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) 1992-2011, 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. Also contains other
27--  back-end specific interfaces required by the front end.
28
29with Einfo; use Einfo;
30
31package Back_End is
32
33   type Back_End_Mode_Type is (
34      Generate_Object,
35      --  Full back end operation with object file generation
36
37      Declarations_Only,
38      --  Partial back end operation with no object file generation. In this
39      --  mode the only useful action performed by gigi is to process all
40      --  declarations issuing any error messages (in particular those to
41      --  do with rep clauses), and to back annotate representation info.
42
43      Skip);
44      --  Back end call is skipped (syntax only, or errors found)
45
46   pragma Convention (C, Back_End_Mode_Type);
47   for Back_End_Mode_Type use (0, 1, 2);
48
49   type C_String is array (0 .. 255) of aliased Character;
50   pragma Convention (C, C_String);
51
52   type Register_Type_Proc is access procedure
53     (C_Name    : C_String; -- Nul-terminated string with name of type
54      Digs      : Natural;  -- Nr or digits for floating point, 0 otherwise
55      Complex   : Boolean;  -- True iff type has real and imaginary parts
56      Count     : Natural;  -- Number of elements in vector, 0 otherwise
57      Float_Rep : Float_Rep_Kind; -- Representation used for fpt type
58      Precision : Positive; -- Precision of representation in bits
59      Size      : Positive; -- Size of representation in bits
60      Alignment : Natural); -- Required alignment in bits
61   pragma Convention (C, Register_Type_Proc);
62   --  Call back procedure for Register_Back_End_Types. This is to be used by
63   --  Create_Standard to create predefined types for all types supported by
64   --  the back end.
65
66   procedure Register_Back_End_Types (Call_Back : Register_Type_Proc);
67   --  Calls the Call_Back function with information for each supported type.
68
69   procedure Call_Back_End (Mode : Back_End_Mode_Type);
70   --  Call back end, i.e. make call to driver traversing the tree and
71   --  outputting code. This call is made with all tables locked.
72   --  The back end is responsible for unlocking any tables it may need
73   --  to change, and locking them again before returning.
74
75   procedure Scan_Compiler_Arguments;
76   --  Acquires command-line parameters passed to the compiler and processes
77   --  them. Calls Scan_Front_End_Switches for any front-end switches found.
78   --
79   --  The processing of arguments is private to the back end, since the way
80   --  of acquiring the arguments as well as the set of allowable back end
81   --  switches is different depending on the particular back end being used.
82   --
83   --  Any processed switches that influence the result of a compilation must
84   --  be added to the Compilation_Arguments table.
85
86   procedure Gen_Or_Update_Object_File;
87   --  Is used to generate the object file (if generated directly by gnat1), or
88   --  update it if it has already been generated by the call to Call_Back_End,
89   --  so that its timestamp is updated by the call.
90   --
91   --  This is a no-op with the gcc back-end (the object file is generated by
92   --  the assembler afterwards), but is needed for back-ends that directly
93   --  generate the final object file (such as the .NET backend) so that the
94   --  object file's timestamp is correct when compared with the corresponding
95   --  ali file by gnatmake.
96
97end Back_End;
98