1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, 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
45 type Arg_Array is array (Nat) of Big_String_Ptr;
46 type Arg_Array_Ptr is access Arg_Array;
47 -- Types to access compiler arguments
49 flag_stack_check : Int;
50 pragma Import (C, flag_stack_check);
51 -- Indicates if stack checking is enabled, imported from toplev.c
54 pragma Import (C, save_argc);
55 -- Saved value of argc (number of arguments), imported from toplev.c
57 save_argv : Arg_Array_Ptr;
58 pragma Import (C, save_argv);
59 -- Saved value of argv (argument pointers), imported from toplev.c
61 function Len_Arg (Arg : Pos) return Nat;
62 -- Determine length of argument number Arg on original gnat1 command line
68 procedure Call_Back_End (Mode : Back_End_Mode_Type) is
70 -- The Source_File_Record type has a lot of components that are
71 -- meaningless to the back end, so a new record type is created
72 -- here to contain the needed information for each file.
74 type File_Info_Type is record
75 File_Name : File_Name_Type;
76 Num_Source_Lines : Nat;
79 File_Info_Array : array (1 .. Last_Source_File) of File_Info_Type;
87 next_node_ptr : Address;
88 prev_node_ptr : Address;
92 strings_ptr : Address;
93 string_chars_ptr : Address;
94 list_headers_ptr : Address;
97 file_info_ptr : Address;
98 gigi_standard_boolean : Entity_Id;
99 gigi_standard_integer : Entity_Id;
100 gigi_standard_character : Entity_Id;
101 gigi_standard_long_long_float : Entity_Id;
102 gigi_standard_exception_type : Entity_Id;
103 gigi_operating_mode : Back_End_Mode_Type);
105 pragma Import (C, gigi);
108 -- Skip call if in -gnatdH mode
110 if Debug_Flag_HH then
114 for J in 1 .. Last_Source_File loop
115 File_Info_Array (J).File_Name := Full_Debug_Name (J);
116 File_Info_Array (J).Num_Source_Lines := Num_Source_Lines (J);
120 (gnat_root => Int (Cunit (Main_Unit)),
121 max_gnat_node => Int (Last_Node_Id - First_Node_Id + 1),
122 number_name => Name_Entries_Count,
123 nodes_ptr => Nodes_Address,
125 next_node_ptr => Next_Node_Address,
126 prev_node_ptr => Prev_Node_Address,
127 elists_ptr => Elists_Address,
128 elmts_ptr => Elmts_Address,
130 strings_ptr => Strings_Address,
131 string_chars_ptr => String_Chars_Address,
132 list_headers_ptr => Lists_Address,
133 number_file => Num_Source_Files,
135 file_info_ptr => File_Info_Array'Address,
136 gigi_standard_boolean => Standard_Boolean,
137 gigi_standard_integer => Standard_Integer,
138 gigi_standard_character => Standard_Character,
139 gigi_standard_long_long_float => Standard_Long_Long_Float,
140 gigi_standard_exception_type => Standard_Exception_Type,
141 gigi_operating_mode => Mode);
148 function Len_Arg (Arg : Pos) return Nat is
150 for J in 1 .. Nat'Last loop
151 if save_argv (Arg).all (Natural (J)) = ASCII.NUL then
159 -----------------------------
160 -- Scan_Compiler_Arguments --
161 -----------------------------
163 procedure Scan_Compiler_Arguments is
166 -- Next argument to be scanned
168 Output_File_Name_Seen : Boolean := False;
169 -- Set to True after having scanned file_name for switch "-gnatO file"
171 procedure Scan_Back_End_Switches (Switch_Chars : String);
172 -- Procedure to scan out switches stored in Switch_Chars. The first
173 -- character is known to be a valid switch character, and there are no
174 -- blanks or other switch terminator characters in the string, so the
175 -- entire string should consist of valid switch characters, except that
176 -- an optional terminating NUL character is allowed.
178 -- Back end switches have already been checked and processed by GCC in
179 -- toplev.c, so no errors can occur and control will always return. The
180 -- switches must still be scanned to skip "-o" or internal GCC switches
181 -- with their argument.
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 : constant Natural := Switch_Last (Switch_Chars);
192 -- Skip -o or internal GCC switches together with their argument
194 if Switch_Chars (First .. Last) = "o"
195 or else Is_Internal_GCC_Switch (Switch_Chars)
197 Next_Arg := Next_Arg + 1;
199 -- Do not record -quiet switch
201 elsif Switch_Chars (First .. Last) = "quiet" then
204 -- Store any other GCC switches
207 Store_Compilation_Switch (Switch_Chars);
209 -- Special check, the back end switch -fno-inline also sets the
210 -- front end flag to entirely inhibit all inlining.
212 if Switch_Chars (First .. Last) = "fno-inline" then
213 Opt.Suppress_All_Inlining := True;
215 -- Another special check, the switch -fpreserve-control-flow
216 -- which is also a back end switch sets the front end flag
217 -- that inhibits improper control flow transformations.
219 elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then
220 Opt.Suppress_Control_Flow_Optimizations := True;
223 end Scan_Back_End_Switches;
225 -- Start of processing for Scan_Compiler_Arguments
228 -- Acquire stack checking mode directly from GCC
230 Opt.Stack_Checking_Enabled := (flag_stack_check /= 0);
232 -- Loop through command line arguments, storing them for later access
235 while Next_Arg < save_argc loop
236 Look_At_Arg : declare
237 Argv_Ptr : constant Big_String_Ptr := save_argv (Next_Arg);
238 Argv_Len : constant Nat := Len_Arg (Next_Arg);
239 Argv : constant String :=
240 Argv_Ptr (1 .. Natural (Argv_Len));
243 -- If the previous switch has set the Output_File_Name_Present
244 -- flag (that is we have seen a -gnatO), then the next argument
245 -- is the name of the output object file.
247 if Output_File_Name_Present
248 and then not Output_File_Name_Seen
250 if Is_Switch (Argv) then
251 Fail ("Object file name missing after -gnatO");
254 Set_Output_Object_File_Name (Argv);
255 Output_File_Name_Seen := True;
258 -- If the previous switch has set the Search_Directory_Present
259 -- flag (that is if we have just seen -I), then the next argument
260 -- is a search directory path.
262 elsif Search_Directory_Present then
263 if Is_Switch (Argv) then
264 Fail ("search directory missing after -I");
266 Add_Src_Search_Dir (Argv);
267 Search_Directory_Present := False;
270 elsif not Is_Switch (Argv) then -- must be a file name
273 -- We must recognize -nostdinc to suppress visibility on the
274 -- standard GNAT RTL sources. This is also a gcc switch.
276 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
277 Opt.No_Stdinc := True;
278 Scan_Back_End_Switches (Argv);
280 -- We must recognize -nostdlib to suppress visibility on the
281 -- standard GNAT RTL objects.
283 elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
284 Opt.No_Stdlib := True;
286 elsif Is_Front_End_Switch (Argv) then
287 Scan_Front_End_Switches (Argv, Next_Arg);
289 -- All non-front-end switches are back-end switches
292 Scan_Back_End_Switches (Argv);
296 Next_Arg := Next_Arg + 1;
298 end Scan_Compiler_Arguments;