1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                                  L I B                                   --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
10--                                                                          --
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.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This package contains routines for accessing and outputting the library
33--  information. It contains the routine to load subsidiary units.
34
35with Alloc;
36with Namet; use Namet;
37with Table;
38with Types; use Types;
39
40package Lib is
41
42   type Unit_Ref_Table is array (Pos range <>) of Unit_Number_Type;
43   --  Type to hold list of indirect references to unit number table
44
45   type Compiler_State_Type is (Parsing, Analyzing);
46   Compiler_State : Compiler_State_Type;
47   --  Indicates current state of compilation. This is used to implement the
48   --  function In_Extended_Main_Source_Unit.
49
50   Parsing_Main_Extended_Source : Boolean := False;
51   --  Set True if we are currently parsing a file that is part of the main
52   --  extended source (the main unit, its spec, or one of its subunits). This
53   --  flag to implement In_Extended_Main_Source_Unit.
54
55   Analysing_Subunit_Of_Main : Boolean := False;
56   --  Set to True when analyzing a subunit of the main source. When True, if
57   --  the subunit is preprocessed and -gnateG is specified, then the
58   --  preprocessed file (.prep) is written.
59
60   --------------------------------------------
61   -- General Approach to Library Management --
62   --------------------------------------------
63
64   --  As described in GNote #1, when a unit is compiled, all its subsidiary
65   --  units are recompiled, including the following:
66
67   --    (a) Corresponding spec for a body
68   --    (b) Parent spec of a child library spec
69   --    (d) With'ed specs
70   --    (d) Parent body of a subunit
71   --    (e) Subunits corresponding to any specified stubs
72   --    (f) Bodies of inlined subprograms that are called
73   --    (g) Bodies of generic subprograms or packages that are instantiated
74   --    (h) Bodies of packages containing either of the above two items
75   --    (i) Specs and bodies of runtime units
76   --    (j) Parent specs for with'ed child library units
77
78   --  If a unit is being compiled only for syntax checking, then no subsidiary
79   --  units are loaded, the syntax check applies only to the main unit,
80   --  i.e. the one contained in the source submitted to the library.
81
82   --  If a unit is being compiled for syntax and semantic checking, then only
83   --  cases (a)-(d) loads are performed, since the full semantic checking can
84   --  be carried out without needing (e)-(i) loads. In this case no object
85   --  file, or library information file, is generated, so the missing units
86   --  do not affect the results.
87
88   --  Specifications of library subprograms, subunits, and generic specs
89   --  and bodies, can only be compiled in syntax/semantic checking mode,
90   --  since no code is ever generated directly for these units. In the case
91   --  of subunits, only the compilation of the ultimate parent unit generates
92   --  actual code. If a subunit is submitted to the compiler in syntax/
93   --  semantic checking mode, the parent (or parents in the nested case) are
94   --  semantically checked only up to the point of the corresponding stub.
95
96   --  If code is being generated, then all the above units are required,
97   --  although the need for bodies of inlined procedures can be suppressed
98   --  by the use of a switch that sets the mode to ignore pragma Inline
99   --  statements.
100
101   --  The two main sections of the front end, Par and Sem, are recursive.
102   --  Compilation proceeds unit by unit making recursive calls as necessary.
103   --  The process is controlled from the GNAT main program, which makes calls
104   --  to Par and Sem sequence for the main unit.
105
106   --  Par parses the given unit, and then, after the parse is complete, uses
107   --  the Par.Load subprogram to load all its subsidiary units in categories
108   --  (a)-(d) above, installing pointers to the loaded units in the parse
109   --  tree, as described in a later section of this spec. If any of these
110   --  required units is missing, a fatal error is signalled, so that no
111   --  attempt is made to run Sem in such cases, since it is assumed that
112   --  too many cascaded errors would result, and the confusion would not
113   --  be helpful.
114
115   --  Following the call to Par on the main unit, the entire tree of required
116   --  units is thus loaded, and Sem is called on the main unit. The parameter
117   --  passed to Sem is the unit to be analyzed. The visibility table, which
118   --  is a single global structure, starts out containing only the entries
119   --  for the visible entities in Standard. Every call to Sem establishes a
120   --  new scope stack table, pushing an entry for Standard on entry to provide
121   --  the proper initial scope environment.
122
123   --  Sem first proceeds to perform semantic analysis on the currently loaded
124   --  units as follows:
125
126   --    In the case of a body (case (a) above), Sem analyzes the corresponding
127   --    spec, using a recursive call to Sem. As is always expected to be the
128   --    case with calls to Sem, any entities installed in the visibility table
129   --    are removed on exit from Sem, so that these entities have to be
130   --    reinstalled on return to continue the analysis of the body which of
131   --    course needs visibility of these entities.
132   --
133   --    In the case of the parent of a child spec (case (b) above), a similar
134   --    call is made to Sem to analyze the parent. Again, on return, the
135   --    entities from the analyzed parent spec have to be installed in the
136   --    visibility table of the caller (the child unit), which must have
137   --    visibility to the entities in its parent spec.
138
139   --    For with'ed specs (case (c) above), a recursive call to Sem is made
140   --    to analyze each spec in turn. After all the spec's have been analyzed,
141   --    but not till that point, the entities from all the with'ed units are
142   --    reinstalled in the visibility table so that the caller can proceed
143   --    with the analysis of the unit doing the with's with the necessary
144   --    entities made either potentially use visible or visible by selection
145   --    as needed.
146
147   --    Case (d) arises when Sem is passed a subunit to analyze. This means
148   --    that the main unit is a subunit, and the unit passed to Sem is either
149   --    the main unit, or one of its ancestors that is still a subunit. Since
150   --    analysis must start at the top of the tree, Sem essentially cancels
151   --    the current call by immediately making a call to analyze the parent
152   --    (when this call is finished it immediately returns, so logically this
153   --    call is like a goto). The subunit will then be analyzed at the proper
154   --    time as described for the stub case. Note that we also turn off the
155   --    indication that code should be generated in this case, since the only
156   --    time we generate code for subunits is when compiling the main parent.
157
158   --    Case (e), subunits corresponding to stubs, are handled as the stubs
159   --    are encountered. There are three sub-cases:
160
161   --      If the subunit has already been loaded, then this means that the
162   --      main unit was a subunit, and we are back on our way down to it
163   --      after following the initial processing described for case (d).
164   --      In this case we analyze this particular subunit, as described
165   --      for the case where we are generating code, but when we get back
166   --      we are all done, since the rest of the parent is irrelevant. To
167   --      get out of the parent, we raise the exception Subunit_Found, which
168   --      is handled at the outer level of Sem.
169
170   --      The cases where the subunit has not already been loaded correspond
171   --      to cases where the main unit was a parent. In this case the action
172   --      depends on whether or not we are generating code. If we are not
173   --      generating code, then this is the case where we can simply ignore
174   --      the subunit, since in checking mode we don't even want to insist
175   --      that the subunit exist, much less waste time checking it.
176
177   --      If we are generating code, then we need to load and analyze
178   --      all subunits. This is achieved with a call to Lib.Load to load
179   --      and parse the unit, followed by processing that installs the
180   --      context clause of the subunit, analyzes the subunit, and then
181   --      removes the context clause (from the visibility chains of the
182   --      parent). Note that we do *not* do a recursive call to Sem in
183   --      this case, precisely because we need to do the analysis of the
184   --      subunit with the current visibility table and scope stack.
185
186   --    Case (f) applies only to subprograms for which a pragma Inline is
187   --    given, providing that the compiler is operating in the mode where
188   --    pragma Inline's are activated. When the expander encounters a call
189   --    to such a subprogram, it loads the body of the subprogram if it has
190   --    not already been loaded, and calls Sem to process it.
191
192   --    Case (g) is similar to case (f), except that the body of a generic
193   --    is unconditionally required, regardless of compiler mode settings.
194   --    As in the subprogram case, when the expander encounters a generic
195   --    instantiation, it loads the generic body of the subprogram if it
196   --    has not already been loaded, and calls Sem to process it.
197
198   --    Case (h) arises when a package contains either an inlined subprogram
199   --    which is called, or a generic which is instantiated. In this case the
200   --    body of the package must be loaded and analyzed with a call to Sem.
201
202   --    Case (i) is handled by adding implicit with clauses to the context
203   --    clauses of all units that potentially reference the relevant runtime
204   --    entities. Note that since we have the full set of units available,
205   --    the parser can always determine the set of runtime units that is
206   --    needed. These with clauses do not have associated use clauses, so
207   --    all references to the entities must be by selection. Once the with
208   --    clauses have been added, subsequent processing is as for normal
209   --    with clauses.
210
211   --    Case (j) is also handled by adding appropriate implicit with clauses
212   --    to any unit that withs a child unit. Again there is no use clause,
213   --    and subsequent processing proceeds as for an explicit with clause.
214
215   --  Sem thus completes the loading of all required units, except those
216   --  required for inline subprogram bodies or inlined generics. If any
217   --  of these load attempts fails, then the expander will not be called,
218   --  even if code was to be generated. If the load attempts all succeed
219   --  then the expander is called, though the attempt to generate code may
220   --  still fail if an error occurs during a load attempt for an inlined
221   --  body or a generic body.
222
223   -------------------------------------------
224   -- Special Handling of Subprogram Bodies --
225   -------------------------------------------
226
227   --  A subprogram body (in an adb file) may stand for both a spec and a body.
228   --  A simple model (and one that was adopted through version 2.07) is simply
229   --  to assume that such an adb file acts as its own spec if no ads file is
230   --  is present.
231
232   --  However, this is not correct. RM 10.1.4(4) requires that such a body
233   --  act as a spec unless a subprogram declaration of the same name is
234   --  already present. The correct interpretation of this in GNAT library
235   --  terms is to ignore an existing ads file of the same name unless this
236   --  ads file contains a subprogram declaration with the same name.
237
238   --  If there is an ads file with a unit other than a subprogram declaration
239   --  with the same name, then a fatal message is output, noting that this
240   --  irrelevant file must be deleted before the body can be compiled. See
241   --  ACVC test CA1020D to see how this processing is required.
242
243   -----------------
244   -- Global Data --
245   -----------------
246
247   Current_Sem_Unit : Unit_Number_Type := Main_Unit;
248   --  Unit number of unit currently being analyzed/expanded. This is set when
249   --  ever a new unit is entered, saving and restoring the old value, so that
250   --  it always reflects the unit currently being analyzed. The initial value
251   --  of Main_Unit ensures that a proper value is set initially, and in
252   --  particular for analysis of configuration pragmas in gnat.adc.
253
254   Main_Unit_Entity : Entity_Id;
255   --  Entity of main unit, same as Cunit_Entity (Main_Unit) except where
256   --  Main_Unit is a body with a separate spec, in which case it is the
257   --  entity for the spec.
258
259   -----------------
260   -- Units Table --
261   -----------------
262
263   --  The units table has an entry for each unit (source file) read in by the
264   --  current compilation. The table is indexed by the unit number value,
265   --  The first entry in the table, subscript Main_Unit, is for the main file.
266   --  Each entry in this units table contains the following data.
267
268   --    Unit_File_Name
269   --      The name of the source file containing the unit. Set when the entry
270   --      is created by a call to Lib.Load, and then cannot be changed.
271
272   --    Source_Index
273   --      The index in the source file table of the corresponding source file.
274   --      Set when the entry is created by a call to Lib.Load and then cannot
275   --      be changed.
276
277   --    Munit_Index
278   --      The index of the unit within the file for multiple unit per file
279   --      mode. Set to zero in normal single unit per file mode.
280
281   --    Error_Location
282   --      This is copied from the Sloc field of the Enode argument passed
283   --      to Load_Unit. It refers to the enclosing construct which caused
284   --      this unit to be loaded, e.g. most typically the with clause that
285   --      referenced the unit, and is used for error handling in Par.Load.
286
287   --    Expected_Unit
288   --      This is the expected unit name for a file other than the main unit,
289   --      since these are cases where we load the unit using Lib.Load and we
290   --      know the unit that is expected. It must be the same as Unit_Name
291   --      if it is set (see test in Par.Load). Expected_Unit is set to
292   --      No_Name for the main unit.
293
294   --    Unit_Name
295   --      The name of the unit. Initialized to No_Name by Lib.Load, and then
296   --      set by the parser when the unit is parsed to the unit name actually
297   --      found in the file (which should, in the absence of errors) be the
298   --      same name as Expected_Unit.
299
300   --    Cunit
301   --      Pointer to the N_Compilation_Unit node. Initially set to Empty by
302   --      Lib.Load, and then reset to the required node by the parser when
303   --      the unit is parsed.
304
305   --    Cunit_Entity
306   --      Pointer to the entity node for the compilation unit. Initially set
307   --      to Empty by Lib.Load, and then reset to the required entity by the
308   --      parser when the unit is parsed.
309
310   --    Dependency_Num
311   --      This is the number of the unit within the generated dependency
312   --      lines (D lines in the ALI file) which are sorted into alphabetical
313   --      order. The number is ones origin, so a value of 2 refers to the
314   --      second generated D line. The Dependency_Number values are set
315   --      as the D lines are generated, and are used to generate proper
316   --      unit references in the generated xref information and SCO output.
317
318   --    Dynamic_Elab
319   --      A flag indicating if this unit was compiled with dynamic elaboration
320   --      checks specified (as the result of using the -gnatE compilation
321   --      option or a pragma Elaboration_Checks (Dynamic).
322
323   --    Fatal_Error
324   --      A flag that is initialized to False, and gets set to True if a fatal
325   --      error occurs during the processing of a unit. A fatal error is one
326   --      defined as serious enough to stop the next phase of the compiler
327   --      from running (i.e. fatal error during parsing stops semantics,
328   --      fatal error during semantics stops code generation). Note that
329   --      currently, errors of any kind cause Fatal_Error to be set, but
330   --      eventually perhaps only errors labeled as Fatal_Errors should be
331   --      this severe if we decide to try Sem on sources with minor errors.
332
333   --    Generate_Code
334   --      This flag is set True for all units in the current file for which
335   --      code is to be generated. This includes the unit explicitly compiled,
336   --      together with its specification, and any subunits.
337
338   --    Has_RACW
339   --      A Boolean flag, initially set to False when a unit entry is created,
340   --      and set to True if the unit defines a remote access to class wide
341   --      (RACW) object. This is used for controlling generation of the RA
342   --      attribute in the ali file.
343
344   --    Is_Compiler_Unit
345   --      A Boolean flag, initially set False by default, set to True if a
346   --      pragma Compiler_Unit appears in the unit.
347
348   --    Ident_String
349   --      N_String_Literal node from a valid pragma Ident that applies to
350   --      this unit. If no Ident pragma applies to the unit, then Empty.
351
352   --    Loading
353   --      A flag that is used to catch circular WITH dependencies. It is set
354   --      True when an entry is initially created in the file table, and set
355   --      False when the load is completed, or ends with an error.
356
357   --    Main_Priority
358   --      This field is used to indicate the priority of a possible main
359   --      program, as set by a pragma Priority. A value of -1 indicates
360   --      that the default priority is to be used (and is also used for
361   --      entries that do not correspond to possible main programs).
362
363   --    Main_CPU
364   --      This field is used to indicate the affinity of a possible main
365   --      program, as set by a pragma CPU. A value of -1 indicates
366   --      that the default affinity is to be used (and is also used for
367   --      entries that do not correspond to possible main programs).
368
369   --    Has_Allocator
370   --      This flag is set if a subprogram unit has an allocator after the
371   --      BEGIN (it is used to set the AB flag in the M ALI line).
372
373   --    OA_Setting
374   --      This is a character field containing L if Optimize_Alignment mode
375   --      was set locally, and O/T/S for Off/Time/Space default if not.
376
377   --    Serial_Number
378   --      This field holds a serial number used by New_Internal_Name to
379   --      generate unique temporary numbers on a unit by unit basis. The
380   --      only access to this field is via the Increment_Serial_Number
381   --      routine which increments the current value and returns it. This
382   --      serial number is separate for each unit.
383
384   --    Version
385   --      This field holds the version of the unit, which is computed as
386   --      the exclusive or of the checksums of this unit, and all its
387   --      semantically dependent units. Access to the version number field
388   --      is not direct, but is done through the routines described below.
389   --      When a unit table entry is created, this field is initialized to
390   --      the checksum of the corresponding source file. Version_Update is
391   --      then called to reflect the contributions of any unit on which this
392   --      unit is semantically dependent.
393
394   --  The units table is reset to empty at the start of the compilation of
395   --  each main unit by Lib.Initialize. Entries are then added by calls to
396   --  the Lib.Load procedure. The following subprograms are used to access
397   --  and modify entries in the Units table. Individual entries are accessed
398   --  using a unit number value which ranges from Main_Unit (the first entry,
399   --  which is always for the current main unit) to Last_Unit.
400
401   Default_Main_Priority : constant Int := -1;
402   --  Value used in Main_Priority field to indicate default main priority
403
404   Default_Main_CPU : constant Int := -1;
405   --  Value used in Main_CPU field to indicate default main affinity
406
407   function Cunit            (U : Unit_Number_Type) return Node_Id;
408   function Cunit_Entity     (U : Unit_Number_Type) return Entity_Id;
409   function Dependency_Num   (U : Unit_Number_Type) return Nat;
410   function Dynamic_Elab     (U : Unit_Number_Type) return Boolean;
411   function Error_Location   (U : Unit_Number_Type) return Source_Ptr;
412   function Expected_Unit    (U : Unit_Number_Type) return Unit_Name_Type;
413   function Fatal_Error      (U : Unit_Number_Type) return Boolean;
414   function Generate_Code    (U : Unit_Number_Type) return Boolean;
415   function Ident_String     (U : Unit_Number_Type) return Node_Id;
416   function Has_Allocator    (U : Unit_Number_Type) return Boolean;
417   function Has_RACW         (U : Unit_Number_Type) return Boolean;
418   function Is_Compiler_Unit (U : Unit_Number_Type) return Boolean;
419   function Loading          (U : Unit_Number_Type) return Boolean;
420   function Main_CPU         (U : Unit_Number_Type) return Int;
421   function Main_Priority    (U : Unit_Number_Type) return Int;
422   function Munit_Index      (U : Unit_Number_Type) return Nat;
423   function OA_Setting       (U : Unit_Number_Type) return Character;
424   function Source_Index     (U : Unit_Number_Type) return Source_File_Index;
425   function Unit_File_Name   (U : Unit_Number_Type) return File_Name_Type;
426   function Unit_Name        (U : Unit_Number_Type) return Unit_Name_Type;
427   --  Get value of named field from given units table entry
428
429   procedure Set_Cunit            (U : Unit_Number_Type; N : Node_Id);
430   procedure Set_Cunit_Entity     (U : Unit_Number_Type; E : Entity_Id);
431   procedure Set_Dynamic_Elab     (U : Unit_Number_Type; B : Boolean := True);
432   procedure Set_Error_Location   (U : Unit_Number_Type; W : Source_Ptr);
433   procedure Set_Fatal_Error      (U : Unit_Number_Type; B : Boolean := True);
434   procedure Set_Generate_Code    (U : Unit_Number_Type; B : Boolean := True);
435   procedure Set_Has_RACW         (U : Unit_Number_Type; B : Boolean := True);
436   procedure Set_Has_Allocator    (U : Unit_Number_Type; B : Boolean := True);
437   procedure Set_Is_Compiler_Unit (U : Unit_Number_Type; B : Boolean := True);
438   procedure Set_Ident_String     (U : Unit_Number_Type; N : Node_Id);
439   procedure Set_Loading          (U : Unit_Number_Type; B : Boolean := True);
440   procedure Set_Main_CPU         (U : Unit_Number_Type; P : Int);
441   procedure Set_Main_Priority    (U : Unit_Number_Type; P : Int);
442   procedure Set_OA_Setting       (U : Unit_Number_Type; C : Character);
443   procedure Set_Unit_Name        (U : Unit_Number_Type; N : Unit_Name_Type);
444   --  Set value of named field for given units table entry. Note that we
445   --  do not have an entry for each possible field, since some of the fields
446   --  can only be set by specialized interfaces (defined below).
447
448   function Version_Get (U : Unit_Number_Type) return Word_Hex_String;
449   --  Returns the version as a string with 8 hex digits (upper case letters)
450
451   function Last_Unit return Unit_Number_Type;
452   --  Unit number of last allocated unit
453
454   function Num_Units return Nat;
455   --  Number of units currently in unit table
456
457   procedure Remove_Unit (U : Unit_Number_Type);
458   --  Remove unit U from unit table. Currently this is effective only
459   --  if U is the last unit currently stored in the unit table.
460
461   function Entity_Is_In_Main_Unit (E : Entity_Id) return Boolean;
462   --  Returns True if the entity E is declared in the main unit, or, in
463   --  its corresponding spec, or one of its subunits. Entities declared
464   --  within generic instantiations return True if the instantiation is
465   --  itself "in the main unit" by this definition. Otherwise False.
466
467   function Get_Source_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type;
468   pragma Inline (Get_Source_Unit);
469   function Get_Source_Unit (S : Source_Ptr) return Unit_Number_Type;
470   --  Return unit number of file identified by given source pointer value.
471   --  This call must always succeed, since any valid source pointer value
472   --  belongs to some previously loaded module. If the given source pointer
473   --  value is within an instantiation, this function returns the unit number
474   --  of the template, i.e. the unit containing the source code corresponding
475   --  to the given Source_Ptr value. The version taking a Node_Id argument, N,
476   --  simply applies the function to Sloc (N).
477
478   function Get_Code_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type;
479   pragma Inline (Get_Code_Unit);
480   function Get_Code_Unit (S : Source_Ptr) return Unit_Number_Type;
481   --  This is like Get_Source_Unit, except that in the instantiation case,
482   --  it uses the location of the top level instantiation, rather than the
483   --  template, so it returns the unit number containing the code that
484   --  corresponds to the node N, or the source location S.
485
486   function In_Same_Source_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean;
487   pragma Inline (In_Same_Source_Unit);
488   --  Determines if the two nodes or entities N1 and N2 are in the same
489   --  source unit, the criterion being that Get_Source_Unit yields the
490   --  same value for each argument.
491
492   function In_Same_Code_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean;
493   pragma Inline (In_Same_Code_Unit);
494   --  Determines if the two nodes or entities N1 and N2 are in the same
495   --  code unit, the criterion being that Get_Code_Unit yields the same
496   --  value for each argument.
497
498   function In_Same_Extended_Unit (N1, N2 : Node_Or_Entity_Id) return Boolean;
499   pragma Inline (In_Same_Extended_Unit);
500   --  Determines if two nodes or entities N1 and N2 are in the same
501   --  extended unit, where an extended unit is defined as a unit and all
502   --  its subunits (considered recursively, i.e. subunits of subunits are
503   --  included). Returns true if S1 and S2 are in the same extended unit
504   --  and False otherwise.
505
506   function In_Same_Extended_Unit (S1, S2 : Source_Ptr) return Boolean;
507   pragma Inline (In_Same_Extended_Unit);
508   --  Determines if the two source locations S1 and S2 are in the same
509   --  extended unit, where an extended unit is defined as a unit and all
510   --  its subunits (considered recursively, i.e. subunits of subunits are
511   --  included). Returns true if S1 and S2 are in the same extended unit
512   --  and False otherwise.
513
514   function In_Extended_Main_Code_Unit
515     (N : Node_Or_Entity_Id) return Boolean;
516   --  Return True if the node is in the generated code of the extended main
517   --  unit, defined as the main unit, its specification (if any), and all
518   --  its subunits (considered recursively). Units for which this enquiry
519   --  returns True are those for which code will be generated. Nodes from
520   --  instantiations are included in the extended main unit for this call.
521   --  If the main unit is itself a subunit, then the extended main code unit
522   --  includes its parent unit, and the parent unit spec if it is separate.
523
524   function In_Extended_Main_Code_Unit (Loc : Source_Ptr) return Boolean;
525   --  Same function as above, but argument is a source pointer rather
526   --  than a node.
527
528   function In_Extended_Main_Source_Unit
529     (N : Node_Or_Entity_Id) return Boolean;
530   --  Return True if the node is in the source text of the extended main
531   --  unit, defined as the main unit, its specification (if any), and all
532   --  its subunits (considered recursively). Units for which this enquiry
533   --  returns True are those for which code will be generated. This differs
534   --  from In_Extended_Main_Code_Unit only in that instantiations are not
535   --  included for the purposes of this call. If the main unit is itself
536   --  a subunit, then the extended main source unit includes its parent unit,
537   --  and the parent unit spec if it is separate.
538
539   function In_Extended_Main_Source_Unit (Loc : Source_Ptr) return Boolean;
540   --  Same function as above, but argument is a source pointer
541
542   function In_Predefined_Unit (N : Node_Or_Entity_Id) return Boolean;
543   --  Returns True if the given node or entity appears within the source text
544   --  of a predefined unit (i.e. within Ada, Interfaces, System or within one
545   --  of the descendent packages of one of these three packages).
546
547   function In_Predefined_Unit (S : Source_Ptr) return Boolean;
548   --  Same function as above but argument is a source pointer
549
550   function Earlier_In_Extended_Unit (S1, S2 : Source_Ptr) return Boolean;
551   --  Given two Sloc values for which In_Same_Extended_Unit is true, determine
552   --  if S1 appears before S2. Returns True if S1 appears before S2, and False
553   --  otherwise. The result is undefined if S1 and S2 are not in the same
554   --  extended unit. Note: this routine will not give reliable results if
555   --  called after Sprint has been called with -gnatD set.
556
557   function Exact_Source_Name (Loc : Source_Ptr) return String;
558   --  Return name of entity at location Loc exactly as written in the source.
559   --  this includes copying the wide character encodings exactly as they were
560   --  used in the source, so the caller must be aware of the possibility of
561   --  such encodings.
562
563   function Compilation_Switches_Last return Nat;
564   --  Return the count of stored compilation switches
565
566   function Get_Compilation_Switch (N : Pos) return String_Ptr;
567   --  Return the Nth stored compilation switch, or null if less than N
568   --  switches have been stored. Used by ASIS and back ends written in Ada.
569
570   function Get_Cunit_Unit_Number (N : Node_Id) return Unit_Number_Type;
571   --  Return unit number of the unit whose N_Compilation_Unit node is the
572   --  one passed as an argument. This must always succeed since the node
573   --  could not have been built without making a unit table entry.
574
575   function Get_Cunit_Entity_Unit_Number
576     (E : Entity_Id) return Unit_Number_Type;
577   --  Return unit number of the unit whose compilation unit spec entity is
578   --  the one passed as an argument. This must always succeed since the
579   --  entity could not have been built without making a unit table entry.
580
581   function Increment_Serial_Number return Nat;
582   --  Increment Serial_Number field for current unit, and return the
583   --  incremented value.
584
585   procedure Synchronize_Serial_Number;
586   --  This function increments the Serial_Number field for the current unit
587   --  but does not return the incremented value. This is used when there
588   --  is a situation where one path of control increments a serial number
589   --  (using Increment_Serial_Number), and the other path does not and it is
590   --  important to keep the serial numbers synchronized in the two cases (e.g.
591   --  when the references in a package and a client must be kept consistent).
592
593   procedure Replace_Linker_Option_String
594     (S            : String_Id;
595      Match_String : String);
596   --  Replace an existing Linker_Option if the prefix Match_String matches,
597   --  otherwise call Store_Linker_Option_String.
598
599   procedure Store_Compilation_Switch (Switch : String);
600   --  Called to register a compilation switch, either front-end or back-end,
601   --  which may influence the generated output file(s). Switch is the text of
602   --  the switch to store (except that -fRTS gets changed back to --RTS).
603
604   procedure Enable_Switch_Storing;
605   --  Enable registration of switches by Store_Compilation_Switch. Used to
606   --  avoid registering switches added automatically by the gcc driver at the
607   --  beginning of the command line.
608
609   procedure Disable_Switch_Storing;
610   --  Disable registration of switches by Store_Compilation_Switch. Used to
611   --  avoid registering switches added automatically by the gcc driver at the
612   --  end of the command line.
613
614   procedure Store_Linker_Option_String (S : String_Id);
615   --  This procedure is called to register the string from a pragma
616   --  Linker_Option. The argument is the Id of the string to register.
617
618   procedure Store_Note (N : Node_Id);
619   --  This procedure is called to register a pragma N for which a notes
620   --  entry is required.
621
622   procedure Initialize;
623   --  Initialize internal tables
624
625   procedure Lock;
626   --  Lock internal tables before calling back end
627
628   procedure Unlock;
629   --  Unlock internal tables, in cases where the back end needs to modify them
630
631   procedure Tree_Read;
632   --  Initializes internal tables from current tree file using the relevant
633   --  Table.Tree_Read routines.
634
635   procedure Tree_Write;
636   --  Writes out internal tables to current tree file using the relevant
637   --  Table.Tree_Write routines.
638
639   function Is_Loaded (Uname : Unit_Name_Type) return Boolean;
640   --  Determines if unit with given name is already loaded, i.e. there is
641   --  already an entry in the file table with this unit name for which the
642   --  corresponding file was found and parsed. Note that the Fatal_Error flag
643   --  of this entry must be checked before proceeding with further processing.
644
645   procedure Version_Referenced (S : String_Id);
646   --  This routine is called from Exp_Attr to register the use of a Version
647   --  or Body_Version attribute. The argument is the external name used to
648   --  access the version string.
649
650   procedure List (File_Names_Only : Boolean := False);
651   --  Lists units in active library (i.e. generates output consisting of a
652   --  sorted listing of the units represented in File table, except for the
653   --  main unit). If File_Names_Only is set to True, then the list includes
654   --  only file names, and no other information. Otherwise the unit name and
655   --  time stamp are also output. File_Names_Only also restricts the list to
656   --  exclude any predefined files.
657
658   function Generic_May_Lack_ALI (Sfile : File_Name_Type) return Boolean;
659   --  Generic units must be separately compiled. Since we always use
660   --  macro substitution for generics, the resulting object file is a dummy
661   --  one with no code, but the ALI file has the normal form, and we need
662   --  this ALI file so that the binder can work out a correct order of
663   --  elaboration.
664   --
665   --  However, ancient versions of GNAT used to not generate code or ALI
666   --  files for generic units, and this would yield complex order of
667   --  elaboration issues. These were fixed in GNAT 3.10. The support for not
668   --  compiling language-defined library generics was retained nonetheless
669   --  to facilitate bootstrap. Specifically, it is convenient to have
670   --  the same list of files to be compiled for all stages. So, if the
671   --  bootstrap compiler does not generate code for a given file, then
672   --  the stage1 compiler (and binder) also must deal with the case of
673   --  that file not being compiled. The predicate Generic_May_Lack_ALI is
674   --  True for those generic units for which missing ALI files are allowed.
675
676   procedure Write_Unit_Info
677     (Unit_Num : Unit_Number_Type;
678      Item     : Node_Id;
679      Prefix   : String := "";
680      Withs    : Boolean := False);
681   --  Print out debugging information about the unit. Prefix precedes the rest
682   --  of the printout. If Withs is True, we print out units with'ed by this
683   --  unit (not counting limited withs).
684
685private
686   pragma Inline (Cunit);
687   pragma Inline (Cunit_Entity);
688   pragma Inline (Dependency_Num);
689   pragma Inline (Fatal_Error);
690   pragma Inline (Generate_Code);
691   pragma Inline (Has_Allocator);
692   pragma Inline (Has_RACW);
693   pragma Inline (Is_Compiler_Unit);
694   pragma Inline (Increment_Serial_Number);
695   pragma Inline (Loading);
696   pragma Inline (Main_CPU);
697   pragma Inline (Main_Priority);
698   pragma Inline (Munit_Index);
699   pragma Inline (OA_Setting);
700   pragma Inline (Set_Cunit);
701   pragma Inline (Set_Cunit_Entity);
702   pragma Inline (Set_Fatal_Error);
703   pragma Inline (Set_Generate_Code);
704   pragma Inline (Set_Has_Allocator);
705   pragma Inline (Set_Has_RACW);
706   pragma Inline (Set_Loading);
707   pragma Inline (Set_Main_CPU);
708   pragma Inline (Set_Main_Priority);
709   pragma Inline (Set_OA_Setting);
710   pragma Inline (Set_Unit_Name);
711   pragma Inline (Source_Index);
712   pragma Inline (Unit_File_Name);
713   pragma Inline (Unit_Name);
714
715   type Unit_Record is record
716      Unit_File_Name   : File_Name_Type;
717      Unit_Name        : Unit_Name_Type;
718      Munit_Index      : Nat;
719      Expected_Unit    : Unit_Name_Type;
720      Source_Index     : Source_File_Index;
721      Cunit            : Node_Id;
722      Cunit_Entity     : Entity_Id;
723      Dependency_Num   : Int;
724      Ident_String     : Node_Id;
725      Main_Priority    : Int;
726      Main_CPU         : Int;
727      Serial_Number    : Nat;
728      Version          : Word;
729      Error_Location   : Source_Ptr;
730      Fatal_Error      : Boolean;
731      Generate_Code    : Boolean;
732      Has_RACW         : Boolean;
733      Is_Compiler_Unit : Boolean;
734      Dynamic_Elab     : Boolean;
735      Loading          : Boolean;
736      Has_Allocator    : Boolean;
737      OA_Setting       : Character;
738   end record;
739
740   --  The following representation clause ensures that the above record
741   --  has no holes. We do this so that when instances of this record are
742   --  written by Tree_Gen, we do not write uninitialized values to the file.
743
744   for Unit_Record use record
745      Unit_File_Name   at  0 range 0 .. 31;
746      Unit_Name        at  4 range 0 .. 31;
747      Munit_Index      at  8 range 0 .. 31;
748      Expected_Unit    at 12 range 0 .. 31;
749      Source_Index     at 16 range 0 .. 31;
750      Cunit            at 20 range 0 .. 31;
751      Cunit_Entity     at 24 range 0 .. 31;
752      Dependency_Num   at 28 range 0 .. 31;
753      Ident_String     at 32 range 0 .. 31;
754      Main_Priority    at 36 range 0 .. 31;
755      Main_CPU         at 40 range 0 .. 31;
756      Serial_Number    at 44 range 0 .. 31;
757      Version          at 48 range 0 .. 31;
758      Error_Location   at 52 range 0 .. 31;
759      Fatal_Error      at 56 range 0 ..  7;
760      Generate_Code    at 57 range 0 ..  7;
761      Has_RACW         at 58 range 0 ..  7;
762      Dynamic_Elab     at 59 range 0 ..  7;
763      Is_Compiler_Unit at 60 range 0 ..  7;
764      OA_Setting       at 61 range 0 ..  7;
765      Loading          at 62 range 0 ..  7;
766      Has_Allocator    at 63 range 0 ..  7;
767   end record;
768
769   for Unit_Record'Size use 64 * 8;
770   --  This ensures that we did not leave out any fields
771
772   package Units is new Table.Table (
773     Table_Component_Type => Unit_Record,
774     Table_Index_Type     => Unit_Number_Type,
775     Table_Low_Bound      => Main_Unit,
776     Table_Initial        => Alloc.Units_Initial,
777     Table_Increment      => Alloc.Units_Increment,
778     Table_Name           => "Units");
779
780   --  The following table stores strings from pragma Linker_Option lines
781
782   type Linker_Option_Entry is record
783      Option : String_Id;
784      --  The string for the linker option line
785
786      Unit : Unit_Number_Type;
787      --  The unit from which the linker option comes
788   end record;
789
790   package Linker_Option_Lines is new Table.Table (
791     Table_Component_Type => Linker_Option_Entry,
792     Table_Index_Type     => Integer,
793     Table_Low_Bound      => 1,
794     Table_Initial        => Alloc.Linker_Option_Lines_Initial,
795     Table_Increment      => Alloc.Linker_Option_Lines_Increment,
796     Table_Name           => "Linker_Option_Lines");
797
798   --  The following table stores references to pragmas that generate Notes
799
800   type Notes_Entry is record
801      Pragma_Node : Node_Id;
802      Unit        : Unit_Number_Type;
803   end record;
804
805   package Notes is new Table.Table (
806     Table_Component_Type => Notes_Entry,
807     Table_Index_Type     => Integer,
808     Table_Low_Bound      => 1,
809     Table_Initial        => Alloc.Notes_Initial,
810     Table_Increment      => Alloc.Notes_Increment,
811     Table_Name           => "Notes");
812
813   --  The following table records the compilation switches used to compile
814   --  the main unit. The table includes only switches. It excludes -o
815   --  switches as well as artifacts of the gcc/gnat1 interface such as
816   --  -quiet, -dumpbase, or -auxbase.
817
818   --  This table is set as part of the compiler argument scanning in
819   --  Back_End. It can also be reset in -gnatc mode from the data in an
820   --  existing ali file, and is read and written by the Tree_Read and
821   --  Tree_Write routines for ASIS.
822
823   package Compilation_Switches is new Table.Table (
824     Table_Component_Type => String_Ptr,
825     Table_Index_Type     => Nat,
826     Table_Low_Bound      => 1,
827     Table_Initial        => 30,
828     Table_Increment      => 100,
829     Table_Name           => "Compilation_Switches");
830
831   Load_Msg_Sloc : Source_Ptr;
832   --  Location for placing error messages (a token in the main source text)
833   --  This is set from Sloc (Enode) by Load only in the case where this Sloc
834   --  is in the main source file. This ensures that not found messages and
835   --  circular dependency messages reference the original with in this source.
836
837   type Load_Stack_Entry is record
838      Unit_Number : Unit_Number_Type;
839      With_Node   : Node_Id;
840   end record;
841
842   --  The Load_Stack table contains a list of unit numbers (indexes into the
843   --  unit table) of units being loaded on a single dependency chain, and a
844   --  flag to indicate whether this unit is loaded through a limited_with
845   --  clause. The First entry is the main unit. The second entry, if present
846   --  is a unit on which the first unit depends, etc. This stack is used to
847   --  generate error messages showing the dependency chain if a file is not
848   --  found, or whether a true circular dependency exists.  The Load_Unit
849   --  function makes an entry in this table when it is called, and removes
850   --  the entry just before it returns.
851
852   package Load_Stack is new Table.Table (
853     Table_Component_Type => Load_Stack_Entry,
854     Table_Index_Type     => Int,
855     Table_Low_Bound      => 0,
856     Table_Initial        => Alloc.Load_Stack_Initial,
857     Table_Increment      => Alloc.Load_Stack_Increment,
858     Table_Name           => "Load_Stack");
859
860   procedure Sort (Tbl : in out Unit_Ref_Table);
861   --  This procedure sorts the given unit reference table in order of
862   --  ascending unit names, where the ordering relation is as described
863   --  by the comparison routines provided by package Uname.
864
865   --  The Version_Ref table records Body_Version and Version attribute
866   --  references. The entries are simply the strings for the external
867   --  names that correspond to the referenced values.
868
869   package Version_Ref is new Table.Table (
870     Table_Component_Type => String_Id,
871     Table_Index_Type     => Nat,
872     Table_Low_Bound      => 1,
873     Table_Initial        => 20,
874     Table_Increment      => 100,
875     Table_Name           => "Version_Ref");
876
877end Lib;
878