------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S I N P U T . C -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2016, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Opt; use Opt; with System; use System; with Ada.Unchecked_Conversion; pragma Warnings (Off); -- This package is used also by gnatcoll with System.OS_Lib; use System.OS_Lib; pragma Warnings (On); package body Sinput.C is --------------- -- Load_File -- --------------- function Load_File (Path : String) return Source_File_Index is Src : Source_Buffer_Ptr; X : Source_File_Index; Lo : Source_Ptr; Hi : Source_Ptr; Source_File_FD : File_Descriptor; -- The file descriptor for the current source file. A negative value -- indicates failure to open the specified source file. Len : Integer; -- Length of file (assume no more than 2 gigabytes of source) Actual_Len : Integer; Path_Id : File_Name_Type; File_Id : File_Name_Type; begin if Path = "" then return No_Source_File; end if; Source_File.Increment_Last; X := Source_File.Last; if X = Source_File.First then Lo := First_Source_Ptr; else Lo := ((Source_File.Table (X - 1).Source_Last + Source_Align) / Source_Align) * Source_Align; end if; Name_Len := Path'Length; Name_Buffer (1 .. Name_Len) := Path; Path_Id := Name_Find; Name_Buffer (Name_Len + 1) := ASCII.NUL; -- Open the source FD, note that we open in binary mode, because as -- documented in the spec, the caller is expected to handle either -- DOS or Unix mode files, and there is no point in wasting time on -- text translation when it is not required. Source_File_FD := Open_Read (Name_Buffer'Address, Binary); if Source_File_FD = Invalid_FD then Source_File.Decrement_Last; return No_Source_File; end if; Len := Integer (File_Length (Source_File_FD)); -- Set Hi so that length is one more than the physical length, allowing -- for the extra EOF character at the end of the buffer Hi := Lo + Source_Ptr (Len); -- Do the actual read operation declare subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi); -- Physical buffer allocated type Actual_Source_Ptr is access Actual_Source_Buffer; -- This is the pointer type for the physical buffer allocated Actual_Ptr : constant Actual_Source_Ptr := new Actual_Source_Buffer; -- And this is the actual physical buffer begin -- Allocate source buffer, allowing extra character at end for EOF -- Some systems have file types that require one read per line, -- so read until we get the Len bytes or until there are no more -- characters. Hi := Lo; loop Actual_Len := Read (Source_File_FD, Actual_Ptr (Hi)'Address, Len); Hi := Hi + Source_Ptr (Actual_Len); exit when Actual_Len = Len or else Actual_Len <= 0; end loop; Actual_Ptr (Hi) := EOF; -- Now we need to work out the proper virtual origin pointer to -- return. This is exactly Actual_Ptr (0)'Address, but we have to -- be careful to suppress checks to compute this address. declare pragma Suppress (All_Checks); pragma Warnings (Off); -- The following unchecked conversion is aliased safe, since it -- is not used to create improperly aliased pointer values. function To_Source_Buffer_Ptr is new Ada.Unchecked_Conversion (Address, Source_Buffer_Ptr); pragma Warnings (On); begin Src := To_Source_Buffer_Ptr (Actual_Ptr (0)'Address); end; end; -- Read is complete, close the file and we are done (no need to test -- status from close, since we have successfully read the file). Close (Source_File_FD); -- Get the file name, without path information declare Index : Positive := Path'Last; begin while Index > Path'First loop exit when Path (Index - 1) = '/'; exit when Path (Index - 1) = Directory_Separator; Index := Index - 1; end loop; Name_Len := Path'Last - Index + 1; Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last); File_Id := Name_Find; end; declare S : Source_File_Record renames Source_File.Table (X); begin S := (Debug_Source_Name => File_Id, File_Name => File_Id, File_Type => Config, First_Mapped_Line => No_Line_Number, Full_Debug_Name => Path_Id, Full_File_Name => Path_Id, Full_Ref_Name => Path_Id, Instance => No_Instance_Id, Identifier_Casing => Unknown, Inlined_Call => No_Location, Inlined_Body => False, Inherited_Pragma => False, Keyword_Casing => Unknown, Last_Source_Line => 1, License => Unknown, Lines_Table => null, Lines_Table_Max => 1, Logical_Lines_Table => null, Num_SRef_Pragmas => 0, Reference_Name => File_Id, Sloc_Adjust => 0, Source_Checksum => 0, Source_First => Lo, Source_Last => Hi, Source_Text => Src, Template => No_Source_File, Unit => No_Unit, Time_Stamp => Empty_Time_Stamp); Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial); S.Lines_Table (1) := Lo; end; Set_Source_File_Index_Table (X); return X; end Load_File; end Sinput.C;