1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2001 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.P is
36 First : Boolean := True;
37 -- Flag used when Load_Project_File is called the first time,
38 -- to set Main_Source_File.
39 -- The flag is reset to False at the first call to Load_Project_File
41 -----------------------
42 -- Load_Project_File --
43 -----------------------
45 function Load_Project_File (Path : String) return Source_File_Index is
46 Src : Source_Buffer_Ptr;
47 X : Source_File_Index;
51 Source_File_FD : File_Descriptor;
52 -- The file descriptor for the current source file. A negative value
53 -- indicates failure to open the specified source file.
56 -- Length of file. Assume no more than 2 gigabytes of source!
65 return No_Source_File;
68 Source_File.Increment_Last;
69 X := Source_File.Last;
72 Main_Source_File := X;
76 if X = Source_File.First then
77 Lo := First_Source_Ptr;
79 Lo := Source_File.Table (X - 1).Source_Last + 1;
82 Name_Len := Path'Length;
83 Name_Buffer (1 .. Name_Len) := Path;
85 Name_Buffer (Name_Len + 1) := ASCII.NUL;
87 -- Open the source FD, note that we open in binary mode, because as
88 -- documented in the spec, the caller is expected to handle either
89 -- DOS or Unix mode files, and there is no point in wasting time on
90 -- text translation when it is not required.
92 Source_File_FD := Open_Read (Name_Buffer'Address, Binary);
94 if Source_File_FD = Invalid_FD then
95 Source_File.Decrement_Last;
96 return No_Source_File;
100 Len := Integer (File_Length (Source_File_FD));
102 -- Set Hi so that length is one more than the physical length,
103 -- allowing for the extra EOF character at the end of the buffer
105 Hi := Lo + Source_Ptr (Len);
107 -- Do the actual read operation
110 subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi);
111 -- Physical buffer allocated
113 type Actual_Source_Ptr is access Actual_Source_Buffer;
114 -- This is the pointer type for the physical buffer allocated
116 Actual_Ptr : Actual_Source_Ptr := new Actual_Source_Buffer;
117 -- And this is the actual physical buffer
120 -- Allocate source buffer, allowing extra character at end for EOF
122 -- Some systems (e.g. VMS) have file types that require one
123 -- read per line, so read until we get the Len bytes or until
124 -- there are no more characters.
128 Actual_Len := Read (Source_File_FD, Actual_Ptr (Hi)'Address, Len);
129 Hi := Hi + Source_Ptr (Actual_Len);
130 exit when Actual_Len = Len or Actual_Len <= 0;
133 Actual_Ptr (Hi) := EOF;
135 -- Now we need to work out the proper virtual origin pointer to
136 -- return. This is exactly Actual_Ptr (0)'Address, but we have
137 -- to be careful to suppress checks to compute this address.
140 pragma Suppress (All_Checks);
142 function To_Source_Buffer_Ptr is new
143 Ada.Unchecked_Conversion (Address, Source_Buffer_Ptr);
146 Src := To_Source_Buffer_Ptr (Actual_Ptr (0)'Address);
150 -- Read is complete, get time stamp and close file and we are done
152 Close (Source_File_FD);
154 -- Get the file name, without path information
157 Index : Positive := Path'Last;
160 while Index > Path'First loop
161 exit when Path (Index - 1) = '/';
162 exit when Path (Index - 1) = Directory_Separator;
166 Name_Len := Path'Last - Index + 1;
167 Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last);
168 File_Id := Name_Find;
172 S : Source_File_Record renames Source_File.Table (X);
175 S := (Debug_Source_Name => Path_Id,
176 File_Name => File_Id,
177 First_Mapped_Line => No_Line_Number,
178 Full_File_Name => Path_Id,
179 Full_Ref_Name => Path_Id,
180 Identifier_Casing => Unknown,
181 Instantiation => No_Location,
182 Keyword_Casing => Unknown,
183 Last_Source_Line => 1,
186 Lines_Table_Max => 1,
187 Logical_Lines_Table => null,
188 Num_SRef_Pragmas => 0,
189 Reference_Name => File_Id,
191 Source_Checksum => 0,
195 Template => No_Source_File,
196 Time_Stamp => Empty_Time_Stamp);
198 Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial);
199 S.Lines_Table (1) := Lo;
203 end Load_Project_File;
205 --------------------------------
206 -- Restore_Project_Scan_State --
207 --------------------------------
209 procedure Restore_Project_Scan_State
210 (Saved_State : in Saved_Project_Scan_State)
213 Restore_Scan_State (Saved_State.Scan_State);
214 Source := Saved_State.Source;
215 Current_Source_File := Saved_State.Current_Source_File;
216 end Restore_Project_Scan_State;
218 -----------------------------
219 -- Save_Project_Scan_State --
220 -----------------------------
222 procedure Save_Project_Scan_State
223 (Saved_State : out Saved_Project_Scan_State)
226 Save_Scan_State (Saved_State.Scan_State);
227 Saved_State.Source := Source;
228 Saved_State.Current_Source_File := Current_Source_File;
229 end Save_Project_Scan_State;