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[committed] [v2] More logical op simplifications in simplify-rtx.cc
[official-gcc.git] / gcc / ada / set_targ.adb
blob0d4714bf99b88ee11be04e5c704fbf0a046fe6f4
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S E T _ T A R G --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2013-2024, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 with Debug; use Debug;
27 with Get_Targ; use Get_Targ;
28 with Opt; use Opt;
29 with Output; use Output;
30
31 with System; use System;
32 with System.OS_Lib; use System.OS_Lib;
33
34 with Ada.Unchecked_Conversion;
35
36 package body Set_Targ is
37
38 --------------------------------------------------------
39 -- Data Used to Read/Write Target Dependent Info File --
40 --------------------------------------------------------
41
42 -- Table of string names written to file
43
44 subtype Str is String;
45
46 S_Bits_BE : constant Str := "Bits_BE";
47 S_Bits_Per_Unit : constant Str := "Bits_Per_Unit";
48 S_Bits_Per_Word : constant Str := "Bits_Per_Word";
49 S_Bytes_BE : constant Str := "Bytes_BE";
50 S_Char_Size : constant Str := "Char_Size";
51 S_Double_Float_Alignment : constant Str := "Double_Float_Alignment";
52 S_Double_Scalar_Alignment : constant Str := "Double_Scalar_Alignment";
53 S_Double_Size : constant Str := "Double_Size";
54 S_Float_Size : constant Str := "Float_Size";
55 S_Float_Words_BE : constant Str := "Float_Words_BE";
56 S_Int_Size : constant Str := "Int_Size";
57 S_Long_Double_Size : constant Str := "Long_Double_Size";
58 S_Long_Long_Long_Size : constant Str := "Long_Long_Long_Size";
59 S_Long_Long_Size : constant Str := "Long_Long_Size";
60 S_Long_Size : constant Str := "Long_Size";
61 S_Maximum_Alignment : constant Str := "Maximum_Alignment";
62 S_Max_Unaligned_Field : constant Str := "Max_Unaligned_Field";
63 S_Pointer_Size : constant Str := "Pointer_Size";
64 S_Short_Enums : constant Str := "Short_Enums";
65 S_Short_Size : constant Str := "Short_Size";
66 S_Strict_Alignment : constant Str := "Strict_Alignment";
67 S_System_Allocator_Alignment : constant Str := "System_Allocator_Alignment";
68 S_Wchar_T_Size : constant Str := "Wchar_T_Size";
69 S_Words_BE : constant Str := "Words_BE";
70
71 -- Table of names
72
73 type AStr is access all String;
74
75 DTN : constant array (Nat range <>) of AStr := (
76 S_Bits_BE 'Unrestricted_Access,
77 S_Bits_Per_Unit 'Unrestricted_Access,
78 S_Bits_Per_Word 'Unrestricted_Access,
79 S_Bytes_BE 'Unrestricted_Access,
80 S_Char_Size 'Unrestricted_Access,
81 S_Double_Float_Alignment 'Unrestricted_Access,
82 S_Double_Scalar_Alignment 'Unrestricted_Access,
83 S_Double_Size 'Unrestricted_Access,
84 S_Float_Size 'Unrestricted_Access,
85 S_Float_Words_BE 'Unrestricted_Access,
86 S_Int_Size 'Unrestricted_Access,
87 S_Long_Double_Size 'Unrestricted_Access,
88 S_Long_Long_Long_Size 'Unrestricted_Access,
89 S_Long_Long_Size 'Unrestricted_Access,
90 S_Long_Size 'Unrestricted_Access,
91 S_Maximum_Alignment 'Unrestricted_Access,
92 S_Max_Unaligned_Field 'Unrestricted_Access,
93 S_Pointer_Size 'Unrestricted_Access,
94 S_Short_Enums 'Unrestricted_Access,
95 S_Short_Size 'Unrestricted_Access,
96 S_Strict_Alignment 'Unrestricted_Access,
97 S_System_Allocator_Alignment 'Unrestricted_Access,
98 S_Wchar_T_Size 'Unrestricted_Access,
99 S_Words_BE 'Unrestricted_Access);
100
101 -- Table of corresponding value pointers
102
103 DTV : constant array (Nat range <>) of System.Address := (
104 Bits_BE 'Address,
105 Bits_Per_Unit 'Address,
106 Bits_Per_Word 'Address,
107 Bytes_BE 'Address,
108 Char_Size 'Address,
109 Double_Float_Alignment 'Address,
110 Double_Scalar_Alignment 'Address,
111 Double_Size 'Address,
112 Float_Size 'Address,
113 Float_Words_BE 'Address,
114 Int_Size 'Address,
115 Long_Double_Size 'Address,
116 Long_Long_Long_Size 'Address,
117 Long_Long_Size 'Address,
118 Long_Size 'Address,
119 Maximum_Alignment 'Address,
120 Max_Unaligned_Field 'Address,
121 Pointer_Size 'Address,
122 Short_Enums 'Address,
123 Short_Size 'Address,
124 Strict_Alignment 'Address,
125 System_Allocator_Alignment 'Address,
126 Wchar_T_Size 'Address,
127 Words_BE 'Address);
128
129 DTR : array (Nat range DTV'Range) of Boolean := (others => False);
130 -- Table of flags used to validate that all values are present in file
131
132 -----------------------
133 -- Local Subprograms --
134 -----------------------
135
136 procedure Read_Target_Dependent_Values (File_Name : String);
137 -- Read target dependent values from File_Name, and set the target
138 -- dependent values (global variables) declared in this package.
139
140 procedure Fail (E : String);
141 pragma No_Return (Fail);
142 -- Terminate program with fatal error message passed as parameter
143
144 procedure Register_Float_Type
145 (Name : C_String;
146 Digs : Natural;
147 Complex : Boolean;
148 Count : Natural;
149 Float_Rep : Float_Rep_Kind;
150 Precision : Positive;
151 Size : Positive;
152 Alignment : Natural);
153 pragma Convention (C, Register_Float_Type);
154 -- Call back to allow the back end to register available types. This call
155 -- back makes entries in the FPT_Mode_Table for any floating point types
156 -- reported by the back end. Name is the name of the type as a normal
157 -- format Null-terminated string. Digs is the number of digits, where 0
158 -- means it is not a fpt type (ignored during registration). Complex is
159 -- non-zero if the type has real and imaginary parts (also ignored during
160 -- registration). Count is the number of elements in a vector type (zero =
161 -- not a vector, registration ignores vectors). Float_Rep shows the kind of
162 -- floating-point type, and Precision, Size and Alignment are the precision
163 -- size and alignment in bits.
164 --
165 -- The only types that are actually registered have Digs non-zero, Complex
166 -- zero (false), and Count zero (not a vector). The Long_Double_Index
167 -- variable below is updated to indicate the index at which a "long double"
168 -- type can be found if it gets registered at all.
169
170 Long_Double_Index : Integer := -1;
171 -- Once all the floating point types have been registered, the index in
172 -- FPT_Mode_Table at which "long double" can be found, if anywhere. A
173 -- negative value means that no "long double" has been registered. This
174 -- is useful to know whether we have a "long double" available at all and
175 -- get at it's characteristics without having to search the FPT_Mode_Table
176 -- when we need to decide which C type should be used as the basis for
177 -- Long_Long_Float in Ada.
178
179 function FPT_Mode_Index_For (Name : String) return Natural;
180 -- Return the index in FPT_Mode_Table that designates the entry
181 -- corresponding to the C type named Name. Raise Program_Error if
182 -- there is no such entry.
183
184 function FPT_Mode_Index_For (T : S_Float_Types) return Natural;
185 -- Return the index in FPT_Mode_Table that designates the entry for
186 -- a back-end type suitable as a basis to construct the standard Ada
187 -- floating point type identified by T.
188
189 ----------------
190 -- C_Type_For --
191 ----------------
192
193 function C_Type_For (T : S_Float_Types) return String is
194
195 -- ??? For now, we don't have a good way to tell the widest float
196 -- type with hardware support. Basically, GCC knows the size of that
197 -- type, but on x86-64 there often are two or three 128-bit types,
198 -- one double extended that has 18 decimal digits, a 128-bit quad
199 -- precision type with 33 digits and possibly a 128-bit decimal float
200 -- type with 34 digits. As a workaround, we define Long_Long_Float as
201 -- C's "long double" if that type exists and has at most 18 digits,
202 -- or otherwise the same as Long_Float.
203
204 Max_HW_Digs : constant := 18;
205 -- Maximum hardware digits supported
206
207 begin
208 case T is
209 when S_Float
210 | S_Short_Float
211 =>
212 return "float";
213
214 when S_Long_Float =>
215 return "double";
216
217 when S_Long_Long_Float =>
218 if Long_Double_Index >= 0
219 and then FPT_Mode_Table (Long_Double_Index).DIGS <= Max_HW_Digs
220 then
221 return "long double";
222 else
223 return "double";
224 end if;
225 end case;
226 end C_Type_For;
227
228 ----------
229 -- Fail --
230 ----------
231
232 procedure Fail (E : String) is
233 E_Fatal : constant := 4;
234 -- Code for fatal error
235
236 begin
237 Write_Str (E);
238 Write_Eol;
239 OS_Exit (E_Fatal);
240 end Fail;
241
242 ------------------------
243 -- FPT_Mode_Index_For --
244 ------------------------
245
246 function FPT_Mode_Index_For (Name : String) return Natural is
247 begin
248 for J in FPT_Mode_Table'First .. Num_FPT_Modes loop
249 if FPT_Mode_Table (J).NAME.all = Name then
250 return J;
251 end if;
252 end loop;
253
254 raise Program_Error;
255 end FPT_Mode_Index_For;
256
257 function FPT_Mode_Index_For (T : S_Float_Types) return Natural is
258 begin
259 return FPT_Mode_Index_For (C_Type_For (T));
260 end FPT_Mode_Index_For;
261
262 -------------------------
263 -- Register_Float_Type --
264 -------------------------
265
266 procedure Register_Float_Type
267 (Name : C_String;
268 Digs : Natural;
269 Complex : Boolean;
270 Count : Natural;
271 Float_Rep : Float_Rep_Kind;
272 Precision : Positive;
273 Size : Positive;
274 Alignment : Natural)
275 is
276 T : String (1 .. Name'Length);
277 Last : Natural := 0;
278
279 procedure Dump;
280 -- Dump information given by the back end for the type to register
281
282 ----------
283 -- Dump --
284 ----------
285
286 procedure Dump is
287 begin
288 Write_Str ("type " & T (1 .. Last) & " is ");
289
290 if Count > 0 then
291 Write_Str ("array (1 .. ");
292 Write_Int (Int (Count));
293
294 if Complex then
295 Write_Str (", 1 .. 2");
296 end if;
297
298 Write_Str (") of ");
299
300 elsif Complex then
301 Write_Str ("array (1 .. 2) of ");
302 end if;
303
304 if Digs > 0 then
305 Write_Str ("digits ");
306 Write_Int (Int (Digs));
307 Write_Line (";");
308
309 Write_Str ("pragma Float_Representation (");
310
311 case Float_Rep is
312 when IEEE_Binary => Write_Str ("IEEE");
313 end case;
314
315 Write_Line (", " & T (1 .. Last) & ");");
316
317 else
318 Write_Str ("mod 2**");
319 Write_Int (Int (Precision / Positive'Max (1, Count)));
320 Write_Line (";");
321 end if;
322
323 if Precision = Size then
324 Write_Str ("for " & T (1 .. Last) & "'Size use ");
325 Write_Int (Int (Size));
326 Write_Line (";");
327
328 else
329 Write_Str ("for " & T (1 .. Last) & "'Value_Size use ");
330 Write_Int (Int (Precision));
331 Write_Line (";");
332
333 Write_Str ("for " & T (1 .. Last) & "'Object_Size use ");
334 Write_Int (Int (Size));
335 Write_Line (";");
336 end if;
337
338 Write_Str ("for " & T (1 .. Last) & "'Alignment use ");
339 Write_Int (Int (Alignment / 8));
340 Write_Line (";");
341 Write_Eol;
342 end Dump;
343
344 -- Start of processing for Register_Float_Type
345
346 begin
347 -- Acquire name
348
349 for J in T'Range loop
350 T (J) := Name (Name'First + J - 1);
351
352 if T (J) = ASCII.NUL then
353 Last := J - 1;
354 exit;
355 end if;
356 end loop;
357
358 -- Dump info if debug flag set
359
360 if Debug_Flag_Dot_B then
361 Dump;
362 end if;
363
364 -- Acquire entry if non-vector non-complex fpt type (digits non-zero)
365
366 if Digs > 0 and then not Complex and then Count = 0 then
367
368 declare
369 This_Name : constant String := T (1 .. Last);
370 begin
371 Num_FPT_Modes := Num_FPT_Modes + 1;
372 FPT_Mode_Table (Num_FPT_Modes) :=
373 (NAME => new String'(This_Name),
374 DIGS => Digs,
375 FLOAT_REP => Float_Rep,
376 PRECISION => Precision,
377 SIZE => Size,
378 ALIGNMENT => Alignment);
379
380 if Long_Double_Index < 0 and then This_Name = "long double" then
381 Long_Double_Index := Num_FPT_Modes;
382 end if;
383 end;
384 end if;
385 end Register_Float_Type;
386
387 -----------------------------------
388 -- Write_Target_Dependent_Values --
389 -----------------------------------
390
391 -- We do this at the System.Os_Lib level, since we have to do the read at
392 -- that level anyway, so it is easier and more consistent to follow the
393 -- same path for the write.
394
395 procedure Write_Target_Dependent_Values is
396 Fdesc : File_Descriptor;
397 OK : Boolean;
398
399 Buffer : String (1 .. 80);
400 Buflen : Natural;
401 -- Buffer used to build line one of file
402
403 type ANat is access all Natural;
404 -- Pointer to Nat or Pos value (it is harmless to treat Pos values and
405 -- Nat values as Natural via Unchecked_Conversion).
406
407 function To_ANat is new Ada.Unchecked_Conversion (Address, ANat);
408
409 procedure AddC (C : Character);
410 -- Add one character to buffer
411
412 procedure AddN (N : Natural);
413 -- Add representation of integer N to Buffer, updating Buflen. N
414 -- must be less than 1000, and output is 3 characters with leading
415 -- spaces as needed.
416
417 procedure Write_Line;
418 -- Output contents of Buffer (1 .. Buflen) followed by a New_Line,
419 -- and set Buflen back to zero, ready to write next line.
420
421 ----------
422 -- AddC --
423 ----------
424
425 procedure AddC (C : Character) is
426 begin
427 Buflen := Buflen + 1;
428 Buffer (Buflen) := C;
429 end AddC;
430
431 ----------
432 -- AddN --
433 ----------
434
435 procedure AddN (N : Natural) is
436 begin
437 if N > 999 then
438 raise Program_Error;
439 end if;
440
441 if N > 99 then
442 AddC (Character'Val (48 + N / 100));
443 else
444 AddC (' ');
445 end if;
446
447 if N > 9 then
448 AddC (Character'Val (48 + N / 10 mod 10));
449 else
450 AddC (' ');
451 end if;
452
453 AddC (Character'Val (48 + N mod 10));
454 end AddN;
455
456 ----------------
457 -- Write_Line --
458 ----------------
459
460 procedure Write_Line is
461 begin
462 AddC (ASCII.LF);
463
464 if Buflen /= Write (Fdesc, Buffer'Address, Buflen) then
465 Delete_File (Target_Dependent_Info_Write_Name.all, OK);
466 Fail ("disk full writing file "
467 & Target_Dependent_Info_Write_Name.all);
468 end if;
469
470 Buflen := 0;
471 end Write_Line;
472
473 -- Start of processing for Write_Target_Dependent_Values
474
475 begin
476 Fdesc :=
477 Create_File (Target_Dependent_Info_Write_Name.all, Text);
478
479 if Fdesc = Invalid_FD then
480 Fail ("cannot create file " & Target_Dependent_Info_Write_Name.all);
481 end if;
482
483 -- Loop through values
484
485 for J in DTN'Range loop
486
487 -- Output name
488
489 Buflen := DTN (J)'Length;
490 Buffer (1 .. Buflen) := DTN (J).all;
491
492 -- Line up values
493
494 while Buflen < 26 loop
495 AddC (' ');
496 end loop;
497
498 AddC (' ');
499 AddC (' ');
500
501 -- Output value and write line
502
503 AddN (To_ANat (DTV (J)).all);
504 Write_Line;
505 end loop;
506
507 -- Blank line to separate sections
508
509 Write_Line;
510
511 -- Write lines for registered FPT types
512
513 for J in 1 .. Num_FPT_Modes loop
514 declare
515 E : FPT_Mode_Entry renames FPT_Mode_Table (J);
516 begin
517 Buflen := E.NAME'Last;
518 Buffer (1 .. Buflen) := E.NAME.all;
519
520 -- Pad out to line up values
521
522 while Buflen < 11 loop
523 AddC (' ');
524 end loop;
525
526 AddC (' ');
527 AddC (' ');
528
529 AddN (E.DIGS);
530 AddC (' ');
531 AddC (' ');
532
533 case E.FLOAT_REP is
534 when IEEE_Binary => AddC ('I');
535 end case;
536
537 AddC (' ');
538
539 AddN (E.PRECISION);
540 AddC (' ');
541
542 AddN (E.ALIGNMENT);
543 Write_Line;
544 end;
545 end loop;
546
547 -- Close file
548
549 Close (Fdesc, OK);
550
551 if not OK then
552 Fail ("disk full writing file "
553 & Target_Dependent_Info_Write_Name.all);
554 end if;
555 end Write_Target_Dependent_Values;
556
557 ----------------------------------
558 -- Read_Target_Dependent_Values --
559 ----------------------------------
560
561 procedure Read_Target_Dependent_Values (File_Name : String) is
562 File_Desc : File_Descriptor;
563 N : Natural;
564
565 type ANat is access all Natural;
566 -- Pointer to Nat or Pos value (it is harmless to treat Pos values
567 -- as Nat via Unchecked_Conversion).
568
569 function To_ANat is new Ada.Unchecked_Conversion (Address, ANat);
570
571 VP : ANat;
572
573 Buffer : String (1 .. 2000);
574 Buflen : Natural;
575 -- File information and length (2000 easily enough)
576
577 Nam_Buf : String (1 .. 40);
578 Nam_Len : Natural;
579
580 procedure Check_Spaces;
581 -- Checks that we have one or more spaces and skips them
582
583 procedure FailN (S : String);
584 pragma No_Return (FailN);
585 -- Calls Fail adding " name in file xxx", where name is the currently
586 -- gathered name in Nam_Buf, surrounded by quotes, and xxx is the
587 -- name of the file.
588
589 procedure Get_Name;
590 -- Scan out name, leaving it in Nam_Buf with Nam_Len set. Calls
591 -- Skip_Spaces to skip any following spaces. Note that the name is
592 -- terminated by a sequence of at least two spaces.
593
594 function Get_Nat return Natural;
595 -- N on entry points to decimal integer, scan out decimal integer
596 -- and return it, leaving N pointing to following space or LF.
597
598 procedure Skip_Spaces;
599 -- Skip past spaces
600
601 ------------------
602 -- Check_Spaces --
603 ------------------
604
605 procedure Check_Spaces is
606 begin
607 if N > Buflen or else Buffer (N) /= ' ' then
608 FailN ("missing space for");
609 end if;
610
611 Skip_Spaces;
612 return;
613 end Check_Spaces;
614
615 -----------
616 -- FailN --
617 -----------
618
619 procedure FailN (S : String) is
620 begin
621 Fail (S & " """ & Nam_Buf (1 .. Nam_Len) & """ in file "
622 & File_Name);
623 end FailN;
624
625 --------------
626 -- Get_Name --
627 --------------
628
629 procedure Get_Name is
630 begin
631 Nam_Len := 0;
632
633 -- Scan out name and put it in Nam_Buf
634
635 loop
636 if N > Buflen or else Buffer (N) = ASCII.LF then
637 FailN ("incorrectly formatted line for");
638 end if;
639
640 -- Name is terminated by two blanks
641
642 exit when N < Buflen and then Buffer (N .. N + 1) = " ";
643
644 Nam_Len := Nam_Len + 1;
645
646 if Nam_Len > Nam_Buf'Last then
647 Fail ("name too long");
648 end if;
649
650 Nam_Buf (Nam_Len) := Buffer (N);
651 N := N + 1;
652 end loop;
653
654 Check_Spaces;
655 end Get_Name;
656
657 -------------
658 -- Get_Nat --
659 -------------
660
661 function Get_Nat return Natural is
662 Result : Natural := 0;
663
664 begin
665 loop
666 if N > Buflen
667 or else Buffer (N) not in '0' .. '9'
668 or else Result > 999
669 then
670 FailN ("bad value for");
671 end if;
672
673 Result := Result * 10 + (Character'Pos (Buffer (N)) - 48);
674 N := N + 1;
675
676 exit when N <= Buflen
677 and then (Buffer (N) = ASCII.LF or else Buffer (N) = ' ');
678 end loop;
679
680 return Result;
681 end Get_Nat;
682
683 -----------------
684 -- Skip_Spaces --
685 -----------------
686
687 procedure Skip_Spaces is
688 begin
689 while N <= Buflen and Buffer (N) = ' ' loop
690 N := N + 1;
691 end loop;
692 end Skip_Spaces;
693
694 -- Start of processing for Read_Target_Dependent_Values
695
696 begin
697 File_Desc := Open_Read (File_Name, Text);
698
699 if File_Desc = Invalid_FD then
700 Fail ("cannot read file " & File_Name);
701 end if;
702
703 Buflen := Read (File_Desc, Buffer'Address, Buffer'Length);
704
705 Close (File_Desc);
706
707 if Buflen = Buffer'Length then
708 Fail ("file is too long: " & File_Name);
709 end if;
710
711 -- Scan through file for properly formatted entries in first section
712
713 N := 1;
714 while N <= Buflen and then Buffer (N) /= ASCII.LF loop
715 Get_Name;
716
717 -- Validate name and get corresponding value pointer
718
719 VP := null;
720
721 for J in DTN'Range loop
722 if DTN (J).all = Nam_Buf (1 .. Nam_Len) then
723 VP := To_ANat (DTV (J));
724 DTR (J) := True;
725 exit;
726 end if;
727 end loop;
728
729 if VP = null then
730 FailN ("unrecognized name");
731 end if;
732
733 -- Scan out value
734
735 VP.all := Get_Nat;
736
737 if N > Buflen or else Buffer (N) /= ASCII.LF then
738 FailN ("misformatted line for");
739 end if;
740
741 N := N + 1; -- skip LF
742 end loop;
743
744 -- Fall through this loop when all lines in first section read.
745 -- Check that values have been supplied for all entries.
746
747 for J in DTR'Range loop
748 if not DTR (J) then
749 -- Make an exception for Long_Long_Long_Size???
750
751 if DTN (J) = S_Long_Long_Long_Size'Unrestricted_Access then
752 Long_Long_Long_Size := Long_Long_Size;
753
754 else
755 Fail ("missing entry for " & DTN (J).all & " in file "
756 & File_Name);
757 end if;
758 end if;
759 end loop;
760
761 -- Now acquire FPT entries
762
763 if N >= Buflen then
764 Fail ("missing entries for FPT modes in file " & File_Name);
765 end if;
766
767 if Buffer (N) = ASCII.LF then
768 N := N + 1;
769 else
770 Fail ("missing blank line in file " & File_Name);
771 end if;
772
773 Num_FPT_Modes := 0;
774 while N <= Buflen loop
775 Get_Name;
776
777 Num_FPT_Modes := Num_FPT_Modes + 1;
778
779 declare
780 E : FPT_Mode_Entry renames FPT_Mode_Table (Num_FPT_Modes);
781
782 begin
783 E.NAME := new String'(Nam_Buf (1 .. Nam_Len));
784
785 if Long_Double_Index < 0 and then E.NAME.all = "long double" then
786 Long_Double_Index := Num_FPT_Modes;
787 end if;
788
789 E.DIGS := Get_Nat;
790 Check_Spaces;
791
792 case Buffer (N) is
793 when 'I' =>
794 E.FLOAT_REP := IEEE_Binary;
795
796 when others =>
797 FailN ("bad float rep field for");
798 end case;
799
800 N := N + 1;
801 Check_Spaces;
802
803 E.PRECISION := Get_Nat;
804 Check_Spaces;
805
806 E.ALIGNMENT := Get_Nat;
807
808 if Buffer (N) /= ASCII.LF then
809 FailN ("junk at end of line for");
810 end if;
811
812 -- ??? We do not read E.SIZE, see Write_Target_Dependent_Values
813
814 E.SIZE :=
815 (E.PRECISION + E.ALIGNMENT - 1) / E.ALIGNMENT * E.ALIGNMENT;
816
817 N := N + 1;
818 end;
819 end loop;
820 end Read_Target_Dependent_Values;
821
822 -- Package Initialization, set target dependent values. This must be done
823 -- early on, before we start accessing various compiler packages, since
824 -- these values are used all over the place.
825
826 begin
827 -- First step: see if the -gnateT switch is present. As we have noted,
828 -- this has to be done very early, so cannot depend on the normal circuit
829 -- for reading switches and setting switches in Opt. The following code
830 -- will set Opt.Target_Dependent_Info_Read_Name if the switch -gnateT=name
831 -- is present in the options string.
832
833 declare
834 type Arg_Array is array (Nat) of Big_String_Ptr;
835 type Arg_Array_Ptr is access Arg_Array;
836 -- Types to access compiler arguments
837
838 save_argc : Nat;
839 pragma Import (C, save_argc);
840 -- Saved value of argc (number of arguments), imported from misc.c
841
842 save_argv : Arg_Array_Ptr;
843 pragma Import (C, save_argv);
844 -- Saved value of argv (argument pointers), imported from misc.c
845
846 gnat_argc : Nat;
847 gnat_argv : Arg_Array_Ptr;
848 pragma Import (C, gnat_argc);
849 pragma Import (C, gnat_argv);
850 -- If save_argv is not set, default to gnat_argc/argv
851
852 argc : Nat;
853 argv : Arg_Array_Ptr;
854
855 function Len_Arg (Arg : Big_String_Ptr) return Nat;
856 -- Determine length of argument Arg (a nul terminated C string).
857
858 -------------
859 -- Len_Arg --
860 -------------
861
862 function Len_Arg (Arg : Big_String_Ptr) return Nat is
863 begin
864 for J in 1 .. Nat'Last loop
865 if Arg (Natural (J)) = ASCII.NUL then
866 return J - 1;
867 end if;
868 end loop;
869
870 raise Program_Error;
871 end Len_Arg;
872
873 begin
874 if save_argv /= null then
875 argv := save_argv;
876 argc := save_argc;
877 else
878 -- Case of a non-GCC compiler, e.g. gnat2why or gnat2scil
879 argv := gnat_argv;
880 argc := gnat_argc;
881 end if;
882
883 -- Loop through arguments looking for -gnateT, also look for -gnatd.b
884
885 for Arg in 1 .. argc - 1 loop
886 declare
887 Argv_Ptr : constant Big_String_Ptr := argv (Arg);
888 Argv_Len : constant Nat := Len_Arg (Argv_Ptr);
889
890 begin
891 if Argv_Len > 8
892 and then Argv_Ptr (1 .. 8) = "-gnateT="
893 then
894 Opt.Target_Dependent_Info_Read_Name :=
895 new String'(Argv_Ptr (9 .. Natural (Argv_Len)));
896
897 elsif Argv_Len >= 8
898 and then Argv_Ptr (1 .. 8) = "-gnatd.b"
899 then
900 Debug_Flag_Dot_B := True;
901 end if;
902 end;
903 end loop;
904 end;
905
906 -- Case of reading the target dependent values from file
907
908 -- This is bit more complex than might be expected, because it has to be
909 -- done very early. All kinds of packages depend on these values, and we
910 -- can't wait till the normal processing of reading command line switches
911 -- etc to read the file. We do this at the System.OS_Lib level since it is
912 -- too early to be using Osint directly.
913
914 if Opt.Target_Dependent_Info_Read_Name /= null then
915 Read_Target_Dependent_Values (Target_Dependent_Info_Read_Name.all);
916 else
917 -- If the back-end comes with a target config file, then use it
918 -- to set the values
919
920 declare
921 Back_End_Config_File : constant String_Ptr :=
922 Get_Back_End_Config_File;
923 begin
924 if Back_End_Config_File /= null then
925 pragma Gnat_Annotate
926 (CodePeer, Intentional, "test always false",
927 "some variant body will return non null");
928 Read_Target_Dependent_Values (Back_End_Config_File.all);
929
930 -- Otherwise we get all values from the back end directly
931
932 else
933 Bits_BE := Get_Bits_BE;
934 Bits_Per_Unit := Get_Bits_Per_Unit;
935 Bits_Per_Word := Get_Bits_Per_Word;
936 Bytes_BE := Get_Bytes_BE;
937 Char_Size := Get_Char_Size;
938 Double_Float_Alignment := Get_Double_Float_Alignment;
939 Double_Scalar_Alignment := Get_Double_Scalar_Alignment;
940 Float_Words_BE := Get_Float_Words_BE;
941 Int_Size := Get_Int_Size;
942 Long_Long_Long_Size := Get_Long_Long_Long_Size;
943 Long_Long_Size := Get_Long_Long_Size;
944 Long_Size := Get_Long_Size;
945 Maximum_Alignment := Get_Maximum_Alignment;
946 Max_Unaligned_Field := 1;
947 Pointer_Size := Get_Pointer_Size;
948 Short_Enums := Get_Short_Enums;
949 Short_Size := Get_Short_Size;
950 Strict_Alignment := Get_Strict_Alignment;
951 System_Allocator_Alignment := Get_System_Allocator_Alignment;
952 Wchar_T_Size := Get_Wchar_T_Size;
953 Words_BE := Get_Words_BE;
954
955 -- Let the back-end register its floating point types and compute
956 -- the sizes of our standard types from there:
957
958 Num_FPT_Modes := 0;
959 Register_Back_End_Types (Register_Float_Type'Access);
960
961 declare
962 T : FPT_Mode_Entry renames
963 FPT_Mode_Table (FPT_Mode_Index_For (S_Float));
964 begin
965 Float_Size := Pos (T.SIZE);
966 end;
967
968 declare
969 T : FPT_Mode_Entry renames
970 FPT_Mode_Table (FPT_Mode_Index_For (S_Long_Float));
971 begin
972 Double_Size := Pos (T.SIZE);
973 end;
974
975 declare
976 T : FPT_Mode_Entry renames
977 FPT_Mode_Table (FPT_Mode_Index_For (S_Long_Long_Float));
978 begin
979 Long_Double_Size := Pos (T.SIZE);
980 end;
981
982 end if;
983 end;
984 end if;
985 end Set_Targ;
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