390 lines
14 KiB
Ada
390 lines
14 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- B A C K _ E N D --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the version of the Back_End package for GCC back ends
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with Atree; use Atree;
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with Debug; use Debug;
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with Elists; use Elists;
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with Errout; use Errout;
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with Lib; use Lib;
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with Osint; use Osint;
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with Opt; use Opt;
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with Osint.C; use Osint.C;
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with Namet; use Namet;
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with Nlists; use Nlists;
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with Stand; use Stand;
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with Sinput; use Sinput;
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with Stringt; use Stringt;
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with Switch; use Switch;
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with Switch.C; use Switch.C;
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with System; use System;
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with Types; use Types;
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with System.OS_Lib; use System.OS_Lib;
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package body Back_End is
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type Arg_Array is array (Nat) of Big_String_Ptr;
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type Arg_Array_Ptr is access Arg_Array;
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-- Types to access compiler arguments
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flag_stack_check : Int;
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pragma Import (C, flag_stack_check);
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-- Indicates if stack checking is enabled, imported from misc.c
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save_argc : Nat;
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pragma Import (C, save_argc);
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-- Saved value of argc (number of arguments), imported from misc.c
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save_argv : Arg_Array_Ptr;
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pragma Import (C, save_argv);
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-- Saved value of argv (argument pointers), imported from misc.c
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function Len_Arg (Arg : Pos) return Nat;
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-- Determine length of argument number Arg on original gnat1 command line
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-------------------
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-- Call_Back_End --
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-------------------
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procedure Call_Back_End (Mode : Back_End_Mode_Type) is
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-- The Source_File_Record type has a lot of components that are
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-- meaningless to the back end, so a new record type is created
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-- here to contain the needed information for each file.
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type File_Info_Type is record
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File_Name : File_Name_Type;
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Instance : Instance_Id;
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Num_Source_Lines : Nat;
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end record;
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File_Info_Array : array (1 .. Last_Source_File) of File_Info_Type;
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procedure gigi
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(gnat_root : Int;
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max_gnat_node : Int;
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number_name : Nat;
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nodes_ptr : Address;
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flags_ptr : Address;
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next_node_ptr : Address;
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prev_node_ptr : Address;
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elists_ptr : Address;
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elmts_ptr : Address;
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strings_ptr : Address;
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string_chars_ptr : Address;
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list_headers_ptr : Address;
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number_file : Nat;
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file_info_ptr : Address;
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gigi_standard_boolean : Entity_Id;
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gigi_standard_integer : Entity_Id;
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gigi_standard_character : Entity_Id;
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gigi_standard_long_long_float : Entity_Id;
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gigi_standard_exception_type : Entity_Id;
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gigi_operating_mode : Back_End_Mode_Type);
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pragma Import (C, gigi);
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begin
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-- Skip call if in -gnatdH mode
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if Debug_Flag_HH then
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return;
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end if;
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-- The back end needs to know the maximum line number that can appear
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-- in a Sloc, in other words the maximum logical line number.
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for J in 1 .. Last_Source_File loop
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File_Info_Array (J).File_Name := Full_Debug_Name (J);
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File_Info_Array (J).Instance := Instance (J);
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File_Info_Array (J).Num_Source_Lines :=
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Nat (Physical_To_Logical (Last_Source_Line (J), J));
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end loop;
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-- Deal with case of generating SCIL, we should not be here unless
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-- debugging CodePeer mode in GNAT.
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if Generate_SCIL then
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Error_Msg_N ("'S'C'I'L generation not available", Cunit (Main_Unit));
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if CodePeer_Mode
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or else (Mode /= Generate_Object
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and then not Back_Annotate_Rep_Info)
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then
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return;
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end if;
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end if;
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-- We should be here in GNATprove mode only when debugging GNAT. Do not
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-- call gigi in that case, as it is not prepared to handle the special
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-- form of the tree obtained in GNATprove mode.
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if GNATprove_Mode then
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return;
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end if;
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-- The actual call to the back end
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gigi
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(gnat_root => Int (Cunit (Main_Unit)),
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max_gnat_node => Int (Last_Node_Id - First_Node_Id + 1),
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number_name => Name_Entries_Count,
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nodes_ptr => Nodes_Address,
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flags_ptr => Flags_Address,
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next_node_ptr => Next_Node_Address,
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prev_node_ptr => Prev_Node_Address,
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elists_ptr => Elists_Address,
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elmts_ptr => Elmts_Address,
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strings_ptr => Strings_Address,
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string_chars_ptr => String_Chars_Address,
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list_headers_ptr => Lists_Address,
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number_file => Num_Source_Files,
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file_info_ptr => File_Info_Array'Address,
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gigi_standard_boolean => Standard_Boolean,
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gigi_standard_integer => Standard_Integer,
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gigi_standard_character => Standard_Character,
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gigi_standard_long_long_float => Standard_Long_Long_Float,
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gigi_standard_exception_type => Standard_Exception_Type,
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gigi_operating_mode => Mode);
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end Call_Back_End;
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-------------------------------
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-- Gen_Or_Update_Object_File --
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-------------------------------
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procedure Gen_Or_Update_Object_File is
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begin
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null;
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end Gen_Or_Update_Object_File;
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-------------
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-- Len_Arg --
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-------------
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function Len_Arg (Arg : Pos) return Nat is
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begin
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for J in 1 .. Nat'Last loop
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if save_argv (Arg).all (Natural (J)) = ASCII.NUL then
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return J - 1;
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end if;
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end loop;
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raise Program_Error;
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end Len_Arg;
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-----------------------------
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-- Scan_Compiler_Arguments --
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-----------------------------
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procedure Scan_Compiler_Arguments is
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Next_Arg : Positive;
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-- Next argument to be scanned
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Output_File_Name_Seen : Boolean := False;
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-- Set to True after having scanned file_name for switch "-gnatO file"
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procedure Scan_Back_End_Switches (Switch_Chars : String);
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-- Procedure to scan out switches stored in Switch_Chars. The first
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-- character is known to be a valid switch character, and there are no
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-- blanks or other switch terminator characters in the string, so the
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-- entire string should consist of valid switch characters, except that
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-- an optional terminating NUL character is allowed.
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--
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-- Back end switches have already been checked and processed by GCC in
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-- toplev.c, so no errors can occur and control will always return. The
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-- switches must still be scanned to skip "-o" or internal GCC switches
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-- with their argument.
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----------------------------
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-- Scan_Back_End_Switches --
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----------------------------
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procedure Scan_Back_End_Switches (Switch_Chars : String) is
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First : constant Positive := Switch_Chars'First + 1;
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Last : constant Natural := Switch_Last (Switch_Chars);
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begin
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-- Skip -o, -G or internal GCC switches together with their argument.
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if Switch_Chars (First .. Last) = "o"
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or else Switch_Chars (First .. Last) = "G"
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or else Is_Internal_GCC_Switch (Switch_Chars)
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then
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Next_Arg := Next_Arg + 1;
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-- Do not record -quiet switch
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elsif Switch_Chars (First .. Last) = "quiet" then
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null;
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-- Store any other GCC switches. Also do special processing for some
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-- specific switches that the Ada front-end knows about.
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else
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Store_Compilation_Switch (Switch_Chars);
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-- For gcc back ends, -fno-inline disables Inline pragmas only,
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-- not Inline_Always to remain consistent with the always_inline
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-- attribute behavior.
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if Switch_Chars (First .. Last) = "fno-inline" then
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Opt.Disable_FE_Inline := True;
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-- Back end switch -fpreserve-control-flow also sets the front end
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-- flag that inhibits improper control flow transformations.
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elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then
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Opt.Suppress_Control_Flow_Optimizations := True;
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-- Back end switch -fdump-scos, which exists primarily for C, is
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-- also accepted for Ada as a synonym of -gnateS.
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elsif Switch_Chars (First .. Last) = "fdump-scos" then
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Opt.Generate_SCO := True;
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Opt.Generate_SCO_Instance_Table := True;
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elsif Switch_Chars (First) = 'g' then
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Debugger_Level := 2;
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if First < Last then
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case Switch_Chars (First + 1) is
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when '0' =>
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Debugger_Level := 0;
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when '1' =>
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Debugger_Level := 1;
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when '2' =>
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Debugger_Level := 2;
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when '3' =>
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Debugger_Level := 3;
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when others =>
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null;
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end case;
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end if;
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end if;
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end if;
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end Scan_Back_End_Switches;
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-- Local variables
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Arg_Count : constant Natural := Natural (save_argc - 1);
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Args : Argument_List (1 .. Arg_Count);
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-- Start of processing for Scan_Compiler_Arguments
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begin
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-- Acquire stack checking mode directly from GCC. The reason we do this
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-- is to make sure that the indication of stack checking being enabled
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-- is the same in the front end and the back end. This status obtained
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-- from gcc is affected by more than just the switch -fstack-check.
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Opt.Stack_Checking_Enabled := (flag_stack_check /= 0);
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-- Put the arguments in Args
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for Arg in Pos range 1 .. save_argc - 1 loop
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declare
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Argv_Ptr : constant Big_String_Ptr := save_argv (Arg);
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Argv_Len : constant Nat := Len_Arg (Arg);
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Argv : constant String :=
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Argv_Ptr (1 .. Natural (Argv_Len));
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begin
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Args (Positive (Arg)) := new String'(Argv);
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end;
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end loop;
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-- Loop through command line arguments, storing them for later access
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Next_Arg := 1;
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while Next_Arg <= Args'Last loop
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Look_At_Arg : declare
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Argv : constant String := Args (Next_Arg).all;
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begin
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-- If the previous switch has set the Output_File_Name_Present
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-- flag (that is we have seen a -gnatO), then the next argument
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-- is the name of the output object file.
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if Output_File_Name_Present and then not Output_File_Name_Seen then
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if Is_Switch (Argv) then
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Fail ("Object file name missing after -gnatO");
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else
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Set_Output_Object_File_Name (Argv);
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Output_File_Name_Seen := True;
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end if;
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-- If the previous switch has set the Search_Directory_Present
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-- flag (that is if we have just seen -I), then the next argument
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-- is a search directory path.
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elsif Search_Directory_Present then
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if Is_Switch (Argv) then
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Fail ("search directory missing after -I");
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else
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Add_Src_Search_Dir (Argv);
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Search_Directory_Present := False;
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end if;
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-- If not a switch, must be a file name
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elsif not Is_Switch (Argv) then
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Add_File (Argv);
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-- We must recognize -nostdinc to suppress visibility on the
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-- standard GNAT RTL sources. This is also a gcc switch.
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elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then
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Opt.No_Stdinc := True;
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Scan_Back_End_Switches (Argv);
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-- We must recognize -nostdlib to suppress visibility on the
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-- standard GNAT RTL objects.
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elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then
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Opt.No_Stdlib := True;
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elsif Is_Front_End_Switch (Argv) then
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Scan_Front_End_Switches (Argv, Args, Next_Arg);
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-- All non-front-end switches are back-end switches
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else
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Scan_Back_End_Switches (Argv);
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end if;
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end Look_At_Arg;
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Next_Arg := Next_Arg + 1;
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end loop;
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end Scan_Compiler_Arguments;
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end Back_End;
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