1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                                T Y P E S                                 --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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 host independent type definitions which are used
33--  in more than one unit in the compiler. They are gathered here for easy
34--  reference, although in some cases the full description is found in the
35--  relevant module which implements the definition. The main reason that they
36--  are not in their "natural" specs is that this would cause a lot of inter-
37--  spec dependencies, and in particular some awkward circular dependencies
38--  would have to be dealt with.
39
40--  WARNING: There is a C version of this package. Any changes to this source
41--  file must be properly reflected in the C header file types.h declarations.
42
43--  Note: the declarations in this package reflect an expectation that the host
44--  machine has an efficient integer base type with a range at least 32 bits
45--  2s-complement. If there are any machines for which this is not a correct
46--  assumption, a significant number of changes will be required.
47
48with System;
49with Unchecked_Conversion;
50with Unchecked_Deallocation;
51
52package Types is
53   pragma Preelaborate;
54
55   -------------------------------
56   -- General Use Integer Types --
57   -------------------------------
58
59   type Int is range -2 ** 31 .. +2 ** 31 - 1;
60   --  Signed 32-bit integer
61
62   subtype Nat is Int range 0 .. Int'Last;
63   --  Non-negative Int values
64
65   subtype Pos is Int range 1 .. Int'Last;
66   --  Positive Int values
67
68   type Word is mod 2 ** 32;
69   --  Unsigned 32-bit integer
70
71   type Short is range -32768 .. +32767;
72   for Short'Size use 16;
73   --  16-bit signed integer
74
75   type Byte is mod 2 ** 8;
76   for Byte'Size use 8;
77   --  8-bit unsigned integer
78
79   type size_t is mod 2 ** Standard'Address_Size;
80   --  Memory size value, for use in calls to C routines
81
82   --------------------------------------
83   -- 8-Bit Character and String Types --
84   --------------------------------------
85
86   --  We use Standard.Character and Standard.String freely, since we are
87   --  compiling ourselves, and we properly implement the required 8-bit
88   --  character code as required in Ada 95. This section defines a few
89   --  general use constants and subtypes.
90
91   EOF : constant Character := ASCII.SUB;
92   --  The character SUB (16#1A#) is used in DOS and other systems derived
93   --  from DOS (XP, NT etc) to signal the end of a text file. Internally
94   --  all source files are ended by an EOF character, even on Unix systems.
95   --  An EOF character acts as the end of file only as the last character
96   --  of a source buffer, in any other position, it is treated as a blank
97   --  if it appears between tokens, and as an illegal character otherwise.
98   --  This makes life easier dealing with files that originated from DOS,
99   --  including concatenated files with interspersed EOF characters.
100
101   subtype Graphic_Character is Character range ' ' .. '~';
102   --  Graphic characters, as defined in ARM
103
104   subtype Line_Terminator is Character range ASCII.LF .. ASCII.CR;
105   --  Line terminator characters (LF, VT, FF, CR). For further details, see
106   --  the extensive discussion of line termination in the Sinput spec.
107
108   subtype Upper_Half_Character is
109     Character range Character'Val (16#80#) .. Character'Val (16#FF#);
110   --  Characters with the upper bit set
111
112   type Character_Ptr is access all Character;
113   type String_Ptr    is access all String;
114   --  Standard character and string pointers
115
116   procedure Free is new Unchecked_Deallocation (String, String_Ptr);
117   --  Procedure for freeing dynamically allocated String values
118
119   subtype Big_String is String (Positive);
120   type Big_String_Ptr is access all Big_String;
121   --  Virtual type for handling imported big strings. Note that we should
122   --  never have any allocators for this type, but we don't give a storage
123   --  size of zero, since there are legitimate deallocations going on.
124
125   function To_Big_String_Ptr is
126     new Unchecked_Conversion (System.Address, Big_String_Ptr);
127   --  Used to obtain Big_String_Ptr values from external addresses
128
129   subtype Word_Hex_String is String (1 .. 8);
130   --  Type used to represent Word value as 8 hex digits, with lower case
131   --  letters for the alphabetic cases.
132
133   function Get_Hex_String (W : Word) return Word_Hex_String;
134   --  Convert word value to 8-character hex string
135
136   -----------------------------------------
137   -- Types Used for Text Buffer Handling --
138   -----------------------------------------
139
140   --  We can not use type String for text buffers, since we must use the
141   --  standard 32-bit integer as an index value, since we count on all index
142   --  values being the same size.
143
144   type Text_Ptr is new Int;
145   --  Type used for subscripts in text buffer
146
147   type Text_Buffer is array (Text_Ptr range <>) of Character;
148   --  Text buffer used to hold source file or library information file
149
150   type Text_Buffer_Ptr is access all Text_Buffer;
151   --  Text buffers for input files are allocated dynamically and this type
152   --  is used to reference these text buffers.
153
154   procedure Free is new Unchecked_Deallocation (Text_Buffer, Text_Buffer_Ptr);
155   --  Procedure for freeing dynamically allocated text buffers
156
157   ------------------------------------------
158   -- Types Used for Source Input Handling --
159   ------------------------------------------
160
161   type Logical_Line_Number is range 0 .. Int'Last;
162   for Logical_Line_Number'Size use 32;
163   --  Line number type, used for storing logical line numbers (i.e. line
164   --  numbers that include effects of any Source_Reference pragmas in the
165   --  source file). The value zero indicates a line containing a source
166   --  reference pragma.
167
168   No_Line_Number : constant Logical_Line_Number := 0;
169   --  Special value used to indicate no line number
170
171   type Physical_Line_Number is range 1 .. Int'Last;
172   for Physical_Line_Number'Size use 32;
173   --  Line number type, used for storing physical line numbers (i.e. line
174   --  numbers in the physical file being compiled, unaffected by the presence
175   --  of source reference pragmas).
176
177   type Column_Number is range 0 .. 32767;
178   for Column_Number'Size use 16;
179   --  Column number (assume that 2**15 - 1 is large enough). The range for
180   --  this type is used to compute Hostparm.Max_Line_Length. See also the
181   --  processing for -gnatyM in Stylesw).
182
183   No_Column_Number : constant Column_Number := 0;
184   --  Special value used to indicate no column number
185
186   Source_Align : constant := 2 ** 12;
187   --  Alignment requirement for source buffers (by keeping source buffers
188   --  aligned, we can optimize the implementation of Get_Source_File_Index.
189   --  See this routine in Sinput for details.
190
191   subtype Source_Buffer is Text_Buffer;
192   --  Type used to store text of a source file. The buffer for the main
193   --  source (the source specified on the command line) has a lower bound
194   --  starting at zero. Subsequent subsidiary sources have lower bounds
195   --  which are one greater than the previous upper bound, rounded up to
196   --  a multiple of Source_Align.
197
198   subtype Big_Source_Buffer is Text_Buffer (0 .. Text_Ptr'Last);
199   --  This is a virtual type used as the designated type of the access type
200   --  Source_Buffer_Ptr, see Osint.Read_Source_File for details.
201
202   type Source_Buffer_Ptr is access all Big_Source_Buffer;
203   --  Pointer to source buffer. We use virtual origin addressing for source
204   --  buffers, with thin pointers. The pointer points to a virtual instance
205   --  of type Big_Source_Buffer, where the actual type is in fact of type
206   --  Source_Buffer. The address is adjusted so that the virtual origin
207   --  addressing works correctly. See Osint.Read_Source_Buffer for further
208   --  details. Again, as for Big_String_Ptr, we should never allocate using
209   --  this type, but we don't give a storage size clause of zero, since we
210   --  may end up doing deallocations of instances allocated manually.
211
212   subtype Source_Ptr is Text_Ptr;
213   --  Type used to represent a source location, which is a subscript of a
214   --  character in the source buffer. As noted above, different source buffers
215   --  have different ranges, so it is possible to tell from a Source_Ptr value
216   --  which source it refers to. Note that negative numbers are allowed to
217   --  accommodate the following special values.
218
219   No_Location : constant Source_Ptr := -1;
220   --  Value used to indicate no source position set in a node. A test for a
221   --  Source_Ptr value being > No_Location is the approved way to test for a
222   --  standard value that does not include No_Location or any of the following
223   --  special definitions. One important use of No_Location is to label
224   --  generated nodes that we don't want the debugger to see in normal mode
225   --  (very often we conditionalize so that we set No_Location in normal mode
226   --  and the corresponding source line in -gnatD mode).
227
228   Standard_Location : constant Source_Ptr := -2;
229   --  Used for all nodes in the representation of package Standard other than
230   --  nodes representing the contents of Standard.ASCII. Note that testing for
231   --  a value being <= Standard_Location tests for both Standard_Location and
232   --  for Standard_ASCII_Location.
233
234   Standard_ASCII_Location : constant Source_Ptr := -3;
235   --  Used for all nodes in the presentation of package Standard.ASCII
236
237   System_Location : constant Source_Ptr := -4;
238   --  Used to identify locations of pragmas scanned by Targparm, where we know
239   --  the location is in System, but we don't know exactly what line.
240
241   First_Source_Ptr : constant Source_Ptr := 0;
242   --  Starting source pointer index value for first source program
243
244   -------------------------------------
245   -- Range Definitions for Tree Data --
246   -------------------------------------
247
248   --  The tree has fields that can hold any of the following types:
249
250   --    Pointers to other tree nodes (type Node_Id)
251   --    List pointers (type List_Id)
252   --    Element list pointers (type Elist_Id)
253   --    Names (type Name_Id)
254   --    Strings (type String_Id)
255   --    Universal integers (type Uint)
256   --    Universal reals (type Ureal)
257
258   --  In most contexts, the strongly typed interface determines which of these
259   --  types is present. However, there are some situations (involving untyped
260   --  traversals of the tree), where it is convenient to be easily able to
261   --  distinguish these values. The underlying representation in all cases is
262   --  an integer type Union_Id, and we ensure that the range of the various
263   --  possible values for each of the above types is disjoint so that this
264   --  distinction is possible.
265
266   --  Note: it is also helpful for debugging purposes to make these ranges
267   --  distinct. If a bug leads to misidentification of a value, then it will
268   --  typically result in an out of range value and a Constraint_Error.
269
270   type Union_Id is new Int;
271   --  The type in the tree for a union of possible ID values
272
273   List_Low_Bound : constant := -100_000_000;
274   --  The List_Id values are subscripts into an array of list headers which
275   --  has List_Low_Bound as its lower bound. This value is chosen so that all
276   --  List_Id values are negative, and the value zero is in the range of both
277   --  List_Id and Node_Id values (see further description below).
278
279   List_High_Bound : constant := 0;
280   --  Maximum List_Id subscript value. This allows up to 100 million list Id
281   --  values, which is in practice infinite, and there is no need to check the
282   --  range. The range overlaps the node range by one element (with value
283   --  zero), which is used both for the Empty node, and for indicating no
284   --  list. The fact that the same value is used is convenient because it
285   --  means that the default value of Empty applies to both nodes and lists,
286   --  and also is more efficient to test for.
287
288   Node_Low_Bound : constant := 0;
289   --  The tree Id values start at zero, because we use zero for Empty (to
290   --  allow a zero test for Empty). Actual tree node subscripts start at 0
291   --  since Empty is a legitimate node value.
292
293   Node_High_Bound : constant := 099_999_999;
294   --  Maximum number of nodes that can be allocated is 100 million, which
295   --  is in practice infinite, and there is no need to check the range.
296
297   Elist_Low_Bound : constant := 100_000_000;
298   --  The Elist_Id values are subscripts into an array of elist headers which
299   --  has Elist_Low_Bound as its lower bound.
300
301   Elist_High_Bound : constant := 199_999_999;
302   --  Maximum Elist_Id subscript value. This allows up to 100 million Elists,
303   --  which is in practice infinite and there is no need to check the range.
304
305   Elmt_Low_Bound : constant := 200_000_000;
306   --  Low bound of element Id values. The use of these values is internal to
307   --  the Elists package, but the definition of the range is included here
308   --  since it must be disjoint from other Id values. The Elmt_Id values are
309   --  subscripts into an array of list elements which has this as lower bound.
310
311   Elmt_High_Bound : constant := 299_999_999;
312   --  Upper bound of Elmt_Id values. This allows up to 100 million element
313   --  list members, which is in practice infinite (no range check needed).
314
315   Names_Low_Bound : constant := 300_000_000;
316   --  Low bound for name Id values
317
318   Names_High_Bound : constant := 399_999_999;
319   --  Maximum number of names that can be allocated is 100 million, which is
320   --  in practice infinite and there is no need to check the range.
321
322   Strings_Low_Bound : constant := 400_000_000;
323   --  Low bound for string Id values
324
325   Strings_High_Bound : constant := 499_999_999;
326   --  Maximum number of strings that can be allocated is 100 million, which
327   --  is in practice infinite and there is no need to check the range.
328
329   Ureal_Low_Bound : constant := 500_000_000;
330   --  Low bound for Ureal values
331
332   Ureal_High_Bound : constant := 599_999_999;
333   --  Maximum number of Ureal values stored is 100_000_000 which is in
334   --  practice infinite so that no check is required.
335
336   Uint_Low_Bound : constant := 600_000_000;
337   --  Low bound for Uint values
338
339   Uint_Table_Start : constant := 2_000_000_000;
340   --  Location where table entries for universal integers start (see
341   --  Uintp spec for details of the representation of Uint values).
342
343   Uint_High_Bound : constant := 2_099_999_999;
344   --  The range of Uint values is very large, since a substantial part
345   --  of this range is used to store direct values, see Uintp for details.
346
347   --  The following subtype definitions are used to provide convenient names
348   --  for membership tests on Int values to see what data type range they
349   --  lie in. Such tests appear only in the lowest level packages.
350
351   subtype List_Range      is Union_Id
352     range List_Low_Bound    .. List_High_Bound;
353
354   subtype Node_Range      is Union_Id
355     range Node_Low_Bound    .. Node_High_Bound;
356
357   subtype Elist_Range     is Union_Id
358     range Elist_Low_Bound   .. Elist_High_Bound;
359
360   subtype Elmt_Range      is Union_Id
361     range Elmt_Low_Bound    .. Elmt_High_Bound;
362
363   subtype Names_Range     is Union_Id
364     range Names_Low_Bound   .. Names_High_Bound;
365
366   subtype Strings_Range   is Union_Id
367     range Strings_Low_Bound .. Strings_High_Bound;
368
369   subtype Uint_Range      is Union_Id
370     range Uint_Low_Bound    .. Uint_High_Bound;
371
372   subtype Ureal_Range     is Union_Id
373     range Ureal_Low_Bound   .. Ureal_High_Bound;
374
375   -----------------------------
376   -- Types for Atree Package --
377   -----------------------------
378
379   --  Node_Id values are used to identify nodes in the tree. They are
380   --  subscripts into the Nodes table declared in package Atree. Note that
381   --  the special values Empty and Error are subscripts into this table.
382   --  See package Atree for further details.
383
384   type Node_Id is range Node_Low_Bound .. Node_High_Bound;
385   --  Type used to identify nodes in the tree
386
387   subtype Entity_Id is Node_Id;
388   --  A synonym for node types, used in the Einfo package to refer to nodes
389   --  that are entities (i.e. nodes with an Nkind of N_Defining_xxx). All such
390   --  nodes are extended nodes and these are the only extended nodes, so that
391   --  in practice entity and extended nodes are synonymous.
392
393   subtype Node_Or_Entity_Id is Node_Id;
394   --  A synonym for node types, used in cases where a given value may be used
395   --  to represent either a node or an entity. We like to minimize such uses
396   --  for obvious reasons of logical type consistency, but where such uses
397   --  occur, they should be documented by use of this type.
398
399   Empty : constant Node_Id := Node_Low_Bound;
400   --  Used to indicate null node. A node is actually allocated with this
401   --  Id value, so that Nkind (Empty) = N_Empty. Note that Node_Low_Bound
402   --  is zero, so Empty = No_List = zero.
403
404   Empty_List_Or_Node : constant := 0;
405   --  This constant is used in situations (e.g. initializing empty fields)
406   --  where the value set will be used to represent either an empty node or
407   --  a non-existent list, depending on the context.
408
409   Error : constant Node_Id := Node_Low_Bound + 1;
410   --  Used to indicate an error in the source program. A node is actually
411   --  allocated with this Id value, so that Nkind (Error) = N_Error.
412
413   Empty_Or_Error : constant Node_Id := Error;
414   --  Since Empty and Error are the first two Node_Id values, the test for
415   --  N <= Empty_Or_Error tests to see if N is Empty or Error. This definition
416   --  provides convenient self-documentation for such tests.
417
418   First_Node_Id  : constant Node_Id := Node_Low_Bound;
419   --  Subscript of first allocated node. Note that Empty and Error are both
420   --  allocated nodes, whose Nkind fields can be accessed without error.
421
422   ------------------------------
423   -- Types for Nlists Package --
424   ------------------------------
425
426   --  List_Id values are used to identify node lists stored in the tree, so
427   --  that each node can be on at most one such list (see package Nlists for
428   --  further details). Note that the special value Error_List is a subscript
429   --  in this table, but the value No_List is *not* a valid subscript, and any
430   --  attempt to apply list operations to No_List will cause a (detected)
431   --  error.
432
433   type List_Id is range List_Low_Bound .. List_High_Bound;
434   --  Type used to identify a node list
435
436   No_List : constant List_Id := List_High_Bound;
437   --  Used to indicate absence of a list. Note that the value is zero, which
438   --  is the same as Empty, which is helpful in initializing nodes where a
439   --  value of zero can represent either an empty node or an empty list.
440
441   Error_List : constant List_Id := List_Low_Bound;
442   --  Used to indicate that there was an error in the source program in a
443   --  context which would normally require a list. This node appears to be
444   --  an empty list to the list operations (a null list is actually allocated
445   --  which has this Id value).
446
447   First_List_Id : constant List_Id := Error_List;
448   --  Subscript of first allocated list header
449
450   ------------------------------
451   -- Types for Elists Package --
452   ------------------------------
453
454   --  Element list Id values are used to identify element lists stored outside
455   --  of the tree, allowing nodes to be members of more than one such list
456   --  (see package Elists for further details).
457
458   type Elist_Id is range Elist_Low_Bound .. Elist_High_Bound;
459   --  Type used to identify an element list (Elist header table subscript)
460
461   No_Elist : constant Elist_Id := Elist_Low_Bound;
462   --  Used to indicate absence of an element list. Note that this is not an
463   --  actual Elist header, so element list operations on this value are not
464   --  valid.
465
466   First_Elist_Id : constant Elist_Id := No_Elist + 1;
467   --  Subscript of first allocated Elist header
468
469   --  Element Id values are used to identify individual elements of an element
470   --  list (see package Elists for further details).
471
472   type Elmt_Id is range Elmt_Low_Bound .. Elmt_High_Bound;
473   --  Type used to identify an element list
474
475   No_Elmt : constant Elmt_Id := Elmt_Low_Bound;
476   --  Used to represent empty element
477
478   First_Elmt_Id : constant Elmt_Id := No_Elmt + 1;
479   --  Subscript of first allocated Elmt table entry
480
481   -------------------------------
482   -- Types for Stringt Package --
483   -------------------------------
484
485   --  String_Id values are used to identify entries in the strings table. They
486   --  are subscripts into the Strings table defined in package Stringt.
487
488   --  Note that with only a few exceptions, which are clearly documented, the
489   --  type String_Id should be regarded as a private type. In particular it is
490   --  never appropriate to perform arithmetic operations using this type.
491   --  Doesn't this also apply to all other *_Id types???
492
493   type String_Id is range Strings_Low_Bound .. Strings_High_Bound;
494   --  Type used to identify entries in the strings table
495
496   No_String : constant String_Id := Strings_Low_Bound;
497   --  Used to indicate missing string Id. Note that the value zero is used
498   --  to indicate a missing data value for all the Int types in this section.
499
500   First_String_Id : constant String_Id := No_String + 1;
501   --  First subscript allocated in string table
502
503   -------------------------
504   -- Character Code Type --
505   -------------------------
506
507   --  The type Char is used for character data internally in the compiler, but
508   --  character codes in the source are represented by the Char_Code type.
509   --  Each character literal in the source is interpreted as being one of the
510   --  16#7FFF_FFFF# possible Wide_Wide_Character codes, and a unique Integer
511   --  value is assigned, corresponding to the UTF-32 value, which also
512   --  corresponds to the Pos value in the Wide_Wide_Character type, and also
513   --  corresponds to the Pos value in the Wide_Character and Character types
514   --  for values that are in appropriate range. String literals are similarly
515   --  interpreted as a sequence of such codes.
516
517   type Char_Code_Base is mod 2 ** 32;
518   for Char_Code_Base'Size use 32;
519
520   subtype Char_Code is Char_Code_Base range 0 .. 16#7FFF_FFFF#;
521   for Char_Code'Value_Size use 32;
522   for Char_Code'Object_Size use 32;
523
524   function Get_Char_Code (C : Character) return Char_Code;
525   pragma Inline (Get_Char_Code);
526   --  Function to obtain internal character code from source character. For
527   --  the moment, the internal character code is simply the Pos value of the
528   --  input source character, but we provide this interface for possible
529   --  later support of alternative character sets.
530
531   function In_Character_Range (C : Char_Code) return Boolean;
532   pragma Inline (In_Character_Range);
533   --  Determines if the given character code is in range of type Character,
534   --  and if so, returns True. If not, returns False.
535
536   function In_Wide_Character_Range (C : Char_Code) return Boolean;
537   pragma Inline (In_Wide_Character_Range);
538   --  Determines if the given character code is in range of the type
539   --  Wide_Character, and if so, returns True. If not, returns False.
540
541   function Get_Character (C : Char_Code) return Character;
542   pragma Inline (Get_Character);
543   --  For a character C that is in Character range (see above function), this
544   --  function returns the corresponding Character value. It is an error to
545   --  call Get_Character if C is not in Character range.
546
547   function Get_Wide_Character (C : Char_Code) return Wide_Character;
548   --  For a character C that is in Wide_Character range (see above function),
549   --  this function returns the corresponding Wide_Character value. It is an
550   --  error to call Get_Wide_Character if C is not in Wide_Character range.
551
552   ---------------------------------------
553   -- Types used for Library Management --
554   ---------------------------------------
555
556   type Unit_Number_Type is new Int;
557   --  Unit number. The main source is unit 0, and subsidiary sources have
558   --  non-zero numbers starting with 1. Unit numbers are used to index the
559   --  Units table in package Lib.
560
561   Main_Unit : constant Unit_Number_Type := 0;
562   --  Unit number value for main unit
563
564   No_Unit : constant Unit_Number_Type := -1;
565   --  Special value used to signal no unit
566
567   type Source_File_Index is new Int range -1 .. Int'Last;
568   --  Type used to index the source file table (see package Sinput)
569
570   Internal_Source_File : constant Source_File_Index :=
571                            Source_File_Index'First;
572   --  Value used to indicate the buffer for the source-code-like strings
573   --  internally created withing the compiler (see package Sinput)
574
575   No_Source_File : constant Source_File_Index := 0;
576   --  Value used to indicate no source file present
577
578   -----------------------------------
579   -- Representation of Time Stamps --
580   -----------------------------------
581
582   --  All compiled units are marked with a time stamp which is derived from
583   --  the source file (we assume that the host system has the concept of a
584   --  file time stamp which is modified when a file is modified). These
585   --  time stamps are used to ensure consistency of the set of units that
586   --  constitutes a library. Time stamps are 14-character strings with
587   --  with the following format:
588
589   --     YYYYMMDDHHMMSS
590
591   --       YYYY   year
592   --       MM     month (2 digits 01-12)
593   --       DD     day (2 digits 01-31)
594   --       HH     hour (2 digits 00-23)
595   --       MM     minutes (2 digits 00-59)
596   --       SS     seconds (2 digits 00-59)
597
598   --  In the case of Unix systems (and other systems which keep the time in
599   --  GMT), the time stamp is the GMT time of the file, not the local time.
600   --  This solves problems in using libraries across networks with clients
601   --  spread across multiple time-zones.
602
603   Time_Stamp_Length : constant := 14;
604   --  Length of time stamp value
605
606   subtype Time_Stamp_Index is Natural range 1 .. Time_Stamp_Length;
607   type Time_Stamp_Type is new String (Time_Stamp_Index);
608   --  Type used to represent time stamp
609
610   Empty_Time_Stamp : constant Time_Stamp_Type := (others => ' ');
611   --  Value representing an empty or missing time stamp. Looks less than any
612   --  real time stamp if two time stamps are compared. Note that although this
613   --  is not private, clients should not rely on the exact way in which this
614   --  string is represented, and instead should use the subprograms below.
615
616   Dummy_Time_Stamp : constant Time_Stamp_Type := (others => '0');
617   --  This is used for dummy time stamp values used in the D lines for
618   --  non-existent files, and is intended to be an impossible value.
619
620   function "="  (Left, Right : Time_Stamp_Type) return Boolean;
621   function "<=" (Left, Right : Time_Stamp_Type) return Boolean;
622   function ">=" (Left, Right : Time_Stamp_Type) return Boolean;
623   function "<"  (Left, Right : Time_Stamp_Type) return Boolean;
624   function ">"  (Left, Right : Time_Stamp_Type) return Boolean;
625   --  Comparison functions on time stamps. Note that two time stamps are
626   --  defined as being equal if they have the same day/month/year and the
627   --  hour/minutes/seconds values are within 2 seconds of one another. This
628   --  deals with rounding effects in library file time stamps caused by
629   --  copying operations during installation. We have particularly noticed
630   --  that WinNT seems susceptible to such changes.
631   --
632   --  Note : the Empty_Time_Stamp value looks equal to itself, and less than
633   --  any non-empty time stamp value.
634
635   procedure Split_Time_Stamp
636     (TS      : Time_Stamp_Type;
637      Year    : out Nat;
638      Month   : out Nat;
639      Day     : out Nat;
640      Hour    : out Nat;
641      Minutes : out Nat;
642      Seconds : out Nat);
643   --  Given a time stamp, decompose it into its components
644
645   procedure Make_Time_Stamp
646     (Year    : Nat;
647      Month   : Nat;
648      Day     : Nat;
649      Hour    : Nat;
650      Minutes : Nat;
651      Seconds : Nat;
652      TS      : out Time_Stamp_Type);
653   --  Given the components of a time stamp, initialize the value
654
655   -------------------------------------
656   -- Types used for Check Management --
657   -------------------------------------
658
659   type Check_Id is new Nat;
660   --  Type used to represent a check id
661
662   No_Check_Id         : constant := 0;
663   --  Check_Id value used to indicate no check
664
665   Access_Check           : constant :=  1;
666   Accessibility_Check    : constant :=  2;
667   Alignment_Check        : constant :=  3;
668   Atomic_Synchronization : constant :=  4;
669   Discriminant_Check     : constant :=  5;
670   Division_Check         : constant :=  6;
671   Elaboration_Check      : constant :=  7;
672   Index_Check            : constant :=  8;
673   Length_Check           : constant :=  9;
674   Overflow_Check         : constant := 10;
675   Predicate_Check        : constant := 11;
676   Range_Check            : constant := 12;
677   Storage_Check          : constant := 13;
678   Tag_Check              : constant := 14;
679   Validity_Check         : constant := 15;
680   --  Values used to represent individual predefined checks (including the
681   --  setting of Atomic_Synchronization, which is implemented internally using
682   --  a "check" whose name is Atomic_Synchronization).
683
684   All_Checks : constant := 16;
685   --  Value used to represent All_Checks value
686
687   subtype Predefined_Check_Id is Check_Id range 1 .. All_Checks;
688   --  Subtype for predefined checks, including All_Checks
689
690   --  The following array contains an entry for each recognized check name
691   --  for pragma Suppress. It is used to represent current settings of scope
692   --  based suppress actions from pragma Suppress or command line settings.
693
694   --  Note: when Suppress_Array (All_Checks) is True, then generally all other
695   --  specific check entries are set True, except for the Elaboration_Check
696   --  entry which is set only if an explicit Suppress for this check is given.
697   --  The reason for this non-uniformity is that we do not want All_Checks to
698   --  suppress elaboration checking when using the static elaboration model.
699   --  We recognize only an explicit suppress of Elaboration_Check as a signal
700   --  that the static elaboration checking should skip a compile time check.
701
702   type Suppress_Array is array (Predefined_Check_Id) of Boolean;
703   pragma Pack (Suppress_Array);
704
705   --  To add a new check type to GNAT, the following steps are required:
706
707   --    1.  Add an entry to Snames spec and body for the new name
708   --    2.  Add an entry to the definition of Check_Id above
709   --    3.  Add a new function to Checks to handle the new check test
710   --    4.  Add a new Do_xxx_Check flag to Sinfo (if required)
711   --    5.  Add appropriate checks for the new test
712
713   --  The following provides precise details on the mode used to generate
714   --  code for intermediate operations in expressions for signed integer
715   --  arithmetic (and how to generate overflow checks if enabled). Note
716   --  that this only affects handling of intermediate results. The final
717   --  result must always fit within the target range, and if overflow
718   --  checking is enabled, the check on the final result is against this
719   --  target range.
720
721   type Overflow_Mode_Type is (
722      Not_Set,
723      --  Dummy value used during initialization process to show that the
724      --  corresponding value has not yet been initialized.
725
726      Strict,
727      --  Operations are done in the base type of the subexpression. If
728      --  overflow checks are enabled, then the check is against the range
729      --  of this base type.
730
731      Minimized,
732      --  Where appropriate, intermediate arithmetic operations are performed
733      --  with an extended range, using Long_Long_Integer if necessary. If
734      --  overflow checking is enabled, then the check is against the range
735      --  of Long_Long_Integer.
736
737      Eliminated);
738      --  In this mode arbitrary precision arithmetic is used as needed to
739      --  ensure that it is impossible for intermediate arithmetic to cause an
740      --  overflow. In this mode, intermediate expressions are not affected by
741      --  the overflow checking mode, since overflows are eliminated.
742
743   subtype Minimized_Or_Eliminated is
744     Overflow_Mode_Type range Minimized .. Eliminated;
745   --  Define subtype so that clients don't need to know ordering. Note that
746   --  Overflow_Mode_Type is not marked as an ordered enumeration type.
747
748   --  The following structure captures the state of check suppression or
749   --  activation at a particular point in the program execution.
750
751   type Suppress_Record is record
752      Suppress : Suppress_Array;
753      --  Indicates suppression status of each possible check
754
755      Overflow_Mode_General : Overflow_Mode_Type;
756      --  This field indicates the mode for handling code generation and
757      --  overflow checking (if enabled) for intermediate expression values.
758      --  This applies to general expressions outside assertions.
759
760      Overflow_Mode_Assertions : Overflow_Mode_Type;
761      --  This field indicates the mode for handling code generation and
762      --  overflow checking (if enabled) for intermediate expression values.
763      --  This applies to any expression occuring inside assertions.
764   end record;
765
766   -----------------------------------
767   -- Global Exception Declarations --
768   -----------------------------------
769
770   --  This section contains declarations of exceptions that are used
771   --  throughout the compiler or in other GNAT tools.
772
773   Unrecoverable_Error : exception;
774   --  This exception is raised to immediately terminate the compilation of the
775   --  current source program. Used in situations where things are bad enough
776   --  that it doesn't seem worth continuing (e.g. max errors reached, or a
777   --  required file is not found). Also raised when the compiler finds itself
778   --  in trouble after an error (see Comperr).
779
780   Terminate_Program : exception;
781   --  This exception is raised to immediately terminate the tool being
782   --  executed. Each tool where this exception may be raised must have a
783   --  single exception handler that contains only a null statement and that is
784   --  the last statement of the program. If needed, procedure Set_Exit_Status
785   --  is called with the appropriate exit status before raising
786   --  Terminate_Program.
787
788   ---------------------------------
789   -- Parameter Mechanism Control --
790   ---------------------------------
791
792   --  Function and parameter entities have a field that records the passing
793   --  mechanism. See specification of Sem_Mech for full details. The following
794   --  subtype is used to represent values of this type:
795
796   subtype Mechanism_Type is Int range -18 .. Int'Last;
797   --  Type used to represent a mechanism value. This is a subtype rather than
798   --  a type to avoid some annoying processing problems with certain routines
799   --  in Einfo (processing them to create the corresponding C).
800
801   ------------------------------
802   -- Run-Time Exception Codes --
803   ------------------------------
804
805   --  When the code generator generates a run-time exception, it provides a
806   --  reason code which is one of the following. This reason code is used to
807   --  select the appropriate run-time routine to be called, determining both
808   --  the exception to be raised, and the message text to be added.
809
810   --  The prefix CE/PE/SE indicates the exception to be raised
811   --    CE = Constraint_Error
812   --    PE = Program_Error
813   --    SE = Storage_Error
814
815   --  The remaining part of the name indicates the message text to be added,
816   --  where all letters are lower case, and underscores are converted to
817   --  spaces (for example CE_Invalid_Data adds the text "invalid data").
818
819   --  To add a new code, you need to do the following:
820
821   --    1. Modify the type and subtype declarations below appropriately,
822   --       keeping things in alphabetical order.
823
824   --    2. Modify the corresponding definitions in types.h, including the
825   --       definition of last_reason_code.
826
827   --    3. Add the name of the routines in exp_ch11.Get_RT_Exception_Name
828
829   --    4. Add a new routine in Ada.Exceptions with the appropriate call and
830   --       static string constant. Note that there is more than one version
831   --       of a-except.adb which must be modified.
832
833   type RT_Exception_Code is
834     (CE_Access_Check_Failed,            -- 00
835      CE_Access_Parameter_Is_Null,       -- 01
836      CE_Discriminant_Check_Failed,      -- 02
837      CE_Divide_By_Zero,                 -- 03
838      CE_Explicit_Raise,                 -- 04
839      CE_Index_Check_Failed,             -- 05
840      CE_Invalid_Data,                   -- 06
841      CE_Length_Check_Failed,            -- 07
842      CE_Null_Exception_Id,              -- 08
843      CE_Null_Not_Allowed,               -- 09
844      CE_Overflow_Check_Failed,          -- 10
845      CE_Partition_Check_Failed,         -- 11
846      CE_Range_Check_Failed,             -- 12
847      CE_Tag_Check_Failed,               -- 13
848
849      PE_Access_Before_Elaboration,      -- 14
850      PE_Accessibility_Check_Failed,     -- 15
851      PE_Address_Of_Intrinsic,           -- 16
852      PE_Aliased_Parameters,             -- 17
853      PE_All_Guards_Closed,              -- 18
854      PE_Bad_Predicated_Generic_Type,    -- 19
855      PE_Current_Task_In_Entry_Body,     -- 20
856      PE_Duplicated_Entry_Address,       -- 21
857      PE_Explicit_Raise,                 -- 22
858      PE_Finalize_Raised_Exception,      -- 23
859      PE_Implicit_Return,                -- 24
860      PE_Misaligned_Address_Value,       -- 25
861      PE_Missing_Return,                 -- 26
862      PE_Overlaid_Controlled_Object,     -- 27
863      PE_Potentially_Blocking_Operation, -- 28
864      PE_Stubbed_Subprogram_Called,      -- 29
865      PE_Unchecked_Union_Restriction,    -- 30
866      PE_Non_Transportable_Actual,       -- 31
867
868      SE_Empty_Storage_Pool,             -- 32
869      SE_Explicit_Raise,                 -- 33
870      SE_Infinite_Recursion,             -- 34
871      SE_Object_Too_Large);              -- 35
872
873   subtype RT_CE_Exceptions is RT_Exception_Code range
874     CE_Access_Check_Failed ..
875     CE_Tag_Check_Failed;
876
877   subtype RT_PE_Exceptions is RT_Exception_Code range
878     PE_Access_Before_Elaboration ..
879     PE_Non_Transportable_Actual;
880
881   subtype RT_SE_Exceptions is RT_Exception_Code range
882     SE_Empty_Storage_Pool ..
883     SE_Object_Too_Large;
884
885end Types;
886