1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, 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 Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Elists
; use Elists
;
29 with Errout
; use Errout
;
31 with Osint
; use Osint
;
33 with Osint
.C
; use Osint
.C
;
34 with Namet
; use Namet
;
35 with Nlists
; use Nlists
;
36 with Stand
; use Stand
;
37 with Sinput
; use Sinput
;
38 with Stringt
; use Stringt
;
39 with Switch
; use Switch
;
40 with Switch
.C
; use Switch
.C
;
41 with System
; use System
;
42 with Types
; use Types
;
44 with System
.OS_Lib
; use System
.OS_Lib
;
46 package body Back_End
is
48 type Arg_Array
is array (Nat
) of Big_String_Ptr
;
49 type Arg_Array_Ptr
is access Arg_Array
;
50 -- Types to access compiler arguments
52 flag_stack_check
: Int
;
53 pragma Import
(C
, flag_stack_check
);
54 -- Indicates if stack checking is enabled, imported from decl.c
57 pragma Import
(C
, save_argc
);
58 -- Saved value of argc (number of arguments), imported from misc.c
60 save_argv
: Arg_Array_Ptr
;
61 pragma Import
(C
, save_argv
);
62 -- Saved value of argv (argument pointers), imported from misc.c
64 function Len_Arg
(Arg
: Pos
) return Nat
;
65 -- Determine length of argument number Arg on original gnat1 command line
71 procedure Call_Back_End
(Mode
: Back_End_Mode_Type
) is
73 -- The Source_File_Record type has a lot of components that are
74 -- meaningless to the back end, so a new record type is created
75 -- here to contain the needed information for each file.
77 type File_Info_Type
is record
78 File_Name
: File_Name_Type
;
79 Instance
: Instance_Id
;
80 Num_Source_Lines
: Nat
;
83 File_Info_Array
: array (1 .. Last_Source_File
) of File_Info_Type
;
91 next_node_ptr
: Address
;
92 prev_node_ptr
: Address
;
96 strings_ptr
: Address
;
97 string_chars_ptr
: Address
;
98 list_headers_ptr
: Address
;
101 file_info_ptr
: Address
;
102 gigi_standard_boolean
: Entity_Id
;
103 gigi_standard_integer
: Entity_Id
;
104 gigi_standard_character
: Entity_Id
;
105 gigi_standard_long_long_float
: Entity_Id
;
106 gigi_standard_exception_type
: Entity_Id
;
107 gigi_operating_mode
: Back_End_Mode_Type
);
109 pragma Import
(C
, gigi
);
112 -- Skip call if in -gnatdH mode
114 if Debug_Flag_HH
then
118 -- The back end needs to know the maximum line number that can appear
119 -- in a Sloc, in other words the maximum logical line number.
121 for J
in 1 .. Last_Source_File
loop
122 File_Info_Array
(J
).File_Name
:= Full_Debug_Name
(J
);
123 File_Info_Array
(J
).Instance
:= Instance
(J
);
124 File_Info_Array
(J
).Num_Source_Lines
:=
125 Nat
(Physical_To_Logical
(Last_Source_Line
(J
), J
));
128 if Generate_SCIL
then
129 Error_Msg_N
("'S'C'I'L generation not available", Cunit
(Main_Unit
));
132 or else (Mode
/= Generate_Object
133 and then not Back_Annotate_Rep_Info
)
140 (gnat_root
=> Int
(Cunit
(Main_Unit
)),
141 max_gnat_node
=> Int
(Last_Node_Id
- First_Node_Id
+ 1),
142 number_name
=> Name_Entries_Count
,
143 nodes_ptr
=> Nodes_Address
,
145 next_node_ptr
=> Next_Node_Address
,
146 prev_node_ptr
=> Prev_Node_Address
,
147 elists_ptr
=> Elists_Address
,
148 elmts_ptr
=> Elmts_Address
,
150 strings_ptr
=> Strings_Address
,
151 string_chars_ptr
=> String_Chars_Address
,
152 list_headers_ptr
=> Lists_Address
,
153 number_file
=> Num_Source_Files
,
155 file_info_ptr
=> File_Info_Array
'Address,
156 gigi_standard_boolean
=> Standard_Boolean
,
157 gigi_standard_integer
=> Standard_Integer
,
158 gigi_standard_character
=> Standard_Character
,
159 gigi_standard_long_long_float
=> Standard_Long_Long_Float
,
160 gigi_standard_exception_type
=> Standard_Exception_Type
,
161 gigi_operating_mode
=> Mode
);
168 function Len_Arg
(Arg
: Pos
) return Nat
is
170 for J
in 1 .. Nat
'Last loop
171 if save_argv
(Arg
).all (Natural (J
)) = ASCII
.NUL
then
179 -----------------------------
180 -- Scan_Compiler_Arguments --
181 -----------------------------
183 procedure Scan_Compiler_Arguments
is
186 -- Next argument to be scanned
188 Output_File_Name_Seen
: Boolean := False;
189 -- Set to True after having scanned file_name for switch "-gnatO file"
191 procedure Scan_Back_End_Switches
(Switch_Chars
: String);
192 -- Procedure to scan out switches stored in Switch_Chars. The first
193 -- character is known to be a valid switch character, and there are no
194 -- blanks or other switch terminator characters in the string, so the
195 -- entire string should consist of valid switch characters, except that
196 -- an optional terminating NUL character is allowed.
198 -- Back end switches have already been checked and processed by GCC in
199 -- toplev.c, so no errors can occur and control will always return. The
200 -- switches must still be scanned to skip "-o" or internal GCC switches
201 -- with their argument.
203 ----------------------------
204 -- Scan_Back_End_Switches --
205 ----------------------------
207 procedure Scan_Back_End_Switches
(Switch_Chars
: String) is
208 First
: constant Positive := Switch_Chars
'First + 1;
209 Last
: constant Natural := Switch_Last
(Switch_Chars
);
212 -- Skip -o or internal GCC switches together with their argument
214 if Switch_Chars
(First
.. Last
) = "o"
215 or else Is_Internal_GCC_Switch
(Switch_Chars
)
217 Next_Arg
:= Next_Arg
+ 1;
219 -- Do not record -quiet switch
221 elsif Switch_Chars
(First
.. Last
) = "quiet" then
224 -- Store any other GCC switches. Also do special processing for some
225 -- specific switches that the Ada front-end knows about.
228 Store_Compilation_Switch
(Switch_Chars
);
230 -- Back end switch -fno-inline also sets the Suppress_All_Inlining
231 -- front end flag to entirely inhibit all inlining.
233 if Switch_Chars
(First
.. Last
) = "fno-inline" then
234 Opt
.Suppress_All_Inlining
:= True;
236 -- Back end switch -fpreserve-control-flow also sets the front end
237 -- flag that inhibits improper control flow transformations.
239 elsif Switch_Chars
(First
.. Last
) = "fpreserve-control-flow" then
240 Opt
.Suppress_Control_Flow_Optimizations
:= True;
242 -- Back end switch -fdump-scos, which exists primarily for C, is
243 -- also accepted for Ada as a synonym of -gnateS.
245 elsif Switch_Chars
(First
.. Last
) = "fdump-scos" then
246 Opt
.Generate_SCO
:= True;
247 Opt
.Generate_SCO_Instance_Table
:= True;
251 end Scan_Back_End_Switches
;
255 Arg_Count
: constant Natural := Natural (save_argc
- 1);
256 Args
: Argument_List
(1 .. Arg_Count
);
258 -- Start of processing for Scan_Compiler_Arguments
261 -- Acquire stack checking mode directly from GCC
263 Opt
.Stack_Checking_Enabled
:= (flag_stack_check
/= 0);
265 -- Put the arguments in Args
267 for Arg
in Pos
range 1 .. save_argc
- 1 loop
269 Argv_Ptr
: constant Big_String_Ptr
:= save_argv
(Arg
);
270 Argv_Len
: constant Nat
:= Len_Arg
(Arg
);
271 Argv
: constant String :=
272 Argv_Ptr
(1 .. Natural (Argv_Len
));
274 Args
(Positive (Arg
)) := new String'(Argv);
278 -- Loop through command line arguments, storing them for later access
281 while Next_Arg <= Args'Last loop
282 Look_At_Arg : declare
283 Argv : constant String := Args (Next_Arg).all;
286 -- If the previous switch has set the Output_File_Name_Present
287 -- flag (that is we have seen a -gnatO), then the next argument
288 -- is the name of the output object file.
290 if Output_File_Name_Present
291 and then not Output_File_Name_Seen
293 if Is_Switch (Argv) then
294 Fail ("Object file name missing after -gnatO");
297 Set_Output_Object_File_Name (Argv);
298 Output_File_Name_Seen := True;
301 -- If the previous switch has set the Search_Directory_Present
302 -- flag (that is if we have just seen -I), then the next argument
303 -- is a search directory path.
305 elsif Search_Directory_Present then
306 if Is_Switch (Argv) then
307 Fail ("search directory missing after -I");
309 Add_Src_Search_Dir (Argv);
310 Search_Directory_Present := False;
313 elsif not Is_Switch (Argv) then -- must be a file name
316 -- We must recognize -nostdinc to suppress visibility on the
317 -- standard GNAT RTL sources. This is also a gcc switch.
319 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
320 Opt.No_Stdinc := True;
321 Scan_Back_End_Switches (Argv);
323 -- We must recognize -nostdlib to suppress visibility on the
324 -- standard GNAT RTL objects.
326 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
327 Opt.No_Stdlib := True;
329 elsif Is_Front_End_Switch (Argv) then
330 Scan_Front_End_Switches (Argv, Args, Next_Arg);
332 -- All non-front-end switches are back-end switches
335 Scan_Back_End_Switches (Argv);
339 Next_Arg := Next_Arg + 1;
341 end Scan_Compiler_Arguments;
343 -------------------------------
344 -- Gen_Or_Update_Object_File --
345 -------------------------------
347 procedure Gen_Or_Update_Object_File is
350 end Gen_Or_Update_Object_File;