1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Casing; use Casing;
28 with Csets; use Csets;
29 with Debug; use Debug;
30 with Einfo; use Einfo;
31 with Elists; use Elists;
32 with Errout; use Errout;
33 with Exp_Dist; use Exp_Dist;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
37 with Lib.Load; use Lib.Load;
38 with Namet; use Namet;
39 with Nlists; use Nlists;
40 with Nmake; use Nmake;
41 with Output; use Output;
43 with Restrict; use Restrict;
45 with Sem_Ch7; use Sem_Ch7;
46 with Sem_Dist; use Sem_Dist;
47 with Sem_Util; use Sem_Util;
48 with Sinfo; use Sinfo;
49 with Stand; use Stand;
50 with Snames; use Snames;
51 with Tbuild; use Tbuild;
52 with Uname; use Uname;
54 package body Rtsfind is
56 RTE_Available_Call : Boolean := False;
57 -- Set True during call to RTE from RTE_Available (or from call to
58 -- RTE_Record_Component from RTE_Record_Component_Available). Tells
59 -- the called subprogram to set RTE_Is_Available to False rather than
60 -- generating an error message.
62 RTE_Is_Available : Boolean;
63 -- Set True by RTE_Available on entry. When RTE_Available_Call is set
64 -- True, set False if RTE would otherwise generate an error message.
70 -- The unit table has one entry for each unit included in the definition
71 -- of the type RTU_Id in the spec. The table entries are initialized in
72 -- Initialize to set the Entity field to Empty, indicating that the
73 -- corresponding unit has not yet been loaded. The fields are set when
74 -- a unit is loaded to contain the defining entity for the unit, the
75 -- unit name, and the unit number.
77 -- Note that a unit can be loaded either by a call to find an entity
78 -- within the unit (e.g. RTE), or by an explicit with of the unit. In
79 -- the latter case it is critical to make a call to Set_RTU_Loaded to
80 -- ensure that the entry in this table reflects the load.
82 type RT_Unit_Table_Record is record
84 Uname : Unit_Name_Type;
85 Unum : Unit_Number_Type;
89 RT_Unit_Table : array (RTU_Id) of RT_Unit_Table_Record;
91 --------------------------
92 -- Runtime Entity Table --
93 --------------------------
95 -- There is one entry in the runtime entity table for each entity that is
96 -- included in the definition of the RE_Id type in the spec. The entries
97 -- are set by Initialize_Rtsfind to contain Empty, indicating that the
98 -- entity has not yet been located. Once the entity is located for the
99 -- first time, its ID is stored in this array, so that subsequent calls
100 -- for the same entity can be satisfied immediately.
102 -- NOTE: In order to avoid conflicts between record components and subprgs
103 -- that have the same name (ie. subprogram External_Tag and component
104 -- External_Tag of package Ada.Tags) this table is not used with
105 -- Record_Components.
107 RE_Table : array (RE_Id) of Entity_Id;
109 --------------------------
110 -- Generation of WITH's --
111 --------------------------
113 -- When a unit is implicitly loaded as a result of a call to RTE, it is
114 -- necessary to create an implicit WITH to ensure that the object is
115 -- correctly loaded by the binder. Such WITH statements are only required
116 -- when the request is from the extended main unit (if a client needs a
117 -- WITH, that will be taken care of when the client is compiled).
119 -- We always attach the WITH to the main unit. This is not perfectly
120 -- accurate in terms of elaboration requirements, but it is close enough,
121 -- since the units that are accessed using rtsfind do not have delicate
122 -- elaboration requirements.
124 -- The flag Withed in the unit table record is initially set to False. It
125 -- is set True if a WITH has been generated for the main unit for the
126 -- corresponding unit.
128 -----------------------
129 -- Local Subprograms --
130 -----------------------
132 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id;
133 -- Check entity Eid to ensure that configurable run-time restrictions are
134 -- met. May generate an error message (if RTE_Available_Call is false) and
135 -- raise RE_Not_Available if entity E does not exist (e.g. Eid is Empty).
136 -- Above documentation not clear ???
138 procedure Entity_Not_Defined (Id : RE_Id);
139 -- Outputs error messages for an entity that is not defined in the run-time
140 -- library (the form of the error message is tailored for no run time or
141 -- configurable run time mode as required).
143 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type;
144 -- Retrieves the Unit Name given a unit id represented by its enumeration
147 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id);
148 -- Internal procedure called if we can't sucessfully locate or process a
149 -- run-time unit. The parameters give information about the error message
150 -- to be given. S is a reason for failing to compile the file and U_Id is
151 -- the unit id. RE_Id is the RE_Id originally passed to RTE. The message in
152 -- S is one of the following:
155 -- "had parser errors"
156 -- "had semantic errors"
158 -- The "not found" case is treated specially in that it is considered
159 -- a normal situation in configurable run-time mode (and the message in
160 -- this case is suppressed unless we are operating in All_Errors_Mode).
164 Id : RE_Id := RE_Null;
165 Use_Setting : Boolean := False);
166 -- Load the unit whose Id is given if not already loaded. The unit is
167 -- loaded, analyzed, and added to the WITH list, and the entry in
168 -- RT_Unit_Table is updated to reflect the load. Use_Setting is used to
169 -- indicate the initial setting for the Is_Potentially_Use_Visible flag of
170 -- the entity for the loaded unit (if it is indeed loaded). A value of
171 -- False means nothing special need be done. A value of True indicates that
172 -- this flag must be set to True. It is needed only in the Text_IO_Kludge
173 -- procedure, which may materialize an entity of Text_IO (or
174 -- [Wide_]Wide_Text_IO) that was previously unknown. Id is the RE_Id value
175 -- of the entity which was originally requested. Id is used only for error
176 -- message detail, and if it is RE_Null, then the attempt to output the
177 -- entity name is ignored.
179 function Make_Unit_Name (E : RE_Id; N : Node_Id) return Node_Id;
180 -- If the unit is a child unit, build fully qualified name for use in
183 procedure Output_Entity_Name (Id : RE_Id; Msg : String);
184 -- Output continuation error message giving qualified name of entity
185 -- corresponding to Id, appending the string given by Msg. This call
186 -- is only effective in All_Errors mode.
188 function RE_Chars (E : RE_Id) return Name_Id;
189 -- Given a RE_Id value returns the Chars of the corresponding entity
191 procedure RTE_Error_Msg (Msg : String);
192 -- Generates a message by calling Error_Msg_N specifying Current_Error_Node
193 -- as the node location using the given Msg text. Special processing in the
194 -- case where RTE_Available_Call is set. In this case, no message is output
195 -- and instead RTE_Is_Available is set to False. Note that this can only be
196 -- used if you are sure that the message comes directly or indirectly from
197 -- a call to the RTE function.
203 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id is
204 U_Id : constant RTU_Id := RE_Unit_Table (E);
208 if RTE_Available_Call then
209 RTE_Is_Available := False;
211 Entity_Not_Defined (E);
214 raise RE_Not_Available;
216 -- Entity is available
219 -- If in No_Run_Time mode and entity is not in one of the
220 -- specially permitted units, raise the exception.
223 and then not OK_No_Run_Time_Unit (U_Id)
225 Entity_Not_Defined (E);
226 raise RE_Not_Available;
229 -- Otherwise entity is accessible
235 ------------------------
236 -- Entity_Not_Defined --
237 ------------------------
239 procedure Entity_Not_Defined (Id : RE_Id) is
241 if No_Run_Time_Mode then
243 -- If the error occurs when compiling the body of a predefined
244 -- unit for inlining purposes, the body must be illegal in this
245 -- mode, and there is no point in continuing.
247 if Is_Predefined_File_Name
248 (Unit_File_Name (Get_Source_Unit (Sloc (Current_Error_Node))))
251 ("construct not allowed in no run time mode!",
253 raise Unrecoverable_Error;
256 RTE_Error_Msg ("|construct not allowed in no run time mode");
259 elsif Configurable_Run_Time_Mode then
260 RTE_Error_Msg ("|construct not allowed in this configuration>");
262 RTE_Error_Msg ("run-time configuration error");
265 Output_Entity_Name (Id, "not defined");
266 end Entity_Not_Defined;
272 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is
273 Uname_Chars : constant String := RTU_Id'Image (U_Id);
276 Name_Len := Uname_Chars'Length;
277 Name_Buffer (1 .. Name_Len) := Uname_Chars;
278 Set_Casing (All_Lower_Case);
280 if U_Id in Ada_Child then
281 Name_Buffer (4) := '.';
283 if U_Id in Ada_Calendar_Child then
284 Name_Buffer (13) := '.';
286 elsif U_Id in Ada_Finalization_Child then
287 Name_Buffer (17) := '.';
289 elsif U_Id in Ada_Interrupts_Child then
290 Name_Buffer (15) := '.';
292 elsif U_Id in Ada_Real_Time_Child then
293 Name_Buffer (14) := '.';
295 elsif U_Id in Ada_Streams_Child then
296 Name_Buffer (12) := '.';
298 elsif U_Id in Ada_Text_IO_Child then
299 Name_Buffer (12) := '.';
301 elsif U_Id in Ada_Wide_Text_IO_Child then
302 Name_Buffer (17) := '.';
304 elsif U_Id in Ada_Wide_Wide_Text_IO_Child then
305 Name_Buffer (22) := '.';
308 elsif U_Id in Interfaces_Child then
309 Name_Buffer (11) := '.';
311 elsif U_Id in System_Child then
312 Name_Buffer (7) := '.';
314 if U_Id in System_Tasking_Child then
315 Name_Buffer (15) := '.';
318 if U_Id in System_Tasking_Restricted_Child then
319 Name_Buffer (26) := '.';
322 if U_Id in System_Tasking_Protected_Objects_Child then
323 Name_Buffer (33) := '.';
326 if U_Id in System_Tasking_Async_Delays_Child then
327 Name_Buffer (28) := '.';
331 -- Add %s at end for spec
333 Name_Buffer (Name_Len + 1) := '%';
334 Name_Buffer (Name_Len + 2) := 's';
335 Name_Len := Name_Len + 2;
344 procedure Initialize is
346 -- Initialize the unit table
349 RT_Unit_Table (J).Entity := Empty;
353 RE_Table (J) := Empty;
356 RTE_Is_Available := False;
363 function Is_RTE (Ent : Entity_Id; E : RE_Id) return Boolean is
364 E_Unit_Name : Unit_Name_Type;
365 Ent_Unit_Name : Unit_Name_Type;
375 -- If E has already a corresponding entity, check it directly,
376 -- going to full views if they exist to deal with the incomplete
377 -- and private type cases properly.
379 elsif Present (RE_Table (E)) then
382 if Is_Type (E1) and then Present (Full_View (E1)) then
383 E1 := Full_View (E1);
388 if Is_Type (E2) and then Present (Full_View (E2)) then
389 E2 := Full_View (E2);
395 -- If the unit containing E is not loaded, we already know that
396 -- the entity we have cannot have come from this unit.
398 E_Unit_Name := Get_Unit_Name (RE_Unit_Table (E));
400 if not Is_Loaded (E_Unit_Name) then
404 -- Here the unit containing the entity is loaded. We have not made
405 -- an explicit call to RTE to get the entity in question, but we may
406 -- have obtained a reference to it indirectly from some other entity
407 -- in the same unit, or some other unit that references it.
409 -- Get the defining unit of the entity
413 if Ekind (S) /= E_Package then
417 Ent_Unit_Name := Get_Unit_Name (Unit_Declaration_Node (S));
419 -- If the defining unit of the entity we are testing is not the
420 -- unit containing E, then they cannot possibly match.
422 if Ent_Unit_Name /= E_Unit_Name then
426 -- If the units match, then compare the names (remember that no
427 -- overloading is permitted in entities fetched using Rtsfind).
429 if RE_Chars (E) = Chars (Ent) then
432 -- If front-end inlining is enabled, we may be within a body that
433 -- contains inlined functions, which has not been retrieved through
434 -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table.
435 -- Add the unit information now, it must be fully available.
438 U : RT_Unit_Table_Record
439 renames RT_Unit_Table (RE_Unit_Table (E));
441 if No (U.Entity) then
443 U.Uname := E_Unit_Name;
444 U.Unum := Get_Source_Unit (S);
458 function Is_RTU (Ent : Entity_Id; U : RTU_Id) return Boolean is
459 E : constant Entity_Id := RT_Unit_Table (U).Entity;
461 return Present (E) and then E = Ent;
464 ----------------------------
465 -- Is_Text_IO_Kludge_Unit --
466 ----------------------------
468 function Is_Text_IO_Kludge_Unit (Nam : Node_Id) return Boolean is
473 if Nkind (Nam) /= N_Expanded_Name then
478 Sel := Selector_Name (Nam);
480 if Nkind (Sel) /= N_Expanded_Name
481 or else Nkind (Prf) /= N_Identifier
482 or else Chars (Prf) /= Name_Ada
488 Sel := Selector_Name (Sel);
491 Nkind (Prf) = N_Identifier
493 (Chars (Prf) = Name_Text_IO
495 Chars (Prf) = Name_Wide_Text_IO
497 Chars (Prf) = Name_Wide_Wide_Text_IO)
499 Nkind (Sel) = N_Identifier
501 Chars (Sel) in Text_IO_Package_Name;
502 end Is_Text_IO_Kludge_Unit;
508 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id) is
509 M : String (1 .. 100);
513 -- Output header message
515 if Configurable_Run_Time_Mode then
516 RTE_Error_Msg ("construct not allowed in configurable run-time mode");
518 RTE_Error_Msg ("run-time library configuration error");
521 -- Output file name and reason string
524 or else not Configurable_Run_Time_Mode
525 or else All_Errors_Mode
527 M (1 .. 6) := "\file ";
531 (Get_File_Name (RT_Unit_Table (U_Id).Uname, Subunit => False));
532 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
538 M (P + 1 .. P + S'Length) := S;
541 RTE_Error_Msg (M (1 .. P));
543 -- Output entity name
545 Output_Entity_Name (Id, "not available");
548 -- In configurable run time mode, we raise RE_Not_Available, and the
549 -- caller is expected to deal gracefully with this. In the case of a
550 -- call to RTE_Available, this exception will be caught in Rtsfind,
551 -- and result in a returned value of False for the call.
553 if Configurable_Run_Time_Mode then
554 raise RE_Not_Available;
556 -- Here we have a load failure in normal full run time mode. See if we
557 -- are in the context of an RTE_Available call. If so, we just raise
558 -- RE_Not_Available. This can happen if a unit is unavailable, which
559 -- happens for example in the VM case, where the run-time is not
560 -- complete, but we do not regard it as a configurable run-time.
561 -- If the caller has done an explicit call to RTE_Available, then
562 -- clearly the caller is prepared to deal with a result of False.
564 elsif RTE_Available_Call then
565 RTE_Is_Available := False;
566 raise RE_Not_Available;
568 -- If we are not in the context of an RTE_Available call, we are really
569 -- trying to load an entity that is not there, and that should never
570 -- happen, so in this case we signal a fatal error.
573 raise Unrecoverable_Error;
583 Id : RE_Id := RE_Null;
584 Use_Setting : Boolean := False)
586 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
587 Priv_Par : constant Elist_Id := New_Elmt_List;
590 procedure Save_Private_Visibility;
591 -- If the current unit is the body of child unit or the spec of a
592 -- private child unit, the private declarations of the parent (s)
593 -- are visible. If the unit to be loaded is another public sibling,
594 -- its compilation will affect the visibility of the common ancestors.
595 -- Indicate those that must be restored.
597 procedure Restore_Private_Visibility;
598 -- Restore the visibility of ancestors after compiling RTU
600 --------------------------------
601 -- Restore_Private_Visibility --
602 --------------------------------
604 procedure Restore_Private_Visibility is
608 E_Par := First_Elmt (Priv_Par);
609 while Present (E_Par) loop
610 if not In_Private_Part (Node (E_Par)) then
611 Install_Private_Declarations (Node (E_Par));
616 end Restore_Private_Visibility;
618 -----------------------------
619 -- Save_Private_Visibility --
620 -----------------------------
622 procedure Save_Private_Visibility is
626 Par := Scope (Current_Scope);
628 and then Par /= Standard_Standard
630 if Ekind (Par) = E_Package
631 and then Is_Compilation_Unit (Par)
632 and then In_Private_Part (Par)
634 Append_Elmt (Par, Priv_Par);
639 end Save_Private_Visibility;
641 -- Start of processing for Load_RTU
644 -- Nothing to do if unit is already loaded
646 if Present (U.Entity) then
650 -- Note if secondary stack is used
652 if U_Id = System_Secondary_Stack then
653 Opt.Sec_Stack_Used := True;
656 -- Otherwise we need to load the unit, First build unit name
657 -- from the enumeration literal name in type RTU_Id.
659 U.Uname := Get_Unit_Name (U_Id);
664 pragma Warnings (Off, Loaded);
666 Loaded := Is_Loaded (U.Uname);
669 -- Now do the load call, note that setting Error_Node to Empty is
670 -- a signal to Load_Unit that we will regard a failure to find the
671 -- file as a fatal error, and that it should not output any kind
672 -- of diagnostics, since we will take care of it here.
674 -- We save style checking switches and turn off style checking for
675 -- loading the unit, since we don't want any style checking!
678 Save_Style_Check : constant Boolean := Style_Check;
680 Style_Check := False;
683 (Load_Name => U.Uname,
686 Error_Node => Empty);
687 Style_Check := Save_Style_Check;
690 -- Check for bad unit load
692 if U.Unum = No_Unit then
693 Load_Fail ("not found", U_Id, Id);
694 elsif Fatal_Error (U.Unum) then
695 Load_Fail ("had parser errors", U_Id, Id);
698 -- Make sure that the unit is analyzed
701 Was_Analyzed : constant Boolean :=
702 Analyzed (Cunit (Current_Sem_Unit));
705 -- Pretend that the current unit is analyzed, in case it is System
706 -- or some such. This allows us to put some declarations, such as
707 -- exceptions and packed arrays of Boolean, into System even though
708 -- expanding them requires System...
710 -- This is a bit odd but works fine. If the RTS unit does not depend
711 -- in any way on the current unit, then it never gets back into the
712 -- current unit's tree, and the change we make to the current unit
713 -- tree is never noticed by anyone (it is undone in a moment). That
714 -- is the normal situation.
716 -- If the RTS Unit *does* depend on the current unit, for instance,
717 -- when you are compiling System, then you had better have finished
718 -- analyzing the part of System that is depended on before you try
719 -- to load the RTS Unit. This means having the System ordered in an
720 -- appropriate manner.
722 Set_Analyzed (Cunit (Current_Sem_Unit), True);
724 if not Analyzed (Cunit (U.Unum)) then
726 -- If the unit is already loaded through a limited_with clauses,
727 -- the relevant entities must already be available. We do not
728 -- want to load and analyze the unit because this would create
729 -- a real semantic dependence when the purpose of the limited_with
730 -- is precisely to avoid such.
732 if From_With_Type (Cunit_Entity (U.Unum)) then
736 Save_Private_Visibility;
737 Semantics (Cunit (U.Unum));
738 Restore_Private_Visibility;
740 if Fatal_Error (U.Unum) then
741 Load_Fail ("had semantic errors", U_Id, Id);
748 Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed);
751 Lib_Unit := Unit (Cunit (U.Unum));
752 U.Entity := Defining_Entity (Lib_Unit);
755 Set_Is_Potentially_Use_Visible (U.Entity, True);
763 function Make_Unit_Name (E : RE_Id; N : Node_Id) return Node_Id is
764 U_Id : constant RTU_Id := RE_Unit_Table (E);
765 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
770 Nam := New_Reference_To (U.Entity, Standard_Location);
771 Scop := Scope (U.Entity);
773 if Nkind (N) = N_Defining_Program_Unit_Name then
774 while Scop /= Standard_Standard loop
776 Make_Expanded_Name (Standard_Location,
777 Chars => Chars (U.Entity),
778 Prefix => New_Reference_To (Scop, Standard_Location),
779 Selector_Name => Nam);
780 Set_Entity (Nam, U.Entity);
782 Scop := Scope (Scop);
789 -----------------------
790 -- Output_Entity_Name --
791 ------------------------
793 procedure Output_Entity_Name (Id : RE_Id; Msg : String) is
794 M : String (1 .. 2048);
796 -- M (1 .. P) is current message to be output
798 RE_Image : constant String := RE_Id'Image (Id);
801 if Id = RE_Null or else not All_Errors_Mode then
805 M (1 .. 9) := "\entity """;
808 -- Add unit name to message, excluding %s or %b at end
810 Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id)));
811 Name_Len := Name_Len - 2;
812 Set_Casing (Mixed_Case);
813 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
816 -- Add a qualifying period
821 -- Add entity name and closing quote to message
823 Name_Len := RE_Image'Length - 3;
824 Name_Buffer (1 .. Name_Len) := RE_Image (4 .. RE_Image'Length);
825 Set_Casing (Mixed_Case);
826 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
835 M (P + 1 .. P + Msg'Length) := Msg;
838 -- Output message at current error node location
840 RTE_Error_Msg (M (1 .. P));
841 end Output_Entity_Name;
847 function RE_Chars (E : RE_Id) return Name_Id is
848 RE_Name_Chars : constant String := RE_Id'Image (E);
851 -- Copy name skipping initial RE_ or RO_XX characters
853 if RE_Name_Chars (1 .. 2) = "RE" then
854 for J in 4 .. RE_Name_Chars'Last loop
855 Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J));
858 Name_Len := RE_Name_Chars'Length - 3;
861 for J in 7 .. RE_Name_Chars'Last loop
862 Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J));
865 Name_Len := RE_Name_Chars'Length - 6;
875 function RTE (E : RE_Id) return Entity_Id is
876 U_Id : constant RTU_Id := RE_Unit_Table (E);
877 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
883 -- The following flag is used to disable front-end inlining when RTE
884 -- is invoked. This prevents the analysis of other runtime bodies when
885 -- a particular spec is loaded through Rtsfind. This is both efficient,
886 -- and it prevents spurious visibility conflicts between use-visible
887 -- user entities, and entities in run-time packages.
889 -- In configurable run-time mode, subprograms marked Inline_Always must
890 -- be inlined, so in the case we retain the Front_End_Inlining mode.
892 Save_Front_End_Inlining : Boolean;
895 -- Reject programs that make use of distribution features not supported
896 -- on the current target. Also check that the PCS is compatible with
897 -- the code generator version. On such targets (VMS, Vxworks, others?)
898 -- we provide a minimal body for System.Rpc that only supplies an
899 -- implementation of Partition_Id.
901 function Find_Local_Entity (E : RE_Id) return Entity_Id;
902 -- This function is used when entity E is in this compilation's main
903 -- unit. It gets the value from the already compiled declaration.
909 procedure Check_RPC is
911 procedure Check_RPC_Failure (Msg : String);
912 pragma No_Return (Check_RPC_Failure);
913 -- Display Msg on standard error and raise Unrecoverable_Error
915 -----------------------
916 -- Check_RPC_Failure --
917 -----------------------
919 procedure Check_RPC_Failure (Msg : String) is
924 raise Unrecoverable_Error;
925 end Check_RPC_Failure;
927 -- Start of processing for Check_RPC
930 -- Bypass this check if debug flag -gnatdR set
932 if Debug_Flag_RR then
936 -- Otherwise we need the check if we are going after one of
937 -- the critical entities in System.RPC in stubs mode.
939 -- ??? Should we do this for other s-parint entities too?
941 if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
943 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
944 and then (E = RE_Do_Rpc
948 E = RE_Params_Stream_Type
950 E = RE_Request_Access)
952 if Get_PCS_Name = Name_No_DSA then
953 Check_RPC_Failure ("distribution feature not supported");
955 elsif Get_PCS_Version /= Exp_Dist.PCS_Version_Number then
956 Check_RPC_Failure ("PCS version mismatch");
962 -----------------------
963 -- Find_Local_Entity --
964 -----------------------
966 function Find_Local_Entity (E : RE_Id) return Entity_Id is
967 RE_Str : constant String := RE_Id'Image (E);
971 Save_Nam : constant String := Name_Buffer (1 .. Name_Len);
972 -- Save name buffer and length over call
975 Name_Len := Natural'Max (0, RE_Str'Length - 3);
976 Name_Buffer (1 .. Name_Len) :=
977 RE_Str (RE_Str'First + 3 .. RE_Str'Last);
980 Ent := Entity_Id (Get_Name_Table_Info (Nam));
982 Name_Len := Save_Nam'Length;
983 Name_Buffer (1 .. Name_Len) := Save_Nam;
986 end Find_Local_Entity;
988 -- Start of processing for RTE
991 -- Doing a rtsfind in system.ads is special, as we cannot do this
992 -- when compiling System itself. So if we are compiling system then
993 -- we should already have acquired and processed the declaration
994 -- of the entity. The test is to see if this compilation's main unit
995 -- is System. If so, return the value from the already compiled
996 -- declaration and otherwise do a regular find.
998 -- Not pleasant, but these kinds of annoying recursion when
999 -- writing an Ada compiler in Ada have to be broken somewhere!
1001 if Present (Main_Unit_Entity)
1002 and then Chars (Main_Unit_Entity) = Name_System
1003 and then Analyzed (Main_Unit_Entity)
1004 and then not Is_Child_Unit (Main_Unit_Entity)
1006 return Check_CRT (E, Find_Local_Entity (E));
1009 Save_Front_End_Inlining := Front_End_Inlining;
1010 Front_End_Inlining := Configurable_Run_Time_Mode;
1012 -- Load unit if unit not previously loaded
1014 if No (RE_Table (E)) then
1015 Load_RTU (U_Id, Id => E);
1016 Lib_Unit := Unit (Cunit (U.Unum));
1018 -- In the subprogram case, we are all done, the entity we want
1019 -- is the entity for the subprogram itself. Note that we do not
1020 -- bother to check that it is the entity that was requested.
1021 -- the only way that could fail to be the case is if runtime is
1022 -- hopelessly misconfigured, and it isn't worth testing for this.
1024 if Nkind (Lib_Unit) = N_Subprogram_Declaration then
1025 RE_Table (E) := U.Entity;
1027 -- Otherwise we must have the package case. First check package
1028 -- entity itself (e.g. RTE_Name for System.Interrupts.Name)
1031 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration);
1032 Ename := RE_Chars (E);
1034 -- First we search the package entity chain. If the package
1035 -- only has a limited view, scan the corresponding list of
1036 -- incomplete types.
1038 if From_With_Type (U.Entity) then
1039 Pkg_Ent := First_Entity (Limited_View (U.Entity));
1041 Pkg_Ent := First_Entity (U.Entity);
1044 while Present (Pkg_Ent) loop
1045 if Ename = Chars (Pkg_Ent) then
1046 RE_Table (E) := Pkg_Ent;
1051 Next_Entity (Pkg_Ent);
1054 -- If we did not find the entity in the package entity chain,
1055 -- then check if the package entity itself matches. Note that
1056 -- we do this check after searching the entity chain, since
1057 -- the rule is that in case of ambiguity, we prefer the entity
1058 -- defined within the package, rather than the package itself.
1060 if Ename = Chars (U.Entity) then
1061 RE_Table (E) := U.Entity;
1064 -- If we didn't find the entity we want, something is wrong.
1065 -- We just leave RE_Table (E) set to Empty and the appropriate
1066 -- action will be taken by Check_CRT when we exit.
1071 -- See if we have to generate a WITH for this entity. We generate
1072 -- a WITH if the current unit is part of the extended main code
1073 -- unit, and if we have not already added the with. The WITH is
1074 -- added to the appropriate unit (the current one). We do not need
1075 -- to generate a WITH for a call issued from RTE_Available.
1080 In_Extended_Main_Code_Unit (Cunit_Entity (Current_Sem_Unit))
1081 and then not RTE_Available_Call
1090 Lib_Unit := Unit (Cunit (U.Unum));
1092 Make_With_Clause (Standard_Location,
1095 (E, Defining_Unit_Name (Specification (Lib_Unit))));
1096 Set_Library_Unit (Withn, Cunit (U.Unum));
1097 Set_Corresponding_Spec (Withn, U.Entity);
1098 Set_First_Name (Withn, True);
1099 Set_Implicit_With (Withn, True);
1101 Mark_Rewrite_Insertion (Withn);
1102 Append (Withn, Context_Items (Cunit (Current_Sem_Unit)));
1103 Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node);
1107 Front_End_Inlining := Save_Front_End_Inlining;
1108 return Check_CRT (E, RE_Table (E));
1115 function RTE_Available (E : RE_Id) return Boolean is
1117 pragma Warnings (Off, Dummy);
1121 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call;
1122 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available;
1123 -- These are saved recursively because the call to load a unit
1124 -- caused by an upper level call may perform a recursive call
1125 -- to this routine during analysis of the corresponding unit.
1128 RTE_Available_Call := True;
1129 RTE_Is_Available := True;
1131 Result := RTE_Is_Available;
1132 RTE_Available_Call := Save_RTE_Available_Call;
1133 RTE_Is_Available := Save_RTE_Is_Available;
1137 when RE_Not_Available =>
1138 RTE_Available_Call := Save_RTE_Available_Call;
1139 RTE_Is_Available := Save_RTE_Is_Available;
1143 --------------------------
1144 -- RTE_Record_Component --
1145 --------------------------
1147 function RTE_Record_Component (E : RE_Id) return Entity_Id is
1148 U_Id : constant RTU_Id := RE_Unit_Table (E);
1149 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
1152 Found_E : Entity_Id;
1154 Pkg_Ent : Entity_Id;
1156 -- The following flag is used to disable front-end inlining when
1157 -- RTE_Record_Component is invoked. This prevents the analysis of other
1158 -- runtime bodies when a particular spec is loaded through Rtsfind. This
1159 -- is both efficient, and it prevents spurious visibility conflicts
1160 -- between use-visible user entities, and entities in run-time packages.
1162 -- In configurable run-time mode, subprograms marked Inline_Always must
1163 -- be inlined, so in the case we retain the Front_End_Inlining mode.
1165 Save_Front_End_Inlining : Boolean;
1168 -- Note: Contrary to subprogram RTE, there is no need to do any special
1169 -- management with package system.ads because it has no record type
1172 Save_Front_End_Inlining := Front_End_Inlining;
1173 Front_End_Inlining := Configurable_Run_Time_Mode;
1175 -- Load unit if unit not previously loaded
1177 if not Present (U.Entity) then
1178 Load_RTU (U_Id, Id => E);
1181 Lib_Unit := Unit (Cunit (U.Unum));
1183 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration);
1184 Ename := RE_Chars (E);
1186 -- Search the entity in the components of record type declarations
1187 -- found in the package entity chain.
1190 Pkg_Ent := First_Entity (U.Entity);
1191 Search : while Present (Pkg_Ent) loop
1192 if Is_Record_Type (Pkg_Ent) then
1193 E1 := First_Entity (Pkg_Ent);
1194 while Present (E1) loop
1195 if Ename = Chars (E1) then
1196 pragma Assert (not Present (Found_E));
1204 Next_Entity (Pkg_Ent);
1207 -- If we didn't find the entity we want, something is wrong. The
1208 -- appropriate action will be taken by Check_CRT when we exit.
1210 -- Cenerate a with-clause if the current unit is part of the extended
1211 -- main code unit, and if we have not already added the with. The clause
1212 -- is added to the appropriate unit (the current one). We do not need to
1213 -- generate it for a call issued from RTE_Component_Available.
1217 In_Extended_Main_Code_Unit (Cunit_Entity (Current_Sem_Unit))
1218 and then not RTE_Available_Call
1227 Lib_Unit := Unit (Cunit (U.Unum));
1229 Make_With_Clause (Standard_Location,
1232 (E, Defining_Unit_Name (Specification (Lib_Unit))));
1233 Set_Library_Unit (Withn, Cunit (U.Unum));
1234 Set_Corresponding_Spec (Withn, U.Entity);
1235 Set_First_Name (Withn, True);
1236 Set_Implicit_With (Withn, True);
1238 Mark_Rewrite_Insertion (Withn);
1239 Append (Withn, Context_Items (Cunit (Current_Sem_Unit)));
1240 Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node);
1244 Front_End_Inlining := Save_Front_End_Inlining;
1245 return Check_CRT (E, Found_E);
1246 end RTE_Record_Component;
1248 ------------------------------------
1249 -- RTE_Record_Component_Available --
1250 ------------------------------------
1252 function RTE_Record_Component_Available (E : RE_Id) return Boolean is
1254 pragma Warnings (Off, Dummy);
1258 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call;
1259 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available;
1260 -- These are saved recursively because the call to load a unit
1261 -- caused by an upper level call may perform a recursive call
1262 -- to this routine during analysis of the corresponding unit.
1265 RTE_Available_Call := True;
1266 RTE_Is_Available := True;
1267 Dummy := RTE_Record_Component (E);
1268 Result := RTE_Is_Available;
1269 RTE_Available_Call := Save_RTE_Available_Call;
1270 RTE_Is_Available := Save_RTE_Is_Available;
1274 when RE_Not_Available =>
1275 RTE_Available_Call := Save_RTE_Available_Call;
1276 RTE_Is_Available := Save_RTE_Is_Available;
1278 end RTE_Record_Component_Available;
1284 procedure RTE_Error_Msg (Msg : String) is
1286 if RTE_Available_Call then
1287 RTE_Is_Available := False;
1289 Error_Msg_N (Msg, Current_Error_Node);
1291 -- Bump count of violations if we are in configurable run-time
1292 -- mode and this is not a continuation message.
1294 if Configurable_Run_Time_Mode and then Msg (Msg'First) /= '\' then
1295 Configurable_Run_Time_Violations :=
1296 Configurable_Run_Time_Violations + 1;
1305 function RTU_Entity (U : RTU_Id) return Entity_Id is
1307 return RT_Unit_Table (U).Entity;
1314 function RTU_Loaded (U : RTU_Id) return Boolean is
1316 return Present (RT_Unit_Table (U).Entity);
1319 --------------------
1320 -- Set_RTU_Loaded --
1321 --------------------
1323 procedure Set_RTU_Loaded (N : Node_Id) is
1324 Loc : constant Source_Ptr := Sloc (N);
1325 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1326 Uname : constant Unit_Name_Type := Unit_Name (Unum);
1327 E : constant Entity_Id :=
1328 Defining_Entity (Unit (Cunit (Unum)));
1330 pragma Assert (Is_Predefined_File_Name (Unit_File_Name (Unum)));
1332 -- Loop through entries in RTU table looking for matching entry
1334 for U_Id in RTU_Id'Range loop
1336 -- Here we have a match
1338 if Get_Unit_Name (U_Id) = Uname then
1340 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
1341 -- The RT_Unit_Table entry that may need updating
1344 -- If entry is not set, set it now
1346 if No (U.Entity) then
1348 U.Uname := Get_Unit_Name (U_Id);
1359 --------------------
1360 -- Text_IO_Kludge --
1361 --------------------
1363 procedure Text_IO_Kludge (Nam : Node_Id) is
1366 type Name_Map_Type is array (Text_IO_Package_Name) of RTU_Id;
1368 Name_Map : constant Name_Map_Type := Name_Map_Type'(
1369 Name_Decimal_IO => Ada_Text_IO_Decimal_IO,
1370 Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO,
1371 Name_Fixed_IO => Ada_Text_IO_Fixed_IO,
1372 Name_Float_IO => Ada_Text_IO_Float_IO,
1373 Name_Integer_IO => Ada_Text_IO_Integer_IO,
1374 Name_Modular_IO => Ada_Text_IO_Modular_IO);
1376 Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'(
1377 Name_Decimal_IO => Ada_Wide_Text_IO_Decimal_IO,
1378 Name_Enumeration_IO => Ada_Wide_Text_IO_Enumeration_IO,
1379 Name_Fixed_IO => Ada_Wide_Text_IO_Fixed_IO,
1380 Name_Float_IO => Ada_Wide_Text_IO_Float_IO,
1381 Name_Integer_IO => Ada_Wide_Text_IO_Integer_IO,
1382 Name_Modular_IO => Ada_Wide_Text_IO_Modular_IO);
1384 Wide_Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'(
1385 Name_Decimal_IO => Ada_Wide_Wide_Text_IO_Decimal_IO,
1386 Name_Enumeration_IO => Ada_Wide_Wide_Text_IO_Enumeration_IO,
1387 Name_Fixed_IO => Ada_Wide_Wide_Text_IO_Fixed_IO,
1388 Name_Float_IO => Ada_Wide_Wide_Text_IO_Float_IO,
1389 Name_Integer_IO => Ada_Wide_Wide_Text_IO_Integer_IO,
1390 Name_Modular_IO => Ada_Wide_Wide_Text_IO_Modular_IO);
1393 -- Nothing to do if name is not identifier or a selected component
1394 -- whose selector_name is not an identifier.
1396 if Nkind (Nam) = N_Identifier then
1397 Chrs := Chars (Nam);
1399 elsif Nkind (Nam) = N_Selected_Component
1400 and then Nkind (Selector_Name (Nam)) = N_Identifier
1402 Chrs := Chars (Selector_Name (Nam));
1408 -- Nothing to do if name is not one of the Text_IO subpackages
1409 -- Otherwise look through loaded units, and if we find Text_IO
1410 -- or [Wide_]Wide_Text_IO already loaded, then load the proper child.
1412 if Chrs in Text_IO_Package_Name then
1413 for U in Main_Unit .. Last_Unit loop
1414 Get_Name_String (Unit_File_Name (U));
1416 if Name_Len = 12 then
1418 -- Here is where we do the loads if we find one of the units
1419 -- Ada.Text_IO or Ada.[Wide_]Wide_Text_IO. An interesting
1420 -- detail is that these units may already be used (i.e. their
1421 -- In_Use flags may be set). Normally when the In_Use flag is
1422 -- set, the Is_Potentially_Use_Visible flag of all entities in
1423 -- the package is set, but the new entity we are mysteriously
1424 -- adding was not there to have its flag set at the time. So
1425 -- that's why we pass the extra parameter to RTU_Find, to make
1426 -- sure the flag does get set now. Given that those generic
1427 -- packages are in fact child units, we must indicate that
1428 -- they are visible.
1430 if Name_Buffer (1 .. 12) = "a-textio.ads" then
1433 Use_Setting => In_Use (Cunit_Entity (U)));
1434 Set_Is_Visible_Child_Unit
1435 (RT_Unit_Table (Name_Map (Chrs)).Entity);
1437 elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then
1439 (Wide_Name_Map (Chrs),
1440 Use_Setting => In_Use (Cunit_Entity (U)));
1441 Set_Is_Visible_Child_Unit
1442 (RT_Unit_Table (Wide_Name_Map (Chrs)).Entity);
1444 elsif Name_Buffer (1 .. 12) = "a-ztexio.ads" then
1446 (Wide_Wide_Name_Map (Chrs),
1447 Use_Setting => In_Use (Cunit_Entity (U)));
1448 Set_Is_Visible_Child_Unit
1449 (RT_Unit_Table (Wide_Wide_Name_Map (Chrs)).Entity);
1456 -- Generate error message if run-time unit not available
1458 when RE_Not_Available =>
1459 Error_Msg_N ("& not available", Nam);