1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                             L I B . X R E F                              --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1998-2012, 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.  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.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26--  This package contains for collecting and outputting cross-reference
27--  information.
28
29with Einfo;    use Einfo;
30with Lib.Util; use Lib.Util;
31with Put_Alfa;
32
33package Lib.Xref is
34
35   -------------------------------------------------------
36   -- Format of Cross-Reference Information in ALI File --
37   -------------------------------------------------------
38
39   --  Cross-reference sections follow the dependency section (D lines) in
40   --  an ALI file, so that they need not be read by gnatbind, gnatmake etc.
41
42   --  A cross reference section has a header of the form
43
44   --     X  dependency-number  filename
45
46   --        This header precedes xref information (entities/references from
47   --        the unit), identified by dependency number and file name. The
48   --        dependency number is the index into the generated D lines and
49   --        is ones origin (e.g. 2 = reference to second generated D line).
50
51   --        Note that the filename here will reflect the original name if
52   --        a Source_Reference pragma was encountered (since all line number
53   --        references will be with respect to the original file).
54
55   --  The lines following the header look like
56
57   --  line type col level entity renameref instref typeref overref ref ref
58
59   --        line is the line number of the referenced entity. The name of
60   --        the entity starts in column col. Columns are numbered from one,
61   --        and if horizontal tab characters are present, the column number
62   --        is computed assuming standard 1,9,17,.. tab stops. For example,
63   --        if the entity is the first token on the line, and is preceded
64   --        by space-HT-space, then the column would be column 10.
65
66   --        type is a single letter identifying the type of the entity. See
67   --        next section (Cross-Reference Entity Identifiers) for a full list
68   --        of the characters used).
69
70   --        col is the column number of the referenced entity
71
72   --        level is a single character that separates the col and entity
73   --        fields. It is an asterisk (*) for a top level library entity that
74   --        is publicly visible, as well for an entity declared in the visible
75   --        part of a generic package, the plus sign (+) for a C/C++ static
76   --        entity, and space otherwise.
77
78   --        entity is the name of the referenced entity, with casing in
79   --        the canonical casing for the source file where it is defined.
80
81   --        renameref provides information on renaming. If the entity is
82   --        a package, object or overloadable entity which is declared by
83   --        a renaming declaration, and the renaming refers to an entity
84   --        with a simple identifier or expanded name, then renameref has
85   --        the form:
86
87   --            =line:col
88
89   --        Here line:col give the reference to the identifier that appears
90   --        in the renaming declaration. Note that we never need a file entry,
91   --        since this identifier is always in the current file in which the
92   --        entity is declared. Currently, renameref appears only for the
93   --        simple renaming case. If the renaming reference is a complex
94   --        expressions, then renameref is omitted. Here line/col give
95   --        line/column as defined above.
96
97   --        instref is only present for package and subprogram instances. The
98   --        information in instref is the location of the point of declaration
99   --        of the generic parent unit. This part has the form:
100
101   --            [file|line]
102
103   --        without column information, on the reasonable assumption that
104   --        there is only one unit per line (the same assumption is made in
105   --        references to entities declared within instances, see below).
106
107   --        typeref is the reference for a related type. This part is
108   --        optional. It is present for the following cases:
109
110   --          derived types (points to the parent type)   LR=<>
111   --          access types (points to designated type)    LR=()
112   --          array types (points to component type)      LR=()
113   --          subtypes (points to ancestor type)          LR={}
114   --          functions (points to result type)           LR={}
115   --          enumeration literals (points to enum type)  LR={}
116   --          objects and components (points to type)     LR={}
117
118   --          For a type that implements multiple interfaces, there is an
119   --          entry of the form  LR=<> for each of the interfaces appearing
120   --          in the type declaration. In the data structures of ali.ads,
121   --          the type that the entity extends (or the first interface if
122   --          there is no such type) is stored in Xref_Entity_Record.Tref*,
123   --          additional interfaces are stored in the list of references
124   --          with a special type of Interface_Reference.
125
126   --          For an array type, there is an entry of the form LR=<> for each
127   --          of the index types appearing in the type declaration. The index
128   --          types follow the entry for the component type. In the data
129   --          structures of ali.ads, however, the list of index types are
130   --          output in the list of references with a special Rtype set to
131   --          Array_Index_Reference.
132
133   --          In the above list LR shows the brackets used in the output which
134   --          has one of the two following forms:
135
136   --            L file | line type col R      user entity
137   --            L name-in-lower-case R        standard entity
138
139   --          For the form for a user entity, file is the dependency number
140   --          of the file containing the declaration of the related type.
141   --          This number and the following vertical bar are omitted if the
142   --          relevant type is defined in the same file as the current entity.
143   --          The line, type, col are defined as previously described, and
144   --          specify the location of the relevant type declaration in the
145   --          referenced file. For the standard entity form, the name between
146   --          the brackets is the normal name of the entity in lower case.
147
148   --        overref is present for overriding operations (procedures and
149   --        functions), and provides information on the operation that it
150   --        overrides. This information has the format:
151
152   --        '<' file | line 'o' col '>'
153
154   --           file is the dependency number of the file containing the
155   --           declaration of the overridden operation. It and the following
156   --           vertical bar are omitted if the file is the same as that of
157   --           the overriding operation.
158
159   --     There may be zero or more ref entries on each line
160
161   --        file | line type col [...]
162
163   --           file is the dependency number of the file with the reference.
164   --           It and the following vertical bar are omitted if the file is
165   --           the same as the previous ref, and the refs for the current
166   --           file are first (and do not need a bar).
167
168   --           line is the line number of the reference
169
170   --           col is the column number of the reference, as defined above
171
172   --           type is one of
173   --              b = body entity
174   --              c = completion of private or incomplete type
175   --              d = discriminant of type
176   --              D = object definition
177   --              e = end of spec
178   --              H = abstract type
179   --              i = implicit reference
180   --              k = implicit reference to parent unit in child unit
181   --              l = label on END line
182   --              m = modification
183   --              o = own variable reference (SPARK only)
184   --              p = primitive operation
185   --              P = overriding primitive operation
186   --              r = reference
187   --              R = subprogram reference in dispatching call
188   --              s = subprogram reference in a static call
189   --              t = end of body
190   --              w = WITH line
191   --              x = type extension
192   --              z = generic formal parameter
193   --              > = subprogram IN parameter
194   --              = = subprogram IN OUT parameter
195   --              < = subprogram OUT parameter
196   --              ^ = subprogram ACCESS parameter
197
198   --           b is used for spec entities that are repeated in a body,
199   --           including the unit (subprogram, package, task, protected body,
200   --           protected entry) name itself, and in the case of a subprogram,
201   --           the formals. This letter is also used for the occurrence of
202   --           entry names in accept statements. Such entities are not
203   --           considered to be definitions for cross-referencing purposes,
204   --           but rather are considered to be references to the corresponding
205   --           spec entities, marked with this special type.
206
207   --           c is similar to b but is used to mark the completion of a
208   --           private or incomplete type. As with b, the completion is not
209   --           regarded as a separate definition, but rather a reference to
210   --           the initial declaration, marked with this special type.
211
212   --           d is used to identify a discriminant of a type. If this is
213   --           an incomplete or private type with discriminants, the entry
214   --           denotes the occurrence of the discriminant in the partial view
215   --           which is also the point of definition of the discriminant. The
216   --           occurrence of the same discriminant in the full view is a
217   --           regular reference to it.
218
219   --           e is used to identify the end of a construct in the following
220   --           cases:
221
222   --             Block Statement        end [block_IDENTIFIER];
223   --             Loop Statement         end loop [loop_IDENTIFIER];
224   --             Package Specification  end [[PARENT_UNIT_NAME .] IDENTIFIER];
225   --             Task Definition        end [task_IDENTIFIER];
226   --             Protected Definition   end [protected_IDENTIFIER];
227   --             Record Definition      end record;
228   --             Enumeration Definition );
229
230   --           Note that 'e' entries are special in that they appear even
231   --           in referencing units (normally xref entries appear only for
232   --           references in the extended main source unit (see Lib) to which
233   --           the ali applies. But 'e' entries are really structural and
234   --           simply indicate where packages end. This information can be
235   --           used to reconstruct scope information for any entities
236   --           referenced from within the package. The line/column values
237   --           for these entries point to the semicolon ending the construct.
238
239   --           i is used to identify a reference to the entity in a generic
240   --           actual or in a default in a call. The node that denotes the
241   --           entity does not come from source, but it has the Sloc of the
242   --           source node that generates the implicit reference, and it is
243   --           useful to record this one.
244
245   --           k is another non-standard reference type, used to record a
246   --           reference from a child unit to its parent. For various cross-
247   --           referencing tools, we need a pointer from the xref entries for
248   --           the child to the parent. This is the opposite way round from
249   --           normal xref entries, since the reference is *from* the child
250   --           unit *to* the parent unit, yet appears in the xref entries for
251   --           the child. Consider this example:
252   --
253   --             package q is
254   --             end;
255   --             package q.r is
256   --             end q.r;
257   --
258   --           The ali file for q-r.ads has these entries
259   --
260   --             D q.ads
261   --             D q-r.ads
262   --             D system.ads
263   --             X 1 q.ads
264   --             1K9*q 2e4 2|1r9 2r5
265   --             X 2 q-r.ads
266   --             1K11*r 1|1k9 2|2l7 2e8
267   --
268   --           Here the 2|1r9 entry appearing in the section for the parent
269   --           is the normal reference from the child to the parent. The 1k9
270   --           entry in the section for the child duplicates this information
271   --           but appears in the child rather than the parent.
272
273   --           l is used to identify the occurrence in the source of the name
274   --           on an end line. This is just a syntactic reference which can be
275   --           ignored for semantic purposes (e.g. a call graph construction).
276   --           Again, in the case of an accept there can be multiple l lines.
277
278   --           o is used for variables referenced from a SPARK 'own'
279   --           definition. In the SPARK language, it is allowed to use a
280   --           variable before its actual declaration.
281
282   --           p is used to mark a primitive operation of the given entity.
283   --           For example, if we have a type Tx, and a primitive operation
284   --           Pq of this type, then an entry in the list of references to
285   --           Tx will point to the declaration of Pq. Note that this entry
286   --           type is unusual because it an implicit rather than explicit,
287   --           and the name of the reference does not match the name of the
288   --           entity for which a reference is generated. These entries are
289   --           generated only for entities declared in the extended main
290   --           source unit (main unit itself, its separate spec (if any).
291   --           and all subunits (considered recursively).
292
293   --           If the primitive operation overrides an inherited primitive
294   --           operation of the parent type, the letter 'P' is used in the
295   --           corresponding entry.
296
297   --           R is used to mark a dispatching call. The reference is to
298   --           the specification of the primitive operation of the root
299   --           type when the call has a controlling argument in its class.
300
301   --           s is used to mark a static subprogram call. The reference is
302   --           to the specification of the subprogram being called.
303
304   --           t is similar to e. It identifies the end of a corresponding
305   --           body (such a reference always links up with a b reference)
306
307   --             Subprogram Body        end [DESIGNATOR];
308   --             Package Body           end [[PARENT_UNIT_NAME .] IDENTIFIER];
309   --             Task Body              end [task_IDENTIFIER];
310   --             Entry Body             end [entry_IDENTIFIER];
311   --             Protected Body         end [protected_IDENTIFIER]
312   --             Accept Statement       end [entry_IDENTIFIER]];
313
314   --           Note that in the case of accept statements, there can
315   --           be multiple b and t entries for the same entity.
316
317   --           x is used to identify the reference as the entity from which a
318   --           tagged type is extended. This allows immediate access to the
319   --           parent of a tagged type.
320
321   --           z is used on the cross-reference line for a generic unit,
322   --           to mark the definition of a generic formal of the unit. This
323   --           entry type is similar to 'k' and 'p' in that it is an implicit
324   --           reference for an entity with a different name.
325
326   --           The characters >, <. =, and ^ are used on the cross-reference
327   --           line for a subprogram, to denote formal parameters and their
328   --           modes. As with the 'z' and 'p' entries, each such entry is
329   --           an implicit reference to an entity with a different name.
330
331   --           [..] is used for generic instantiation references. These
332   --           references are present only if the entity in question is
333   --           a generic entity, and in that case the [..] contains the
334   --           reference for the instantiation. In the case of nested
335   --           instantiations, this can be nested [...[...[...]]] etc. The
336   --           reference is of the form [file|line] no column is present since
337   --           it is assumed that only one instantiation appears on a single
338   --           source line. Note that the appearance of file numbers in such
339   --           references follows the normal rules (present only if needed,
340   --           and resets the current file for subsequent references).
341
342   --     Examples:
343
344   --        44B5*Flag_Type{boolean} 5r23 6m45 3|9r35 11r56
345
346   --           This line gives references for the publicly visible Boolean
347   --           type Flag_Type declared on line 44, column 5. There are four
348   --           references
349
350   --              a reference on line 5, column 23 of the current file
351
352   --              a modification on line 6, column 45 of the current file
353
354   --              a reference on line 9, column 35 of unit number 3
355
356   --              a reference on line 11, column 56 of unit number 3
357
358   --        2U13 p3=2:35 5b13 8r4 12r13 12t15
359
360   --           This line gives references for the non-publicly visible
361   --           procedure p3 declared on line 2, column 13. This procedure
362   --           renames the procedure whose identifier reference is at
363   --           line 2 column 35. There are four references:
364
365   --              the corresponding body entity at line 5, column 13,
366   --              of the current file.
367
368   --              a reference (e.g. a call) at line 8 column 4 of the
369   --              current file.
370
371   --              the END line of the body has an explicit reference to
372   --              the name of the procedure at line 12, column 13.
373
374   --              the body ends at line 12, column 15, just past this label
375
376   --        16I9*My_Type<2|4I9> 18r8
377
378   --           This line gives references for the publicly visible Integer
379   --           derived type My_Type declared on line 16, column 9. It also
380   --           gives references to the parent type declared in the unit
381   --           number 2 on line 4, column 9. There is one reference:
382
383   --              a reference (e.g. a variable declaration) at line 18 column
384   --              4 of the current file.
385
386   --        10I3*Genv{integer} 3|4I10[6|12]
387
388   --           This line gives a reference for the entity Genv in a generic
389   --           package. The reference in file 3, line 4, col 10, refers to an
390   --           instance of the generic where the instantiation can be found in
391   --           file 6 at line 12.
392
393   --  Continuation lines are used if the reference list gets too long,
394   --  a continuation line starts with a period, and then has references
395   --  continuing from the previous line. The references are sorted first
396   --  by unit, then by position in the source.
397
398   --  Note on handling of generic entities. The cross-reference is oriented
399   --  towards source references, so the entities in a generic instantiation
400   --  are not considered distinct from the entities in the template. All
401   --  definitions and references from generic instantiations are suppressed,
402   --  since they will be generated from the template. Any references to
403   --  entities in a generic instantiation from outside the instantiation
404   --  are considered to be references to the original template entity.
405
406   ----------------------------------------
407   -- Cross-Reference Entity Identifiers --
408   ----------------------------------------
409
410   --  In the cross-reference section of the ali file, entity types are
411   --  identified by a single letter, indicating the entity type. The following
412   --  table indicates the letter. A space for an entry is used for entities
413   --  that do not appear in the cross-reference table.
414
415   --  For objects, the character * appears in this table. In the xref listing,
416   --  this character is replaced by the lower case letter that corresponds to
417   --  the type of the object. For example, if a variable is of a Float type,
418   --  then, since the type is represented by an upper case F, the object would
419   --  be represented by a lower case f.
420
421   --  A special exception is the case of booleans, whose entities are normal
422   --  E_Enumeration_Type or E_Enumeration_Subtype entities, but which appear
423   --  as B/b in the xref lines, rather than E/e.
424
425   --  For private types, the character + appears in the table. In this case
426   --  the kind of the underlying type is used, if available, to determine the
427   --  character to use in the xref listing. The listing will still include a
428   --  '+' for a generic private type, for example, but will retain the '*' for
429   --  an object or formal parameter of such a type.
430
431   --  For subprograms, the characters 'U' and 'V' appear in the table,
432   --  indicating procedures and functions. If the operation is abstract,
433   --  these letters are replaced in the xref by 'x' and 'y' respectively.
434
435   Xref_Entity_Letters : array (Entity_Kind) of Character :=
436     (E_Void                                       => ' ',
437      E_Variable                                   => '*',
438      E_Component                                  => '*',
439      E_Constant                                   => '*',
440      E_Discriminant                               => '*',
441
442      E_Loop_Parameter                             => '*',
443      E_In_Parameter                               => '*',
444      E_Out_Parameter                              => '*',
445      E_In_Out_Parameter                           => '*',
446      E_Generic_In_Out_Parameter                   => '*',
447
448      E_Generic_In_Parameter                       => '*',
449      E_Named_Integer                              => 'N',
450      E_Named_Real                                 => 'N',
451      E_Enumeration_Type                           => 'E',  -- B for boolean
452      E_Enumeration_Subtype                        => 'E',  -- B for boolean
453
454      E_Signed_Integer_Type                        => 'I',
455      E_Signed_Integer_Subtype                     => 'I',
456      E_Modular_Integer_Type                       => 'M',
457      E_Modular_Integer_Subtype                    => 'M',
458      E_Ordinary_Fixed_Point_Type                  => 'O',
459
460      E_Ordinary_Fixed_Point_Subtype               => 'O',
461      E_Decimal_Fixed_Point_Type                   => 'D',
462      E_Decimal_Fixed_Point_Subtype                => 'D',
463      E_Floating_Point_Type                        => 'F',
464      E_Floating_Point_Subtype                     => 'F',
465
466      E_Access_Type                                => 'P',
467      E_Access_Subtype                             => 'P',
468      E_Access_Attribute_Type                      => 'P',
469      E_Allocator_Type                             => ' ',
470      E_General_Access_Type                        => 'P',
471
472      E_Access_Subprogram_Type                     => 'P',
473      E_Access_Protected_Subprogram_Type           => 'P',
474      E_Anonymous_Access_Subprogram_Type           => ' ',
475      E_Anonymous_Access_Protected_Subprogram_Type => ' ',
476      E_Anonymous_Access_Type                      => ' ',
477
478      E_Array_Type                                 => 'A',
479      E_Array_Subtype                              => 'A',
480      E_String_Type                                => 'S',
481      E_String_Subtype                             => 'S',
482      E_String_Literal_Subtype                     => ' ',
483
484      E_Class_Wide_Type                            => 'C',
485      E_Class_Wide_Subtype                         => 'C',
486      E_Record_Type                                => 'R',
487      E_Record_Subtype                             => 'R',
488      E_Record_Type_With_Private                   => 'R',
489
490      E_Record_Subtype_With_Private                => 'R',
491      E_Private_Type                               => '+',
492      E_Private_Subtype                            => '+',
493      E_Limited_Private_Type                       => '+',
494      E_Limited_Private_Subtype                    => '+',
495
496      E_Incomplete_Type                            => '+',
497      E_Incomplete_Subtype                         => '+',
498      E_Task_Type                                  => 'T',
499      E_Task_Subtype                               => 'T',
500      E_Protected_Type                             => 'W',
501
502      E_Protected_Subtype                          => 'W',
503      E_Exception_Type                             => ' ',
504      E_Subprogram_Type                            => ' ',
505      E_Enumeration_Literal                        => 'n',
506      E_Function                                   => 'V',
507
508      E_Operator                                   => 'V',
509      E_Procedure                                  => 'U',
510      E_Entry                                      => 'Y',
511      E_Entry_Family                               => 'Y',
512      E_Block                                      => 'q',
513
514      E_Entry_Index_Parameter                      => '*',
515      E_Exception                                  => 'X',
516      E_Generic_Function                           => 'v',
517      E_Generic_Package                            => 'k',
518      E_Generic_Procedure                          => 'u',
519
520      E_Label                                      => 'L',
521      E_Loop                                       => 'l',
522      E_Return_Statement                           => ' ',
523      E_Package                                    => 'K',
524
525      --  The following entities are not ones to which we gather the cross-
526      --  references, since it does not make sense to do so (e.g. references to
527      --  a package are to the spec, not the body) Indeed the occurrence of the
528      --  body entity is considered to be a reference to the spec entity.
529
530      E_Package_Body                               => ' ',
531      E_Protected_Object                           => ' ',
532      E_Protected_Body                             => ' ',
533      E_Task_Body                                  => ' ',
534      E_Subprogram_Body                            => ' ',
535
536      --  ??? The following letter is added for completion, proper design and
537      --  implementation of abstract state cross-referencing to follow.
538
539      E_Abstract_State                             => ' ');
540
541   --  The following table is for information purposes. It shows the use of
542   --  each character appearing as an entity type.
543
544   --  letter  lower case usage                UPPER CASE USAGE
545
546   --    a     array object (except string)    array type (except string)
547   --    b     Boolean object                  Boolean type
548   --    c     class-wide object               class-wide type
549   --    d     decimal fixed-point object      decimal fixed-point type
550   --    e     non-Boolean enumeration object  non_Boolean enumeration type
551   --    f     floating-point object           floating-point type
552   --    g     C/C++ macro                     C/C++ fun-like macro
553   --    h     Interface (Ada 2005)            Abstract type
554   --    i     signed integer object           signed integer type
555   --    j     C++ class object                C++ class
556   --    k     generic package                 package
557   --    l     label on loop                   label on statement
558   --    m     modular integer object          modular integer type
559   --    n     enumeration literal             named number
560   --    o     ordinary fixed-point object     ordinary fixed-point type
561   --    p     access object                   access type
562   --    q     label on block                  C/C++ include file
563   --    r     record object                   record type
564   --    s     string object                   string type
565   --    t     task object                     task type
566   --    u     generic procedure               procedure
567   --    v     generic function or operator    function or operator
568   --    w     protected object                protected type
569   --    x     abstract procedure              exception
570   --    y     abstract function               entry or entry family
571   --    z     generic formal parameter        (unused)
572
573   ---------------------------------------------------
574   -- Handling of Imported and Exported Subprograms --
575   ---------------------------------------------------
576
577   --  If a pragma Import or Interface applies to a subprogram, the pragma is
578   --  the completion of the subprogram. This is noted in the ALI file by
579   --  making the occurrence of the subprogram in the pragma into a body
580   --  reference ('b') and by including the external name of the subprogram and
581   --  its language, bracketed by '<' and '>' in that reference. For example:
582
583   --     3U13*imported_proc 4b<c,there>21
584
585   --  indicates that procedure imported_proc, declared at line 3, has a pragma
586   --  Import at line 4, that its body is in C, and that the link name as given
587   --  in the pragma is "there".
588
589   --  If a pragma Export applies to a subprogram exported to a foreign
590   --  language (ie. the pragma has convention different from Ada), then the
591   --  pragma is annotated in the ALI file by making the occurrence of the
592   --  subprogram in the pragma into an implicit reference ('i') and by
593   --  including the external name of the subprogram and its language,
594   --  bracketed by '<' and '>' in that reference. For example:
595
596   --     3U13*exported_proc 4i<c,here>21
597
598   --  indicates that procedure exported_proc, declared at line 3, has a pragma
599   --  Export at line 4, that its body is exported to C, and that the link name
600   --  as given in the pragma is "here".
601
602   ----------------------
603   -- Alfa Information --
604   ----------------------
605
606   --  This package defines procedures for collecting Alfa information and
607   --  printing in ALI files.
608
609   package Alfa is
610
611      function Enclosing_Subprogram_Or_Package (N : Node_Id) return Entity_Id;
612      --  Return the closest enclosing subprogram of package
613
614      procedure Generate_Dereference
615        (N   : Node_Id;
616         Typ : Character := 'r');
617      --  This procedure is called to record a dereference. N is the location
618      --  of the dereference.
619
620      type Node_Processing is access procedure (N : Node_Id);
621
622      procedure Traverse_Compilation_Unit
623        (CU           : Node_Id;
624         Process      : Node_Processing;
625         Inside_Stubs : Boolean);
626      --  Call Process on all declarations in compilation unit CU. If
627      --  Inside_Stubs is True, then the body of stubs is also traversed.
628      --  Generic declarations are ignored.
629
630      procedure Traverse_All_Compilation_Units (Process : Node_Processing);
631      --  Call Process on all declarations through all compilation units.
632      --  Generic declarations are ignored.
633
634      procedure Collect_Alfa (Sdep_Table : Unit_Ref_Table; Num_Sdep : Nat);
635      --  Collect Alfa information from library units (for files and scopes)
636      --  and from cross-references. Fill in the tables in library package
637      --  called Alfa.
638
639      procedure Output_Alfa is new Put_Alfa;
640      --  Output Alfa information to the ALI files, based on the information
641      --  collected in the tables in library package called Alfa, and using
642      --  routines in Lib.Util.
643
644   end Alfa;
645
646   -----------------
647   -- Subprograms --
648   -----------------
649
650   procedure Generate_Definition (E : Entity_Id);
651   --  Records the definition of an entity
652
653   procedure Generate_Operator_Reference
654     (N : Node_Id;
655      T : Entity_Id);
656   --  Node N is an operator node, whose entity has been set. If this entity
657   --  is a user defined operator (i.e. an operator not defined in package
658   --  Standard), then a reference to the operator is recorded at node N.
659   --  T is the operand type of the operator. A reference to the operator is an
660   --  implicit reference to the type, and that needs to be recorded to avoid
661   --  spurious warnings on unused entities, when the operator is a renaming of
662   --  a predefined operator.
663
664   procedure Generate_Reference
665     (E       : Entity_Id;
666      N       : Node_Id;
667      Typ     : Character := 'r';
668      Set_Ref : Boolean   := True;
669      Force   : Boolean   := False);
670   --  This procedure is called to record a reference. N is the location of the
671   --  reference and E is the referenced entity. Typ is one of:
672   --
673   --    a character already described in the description of ref entries above
674   --    ' ' for dummy reference (see below)
675   --
676   --  Note: all references to incomplete or private types are to the original
677   --  (incomplete or private type) declaration. The full declaration is
678   --  treated as a reference with type 'c'.
679   --
680   --  Note: all references to packages or subprograms are to the entity for
681   --  the spec. The entity in the body is treated as a reference with type
682   --  'b'. Similar handling for references to subprogram formals.
683   --
684   --  The call has no effect if N is not in the extended main source unit
685   --  This check is omitted for type 'e' references (where it is useful to
686   --  have structural scoping information for other than the main source),
687   --  and for 'p' (since we want to pick up inherited primitive operations
688   --  that are defined in other packages).
689   --
690   --  The call also has no effect if any of the following conditions hold:
691   --
692   --    cross-reference collection is disabled
693   --    entity does not come from source (and Force is False)
694   --    reference does not come from source (and Force is False)
695   --    the entity is not one for which xrefs are appropriate
696   --    the type letter is blank
697   --    the node N is not an identifier, defining identifier, or expanded name
698   --    the type is 'p' and the entity is not in the extended main source
699   --
700   --  If all these conditions are met, then the Is_Referenced flag of E is set
701   --  (unless Set_Ref is False) and a cross-reference entry is recorded for
702   --  later output when Output_References is called.
703   --
704   --  Note: the dummy space entry is for the convenience of some callers,
705   --  who find it easier to pass a space to suppress the entry than to do
706   --  a specific test. The call has no effect if the type is a space.
707   --
708   --  The parameter Set_Ref is normally True, and indicates that in addition
709   --  to generating a cross-reference, the Referenced flag of the specified
710   --  entity should be set. If this parameter is False, then setting of the
711   --  Referenced flag is inhibited.
712   --
713   --  The parameter Force is set to True to force a reference to be generated
714   --  even if Comes_From_Source is false. This is used for certain implicit
715   --  references, and also for end label references.
716
717   procedure Generate_Reference_To_Formals (E : Entity_Id);
718   --  Add a reference to the definition of each formal on the line for
719   --  a subprogram.
720
721   procedure Generate_Reference_To_Generic_Formals (E : Entity_Id);
722   --  Add a reference to the definition of each generic formal on the line
723   --  for a generic unit.
724
725   procedure Output_References;
726   --  Output references to the current ali file
727
728   procedure Initialize;
729   --  Initialize internal tables
730
731end Lib.Xref;
732