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2016-10-26 François Dumont <fdumont@gcc.gnu.org>
[official-gcc.git] / gcc / ada / set_targ.adb
blob1020d5c1240b029f09c29a7ff4be8a333b412165
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) 2013-2016, 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 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_Size : constant Str := "Long_Long_Size";
59 S_Long_Size : constant Str := "Long_Size";
60 S_Maximum_Alignment : constant Str := "Maximum_Alignment";
61 S_Max_Unaligned_Field : constant Str := "Max_Unaligned_Field";
62 S_Pointer_Size : constant Str := "Pointer_Size";
63 S_Short_Enums : constant Str := "Short_Enums";
64 S_Short_Size : constant Str := "Short_Size";
65 S_Strict_Alignment : constant Str := "Strict_Alignment";
66 S_System_Allocator_Alignment : constant Str := "System_Allocator_Alignment";
67 S_Wchar_T_Size : constant Str := "Wchar_T_Size";
68 S_Words_BE : constant Str := "Words_BE";
69
70 -- Table of names
71
72 type AStr is access all String;
73
74 DTN : constant array (Nat range <>) of AStr := (
75 S_Bits_BE 'Unrestricted_Access,
76 S_Bits_Per_Unit 'Unrestricted_Access,
77 S_Bits_Per_Word 'Unrestricted_Access,
78 S_Bytes_BE 'Unrestricted_Access,
79 S_Char_Size 'Unrestricted_Access,
80 S_Double_Float_Alignment 'Unrestricted_Access,
81 S_Double_Scalar_Alignment 'Unrestricted_Access,
82 S_Double_Size 'Unrestricted_Access,
83 S_Float_Size 'Unrestricted_Access,
84 S_Float_Words_BE 'Unrestricted_Access,
85 S_Int_Size 'Unrestricted_Access,
86 S_Long_Double_Size 'Unrestricted_Access,
87 S_Long_Long_Size 'Unrestricted_Access,
88 S_Long_Size 'Unrestricted_Access,
89 S_Maximum_Alignment 'Unrestricted_Access,
90 S_Max_Unaligned_Field 'Unrestricted_Access,
91 S_Pointer_Size 'Unrestricted_Access,
92 S_Short_Enums 'Unrestricted_Access,
93 S_Short_Size 'Unrestricted_Access,
94 S_Strict_Alignment 'Unrestricted_Access,
95 S_System_Allocator_Alignment 'Unrestricted_Access,
96 S_Wchar_T_Size 'Unrestricted_Access,
97 S_Words_BE 'Unrestricted_Access);
98
99 -- Table of corresponding value pointers
100
101 DTV : constant array (Nat range <>) of System.Address := (
102 Bits_BE 'Address,
103 Bits_Per_Unit 'Address,
104 Bits_Per_Word 'Address,
105 Bytes_BE 'Address,
106 Char_Size 'Address,
107 Double_Float_Alignment 'Address,
108 Double_Scalar_Alignment 'Address,
109 Double_Size 'Address,
110 Float_Size 'Address,
111 Float_Words_BE 'Address,
112 Int_Size 'Address,
113 Long_Double_Size 'Address,
114 Long_Long_Size 'Address,
115 Long_Size 'Address,
116 Maximum_Alignment 'Address,
117 Max_Unaligned_Field 'Address,
118 Pointer_Size 'Address,
119 Short_Enums 'Address,
120 Short_Size 'Address,
121 Strict_Alignment 'Address,
122 System_Allocator_Alignment 'Address,
123 Wchar_T_Size 'Address,
124 Words_BE 'Address);
125
126 DTR : array (Nat range DTV'Range) of Boolean := (others => False);
127 -- Table of flags used to validate that all values are present in file
128
129 -----------------------
130 -- Local Subprograms --
131 -----------------------
132
133 procedure Read_Target_Dependent_Values (File_Name : String);
134 -- Read target dependent values from File_Name, and set the target
135 -- dependent values (global variables) declared in this package.
136
137 procedure Fail (E : String);
138 pragma No_Return (Fail);
139 -- Terminate program with fatal error message passed as parameter
140
141 procedure Register_Float_Type
142 (Name : C_String;
143 Digs : Natural;
144 Complex : Boolean;
145 Count : Natural;
146 Float_Rep : Float_Rep_Kind;
147 Precision : Positive;
148 Size : Positive;
149 Alignment : Natural);
150 pragma Convention (C, Register_Float_Type);
151 -- Call back to allow the back end to register available types. This call
152 -- back makes entries in the FPT_Mode_Table for any floating point types
153 -- reported by the back end. Name is the name of the type as a normal
154 -- format Null-terminated string. Digs is the number of digits, where 0
155 -- means it is not a fpt type (ignored during registration). Complex is
156 -- non-zero if the type has real and imaginary parts (also ignored during
157 -- registration). Count is the number of elements in a vector type (zero =
158 -- not a vector, registration ignores vectors). Float_Rep shows the kind of
159 -- floating-point type, and Precision, Size and Alignment are the precision
160 -- size and alignment in bits.
161 --
162 -- The only types that are actually registered have Digs non-zero, Complex
163 -- zero (false), and Count zero (not a vector). The Long_Double_Index
164 -- variable below is updated to indicate the index at which a "long double"
165 -- type can be found if it gets registered at all.
166
167 Long_Double_Index : Integer := -1;
168 -- Once all the floating point types have been registered, the index in
169 -- FPT_Mode_Table at which "long double" can be found, if anywhere. A
170 -- negative value means that no "long double" has been registered. This
171 -- is useful to know whether we have a "long double" available at all and
172 -- get at it's characteristics without having to search the FPT_Mode_Table
173 -- when we need to decide which C type should be used as the basis for
174 -- Long_Long_Float in Ada.
175
176 function FPT_Mode_Index_For (Name : String) return Natural;
177 -- Return the index in FPT_Mode_Table that designates the entry
178 -- corresponding to the C type named Name. Raise Program_Error if
179 -- there is no such entry.
180
181 function FPT_Mode_Index_For (T : S_Float_Types) return Natural;
182 -- Return the index in FPT_Mode_Table that designates the entry for
183 -- a back-end type suitable as a basis to construct the standard Ada
184 -- floating point type identified by T.
185
186 ----------------
187 -- C_Type_For --
188 ----------------
189
190 function C_Type_For (T : S_Float_Types) return String is
191
192 -- ??? For now, we don't have a good way to tell the widest float
193 -- type with hardware support. Basically, GCC knows the size of that
194 -- type, but on x86-64 there often are two or three 128-bit types,
195 -- one double extended that has 18 decimal digits, a 128-bit quad
196 -- precision type with 33 digits and possibly a 128-bit decimal float
197 -- type with 34 digits. As a workaround, we define Long_Long_Float as
198 -- C's "long double" if that type exists and has at most 18 digits,
199 -- or otherwise the same as Long_Float.
200
201 Max_HW_Digs : constant := 18;
202 -- Maximum hardware digits supported
203
204 begin
205 case T is
206 when S_Short_Float | S_Float =>
207 return "float";
208 when S_Long_Float =>
209 return "double";
210 when S_Long_Long_Float =>
211 if Long_Double_Index >= 0
212 and then FPT_Mode_Table (Long_Double_Index).DIGS <= Max_HW_Digs
213 then
214 return "long double";
215 else
216 return "double";
217 end if;
218 end case;
219 end C_Type_For;
220
221 ----------
222 -- Fail --
223 ----------
224
225 procedure Fail (E : String) is
226 E_Fatal : constant := 4;
227 -- Code for fatal error
228
229 begin
230 Write_Str (E);
231 Write_Eol;
232 OS_Exit (E_Fatal);
233 end Fail;
234
235 ------------------------
236 -- FPT_Mode_Index_For --
237 ------------------------
238
239 function FPT_Mode_Index_For (Name : String) return Natural is
240 begin
241 for J in FPT_Mode_Table'First .. Num_FPT_Modes loop
242 if FPT_Mode_Table (J).NAME.all = Name then
243 return J;
244 end if;
245 end loop;
246
247 raise Program_Error;
248 end FPT_Mode_Index_For;
249
250 function FPT_Mode_Index_For (T : S_Float_Types) return Natural is
251 begin
252 return FPT_Mode_Index_For (C_Type_For (T));
253 end FPT_Mode_Index_For;
254
255 -------------------------
256 -- Register_Float_Type --
257 -------------------------
258
259 procedure Register_Float_Type
260 (Name : C_String;
261 Digs : Natural;
262 Complex : Boolean;
263 Count : Natural;
264 Float_Rep : Float_Rep_Kind;
265 Precision : Positive;
266 Size : Positive;
267 Alignment : Natural)
268 is
269 T : String (1 .. Name'Length);
270 Last : Natural := 0;
271
272 procedure Dump;
273 -- Dump information given by the back end for the type to register
274
275 ----------
276 -- Dump --
277 ----------
278
279 procedure Dump is
280 begin
281 Write_Str ("type " & T (1 .. Last) & " is ");
282
283 if Count > 0 then
284 Write_Str ("array (1 .. ");
285 Write_Int (Int (Count));
286
287 if Complex then
288 Write_Str (", 1 .. 2");
289 end if;
290
291 Write_Str (") of ");
292
293 elsif Complex then
294 Write_Str ("array (1 .. 2) of ");
295 end if;
296
297 if Digs > 0 then
298 Write_Str ("digits ");
299 Write_Int (Int (Digs));
300 Write_Line (";");
301
302 Write_Str ("pragma Float_Representation (");
303
304 case Float_Rep is
305 when IEEE_Binary => Write_Str ("IEEE");
306 when AAMP => Write_Str ("AAMP");
307 end case;
308
309 Write_Line (", " & T (1 .. Last) & ");");
310
311 else
312 Write_Str ("mod 2**");
313 Write_Int (Int (Precision / Positive'Max (1, Count)));
314 Write_Line (";");
315 end if;
316
317 if Precision = Size then
318 Write_Str ("for " & T (1 .. Last) & "'Size use ");
319 Write_Int (Int (Size));
320 Write_Line (";");
321
322 else
323 Write_Str ("for " & T (1 .. Last) & "'Value_Size use ");
324 Write_Int (Int (Precision));
325 Write_Line (";");
326
327 Write_Str ("for " & T (1 .. Last) & "'Object_Size use ");
328 Write_Int (Int (Size));
329 Write_Line (";");
330 end if;
331
332 Write_Str ("for " & T (1 .. Last) & "'Alignment use ");
333 Write_Int (Int (Alignment / 8));
334 Write_Line (";");
335 Write_Eol;
336 end Dump;
337
338 -- Start of processing for Register_Float_Type
339
340 begin
341 -- Acquire name
342
343 for J in T'Range loop
344 T (J) := Name (Name'First + J - 1);
345
346 if T (J) = ASCII.NUL then
347 Last := J - 1;
348 exit;
349 end if;
350 end loop;
351
352 -- Dump info if debug flag set
353
354 if Debug_Flag_Dot_B then
355 Dump;
356 end if;
357
358 -- Acquire entry if non-vector non-complex fpt type (digits non-zero)
359
360 if Digs > 0 and then not Complex and then Count = 0 then
361
362 declare
363 This_Name : constant String := T (1 .. Last);
364 begin
365 Num_FPT_Modes := Num_FPT_Modes + 1;
366 FPT_Mode_Table (Num_FPT_Modes) :=
367 (NAME => new String'(This_Name),
368 DIGS => Digs,
369 FLOAT_REP => Float_Rep,
370 PRECISION => Precision,
371 SIZE => Size,
372 ALIGNMENT => Alignment);
373
374 if Long_Double_Index < 0 and then This_Name = "long double" then
375 Long_Double_Index := Num_FPT_Modes;
376 end if;
377 end;
378 end if;
379 end Register_Float_Type;
380
381 -----------------------------------
382 -- Write_Target_Dependent_Values --
383 -----------------------------------
384
385 -- We do this at the System.Os_Lib level, since we have to do the read at
386 -- that level anyway, so it is easier and more consistent to follow the
387 -- same path for the write.
388
389 procedure Write_Target_Dependent_Values is
390 Fdesc : File_Descriptor;
391 OK : Boolean;
392
393 Buffer : String (1 .. 80);
394 Buflen : Natural;
395 -- Buffer used to build line one of file
396
397 type ANat is access all Natural;
398 -- Pointer to Nat or Pos value (it is harmless to treat Pos values and
399 -- Nat values as Natural via Unchecked_Conversion).
400
401 function To_ANat is new Unchecked_Conversion (Address, ANat);
402
403 procedure AddC (C : Character);
404 -- Add one character to buffer
405
406 procedure AddN (N : Natural);
407 -- Add representation of integer N to Buffer, updating Buflen. N
408 -- must be less than 1000, and output is 3 characters with leading
409 -- spaces as needed.
410
411 procedure Write_Line;
412 -- Output contents of Buffer (1 .. Buflen) followed by a New_Line,
413 -- and set Buflen back to zero, ready to write next line.
414
415 ----------
416 -- AddC --
417 ----------
418
419 procedure AddC (C : Character) is
420 begin
421 Buflen := Buflen + 1;
422 Buffer (Buflen) := C;
423 end AddC;
424
425 ----------
426 -- AddN --
427 ----------
428
429 procedure AddN (N : Natural) is
430 begin
431 if N > 999 then
432 raise Program_Error;
433 end if;
434
435 if N > 99 then
436 AddC (Character'Val (48 + N / 100));
437 else
438 AddC (' ');
439 end if;
440
441 if N > 9 then
442 AddC (Character'Val (48 + N / 10 mod 10));
443 else
444 AddC (' ');
445 end if;
446
447 AddC (Character'Val (48 + N mod 10));
448 end AddN;
449
450 ----------------
451 -- Write_Line --
452 ----------------
453
454 procedure Write_Line is
455 begin
456 AddC (ASCII.LF);
457
458 if Buflen /= Write (Fdesc, Buffer'Address, Buflen) then
459 Delete_File (Target_Dependent_Info_Write_Name.all, OK);
460 Fail ("disk full writing file "
461 & Target_Dependent_Info_Write_Name.all);
462 end if;
463
464 Buflen := 0;
465 end Write_Line;
466
467 -- Start of processing for Write_Target_Dependent_Values
468
469 begin
470 Fdesc :=
471 Create_File (Target_Dependent_Info_Write_Name.all, Text);
472
473 if Fdesc = Invalid_FD then
474 Fail ("cannot create file " & Target_Dependent_Info_Write_Name.all);
475 end if;
476
477 -- Loop through values
478
479 for J in DTN'Range loop
480
481 -- Output name
482
483 Buflen := DTN (J)'Length;
484 Buffer (1 .. Buflen) := DTN (J).all;
485
486 -- Line up values
487
488 while Buflen < 26 loop
489 AddC (' ');
490 end loop;
491
492 AddC (' ');
493 AddC (' ');
494
495 -- Output value and write line
496
497 AddN (To_ANat (DTV (J)).all);
498 Write_Line;
499 end loop;
500
501 -- Blank line to separate sections
502
503 Write_Line;
504
505 -- Write lines for registered FPT types
506
507 for J in 1 .. Num_FPT_Modes loop
508 declare
509 E : FPT_Mode_Entry renames FPT_Mode_Table (J);
510 begin
511 Buflen := E.NAME'Last;
512 Buffer (1 .. Buflen) := E.NAME.all;
513
514 -- Pad out to line up values
515
516 while Buflen < 11 loop
517 AddC (' ');
518 end loop;
519
520 AddC (' ');
521 AddC (' ');
522
523 AddN (E.DIGS);
524 AddC (' ');
525 AddC (' ');
526
527 case E.FLOAT_REP is
528 when IEEE_Binary =>
529 AddC ('I');
530 when AAMP =>
531 AddC ('A');
532 end case;
533
534 AddC (' ');
535
536 AddN (E.PRECISION);
537 AddC (' ');
538
539 AddN (E.ALIGNMENT);
540 Write_Line;
541 end;
542 end loop;
543
544 -- Close file
545
546 Close (Fdesc, OK);
547
548 if not OK then
549 Fail ("disk full writing file "
550 & Target_Dependent_Info_Write_Name.all);
551 end if;
552 end Write_Target_Dependent_Values;
553
554 ----------------------------------
555 -- Read_Target_Dependent_Values --
556 ----------------------------------
557
558 procedure Read_Target_Dependent_Values (File_Name : String) is
559 File_Desc : File_Descriptor;
560 N : Natural;
561
562 type ANat is access all Natural;
563 -- Pointer to Nat or Pos value (it is harmless to treat Pos values
564 -- as Nat via Unchecked_Conversion).
565
566 function To_ANat is new Unchecked_Conversion (Address, ANat);
567
568 VP : ANat;
569
570 Buffer : String (1 .. 2000);
571 Buflen : Natural;
572 -- File information and length (2000 easily enough)
573
574 Nam_Buf : String (1 .. 40);
575 Nam_Len : Natural;
576
577 procedure Check_Spaces;
578 -- Checks that we have one or more spaces and skips them
579
580 procedure FailN (S : String);
581 -- Calls Fail adding " name in file xxx", where name is the currently
582 -- gathered name in Nam_Buf, surrounded by quotes, and xxx is the
583 -- name of the file.
584
585 procedure Get_Name;
586 -- Scan out name, leaving it in Nam_Buf with Nam_Len set. Calls
587 -- Skip_Spaces to skip any following spaces. Note that the name is
588 -- terminated by a sequence of at least two spaces.
589
590 function Get_Nat return Natural;
591 -- N on entry points to decimal integer, scan out decimal integer
592 -- and return it, leaving N pointing to following space or LF.
593
594 procedure Skip_Spaces;
595 -- Skip past spaces
596
597 ------------------
598 -- Check_Spaces --
599 ------------------
600
601 procedure Check_Spaces is
602 begin
603 if N > Buflen or else Buffer (N) /= ' ' then
604 FailN ("missing space for");
605 end if;
606
607 Skip_Spaces;
608 return;
609 end Check_Spaces;
610
611 -----------
612 -- FailN --
613 -----------
614
615 procedure FailN (S : String) is
616 begin
617 Fail (S & " """ & Nam_Buf (1 .. Nam_Len) & """ in file "
618 & File_Name);
619 end FailN;
620
621 --------------
622 -- Get_Name --
623 --------------
624
625 procedure Get_Name is
626 begin
627 Nam_Len := 0;
628
629 -- Scan out name and put it in Nam_Buf
630
631 loop
632 if N > Buflen or else Buffer (N) = ASCII.LF then
633 FailN ("incorrectly formatted line for");
634 end if;
635
636 -- Name is terminated by two blanks
637
638 exit when N < Buflen and then Buffer (N .. N + 1) = " ";
639
640 Nam_Len := Nam_Len + 1;
641
642 if Nam_Len > Nam_Buf'Last then
643 Fail ("name too long");
644 end if;
645
646 Nam_Buf (Nam_Len) := Buffer (N);
647 N := N + 1;
648 end loop;
649
650 Check_Spaces;
651 end Get_Name;
652
653 -------------
654 -- Get_Nat --
655 -------------
656
657 function Get_Nat return Natural is
658 Result : Natural := 0;
659
660 begin
661 loop
662 if N > Buflen
663 or else Buffer (N) not in '0' .. '9'
664 or else Result > 999
665 then
666 FailN ("bad value for");
667 end if;
668
669 Result := Result * 10 + (Character'Pos (Buffer (N)) - 48);
670 N := N + 1;
671
672 exit when N <= Buflen
673 and then (Buffer (N) = ASCII.LF or else Buffer (N) = ' ');
674 end loop;
675
676 return Result;
677 end Get_Nat;
678
679 -----------------
680 -- Skip_Spaces --
681 -----------------
682
683 procedure Skip_Spaces is
684 begin
685 while N <= Buflen and Buffer (N) = ' ' loop
686 N := N + 1;
687 end loop;
688 end Skip_Spaces;
689
690 -- Start of processing for Read_Target_Dependent_Values
691
692 begin
693 File_Desc := Open_Read (File_Name, Text);
694
695 if File_Desc = Invalid_FD then
696 Fail ("cannot read file " & File_Name);
697 end if;
698
699 Buflen := Read (File_Desc, Buffer'Address, Buffer'Length);
700
701 Close (File_Desc);
702
703 if Buflen = Buffer'Length then
704 Fail ("file is too long: " & File_Name);
705 end if;
706
707 -- Scan through file for properly formatted entries in first section
708
709 N := 1;
710 while N <= Buflen and then Buffer (N) /= ASCII.LF loop
711 Get_Name;
712
713 -- Validate name and get corresponding value pointer
714
715 VP := null;
716
717 for J in DTN'Range loop
718 if DTN (J).all = Nam_Buf (1 .. Nam_Len) then
719 VP := To_ANat (DTV (J));
720 DTR (J) := True;
721 exit;
722 end if;
723 end loop;
724
725 if VP = null then
726 FailN ("unrecognized name");
727 end if;
728
729 -- Scan out value
730
731 VP.all := Get_Nat;
732
733 if N > Buflen or else Buffer (N) /= ASCII.LF then
734 FailN ("misformatted line for");
735 end if;
736
737 N := N + 1; -- skip LF
738 end loop;
739
740 -- Fall through this loop when all lines in first section read.
741 -- Check that values have been supplied for all entries.
742
743 for J in DTR'Range loop
744 if not DTR (J) then
745 Fail ("missing entry for " & DTN (J).all & " in file "
746 & File_Name);
747 end if;
748 end loop;
749
750 -- Now acquire FPT entries
751
752 if N >= Buflen then
753 Fail ("missing entries for FPT modes in file " & File_Name);
754 end if;
755
756 if Buffer (N) = ASCII.LF then
757 N := N + 1;
758 else
759 Fail ("missing blank line in file " & File_Name);
760 end if;
761
762 Num_FPT_Modes := 0;
763 while N <= Buflen loop
764 Get_Name;
765
766 Num_FPT_Modes := Num_FPT_Modes + 1;
767
768 declare
769 E : FPT_Mode_Entry renames FPT_Mode_Table (Num_FPT_Modes);
770
771 begin
772 E.NAME := new String'(Nam_Buf (1 .. Nam_Len));
773
774 if Long_Double_Index < 0 and then E.NAME.all = "long double" then
775 Long_Double_Index := Num_FPT_Modes;
776 end if;
777
778 E.DIGS := Get_Nat;
779 Check_Spaces;
780
781 case Buffer (N) is
782 when 'I' =>
783 E.FLOAT_REP := IEEE_Binary;
784 when 'A' =>
785 E.FLOAT_REP := AAMP;
786 when others =>
787 FailN ("bad float rep field for");
788 end case;
789
790 N := N + 1;
791 Check_Spaces;
792
793 E.PRECISION := Get_Nat;
794 Check_Spaces;
795
796 E.ALIGNMENT := Get_Nat;
797
798 if Buffer (N) /= ASCII.LF then
799 FailN ("junk at end of line for");
800 end if;
801
802 -- ??? We do not read E.SIZE, see Write_Target_Dependent_Values
803
804 E.SIZE :=
805 (E.PRECISION + E.ALIGNMENT - 1) / E.ALIGNMENT * E.ALIGNMENT;
806
807 N := N + 1;
808 end;
809 end loop;
810 end Read_Target_Dependent_Values;
811
812 -- Package Initialization, set target dependent values. This must be done
813 -- early on, before we start accessing various compiler packages, since
814 -- these values are used all over the place.
815
816 begin
817 -- First step: see if the -gnateT switch is present. As we have noted,
818 -- this has to be done very early, so can not depend on the normal circuit
819 -- for reading switches and setting switches in Opt. The following code
820 -- will set Opt.Target_Dependent_Info_Read_Name if the switch -gnateT=name
821 -- is present in the options string.
822
823 declare
824 type Arg_Array is array (Nat) of Big_String_Ptr;
825 type Arg_Array_Ptr is access Arg_Array;
826 -- Types to access compiler arguments
827
828 save_argc : Nat;
829 pragma Import (C, save_argc);
830 -- Saved value of argc (number of arguments), imported from misc.c
831
832 save_argv : Arg_Array_Ptr;
833 pragma Import (C, save_argv);
834 -- Saved value of argv (argument pointers), imported from misc.c
835
836 gnat_argc : Nat;
837 gnat_argv : Arg_Array_Ptr;
838 pragma Import (C, gnat_argc);
839 pragma Import (C, gnat_argv);
840 -- If save_argv is not set, default to gnat_argc/argv
841
842 argc : Nat;
843 argv : Arg_Array_Ptr;
844
845 function Len_Arg (Arg : Big_String_Ptr) return Nat;
846 -- Determine length of argument Arg (a nul terminated C string).
847
848 -------------
849 -- Len_Arg --
850 -------------
851
852 function Len_Arg (Arg : Big_String_Ptr) return Nat is
853 begin
854 for J in 1 .. Nat'Last loop
855 if Arg (Natural (J)) = ASCII.NUL then
856 return J - 1;
857 end if;
858 end loop;
859
860 raise Program_Error;
861 end Len_Arg;
862
863 begin
864 if save_argv /= null then
865 argv := save_argv;
866 argc := save_argc;
867 else
868 -- Case of a non gcc compiler, e.g. gnat2why or gnat2scil
869 argv := gnat_argv;
870 argc := gnat_argc;
871 end if;
872
873 -- Loop through arguments looking for -gnateT, also look for -gnatd.b
874
875 for Arg in 1 .. argc - 1 loop
876 declare
877 Argv_Ptr : constant Big_String_Ptr := argv (Arg);
878 Argv_Len : constant Nat := Len_Arg (Argv_Ptr);
879
880 begin
881 if Argv_Len > 8
882 and then Argv_Ptr (1 .. 8) = "-gnateT="
883 then
884 Opt.Target_Dependent_Info_Read_Name :=
885 new String'(Argv_Ptr (9 .. Natural (Argv_Len)));
886
887 elsif Argv_Len >= 8
888 and then Argv_Ptr (1 .. 8) = "-gnatd.b"
889 then
890 Debug_Flag_Dot_B := True;
891 end if;
892 end;
893 end loop;
894 end;
895
896 -- Case of reading the target dependent values from file
897
898 -- This is bit more complex than might be expected, because it has to be
899 -- done very early. All kinds of packages depend on these values, and we
900 -- can't wait till the normal processing of reading command line switches
901 -- etc to read the file. We do this at the System.OS_Lib level since it is
902 -- too early to be using Osint directly.
903
904 if Opt.Target_Dependent_Info_Read_Name /= null then
905 Read_Target_Dependent_Values (Target_Dependent_Info_Read_Name.all);
906 else
907 -- If the back-end comes with a target config file, then use it
908 -- to set the values
909
910 declare
911 Back_End_Config_File : constant String_Ptr :=
912 Get_Back_End_Config_File;
913 begin
914 if Back_End_Config_File /= null then
915 Read_Target_Dependent_Values (Back_End_Config_File.all);
916
917 -- Otherwise we get all values from the back end directly
918
919 else
920 Bits_BE := Get_Bits_BE;
921 Bits_Per_Unit := Get_Bits_Per_Unit;
922 Bits_Per_Word := Get_Bits_Per_Word;
923 Bytes_BE := Get_Bytes_BE;
924 Char_Size := Get_Char_Size;
925 Double_Float_Alignment := Get_Double_Float_Alignment;
926 Double_Scalar_Alignment := Get_Double_Scalar_Alignment;
927 Float_Words_BE := Get_Float_Words_BE;
928 Int_Size := Get_Int_Size;
929 Long_Long_Size := Get_Long_Long_Size;
930 Long_Size := Get_Long_Size;
931 Maximum_Alignment := Get_Maximum_Alignment;
932 Max_Unaligned_Field := Get_Max_Unaligned_Field;
933 Pointer_Size := Get_Pointer_Size;
934 Short_Enums := Get_Short_Enums;
935 Short_Size := Get_Short_Size;
936 Strict_Alignment := Get_Strict_Alignment;
937 System_Allocator_Alignment := Get_System_Allocator_Alignment;
938 Wchar_T_Size := Get_Wchar_T_Size;
939 Words_BE := Get_Words_BE;
940
941 -- Let the back-end register its floating point types and compute
942 -- the sizes of our standard types from there:
943
944 Num_FPT_Modes := 0;
945 Register_Back_End_Types (Register_Float_Type'Access);
946
947 declare
948 T : FPT_Mode_Entry renames
949 FPT_Mode_Table (FPT_Mode_Index_For (S_Float));
950 begin
951 Float_Size := Pos (T.SIZE);
952 end;
953
954 declare
955 T : FPT_Mode_Entry renames
956 FPT_Mode_Table (FPT_Mode_Index_For (S_Long_Float));
957 begin
958 Double_Size := Pos (T.SIZE);
959 end;
960
961 declare
962 T : FPT_Mode_Entry renames
963 FPT_Mode_Table (FPT_Mode_Index_For (S_Long_Long_Float));
964 begin
965 Long_Double_Size := Pos (T.SIZE);
966 end;
967
968 end if;
969 end;
970 end if;
971 end Set_Targ;
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