1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This package contains the input routines used for reading the
35 -- input source file. The actual I/O routines are in OS_Interface,
36 -- with this module containing only the system independent processing.
38 -- General Note: throughout the compiler, we use the term line or source
39 -- line to refer to a physical line in the source, terminated by the end of
40 -- physical line sequence. See Skip_Line_Terminators procedure for a full
41 -- description of the difference between logical and physical lines.
44 with Casing; use Casing;
46 with Types; use Types;
50 ----------------------------
51 -- Source License Control --
52 ----------------------------
54 -- The following type indicates the license state of a source if it
59 -- Licensing status of this source unit is unknown
62 -- This is a non-GPL'ed unit that is restricted from depending
63 -- on GPL'ed units (e.g. proprietary code is in this category)
66 -- This file is licensed under the unmodified GPL. It is not allowed
67 -- to depend on Non_GPL units, and Non_GPL units may not depend on
71 -- This file is licensed under the GNAT modified GPL (see header of
72 -- This file for wording of the modification). It may depend on other
73 -- Modified_GPL units or on unrestricted units.
76 -- The license on this file is permitted to depend on any other
77 -- units, or have other units depend on it, without violating the
78 -- license of this unit. Examples are public domain units, and
79 -- units defined in the RM).
81 -- The above license status is checked when the appropriate check is
82 -- activated and one source depends on another, and the licensing state
83 -- of both files is known:
85 -- The prohibited combinations are:
87 -- Restricted file may not depend on GPL file
89 -- GPL file may not depend on Restricted file
91 -- Modified GPL file may not depend on Restricted file
92 -- Modified_GPL file may not depend on GPL file
94 -- The reason for the last restriction here is that a client depending
95 -- on a modified GPL file must be sure that the license condition is
96 -- correct considered transitively.
98 -- The licensing status is determined either by the presence of a
99 -- specific pragma License, or by scanning the header for a predefined
100 -- file, or any file if compiling in -gnatg mode.
102 -----------------------
103 -- Source File Table --
104 -----------------------
106 -- The source file table has an entry for each source file read in for
107 -- this run of the compiler. This table is (default) initialized when
108 -- the compiler is loaded, and simply accumulates entries as compilation
109 -- proceeds and the Sinput.L.Load_Source_File procedure is called to load
110 -- required source files.
112 -- Virtual entries are also created for generic templates when they are
113 -- instantiated, as described in a separate section later on.
115 -- In the case where there are multiple main units (e.g. in the case of
116 -- the cross-reference tool), this table is not reset between these units,
117 -- so that a given source file is only read once if it is used by two
118 -- separate main units.
120 -- The entries in the table are accessed using a Source_File_Index that
121 -- ranges from 1 to Last_Source_File. Each entry has the following fields
123 -- Note that entry 1 is always for system.ads (see Targparm for details
124 -- of why we always read this source file first), and we have defined a
125 -- constant Types.System_Source_File_Index as 1 to reflect this fact.
127 -- File_Name : File_Name_Type
128 -- Name of the source file (simple name with no directory information).
129 -- Set by Sinput.L.Load_Source_File and cannot be subequently changed.
131 -- Full_File_Name : File_Name_Type
132 -- Full file name (full name with directory info), used for generation
133 -- of error messages, etc. Set by Sinput.L.Load_Source_File and cannot
134 -- be subsequently changed.
136 -- Reference_Name : File_Name_Type
137 -- Name to be used for source file references in error messages where
138 -- only the simple name of the file is required. Identical to File_Name
139 -- unless pragma Source_Reference is used to change it. Only processing
140 -- for the Source_Reference pragma circuit may set this field.
142 -- Full_Ref_Name : File_Name_Type
143 -- Name to be used for source file references in error messages where
144 -- the full name of the file is required. Identical to Full_File_Name
145 -- unless pragma Source_Reference is used to change it. Only processing
146 -- for the Source_Reference pragma may set this field.
148 -- Debug_Source_Name : File_Name_Type
149 -- Name to be used for source file references in debugging information
150 -- where only the simple name of the file is required. Identical to
151 -- Full_Ref_Name unless the -gnatD (debug source file) switch is used.
152 -- Only processing in Sprint that generates this file is permitted to
155 -- License : License_Type;
156 -- License status of source file
158 -- Num_SRef_Pragmas : Nat;
159 -- Number of source reference pragmas present in source file
161 -- First_Mapped_Line : Logical_Line_Number;
162 -- This field stores logical line number of the first line in the
163 -- file that is not a Source_Reference pragma. If no source reference
164 -- pragmas are used, then the value is set to No_Line_Number.
166 -- Source_Text : Source_Buffer_Ptr
167 -- Text of source file. Note that every source file has a distinct set
168 -- of non-overlapping logical bounds, so it is possible to determine
169 -- which file is referenced from a given subscript (Source_Ptr) value.
170 -- Set by Sinput.L.Load_Source_File and cannot be subsequently changed.
172 -- Source_First : Source_Ptr;
173 -- Subscript of first character in Source_Text. Note that this cannot
174 -- be obtained as Source_Text'First, because we use virtual origin
175 -- addressing. Set by Sinput.L procedures when the entry is first
176 -- created and never subsequently changed.
178 -- Source_Last : Source_Ptr;
179 -- Subscript of last character in Source_Text. Note that this cannot
180 -- be obtained as Source_Text'Last, because we use virtual origin
181 -- addressing, so this value is always Source_Ptr'Last. Set by
182 -- Sinput.L procedures when the entry is first created and never
183 -- subsequently changed.
185 -- Time_Stamp : Time_Stamp_Type;
186 -- Time stamp of the source file. Set by Sinput.L.Load_Source_File,
187 -- and cannot be subsequently changed.
189 -- Source_Checksum : Word;
190 -- Computed checksum for contents of source file. See separate section
191 -- later on in this spec for a description of the checksum algorithm.
193 -- Last_Source_Line : Physical_Line_Number;
194 -- Physical line number of last source line. Whlie a file is being
195 -- read, this refers to the last line scanned. Once a file has been
196 -- completely scanned, it is the number of the last line in the file,
197 -- and hence also gives the number of source lines in the file.
199 -- Keyword_Casing : Casing_Type;
200 -- Casing style used in file for keyword casing. This is initialized
201 -- to Unknown, and then set from the first occurrence of a keyword.
202 -- This value is used only for formatting of error messages.
204 -- Identifier_Casing : Casing_Type;
205 -- Casing style used in file for identifier casing. This is initialized
206 -- to Unknown, and then set from an identifier in the program as soon as
207 -- one is found whose casing is sufficiently clear to make a decision.
208 -- This value is used for formatting of error messages, and also is used
209 -- in the detection of keywords misused as identifiers.
211 -- Instantiation : Source_Ptr;
212 -- Source file location of the instantiation if this source file entry
213 -- represents a generic instantiation. Set to No_Location for the case
214 -- of a normal non-instantiation entry. See section below for details.
215 -- This field is read-only for clients.
217 -- Template : Source_File_Index;
218 -- Source file index of the source file containing the template if this
219 -- is a generic instantiation. Set to No_Source_File for the normal case
220 -- of a non-instantiation entry. See Sinput-L for details. This field is
221 -- read-only for clients.
223 -- The source file table is accessed by clients using the following
224 -- subprogram interface:
226 subtype SFI is Source_File_Index;
228 function Debug_Source_Name (S : SFI) return File_Name_Type;
229 function File_Name (S : SFI) return File_Name_Type;
230 function First_Mapped_Line (S : SFI) return Logical_Line_Number;
231 function Full_File_Name (S : SFI) return File_Name_Type;
232 function Full_Ref_Name (S : SFI) return File_Name_Type;
233 function Identifier_Casing (S : SFI) return Casing_Type;
234 function Instantiation (S : SFI) return Source_Ptr;
235 function Keyword_Casing (S : SFI) return Casing_Type;
236 function Last_Source_Line (S : SFI) return Physical_Line_Number;
237 function License (S : SFI) return License_Type;
238 function Num_SRef_Pragmas (S : SFI) return Nat;
239 function Reference_Name (S : SFI) return File_Name_Type;
240 function Source_Checksum (S : SFI) return Word;
241 function Source_First (S : SFI) return Source_Ptr;
242 function Source_Last (S : SFI) return Source_Ptr;
243 function Source_Text (S : SFI) return Source_Buffer_Ptr;
244 function Template (S : SFI) return Source_File_Index;
245 function Time_Stamp (S : SFI) return Time_Stamp_Type;
247 procedure Set_Keyword_Casing (S : SFI; C : Casing_Type);
248 procedure Set_Identifier_Casing (S : SFI; C : Casing_Type);
249 procedure Set_License (S : SFI; L : License_Type);
251 function Last_Source_File return Source_File_Index;
252 -- Index of last source file table entry
254 function Num_Source_Files return Nat;
255 -- Number of source file table entries
257 procedure Initialize;
258 -- Initialize internal tables
261 -- Lock internal tables
263 Main_Source_File : Source_File_Index;
264 -- This is set to the source file index of the main unit
266 -----------------------
267 -- Checksum Handling --
268 -----------------------
270 -- As a source file is scanned, a checksum is computed by taking all the
271 -- non-blank characters in the file, excluding comment characters, the
272 -- minus-minus sequence starting a comment, and all control characters
275 -- The checksum algorithm used is the standard CRC-32 algorithm, as
276 -- implemented by System.CRC32, except that we do not bother with the
277 -- final XOR with all 1 bits.
279 -- This algorithm ensures that the checksum includes all semantically
280 -- significant aspects of the program represented by the source file,
281 -- but is insensitive to layout, presence or contents of comments, wide
282 -- character representation method, or casing conventions outside strings.
284 -- Scans.Checksum is initialized appropriately at the start of scanning
285 -- a file, and copied into the Source_Checksum field of the file table
286 -- entry when the end of file is encountered.
288 -------------------------------------
289 -- Handling Generic Instantiations --
290 -------------------------------------
292 -- As described in Sem_Ch12, a generic instantiation involves making a
293 -- copy of the tree of the generic template. The source locations in
294 -- this tree directly reference the source of the template. However it
295 -- is also possible to find the location of the instantiation.
297 -- This is achieved as follows. When an instantiation occurs, a new entry
298 -- is made in the source file table. This entry points to the same source
299 -- text, i.e. the file that contains the instantiation, but has a distinct
300 -- set of Source_Ptr index values. The separate range of Sloc values avoids
301 -- confusion, and means that the Sloc values can still be used to uniquely
302 -- identify the source file table entry. It is possible for both entries
303 -- to point to the same text, because of the virtual origin pointers used
304 -- in the source table.
306 -- The Instantiation field of this source file index entry, usually set
307 -- to No_Source_File, instead contains the Sloc of the instantiation. In
308 -- the case of nested instantiations, this Sloc may itself refer to an
309 -- instantiation, so the complete chain can be traced.
311 -- Two routines are used to build these special entries in the source
312 -- file table. Create_Instantiation_Source is first called to build
313 -- the virtual source table entry for the instantiation, and then the
314 -- Sloc values in the copy are adjusted using Adjust_Instantiation_Sloc.
315 -- See child unit Sinput.L for details on these two routines.
321 Current_Source_File : Source_File_Index;
322 -- Source_File table index of source file currently being scanned
324 Current_Source_Unit : Unit_Number_Type;
325 -- Unit number of source file currently being scanned. The special value
326 -- of No_Unit indicates that the configuration pragma file is currently
327 -- being scanned (this has no entry in the unit table).
329 Source_gnat_adc : Source_File_Index := No_Source_File;
330 -- This is set if a gnat.adc file is present to reference this file
332 Source : Source_Buffer_Ptr;
333 -- Current source (copy of Source_File.Table (Current_Source_Unit).Source)
335 Internal_Source : aliased Source_Buffer (1 .. 81);
336 -- This buffer is used internally in the compiler when the lexical analyzer
337 -- is used to scan a string from within the compiler. The procedure is to
338 -- establish Internal_Source_Ptr as the value of Source, set the string to
339 -- be scanned, appropriately terminated, in this buffer, and set Scan_Ptr
340 -- to point to the start of the buffer. It is a fatal error if the scanner
341 -- signals an error while scanning a token in this internal buffer.
343 Internal_Source_Ptr : constant Source_Buffer_Ptr :=
344 Internal_Source'Unrestricted_Access;
345 -- Pointer to internal source buffer
351 procedure Backup_Line (P : in out Source_Ptr);
352 -- Back up the argument pointer to the start of the previous line. On
353 -- entry, P points to the start of a physical line in the source buffer.
354 -- On return, P is updated to point to the start of the previous line.
355 -- The caller has checked that a Line_Terminator character precedes P so
356 -- that there definitely is a previous line in the source buffer.
358 procedure Build_Location_String (Loc : Source_Ptr);
359 -- This function builds a string literal of the form "name:line",
360 -- where name is the file name corresponding to Loc, and line is
361 -- the line number. In the event that instantiations are involved,
362 -- additional suffixes of the same form are appended after the
363 -- separating string " instantiated at ". The returned string is
364 -- stored in Name_Buffer, terminated by ASCII.Nul, with Name_Length
365 -- indicating the length not including the terminating Nul.
367 function Get_Column_Number (P : Source_Ptr) return Column_Number;
368 -- The ones-origin column number of the specified Source_Ptr value is
369 -- determined and returned. Tab characters if present are assumed to
370 -- represent the standard 1,9,17.. spacing pattern.
372 function Get_Logical_Line_Number
374 return Logical_Line_Number;
375 -- The line number of the specified source position is obtained by
376 -- doing a binary search on the source positions in the lines table
377 -- for the unit containing the given source position. The returned
378 -- value is the logical line number, already adjusted for the effect
379 -- of source reference pragmas. If P refers to the line of a source
380 -- reference pragma itself, then No_Line is returned. If no source
381 -- reference pragmas have been encountered, the value returned is
382 -- the same as the physical line number.
384 function Get_Physical_Line_Number
386 return Physical_Line_Number;
387 -- The line number of the specified source position is obtained by
388 -- doing a binary search on the source positions in the lines table
389 -- for the unit containing the given source position. The returned
390 -- value is the physical line number in the source being compiled.
392 function Get_Source_File_Index (S : Source_Ptr) return Source_File_Index;
393 -- Return file table index of file identified by given source pointer
394 -- value. This call must always succeed, since any valid source pointer
395 -- value belongs to some previously loaded source file.
397 function Instantiation_Depth (S : Source_Ptr) return Nat;
398 -- Determine instantiation depth for given Sloc value. A value of
399 -- zero means that the given Sloc is not in an instantiation.
401 function Line_Start (P : Source_Ptr) return Source_Ptr;
402 -- Finds the source position of the start of the line containing the
403 -- given source location.
406 (L : Physical_Line_Number;
407 S : Source_File_Index)
409 -- Finds the source position of the start of the given line in the
410 -- given source file, using a physical line number to identify the line.
412 function Num_Source_Lines (S : Source_File_Index) return Nat;
413 -- Returns the number of source lines (this is equivalent to reading
414 -- the value of Last_Source_Line, but returns Nat rathern than a
415 -- physical line number.
417 procedure Register_Source_Ref_Pragma
418 (File_Name : Name_Id;
419 Stripped_File_Name : Name_Id;
421 Line_After_Pragma : Physical_Line_Number);
422 -- Register a source reference pragma, the parameter File_Name is the
423 -- file name from the pragma, and Stripped_File_Name is this name with
424 -- the directory information stripped. Both these parameters are set
425 -- to No_Name if no file name parameter was given in the pragma.
426 -- (which can only happen for the second and subsequent pragmas).
427 -- Mapped_Line is the line number parameter from the pragma, and
428 -- Line_After_Pragma is the physical line number of the line that
429 -- follows the line containing the Source_Reference pragma.
431 function Original_Location (S : Source_Ptr) return Source_Ptr;
432 -- Given a source pointer S, returns the corresponding source pointer
433 -- value ignoring instantiation copies. For locations that do not
434 -- correspond to instantiation copies of templates, the argument is
435 -- returned unchanged. For locations that do correspond to copies of
436 -- templates from instantiations, the location within the original
437 -- template is returned. This is useful in canonicalizing locations.
439 function Instantiation_Location (S : Source_Ptr) return Source_Ptr;
440 pragma Inline (Instantiation_Location);
441 -- Given a source pointer S, returns the corresponding source pointer
442 -- value of the instantiation if this location is within an instance.
443 -- If S is not within an instance, then this returns No_Location.
445 function Top_Level_Location (S : Source_Ptr) return Source_Ptr;
446 -- Given a source pointer S, returns the argument unchanged if it is
447 -- not in an instantiation. If S is in an instantiation, then it returns
448 -- the location of the top level instantiation, i.e. the outer level
449 -- instantiation in the nested case.
451 function Physical_To_Logical
452 (Line : Physical_Line_Number;
453 S : Source_File_Index)
454 return Logical_Line_Number;
455 -- Given a physical line number in source file whose source index is S,
456 -- return the corresponding logical line number. If the physical line
457 -- number is one containing a Source_Reference pragma, the result will
458 -- be No_Line_Number.
460 procedure Skip_Line_Terminators
461 (P : in out Source_Ptr;
462 Physical : out Boolean);
463 -- On entry, Source (P) points to the line terminator character that
464 -- terminates a line. The result set in P is the location of the first
465 -- character of the following line (after skipping the sequence of line
466 -- terminator characters terminating the current line). In addition, if
467 -- the terminator sequence ends a physical line (the definition of what
468 -- constitutes a physical line is embodied in the implementation of this
469 -- function), and it is the first time this sequence is encountered, then
470 -- an entry is made in the lines table to record the location for further
471 -- use by functions such as Get_Line_Number. Physical is set to True if
472 -- the line terminator was the end of a physical line.
474 function Source_Offset (S : Source_Ptr) return Nat;
475 -- Returns the zero-origin offset of the given source location from the
476 -- start of its corresponding unit. This is used for creating canonical
477 -- names in some situations.
479 procedure Write_Location (P : Source_Ptr);
480 -- Writes out a string of the form fff:nn:cc, where fff, nn, cc are the
481 -- file name, line number and column corresponding to the given source
482 -- location. No_Location and Standard_Location appear as the strings
483 -- <no location> and <standard location>. If the location is within an
484 -- instantiation, then the instance location is appended, enclosed in
485 -- square brackets (which can nest if necessary). Note that this routine
486 -- is used only for internal compiler debugging output purposes (which
487 -- is why the somewhat cryptic use of brackets is acceptable).
489 procedure wl (P : Source_Ptr);
490 pragma Export (Ada, wl);
491 -- Equivalent to Write_Location (P); Write_Eol; for calls from GDB
493 procedure Write_Time_Stamp (S : Source_File_Index);
494 -- Writes time stamp of specified file in YY-MM-DD HH:MM.SS format
496 procedure Tree_Write;
497 -- Writes out internal tables to current tree file using Tree_Write
500 -- Initializes internal tables from current tree file using Tree_Read
503 pragma Inline (File_Name);
504 pragma Inline (First_Mapped_Line);
505 pragma Inline (Full_File_Name);
506 pragma Inline (Identifier_Casing);
507 pragma Inline (Instantiation);
508 pragma Inline (Keyword_Casing);
509 pragma Inline (Last_Source_Line);
510 pragma Inline (Last_Source_File);
511 pragma Inline (License);
512 pragma Inline (Num_SRef_Pragmas);
513 pragma Inline (Num_Source_Files);
514 pragma Inline (Num_Source_Lines);
515 pragma Inline (Reference_Name);
516 pragma Inline (Set_Keyword_Casing);
517 pragma Inline (Set_Identifier_Casing);
518 pragma Inline (Source_First);
519 pragma Inline (Source_Last);
520 pragma Inline (Source_Text);
521 pragma Inline (Template);
522 pragma Inline (Time_Stamp);
524 -------------------------
525 -- Source_Lines Tables --
526 -------------------------
528 type Lines_Table_Type is
529 array (Physical_Line_Number) of Source_Ptr;
530 -- Type used for lines table. The entries are indexed by physical line
531 -- numbers. The values are the starting Source_Ptr values for the start
532 -- of the corresponding physical line. Note that we make this a bogus
533 -- big array, sized as required, so that we avoid the use of fat pointers.
535 type Lines_Table_Ptr is access all Lines_Table_Type;
536 -- Type used for pointers to line tables
538 type Logical_Lines_Table_Type is
539 array (Physical_Line_Number) of Logical_Line_Number;
540 -- Type used for logical lines table. This table is used if a source
541 -- reference pragma is present. It is indexed by physical line numbers,
542 -- and contains the corresponding logical line numbers. An entry that
543 -- corresponds to a source reference pragma is set to No_Line_Number.
544 -- Note that we make this a bogus big array, sized as required, so that
545 -- we avoid the use of fat pointers.
547 type Logical_Lines_Table_Ptr is access all Logical_Lines_Table_Type;
548 -- Type used for pointers to logical line tables.
550 -----------------------
551 -- Source_File Table --
552 -----------------------
554 -- See earlier descriptions for meanings of public fields
556 type Source_File_Record is record
558 File_Name : File_Name_Type;
559 Reference_Name : File_Name_Type;
560 Debug_Source_Name : File_Name_Type;
561 Full_File_Name : File_Name_Type;
562 Full_Ref_Name : File_Name_Type;
563 License : License_Type;
564 Num_SRef_Pragmas : Nat;
565 First_Mapped_Line : Logical_Line_Number;
566 Source_Text : Source_Buffer_Ptr;
567 Source_First : Source_Ptr;
568 Source_Last : Source_Ptr;
569 Time_Stamp : Time_Stamp_Type;
570 Source_Checksum : Word;
571 Last_Source_Line : Physical_Line_Number;
572 Keyword_Casing : Casing_Type;
573 Identifier_Casing : Casing_Type;
574 Instantiation : Source_Ptr;
575 Template : Source_File_Index;
577 -- The following fields are for internal use only (i.e. only in the
578 -- body of Sinput or its children, with no direct access by clients).
580 Sloc_Adjust : Source_Ptr;
581 -- A value to be added to Sloc values for this file to reference the
582 -- corresponding lines table. This is zero for the non-instantiation
583 -- case, and set so that the adition references the ultimate template
584 -- for the instantiation case. See Sinput-L for further details.
586 Lines_Table : Lines_Table_Ptr;
587 -- Pointer to lines table for this source. Updated as additional
588 -- lines are accessed using the Skip_Line_Terminators procedure.
589 -- Note: the lines table for an instantiation entry refers to the
590 -- original line numbers of the template see Sinput-L for details.
592 Logical_Lines_Table : Logical_Lines_Table_Ptr;
593 -- Pointer to logical lines table for this source. Non-null only if
594 -- a source reference pragma has been processed. Updated as lines
595 -- are accessed using the Skip_Line_Terminators procedure.
597 Lines_Table_Max : Physical_Line_Number;
598 -- Maximum subscript values for currently allocated Lines_Table
599 -- and (if present) the allocated Logical_Lines_Table. The value
600 -- Max_Source_Line gives the maximum used value, this gives the
601 -- maximum allocated value.
605 package Source_File is new Table.Table (
606 Table_Component_Type => Source_File_Record,
607 Table_Index_Type => Source_File_Index,
608 Table_Low_Bound => 1,
609 Table_Initial => Alloc.Source_File_Initial,
610 Table_Increment => Alloc.Source_File_Increment,
611 Table_Name => "Source_File");
617 procedure Alloc_Line_Tables
618 (S : in out Source_File_Record;
620 -- Allocate or reallocate the lines table for the given source file so
621 -- that it can accommodate at least New_Max lines. Also allocates or
622 -- reallocates logical lines table if source ref pragmas are present.
624 procedure Add_Line_Tables_Entry
625 (S : in out Source_File_Record;
627 -- Increment line table size by one (reallocating the lines table if
628 -- needed) and set the new entry to contain the value P. Also bumps
629 -- the Source_Line_Count field. If source reference pragmas are
630 -- present, also increments logical lines table size by one, and
633 procedure Trim_Lines_Table (S : Source_File_Index);
634 -- Set lines table size for entry S in the source file table to
635 -- correspond to the current value of Num_Source_Lines, releasing
636 -- any unused storage. This is used by Sinput.L and Sinput.D.
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