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 Casing; use Casing;
29 with Csets; use Csets;
30 with Debug; use Debug;
31 with Einfo; use Einfo;
32 with Elists; use Elists;
33 with Errout; use Errout;
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;
44 with Sem_Ch7; use Sem_Ch7;
45 with Sem_Util; use Sem_Util;
46 with Sinfo; use Sinfo;
47 with Stand; use Stand;
48 with Snames; use Snames;
49 with Tbuild; use Tbuild;
50 with Uname; use Uname;
52 package body Rtsfind is
54 RTE_Available_Call : Boolean := False;
55 -- Set True during call to RTE from RTE_Available. Tells RTE to set
56 -- RTE_Is_Available to False rather than generating an error message.
58 RTE_Is_Available : Boolean;
59 -- Set True by RTE_Available on entry. When RTE_Available_Call is set
60 -- True, set False if RTE would otherwise generate an error message.
66 -- The unit table has one entry for each unit included in the definition
67 -- of the type RTU_Id in the spec. The table entries are initialized in
68 -- Initialize to set the Entity field to Empty, indicating that the
69 -- corresponding unit has not yet been loaded. The fields are set when
70 -- a unit is loaded to contain the defining entity for the unit, the
71 -- unit name, and the unit number.
73 -- Note that a unit can be loaded either by a call to find an entity
74 -- within the unit (e.g. RTE), or by an explicit with of the unit. In
75 -- the latter case it is critical to make a call to Set_RTU_Loaded to
76 -- ensure that the entry in this table reflects the load.
78 type RT_Unit_Table_Record is record
80 Uname : Unit_Name_Type;
81 Unum : Unit_Number_Type;
85 RT_Unit_Table : array (RTU_Id) of RT_Unit_Table_Record;
87 --------------------------
88 -- Runtime Entity Table --
89 --------------------------
91 -- There is one entry in the runtime entity table for each entity that is
92 -- included in the definition of the RE_Id type in the spec. The entries
93 -- are set by Initialize_Rtsfind to contain Empty, indicating that the
94 -- entity has not yet been located. Once the entity is located for the
95 -- first time, its ID is stored in this array, so that subsequent calls
96 -- for the same entity can be satisfied immediately.
98 RE_Table : array (RE_Id) of Entity_Id;
100 --------------------------
101 -- Generation of WITH's --
102 --------------------------
104 -- When a unit is implicitly loaded as a result of a call to RTE, it
105 -- is necessary to create an implicit WITH to ensure that the object
106 -- is correctly loaded by the binder. Such WITH statements are only
107 -- required when the request is from the extended main unit (if a
108 -- client needs a WITH, that will be taken care of when the client
111 -- We always attach the WITH to the main unit. This is not perfectly
112 -- accurate in terms of elaboration requirements, but it is close
113 -- enough, since the units that are accessed using rtsfind do not
114 -- have delicate elaboration requirements.
116 -- The flag Withed in the unit table record is initially set to False.
117 -- It is set True if a WITH has been generated for the main unit for
118 -- the corresponding unit.
120 -----------------------
121 -- Local Subprograms --
122 -----------------------
124 procedure Entity_Not_Defined (Id : RE_Id);
125 -- Outputs error messages for an entity that is not defined in the
126 -- run-time library (the form of the error message is tailored for
127 -- no run time/configurable run time mode as required).
129 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id);
130 -- Internal procedure called if we can't sucessfully locate or
131 -- process a run-time unit. The parameters give information about
132 -- the error message to be given. S is a reason for failing to
133 -- compile the file and U_Id is the unit id. RE_Id is the RE_Id
134 -- originally passed to RTE. The message in S is one of the
138 -- "had parser errors"
139 -- "had semantic errors"
141 -- The "not found" case is treated specially in that it is considered
142 -- a normal situation in configurable run-time mode (and the message in
143 -- this case is suppressed unless we are operating in All_Errors_Mode).
145 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type;
146 -- Retrieves the Unit Name given a unit id represented by its
147 -- enumeration value in RTU_Id.
151 Id : RE_Id := RE_Null;
152 Use_Setting : Boolean := False);
153 -- Load the unit whose Id is given if not already loaded. The unit is
154 -- loaded, analyzed, and added to the WITH list, and the entry in
155 -- RT_Unit_Table is updated to reflect the load. Use_Setting is used
156 -- to indicate the initial setting for the Is_Potentially_Use_Visible
157 -- flag of the entity for the loaded unit (if it is indeed loaded).
158 -- A value of False means nothing special need be done. A value of
159 -- True indicates that this flag must be set to True. It is needed
160 -- only in the Text_IO_Kludge procedure, which may materialize an
161 -- entity of Text_IO (or Wide_Text_IO) that was previously unknown.
162 -- Id is the RE_Id value of the entity which was originally requested.
163 -- Id is used only for error message detail, and if it is RE_Null, then
164 -- the attempt to output the entity name is ignored.
166 procedure Output_Entity_Name (Id : RE_Id; Msg : String);
167 -- Output continuation error message giving qualified name of entity
168 -- corresponding to Id, appending the string given by Msg. This call
169 -- is only effective in All_Errors mode.
171 function RE_Chars (E : RE_Id) return Name_Id;
172 -- Given a RE_Id value returns the Chars of the corresponding entity.
174 procedure RTE_Error_Msg (Msg : String);
175 -- Generates a message by calling Error_Msg_N specifying Current_Error_Node
176 -- as the node location using the given Msg text. Special processing in the
177 -- case where RTE_Available_Call is set. In this case, no message is output
178 -- and instead RTE_Is_Available is set to False. Note that this can only be
179 -- used if you are sure that the message comes directly or indirectly from
180 -- a call to the RTE function.
182 ------------------------
183 -- Entity_Not_Defined --
184 ------------------------
186 procedure Entity_Not_Defined (Id : RE_Id) is
188 if No_Run_Time_Mode then
190 -- If the error occurs when compiling the body of a predefined
191 -- unit for inlining purposes, the body must be illegal in this
192 -- mode, and there is no point in continuing.
194 if Is_Predefined_File_Name
195 (Unit_File_Name (Get_Source_Unit (Sloc (Current_Error_Node))))
198 ("construct not allowed in no run time mode!",
200 raise Unrecoverable_Error;
203 RTE_Error_Msg ("|construct not allowed in no run time mode");
206 elsif Configurable_Run_Time_Mode then
207 RTE_Error_Msg ("|construct not allowed in this configuration>");
209 RTE_Error_Msg ("run-time configuration error");
212 Output_Entity_Name (Id, "not defined");
213 end Entity_Not_Defined;
219 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is
220 Uname_Chars : constant String := RTU_Id'Image (U_Id);
223 Name_Len := Uname_Chars'Length;
224 Name_Buffer (1 .. Name_Len) := Uname_Chars;
225 Set_Casing (All_Lower_Case);
227 if U_Id in Ada_Child then
228 Name_Buffer (4) := '.';
230 if U_Id in Ada_Calendar_Child then
231 Name_Buffer (13) := '.';
233 elsif U_Id in Ada_Finalization_Child then
234 Name_Buffer (17) := '.';
236 elsif U_Id in Ada_Interrupts_Child then
237 Name_Buffer (15) := '.';
239 elsif U_Id in Ada_Real_Time_Child then
240 Name_Buffer (14) := '.';
242 elsif U_Id in Ada_Streams_Child then
243 Name_Buffer (12) := '.';
245 elsif U_Id in Ada_Text_IO_Child then
246 Name_Buffer (12) := '.';
248 elsif U_Id in Ada_Wide_Text_IO_Child then
249 Name_Buffer (17) := '.';
252 elsif U_Id in Interfaces_Child then
253 Name_Buffer (11) := '.';
255 elsif U_Id in System_Child then
256 Name_Buffer (7) := '.';
258 if U_Id in System_Tasking_Child then
259 Name_Buffer (15) := '.';
262 if U_Id in System_Tasking_Restricted_Child then
263 Name_Buffer (26) := '.';
266 if U_Id in System_Tasking_Protected_Objects_Child then
267 Name_Buffer (33) := '.';
270 if U_Id in System_Tasking_Async_Delays_Child then
271 Name_Buffer (28) := '.';
275 -- Add %s at end for spec
277 Name_Buffer (Name_Len + 1) := '%';
278 Name_Buffer (Name_Len + 2) := 's';
279 Name_Len := Name_Len + 2;
288 procedure Initialize is
290 -- Initialize the unit table
293 RT_Unit_Table (J).Entity := Empty;
297 RE_Table (J) := Empty;
300 RTE_Is_Available := False;
307 function Is_RTE (Ent : Entity_Id; E : RE_Id) return Boolean is
308 E_Unit_Name : Unit_Name_Type;
309 Ent_Unit_Name : Unit_Name_Type;
319 -- If E has already a corresponding entity, check it directly,
320 -- going to full views if they exist to deal with the incomplete
321 -- and private type cases properly.
323 elsif Present (RE_Table (E)) then
326 if Is_Type (E1) and then Present (Full_View (E1)) then
327 E1 := Full_View (E1);
332 if Is_Type (E2) and then Present (Full_View (E2)) then
333 E2 := Full_View (E2);
339 -- If the unit containing E is not loaded, we already know that
340 -- the entity we have cannot have come from this unit.
342 E_Unit_Name := Get_Unit_Name (RE_Unit_Table (E));
344 if not Is_Loaded (E_Unit_Name) then
348 -- Here the unit containing the entity is loaded. We have not made
349 -- an explicit call to RTE to get the entity in question, but we may
350 -- have obtained a reference to it indirectly from some other entity
351 -- in the same unit, or some other unit that references it.
353 -- Get the defining unit of the entity
357 if Ekind (S) /= E_Package then
361 Ent_Unit_Name := Get_Unit_Name (Unit_Declaration_Node (S));
363 -- If the defining unit of the entity we are testing is not the
364 -- unit containing E, then they cannot possibly match.
366 if Ent_Unit_Name /= E_Unit_Name then
370 -- If the units match, then compare the names (remember that no
371 -- overloading is permitted in entities fetched using Rtsfind).
373 if RE_Chars (E) = Chars (Ent) then
376 -- If front-end inlining is enabled, we may be within a body that
377 -- contains inlined functions, which has not been retrieved through
378 -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table.
379 -- Add the unit information now, it must be fully available.
382 U : RT_Unit_Table_Record
383 renames RT_Unit_Table (RE_Unit_Table (E));
385 if No (U.Entity) then
387 U.Uname := E_Unit_Name;
388 U.Unum := Get_Source_Unit (S);
402 function Is_RTU (Ent : Entity_Id; U : RTU_Id) return Boolean is
403 E : constant Entity_Id := RT_Unit_Table (U).Entity;
405 return Present (E) and then E = Ent;
408 ----------------------------
409 -- Is_Text_IO_Kludge_Unit --
410 ----------------------------
412 function Is_Text_IO_Kludge_Unit (Nam : Node_Id) return Boolean is
417 if Nkind (Nam) /= N_Expanded_Name then
422 Sel := Selector_Name (Nam);
424 if Nkind (Sel) /= N_Expanded_Name
425 or else Nkind (Prf) /= N_Identifier
426 or else Chars (Prf) /= Name_Ada
432 Sel := Selector_Name (Sel);
435 Nkind (Prf) = N_Identifier
437 (Chars (Prf) = Name_Text_IO or else Chars (Prf) = Name_Wide_Text_IO)
439 Nkind (Sel) = N_Identifier
441 Chars (Sel) in Text_IO_Package_Name;
442 end Is_Text_IO_Kludge_Unit;
448 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id) is
449 M : String (1 .. 100);
453 -- Output header message
455 if Configurable_Run_Time_Mode then
456 RTE_Error_Msg ("construct not allowed in configurable run-time mode");
458 RTE_Error_Msg ("run-time library configuration error");
461 -- Output file name and reason string
464 or else not Configurable_Run_Time_Mode
465 or else All_Errors_Mode
467 M (1 .. 6) := "\file ";
471 (Get_File_Name (RT_Unit_Table (U_Id).Uname, Subunit => False));
472 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
478 M (P + 1 .. P + S'Length) := S;
481 RTE_Error_Msg (M (1 .. P));
483 -- Output entity name
485 Output_Entity_Name (Id, "not available");
488 raise RE_Not_Available;
497 Id : RE_Id := RE_Null;
498 Use_Setting : Boolean := False)
500 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
501 Priv_Par : constant Elist_Id := New_Elmt_List;
504 procedure Save_Private_Visibility;
505 -- If the current unit is the body of child unit or the spec of a
506 -- private child unit, the private declarations of the parent (s)
507 -- are visible. If the unit to be loaded is another public sibling,
508 -- its compilation will affect the visibility of the common ancestors.
509 -- Indicate those that must be restored.
511 procedure Restore_Private_Visibility;
512 -- Restore the visibility of ancestors after compiling RTU.
514 --------------------------------
515 -- Restore_Private_Visibility --
516 --------------------------------
518 procedure Restore_Private_Visibility is
522 E_Par := First_Elmt (Priv_Par);
524 while Present (E_Par) loop
525 if not In_Private_Part (Node (E_Par)) then
526 Install_Private_Declarations (Node (E_Par));
531 end Restore_Private_Visibility;
533 -----------------------------
534 -- Save_Private_Visibility --
535 -----------------------------
537 procedure Save_Private_Visibility is
541 Par := Scope (Current_Scope);
544 and then Par /= Standard_Standard
546 if Ekind (Par) = E_Package
547 and then Is_Compilation_Unit (Par)
548 and then In_Private_Part (Par)
550 Append_Elmt (Par, Priv_Par);
555 end Save_Private_Visibility;
557 -- Start of processing for Load_RTU
560 -- Nothing to do if unit is already loaded
562 if Present (U.Entity) then
566 -- Note if secondary stack is used
568 if U_Id = System_Secondary_Stack then
569 Opt.Sec_Stack_Used := True;
572 -- Otherwise we need to load the unit, First build unit name
573 -- from the enumeration literal name in type RTU_Id.
575 U.Uname := Get_Unit_Name (U_Id);
580 pragma Warnings (Off, Loaded);
582 Loaded := Is_Loaded (U.Uname);
585 -- Now do the load call, note that setting Error_Node to Empty is
586 -- a signal to Load_Unit that we will regard a failure to find the
587 -- file as a fatal error, and that it should not output any kind
588 -- of diagnostics, since we will take care of it here.
592 (Load_Name => U.Uname,
595 Error_Node => Empty);
597 if U.Unum = No_Unit then
598 Load_Fail ("not found", U_Id, Id);
599 elsif Fatal_Error (U.Unum) then
600 Load_Fail ("had parser errors", U_Id, Id);
603 -- Make sure that the unit is analyzed
606 Was_Analyzed : constant Boolean :=
607 Analyzed (Cunit (Current_Sem_Unit));
610 -- Pretend that the current unit is analyzed, in case it is System
611 -- or some such. This allows us to put some declarations, such as
612 -- exceptions and packed arrays of Boolean, into System even though
613 -- expanding them requires System...
615 -- This is a bit odd but works fine. If the RTS unit does not depend
616 -- in any way on the current unit, then it never gets back into the
617 -- current unit's tree, and the change we make to the current unit
618 -- tree is never noticed by anyone (it is undone in a moment). That
619 -- is the normal situation.
621 -- If the RTS Unit *does* depend on the current unit, for instance,
622 -- when you are compiling System, then you had better have finished
623 -- analyzing the part of System that is depended on before you try
624 -- to load the RTS Unit. This means having the System ordered in an
625 -- appropriate manner.
627 Set_Analyzed (Cunit (Current_Sem_Unit), True);
629 if not Analyzed (Cunit (U.Unum)) then
630 Save_Private_Visibility;
631 Semantics (Cunit (U.Unum));
632 Restore_Private_Visibility;
634 if Fatal_Error (U.Unum) then
635 Load_Fail ("had semantic errors", U_Id, Id);
641 Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed);
644 Lib_Unit := Unit (Cunit (U.Unum));
645 U.Entity := Defining_Entity (Lib_Unit);
648 Set_Is_Potentially_Use_Visible (U.Entity, True);
652 -----------------------
653 -- Output_Entity_Name --
654 ------------------------
656 procedure Output_Entity_Name (Id : RE_Id; Msg : String) is
657 M : String (1 .. 2048);
659 -- M (1 .. P) is current message to be output
661 RE_Image : constant String := RE_Id'Image (Id);
664 if Id = RE_Null or else not All_Errors_Mode then
668 M (1 .. 9) := "\entity """;
671 -- Add unit name to message, excluding %s or %b at end
673 Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id)));
674 Name_Len := Name_Len - 2;
675 Set_Casing (Mixed_Case);
676 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
679 -- Add a qualifying period
684 -- Add entity name and closing quote to message
686 Name_Len := RE_Image'Length - 3;
687 Name_Buffer (1 .. Name_Len) := RE_Image (4 .. RE_Image'Length);
688 Set_Casing (Mixed_Case);
689 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len);
698 M (P + 1 .. P + Msg'Length) := Msg;
701 -- Output message at current error node location
703 RTE_Error_Msg (M (1 .. P));
704 end Output_Entity_Name;
710 function RE_Chars (E : RE_Id) return Name_Id is
711 RE_Name_Chars : constant String := RE_Id'Image (E);
714 -- Copy name skipping initial RE_ or RO_XX characters
716 if RE_Name_Chars (1 .. 2) = "RE" then
717 for J in 4 .. RE_Name_Chars'Last loop
718 Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J));
721 Name_Len := RE_Name_Chars'Length - 3;
724 for J in 7 .. RE_Name_Chars'Last loop
725 Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J));
728 Name_Len := RE_Name_Chars'Length - 6;
738 function RTE (E : RE_Id) return Entity_Id is
739 U_Id : constant RTU_Id := RE_Unit_Table (E);
740 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
746 -- The following flag is used to disable front-end inlining when RTE
747 -- is invoked. This prevents the analysis of other runtime bodies when
748 -- a particular spec is loaded through Rtsfind. This is both efficient,
749 -- and it prevents spurious visibility conflicts between use-visible
750 -- user entities, and entities in run-time packages.
752 -- In configurable run-time mode, subprograms marked Inlined_Always must
753 -- be inlined, so in the case we retain the Front_End_Inlining mode.
755 Save_Front_End_Inlining : Boolean;
757 function Check_CRT (Eid : Entity_Id) return Entity_Id;
758 -- Check entity Eid to ensure that configurable run-time restrictions
759 -- are met. May generate an error message and raise RE_Not_Available
760 -- if the entity E does not exist (i.e. Eid is Empty)
763 -- Reject programs that make use of distribution features not supported
764 -- on the current target. On such targets (VMS, Vxworks, others?) we
765 -- only provide a minimal body for System.Rpc that only supplies an
766 -- implementation of partition_id.
768 function Find_Local_Entity (E : RE_Id) return Entity_Id;
769 -- This function is used when entity E is in this compilation's main
770 -- unit. It gets the value from the already compiled declaration.
772 function Make_Unit_Name (N : Node_Id) return Node_Id;
773 -- If the unit is a child unit, build fully qualified name for use
780 function Check_CRT (Eid : Entity_Id) return Entity_Id is
783 Entity_Not_Defined (E);
784 raise RE_Not_Available;
786 -- Entity is available
789 -- If in No_Run_Time mode and entity is not in one of the
790 -- specially permitted units, raise the exception.
793 and then not OK_No_Run_Time_Unit (U_Id)
795 Entity_Not_Defined (E);
796 raise RE_Not_Available;
799 -- Otherwise entity is accessible
809 procedure Check_RPC is
811 -- Bypass this check if debug flag -gnatdR set
813 if Debug_Flag_RR then
817 -- Otherwise we need the check if we are going after one of
818 -- the critical entities in System.RPC in stubs mode.
820 -- ??? Should we do this for other s-parint/s-polint entities
823 if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
825 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
826 and then (E = RE_Do_Rpc
830 E = RE_Params_Stream_Type
835 DSA_Implementation : constant Entity_Id :=
836 RTE (RE_DSA_Implementation);
838 if Chars (Entity (Expression
839 (Parent (DSA_Implementation)))) = Name_No_DSA
842 Write_Str ("distribution feature not supported");
844 raise Unrecoverable_Error;
850 ------------------------
851 -- Find_System_Entity --
852 ------------------------
854 function Find_Local_Entity (E : RE_Id) return Entity_Id is
855 RE_Str : String renames RE_Id'Image (E);
858 Save_Nam : constant String := Name_Buffer (1 .. Name_Len);
859 -- Save name buffer and length over call
862 Name_Len := Natural'Max (0, RE_Str'Length - 3);
863 Name_Buffer (1 .. Name_Len) :=
864 RE_Str (RE_Str'First + 3 .. RE_Str'Last);
866 Ent := Entity_Id (Get_Name_Table_Info (Name_Find));
868 Name_Len := Save_Nam'Length;
869 Name_Buffer (1 .. Name_Len) := Save_Nam;
872 end Find_Local_Entity;
878 function Make_Unit_Name (N : Node_Id) return Node_Id is
883 Nam := New_Reference_To (U.Entity, Standard_Location);
884 Scop := Scope (U.Entity);
886 if Nkind (N) = N_Defining_Program_Unit_Name then
887 while Scop /= Standard_Standard loop
889 Make_Expanded_Name (Standard_Location,
890 Chars => Chars (U.Entity),
891 Prefix => New_Reference_To (Scop, Standard_Location),
892 Selector_Name => Nam);
893 Set_Entity (Nam, U.Entity);
895 Scop := Scope (Scop);
902 -- Start of processing for RTE
905 -- Doing a rtsfind in system.ads is special, as we cannot do this
906 -- when compiling System itself. So if we are compiling system then
907 -- we should already have acquired and processed the declaration
908 -- of the entity. The test is to see if this compilation's main unit
909 -- is System. If so, return the value from the already compiled
910 -- declaration and otherwise do a regular find.
912 -- Not pleasant, but these kinds of annoying recursion when
913 -- writing an Ada compiler in Ada have to be broken somewhere!
915 if Present (Main_Unit_Entity)
916 and then Chars (Main_Unit_Entity) = Name_System
917 and then Analyzed (Main_Unit_Entity)
918 and then not Is_Child_Unit (Main_Unit_Entity)
920 return Check_CRT (Find_Local_Entity (E));
923 Save_Front_End_Inlining := Front_End_Inlining;
924 Front_End_Inlining := Configurable_Run_Time_Mode;
926 -- Load unit if unit not previously loaded
928 if No (RE_Table (E)) then
929 Load_RTU (U_Id, Id => E);
930 Lib_Unit := Unit (Cunit (U.Unum));
932 -- In the subprogram case, we are all done, the entity we want
933 -- is the entity for the subprogram itself. Note that we do not
934 -- bother to check that it is the entity that was requested.
935 -- the only way that could fail to be the case is if runtime is
936 -- hopelessly misconfigured, and it isn't worth testing for this.
938 if Nkind (Lib_Unit) = N_Subprogram_Declaration then
939 RE_Table (E) := U.Entity;
941 -- Otherwise we must have the package case. First check package
942 -- entity itself (e.g. RTE_Name for System.Interrupts.Name)
945 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration);
946 Ename := RE_Chars (E);
948 -- First we search the package entity chain
950 Pkg_Ent := First_Entity (U.Entity);
951 while Present (Pkg_Ent) loop
952 if Ename = Chars (Pkg_Ent) then
953 RE_Table (E) := Pkg_Ent;
958 Next_Entity (Pkg_Ent);
961 -- If we did not find the entity in the package entity chain,
962 -- then check if the package entity itself matches. Note that
963 -- we do this check after searching the entity chain, since
964 -- the rule is that in case of ambiguity, we prefer the entity
965 -- defined within the package, rather than the package itself.
967 if Ename = Chars (U.Entity) then
968 RE_Table (E) := U.Entity;
971 -- If we didn't find the entity we want, something is wrong.
972 -- We just leave RE_Table (E) set to Empty and the appropriate
973 -- action will be taken by Check_CRT when we exit.
978 -- See if we have to generate a WITH for this entity. We generate
979 -- a WITH if the current unit is part of the extended main code
980 -- unit, and if we have not already added the with. The WITH is
981 -- added to the appropriate unit (the current one). We do not need
982 -- to generate a WITH for an ????
987 In_Extended_Main_Code_Unit (Cunit_Entity (Current_Sem_Unit))
988 and then not RTE_Available_Call
997 Lib_Unit := Unit (Cunit (U.Unum));
999 Make_With_Clause (Standard_Location,
1002 (Defining_Unit_Name (Specification (Lib_Unit))));
1003 Set_Library_Unit (Withn, Cunit (U.Unum));
1004 Set_Corresponding_Spec (Withn, U.Entity);
1005 Set_First_Name (Withn, True);
1006 Set_Implicit_With (Withn, True);
1008 Mark_Rewrite_Insertion (Withn);
1009 Append (Withn, Context_Items (Cunit (Current_Sem_Unit)));
1013 Front_End_Inlining := Save_Front_End_Inlining;
1014 return Check_CRT (RE_Table (E));
1021 function RTE_Available (E : RE_Id) return Boolean is
1023 pragma Warnings (Off, Dummy);
1027 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call;
1028 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available;
1029 -- These are saved recursively because the call to load a unit
1030 -- caused by an upper level call may perform a recursive call
1031 -- to this routine during analysis of the corresponding unit.
1034 RTE_Available_Call := True;
1035 RTE_Is_Available := True;
1037 Result := RTE_Is_Available;
1038 RTE_Available_Call := Save_RTE_Available_Call;
1039 RTE_Is_Available := Save_RTE_Is_Available;
1043 when RE_Not_Available =>
1044 RTE_Available_Call := Save_RTE_Available_Call;
1045 RTE_Is_Available := Save_RTE_Is_Available;
1053 procedure RTE_Error_Msg (Msg : String) is
1055 if RTE_Available_Call then
1056 RTE_Is_Available := False;
1058 Error_Msg_N (Msg, Current_Error_Node);
1060 -- Bump count of violations if we are in configurable run-time
1061 -- mode and this is not a continuation message.
1063 if Configurable_Run_Time_Mode and then Msg (1) /= '\' then
1064 Configurable_Run_Time_Violations :=
1065 Configurable_Run_Time_Violations + 1;
1074 function RTU_Loaded (U : RTU_Id) return Boolean is
1076 return Present (RT_Unit_Table (U).Entity);
1079 --------------------
1080 -- Set_RTU_Loaded --
1081 --------------------
1083 procedure Set_RTU_Loaded (N : Node_Id) is
1084 Loc : constant Source_Ptr := Sloc (N);
1085 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1086 Uname : constant Unit_Name_Type := Unit_Name (Unum);
1087 E : constant Entity_Id :=
1088 Defining_Entity (Unit (Cunit (Unum)));
1090 pragma Assert (Is_Predefined_File_Name (Unit_File_Name (Unum)));
1092 -- Loop through entries in RTU table looking for matching entry
1094 for U_Id in RTU_Id'Range loop
1096 -- Here we have a match
1098 if Get_Unit_Name (U_Id) = Uname then
1100 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id);
1101 -- The RT_Unit_Table entry that may need updating
1104 -- If entry is not set, set it now
1106 if not Present (U.Entity) then
1108 U.Uname := Get_Unit_Name (U_Id);
1119 --------------------
1120 -- Text_IO_Kludge --
1121 --------------------
1123 procedure Text_IO_Kludge (Nam : Node_Id) is
1126 type Name_Map_Type is array (Text_IO_Package_Name) of RTU_Id;
1128 Name_Map : constant Name_Map_Type := Name_Map_Type'(
1129 Name_Decimal_IO => Ada_Text_IO_Decimal_IO,
1130 Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO,
1131 Name_Fixed_IO => Ada_Text_IO_Fixed_IO,
1132 Name_Float_IO => Ada_Text_IO_Float_IO,
1133 Name_Integer_IO => Ada_Text_IO_Integer_IO,
1134 Name_Modular_IO => Ada_Text_IO_Modular_IO);
1136 Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'(
1137 Name_Decimal_IO => Ada_Wide_Text_IO_Decimal_IO,
1138 Name_Enumeration_IO => Ada_Wide_Text_IO_Enumeration_IO,
1139 Name_Fixed_IO => Ada_Wide_Text_IO_Fixed_IO,
1140 Name_Float_IO => Ada_Wide_Text_IO_Float_IO,
1141 Name_Integer_IO => Ada_Wide_Text_IO_Integer_IO,
1142 Name_Modular_IO => Ada_Wide_Text_IO_Modular_IO);
1145 -- Nothing to do if name is not identifier or a selected component
1146 -- whose selector_name is not an identifier.
1148 if Nkind (Nam) = N_Identifier then
1149 Chrs := Chars (Nam);
1151 elsif Nkind (Nam) = N_Selected_Component
1152 and then Nkind (Selector_Name (Nam)) = N_Identifier
1154 Chrs := Chars (Selector_Name (Nam));
1160 -- Nothing to do if name is not one of the Text_IO subpackages
1161 -- Otherwise look through loaded units, and if we find Text_IO
1162 -- or Wide_Text_IO already loaded, then load the proper child.
1164 if Chrs in Text_IO_Package_Name then
1165 for U in Main_Unit .. Last_Unit loop
1166 Get_Name_String (Unit_File_Name (U));
1168 if Name_Len = 12 then
1170 -- Here is where we do the loads if we find one of the
1171 -- units Ada.Text_IO or Ada.Wide_Text_IO. An interesting
1172 -- detail is that these units may already be used (i.e.
1173 -- their In_Use flags may be set). Normally when the In_Use
1174 -- flag is set, the Is_Potentially_Use_Visible flag of all
1175 -- entities in the package is set, but the new entity we
1176 -- are mysteriously adding was not there to have its flag
1177 -- set at the time. So that's why we pass the extra parameter
1178 -- to RTU_Find, to make sure the flag does get set now.
1179 -- Given that those generic packages are in fact child units,
1180 -- we must indicate that they are visible.
1182 if Name_Buffer (1 .. 12) = "a-textio.ads" then
1185 Use_Setting => In_Use (Cunit_Entity (U)));
1186 Set_Is_Visible_Child_Unit
1187 (RT_Unit_Table (Name_Map (Chrs)).Entity);
1189 elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then
1191 (Wide_Name_Map (Chrs),
1192 Use_Setting => In_Use (Cunit_Entity (U)));
1193 Set_Is_Visible_Child_Unit
1194 (RT_Unit_Table (Wide_Name_Map (Chrs)).Entity);