1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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;
30 with Osint; use Osint;
32 with Osint.C; use Osint.C;
33 with Namet; use Namet;
34 with Nlists; use Nlists;
35 with Stand; use Stand;
36 with Sinput; use Sinput;
37 with Stringt; use Stringt;
38 with Switch; use Switch;
39 with Switch.C; use Switch.C;
40 with System; use System;
41 with Types; use Types;
43 package body Back_End is
49 procedure Call_Back_End (Mode : Back_End_Mode_Type) is
51 -- The Source_File_Record type has a lot of components that are
52 -- meaningless to the back end, so a new record type is created
53 -- here to contain the needed information for each file.
55 type File_Info_Type is record
56 File_Name : File_Name_Type;
57 Num_Source_Lines : Nat;
60 File_Info_Array : array (1 .. Last_Source_File) of File_Info_Type;
68 next_node_ptr : Address;
69 prev_node_ptr : Address;
73 strings_ptr : Address;
74 string_chars_ptr : Address;
75 list_headers_ptr : Address;
78 file_info_ptr : Address;
79 gigi_standard_boolean : Entity_Id;
80 gigi_standard_integer : Entity_Id;
81 gigi_standard_long_long_float : Entity_Id;
82 gigi_standard_exception_type : Entity_Id;
83 gigi_operating_mode : Back_End_Mode_Type);
85 pragma Import (C, gigi);
88 -- Skip call if in -gnatdH mode
94 for J in 1 .. Last_Source_File loop
95 File_Info_Array (J).File_Name := Full_Debug_Name (J);
96 File_Info_Array (J).Num_Source_Lines := Num_Source_Lines (J);
100 (gnat_root => Int (Cunit (Main_Unit)),
101 max_gnat_node => Int (Last_Node_Id - First_Node_Id + 1),
102 number_name => Name_Entries_Count,
103 nodes_ptr => Nodes_Address,
105 next_node_ptr => Next_Node_Address,
106 prev_node_ptr => Prev_Node_Address,
107 elists_ptr => Elists_Address,
108 elmts_ptr => Elmts_Address,
110 strings_ptr => Strings_Address,
111 string_chars_ptr => String_Chars_Address,
112 list_headers_ptr => Lists_Address,
113 number_file => Num_Source_Files,
115 file_info_ptr => File_Info_Array'Address,
116 gigi_standard_boolean => Standard_Boolean,
117 gigi_standard_integer => Standard_Integer,
118 gigi_standard_long_long_float => Standard_Long_Long_Float,
119 gigi_standard_exception_type => Standard_Exception_Type,
120 gigi_operating_mode => Mode);
123 -----------------------------
124 -- Scan_Compiler_Arguments --
125 -----------------------------
127 procedure Scan_Compiler_Arguments is
130 type Arg_Array is array (Nat) of Big_String_Ptr;
131 type Arg_Array_Ptr is access Arg_Array;
133 flag_stack_check : Int;
134 pragma Import (C, flag_stack_check);
135 -- Import from toplev.c
138 pragma Import (C, save_argc);
139 -- Import from toplev.c
141 save_argv : Arg_Array_Ptr;
142 pragma Import (C, save_argv);
143 -- Import from toplev.c
145 Output_File_Name_Seen : Boolean := False;
146 -- Set to True after having scanned file_name for switch "-gnatO file"
150 function Len_Arg (Arg : Pos) return Nat;
151 -- Determine length of argument number Arg on the original command line
154 procedure Scan_Back_End_Switches (Switch_Chars : String);
155 -- Procedure to scan out switches stored in Switch_Chars. The first
156 -- character is known to be a valid switch character, and there are no
157 -- blanks or other switch terminator characters in the string, so the
158 -- entire string should consist of valid switch characters, except that
159 -- an optional terminating NUL character is allowed.
161 -- Back end switches have already been checked and processed by GCC
162 -- in toplev.c, so no errors can occur and control will always return.
163 -- The switches must still be scanned to skip the arguments of the
164 -- "-o" or the (undocumented) "-dumpbase" switch, by incrementing
165 -- the Next_Arg variable. The "-dumpbase" switch is used to set the
166 -- basename for GCC dumpfiles.
172 function Len_Arg (Arg : Pos) return Nat is
174 for J in 1 .. Nat'Last loop
175 if save_argv (Arg).all (Natural (J)) = ASCII.NUL then
183 ----------------------------
184 -- Scan_Back_End_Switches --
185 ----------------------------
187 procedure Scan_Back_End_Switches (Switch_Chars : String) is
188 First : constant Positive := Switch_Chars'First + 1;
189 Last : Natural := Switch_Chars'Last;
193 and then Switch_Chars (Last) = ASCII.NUL
198 -- For switches -o, -dumpbase, --param, skip following argument and
199 -- do not store either the switch or the following argument.
201 if Switch_Chars (First .. Last) = "o" or else
202 Switch_Chars (First .. Last) = "dumpbase" or else
203 Switch_Chars (First .. Last) = "-param"
205 Next_Arg := Next_Arg + 1;
207 -- Do not record -quiet switch
209 elsif Switch_Chars (First .. Last) = "quiet" then
212 -- Store any other GCC switches
215 Store_Compilation_Switch (Switch_Chars);
217 -- Special check, the back end switch -fno-inline also sets the
218 -- front end flag to entirely inhibit all inlining.
220 if Switch_Chars (First .. Last) = "fno-inline" then
221 Opt.Suppress_All_Inlining := True;
223 -- Another special check, the switch -fpreserve-control-flow
224 -- which is also a back end switch sets the front end flag
225 -- that inhibits improper control flow transformations.
227 elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then
228 Opt.Suppress_Control_Flow_Optimizations := True;
231 end Scan_Back_End_Switches;
233 -- Start of processing for Scan_Compiler_Arguments
236 -- Acquire stack checking mode directly from GCC
238 Opt.Stack_Checking_Enabled := (flag_stack_check /= 0);
240 -- Loop through command line arguments, storing them for later access
242 while Next_Arg < save_argc loop
243 Look_At_Arg : declare
244 Argv_Ptr : constant Big_String_Ptr := save_argv (Next_Arg);
245 Argv_Len : constant Nat := Len_Arg (Next_Arg);
246 Argv : constant String :=
247 Argv_Ptr (1 .. Natural (Argv_Len));
250 -- If the previous switch has set the Output_File_Name_Present
251 -- flag (that is we have seen a -gnatO), then the next argument
252 -- is the name of the output object file.
254 if Output_File_Name_Present
255 and then not Output_File_Name_Seen
257 if Is_Switch (Argv) then
258 Fail ("Object file name missing after -gnatO");
261 Set_Output_Object_File_Name (Argv);
262 Output_File_Name_Seen := True;
265 -- If the previous switch has set the Search_Directory_Present
266 -- flag (that is if we have just seen -I), then the next argument
267 -- is a search directory path.
269 elsif Search_Directory_Present then
270 if Is_Switch (Argv) then
271 Fail ("search directory missing after -I");
273 Add_Src_Search_Dir (Argv);
274 Search_Directory_Present := False;
277 elsif not Is_Switch (Argv) then -- must be a file name
280 -- We must recognize -nostdinc to suppress visibility on the
281 -- standard GNAT RTL sources. This is also a gcc switch.
283 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
284 Opt.No_Stdinc := True;
285 Scan_Back_End_Switches (Argv);
287 -- We must recognize -nostdlib to suppress visibility on the
288 -- standard GNAT RTL objects.
290 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
291 Opt.No_Stdlib := True;
293 elsif Is_Front_End_Switch (Argv) then
294 Scan_Front_End_Switches (Argv);
296 -- All non-front-end switches are back-end switches
299 Scan_Back_End_Switches (Argv);
303 Next_Arg := Next_Arg + 1;
305 end Scan_Compiler_Arguments;