1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
9 -- Copyright (C) 1999-2012, 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. 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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Csets; use Csets;
28 with Osint; use Osint;
29 with Output; use Output;
31 package body Targparm is
34 Parameters_Obtained : Boolean := False;
35 -- Set True after first call to Get_Target_Parameters. Used to avoid
36 -- reading system.ads more than once, since it cannot change.
38 -- The following array defines a tag name for each entry
42 ACR, -- Always_Compatible_Rep
43 ASD, -- Atomic_Sync_Default
44 BDC, -- Backend_Divide_Checks
45 BOC, -- Backend_Overflow_Checks
46 CLA, -- Command_Line_Args
48 CRT, -- Configurable_Run_Times
49 D32, -- Duration_32_Bits
51 EXS, -- Exit_Status_Supported
52 FEL, -- Frontend_Layout
53 FFO, -- Fractional_Fixed_Ops
55 MOV, -- Machine_Overflows
56 MRN, -- Machine_Rounds
57 PAS, -- Preallocated_Stacks
58 RTX, -- RTX_RTSS_Kernel_Module
59 SAG, -- Support_Aggregates
60 SAP, -- Support_Atomic_Primitives
61 SCA, -- Support_Composite_Assign
62 SCC, -- Support_Composite_Compare
63 SCD, -- Stack_Check_Default
64 SCL, -- Stack_Check_Limits
65 SCP, -- Stack_Check_Probes
66 SLS, -- Support_Long_Shifts
68 SSL, -- Suppress_Standard_Library
69 UAM, -- Use_Ada_Main_Program_Name
71 ZCD); -- ZCX_By_Default
73 Targparm_Flags : array (Targparm_Tags) of Boolean := (others => False);
74 -- Flag is set True if corresponding parameter is scanned
76 -- The following list of string constants gives the parameter names
78 AAM_Str : aliased constant Source_Buffer := "AAMP";
79 ACR_Str : aliased constant Source_Buffer := "Always_Compatible_Rep";
80 ASD_Str : aliased constant Source_Buffer := "Atomic_Sync_Default";
81 BDC_Str : aliased constant Source_Buffer := "Backend_Divide_Checks";
82 BOC_Str : aliased constant Source_Buffer := "Backend_Overflow_Checks";
83 CLA_Str : aliased constant Source_Buffer := "Command_Line_Args";
84 CLI_Str : aliased constant Source_Buffer := "CLI";
85 CRT_Str : aliased constant Source_Buffer := "Configurable_Run_Time";
86 D32_Str : aliased constant Source_Buffer := "Duration_32_Bits";
87 DEN_Str : aliased constant Source_Buffer := "Denorm";
88 EXS_Str : aliased constant Source_Buffer := "Exit_Status_Supported";
89 FEL_Str : aliased constant Source_Buffer := "Frontend_Layout";
90 FFO_Str : aliased constant Source_Buffer := "Fractional_Fixed_Ops";
91 JVM_Str : aliased constant Source_Buffer := "JVM";
92 MOV_Str : aliased constant Source_Buffer := "Machine_Overflows";
93 MRN_Str : aliased constant Source_Buffer := "Machine_Rounds";
94 PAS_Str : aliased constant Source_Buffer := "Preallocated_Stacks";
95 RTX_Str : aliased constant Source_Buffer := "RTX_RTSS_Kernel_Module";
96 SAG_Str : aliased constant Source_Buffer := "Support_Aggregates";
97 SAP_Str : aliased constant Source_Buffer := "Support_Atomic_Primitives";
98 SCA_Str : aliased constant Source_Buffer := "Support_Composite_Assign";
99 SCC_Str : aliased constant Source_Buffer := "Support_Composite_Compare";
100 SCD_Str : aliased constant Source_Buffer := "Stack_Check_Default";
101 SCL_Str : aliased constant Source_Buffer := "Stack_Check_Limits";
102 SCP_Str : aliased constant Source_Buffer := "Stack_Check_Probes";
103 SLS_Str : aliased constant Source_Buffer := "Support_Long_Shifts";
104 SNZ_Str : aliased constant Source_Buffer := "Signed_Zeros";
105 SSL_Str : aliased constant Source_Buffer := "Suppress_Standard_Library";
106 UAM_Str : aliased constant Source_Buffer := "Use_Ada_Main_Program_Name";
107 VMS_Str : aliased constant Source_Buffer := "OpenVMS";
108 ZCD_Str : aliased constant Source_Buffer := "ZCX_By_Default";
110 -- The following defines a set of pointers to the above strings,
111 -- indexed by the tag values.
113 type Buffer_Ptr is access constant Source_Buffer;
114 Targparm_Str : constant array (Targparm_Tags) of Buffer_Ptr :=
147 -----------------------
148 -- Local Subprograms --
149 -----------------------
151 procedure Set_Profile_Restrictions (P : Profile_Name);
152 -- Set Restrictions_On_Target for the given profile
154 ---------------------------
155 -- Get_Target_Parameters --
156 ---------------------------
158 -- Version which reads in system.ads
160 procedure Get_Target_Parameters is
161 Text : Source_Buffer_Ptr;
165 if Parameters_Obtained then
169 Name_Buffer (1 .. 10) := "system.ads";
172 Read_Source_File (Name_Find, Lo => 0, Hi => Hi, Src => Text);
175 Write_Line ("fatal error, run-time library not installed correctly");
176 Write_Line ("cannot locate file system.ads");
177 raise Unrecoverable_Error;
180 Get_Target_Parameters
181 (System_Text => Text,
184 end Get_Target_Parameters;
186 -- Version where caller supplies system.ads text
188 procedure Get_Target_Parameters
189 (System_Text : Source_Buffer_Ptr;
190 Source_First : Source_Ptr;
191 Source_Last : Source_Ptr)
194 -- Scans source buffer containing source of system.ads
196 Fatal : Boolean := False;
197 -- Set True if a fatal error is detected
200 -- Records boolean from system line
203 if Parameters_Obtained then
206 Parameters_Obtained := True;
209 Opt.Address_Is_Private := False;
212 Line_Loop : while System_Text (P .. P + 10) /= "end System;" loop
214 -- Skip comments quickly
216 if System_Text (P) = '-' then
217 goto Line_Loop_Continue;
219 -- Test for type Address is private
221 elsif System_Text (P .. P + 26) = " type Address is private;" then
222 Opt.Address_Is_Private := True;
224 goto Line_Loop_Continue;
226 -- Test for pragma Profile (Ravenscar);
228 elsif System_Text (P .. P + 26) =
229 "pragma Profile (Ravenscar);"
231 Set_Profile_Restrictions (Ravenscar);
232 Opt.Task_Dispatching_Policy := 'F';
233 Opt.Locking_Policy := 'C';
235 goto Line_Loop_Continue;
237 -- Test for pragma Profile (Restricted);
239 elsif System_Text (P .. P + 27) =
240 "pragma Profile (Restricted);"
242 Set_Profile_Restrictions (Restricted);
244 goto Line_Loop_Continue;
246 -- Test for pragma Restrictions
248 elsif System_Text (P .. P + 20) = "pragma Restrictions (" then
251 Rloop : for K in All_Boolean_Restrictions loop
253 Rname : constant String := Restriction_Id'Image (K);
256 for J in Rname'Range loop
257 if Fold_Upper (System_Text (P + Source_Ptr (J - 1)))
264 if System_Text (P + Rname'Length) = ')' then
265 Restrictions_On_Target.Set (K) := True;
266 goto Line_Loop_Continue;
274 Ploop : for K in All_Parameter_Restrictions loop
276 Rname : constant String :=
277 All_Parameter_Restrictions'Image (K);
283 for J in Rname'Range loop
284 if Fold_Upper (System_Text (P + Source_Ptr (J - 1)))
291 if System_Text (P + Rname'Length .. P + Rname'Length + 3) =
294 P := P + Rname'Length + 4;
298 if System_Text (P) in '0' .. '9' then
300 pragma Unsuppress (Overflow_Check);
303 -- Accumulate next digit
306 Character'Pos (System_Text (P)) -
310 -- On overflow, we just ignore the pragma since
311 -- that is the standard handling in this case.
313 when Constraint_Error =>
314 goto Line_Loop_Continue;
317 elsif System_Text (P) = '_' then
320 elsif System_Text (P) = ')' then
321 Restrictions_On_Target.Value (K) := V;
322 Restrictions_On_Target.Set (K) := True;
323 goto Line_Loop_Continue;
343 ("fatal error: system.ads is incorrectly formatted");
344 Write_Str ("unrecognized or incorrect restrictions pragma: ");
346 while System_Text (P) /= ')'
348 System_Text (P) /= ASCII.LF
350 Write_Char (System_Text (P));
358 -- Test for pragma Detect_Blocking;
360 elsif System_Text (P .. P + 22) = "pragma Detect_Blocking;" then
362 Opt.Detect_Blocking := True;
363 goto Line_Loop_Continue;
367 elsif System_Text (P .. P + 20) = "pragma Discard_Names;" then
369 Opt.Global_Discard_Names := True;
370 goto Line_Loop_Continue;
374 elsif System_Text (P .. P + 22) = "pragma Locking_Policy (" then
376 Opt.Locking_Policy := System_Text (P);
377 Opt.Locking_Policy_Sloc := System_Location;
378 goto Line_Loop_Continue;
382 elsif System_Text (P .. P + 24) = "pragma Normalize_Scalars;" then
384 Opt.Normalize_Scalars := True;
385 Opt.Init_Or_Norm_Scalars := True;
386 goto Line_Loop_Continue;
390 elsif System_Text (P .. P + 19) = "pragma Polling (On);" then
392 Opt.Polling_Required := True;
393 goto Line_Loop_Continue;
395 -- Ignore pragma Pure (System)
397 elsif System_Text (P .. P + 20) = "pragma Pure (System);" then
399 goto Line_Loop_Continue;
403 elsif System_Text (P .. P + 22) = "pragma Queuing_Policy (" then
405 Opt.Queuing_Policy := System_Text (P);
406 Opt.Queuing_Policy_Sloc := System_Location;
407 goto Line_Loop_Continue;
409 -- Suppress_Exception_Locations
411 elsif System_Text (P .. P + 35) =
412 "pragma Suppress_Exception_Locations;"
415 Opt.Exception_Locations_Suppressed := True;
416 goto Line_Loop_Continue;
418 -- Task_Dispatching Policy
420 elsif System_Text (P .. P + 31) =
421 "pragma Task_Dispatching_Policy ("
424 Opt.Task_Dispatching_Policy := System_Text (P);
425 Opt.Task_Dispatching_Policy_Sloc := System_Location;
426 goto Line_Loop_Continue;
428 -- No other pragmas are permitted
430 elsif System_Text (P .. P + 6) = "pragma " then
432 Write_Line ("unrecognized line in system.ads: ");
434 while System_Text (P) /= ')'
435 and then System_Text (P) /= ASCII.LF
437 Write_Char (System_Text (P));
445 -- See if we have a Run_Time_Name
447 elsif System_Text (P .. P + 38) =
448 " Run_Time_Name : constant String := """
453 while System_Text (P) in 'A' .. 'Z'
455 System_Text (P) in 'a' .. 'z'
457 System_Text (P) in '0' .. '9'
459 System_Text (P) = ' '
461 System_Text (P) = '_'
463 Add_Char_To_Name_Buffer (System_Text (P));
467 if System_Text (P) /= '"'
468 or else System_Text (P + 1) /= ';'
469 or else (System_Text (P + 2) /= ASCII.LF
471 System_Text (P + 2) /= ASCII.CR)
475 ("incorrectly formatted Run_Time_Name in system.ads");
480 Run_Time_Name_On_Target := Name_Enter;
483 goto Line_Loop_Continue;
485 -- See if we have an Executable_Extension
487 elsif System_Text (P .. P + 45) =
488 " Executable_Extension : constant String := """
493 while System_Text (P) /= '"'
494 and then System_Text (P) /= ASCII.LF
496 Add_Char_To_Name_Buffer (System_Text (P));
500 if System_Text (P) /= '"' or else System_Text (P + 1) /= ';' then
503 ("incorrectly formatted Executable_Extension in system.ads");
508 Executable_Extension_On_Target := Name_Enter;
511 goto Line_Loop_Continue;
513 -- Next see if we have a configuration parameter
516 Config_Param_Loop : for K in Targparm_Tags loop
517 if System_Text (P + 3 .. P + 2 + Targparm_Str (K)'Length) =
520 P := P + 3 + Targparm_Str (K)'Length;
522 if Targparm_Flags (K) then
525 ("fatal error: system.ads is incorrectly formatted");
526 Write_Str ("duplicate line for parameter: ");
528 for J in Targparm_Str (K)'Range loop
529 Write_Char (Targparm_Str (K).all (J));
537 Targparm_Flags (K) := True;
540 while System_Text (P) /= ':'
541 or else System_Text (P + 1) /= '='
548 while System_Text (P) = ' ' loop
552 Result := (System_Text (P) = 'T');
555 when AAM => AAMP_On_Target := Result;
556 when ACR => Always_Compatible_Rep_On_Target := Result;
557 when ASD => Atomic_Sync_Default_On_Target := Result;
558 when BDC => Backend_Divide_Checks_On_Target := Result;
559 when BOC => Backend_Overflow_Checks_On_Target := Result;
560 when CLA => Command_Line_Args_On_Target := Result;
563 VM_Target := CLI_Target;
564 Tagged_Type_Expansion := False;
566 -- This is wrong, this processing should be done in
567 -- Gnat1drv.Adjust_Global_Switches. It is not the
568 -- right level for targparm to know about tagged
571 when CRT => Configurable_Run_Time_On_Target := Result;
572 when D32 => Duration_32_Bits_On_Target := Result;
573 when DEN => Denorm_On_Target := Result;
574 when EXS => Exit_Status_Supported_On_Target := Result;
575 when FEL => Frontend_Layout_On_Target := Result;
576 when FFO => Fractional_Fixed_Ops_On_Target := Result;
579 VM_Target := JVM_Target;
580 Tagged_Type_Expansion := False;
582 -- This is wrong, this processing should be done in
583 -- Gnat1drv.Adjust_Global_Switches. It is not the
584 -- right level for targparm to know about tagged
587 when MOV => Machine_Overflows_On_Target := Result;
588 when MRN => Machine_Rounds_On_Target := Result;
589 when PAS => Preallocated_Stacks_On_Target := Result;
590 when RTX => RTX_RTSS_Kernel_Module_On_Target := Result;
591 when SAG => Support_Aggregates_On_Target := Result;
592 when SAP => Support_Atomic_Primitives_On_Target := Result;
593 when SCA => Support_Composite_Assign_On_Target := Result;
594 when SCC => Support_Composite_Compare_On_Target := Result;
595 when SCD => Stack_Check_Default_On_Target := Result;
596 when SCL => Stack_Check_Limits_On_Target := Result;
597 when SCP => Stack_Check_Probes_On_Target := Result;
598 when SLS => Support_Long_Shifts_On_Target := Result;
599 when SSL => Suppress_Standard_Library_On_Target := Result;
600 when SNZ => Signed_Zeros_On_Target := Result;
601 when UAM => Use_Ada_Main_Program_Name_On_Target := Result;
602 when VMS => OpenVMS_On_Target := Result;
603 when ZCD => ZCX_By_Default_On_Target := Result;
605 goto Line_Loop_Continue;
608 -- Here we are seeing a parameter we do not understand. We
609 -- simply ignore this (will happen when an old compiler is
610 -- used to compile a newer version of GNAT which does not
611 -- support the parameter).
613 end loop Config_Param_Loop;
616 -- Here after processing one line of System spec
618 <<Line_Loop_Continue>>
620 while System_Text (P) /= CR and then System_Text (P) /= LF loop
622 exit when P >= Source_Last;
625 while System_Text (P) = CR or else System_Text (P) = LF loop
627 exit when P >= Source_Last;
630 if P >= Source_Last then
632 Write_Line ("fatal error, system.ads not formatted correctly");
633 Write_Line ("unexpected end of file");
635 raise Unrecoverable_Error;
639 -- Now that OpenVMS_On_Target has been given its definitive value,
640 -- change the multi-unit index character from '~' to '$' for OpenVMS.
642 if OpenVMS_On_Target then
643 Multi_Unit_Index_Character := '$';
647 raise Unrecoverable_Error;
649 end Get_Target_Parameters;
651 ------------------------------
652 -- Set_Profile_Restrictions --
653 ------------------------------
655 procedure Set_Profile_Restrictions (P : Profile_Name) is
656 R : Restriction_Flags renames Profile_Info (P).Set;
657 V : Restriction_Values renames Profile_Info (P).Value;
659 for J in R'Range loop
661 Restrictions_On_Target.Set (J) := True;
663 if J in All_Parameter_Restrictions then
664 Restrictions_On_Target.Value (J) := V (J);
668 end Set_Profile_Restrictions;