1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                             B A C K _ E N D                              --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, Free Software Foundation, Inc.         --
10--                                                                          --
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.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26--  Call the back end with all the information needed
27
28package Back_End is
29
30   type Back_End_Mode_Type is (
31      Generate_Object,
32      --  Full back end operation with object file generation
33
34      Declarations_Only,
35      --  Partial back end operation with no object file generation. In this
36      --  mode the only useful action performed by gigi is to process all
37      --  declarations issuing any error messages (in particular those to
38      --  do with rep clauses), and to back annotate representation info.
39
40      Skip);
41      --  Back end call is skipped (syntax only, or errors found)
42
43   pragma Convention (C, Back_End_Mode_Type);
44   for Back_End_Mode_Type use (0, 1, 2);
45
46   procedure Call_Back_End (Mode : Back_End_Mode_Type);
47   --  Call back end, i.e. make call to driver traversing the tree and
48   --  outputting code. This call is made with all tables locked. The back
49   --  end is responsible for unlocking any tables it may need to change,
50   --  and locking them again before returning.
51
52   procedure Scan_Compiler_Arguments;
53   --  Acquires command-line parameters passed to the compiler and processes
54   --  them. Calls Scan_Front_End_Switches for any front-end switches found.
55   --
56   --  The processing of arguments is private to the back end, since the way
57   --  of acquiring the arguments as well as the set of allowable back end
58   --  switches is different depending on the particular back end being used.
59   --
60   --  Any processed switches that influence the result of a compilation must
61   --  be added to the Compilation_Arguments table.
62   --
63   --  This routine is expected to set the following to True if necessary (the
64   --  default for all of these in Opt is False).
65   --
66   --    Opt.Suppress_All_Inlining
67   --    Opt.Suppress_Control_Float_Optimizations
68   --    Opt.Generate_SCO
69   --    Opt.Generate_SCO_Instance_Table
70   --    Opt.Stack_Checking_Enabled
71   --    Opt.No_Stdinc
72   --    Opt.No_Stdlib
73
74   procedure Gen_Or_Update_Object_File;
75   --  Is used to generate the object file (if generated directly by gnat1), or
76   --  update it if it has already been generated by the call to Call_Back_End,
77   --  so that its timestamp is updated by the call.
78   --
79   --  This is a no-op with the gcc back-end (the object file is generated by
80   --  the assembler afterwards), but is needed for back-ends that directly
81   --  generate the final object file (such as the .NET backend) so that the
82   --  object file's timestamp is correct when compared with the corresponding
83   --  ali file by gnatmake.
84
85end Back_End;
86