1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2023, 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 -- This is the version of the Back_End package for GCC back ends
28 with Atree
; use Atree
;
29 with Backend_Utils
; use Backend_Utils
;
30 with Debug
; use Debug
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
34 with Osint
; use Osint
;
36 with Osint
.C
; use Osint
.C
;
37 with Namet
; use Namet
;
38 with Nlists
; use Nlists
;
39 with Stand
; use Stand
;
40 with Sinput
; use Sinput
;
41 with Stringt
; use Stringt
;
42 with Switch
; use Switch
;
43 with Switch
.C
; use Switch
.C
;
44 with System
; use System
;
45 with Types
; use Types
;
47 with System
.OS_Lib
; use System
.OS_Lib
;
49 package body Back_End
is
51 type Arg_Array
is array (Nat
) of Big_String_Ptr
;
52 type Arg_Array_Ptr
is access Arg_Array
;
53 -- Types to access compiler arguments
55 flag_stack_check
: Int
;
56 pragma Import
(C
, flag_stack_check
);
57 -- Indicates if stack checking is enabled, imported from misc.c
60 pragma Import
(C
, save_argc
);
61 -- Saved value of argc (number of arguments), imported from misc.c
63 save_argv
: Arg_Array_Ptr
;
64 pragma Import
(C
, save_argv
);
65 -- Saved value of argv (argument pointers), imported from misc.c
67 function Len_Arg
(Arg
: Pos
) return Nat
;
68 -- Determine length of argument number Arg on original gnat1 command line
74 procedure Call_Back_End
(Mode
: Back_End_Mode_Type
) is
76 -- The Source_File_Record type has a lot of components that are
77 -- meaningless to the back end, so a new record type is created
78 -- here to contain the needed information for each file.
80 type File_Info_Type
is record
81 File_Name
: File_Name_Type
;
82 Instance
: Instance_Id
;
83 Num_Source_Lines
: Nat
;
86 File_Info_Array
: array (1 .. Last_Source_File
) of File_Info_Type
;
92 node_offsets_ptr
: Address
;
95 next_node_ptr
: Address
;
96 prev_node_ptr
: Address
;
100 strings_ptr
: Address
;
101 string_chars_ptr
: Address
;
102 list_headers_ptr
: Address
;
105 file_info_ptr
: Address
;
106 gigi_standard_boolean
: Entity_Id
;
107 gigi_standard_integer
: Entity_Id
;
108 gigi_standard_character
: Entity_Id
;
109 gigi_standard_long_long_float
: Entity_Id
;
110 gigi_standard_exception_type
: Entity_Id
;
111 gigi_operating_mode
: Back_End_Mode_Type
);
113 pragma Import
(C
, gigi
);
116 -- Skip call if in -gnatdH mode
118 if Debug_Flag_HH
then
122 -- The back end needs to know the maximum line number that can appear
123 -- in a Sloc, in other words the maximum logical line number.
125 for J
in 1 .. Last_Source_File
loop
126 File_Info_Array
(J
).File_Name
:= Full_Debug_Name
(J
);
127 File_Info_Array
(J
).Instance
:= Instance
(J
);
128 File_Info_Array
(J
).Num_Source_Lines
:=
129 Nat
(Physical_To_Logical
(Last_Source_Line
(J
), J
));
132 -- Deal with case of generating SCIL, we should not be here unless
133 -- debugging CodePeer mode in GNAT.
135 if Generate_SCIL
then
136 Error_Msg_N
("'S'C'I'L generation not available", Cunit
(Main_Unit
));
139 or else (Mode
/= Generate_Object
140 and then not Back_Annotate_Rep_Info
)
146 -- We should be here in GNATprove mode only when debugging GNAT. Do not
147 -- call gigi in that case, as it is not prepared to handle the special
148 -- form of the tree obtained in GNATprove mode.
150 if GNATprove_Mode
then
154 -- The actual call to the back end
157 (gnat_root
=> Int
(Cunit
(Main_Unit
)),
158 max_gnat_node
=> Int
(Last_Node_Id
- First_Node_Id
+ 1),
159 number_name
=> Name_Entries_Count
,
160 node_offsets_ptr
=> Node_Offsets_Address
,
161 slots_ptr
=> Slots_Address
,
163 next_node_ptr
=> Next_Node_Address
,
164 prev_node_ptr
=> Prev_Node_Address
,
165 elists_ptr
=> Elists_Address
,
166 elmts_ptr
=> Elmts_Address
,
168 strings_ptr
=> Strings_Address
,
169 string_chars_ptr
=> String_Chars_Address
,
170 list_headers_ptr
=> Lists_Address
,
171 number_file
=> Num_Source_Files
,
173 file_info_ptr
=> File_Info_Array
'Address,
174 gigi_standard_boolean
=> Standard_Boolean
,
175 gigi_standard_integer
=> Standard_Integer
,
176 gigi_standard_character
=> Standard_Character
,
177 gigi_standard_long_long_float
=> Standard_Long_Long_Float
,
178 gigi_standard_exception_type
=> Standard_Exception_Type
,
179 gigi_operating_mode
=> Mode
);
182 -------------------------------
183 -- Gen_Or_Update_Object_File --
184 -------------------------------
186 procedure Gen_Or_Update_Object_File
is
189 end Gen_Or_Update_Object_File
;
195 function Len_Arg
(Arg
: Pos
) return Nat
is
197 for J
in 1 .. Nat
'Last loop
198 if save_argv
(Arg
).all (Natural (J
)) = ASCII
.NUL
then
206 -----------------------------
207 -- Scan_Compiler_Arguments --
208 -----------------------------
210 procedure Scan_Compiler_Arguments
is
212 -- Next argument to be scanned
214 Arg_Count
: constant Natural := Natural (save_argc
- 1);
215 Args
: Argument_List
(1 .. Arg_Count
);
217 Output_File_Name_Seen
: Boolean := False;
218 -- Set to True after having scanned file_name for switch "-gnatO file"
220 procedure Scan_Back_End_Switches
(Switch_Chars
: String);
221 -- Procedure to scan out switches stored in Switch_Chars. The first
222 -- character is known to be a valid switch character, and there are no
223 -- blanks or other switch terminator characters in the string, so the
224 -- entire string should consist of valid switch characters, except that
225 -- an optional terminating NUL character is allowed.
227 -- Back end switches have already been checked and processed by GCC in
228 -- toplev.c, so no errors can occur and control will always return. The
229 -- switches must still be scanned to skip "-o" or internal GCC switches
230 -- with their argument.
232 ----------------------------
233 -- Scan_Back_End_Switches --
234 ----------------------------
236 procedure Scan_Back_End_Switches
(Switch_Chars
: String) is
237 First
: constant Positive := Switch_Chars
'First + 1;
238 Last
: constant Natural := Switch_Last
(Switch_Chars
);
241 -- Skip -o or internal GCC switches together with their argument
243 if Switch_Chars
(First
.. Last
) = "o"
244 or else Is_Internal_GCC_Switch
(Switch_Chars
)
246 Next_Arg
:= Next_Arg
+ 1;
248 -- Store -G xxx as -Gxxx and go directly to the next argument
250 elsif Switch_Chars
(First
.. Last
) = "G" then
251 Next_Arg
:= Next_Arg
+ 1;
253 -- Should never get there with -G not followed by an argument,
254 -- but use defensive code nonetheless. Store as -Gxxx to avoid
255 -- storing parameters in ALI files that might create confusion.
257 if Next_Arg
<= Args
'Last then
258 Store_Compilation_Switch
(Switch_Chars
& Args
(Next_Arg
).all);
261 -- Do not record -quiet switch
263 elsif Switch_Chars
(First
.. Last
) = "quiet" then
266 -- Store any other GCC switches. Also do special processing for some
267 -- specific switches that the Ada front-end knows about.
271 if not Scan_Common_Back_End_Switch
(Switch_Chars
) then
273 -- Store compilation switch, as Scan_Common_Back_End_Switch
274 -- only stores switches it recognizes.
276 Store_Compilation_Switch
(Switch_Chars
);
278 -- Back end switch -fdump-scos, which exists primarily for C,
279 -- is also accepted for Ada as a synonym of -gnateS.
281 if Switch_Chars
(First
.. Last
) = "fdump-scos" then
282 Opt
.Generate_SCO
:= True;
283 Opt
.Generate_SCO_Instance_Table
:= True;
287 end Scan_Back_End_Switches
;
289 -- Start of processing for Scan_Compiler_Arguments
292 -- Acquire stack checking mode directly from GCC. The reason we do this
293 -- is to make sure that the indication of stack checking being enabled
294 -- is the same in the front end and the back end. This status obtained
295 -- from gcc is affected by more than just the switch -fstack-check.
297 Opt
.Stack_Checking_Enabled
:= (flag_stack_check
/= 0);
299 -- Put the arguments in Args
301 for Arg
in Pos
range 1 .. save_argc
- 1 loop
303 Argv_Ptr
: constant Big_String_Ptr
:= save_argv
(Arg
);
304 Argv_Len
: constant Nat
:= Len_Arg
(Arg
);
305 Argv
: constant String :=
306 Argv_Ptr
(1 .. Natural (Argv_Len
));
308 Args
(Positive (Arg
)) := new String'(Argv);
312 -- Loop through command line arguments, storing them for later access
315 while Next_Arg <= Args'Last loop
316 Look_At_Arg : declare
317 Argv : constant String := Args (Next_Arg).all;
320 -- If the previous switch has set the Output_File_Name_Present
321 -- flag (that is we have seen a -gnatO), then the next argument
322 -- is the name of the output object file.
324 if Output_File_Name_Present and then not Output_File_Name_Seen then
325 if Is_Switch (Argv) then
326 Fail ("Object file name missing after -gnatO");
328 Set_Output_Object_File_Name (Argv);
329 Output_File_Name_Seen := True;
332 -- If the previous switch has set the Search_Directory_Present
333 -- flag (that is if we have just seen -I), then the next argument
334 -- is a search directory path.
336 elsif Search_Directory_Present then
337 if Is_Switch (Argv) then
338 Fail ("search directory missing after -I");
340 Add_Src_Search_Dir (Argv);
341 Search_Directory_Present := False;
344 -- If not a switch, must be a file name
346 elsif not Is_Switch (Argv) then
349 -- We must recognize -nostdinc to suppress visibility on the
350 -- standard GNAT RTL sources. This is also a gcc switch.
352 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
353 Opt.No_Stdinc := True;
354 Scan_Back_End_Switches (Argv);
356 -- We must recognize -nostdlib to suppress visibility on the
357 -- standard GNAT RTL objects.
359 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
360 Opt.No_Stdlib := True;
362 elsif Is_Front_End_Switch (Argv) then
363 Scan_Front_End_Switches (Argv, Args, Next_Arg);
365 -- All non-front-end switches are back-end switches
368 Scan_Back_End_Switches (Argv);
372 Next_Arg := Next_Arg + 1;
374 end Scan_Compiler_Arguments;