1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Ada.Unchecked_Conversion;
29 with GNAT.OS_Lib; use GNAT.OS_Lib;
30 with Namet; use Namet;
32 with System; use System;
34 package body Sinput.C is
40 function Load_File (Path : String) return Source_File_Index is
41 Src : Source_Buffer_Ptr;
42 X : Source_File_Index;
46 Source_File_FD : File_Descriptor;
47 -- The file descriptor for the current source file. A negative value
48 -- indicates failure to open the specified source file.
51 -- Length of file. Assume no more than 2 gigabytes of source!
60 return No_Source_File;
63 Source_File.Increment_Last;
64 X := Source_File.Last;
66 if X = Source_File.First then
67 Lo := First_Source_Ptr;
69 Lo := Source_File.Table (X - 1).Source_Last + 1;
72 Name_Len := Path'Length;
73 Name_Buffer (1 .. Name_Len) := Path;
75 Name_Buffer (Name_Len + 1) := ASCII.NUL;
77 -- Open the source FD, note that we open in binary mode, because as
78 -- documented in the spec, the caller is expected to handle either
79 -- DOS or Unix mode files, and there is no point in wasting time on
80 -- text translation when it is not required.
82 Source_File_FD := Open_Read (Name_Buffer'Address, Binary);
84 if Source_File_FD = Invalid_FD then
85 Source_File.Decrement_Last;
86 return No_Source_File;
90 Len := Integer (File_Length (Source_File_FD));
92 -- Set Hi so that length is one more than the physical length,
93 -- allowing for the extra EOF character at the end of the buffer
95 Hi := Lo + Source_Ptr (Len);
97 -- Do the actual read operation
100 subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi);
101 -- Physical buffer allocated
103 type Actual_Source_Ptr is access Actual_Source_Buffer;
104 -- This is the pointer type for the physical buffer allocated
106 Actual_Ptr : Actual_Source_Ptr := new Actual_Source_Buffer;
107 -- And this is the actual physical buffer
110 -- Allocate source buffer, allowing extra character at end for EOF
112 -- Some systems (e.g. VMS) have file types that require one
113 -- read per line, so read until we get the Len bytes or until
114 -- there are no more characters.
118 Actual_Len := Read (Source_File_FD, Actual_Ptr (Hi)'Address, Len);
119 Hi := Hi + Source_Ptr (Actual_Len);
120 exit when Actual_Len = Len or Actual_Len <= 0;
123 Actual_Ptr (Hi) := EOF;
125 -- Now we need to work out the proper virtual origin pointer to
126 -- return. This is exactly Actual_Ptr (0)'Address, but we have
127 -- to be careful to suppress checks to compute this address.
130 pragma Suppress (All_Checks);
132 function To_Source_Buffer_Ptr is new
133 Ada.Unchecked_Conversion (Address, Source_Buffer_Ptr);
136 Src := To_Source_Buffer_Ptr (Actual_Ptr (0)'Address);
140 -- Read is complete, close the file and we are done (no need to test
141 -- status from close, since we have successfully read the file!)
143 Close (Source_File_FD);
145 -- Get the file name, without path information
148 Index : Positive := Path'Last;
151 while Index > Path'First loop
152 exit when Path (Index - 1) = '/';
153 exit when Path (Index - 1) = Directory_Separator;
157 Name_Len := Path'Last - Index + 1;
158 Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last);
159 File_Id := Name_Find;
163 S : Source_File_Record renames Source_File.Table (X);
166 S := (Debug_Source_Name => File_Id,
167 File_Name => File_Id,
169 First_Mapped_Line => No_Line_Number,
170 Full_Debug_Name => Path_Id,
171 Full_File_Name => Path_Id,
172 Full_Ref_Name => Path_Id,
173 Identifier_Casing => Unknown,
174 Inlined_Body => False,
175 Instantiation => No_Location,
176 Keyword_Casing => Unknown,
177 Last_Source_Line => 1,
180 Lines_Table_Max => 1,
181 Logical_Lines_Table => null,
182 Num_SRef_Pragmas => 0,
183 Reference_Name => File_Id,
185 Source_Checksum => 0,
189 Template => No_Source_File,
190 Time_Stamp => Empty_Time_Stamp);
192 Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial);
193 S.Lines_Table (1) := Lo;
196 Set_Source_File_Index_Table (X);