Build_Runtime_Call (Loc, RE_Complete_Restricted_Activation);
7008 Call := Build_Runtime_Call (Loc, RE_Complete_Activation);
7012 (First_Real_Statement (Handled_Statement_Sequence (N)), Call);
7016 Make_Subprogram_Body (Loc,
7017 Specification => Build_Task_Proc_Specification (Ttyp),
7018 Declarations => Declarations (N),
7019 Handled_Statement_Sequence => Handled_Statement_Sequence (N));
7021 -- If the task contains generic instantiations, cleanup actions
7022 -- are delayed until after instantiation. Transfer the activation
7023 -- chain to the subprogram, to insure that the activation call is
7024 -- properly generated. It the task body contains inner tasks, indicate
7025 -- that the subprogram is a task master.
7027 if Delay_Cleanups (Ttyp) then
7028 Set_Activation_Chain_Entity (New_N, Activation_Chain_Entity (N));
7029 Set_Is_Task_Master (New_N, Is_Task_Master (N));
7035 -- Set elaboration flag immediately after task body. If the body
7036 -- is a subunit, the flag is set in the declarative part that
7037 -- contains the stub.
7039 if Nkind (Parent (N)) /= N_Subunit then
7041 Make_Assignment_Statement (Loc,
7043 Make_Identifier (Loc, New_External_Name (Chars (Ttyp), 'E')),
7044 Expression => New_Reference_To (Standard_True, Loc)));
7046 end Expand_N_Task_Body;
7048 ------------------------------------
7049 -- Expand_N_Task_Type_Declaration --
7050 ------------------------------------
7052 -- We have several things to do. First we must create a Boolean flag used
7053 -- to mark if the body is elaborated yet. This variable gets set to True
7054 -- when the body of the task is elaborated (we can't rely on the normal
7055 -- ABE mechanism for the task body, since we need to pass an access to
7056 -- this elaboration boolean to the runtime routines).
7058 -- taskE : aliased Boolean := False;
7060 -- Next a variable is declared to hold the task stack size (either
7061 -- the default : Unspecified_Size, or a value that is set by a pragma
7062 -- Storage_Size). If the value of the pragma Storage_Size is static, then
7063 -- the variable is initialized with this value:
7065 -- taskZ : Size_Type := Unspecified_Size;
7067 -- taskZ : Size_Type := Size_Type (size_expression);
7069 -- Next we create a corresponding record type declaration used to represent
7070 -- values of this task. The general form of this type declaration is
7072 -- type taskV (discriminants) is record
7073 -- _Task_Id : Task_Id;
7074 -- entry_family : array (bounds) of Void;
7075 -- _Priority : Integer := priority_expression;
7076 -- _Size : Size_Type := Size_Type (size_expression);
7077 -- _Task_Info : Task_Info_Type := task_info_expression;
7080 -- The discriminants are present only if the corresponding task type has
7081 -- discriminants, and they exactly mirror the task type discriminants.
7083 -- The Id field is always present. It contains the Task_Id value, as
7084 -- set by the call to Create_Task. Note that although the task is
7085 -- limited, the task value record type is not limited, so there is no
7086 -- problem in passing this field as an out parameter to Create_Task.
7088 -- One entry_family component is present for each entry family in the
7089 -- task definition. The bounds correspond to the bounds of the entry
7090 -- family (which may depend on discriminants). The element type is
7091 -- void, since we only need the bounds information for determining
7092 -- the entry index. Note that the use of an anonymous array would
7093 -- normally be illegal in this context, but this is a parser check,
7094 -- and the semantics is quite prepared to handle such a case.
7096 -- The _Size field is present only if a Storage_Size pragma appears in
7097 -- the task definition. The expression captures the argument that was
7098 -- present in the pragma, and is used to override the task stack size
7099 -- otherwise associated with the task type.
7101 -- The _Priority field is present only if a Priority or Interrupt_Priority
7102 -- pragma appears in the task definition. The expression captures the
7103 -- argument that was present in the pragma, and is used to provide
7104 -- the Size parameter to the call to Create_Task.
7106 -- The _Task_Info field is present only if a Task_Info pragma appears in
7107 -- the task definition. The expression captures the argument that was
7108 -- present in the pragma, and is used to provide the Task_Image parameter
7109 -- to the call to Create_Task.
7111 -- When a task is declared, an instance of the task value record is
7112 -- created. The elaboration of this declaration creates the correct
7113 -- bounds for the entry families, and also evaluates the size, priority,
7114 -- and task_Info expressions if needed. The initialization routine for
7115 -- the task type itself then calls Create_Task with appropriate
7116 -- parameters to initialize the value of the Task_Id field.
7118 -- Note: the address of this record is passed as the "Discriminants"
7119 -- parameter for Create_Task. Since Create_Task merely passes this onto
7120 -- the body procedure, it does not matter that it does not quite match
7121 -- the GNARLI model of what is being passed (the record contains more
7122 -- than just the discriminants, but the discriminants can be found from
7123 -- the record value).
7125 -- The Entity_Id for this created record type is placed in the
7126 -- Corresponding_Record_Type field of the associated task type entity.
7128 -- Next we create a procedure specification for the task body procedure:
7130 -- procedure taskB (_Task : access taskV);
7132 -- Note that this must come after the record type declaration, since
7133 -- the spec refers to this type. It turns out that the initialization
7134 -- procedure for the value type references the task body spec, but that's
7135 -- fine, since it won't be generated till the freeze point for the type,
7136 -- which is certainly after the task body spec declaration.
7138 -- Finally, we set the task index value field of the entry attribute in
7139 -- the case of a simple entry.
7141 procedure Expand_N_Task_Type_Declaration (N : Node_Id) is
7142 Loc : constant Source_Ptr := Sloc (N);
7143 Tasktyp : constant Entity_Id := Etype (Defining_Identifier (N));
7144 Tasknm : constant Name_Id := Chars (Tasktyp);
7145 Taskdef : constant Node_Id := Task_Definition (N);
7147 Proc_Spec : Node_Id;
7149 Rec_Ent : Entity_Id;
7151 Elab_Decl : Node_Id;
7152 Size_Decl : Node_Id;
7153 Body_Decl : Node_Id;
7156 -- If already expanded, nothing to do
7158 if Present (Corresponding_Record_Type (Tasktyp)) then
7162 -- Here we will do the expansion
7164 Rec_Decl := Build_Corresponding_Record (N, Tasktyp, Loc);
7165 Rec_Ent := Defining_Identifier (Rec_Decl);
7166 Cdecls := Component_Items (Component_List
7167 (Type_Definition (Rec_Decl)));
7169 Qualify_Entity_Names (N);
7171 -- First create the elaboration variable
7174 Make_Object_Declaration (Loc,
7175 Defining_Identifier =>
7176 Make_Defining_Identifier (Sloc (Tasktyp),
7177 Chars => New_External_Name (Tasknm, 'E')),
7178 Aliased_Present => True,
7179 Object_Definition => New_Reference_To (Standard_Boolean, Loc),
7180 Expression => New_Reference_To (Standard_False, Loc));
7181 Insert_After (N, Elab_Decl);
7183 -- Next create the declaration of the size variable (tasknmZ)
7185 Set_Storage_Size_Variable (Tasktyp,
7186 Make_Defining_Identifier (Sloc (Tasktyp),
7187 Chars => New_External_Name (Tasknm, 'Z')));
7189 if Present (Taskdef) and then Has_Storage_Size_Pragma (Taskdef) and then
7190 Is_Static_Expression (Expression (First (
7191 Pragma_Argument_Associations (Find_Task_Or_Protected_Pragma (
7192 Taskdef, Name_Storage_Size)))))
7195 Make_Object_Declaration (Loc,
7196 Defining_Identifier => Storage_Size_Variable (Tasktyp),
7197 Object_Definition => New_Reference_To (RTE (RE_Size_Type), Loc),
7199 Convert_To (RTE (RE_Size_Type),
7202 Pragma_Argument_Associations (
7203 Find_Task_Or_Protected_Pragma
7204 (Taskdef, Name_Storage_Size)))))));
7208 Make_Object_Declaration (Loc,
7209 Defining_Identifier => Storage_Size_Variable (Tasktyp),
7210 Object_Definition => New_Reference_To (RTE (RE_Size_Type), Loc),
7211 Expression => New_Reference_To (RTE (RE_Unspecified_Size), Loc));
7214 Insert_After (Elab_Decl, Size_Decl);
7216 -- Next build the rest of the corresponding record declaration.
7217 -- This is done last, since the corresponding record initialization
7218 -- procedure will reference the previously created entities.
7220 -- Fill in the component declarations. First the _Task_Id field.
7223 Make_Component_Declaration (Loc,
7224 Defining_Identifier =>
7225 Make_Defining_Identifier (Loc, Name_uTask_Id),
7226 Component_Definition =>
7227 Make_Component_Definition (Loc,
7228 Aliased_Present => False,
7229 Subtype_Indication => New_Reference_To (RTE (RO_ST_Task_ID),
7232 -- Add components for entry families
7234 Collect_Entry_Families (Loc, Cdecls, Size_Decl, Tasktyp);
7236 -- Add the _Priority component if a Priority pragma is present
7238 if Present (Taskdef) and then Has_Priority_Pragma (Taskdef) then
7240 Prag : constant Node_Id :=
7241 Find_Task_Or_Protected_Pragma (Taskdef, Name_Priority);
7245 Expr := First (Pragma_Argument_Associations (Prag));
7247 if Nkind (Expr) = N_Pragma_Argument_Association then
7248 Expr := Expression (Expr);
7251 Expr := New_Copy_Tree (Expr);
7253 -- Add conversion to proper type to do range check if required
7254 -- Note that for runtime units, we allow out of range interrupt
7255 -- priority values to be used in a priority pragma. This is for
7256 -- the benefit of some versions of System.Interrupts which use
7257 -- a special server task with maximum interrupt priority.
7259 if Chars (Prag) = Name_Priority
7260 and then not GNAT_Mode
7262 Rewrite (Expr, Convert_To (RTE (RE_Priority), Expr));
7264 Rewrite (Expr, Convert_To (RTE (RE_Any_Priority), Expr));
7268 Make_Component_Declaration (Loc,
7269 Defining_Identifier =>
7270 Make_Defining_Identifier (Loc, Name_uPriority),
7271 Component_Definition =>
7272 Make_Component_Definition (Loc,
7273 Aliased_Present => False,
7274 Subtype_Indication => New_Reference_To (Standard_Integer,
7276 Expression => Expr));
7280 -- Add the _Task_Size component if a Storage_Size pragma is present
7282 if Present (Taskdef)
7283 and then Has_Storage_Size_Pragma (Taskdef)
7286 Make_Component_Declaration (Loc,
7287 Defining_Identifier =>
7288 Make_Defining_Identifier (Loc, Name_uSize),
7290 Component_Definition =>
7291 Make_Component_Definition (Loc,
7292 Aliased_Present => False,
7293 Subtype_Indication => New_Reference_To (RTE (RE_Size_Type),
7297 Convert_To (RTE (RE_Size_Type),
7300 Pragma_Argument_Associations (
7301 Find_Task_Or_Protected_Pragma
7302 (Taskdef, Name_Storage_Size))))))));
7305 -- Add the _Task_Info component if a Task_Info pragma is present
7307 if Present (Taskdef) and then Has_Task_Info_Pragma (Taskdef) then
7309 Make_Component_Declaration (Loc,
7310 Defining_Identifier =>
7311 Make_Defining_Identifier (Loc, Name_uTask_Info),
7313 Component_Definition =>
7314 Make_Component_Definition (Loc,
7315 Aliased_Present => False,
7316 Subtype_Indication =>
7317 New_Reference_To (RTE (RE_Task_Info_Type), Loc)),
7319 Expression => New_Copy (
7321 Pragma_Argument_Associations (
7322 Find_Task_Or_Protected_Pragma
7323 (Taskdef, Name_Task_Info)))))));
7326 Insert_After (Size_Decl, Rec_Decl);
7328 -- Analyze the record declaration immediately after construction,
7329 -- because the initialization procedure is needed for single task
7330 -- declarations before the next entity is analyzed.
7334 -- Create the declaration of the task body procedure
7336 Proc_Spec := Build_Task_Proc_Specification (Tasktyp);
7338 Make_Subprogram_Declaration (Loc,
7339 Specification => Proc_Spec);
7341 Insert_After (Rec_Decl, Body_Decl);
7343 -- The subprogram does not comes from source, so we have to indicate
7344 -- the need for debugging information explicitly.
7346 Set_Needs_Debug_Info
7347 (Defining_Entity (Proc_Spec), Comes_From_Source (Original_Node (N)));
7349 -- Now we can freeze the corresponding record. This needs manually
7350 -- freezing, since it is really part of the task type, and the task
7351 -- type is frozen at this stage. We of course need the initialization
7352 -- procedure for this corresponding record type and we won't get it
7353 -- in time if we don't freeze now.
7356 L : constant List_Id := Freeze_Entity (Rec_Ent, Loc);
7359 if Is_Non_Empty_List (L) then
7360 Insert_List_After (Body_Decl, L);
7364 -- Complete the expansion of access types to the current task
7365 -- type, if any were declared.
7367 Expand_Previous_Access_Type (Tasktyp);
7368 end Expand_N_Task_Type_Declaration;
7370 -------------------------------
7371 -- Expand_N_Timed_Entry_Call --
7372 -------------------------------
7374 -- A timed entry call in normal case is not implemented using ATC
7375 -- mechanism anymore for efficiency reason.
7385 -- is expanded as follow:
7387 -- 1) When T.E is a task entry_call;
7391 -- X : Task_Entry_Index := <entry index>;
7392 -- DX : Duration := To_Duration (D);
7393 -- M : Delay_Mode := <discriminant>;
7394 -- P : parms := (parm, parm, parm);
7397 -- Timed_Protected_Entry_Call (<acceptor-task>, X, P'Address,
7406 -- 2) When T.E is a protected entry_call;
7410 -- X : Protected_Entry_Index := <entry index>;
7411 -- DX : Duration := To_Duration (D);
7412 -- M : Delay_Mode := <discriminant>;
7413 -- P : parms := (parm, parm, parm);
7416 -- Timed_Protected_Entry_Call (<object>'unchecked_access, X,
7417 -- P'Address, DX, M, B);
7425 procedure Expand_N_Timed_Entry_Call (N : Node_Id) is
7426 Loc : constant Source_Ptr := Sloc (N);
7429 Entry_Call_Statement (Entry_Call_Alternative (N));
7430 E_Stats : constant List_Id :=
7431 Statements (Entry_Call_Alternative (N));
7432 D_Stat : constant Node_Id :=
7433 Delay_Statement (Delay_Alternative (N));
7434 D_Stats : constant List_Id :=
7435 Statements (Delay_Alternative (N));
7458 -- The arguments in the call may require dynamic allocation, and the
7459 -- call statement may have been transformed into a block. The block
7460 -- may contain additional declarations for internal entities, and the
7461 -- original call is found by sequential search.
7463 if Nkind (E_Call) = N_Block_Statement then
7464 E_Call := First (Statements (Handled_Statement_Sequence (E_Call)));
7466 while Nkind (E_Call) /= N_Procedure_Call_Statement
7467 and then Nkind (E_Call) /= N_Entry_Call_Statement
7473 -- Build an entry call using Simple_Entry_Call. We will use this as the
7474 -- base for creating appropriate calls.
7476 Extract_Entry (E_Call, Concval, Ename, Index);
7477 Build_Simple_Entry_Call (E_Call, Concval, Ename, Index);
7479 Stmts := Statements (Handled_Statement_Sequence (E_Call));
7480 Decls := Declarations (E_Call);
7486 Dtyp := Base_Type (Etype (Expression (D_Stat)));
7488 -- Use the type of the delay expression (Calendar or Real_Time)
7489 -- to generate the appropriate conversion.
7491 if Nkind (D_Stat) = N_Delay_Relative_Statement then
7492 Disc := Make_Integer_Literal (Loc, 0);
7493 Conv := Relocate_Node (Expression (D_Stat));
7495 elsif Is_RTE (Dtyp, RO_CA_Time) then
7496 Disc := Make_Integer_Literal (Loc, 1);
7497 Conv := Make_Function_Call (Loc,
7498 New_Reference_To (RTE (RO_CA_To_Duration), Loc),
7499 New_List (New_Copy (Expression (D_Stat))));
7501 else pragma Assert (Is_RTE (Dtyp, RO_RT_Time));
7502 Disc := Make_Integer_Literal (Loc, 2);
7503 Conv := Make_Function_Call (Loc,
7504 New_Reference_To (RTE (RO_RT_To_Duration), Loc),
7505 New_List (New_Copy (Expression (D_Stat))));
7508 -- Create Duration and Delay_Mode objects for passing a delay value
7510 D := Make_Defining_Identifier (Loc, New_Internal_Name ('D'));
7511 M := Make_Defining_Identifier (Loc, New_Internal_Name ('M'));
7514 Make_Object_Declaration (Loc,
7515 Defining_Identifier => D,
7516 Object_Definition => New_Reference_To (Standard_Duration, Loc)));
7519 Make_Object_Declaration (Loc,
7520 Defining_Identifier => M,
7521 Object_Definition => New_Reference_To (Standard_Integer, Loc),
7522 Expression => Disc));
7524 B := Make_Defining_Identifier (Loc, Name_uB);
7526 -- Create a boolean object used for a return parameter.
7529 Make_Object_Declaration (Loc,
7530 Defining_Identifier => B,
7531 Object_Definition => New_Reference_To (Standard_Boolean, Loc)));
7533 Stmt := First (Stmts);
7535 -- Skip assignments to temporaries created for in-out parameters.
7536 -- This makes unwarranted assumptions about the shape of the expanded
7537 -- tree for the call, and should be cleaned up ???
7539 while Nkind (Stmt) /= N_Procedure_Call_Statement loop
7543 -- Do the assignement at this stage only because the evaluation of the
7544 -- expression must not occur before (see ACVC C97302A).
7546 Insert_Before (Stmt,
7547 Make_Assignment_Statement (Loc,
7548 Name => New_Reference_To (D, Loc),
7549 Expression => Conv));
7553 Parms := Parameter_Associations (Call);
7555 -- For a protected type, we build a Timed_Protected_Entry_Call
7557 if Is_Protected_Type (Etype (Concval)) then
7559 -- Create a new call statement
7561 Parm := First (Parms);
7563 while Present (Parm)
7564 and then not Is_RTE (Etype (Parm), RE_Call_Modes)
7569 Dummy := Remove_Next (Next (Parm));
7571 -- In case some garbage is following the Cancel_Param, remove.
7573 Dummy := Next (Parm);
7575 -- Remove the mode of the Protected_Entry_Call call, the
7576 -- Communication_Block of the Protected_Entry_Call call, and add a
7577 -- Duration and a Delay_Mode parameter
7579 pragma Assert (Present (Parm));
7580 Rewrite (Parm, New_Reference_To (D, Loc));
7582 Rewrite (Dummy, New_Reference_To (M, Loc));
7584 -- Add a Boolean flag for successful entry call.
7586 Append_To (Parms, New_Reference_To (B, Loc));
7589 or else Restriction_Active (No_Entry_Queue) = False
7590 or else Number_Entries (Etype (Concval)) > 1
7593 Make_Procedure_Call_Statement (Loc,
7595 New_Reference_To (RTE (RE_Timed_Protected_Entry_Call), Loc),
7596 Parameter_Associations => Parms));
7599 Parm := First (Parms);
7601 while Present (Parm)
7602 and then not Is_RTE (Etype (Parm), RE_Protected_Entry_Index)
7610 Make_Procedure_Call_Statement (Loc,
7611 Name => New_Reference_To (
7612 RTE (RE_Timed_Protected_Single_Entry_Call), Loc),
7613 Parameter_Associations => Parms));
7616 -- For the task case, build a Timed_Task_Entry_Call
7619 -- Create a new call statement
7621 Append_To (Parms, New_Reference_To (D, Loc));
7622 Append_To (Parms, New_Reference_To (M, Loc));
7623 Append_To (Parms, New_Reference_To (B, Loc));
7626 Make_Procedure_Call_Statement (Loc,
7627 Name => New_Reference_To (RTE (RE_Timed_Task_Entry_Call), Loc),
7628 Parameter_Associations => Parms));
7633 Make_Implicit_If_Statement (N,
7634 Condition => New_Reference_To (B, Loc),
7635 Then_Statements => E_Stats,
7636 Else_Statements => D_Stats));
7639 Make_Block_Statement (Loc,
7640 Declarations => Decls,
7641 Handled_Statement_Sequence =>
7642 Make_Handled_Sequence_Of_Statements (Loc, Stmts)));
7645 end Expand_N_Timed_Entry_Call;
7647 ----------------------------------------
7648 -- Expand_Protected_Body_Declarations --
7649 ----------------------------------------
7651 -- Part of the expansion of a protected body involves the creation of
7652 -- a declaration that can be referenced from the statement sequences of
7653 -- the entry bodies:
7657 -- This declaration is inserted in the declarations of the service
7658 -- entries procedure for the protected body, and it is important that
7659 -- it be inserted before the statements of the entry body statement
7660 -- sequences are analyzed. Thus it would be too late to create this
7661 -- declaration in the Expand_N_Protected_Body routine, which is why
7662 -- there is a separate procedure to be called directly from Sem_Ch9.
7664 -- Ann is used to hold the address of the record containing the parameters
7665 -- (see Expand_N_Entry_Call for more details on how this record is built).
7666 -- References to the parameters do an unchecked conversion of this address
7667 -- to a pointer to the required record type, and then access the field that
7668 -- holds the value of the required parameter. The entity for the address
7669 -- variable is held as the top stack element (i.e. the last element) of the
7670 -- Accept_Address stack in the corresponding entry entity, and this element
7671 -- must be set in place before the statements are processed.
7673 -- No stack is needed for entry bodies, since they cannot be nested, but
7674 -- it is kept for consistency between protected and task entries. The
7675 -- stack will never contain more than one element. There is also only one
7676 -- such variable for a given protected body, but this is placed on the
7677 -- Accept_Address stack of all of the entries, again for consistency.
7679 -- To expand the requeue statement, a label is provided at the end of
7680 -- the loop in the entry service routine created by the expander (see
7681 -- Expand_N_Protected_Body for details), so that the statement can be
7682 -- skipped after the requeue is complete. This label is created during the
7683 -- expansion of the entry body, which will take place after the expansion
7684 -- of the requeue statements that it contains, so a placeholder defining
7685 -- identifier is associated with the task type here.
7687 -- Another label is provided following case statement created by the
7688 -- expander. This label is need for implementing return statement from
7689 -- entry body so that a return can be expanded as a goto to this label.
7690 -- This label is created during the expansion of the entry body, which
7691 -- will take place after the expansion of the return statements that it
7692 -- contains. Therefore, just like the label for expanding requeues, we
7693 -- need another placeholder for the label.
7695 procedure Expand_Protected_Body_Declarations
7697 Spec_Id : Entity_Id)
7702 if No_Run_Time_Mode then
7703 Error_Msg_CRT ("protected body", N);
7706 elsif Expander_Active then
7708 -- Associate privals with the first subprogram or entry
7709 -- body to be expanded. These are used to expand references
7710 -- to private data objects.
7712 Op := First_Protected_Operation (Declarations (N));
7714 if Present (Op) then
7715 Set_Discriminals (Parent (Spec_Id));
7716 Set_Privals (Parent (Spec_Id), Op, Sloc (N));
7719 end Expand_Protected_Body_Declarations;
7721 -------------------------
7722 -- External_Subprogram --
7723 -------------------------
7725 function External_Subprogram (E : Entity_Id) return Entity_Id is
7726 Subp : constant Entity_Id := Protected_Body_Subprogram (E);
7727 Decl : constant Node_Id := Unit_Declaration_Node (E);
7730 -- If the protected operation is defined in the visible part of the
7731 -- protected type, or if it is an interrupt handler, the internal and
7732 -- external subprograms follow each other on the entity chain. If the
7733 -- operation is defined in the private part of the type, there is no
7734 -- need for a separate locking version of the operation, and internal
7735 -- calls use the protected_body_subprogram directly.
7737 if List_Containing (Decl) = Visible_Declarations (Parent (Decl))
7738 or else Is_Interrupt_Handler (E)
7740 return Next_Entity (Subp);
7744 end External_Subprogram;
7750 procedure Extract_Entry
7752 Concval : out Node_Id;
7753 Ename : out Node_Id;
7754 Index : out Node_Id)
7756 Nam : constant Node_Id := Name (N);
7759 -- For a simple entry, the name is a selected component, with the
7760 -- prefix being the task value, and the selector being the entry.
7762 if Nkind (Nam) = N_Selected_Component then
7763 Concval := Prefix (Nam);
7764 Ename := Selector_Name (Nam);
7767 -- For a member of an entry family, the name is an indexed
7768 -- component where the prefix is a selected component,
7769 -- whose prefix in turn is the task value, and whose
7770 -- selector is the entry family. The single expression in
7771 -- the expressions list of the indexed component is the
7772 -- subscript for the family.
7775 pragma Assert (Nkind (Nam) = N_Indexed_Component);
7776 Concval := Prefix (Prefix (Nam));
7777 Ename := Selector_Name (Prefix (Nam));
7778 Index := First (Expressions (Nam));
7786 function Family_Offset
7790 Ttyp : Entity_Id) return Node_Id
7792 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id;
7793 -- If one of the bounds is a reference to a discriminant, replace
7794 -- with corresponding discriminal of type. Within the body of a task
7795 -- retrieve the renamed discriminant by simple visibility, using its
7796 -- generated name. Within a protected object, find the original dis-
7797 -- criminant and replace it with the discriminal of the current prot-
7800 ------------------------------
7801 -- Convert_Discriminant_Ref --
7802 ------------------------------
7804 function Convert_Discriminant_Ref (Bound : Node_Id) return Node_Id is
7805 Loc : constant Source_Ptr := Sloc (Bound);
7810 if Is_Entity_Name (Bound)
7811 and then Ekind (Entity (Bound)) = E_Discriminant
7813 if Is_Task_Type (Ttyp)
7814 and then Has_Completion (Ttyp)
7816 B := Make_Identifier (Loc, Chars (Entity (Bound)));
7817 Find_Direct_Name (B);
7819 elsif Is_Protected_Type (Ttyp) then
7820 D := First_Discriminant (Ttyp);
7822 while Chars (D) /= Chars (Entity (Bound)) loop
7823 Next_Discriminant (D);
7826 B := New_Reference_To (Discriminal (D), Loc);
7829 B := New_Reference_To (Discriminal (Entity (Bound)), Loc);
7832 elsif Nkind (Bound) = N_Attribute_Reference then
7836 B := New_Copy_Tree (Bound);
7840 Make_Attribute_Reference (Loc,
7841 Attribute_Name => Name_Pos,
7842 Prefix => New_Occurrence_Of (Etype (Bound), Loc),
7843 Expressions => New_List (B));
7844 end Convert_Discriminant_Ref;
7846 -- Start of processing for Family_Offset
7850 Make_Op_Subtract (Loc,
7851 Left_Opnd => Convert_Discriminant_Ref (Hi),
7852 Right_Opnd => Convert_Discriminant_Ref (Lo));
7859 function Family_Size
7863 Ttyp : Entity_Id) return Node_Id
7868 if Is_Task_Type (Ttyp) then
7869 Ityp := RTE (RE_Task_Entry_Index);
7871 Ityp := RTE (RE_Protected_Entry_Index);
7875 Make_Attribute_Reference (Loc,
7876 Prefix => New_Reference_To (Ityp, Loc),
7877 Attribute_Name => Name_Max,
7878 Expressions => New_List (
7881 Family_Offset (Loc, Hi, Lo, Ttyp),
7883 Make_Integer_Literal (Loc, 1)),
7884 Make_Integer_Literal (Loc, 0)));
7887 -----------------------------------
7888 -- Find_Task_Or_Protected_Pragma --
7889 -----------------------------------
7891 function Find_Task_Or_Protected_Pragma
7893 P : Name_Id) return Node_Id
7898 N := First (Visible_Declarations (T));
7900 while Present (N) loop
7901 if Nkind (N) = N_Pragma then
7902 if Chars (N) = P then
7905 elsif P = Name_Priority
7906 and then Chars (N) = Name_Interrupt_Priority
7919 N := First (Private_Declarations (T));
7921 while Present (N) loop
7922 if Nkind (N) = N_Pragma then
7923 if Chars (N) = P then
7926 elsif P = Name_Priority
7927 and then Chars (N) = Name_Interrupt_Priority
7940 raise Program_Error;
7941 end Find_Task_Or_Protected_Pragma;
7943 -------------------------------
7944 -- First_Protected_Operation --
7945 -------------------------------
7947 function First_Protected_Operation (D : List_Id) return Node_Id is
7951 First_Op := First (D);
7952 while Present (First_Op)
7953 and then Nkind (First_Op) /= N_Subprogram_Body
7954 and then Nkind (First_Op) /= N_Entry_Body
7960 end First_Protected_Operation;
7962 --------------------------------
7963 -- Index_Constant_Declaration --
7964 --------------------------------
7966 function Index_Constant_Declaration
7968 Index_Id : Entity_Id;
7969 Prot : Entity_Id) return List_Id
7971 Loc : constant Source_Ptr := Sloc (N);
7972 Decls : constant List_Id := New_List;
7973 Index_Con : constant Entity_Id := Entry_Index_Constant (Index_Id);
7974 Index_Typ : Entity_Id;
7976 Hi : Node_Id := Type_High_Bound (Etype (Index_Id));
7977 Lo : Node_Id := Type_Low_Bound (Etype (Index_Id));
7979 function Replace_Discriminant (Bound : Node_Id) return Node_Id;
7980 -- The bounds of the entry index may depend on discriminants, so
7981 -- each declaration of an entry_index_constant must have its own
7982 -- subtype declaration, using the local renaming of the object discri-
7985 --------------------------
7986 -- Replace_Discriminant --
7987 --------------------------
7989 function Replace_Discriminant (Bound : Node_Id) return Node_Id is
7991 if Nkind (Bound) = N_Identifier
7992 and then Ekind (Entity (Bound)) = E_Constant
7993 and then Present (Discriminal_Link (Entity (Bound)))
7995 return Make_Identifier (Loc, Chars (Entity (Bound)));
7997 return Duplicate_Subexpr (Bound);
7999 end Replace_Discriminant;
8001 -- Start of processing for Index_Constant_Declaration
8004 Set_Discriminal_Link (Index_Con, Index_Id);
8007 Original_Node (Discrete_Subtype_Definition (Parent (Index_Id))))
8009 -- Simple case: entry family is given by a subtype mark, and index
8010 -- constant has the same type, no replacement needed.
8012 Index_Typ := Etype (Index_Id);
8015 Hi := Replace_Discriminant (Hi);
8016 Lo := Replace_Discriminant (Lo);
8018 Index_Typ := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
8021 Make_Subtype_Declaration (Loc,
8022 Defining_Identifier => Index_Typ,
8023 Subtype_Indication =>
8024 Make_Subtype_Indication (Loc,
8026 New_Occurrence_Of (Base_Type (Etype (Index_Id)), Loc),
8028 Make_Range_Constraint (Loc,
8029 Range_Expression => Make_Range (Loc, Lo, Hi)))),
8035 Make_Object_Declaration (Loc,
8036 Defining_Identifier => Index_Con,
8037 Constant_Present => True,
8038 Object_Definition => New_Occurrence_Of (Index_Typ, Loc),
8041 Make_Attribute_Reference (Loc,
8042 Prefix => New_Reference_To (Index_Typ, Loc),
8043 Attribute_Name => Name_Val,
8045 Expressions => New_List (
8049 Make_Op_Subtract (Loc,
8050 Left_Opnd => Make_Identifier (Loc, Name_uE),
8052 Entry_Index_Expression (Loc,
8053 Defining_Identifier (N), Empty, Prot)),
8056 Make_Attribute_Reference (Loc,
8057 Prefix => New_Reference_To (Index_Typ, Loc),
8058 Attribute_Name => Name_Pos,
8059 Expressions => New_List (
8060 Make_Attribute_Reference (Loc,
8061 Prefix => New_Reference_To (Index_Typ, Loc),
8062 Attribute_Name => Name_First))))))),
8066 end Index_Constant_Declaration;
8068 --------------------------------
8069 -- Make_Initialize_Protection --
8070 --------------------------------
8072 function Make_Initialize_Protection
8073 (Protect_Rec : Entity_Id) return List_Id
8075 Loc : constant Source_Ptr := Sloc (Protect_Rec);
8079 Ptyp : constant Node_Id :=
8080 Corresponding_Concurrent_Type (Protect_Rec);
8082 L : constant List_Id := New_List;
8083 Has_Entry : constant Boolean := Has_Entries (Ptyp);
8084 Restricted : constant Boolean := Restricted_Profile;
8087 -- We may need two calls to properly initialize the object, one
8088 -- to Initialize_Protection, and possibly one to Install_Handlers
8089 -- if we have a pragma Attach_Handler.
8091 -- Get protected declaration. In the case of a task type declaration,
8092 -- this is simply the parent of the protected type entity.
8093 -- In the single protected object
8094 -- declaration, this parent will be the implicit type, and we can find
8095 -- the corresponding single protected object declaration by
8096 -- searching forward in the declaration list in the tree.
8097 -- ??? I am not sure that the test for N_Single_Protected_Declaration
8098 -- is needed here. Nodes of this type should have been removed
8099 -- during semantic analysis.
8101 Pdec := Parent (Ptyp);
8103 while Nkind (Pdec) /= N_Protected_Type_Declaration
8104 and then Nkind (Pdec) /= N_Single_Protected_Declaration
8109 -- Now we can find the object definition from this declaration
8111 Pdef := Protected_Definition (Pdec);
8113 -- Build the parameter list for the call. Note that _Init is the name
8114 -- of the formal for the object to be initialized, which is the task
8115 -- value record itself.
8119 -- Object parameter. This is a pointer to the object of type
8120 -- Protection used by the GNARL to control the protected object.
8123 Make_Attribute_Reference (Loc,
8125 Make_Selected_Component (Loc,
8126 Prefix => Make_Identifier (Loc, Name_uInit),
8127 Selector_Name => Make_Identifier (Loc, Name_uObject)),
8128 Attribute_Name => Name_Unchecked_Access));
8130 -- Priority parameter. Set to Unspecified_Priority unless there is a
8131 -- priority pragma, in which case we take the value from the pragma,
8132 -- or there is an interrupt pragma and no priority pragma, and we
8133 -- set the ceiling to Interrupt_Priority'Last, an implementation-
8134 -- defined value, see D.3(10).
8137 and then Has_Priority_Pragma (Pdef)
8140 Duplicate_Subexpr_No_Checks
8143 (Pragma_Argument_Associations
8144 (Find_Task_Or_Protected_Pragma (Pdef, Name_Priority))))));
8146 elsif Has_Interrupt_Handler (Ptyp)
8147 or else Has_Attach_Handler (Ptyp)
8149 -- When no priority is specified but an xx_Handler pragma is,
8150 -- we default to System.Interrupts.Default_Interrupt_Priority,
8154 New_Reference_To (RTE (RE_Default_Interrupt_Priority), Loc));
8158 New_Reference_To (RTE (RE_Unspecified_Priority), Loc));
8162 or else Has_Interrupt_Handler (Ptyp)
8163 or else Has_Attach_Handler (Ptyp)
8165 -- Compiler_Info parameter. This parameter allows entry body
8166 -- procedures and barrier functions to be called from the runtime.
8167 -- It is a pointer to the record generated by the compiler to
8168 -- represent the protected object.
8170 if Has_Entry or else not Restricted then
8172 Make_Attribute_Reference (Loc,
8173 Prefix => Make_Identifier (Loc, Name_uInit),
8174 Attribute_Name => Name_Address));
8178 -- Entry_Bodies parameter. This is a pointer to an array of
8179 -- pointers to the entry body procedures and barrier functions
8180 -- of the object. If the protected type has no entries this
8181 -- object will not exist; in this case, pass a null.
8183 P_Arr := Entry_Bodies_Array (Ptyp);
8186 Make_Attribute_Reference (Loc,
8187 Prefix => New_Reference_To (P_Arr, Loc),
8188 Attribute_Name => Name_Unrestricted_Access));
8191 or else Restriction_Active (No_Entry_Queue) = False
8192 or else Number_Entries (Ptyp) > 1
8194 -- Find index mapping function (clumsy but ok for now).
8196 while Ekind (P_Arr) /= E_Function loop
8197 Next_Entity (P_Arr);
8201 Make_Attribute_Reference (Loc,
8203 New_Reference_To (P_Arr, Loc),
8204 Attribute_Name => Name_Unrestricted_Access));
8207 elsif not Restricted then
8208 Append_To (Args, Make_Null (Loc));
8209 Append_To (Args, Make_Null (Loc));
8213 or else Restriction_Active (No_Entry_Queue) = False
8214 or else Number_Entries (Ptyp) > 1
8217 Make_Procedure_Call_Statement (Loc,
8218 Name => New_Reference_To (
8219 RTE (RE_Initialize_Protection_Entries), Loc),
8220 Parameter_Associations => Args));
8222 elsif not Has_Entry and then Restricted then
8224 Make_Procedure_Call_Statement (Loc,
8225 Name => New_Reference_To (
8226 RTE (RE_Initialize_Protection), Loc),
8227 Parameter_Associations => Args));
8231 Make_Procedure_Call_Statement (Loc,
8232 Name => New_Reference_To (
8233 RTE (RE_Initialize_Protection_Entry), Loc),
8234 Parameter_Associations => Args));
8239 Make_Procedure_Call_Statement (Loc,
8240 Name => New_Reference_To (RTE (RE_Initialize_Protection), Loc),
8241 Parameter_Associations => Args));
8244 if Has_Attach_Handler (Ptyp) then
8246 -- We have a list of N Attach_Handler (ProcI, ExprI),
8247 -- and we have to make the following call:
8248 -- Install_Handlers (_object,
8249 -- ((Expr1, Proc1'access), ...., (ExprN, ProcN'access));
8250 -- or, in the case of Ravenscar:
8252 -- ((Expr1, Proc1'access), ...., (ExprN, ProcN'access));
8255 Args : constant List_Id := New_List;
8256 Table : constant List_Id := New_List;
8257 Ritem : Node_Id := First_Rep_Item (Ptyp);
8260 if not Restricted then
8261 -- Appends the _object argument
8264 Make_Attribute_Reference (Loc,
8266 Make_Selected_Component (Loc,
8267 Prefix => Make_Identifier (Loc, Name_uInit),
8268 Selector_Name => Make_Identifier (Loc, Name_uObject)),
8269 Attribute_Name => Name_Unchecked_Access));
8272 -- Build the Attach_Handler table argument
8274 while Present (Ritem) loop
8275 if Nkind (Ritem) = N_Pragma
8276 and then Chars (Ritem) = Name_Attach_Handler
8279 Handler : constant Node_Id :=
8280 First (Pragma_Argument_Associations (Ritem));
8282 Interrupt : constant Node_Id := Next (Handler);
8283 Expr : constant Node_Id := Expression (Interrupt);
8287 Make_Aggregate (Loc, Expressions => New_List (
8288 Unchecked_Convert_To
8289 (RTE (RE_System_Interrupt_Id), Expr),
8290 Make_Attribute_Reference (Loc,
8291 Prefix => Make_Selected_Component (Loc,
8292 Make_Identifier (Loc, Name_uInit),
8293 Duplicate_Subexpr_No_Checks
8294 (Expression (Handler))),
8295 Attribute_Name => Name_Access))));
8299 Next_Rep_Item (Ritem);
8302 -- Appends the table argument we just built.
8303 Append_To (Args, Make_Aggregate (Loc, Table));
8305 -- Appends the Install_Handler call to the statements.
8307 Make_Procedure_Call_Statement (Loc,
8308 Name => New_Reference_To (RTE (RE_Install_Handlers), Loc),
8309 Parameter_Associations => Args));
8314 end Make_Initialize_Protection;
8316 ---------------------------
8317 -- Make_Task_Create_Call --
8318 ---------------------------
8320 function Make_Task_Create_Call (Task_Rec : Entity_Id) return Node_Id is
8321 Loc : constant Source_Ptr := Sloc (Task_Rec);
8331 Ttyp := Corresponding_Concurrent_Type (Task_Rec);
8332 Tnam := Chars (Ttyp);
8334 -- Get task declaration. In the case of a task type declaration, this
8335 -- is simply the parent of the task type entity. In the single task
8336 -- declaration, this parent will be the implicit type, and we can find
8337 -- the corresponding single task declaration by searching forward in
8338 -- the declaration list in the tree.
8339 -- ??? I am not sure that the test for N_Single_Task_Declaration
8340 -- is needed here. Nodes of this type should have been removed
8341 -- during semantic analysis.
8343 Tdec := Parent (Ttyp);
8345 while Nkind (Tdec) /= N_Task_Type_Declaration
8346 and then Nkind (Tdec) /= N_Single_Task_Declaration
8351 -- Now we can find the task definition from this declaration
8353 Tdef := Task_Definition (Tdec);
8355 -- Build the parameter list for the call. Note that _Init is the name
8356 -- of the formal for the object to be initialized, which is the task
8357 -- value record itself.
8361 -- Priority parameter. Set to Unspecified_Priority unless there is a
8362 -- priority pragma, in which case we take the value from the pragma.
8365 and then Has_Priority_Pragma (Tdef)
8368 Make_Selected_Component (Loc,
8369 Prefix => Make_Identifier (Loc, Name_uInit),
8370 Selector_Name => Make_Identifier (Loc, Name_uPriority)));
8374 New_Reference_To (RTE (RE_Unspecified_Priority), Loc));
8377 -- Size parameter. If no Storage_Size pragma is present, then
8378 -- the size is taken from the taskZ variable for the type, which
8379 -- is either Unspecified_Size, or has been reset by the use of
8380 -- a Storage_Size attribute definition clause. If a pragma is
8381 -- present, then the size is taken from the _Size field of the
8382 -- task value record, which was set from the pragma value.
8385 and then Has_Storage_Size_Pragma (Tdef)
8388 Make_Selected_Component (Loc,
8389 Prefix => Make_Identifier (Loc, Name_uInit),
8390 Selector_Name => Make_Identifier (Loc, Name_uSize)));
8394 New_Reference_To (Storage_Size_Variable (Ttyp), Loc));
8397 -- Task_Info parameter. Set to Unspecified_Task_Info unless there is a
8398 -- Task_Info pragma, in which case we take the value from the pragma.
8401 and then Has_Task_Info_Pragma (Tdef)
8404 Make_Selected_Component (Loc,
8405 Prefix => Make_Identifier (Loc, Name_uInit),
8406 Selector_Name => Make_Identifier (Loc, Name_uTask_Info)));
8410 New_Reference_To (RTE (RE_Unspecified_Task_Info), Loc));
8413 if not Restricted_Profile then
8415 -- Number of entries. This is an expression of the form:
8417 -- n + _Init.a'Length + _Init.a'B'Length + ...
8419 -- where a,b... are the entry family names for the task definition
8421 Ecount := Build_Entry_Count_Expression (
8423 Component_Items (Component_List (
8424 Type_Definition (Parent (
8425 Corresponding_Record_Type (Ttyp))))),
8427 Append_To (Args, Ecount);
8429 -- Master parameter. This is a reference to the _Master parameter of
8430 -- the initialization procedure, except in the case of the pragma
8431 -- Restrictions (No_Task_Hierarchy) where the value is fixed to 3.
8432 -- See comments in System.Tasking.Initialization.Init_RTS for the
8435 if Restriction_Active (No_Task_Hierarchy) = False then
8436 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
8438 Append_To (Args, Make_Integer_Literal (Loc, 3));
8442 -- State parameter. This is a pointer to the task body procedure. The
8443 -- required value is obtained by taking the address of the task body
8444 -- procedure and converting it (with an unchecked conversion) to the
8445 -- type required by the task kernel. For further details, see the
8446 -- description of Expand_Task_Body
8449 Unchecked_Convert_To (RTE (RE_Task_Procedure_Access),
8450 Make_Attribute_Reference (Loc,
8452 New_Occurrence_Of (Get_Task_Body_Procedure (Ttyp), Loc),
8453 Attribute_Name => Name_Address)));
8455 -- Discriminants parameter. This is just the address of the task
8456 -- value record itself (which contains the discriminant values
8459 Make_Attribute_Reference (Loc,
8460 Prefix => Make_Identifier (Loc, Name_uInit),
8461 Attribute_Name => Name_Address));
8463 -- Elaborated parameter. This is an access to the elaboration Boolean
8466 Make_Attribute_Reference (Loc,
8467 Prefix => Make_Identifier (Loc, New_External_Name (Tnam, 'E')),
8468 Attribute_Name => Name_Unchecked_Access));
8470 -- Chain parameter. This is a reference to the _Chain parameter of
8471 -- the initialization procedure.
8473 Append_To (Args, Make_Identifier (Loc, Name_uChain));
8475 -- Task name parameter. Take this from the _Task_Id parameter to the
8476 -- init call unless there is a Task_Name pragma, in which case we take
8477 -- the value from the pragma.
8480 and then Has_Task_Name_Pragma (Tdef)
8485 Pragma_Argument_Associations (
8486 Find_Task_Or_Protected_Pragma
8487 (Tdef, Name_Task_Name))))));
8490 Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
8493 -- Created_Task parameter. This is the _Task_Id field of the task
8497 Make_Selected_Component (Loc,
8498 Prefix => Make_Identifier (Loc, Name_uInit),
8499 Selector_Name => Make_Identifier (Loc, Name_uTask_Id)));
8501 if Restricted_Profile then
8502 Name := New_Reference_To (RTE (RE_Create_Restricted_Task), Loc);
8504 Name := New_Reference_To (RTE (RE_Create_Task), Loc);
8507 return Make_Procedure_Call_Statement (Loc,
8508 Name => Name, Parameter_Associations => Args);
8509 end Make_Task_Create_Call;
8511 ------------------------------
8512 -- Next_Protected_Operation --
8513 ------------------------------
8515 function Next_Protected_Operation (N : Node_Id) return Node_Id is
8519 Next_Op := Next (N);
8521 while Present (Next_Op)
8522 and then Nkind (Next_Op) /= N_Subprogram_Body
8523 and then Nkind (Next_Op) /= N_Entry_Body
8529 end Next_Protected_Operation;
8531 ----------------------
8532 -- Set_Discriminals --
8533 ----------------------
8535 procedure Set_Discriminals (Dec : Node_Id) is
8538 D_Minal : Entity_Id;
8541 pragma Assert (Nkind (Dec) = N_Protected_Type_Declaration);
8542 Pdef := Defining_Identifier (Dec);
8544 if Has_Discriminants (Pdef) then
8545 D := First_Discriminant (Pdef);
8547 while Present (D) loop
8549 Make_Defining_Identifier (Sloc (D),
8550 Chars => New_External_Name (Chars (D), 'D'));
8552 Set_Ekind (D_Minal, E_Constant);
8553 Set_Etype (D_Minal, Etype (D));
8554 Set_Scope (D_Minal, Pdef);
8555 Set_Discriminal (D, D_Minal);
8556 Set_Discriminal_Link (D_Minal, D);
8558 Next_Discriminant (D);
8561 end Set_Discriminals;
8567 procedure Set_Privals
8576 Body_Ent : Entity_Id;
8577 Prec_Decl : constant Node_Id :=
8578 Parent (Corresponding_Record_Type
8579 (Defining_Identifier (Dec)));
8580 Prec_Def : constant Entity_Id := Type_Definition (Prec_Decl);
8582 P_Subtype : Entity_Id;
8583 Assoc_L : constant Elist_Id := New_Elmt_List;
8587 pragma Assert (Nkind (Dec) = N_Protected_Type_Declaration);
8589 (Nkind (Op) = N_Subprogram_Body or else Nkind (Op) = N_Entry_Body);
8591 Def := Protected_Definition (Dec);
8593 if Present (Private_Declarations (Def)) then
8595 P_Decl := First (Private_Declarations (Def));
8597 while Present (P_Decl) loop
8598 if Nkind (P_Decl) = N_Component_Declaration then
8599 P_Id := Defining_Identifier (P_Decl);
8601 Make_Defining_Identifier (Loc,
8602 New_External_Name (Chars (P_Id), 'P'));
8604 Set_Ekind (Priv, E_Variable);
8605 Set_Etype (Priv, Etype (P_Id));
8606 Set_Scope (Priv, Scope (P_Id));
8607 Set_Esize (Priv, Esize (Etype (P_Id)));
8608 Set_Alignment (Priv, Alignment (Etype (P_Id)));
8610 -- If the type of the component is an itype, we must
8611 -- create a new itype for the corresponding prival in
8612 -- each protected operation, to avoid scoping problems.
8613 -- We create new itypes by copying the tree for the
8614 -- component definition.
8616 if Is_Itype (Etype (P_Id)) then
8617 Append_Elmt (P_Id, Assoc_L);
8618 Append_Elmt (Priv, Assoc_L);
8620 if Nkind (Op) = N_Entry_Body then
8621 Op_Id := Defining_Identifier (Op);
8623 Op_Id := Defining_Unit_Name (Specification (Op));
8627 (New_Copy_Tree (P_Decl, Assoc_L, New_Scope => Op_Id));
8630 Set_Protected_Operation (P_Id, Op);
8631 Set_Prival (P_Id, Priv);
8638 -- There is one more implicit private declaration: the object
8639 -- itself. A "prival" for this is attached to the protected
8640 -- body defining identifier.
8642 Body_Ent := Corresponding_Body (Dec);
8645 Make_Defining_Identifier (Sloc (Body_Ent),
8646 Chars => New_External_Name (Chars (Body_Ent), 'R'));
8648 -- Set the Etype to the implicit subtype of Protection created when
8649 -- the protected type declaration was expanded. This node will not
8650 -- be analyzed until it is used as the defining identifier for the
8651 -- renaming declaration in the protected operation body, and it will
8652 -- be needed in the references expanded before that body is expanded.
8653 -- Since the Protection field is aliased, set Is_Aliased as well.
8655 Obj_Decl := First (Component_Items (Component_List (Prec_Def)));
8656 while Chars (Defining_Identifier (Obj_Decl)) /= Name_uObject loop
8660 P_Subtype := Etype (Defining_Identifier (Obj_Decl));
8661 Set_Etype (Priv, P_Subtype);
8662 Set_Is_Aliased (Priv);
8663 Set_Object_Ref (Body_Ent, Priv);
8666 ----------------------------
8667 -- Update_Prival_Subtypes --
8668 ----------------------------
8670 procedure Update_Prival_Subtypes (N : Node_Id) is
8672 function Process (N : Node_Id) return Traverse_Result;
8673 -- Update the etype of occurrences of privals whose etype does not
8674 -- match the current Etype of the prival entity itself.
8676 procedure Update_Array_Bounds (E : Entity_Id);
8677 -- Itypes generated for array expressions may depend on the
8678 -- determinants of the protected object, and need to be processed
8679 -- separately because they are not attached to the tree.
8681 procedure Update_Index_Types (N : Node_Id);
8682 -- Similarly, update the types of expressions in indexed components
8683 -- which may depend on other discriminants.
8689 function Process (N : Node_Id) return Traverse_Result is
8691 if Is_Entity_Name (N) then
8693 E : constant Entity_Id := Entity (N);
8697 and then (Ekind (E) = E_Constant
8698 or else Ekind (E) = E_Variable)
8699 and then Nkind (Parent (E)) = N_Object_Renaming_Declaration
8700 and then not Is_Scalar_Type (Etype (E))
8701 and then Etype (N) /= Etype (E)
8703 Set_Etype (N, Etype (Entity (Original_Node (N))));
8704 Update_Index_Types (N);
8707 and then Ekind (E) = E_Constant
8708 and then Present (Discriminal_Link (E))
8710 Set_Etype (N, Etype (E));
8716 elsif Nkind (N) = N_Defining_Identifier
8717 or else Nkind (N) = N_Defining_Operator_Symbol
8718 or else Nkind (N) = N_Defining_Character_Literal
8722 elsif Nkind (N) = N_String_Literal then
8723 -- array type, but bounds are constant.
8726 elsif Nkind (N) = N_Object_Declaration
8727 and then Is_Itype (Etype (Defining_Identifier (N)))
8728 and then Is_Array_Type (Etype (Defining_Identifier (N)))
8730 Update_Array_Bounds (Etype (Defining_Identifier (N)));
8733 -- For array components of discriminated records, use the
8734 -- base type directly, because it may depend indirectly
8735 -- on the discriminants of the protected type. Cleaner would
8736 -- be a systematic mechanism to compute actual subtypes of
8737 -- private components ???
8739 elsif Nkind (N) in N_Has_Etype
8740 and then Present (Etype (N))
8741 and then Is_Array_Type (Etype (N))
8742 and then Nkind (N) = N_Selected_Component
8743 and then Has_Discriminants (Etype (Prefix (N)))
8745 Set_Etype (N, Base_Type (Etype (N)));
8746 Update_Index_Types (N);
8750 if Nkind (N) in N_Has_Etype
8751 and then Present (Etype (N))
8752 and then Is_Itype (Etype (N)) then
8754 if Is_Array_Type (Etype (N)) then
8755 Update_Array_Bounds (Etype (N));
8757 elsif Is_Scalar_Type (Etype (N)) then
8758 Update_Prival_Subtypes (Type_Low_Bound (Etype (N)));
8759 Update_Prival_Subtypes (Type_High_Bound (Etype (N)));
8767 -------------------------
8768 -- Update_Array_Bounds --
8769 -------------------------
8771 procedure Update_Array_Bounds (E : Entity_Id) is
8775 Ind := First_Index (E);
8777 while Present (Ind) loop
8778 Update_Prival_Subtypes (Type_Low_Bound (Etype (Ind)));
8779 Update_Prival_Subtypes (Type_High_Bound (Etype (Ind)));
8782 end Update_Array_Bounds;
8784 ------------------------
8785 -- Update_Index_Types --
8786 ------------------------
8788 procedure Update_Index_Types (N : Node_Id) is
8792 -- If the prefix has an actual subtype that is different
8793 -- from the nominal one, update the types of the indices,
8794 -- so that the proper constraints are applied. Do not
8795 -- apply this transformation to a packed array, where the
8796 -- index type is computed for a byte array and is different
8797 -- from the source index.
8799 if Nkind (Parent (N)) = N_Indexed_Component
8801 not Is_Bit_Packed_Array (Etype (Prefix (Parent (N))))
8803 Indx1 := First (Expressions (Parent (N)));
8804 I_Typ := First_Index (Etype (N));
8806 while Present (Indx1) and then Present (I_Typ) loop
8808 if not Is_Entity_Name (Indx1) then
8809 Set_Etype (Indx1, Base_Type (Etype (I_Typ)));
8816 end Update_Index_Types;
8818 procedure Traverse is new Traverse_Proc;
8820 -- Start of processing for Update_Prival_Subtypes
8824 end Update_Prival_Subtypes;