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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S I N P U T . C --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2010, 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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with Opt; use Opt;
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with System; use System;
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with Ada.Unchecked_Conversion;
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pragma Warnings (Off);
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-- This package is used also by gnatcoll
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with System.OS_Lib; use System.OS_Lib;
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pragma Warnings (On);
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package body Sinput.C is
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---------------
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-- Load_File --
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---------------
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function Load_File (Path : String) return Source_File_Index is
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Src : Source_Buffer_Ptr;
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X : Source_File_Index;
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Lo : Source_Ptr;
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Hi : Source_Ptr;
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Source_File_FD : File_Descriptor;
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-- The file descriptor for the current source file. A negative value
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-- indicates failure to open the specified source file.
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Len : Integer;
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-- Length of file. Assume no more than 2 gigabytes of source!
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Actual_Len : Integer;
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Path_Id : File_Name_Type;
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File_Id : File_Name_Type;
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begin
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if Path = "" then
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return No_Source_File;
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end if;
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Source_File.Increment_Last;
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X := Source_File.Last;
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if X = Source_File.First then
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Lo := First_Source_Ptr;
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else
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Lo := Source_File.Table (X - 1).Source_Last + 1;
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end if;
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Name_Len := Path'Length;
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Name_Buffer (1 .. Name_Len) := Path;
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Path_Id := Name_Find;
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Name_Buffer (Name_Len + 1) := ASCII.NUL;
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-- Open the source FD, note that we open in binary mode, because as
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-- documented in the spec, the caller is expected to handle either
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-- DOS or Unix mode files, and there is no point in wasting time on
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-- text translation when it is not required.
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Source_File_FD := Open_Read (Name_Buffer'Address, Binary);
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if Source_File_FD = Invalid_FD then
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Source_File.Decrement_Last;
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return No_Source_File;
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end if;
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Len := Integer (File_Length (Source_File_FD));
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-- Set Hi so that length is one more than the physical length,
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-- allowing for the extra EOF character at the end of the buffer
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Hi := Lo + Source_Ptr (Len);
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-- Do the actual read operation
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declare
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subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi);
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-- Physical buffer allocated
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type Actual_Source_Ptr is access Actual_Source_Buffer;
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-- This is the pointer type for the physical buffer allocated
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Actual_Ptr : constant Actual_Source_Ptr := new Actual_Source_Buffer;
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-- And this is the actual physical buffer
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begin
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-- Allocate source buffer, allowing extra character at end for EOF
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-- Some systems (e.g. VMS) have file types that require one
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-- read per line, so read until we get the Len bytes or until
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-- there are no more characters.
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Hi := Lo;
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loop
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Actual_Len := Read (Source_File_FD, Actual_Ptr (Hi)'Address, Len);
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Hi := Hi + Source_Ptr (Actual_Len);
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exit when Actual_Len = Len or else Actual_Len <= 0;
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end loop;
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Actual_Ptr (Hi) := EOF;
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-- Now we need to work out the proper virtual origin pointer to
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-- return. This is exactly Actual_Ptr (0)'Address, but we have
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-- to be careful to suppress checks to compute this address.
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declare
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pragma Suppress (All_Checks);
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pragma Warnings (Off);
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-- The following unchecked conversion is aliased safe, since it
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-- is not used to create improperly aliased pointer values.
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function To_Source_Buffer_Ptr is new
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Ada.Unchecked_Conversion (Address, Source_Buffer_Ptr);
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pragma Warnings (On);
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begin
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Src := To_Source_Buffer_Ptr (Actual_Ptr (0)'Address);
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end;
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end;
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-- Read is complete, close the file and we are done (no need to test
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-- status from close, since we have successfully read the file!)
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Close (Source_File_FD);
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-- Get the file name, without path information
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declare
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Index : Positive := Path'Last;
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begin
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while Index > Path'First loop
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exit when Path (Index - 1) = '/';
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exit when Path (Index - 1) = Directory_Separator;
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Index := Index - 1;
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end loop;
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Name_Len := Path'Last - Index + 1;
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Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last);
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File_Id := Name_Find;
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end;
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declare
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S : Source_File_Record renames Source_File.Table (X);
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begin
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S := (Debug_Source_Name => File_Id,
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File_Name => File_Id,
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File_Type => Config,
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First_Mapped_Line => No_Line_Number,
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Full_Debug_Name => Path_Id,
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Full_File_Name => Path_Id,
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Full_Ref_Name => Path_Id,
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Identifier_Casing => Unknown,
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Inlined_Body => False,
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Instantiation => No_Location,
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Keyword_Casing => Unknown,
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Last_Source_Line => 1,
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License => Unknown,
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Lines_Table => null,
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Lines_Table_Max => 1,
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Logical_Lines_Table => null,
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Num_SRef_Pragmas => 0,
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Reference_Name => File_Id,
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Sloc_Adjust => 0,
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Source_Checksum => 0,
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Source_First => Lo,
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Source_Last => Hi,
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Source_Text => Src,
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Template => No_Source_File,
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Unit => No_Unit,
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Time_Stamp => Empty_Time_Stamp);
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Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial);
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S.Lines_Table (1) := Lo;
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end;
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Set_Source_File_Index_Table (X);
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return X;
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end Load_File;
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end Sinput.C;
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