1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, 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_Aux
; use Sem_Aux
;
46 with Sem_Ch7
; use Sem_Ch7
;
47 with Sem_Dist
; use Sem_Dist
;
48 with Sem_Util
; use Sem_Util
;
49 with Sinfo
; use Sinfo
;
50 with Stand
; use Stand
;
51 with Snames
; use Snames
;
52 with Tbuild
; use Tbuild
;
53 with Uname
; use Uname
;
55 package body Rtsfind
is
57 RTE_Available_Call
: Boolean := False;
58 -- Set True during call to RTE from RTE_Available (or from call to
59 -- RTE_Record_Component from RTE_Record_Component_Available). Tells
60 -- the called subprogram to set RTE_Is_Available to False rather than
61 -- generating an error message.
63 RTE_Is_Available
: Boolean;
64 -- Set True by RTE_Available on entry. When RTE_Available_Call is set
65 -- True, set False if RTE would otherwise generate an error message.
71 -- The unit table has one entry for each unit included in the definition
72 -- of the type RTU_Id in the spec. The table entries are initialized in
73 -- Initialize to set the Entity field to Empty, indicating that the
74 -- corresponding unit has not yet been loaded. The fields are set when
75 -- a unit is loaded to contain the defining entity for the unit, the
76 -- unit name, and the unit number.
78 -- Note that a unit can be loaded either by a call to find an entity
79 -- within the unit (e.g. RTE), or by an explicit with of the unit. In
80 -- the latter case it is critical to make a call to Set_RTU_Loaded to
81 -- ensure that the entry in this table reflects the load.
83 -- A unit retrieved through rtsfind may end up in the context of several
84 -- other units, in addition to the main unit. These additional with_clauses
85 -- are needed to generate a proper traversal order for CodePeer. To
86 -- minimize somewhat the redundancy created by numerous calls to rtsfind
87 -- from different units, we keep track of the list of implicit with_clauses
88 -- already created for the current loaded unit.
90 type RT_Unit_Table_Record
is record
92 Uname
: Unit_Name_Type
;
93 First_Implicit_With
: Node_Id
;
94 Unum
: Unit_Number_Type
;
97 RT_Unit_Table
: array (RTU_Id
) of RT_Unit_Table_Record
;
99 --------------------------
100 -- Runtime Entity Table --
101 --------------------------
103 -- There is one entry in the runtime entity table for each entity that is
104 -- included in the definition of the RE_Id type in the spec. The entries
105 -- are set by Initialize_Rtsfind to contain Empty, indicating that the
106 -- entity has not yet been located. Once the entity is located for the
107 -- first time, its ID is stored in this array, so that subsequent calls
108 -- for the same entity can be satisfied immediately.
110 -- NOTE: In order to avoid conflicts between record components and subprgs
111 -- that have the same name (i.e. subprogram External_Tag and
112 -- component External_Tag of package Ada.Tags) this table is not used
113 -- with Record_Components.
115 RE_Table
: array (RE_Id
) of Entity_Id
;
117 --------------------------------
118 -- Generation of with_clauses --
119 --------------------------------
121 -- When a unit is implicitly loaded as a result of a call to RTE, it is
122 -- necessary to create one or two implicit with_clauses. We add such
123 -- with_clauses to the extended main unit if needed, and also to whatever
124 -- unit needs them, which is not necessarily the main unit. The former
125 -- ensures that the object is correctly loaded by the binder. The latter
126 -- is necessary for CodePeer.
128 -- The field First_Implicit_With in the unit table record are used to
129 -- avoid creating duplicate with_clauses.
131 -----------------------
132 -- Local Subprograms --
133 -----------------------
135 function Check_CRT
(E
: RE_Id
; Eid
: Entity_Id
) return Entity_Id
;
136 -- Check entity Eid to ensure that configurable run-time restrictions are
137 -- met. May generate an error message (if RTE_Available_Call is false) and
138 -- raise RE_Not_Available if entity E does not exist (e.g. Eid is Empty).
139 -- Also check that entity is not overloaded.
141 procedure Entity_Not_Defined
(Id
: RE_Id
);
142 -- Outputs error messages for an entity that is not defined in the run-time
143 -- library (the form of the error message is tailored for no run time or
144 -- configurable run time mode as required).
146 function Get_Unit_Name
(U_Id
: RTU_Id
) return Unit_Name_Type
;
147 -- Retrieves the Unit Name given a unit id represented by its enumeration
150 procedure Load_Fail
(S
: String; U_Id
: RTU_Id
; Id
: RE_Id
);
151 pragma No_Return
(Load_Fail
);
152 -- Internal procedure called if we can't successfully locate or process a
153 -- run-time unit. The parameters give information about the error message
154 -- to be given. S is a reason for failing to compile the file and U_Id is
155 -- the unit id. RE_Id is the RE_Id originally passed to RTE. The message in
156 -- S is one of the following:
159 -- "had parser errors"
160 -- "had semantic errors"
162 -- The "not found" case is treated specially in that it is considered
163 -- a normal situation in configurable run-time mode, and generates
164 -- a warning, but is otherwise ignored.
168 Id
: RE_Id
:= RE_Null
;
169 Use_Setting
: Boolean := False);
170 -- Load the unit whose Id is given if not already loaded. The unit is
171 -- loaded and analyzed, and the entry in RT_Unit_Table is updated to
172 -- reflect the load. Use_Setting is used to indicate the initial setting
173 -- for the Is_Potentially_Use_Visible flag of the entity for the loaded
174 -- unit (if it is indeed loaded). A value of False means nothing special
175 -- need be done. A value of True indicates that this flag must be set to
176 -- True. It is needed only in the Text_IO_Kludge procedure, which may
177 -- materialize an entity of Text_IO (or [Wide_]Wide_Text_IO) that was
178 -- previously unknown. Id is the RE_Id value of the entity which was
179 -- originally requested. Id is used only for error message detail, and if
180 -- it is RE_Null, then the attempt to output the entity name is ignored.
182 function Make_Unit_Name
183 (U
: RT_Unit_Table_Record
;
184 N
: Node_Id
) return Node_Id
;
185 -- If the unit is a child unit, build fully qualified name for use in
188 procedure Maybe_Add_With
(U
: in out RT_Unit_Table_Record
);
189 -- If necessary, add an implicit with_clause from the current unit to the
190 -- one represented by U.
192 procedure Output_Entity_Name
(Id
: RE_Id
; Msg
: String);
193 -- Output continuation error message giving qualified name of entity
194 -- corresponding to Id, appending the string given by Msg. This call
195 -- is only effective in All_Errors mode.
197 function RE_Chars
(E
: RE_Id
) return Name_Id
;
198 -- Given a RE_Id value returns the Chars of the corresponding entity
200 procedure RTE_Error_Msg
(Msg
: String);
201 -- Generates a message by calling Error_Msg_N specifying Current_Error_Node
202 -- as the node location using the given Msg text. Special processing in the
203 -- case where RTE_Available_Call is set. In this case, no message is output
204 -- and instead RTE_Is_Available is set to False. Note that this can only be
205 -- used if you are sure that the message comes directly or indirectly from
206 -- a call to the RTE function.
212 function Check_CRT
(E
: RE_Id
; Eid
: Entity_Id
) return Entity_Id
is
213 U_Id
: constant RTU_Id
:= RE_Unit_Table
(E
);
217 if RTE_Available_Call
then
218 RTE_Is_Available
:= False;
220 Entity_Not_Defined
(E
);
223 raise RE_Not_Available
;
225 -- Entity is available
228 -- If in No_Run_Time mode and entity is not in one of the
229 -- specially permitted units, raise the exception.
232 and then not OK_No_Run_Time_Unit
(U_Id
)
234 Entity_Not_Defined
(E
);
235 raise RE_Not_Available
;
238 -- Check entity is not overloaded, checking for special exceptions
241 and then E
/= RE_Save_Occurrence
244 Write_Str
("Run-time configuration error (");
245 Write_Str
("rtsfind entity """);
246 Get_Decoded_Name_String
(Chars
(Eid
));
247 Set_Casing
(Mixed_Case
);
248 Write_Str
(Name_Buffer
(1 .. Name_Len
));
249 Write_Str
(""" is overloaded)");
251 raise Unrecoverable_Error
;
254 -- Otherwise entity is accessible
260 ------------------------
261 -- Entity_Not_Defined --
262 ------------------------
264 procedure Entity_Not_Defined
(Id
: RE_Id
) is
266 if No_Run_Time_Mode
then
268 -- If the error occurs when compiling the body of a predefined
269 -- unit for inlining purposes, the body must be illegal in this
270 -- mode, and there is no point in continuing.
272 if Is_Predefined_File_Name
273 (Unit_File_Name
(Get_Source_Unit
(Sloc
(Current_Error_Node
))))
276 ("construct not allowed in no run time mode!",
278 raise Unrecoverable_Error
;
281 RTE_Error_Msg
("|construct not allowed in no run time mode");
284 elsif Configurable_Run_Time_Mode
then
285 RTE_Error_Msg
("|construct not allowed in this configuration>");
287 RTE_Error_Msg
("run-time configuration error");
290 Output_Entity_Name
(Id
, "not defined");
291 end Entity_Not_Defined
;
297 function Get_Unit_Name
(U_Id
: RTU_Id
) return Unit_Name_Type
is
298 Uname_Chars
: constant String := RTU_Id
'Image (U_Id
);
301 Name_Len
:= Uname_Chars
'Length;
302 Name_Buffer
(1 .. Name_Len
) := Uname_Chars
;
303 Set_Casing
(All_Lower_Case
);
305 if U_Id
in Ada_Child
then
306 Name_Buffer
(4) := '.';
308 if U_Id
in Ada_Calendar_Child
then
309 Name_Buffer
(13) := '.';
311 elsif U_Id
in Ada_Dispatching_Child
then
312 Name_Buffer
(16) := '.';
314 elsif U_Id
in Ada_Interrupts_Child
then
315 Name_Buffer
(15) := '.';
317 elsif U_Id
in Ada_Numerics_Child
then
318 Name_Buffer
(13) := '.';
320 elsif U_Id
in Ada_Real_Time_Child
then
321 Name_Buffer
(14) := '.';
323 elsif U_Id
in Ada_Streams_Child
then
324 Name_Buffer
(12) := '.';
326 elsif U_Id
in Ada_Strings_Child
then
327 Name_Buffer
(12) := '.';
329 elsif U_Id
in Ada_Text_IO_Child
then
330 Name_Buffer
(12) := '.';
332 elsif U_Id
in Ada_Wide_Text_IO_Child
then
333 Name_Buffer
(17) := '.';
335 elsif U_Id
in Ada_Wide_Wide_Text_IO_Child
then
336 Name_Buffer
(22) := '.';
339 elsif U_Id
in Interfaces_Child
then
340 Name_Buffer
(11) := '.';
342 elsif U_Id
in System_Child
then
343 Name_Buffer
(7) := '.';
345 if U_Id
in System_Dim_Child
then
346 Name_Buffer
(11) := '.';
349 if U_Id
in System_Multiprocessors_Child
then
350 Name_Buffer
(23) := '.';
353 if U_Id
in System_Storage_Pools_Child
then
354 Name_Buffer
(21) := '.';
357 if U_Id
in System_Strings_Child
then
358 Name_Buffer
(15) := '.';
361 if U_Id
in System_Tasking_Child
then
362 Name_Buffer
(15) := '.';
365 if U_Id
in System_Tasking_Restricted_Child
then
366 Name_Buffer
(26) := '.';
369 if U_Id
in System_Tasking_Protected_Objects_Child
then
370 Name_Buffer
(33) := '.';
373 if U_Id
in System_Tasking_Async_Delays_Child
then
374 Name_Buffer
(28) := '.';
378 -- Add %s at end for spec
380 Name_Buffer
(Name_Len
+ 1) := '%';
381 Name_Buffer
(Name_Len
+ 2) := 's';
382 Name_Len
:= Name_Len
+ 2;
391 procedure Initialize
is
393 -- Initialize the unit table
396 RT_Unit_Table
(J
).Entity
:= Empty
;
400 RE_Table
(J
) := Empty
;
403 RTE_Is_Available
:= False;
410 function Is_RTE
(Ent
: Entity_Id
; E
: RE_Id
) return Boolean is
411 E_Unit_Name
: Unit_Name_Type
;
412 Ent_Unit_Name
: Unit_Name_Type
;
422 -- If E has already a corresponding entity, check it directly,
423 -- going to full views if they exist to deal with the incomplete
424 -- and private type cases properly.
426 elsif Present
(RE_Table
(E
)) then
429 if Is_Type
(E1
) and then Present
(Full_View
(E1
)) then
430 E1
:= Full_View
(E1
);
435 if Is_Type
(E2
) and then Present
(Full_View
(E2
)) then
436 E2
:= Full_View
(E2
);
442 -- If the unit containing E is not loaded, we already know that the
443 -- entity we have cannot have come from this unit.
445 E_Unit_Name
:= Get_Unit_Name
(RE_Unit_Table
(E
));
447 if not Is_Loaded
(E_Unit_Name
) then
451 -- Here the unit containing the entity is loaded. We have not made
452 -- an explicit call to RTE to get the entity in question, but we may
453 -- have obtained a reference to it indirectly from some other entity
454 -- in the same unit, or some other unit that references it.
456 -- Get the defining unit of the entity
460 if Ekind
(S
) /= E_Package
then
464 Ent_Unit_Name
:= Get_Unit_Name
(Unit_Declaration_Node
(S
));
466 -- If the defining unit of the entity we are testing is not the
467 -- unit containing E, then they cannot possibly match.
469 if Ent_Unit_Name
/= E_Unit_Name
then
473 -- If the units match, then compare the names (remember that no
474 -- overloading is permitted in entities fetched using Rtsfind).
476 if RE_Chars
(E
) = Chars
(Ent
) then
479 -- If front-end inlining is enabled, we may be within a body that
480 -- contains inlined functions, which has not been retrieved through
481 -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table.
482 -- Add the unit information now, it must be fully available.
485 U
: RT_Unit_Table_Record
486 renames RT_Unit_Table
(RE_Unit_Table
(E
));
488 if No
(U
.Entity
) then
490 U
.Uname
:= E_Unit_Name
;
491 U
.Unum
:= Get_Source_Unit
(S
);
505 function Is_RTU
(Ent
: Entity_Id
; U
: RTU_Id
) return Boolean is
506 E
: constant Entity_Id
:= RT_Unit_Table
(U
).Entity
;
508 return Present
(E
) and then E
= Ent
;
511 ----------------------------
512 -- Is_Text_IO_Kludge_Unit --
513 ----------------------------
515 function Is_Text_IO_Kludge_Unit
(Nam
: Node_Id
) return Boolean is
520 if Nkind
(Nam
) /= N_Expanded_Name
then
525 Sel
:= Selector_Name
(Nam
);
527 if Nkind
(Sel
) /= N_Expanded_Name
528 or else Nkind
(Prf
) /= N_Identifier
529 or else Chars
(Prf
) /= Name_Ada
535 Sel
:= Selector_Name
(Sel
);
538 Nkind
(Prf
) = N_Identifier
540 Nam_In
(Chars
(Prf
), Name_Text_IO
,
542 Name_Wide_Wide_Text_IO
)
543 and then Nkind
(Sel
) = N_Identifier
544 and then Chars
(Sel
) in Text_IO_Package_Name
;
545 end Is_Text_IO_Kludge_Unit
;
551 procedure Load_Fail
(S
: String; U_Id
: RTU_Id
; Id
: RE_Id
) is
552 M
: String (1 .. 100);
556 -- Output header message
558 if Configurable_Run_Time_Mode
then
559 RTE_Error_Msg
("construct not allowed in configurable run-time mode");
561 RTE_Error_Msg
("run-time library configuration error");
564 -- Output file name and reason string
566 M
(1 .. 6) := "\file ";
570 (Get_File_Name
(RT_Unit_Table
(U_Id
).Uname
, Subunit
=> False));
571 M
(P
+ 1 .. P
+ Name_Len
) := Name_Buffer
(1 .. Name_Len
);
577 M
(P
+ 1 .. P
+ S
'Length) := S
;
580 RTE_Error_Msg
(M
(1 .. P
));
582 -- Output entity name
584 Output_Entity_Name
(Id
, "not available");
586 -- In configurable run time mode, we raise RE_Not_Available, and the
587 -- caller is expected to deal gracefully with this. In the case of a
588 -- call to RTE_Available, this exception will be caught in Rtsfind,
589 -- and result in a returned value of False for the call.
591 if Configurable_Run_Time_Mode
then
592 raise RE_Not_Available
;
594 -- Here we have a load failure in normal full run time mode. See if we
595 -- are in the context of an RTE_Available call. If so, we just raise
596 -- RE_Not_Available. This can happen if a unit is unavailable, which
597 -- happens for example in the VM case, where the run-time is not
598 -- complete, but we do not regard it as a configurable run-time.
599 -- If the caller has done an explicit call to RTE_Available, then
600 -- clearly the caller is prepared to deal with a result of False.
602 elsif RTE_Available_Call
then
603 RTE_Is_Available
:= False;
604 raise RE_Not_Available
;
606 -- If we are not in the context of an RTE_Available call, we are really
607 -- trying to load an entity that is not there, and that should never
608 -- happen, so in this case we signal a fatal error.
611 raise Unrecoverable_Error
;
621 Id
: RE_Id
:= RE_Null
;
622 Use_Setting
: Boolean := False)
624 U
: RT_Unit_Table_Record
renames RT_Unit_Table
(U_Id
);
625 Priv_Par
: constant Elist_Id
:= New_Elmt_List
;
628 procedure Save_Private_Visibility
;
629 -- If the current unit is the body of child unit or the spec of a
630 -- private child unit, the private declarations of the parent(s) are
631 -- visible. If the unit to be loaded is another public sibling, its
632 -- compilation will affect the visibility of the common ancestors.
633 -- Indicate those that must be restored.
635 procedure Restore_Private_Visibility
;
636 -- Restore the visibility of ancestors after compiling RTU
638 --------------------------------
639 -- Restore_Private_Visibility --
640 --------------------------------
642 procedure Restore_Private_Visibility
is
646 E_Par
:= First_Elmt
(Priv_Par
);
647 while Present
(E_Par
) loop
648 if not In_Private_Part
(Node
(E_Par
)) then
649 Install_Private_Declarations
(Node
(E_Par
));
654 end Restore_Private_Visibility
;
656 -----------------------------
657 -- Save_Private_Visibility --
658 -----------------------------
660 procedure Save_Private_Visibility
is
664 Par
:= Scope
(Current_Scope
);
666 and then Par
/= Standard_Standard
668 if Ekind
(Par
) = E_Package
669 and then Is_Compilation_Unit
(Par
)
670 and then In_Private_Part
(Par
)
672 Append_Elmt
(Par
, Priv_Par
);
677 end Save_Private_Visibility
;
679 -- Start of processing for Load_RTU
682 -- Nothing to do if unit is already loaded
684 if Present
(U
.Entity
) then
688 -- Note if secondary stack is used
690 if U_Id
= System_Secondary_Stack
then
691 Opt
.Sec_Stack_Used
:= True;
694 -- Otherwise we need to load the unit, First build unit name
695 -- from the enumeration literal name in type RTU_Id.
697 U
.Uname
:= Get_Unit_Name
(U_Id
);
698 U
. First_Implicit_With
:= Empty
;
700 -- Now do the load call, note that setting Error_Node to Empty is
701 -- a signal to Load_Unit that we will regard a failure to find the
702 -- file as a fatal error, and that it should not output any kind
703 -- of diagnostics, since we will take care of it here.
705 -- We save style checking switches and turn off style checking for
706 -- loading the unit, since we don't want any style checking!
709 Save_Style_Check
: constant Boolean := Style_Check
;
711 Style_Check
:= False;
714 (Load_Name
=> U
.Uname
,
717 Error_Node
=> Empty
);
718 Style_Check
:= Save_Style_Check
;
721 -- Check for bad unit load
723 if U
.Unum
= No_Unit
then
724 Load_Fail
("not found", U_Id
, Id
);
725 elsif Fatal_Error
(U
.Unum
) then
726 Load_Fail
("had parser errors", U_Id
, Id
);
729 -- Make sure that the unit is analyzed
732 Was_Analyzed
: constant Boolean :=
733 Analyzed
(Cunit
(Current_Sem_Unit
));
736 -- Pretend that the current unit is analyzed, in case it is System
737 -- or some such. This allows us to put some declarations, such as
738 -- exceptions and packed arrays of Boolean, into System even though
739 -- expanding them requires System...
741 -- This is a bit odd but works fine. If the RTS unit does not depend
742 -- in any way on the current unit, then it never gets back into the
743 -- current unit's tree, and the change we make to the current unit
744 -- tree is never noticed by anyone (it is undone in a moment). That
745 -- is the normal situation.
747 -- If the RTS Unit *does* depend on the current unit, for instance,
748 -- when you are compiling System, then you had better have finished
749 -- analyzing the part of System that is depended on before you try to
750 -- load the RTS Unit. This means having the code in System ordered in
751 -- an appropriate manner.
753 Set_Analyzed
(Cunit
(Current_Sem_Unit
), True);
755 if not Analyzed
(Cunit
(U
.Unum
)) then
757 -- If the unit is already loaded through a limited_with_clause,
758 -- the relevant entities must already be available. We do not
759 -- want to load and analyze the unit because this would create
760 -- a real semantic dependence when the purpose of the limited_with
761 -- is precisely to avoid such.
763 if From_Limited_With
(Cunit_Entity
(U
.Unum
)) then
767 Save_Private_Visibility
;
768 Semantics
(Cunit
(U
.Unum
));
769 Restore_Private_Visibility
;
771 if Fatal_Error
(U
.Unum
) then
772 Load_Fail
("had semantic errors", U_Id
, Id
);
779 Set_Analyzed
(Cunit
(Current_Sem_Unit
), Was_Analyzed
);
782 Lib_Unit
:= Unit
(Cunit
(U
.Unum
));
783 U
.Entity
:= Defining_Entity
(Lib_Unit
);
786 Set_Is_Potentially_Use_Visible
(U
.Entity
, True);
794 function Make_Unit_Name
795 (U
: RT_Unit_Table_Record
;
796 N
: Node_Id
) return Node_Id
is
802 Nam
:= New_Reference_To
(U
.Entity
, Standard_Location
);
803 Scop
:= Scope
(U
.Entity
);
805 if Nkind
(N
) = N_Defining_Program_Unit_Name
then
806 while Scop
/= Standard_Standard
loop
808 Make_Expanded_Name
(Standard_Location
,
809 Chars
=> Chars
(U
.Entity
),
810 Prefix
=> New_Reference_To
(Scop
, Standard_Location
),
811 Selector_Name
=> Nam
);
812 Set_Entity
(Nam
, U
.Entity
);
814 Scop
:= Scope
(Scop
);
825 procedure Maybe_Add_With
(U
: in out RT_Unit_Table_Record
) is
827 -- We do not need to generate a with_clause for a call issued from
828 -- RTE_Component_Available. However, for CodePeer, we need these
829 -- additional with's, because for a sequence like "if RTE_Available (X)
830 -- then ... RTE (X)" the RTE call fails to create some necessary with's.
832 if RTE_Available_Call
and not Generate_SCIL
then
836 -- Avoid creating directly self-referential with clauses
838 if Current_Sem_Unit
= U
.Unum
then
842 -- Add the with_clause, if we have not already added an implicit with
843 -- for this unit to the current compilation unit.
846 LibUnit
: constant Node_Id
:= Unit
(Cunit
(U
.Unum
));
851 Clause
:= U
.First_Implicit_With
;
852 while Present
(Clause
) loop
853 if Parent
(Clause
) = Cunit
(Current_Sem_Unit
) then
857 Clause
:= Next_Implicit_With
(Clause
);
861 Make_With_Clause
(Standard_Location
,
864 (U
, Defining_Unit_Name
(Specification
(LibUnit
))));
866 Set_Library_Unit
(Withn
, Cunit
(U
.Unum
));
867 Set_Corresponding_Spec
(Withn
, U
.Entity
);
868 Set_First_Name
(Withn
, True);
869 Set_Implicit_With
(Withn
, True);
870 Set_Next_Implicit_With
(Withn
, U
.First_Implicit_With
);
872 U
.First_Implicit_With
:= Withn
;
874 Mark_Rewrite_Insertion
(Withn
);
875 Append
(Withn
, Context_Items
(Cunit
(Current_Sem_Unit
)));
876 Check_Restriction_No_Dependence
(Name
(Withn
), Current_Error_Node
);
880 ------------------------
881 -- Output_Entity_Name --
882 ------------------------
884 procedure Output_Entity_Name
(Id
: RE_Id
; Msg
: String) is
885 M
: String (1 .. 2048);
887 -- M (1 .. P) is current message to be output
889 RE_Image
: constant String := RE_Id
'Image (Id
);
896 M
(1 .. 9) := "\entity """;
899 -- Add unit name to message, excluding %s or %b at end
901 Get_Name_String
(Get_Unit_Name
(RE_Unit_Table
(Id
)));
902 Name_Len
:= Name_Len
- 2;
903 Set_Casing
(Mixed_Case
);
904 M
(P
+ 1 .. P
+ Name_Len
) := Name_Buffer
(1 .. Name_Len
);
907 -- Add a qualifying period
912 -- Add entity name and closing quote to message
914 Name_Len
:= RE_Image
'Length - 3;
915 Name_Buffer
(1 .. Name_Len
) := RE_Image
(4 .. RE_Image
'Length);
916 Set_Casing
(Mixed_Case
);
917 M
(P
+ 1 .. P
+ Name_Len
) := Name_Buffer
(1 .. Name_Len
);
926 M
(P
+ 1 .. P
+ Msg
'Length) := Msg
;
929 -- Output message at current error node location
931 RTE_Error_Msg
(M
(1 .. P
));
932 end Output_Entity_Name
;
938 function RE_Chars
(E
: RE_Id
) return Name_Id
is
939 RE_Name_Chars
: constant String := RE_Id
'Image (E
);
942 -- Copy name skipping initial RE_ or RO_XX characters
944 if RE_Name_Chars
(1 .. 2) = "RE" then
945 for J
in 4 .. RE_Name_Chars
'Last loop
946 Name_Buffer
(J
- 3) := Fold_Lower
(RE_Name_Chars
(J
));
949 Name_Len
:= RE_Name_Chars
'Length - 3;
952 for J
in 7 .. RE_Name_Chars
'Last loop
953 Name_Buffer
(J
- 6) := Fold_Lower
(RE_Name_Chars
(J
));
956 Name_Len
:= RE_Name_Chars
'Length - 6;
966 function RTE
(E
: RE_Id
) return Entity_Id
is
967 U_Id
: constant RTU_Id
:= RE_Unit_Table
(E
);
968 U
: RT_Unit_Table_Record
renames RT_Unit_Table
(U_Id
);
974 -- The following flag is used to disable front-end inlining when RTE
975 -- is invoked. This prevents the analysis of other runtime bodies when
976 -- a particular spec is loaded through Rtsfind. This is both efficient,
977 -- and it prevents spurious visibility conflicts between use-visible
978 -- user entities, and entities in run-time packages.
980 Save_Front_End_Inlining
: Boolean;
983 -- Reject programs that make use of distribution features not supported
984 -- on the current target. Also check that the PCS is compatible with
985 -- the code generator version. On such targets (VMS, Vxworks, others?)
986 -- we provide a minimal body for System.Rpc that only supplies an
987 -- implementation of Partition_Id.
989 function Find_Local_Entity
(E
: RE_Id
) return Entity_Id
;
990 -- This function is used when entity E is in this compilation's main
991 -- unit. It gets the value from the already compiled declaration.
997 procedure Check_RPC
is
999 -- Bypass this check if debug flag -gnatdR set
1001 if Debug_Flag_RR
then
1005 -- Otherwise we need the check if we are going after one of the
1006 -- critical entities in System.RPC / System.Partition_Interface.
1012 E
= RE_Params_Stream_Type
1014 E
= RE_Request_Access
1016 -- If generating RCI stubs, check that we have a real PCS
1018 if (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
1020 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
1021 and then Get_PCS_Name
= Name_No_DSA
1024 Write_Str
("distribution feature not supported");
1026 raise Unrecoverable_Error
;
1028 -- In all cases, check Exp_Dist and System.Partition_Interface
1031 elsif Get_PCS_Version
/=
1032 Exp_Dist
.PCS_Version_Number
(Get_PCS_Name
)
1035 Write_Str
("PCS version mismatch: expander ");
1036 Write_Int
(Exp_Dist
.PCS_Version_Number
(Get_PCS_Name
));
1037 Write_Str
(", PCS (");
1038 Write_Name
(Get_PCS_Name
);
1040 Write_Int
(Get_PCS_Version
);
1042 raise Unrecoverable_Error
;
1047 -----------------------
1048 -- Find_Local_Entity --
1049 -----------------------
1051 function Find_Local_Entity
(E
: RE_Id
) return Entity_Id
is
1052 RE_Str
: constant String := RE_Id
'Image (E
);
1056 Save_Nam
: constant String := Name_Buffer
(1 .. Name_Len
);
1057 -- Save name buffer and length over call
1060 Name_Len
:= Natural'Max (0, RE_Str
'Length - 3);
1061 Name_Buffer
(1 .. Name_Len
) :=
1062 RE_Str
(RE_Str
'First + 3 .. RE_Str
'Last);
1065 Ent
:= Entity_Id
(Get_Name_Table_Info
(Nam
));
1067 Name_Len
:= Save_Nam
'Length;
1068 Name_Buffer
(1 .. Name_Len
) := Save_Nam
;
1071 end Find_Local_Entity
;
1073 -- Start of processing for RTE
1076 -- Doing a rtsfind in system.ads is special, as we cannot do this
1077 -- when compiling System itself. So if we are compiling system then
1078 -- we should already have acquired and processed the declaration
1079 -- of the entity. The test is to see if this compilation's main unit
1080 -- is System. If so, return the value from the already compiled
1081 -- declaration and otherwise do a regular find.
1083 -- Not pleasant, but these kinds of annoying recursion when
1084 -- writing an Ada compiler in Ada have to be broken somewhere!
1086 if Present
(Main_Unit_Entity
)
1087 and then Chars
(Main_Unit_Entity
) = Name_System
1088 and then Analyzed
(Main_Unit_Entity
)
1089 and then not Is_Child_Unit
(Main_Unit_Entity
)
1091 return Check_CRT
(E
, Find_Local_Entity
(E
));
1094 Save_Front_End_Inlining
:= Front_End_Inlining
;
1095 Front_End_Inlining
:= False;
1097 -- Load unit if unit not previously loaded
1099 if No
(RE_Table
(E
)) then
1100 Load_RTU
(U_Id
, Id
=> E
);
1101 Lib_Unit
:= Unit
(Cunit
(U
.Unum
));
1103 -- In the subprogram case, we are all done, the entity we want
1104 -- is the entity for the subprogram itself. Note that we do not
1105 -- bother to check that it is the entity that was requested.
1106 -- the only way that could fail to be the case is if runtime is
1107 -- hopelessly misconfigured, and it isn't worth testing for this.
1109 if Nkind
(Lib_Unit
) = N_Subprogram_Declaration
then
1110 RE_Table
(E
) := U
.Entity
;
1112 -- Otherwise we must have the package case. First check package
1113 -- entity itself (e.g. RTE_Name for System.Interrupts.Name)
1116 pragma Assert
(Nkind
(Lib_Unit
) = N_Package_Declaration
);
1117 Ename
:= RE_Chars
(E
);
1119 -- First we search the package entity chain. If the package
1120 -- only has a limited view, scan the corresponding list of
1121 -- incomplete types.
1123 if From_Limited_With
(U
.Entity
) then
1124 Pkg_Ent
:= First_Entity
(Limited_View
(U
.Entity
));
1126 Pkg_Ent
:= First_Entity
(U
.Entity
);
1129 while Present
(Pkg_Ent
) loop
1130 if Ename
= Chars
(Pkg_Ent
) then
1131 RE_Table
(E
) := Pkg_Ent
;
1136 Next_Entity
(Pkg_Ent
);
1139 -- If we did not find the entity in the package entity chain,
1140 -- then check if the package entity itself matches. Note that
1141 -- we do this check after searching the entity chain, since
1142 -- the rule is that in case of ambiguity, we prefer the entity
1143 -- defined within the package, rather than the package itself.
1145 if Ename
= Chars
(U
.Entity
) then
1146 RE_Table
(E
) := U
.Entity
;
1149 -- If we didn't find the entity we want, something is wrong.
1150 -- We just leave RE_Table (E) set to Empty and the appropriate
1151 -- action will be taken by Check_CRT when we exit.
1159 Front_End_Inlining
:= Save_Front_End_Inlining
;
1160 return Check_CRT
(E
, RE_Table
(E
));
1167 function RTE_Available
(E
: RE_Id
) return Boolean is
1169 pragma Warnings
(Off
, Dummy
);
1173 Save_RTE_Available_Call
: constant Boolean := RTE_Available_Call
;
1174 Save_RTE_Is_Available
: constant Boolean := RTE_Is_Available
;
1175 -- These are saved recursively because the call to load a unit
1176 -- caused by an upper level call may perform a recursive call
1177 -- to this routine during analysis of the corresponding unit.
1180 RTE_Available_Call
:= True;
1181 RTE_Is_Available
:= True;
1183 Result
:= RTE_Is_Available
;
1184 RTE_Available_Call
:= Save_RTE_Available_Call
;
1185 RTE_Is_Available
:= Save_RTE_Is_Available
;
1189 when RE_Not_Available
=>
1190 RTE_Available_Call
:= Save_RTE_Available_Call
;
1191 RTE_Is_Available
:= Save_RTE_Is_Available
;
1195 --------------------------
1196 -- RTE_Record_Component --
1197 --------------------------
1199 function RTE_Record_Component
(E
: RE_Id
) return Entity_Id
is
1200 U_Id
: constant RTU_Id
:= RE_Unit_Table
(E
);
1201 U
: RT_Unit_Table_Record
renames RT_Unit_Table
(U_Id
);
1204 Found_E
: Entity_Id
;
1206 Pkg_Ent
: Entity_Id
;
1208 -- The following flag is used to disable front-end inlining when
1209 -- RTE_Record_Component is invoked. This prevents the analysis of other
1210 -- runtime bodies when a particular spec is loaded through Rtsfind. This
1211 -- is both efficient, and it prevents spurious visibility conflicts
1212 -- between use-visible user entities, and entities in run-time packages.
1214 Save_Front_End_Inlining
: Boolean;
1217 -- Note: Contrary to subprogram RTE, there is no need to do any special
1218 -- management with package system.ads because it has no record type
1221 Save_Front_End_Inlining
:= Front_End_Inlining
;
1222 Front_End_Inlining
:= False;
1224 -- Load unit if unit not previously loaded
1226 if not Present
(U
.Entity
) then
1227 Load_RTU
(U_Id
, Id
=> E
);
1230 Lib_Unit
:= Unit
(Cunit
(U
.Unum
));
1232 pragma Assert
(Nkind
(Lib_Unit
) = N_Package_Declaration
);
1233 Ename
:= RE_Chars
(E
);
1235 -- Search the entity in the components of record type declarations
1236 -- found in the package entity chain.
1239 Pkg_Ent
:= First_Entity
(U
.Entity
);
1240 Search
: while Present
(Pkg_Ent
) loop
1241 if Is_Record_Type
(Pkg_Ent
) then
1242 E1
:= First_Entity
(Pkg_Ent
);
1243 while Present
(E1
) loop
1244 if Ename
= Chars
(E1
) then
1245 pragma Assert
(not Present
(Found_E
));
1253 Next_Entity
(Pkg_Ent
);
1256 -- If we didn't find the entity we want, something is wrong. The
1257 -- appropriate action will be taken by Check_CRT when we exit.
1261 Front_End_Inlining
:= Save_Front_End_Inlining
;
1262 return Check_CRT
(E
, Found_E
);
1263 end RTE_Record_Component
;
1265 ------------------------------------
1266 -- RTE_Record_Component_Available --
1267 ------------------------------------
1269 function RTE_Record_Component_Available
(E
: RE_Id
) return Boolean is
1271 pragma Warnings
(Off
, Dummy
);
1275 Save_RTE_Available_Call
: constant Boolean := RTE_Available_Call
;
1276 Save_RTE_Is_Available
: constant Boolean := RTE_Is_Available
;
1277 -- These are saved recursively because the call to load a unit
1278 -- caused by an upper level call may perform a recursive call
1279 -- to this routine during analysis of the corresponding unit.
1282 RTE_Available_Call
:= True;
1283 RTE_Is_Available
:= True;
1284 Dummy
:= RTE_Record_Component
(E
);
1285 Result
:= RTE_Is_Available
;
1286 RTE_Available_Call
:= Save_RTE_Available_Call
;
1287 RTE_Is_Available
:= Save_RTE_Is_Available
;
1291 when RE_Not_Available
=>
1292 RTE_Available_Call
:= Save_RTE_Available_Call
;
1293 RTE_Is_Available
:= Save_RTE_Is_Available
;
1295 end RTE_Record_Component_Available
;
1301 procedure RTE_Error_Msg
(Msg
: String) is
1303 if RTE_Available_Call
then
1304 RTE_Is_Available
:= False;
1306 Error_Msg_N
(Msg
, Current_Error_Node
);
1308 -- Bump count of violations if we are in configurable run-time
1309 -- mode and this is not a continuation message.
1311 if Configurable_Run_Time_Mode
and then Msg
(Msg
'First) /= '\' then
1312 Configurable_Run_Time_Violations
:=
1313 Configurable_Run_Time_Violations
+ 1;
1322 function RTU_Entity
(U
: RTU_Id
) return Entity_Id
is
1324 return RT_Unit_Table
(U
).Entity
;
1331 function RTU_Loaded
(U
: RTU_Id
) return Boolean is
1333 return Present
(RT_Unit_Table
(U
).Entity
);
1336 --------------------
1337 -- Set_RTU_Loaded --
1338 --------------------
1340 procedure Set_RTU_Loaded
(N
: Node_Id
) is
1341 Loc
: constant Source_Ptr
:= Sloc
(N
);
1342 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1343 Uname
: constant Unit_Name_Type
:= Unit_Name
(Unum
);
1344 E
: constant Entity_Id
:=
1345 Defining_Entity
(Unit
(Cunit
(Unum
)));
1347 pragma Assert
(Is_Predefined_File_Name
(Unit_File_Name
(Unum
)));
1349 -- Loop through entries in RTU table looking for matching entry
1351 for U_Id
in RTU_Id
'Range loop
1353 -- Here we have a match
1355 if Get_Unit_Name
(U_Id
) = Uname
then
1357 U
: RT_Unit_Table_Record
renames RT_Unit_Table
(U_Id
);
1358 -- The RT_Unit_Table entry that may need updating
1361 -- If entry is not set, set it now, and indicate that it was
1362 -- loaded through an explicit context clause.
1364 if No
(U
.Entity
) then
1366 Uname
=> Get_Unit_Name
(U_Id
),
1368 First_Implicit_With
=> Empty
);
1377 --------------------
1378 -- Text_IO_Kludge --
1379 --------------------
1381 procedure Text_IO_Kludge
(Nam
: Node_Id
) is
1384 type Name_Map_Type
is array (Text_IO_Package_Name
) of RTU_Id
;
1386 Name_Map
: constant Name_Map_Type
:= Name_Map_Type
'(
1387 Name_Decimal_IO => Ada_Text_IO_Decimal_IO,
1388 Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO,
1389 Name_Fixed_IO => Ada_Text_IO_Fixed_IO,
1390 Name_Float_IO => Ada_Text_IO_Float_IO,
1391 Name_Integer_IO => Ada_Text_IO_Integer_IO,
1392 Name_Modular_IO => Ada_Text_IO_Modular_IO);
1394 Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'(
1395 Name_Decimal_IO
=> Ada_Wide_Text_IO_Decimal_IO
,
1396 Name_Enumeration_IO
=> Ada_Wide_Text_IO_Enumeration_IO
,
1397 Name_Fixed_IO
=> Ada_Wide_Text_IO_Fixed_IO
,
1398 Name_Float_IO
=> Ada_Wide_Text_IO_Float_IO
,
1399 Name_Integer_IO
=> Ada_Wide_Text_IO_Integer_IO
,
1400 Name_Modular_IO
=> Ada_Wide_Text_IO_Modular_IO
);
1402 Wide_Wide_Name_Map
: constant Name_Map_Type
:= Name_Map_Type
'(
1403 Name_Decimal_IO => Ada_Wide_Wide_Text_IO_Decimal_IO,
1404 Name_Enumeration_IO => Ada_Wide_Wide_Text_IO_Enumeration_IO,
1405 Name_Fixed_IO => Ada_Wide_Wide_Text_IO_Fixed_IO,
1406 Name_Float_IO => Ada_Wide_Wide_Text_IO_Float_IO,
1407 Name_Integer_IO => Ada_Wide_Wide_Text_IO_Integer_IO,
1408 Name_Modular_IO => Ada_Wide_Wide_Text_IO_Modular_IO);
1411 -- Unit to be loaded, from one of the above maps
1414 -- Nothing to do if name is not an identifier or a selected component
1415 -- whose selector_name is an identifier.
1417 if Nkind (Nam) = N_Identifier then
1418 Chrs := Chars (Nam);
1420 elsif Nkind (Nam) = N_Selected_Component
1421 and then Nkind (Selector_Name (Nam)) = N_Identifier
1423 Chrs := Chars (Selector_Name (Nam));
1429 -- Nothing to do if name is not one of the Text_IO subpackages
1430 -- Otherwise look through loaded units, and if we find Text_IO
1431 -- or [Wide_]Wide_Text_IO already loaded, then load the proper child.
1433 if Chrs in Text_IO_Package_Name then
1434 for U in Main_Unit .. Last_Unit loop
1435 Get_Name_String (Unit_File_Name (U));
1437 if Name_Len = 12 then
1439 -- Here is where we do the loads if we find one of the units
1440 -- Ada.Text_IO or Ada.[Wide_]Wide_Text_IO. An interesting
1441 -- detail is that these units may already be used (i.e. their
1442 -- In_Use flags may be set). Normally when the In_Use flag is
1443 -- set, the Is_Potentially_Use_Visible flag of all entities in
1444 -- the package is set, but the new entity we are mysteriously
1445 -- adding was not there to have its flag set at the time. So
1446 -- that's why we pass the extra parameter to RTU_Find, to make
1447 -- sure the flag does get set now. Given that those generic
1448 -- packages are in fact child units, we must indicate that
1449 -- they are visible.
1451 if Name_Buffer (1 .. 12) = "a-textio.ads" then
1452 To_Load := Name_Map (Chrs);
1454 elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then
1455 To_Load := Wide_Name_Map (Chrs);
1457 elsif Name_Buffer (1 .. 12) = "a-ztexio.ads" then
1458 To_Load := Wide_Wide_Name_Map (Chrs);
1464 Load_RTU (To_Load, Use_Setting => In_Use (Cunit_Entity (U)));
1465 Set_Is_Visible_Lib_Unit (RT_Unit_Table (To_Load).Entity);
1467 -- Prevent creation of an implicit 'with' from (for example)
1468 -- Ada.Wide_Text_IO.Integer_IO to Ada.Text_IO.Integer_IO,
1469 -- because these could create cycles. First check whether the
1470 -- simple names match ("integer_io" = "integer_io"), and then
1471 -- check whether the parent is indeed one of the
1472 -- [[Wide_]Wide_]Text_IO packages.
1474 if Chrs = Chars (Cunit_Entity (Current_Sem_Unit)) then
1476 Parent_Name : constant Unit_Name_Type :=
1477 Get_Parent_Spec_Name
1478 (Unit_Name (Current_Sem_Unit));
1481 if Parent_Name /= No_Unit_Name then
1482 Get_Name_String (Parent_Name);
1485 P : String renames Name_Buffer (1 .. Name_Len);
1487 if P = "ada.text_io%s" or else
1488 P = "ada.wide_text_io%s" or else
1489 P = "ada.wide_wide_text_io%s"
1498 -- Add an implicit with clause from the current unit to the
1499 -- [[Wide_]Wide_]Text_IO child (if necessary).
1501 Maybe_Add_With (RT_Unit_Table (To_Load));
1509 -- Generate error message if run-time unit not available
1511 when RE_Not_Available =>
1512 Error_Msg_N ("& not available", Nam);