1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2019, 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 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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Debug; use Debug;
28 with Output; use Output;
29 with System; use System;
31 pragma Warnings (Off);
32 -- This package is used also by gnatcoll
33 with System.OS_Lib; use System.OS_Lib;
36 package body Sinput.C is
42 function Load_File (Path : String) return Source_File_Index is
43 Src : Source_Buffer_Ptr;
44 X : Source_File_Index;
48 Source_File_FD : File_Descriptor;
49 -- The file descriptor for the current source file. A negative value
50 -- indicates failure to open the specified source file.
53 -- Length of file (assume no more than 2 gigabytes of source)
57 Path_Id : File_Name_Type;
58 File_Id : File_Name_Type;
62 return No_Source_File;
65 Source_File.Increment_Last;
66 X := Source_File.Last;
69 Write_Str ("Sinput.C.Load_File: created source ");
76 if X = Source_File.First then
77 Lo := First_Source_Ptr;
79 Lo := ((Source_File.Table (X - 1).Source_Last + Source_Align) /
80 Source_Align) * Source_Align;
83 Name_Len := Path'Length;
84 Name_Buffer (1 .. Name_Len) := Path;
86 Name_Buffer (Name_Len + 1) := ASCII.NUL;
88 -- Open the source FD, note that we open in binary mode, because as
89 -- documented in the spec, the caller is expected to handle either
90 -- DOS or Unix mode files, and there is no point in wasting time on
91 -- text translation when it is not required.
93 Source_File_FD := Open_Read (Name_Buffer'Address, Binary);
95 if Source_File_FD = Invalid_FD then
96 Source_File.Decrement_Last;
97 return No_Source_File;
101 Len := Integer (File_Length (Source_File_FD));
103 -- Set Hi so that length is one more than the physical length, allowing
104 -- for the extra EOF character at the end of the buffer
106 Hi := Lo + Source_Ptr (Len);
108 -- Do the actual read operation
111 Var_Ptr : constant Source_Buffer_Ptr_Var :=
112 new Source_Buffer (Lo .. Hi);
113 -- Allocate source buffer, allowing extra character at end for EOF
116 -- Some systems have file types that require one read per line,
117 -- so read until we get the Len bytes or until there are no more
122 Actual_Len := Read (Source_File_FD, Var_Ptr (Hi)'Address, Len);
123 Hi := Hi + Source_Ptr (Actual_Len);
124 exit when Actual_Len = Len or else Actual_Len <= 0;
128 Src := Var_Ptr.all'Access;
131 -- Read is complete, close the file and we are done (no need to test
132 -- status from close, since we have successfully read the file).
134 Close (Source_File_FD);
136 -- Get the file name, without path information
139 Index : Positive := Path'Last;
142 while Index > Path'First loop
143 exit when Path (Index - 1) = '/';
144 exit when Path (Index - 1) = Directory_Separator;
148 Name_Len := Path'Last - Index + 1;
149 Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last);
150 File_Id := Name_Find;
154 S : Source_File_Record renames Source_File.Table (X);
157 S := (Debug_Source_Name => File_Id,
158 File_Name => File_Id,
160 First_Mapped_Line => No_Line_Number,
161 Full_Debug_Name => Path_Id,
162 Full_File_Name => Path_Id,
163 Full_Ref_Name => Path_Id,
164 Instance => No_Instance_Id,
165 Identifier_Casing => Unknown,
166 Inlined_Call => No_Location,
167 Inlined_Body => False,
168 Inherited_Pragma => False,
169 Keyword_Casing => Unknown,
170 Last_Source_Line => 1,
173 Lines_Table_Max => 1,
174 Logical_Lines_Table => null,
175 Num_SRef_Pragmas => 0,
176 Reference_Name => File_Id,
178 Source_Checksum => 0,
182 Template => No_Source_File,
184 Time_Stamp => Empty_Time_Stamp,
187 Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial);
188 S.Lines_Table (1) := Lo;
191 Set_Source_File_Index_Table (X);