1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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. --
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/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
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.
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.
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!
49 with Unchecked_Conversion;
50 with Unchecked_Deallocation;
55 -------------------------------
56 -- General Use Integer Types --
57 -------------------------------
59 type Int is range -2 ** 31 .. +2 ** 31 - 1;
60 -- Signed 32-bit integer
62 subtype Nat is Int range 0 .. Int'Last;
63 -- Non-negative Int values
65 subtype Pos is Int range 1 .. Int'Last;
66 -- Positive Int values
68 type Word is mod 2 ** 32;
69 -- Unsigned 32-bit integer
71 type Short is range -32768 .. +32767;
72 for Short'Size use 16;
73 -- 16-bit signed integer
75 type Byte is mod 2 ** 8;
77 -- 8-bit unsigned integer
79 type size_t is mod 2 ** Standard'Address_Size;
80 -- Memory size value, for use in calls to C routines
82 --------------------------------------
83 -- 8-Bit Character and String Types --
84 --------------------------------------
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.
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.
101 subtype Graphic_Character is Character range ' ' .. '~';
102 -- Graphic characters, as defined in ARM
104 subtype Line_Terminator is Character range ASCII.LF .. ASCII.CR;
105 -- Line terminator characters (LF, VT, FF, CR)
107 -- This definition is dubious now that we have two more wide character
108 -- sequences that constitute a line terminator. Every reference to this
109 -- subtype needs checking to make sure the wide character case is handled
110 -- appropriately. ???
112 subtype Upper_Half_Character is
113 Character range Character'Val (16#80#) .. Character'Val (16#FF#);
114 -- Characters with the upper bit set
116 type Character_Ptr is access all Character;
117 type String_Ptr is access all String;
118 -- Standard character and string pointers
120 procedure Free is new Unchecked_Deallocation (String, String_Ptr);
121 -- Procedure for freeing dynamically allocated String values
123 subtype Big_String is String (Positive);
124 type Big_String_Ptr is access all Big_String;
125 for Big_String_Ptr'Storage_Size use 0;
126 -- Virtual type for handling imported big strings
128 function To_Big_String_Ptr is
129 new Unchecked_Conversion (System.Address, Big_String_Ptr);
130 -- Used to obtain Big_String_Ptr values from external addresses
132 subtype Word_Hex_String is String (1 .. 8);
133 -- Type used to represent Word value as 8 hex digits, with lower case
134 -- letters for the alphabetic cases.
136 function Get_Hex_String (W : Word) return Word_Hex_String;
137 -- Convert word value to 8-character hex string
139 -----------------------------------------
140 -- Types Used for Text Buffer Handling --
141 -----------------------------------------
143 -- We can not use type String for text buffers, since we must use the
144 -- standard 32-bit integer as an index value, since we count on all index
145 -- values being the same size.
147 type Text_Ptr is new Int;
148 -- Type used for subscripts in text buffer
150 type Text_Buffer is array (Text_Ptr range <>) of Character;
151 -- Text buffer used to hold source file or library information file
153 type Text_Buffer_Ptr is access all Text_Buffer;
154 -- Text buffers for input files are allocated dynamically and this type
155 -- is used to reference these text buffers.
157 procedure Free is new Unchecked_Deallocation (Text_Buffer, Text_Buffer_Ptr);
158 -- Procedure for freeing dynamically allocated text buffers
160 ------------------------------------------
161 -- Types Used for Source Input Handling --
162 ------------------------------------------
164 type Logical_Line_Number is range 0 .. Int'Last;
165 for Logical_Line_Number'Size use 32;
166 -- Line number type, used for storing logical line numbers (i.e. line
167 -- numbers that include effects of any Source_Reference pragmas in the
168 -- source file). The value zero indicates a line containing a source
171 No_Line_Number : constant Logical_Line_Number := 0;
172 -- Special value used to indicate no line number
174 type Physical_Line_Number is range 1 .. Int'Last;
175 for Physical_Line_Number'Size use 32;
176 -- Line number type, used for storing physical line numbers (i.e. line
177 -- numbers in the physical file being compiled, unaffected by the presence
178 -- of source reference pragmas.
180 type Column_Number is range 0 .. 32767;
181 for Column_Number'Size use 16;
182 -- Column number (assume that 2**15 - 1 is large enough). The range for
183 -- this type is used to compute Hostparm.Max_Line_Length. See also the
184 -- processing for -gnatyM in Stylesw).
186 No_Column_Number : constant Column_Number := 0;
187 -- Special value used to indicate no column number
189 subtype Source_Buffer is Text_Buffer;
190 -- Type used to store text of a source file . The buffer for the main
191 -- source (the source specified on the command line) has a lower bound
192 -- starting at zero. Subsequent subsidiary sources have lower bounds
193 -- which are one greater than the previous upper bound.
195 subtype Big_Source_Buffer is Text_Buffer (0 .. Text_Ptr'Last);
196 -- This is a virtual type used as the designated type of the access type
197 -- Source_Buffer_Ptr, see Osint.Read_Source_File for details.
199 type Source_Buffer_Ptr is access all Big_Source_Buffer;
200 for Source_Buffer_Ptr'Storage_Size use 0;
201 -- Pointer to source buffer. We use virtual origin addressing for source
202 -- buffers, with thin pointers. The pointer points to a virtual instance
203 -- of type Big_Source_Buffer, where the actual type is in fact of type
204 -- Source_Buffer. The address is adjusted so that the virtual origin
205 -- addressing works correctly. See Osint.Read_Source_Buffer for further
208 subtype Source_Ptr is Text_Ptr;
209 -- Type used to represent a source location, which is a subscript of a
210 -- character in the source buffer. As noted above, different source buffers
211 -- have different ranges, so it is possible to tell from a Source_Ptr value
212 -- which source it refers to. Note that negative numbers are allowed to
213 -- accommodate the following special values.
215 No_Location : constant Source_Ptr := -1;
216 -- Value used to indicate no source position set in a node. A test for a
217 -- Source_Ptr value being > No_Location is the approved way to test for a
218 -- standard value that does not include No_Location or any of the following
219 -- special definitions. One important use of No_Location is to label
220 -- generated nodes that we don't want the debugger to see in normal mode
221 -- (very often we conditionalize so that we set No_Location in normal mode
222 -- and the corresponding source line in -gnatD mode).
224 Standard_Location : constant Source_Ptr := -2;
225 -- Used for all nodes in the representation of package Standard other than
226 -- nodes representing the contents of Standard.ASCII. Note that testing for
227 -- a value being <= Standard_Location tests for both Standard_Location and
228 -- for Standard_ASCII_Location.
230 Standard_ASCII_Location : constant Source_Ptr := -3;
231 -- Used for all nodes in the presentation of package Standard.ASCII
233 System_Location : constant Source_Ptr := -4;
234 -- Used to identify locations of pragmas scanned by Targparm, where we know
235 -- the location is in System, but we don't know exactly what line.
237 First_Source_Ptr : constant Source_Ptr := 0;
238 -- Starting source pointer index value for first source program
240 -------------------------------------
241 -- Range Definitions for Tree Data --
242 -------------------------------------
244 -- The tree has fields that can hold any of the following types:
246 -- Pointers to other tree nodes (type Node_Id)
247 -- List pointers (type List_Id)
248 -- Element list pointers (type Elist_Id)
249 -- Names (type Name_Id)
250 -- Strings (type String_Id)
251 -- Universal integers (type Uint)
252 -- Universal reals (type Ureal)
254 -- In most contexts, the strongly typed interface determines which of these
255 -- types is present. However, there are some situations (involving untyped
256 -- traversals of the tree), where it is convenient to be easily able to
257 -- distinguish these values. The underlying representation in all cases is
258 -- an integer type Union_Id, and we ensure that the range of the various
259 -- possible values for each of the above types is disjoint so that this
260 -- distinction is possible.
262 type Union_Id is new Int;
263 -- The type in the tree for a union of possible ID values
265 -- Note: it is also helpful for debugging purposes to make these ranges
266 -- distinct. If a bug leads to misidentification of a value, then it will
267 -- typically result in an out of range value and a Constraint_Error.
269 List_Low_Bound : constant := -100_000_000;
270 -- The List_Id values are subscripts into an array of list headers which
271 -- has List_Low_Bound as its lower bound. This value is chosen so that all
272 -- List_Id values are negative, and the value zero is in the range of both
273 -- List_Id and Node_Id values (see further description below).
275 List_High_Bound : constant := 0;
276 -- Maximum List_Id subscript value. This allows up to 100 million list Id
277 -- values, which is in practice infinite, and there is no need to check the
278 -- range. The range overlaps the node range by one element (with value
279 -- zero), which is used both for the Empty node, and for indicating no
280 -- list. The fact that the same value is used is convenient because it
281 -- means that the default value of Empty applies to both nodes and lists,
282 -- and also is more efficient to test for.
284 Node_Low_Bound : constant := 0;
285 -- The tree Id values start at zero, because we use zero for Empty (to
286 -- allow a zero test for Empty). Actual tree node subscripts start at 0
287 -- since Empty is a legitimate node value.
289 Node_High_Bound : constant := 099_999_999;
290 -- Maximum number of nodes that can be allocated is 100 million, which
291 -- is in practice infinite, and there is no need to check the range.
293 Elist_Low_Bound : constant := 100_000_000;
294 -- The Elist_Id values are subscripts into an array of elist headers which
295 -- has Elist_Low_Bound as its lower bound.
297 Elist_High_Bound : constant := 199_999_999;
298 -- Maximum Elist_Id subscript value. This allows up to 100 million Elists,
299 -- which is in practice infinite and there is no need to check the range.
301 Elmt_Low_Bound : constant := 200_000_000;
302 -- Low bound of element Id values. The use of these values is internal to
303 -- the Elists package, but the definition of the range is included here
304 -- since it must be disjoint from other Id values. The Elmt_Id values are
305 -- subscripts into an array of list elements which has this as lower bound.
307 Elmt_High_Bound : constant := 299_999_999;
308 -- Upper bound of Elmt_Id values. This allows up to 100 million element
309 -- list members, which is in practice infinite (no range check needed).
311 Names_Low_Bound : constant := 300_000_000;
312 -- Low bound for name Id values
314 Names_High_Bound : constant := 399_999_999;
315 -- Maximum number of names that can be allocated is 100 million, which is
316 -- in practice infinite and there is no need to check the range.
318 Strings_Low_Bound : constant := 400_000_000;
319 -- Low bound for string Id values
321 Strings_High_Bound : constant := 499_999_999;
322 -- Maximum number of strings that can be allocated is 100 million, which
323 -- is in practice infinite and there is no need to check the range.
325 Ureal_Low_Bound : constant := 500_000_000;
326 -- Low bound for Ureal values
328 Ureal_High_Bound : constant := 599_999_999;
329 -- Maximum number of Ureal values stored is 100_000_000 which is in
330 -- practice infinite so that no check is required.
332 Uint_Low_Bound : constant := 600_000_000;
333 -- Low bound for Uint values
335 Uint_Table_Start : constant := 2_000_000_000;
336 -- Location where table entries for universal integers start (see
337 -- Uintp spec for details of the representation of Uint values).
339 Uint_High_Bound : constant := 2_099_999_999;
340 -- The range of Uint values is very large, since a substantial part
341 -- of this range is used to store direct values, see Uintp for details.
343 -- The following subtype definitions are used to provide convenient names
344 -- for membership tests on Int values to see what data type range they
345 -- lie in. Such tests appear only in the lowest level packages.
347 subtype List_Range is Union_Id
348 range List_Low_Bound .. List_High_Bound;
350 subtype Node_Range is Union_Id
351 range Node_Low_Bound .. Node_High_Bound;
353 subtype Elist_Range is Union_Id
354 range Elist_Low_Bound .. Elist_High_Bound;
356 subtype Elmt_Range is Union_Id
357 range Elmt_Low_Bound .. Elmt_High_Bound;
359 subtype Names_Range is Union_Id
360 range Names_Low_Bound .. Names_High_Bound;
362 subtype Strings_Range is Union_Id
363 range Strings_Low_Bound .. Strings_High_Bound;
365 subtype Uint_Range is Union_Id
366 range Uint_Low_Bound .. Uint_High_Bound;
368 subtype Ureal_Range is Union_Id
369 range Ureal_Low_Bound .. Ureal_High_Bound;
371 -----------------------------
372 -- Types for Atree Package --
373 -----------------------------
375 -- Node_Id values are used to identify nodes in the tree. They are
376 -- subscripts into the Nodes table declared in package Atree. Note that
377 -- the special values Empty and Error are subscripts into this table.
378 -- See package Atree for further details.
380 type Node_Id is range Node_Low_Bound .. Node_High_Bound;
381 -- Type used to identify nodes in the tree
383 subtype Entity_Id is Node_Id;
384 -- A synonym for node types, used in the Einfo package to refer to nodes
385 -- that are entities (i.e. nodes with an Nkind of N_Defining_xxx). All such
386 -- nodes are extended nodes and these are the only extended nodes, so that
387 -- in practice entity and extended nodes are synonymous.
389 subtype Node_Or_Entity_Id is Node_Id;
390 -- A synonym for node types, used in cases where a given value may be used
391 -- to represent either a node or an entity. We like to minimize such uses
392 -- for obvious reasons of logical type consistency, but where such uses
393 -- occur, they should be documented by use of this type.
395 Empty : constant Node_Id := Node_Low_Bound;
396 -- Used to indicate null node. A node is actually allocated with this
397 -- Id value, so that Nkind (Empty) = N_Empty. Note that Node_Low_Bound
398 -- is zero, so Empty = No_List = zero.
400 Empty_List_Or_Node : constant := 0;
401 -- This constant is used in situations (e.g. initializing empty fields)
402 -- where the value set will be used to represent either an empty node or
403 -- a non-existent list, depending on the context.
405 Error : constant Node_Id := Node_Low_Bound + 1;
406 -- Used to indicate an error in the source program. A node is actually
407 -- allocated with this Id value, so that Nkind (Error) = N_Error.
409 Empty_Or_Error : constant Node_Id := Error;
410 -- Since Empty and Error are the first two Node_Id values, the test for
411 -- N <= Empty_Or_Error tests to see if N is Empty or Error. This definition
412 -- provides convenient self-documentation for such tests.
414 First_Node_Id : constant Node_Id := Node_Low_Bound;
415 -- Subscript of first allocated node. Note that Empty and Error are both
416 -- allocated nodes, whose Nkind fields can be accessed without error.
418 ------------------------------
419 -- Types for Nlists Package --
420 ------------------------------
422 -- List_Id values are used to identify node lists stored in the tree, so
423 -- that each node can be on at most one such list (see package Nlists for
424 -- further details). Note that the special value Error_List is a subscript
425 -- in this table, but the value No_List is *not* a valid subscript, and any
426 -- attempt to apply list operations to No_List will cause a (detected)
429 type List_Id is range List_Low_Bound .. List_High_Bound;
430 -- Type used to identify a node list
432 No_List : constant List_Id := List_High_Bound;
433 -- Used to indicate absence of a list. Note that the value is zero, which
434 -- is the same as Empty, which is helpful in initializing nodes where a
435 -- value of zero can represent either an empty node or an empty list.
437 Error_List : constant List_Id := List_Low_Bound;
438 -- Used to indicate that there was an error in the source program in a
439 -- context which would normally require a list. This node appears to be
440 -- an empty list to the list operations (a null list is actually allocated
441 -- which has this Id value).
443 First_List_Id : constant List_Id := Error_List;
444 -- Subscript of first allocated list header
446 ------------------------------
447 -- Types for Elists Package --
448 ------------------------------
450 -- Element list Id values are used to identify element lists stored outside
451 -- of the tree, allowing nodes to be members of more than one such list
452 -- (see package Elists for further details).
454 type Elist_Id is range Elist_Low_Bound .. Elist_High_Bound;
455 -- Type used to identify an element list (Elist header table subscript)
457 No_Elist : constant Elist_Id := Elist_Low_Bound;
458 -- Used to indicate absence of an element list. Note that this is not an
459 -- actual Elist header, so element list operations on this value are not
462 First_Elist_Id : constant Elist_Id := No_Elist + 1;
463 -- Subscript of first allocated Elist header
465 -- Element Id values are used to identify individual elements of an element
466 -- list (see package Elists for further details).
468 type Elmt_Id is range Elmt_Low_Bound .. Elmt_High_Bound;
469 -- Type used to identify an element list
471 No_Elmt : constant Elmt_Id := Elmt_Low_Bound;
472 -- Used to represent empty element
474 First_Elmt_Id : constant Elmt_Id := No_Elmt + 1;
475 -- Subscript of first allocated Elmt table entry
477 -------------------------------
478 -- Types for Stringt Package --
479 -------------------------------
481 -- String_Id values are used to identify entries in the strings table. They
482 -- are subscripts into the Strings table defined in package Stringt.
484 -- Note that with only a few exceptions, which are clearly documented, the
485 -- type String_Id should be regarded as a private type. In particular it is
486 -- never appropriate to perform arithmetic operations using this type.
487 -- Doesn't this also apply to all other *_Id types???
489 type String_Id is range Strings_Low_Bound .. Strings_High_Bound;
490 -- Type used to identify entries in the strings table
492 No_String : constant String_Id := Strings_Low_Bound;
493 -- Used to indicate missing string Id. Note that the value zero is used
494 -- to indicate a missing data value for all the Int types in this section.
496 First_String_Id : constant String_Id := No_String + 1;
497 -- First subscript allocated in string table
499 -------------------------
500 -- Character Code Type --
501 -------------------------
503 -- The type Char is used for character data internally in the compiler, but
504 -- character codes in the source are represented by the Char_Code type.
505 -- Each character literal in the source is interpreted as being one of the
506 -- 16#7FFF_FFFF# possible Wide_Wide_Character codes, and a unique Integer
507 -- value is assigned, corresponding to the UTF-32 value, which also
508 -- corresponds to the Pos value in the Wide_Wide_Character type, and also
509 -- corresponds to the Pos value in the Wide_Character and Character types
510 -- for values that are in appropriate range. String literals are similarly
511 -- interpreted as a sequence of such codes.
513 type Char_Code_Base is mod 2 ** 32;
514 for Char_Code_Base'Size use 32;
516 subtype Char_Code is Char_Code_Base range 0 .. 16#7FFF_FFFF#;
517 for Char_Code'Value_Size use 32;
518 for Char_Code'Object_Size use 32;
520 function Get_Char_Code (C : Character) return Char_Code;
521 pragma Inline (Get_Char_Code);
522 -- Function to obtain internal character code from source character. For
523 -- the moment, the internal character code is simply the Pos value of the
524 -- input source character, but we provide this interface for possible
525 -- later support of alternative character sets.
527 function In_Character_Range (C : Char_Code) return Boolean;
528 pragma Inline (In_Character_Range);
529 -- Determines if the given character code is in range of type Character,
530 -- and if so, returns True. If not, returns False.
532 function In_Wide_Character_Range (C : Char_Code) return Boolean;
533 pragma Inline (In_Wide_Character_Range);
534 -- Determines if the given character code is in range of the type
535 -- Wide_Character, and if so, returns True. If not, returns False.
537 function Get_Character (C : Char_Code) return Character;
538 pragma Inline (Get_Character);
539 -- For a character C that is in Character range (see above function), this
540 -- function returns the corresponding Character value. It is an error to
541 -- call Get_Character if C is not in Character range.
543 function Get_Wide_Character (C : Char_Code) return Wide_Character;
544 -- For a character C that is in Wide_Character range (see above function),
545 -- this function returns the corresponding Wide_Character value. It is an
546 -- error to call Get_Wide_Character if C is not in Wide_Character range.
548 ---------------------------------------
549 -- Types used for Library Management --
550 ---------------------------------------
552 type Unit_Number_Type is new Int;
553 -- Unit number. The main source is unit 0, and subsidiary sources have
554 -- non-zero numbers starting with 1. Unit numbers are used to index the
555 -- Units table in package Lib.
557 Main_Unit : constant Unit_Number_Type := 0;
558 -- Unit number value for main unit
560 No_Unit : constant Unit_Number_Type := -1;
561 -- Special value used to signal no unit
563 type Source_File_Index is new Int range -1 .. Int'Last;
564 -- Type used to index the source file table (see package Sinput)
566 Internal_Source_File : constant Source_File_Index :=
567 Source_File_Index'First;
568 -- Value used to indicate the buffer for the source-code-like strings
569 -- internally created withing the compiler (see package Sinput)
571 No_Source_File : constant Source_File_Index := 0;
572 -- Value used to indicate no source file present
574 -----------------------------------
575 -- Representation of Time Stamps --
576 -----------------------------------
578 -- All compiled units are marked with a time stamp which is derived from
579 -- the source file (we assume that the host system has the concept of a
580 -- file time stamp which is modified when a file is modified). These
581 -- time stamps are used to ensure consistency of the set of units that
582 -- constitutes a library. Time stamps are 12 character strings with
583 -- with the following format:
588 -- MM month (2 digits 01-12)
589 -- DD day (2 digits 01-31)
590 -- HH hour (2 digits 00-23)
591 -- MM minutes (2 digits 00-59)
592 -- SS seconds (2 digits 00-59)
594 -- In the case of Unix systems (and other systems which keep the time in
595 -- GMT), the time stamp is the GMT time of the file, not the local time.
596 -- This solves problems in using libraries across networks with clients
597 -- spread across multiple time-zones.
599 Time_Stamp_Length : constant := 14;
600 -- Length of time stamp value
602 subtype Time_Stamp_Index is Natural range 1 .. Time_Stamp_Length;
603 type Time_Stamp_Type is new String (Time_Stamp_Index);
604 -- Type used to represent time stamp
606 Empty_Time_Stamp : constant Time_Stamp_Type := (others => ' ');
607 -- Value representing an empty or missing time stamp. Looks less than any
608 -- real time stamp if two time stamps are compared. Note that although this
609 -- is not private, clients should not rely on the exact way in which this
610 -- string is represented, and instead should use the subprograms below.
612 Dummy_Time_Stamp : constant Time_Stamp_Type := (others => '0');
613 -- This is used for dummy time stamp values used in the D lines for
614 -- non-existent files, and is intended to be an impossible value.
616 function "=" (Left, Right : Time_Stamp_Type) return Boolean;
617 function "<=" (Left, Right : Time_Stamp_Type) return Boolean;
618 function ">=" (Left, Right : Time_Stamp_Type) return Boolean;
619 function "<" (Left, Right : Time_Stamp_Type) return Boolean;
620 function ">" (Left, Right : Time_Stamp_Type) return Boolean;
621 -- Comparison functions on time stamps. Note that two time stamps are
622 -- defined as being equal if they have the same day/month/year and the
623 -- hour/minutes/seconds values are within 2 seconds of one another. This
624 -- deals with rounding effects in library file time stamps caused by
625 -- copying operations during installation. We have particularly noticed
626 -- that WinNT seems susceptible to such changes.
628 -- Note : the Empty_Time_Stamp value looks equal to itself, and less than
629 -- any non-empty time stamp value.
631 procedure Split_Time_Stamp
632 (TS : Time_Stamp_Type;
639 -- Given a time stamp, decompose it into its components
641 procedure Make_Time_Stamp
648 TS : out Time_Stamp_Type);
649 -- Given the components of a time stamp, initialize the value
651 -----------------------------------------------
652 -- Types used for Pragma Suppress Management --
653 -----------------------------------------------
655 type Check_Id is new Nat;
656 -- Type used to represent a check id
658 No_Check_Id : constant := 0;
659 -- Check_Id value used to indicate no check
661 Access_Check : constant := 1;
662 Accessibility_Check : constant := 2;
663 Alignment_Check : constant := 3;
664 Discriminant_Check : constant := 4;
665 Division_Check : constant := 5;
666 Elaboration_Check : constant := 6;
667 Index_Check : constant := 7;
668 Length_Check : constant := 8;
669 Overflow_Check : constant := 9;
670 Range_Check : constant := 10;
671 Storage_Check : constant := 11;
672 Tag_Check : constant := 12;
673 Validity_Check : constant := 13;
674 -- Values used to represent individual predefined checks
676 All_Checks : constant := 14;
677 -- Value used to represent All_Checks value
679 subtype Predefined_Check_Id is Check_Id range 1 .. All_Checks;
680 -- Subtype for predefined checks, including All_Checks
682 -- The following array contains an entry for each recognized check name
683 -- for pragma Suppress. It is used to represent current settings of scope
684 -- based suppress actions from pragma Suppress or command line settings.
686 -- Note: when Suppress_Array (All_Checks) is True, then generally all other
687 -- specific check entries are set True, except for the Elaboration_Check
688 -- entry which is set only if an explicit Suppress for this check is given.
689 -- The reason for this non-uniformity is that we do not want All_Checks to
690 -- suppress elaboration checking when using the static elaboration model.
691 -- We recognize only an explicit suppress of Elaboration_Check as a signal
692 -- that the static elaboration checking should skip a compile time check.
694 type Suppress_Array is array (Predefined_Check_Id) of Boolean;
695 pragma Pack (Suppress_Array);
697 -- To add a new check type to GNAT, the following steps are required:
699 -- 1. Add an entry to Snames spec and body for the new name
700 -- 2. Add an entry to the definition of Check_Id above
701 -- 3. Add a new function to Checks to handle the new check test
702 -- 4. Add a new Do_xxx_Check flag to Sinfo (if required)
703 -- 5. Add appropriate checks for the new test
705 -----------------------------------
706 -- Global Exception Declarations --
707 -----------------------------------
709 -- This section contains declarations of exceptions that are used
710 -- throughout the compiler or in other GNAT tools.
712 Unrecoverable_Error : exception;
713 -- This exception is raised to immediately terminate the compilation of the
714 -- current source program. Used in situations where things are bad enough
715 -- that it doesn't seem worth continuing (e.g. max errors reached, or a
716 -- required file is not found). Also raised when the compiler finds itself
717 -- in trouble after an error (see Comperr).
719 Terminate_Program : exception;
720 -- This exception is raised to immediately terminate the tool being
721 -- executed. Each tool where this exception may be raised must have a
722 -- single exception handler that contains only a null statement and that is
723 -- the last statement of the program. If needed, procedure Set_Exit_Status
724 -- is called with the appropriate exit status before raising
725 -- Terminate_Program.
727 ---------------------------------
728 -- Parameter Mechanism Control --
729 ---------------------------------
731 -- Function and parameter entities have a field that records the passing
732 -- mechanism. See specification of Sem_Mech for full details. The following
733 -- subtype is used to represent values of this type:
735 subtype Mechanism_Type is Int range -18 .. Int'Last;
736 -- Type used to represent a mechanism value. This is a subtype rather than
737 -- a type to avoid some annoying processing problems with certain routines
738 -- in Einfo (processing them to create the corresponding C).
740 ------------------------------
741 -- Run-Time Exception Codes --
742 ------------------------------
744 -- When the code generator generates a run-time exception, it provides a
745 -- reason code which is one of the following. This reason code is used to
746 -- select the appropriate run-time routine to be called, determining both
747 -- the exception to be raised, and the message text to be added.
749 -- The prefix CE/PE/SE indicates the exception to be raised
750 -- CE = Constraint_Error
751 -- PE = Program_Error
752 -- SE = Storage_Error
754 -- The remaining part of the name indicates the message text to be added,
755 -- where all letters are lower case, and underscores are converted to
756 -- spaces (for example CE_Invalid_Data adds the text "invalid data").
758 -- To add a new code, you need to do the following:
760 -- 1. Modify the type and subtype declarations below appropriately,
761 -- keeping things in alphabetical order.
763 -- 2. Modify the corresponding definitions in types.h, including the
764 -- definition of last_reason_code.
766 -- 3. Add a new routine in Ada.Exceptions with the appropriate call and
767 -- static string constant. Note that there is more than one version
768 -- of a-except.adb which must be modified.
770 type RT_Exception_Code is
771 (CE_Access_Check_Failed, -- 00
772 CE_Access_Parameter_Is_Null, -- 01
773 CE_Discriminant_Check_Failed, -- 02
774 CE_Divide_By_Zero, -- 03
775 CE_Explicit_Raise, -- 04
776 CE_Index_Check_Failed, -- 05
777 CE_Invalid_Data, -- 06
778 CE_Length_Check_Failed, -- 07
779 CE_Null_Exception_Id, -- 08
780 CE_Null_Not_Allowed, -- 09
781 CE_Overflow_Check_Failed, -- 10
782 CE_Partition_Check_Failed, -- 11
783 CE_Range_Check_Failed, -- 12
784 CE_Tag_Check_Failed, -- 13
786 PE_Access_Before_Elaboration, -- 14
787 PE_Accessibility_Check_Failed, -- 15
788 PE_Address_Of_Intrinsic, -- 16
789 PE_All_Guards_Closed, -- 17
790 PE_Current_Task_In_Entry_Body, -- 18
791 PE_Duplicated_Entry_Address, -- 19
792 PE_Explicit_Raise, -- 20
793 PE_Finalize_Raised_Exception, -- 21
794 PE_Implicit_Return, -- 22
795 PE_Misaligned_Address_Value, -- 23
796 PE_Missing_Return, -- 24
797 PE_Overlaid_Controlled_Object, -- 25
798 PE_Potentially_Blocking_Operation, -- 26
799 PE_Stubbed_Subprogram_Called, -- 27
800 PE_Unchecked_Union_Restriction, -- 28
801 PE_Non_Transportable_Actual, -- 29
803 SE_Empty_Storage_Pool, -- 30
804 SE_Explicit_Raise, -- 31
805 SE_Infinite_Recursion, -- 32
806 SE_Object_Too_Large); -- 33
808 subtype RT_CE_Exceptions is RT_Exception_Code range
809 CE_Access_Check_Failed ..
812 subtype RT_PE_Exceptions is RT_Exception_Code range
813 PE_Access_Before_Elaboration ..
814 PE_Non_Transportable_Actual;
816 subtype RT_SE_Exceptions is RT_Exception_Code range
817 SE_Empty_Storage_Pool ..
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