gcc/ada/back_end.ads

   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
  29 with Einfo; use Einfo;
  30
  31 package 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       Size      : Positive; -- Size of representation in bits
  59       Alignment : Natural); -- Required alignment in bits
  60    pragma Convention (C, Register_Type_Proc);
  61    --  Call back procedure for Register_Back_End_Types. This is to be used by
  62    --  Create_Standard to create predefined types for all types supported by
  63    --  the back end.
  64
  65    procedure Register_Back_End_Types (Call_Back : Register_Type_Proc);
  66    --  Calls the Call_Back function with information for each supported type.
  67
  68    procedure Call_Back_End (Mode : Back_End_Mode_Type);
  69    --  Call back end, i.e. make call to driver traversing the tree and
  70    --  outputting code. This call is made with all tables locked.
  71    --  The back end is responsible for unlocking any tables it may need
  72    --  to change, and locking them again before returning.
  73
  74    procedure Scan_Compiler_Arguments;
  75    --  Acquires command-line parameters passed to the compiler and processes
  76    --  them. Calls Scan_Front_End_Switches for any front-end switches found.
  77    --
  78    --  The processing of arguments is private to the back end, since the way
  79    --  of acquiring the arguments as well as the set of allowable back end
  80    --  switches is different depending on the particular back end being used.
  81    --
  82    --  Any processed switches that influence the result of a compilation must
  83    --  be added to the Compilation_Arguments table.
  84
  85    procedure Gen_Or_Update_Object_File;
  86    --  Is used to generate the object file (if generated directly by gnat1), or
  87    --  update it if it has already been generated by the call to Call_Back_End,
  88    --  so that its timestamp is updated by the call.
  89    --
  90    --  This is a no-op with the gcc back-end (the object file is generated by
  91    --  the assembler afterwards), but is needed for back-ends that directly
  92    --  generate the final object file (such as the .NET backend) so that the
  93    --  object file's timestamp is correct when compared with the corresponding
  94    --  ali file by gnatmake.
  95
  96 end Back_End;