File : sinput-c.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S I N P U T . C --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
10 -- --
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. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 with Opt; use Opt;
27 with System; use System;
28
29 with Ada.Unchecked_Conversion;
30
31 pragma Warnings (Off);
32 -- This package is used also by gnatcoll
33 with System.OS_Lib; use System.OS_Lib;
34 pragma Warnings (On);
35
36 package body Sinput.C is
37
38 ---------------
39 -- Load_File --
40 ---------------
41
42 function Load_File (Path : String) return Source_File_Index is
43 Src : Source_Buffer_Ptr;
44 X : Source_File_Index;
45 Lo : Source_Ptr;
46 Hi : Source_Ptr;
47
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.
51
52 Len : Integer;
53 -- Length of file (assume no more than 2 gigabytes of source)
54
55 Actual_Len : Integer;
56
57 Path_Id : File_Name_Type;
58 File_Id : File_Name_Type;
59
60 begin
61 if Path = "" then
62 return No_Source_File;
63 end if;
64
65 Source_File.Increment_Last;
66 X := Source_File.Last;
67
68 if X = Source_File.First then
69 Lo := First_Source_Ptr;
70 else
71 Lo := ((Source_File.Table (X - 1).Source_Last + Source_Align) /
72 Source_Align) * Source_Align;
73 end if;
74
75 Name_Len := Path'Length;
76 Name_Buffer (1 .. Name_Len) := Path;
77 Path_Id := Name_Find;
78 Name_Buffer (Name_Len + 1) := ASCII.NUL;
79
80 -- Open the source FD, note that we open in binary mode, because as
81 -- documented in the spec, the caller is expected to handle either
82 -- DOS or Unix mode files, and there is no point in wasting time on
83 -- text translation when it is not required.
84
85 Source_File_FD := Open_Read (Name_Buffer'Address, Binary);
86
87 if Source_File_FD = Invalid_FD then
88 Source_File.Decrement_Last;
89 return No_Source_File;
90
91 end if;
92
93 Len := Integer (File_Length (Source_File_FD));
94
95 -- Set Hi so that length is one more than the physical length, allowing
96 -- for the extra EOF character at the end of the buffer
97
98 Hi := Lo + Source_Ptr (Len);
99
100 -- Do the actual read operation
101
102 declare
103 subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi);
104 -- Physical buffer allocated
105
106 type Actual_Source_Ptr is access Actual_Source_Buffer;
107 -- This is the pointer type for the physical buffer allocated
108
109 Actual_Ptr : constant Actual_Source_Ptr := new Actual_Source_Buffer;
110 -- And this is the actual physical buffer
111
112 begin
113 -- Allocate source buffer, allowing extra character at end for EOF
114
115 -- Some systems have file types that require one read per line,
116 -- so read until we get the Len bytes or until there are no more
117 -- characters.
118
119 Hi := Lo;
120 loop
121 Actual_Len := Read (Source_File_FD, Actual_Ptr (Hi)'Address, Len);
122 Hi := Hi + Source_Ptr (Actual_Len);
123 exit when Actual_Len = Len or else Actual_Len <= 0;
124 end loop;
125
126 Actual_Ptr (Hi) := EOF;
127
128 -- Now we need to work out the proper virtual origin pointer to
129 -- return. This is exactly Actual_Ptr (0)'Address, but we have to
130 -- be careful to suppress checks to compute this address.
131
132 declare
133 pragma Suppress (All_Checks);
134
135 pragma Warnings (Off);
136 -- The following unchecked conversion is aliased safe, since it
137 -- is not used to create improperly aliased pointer values.
138
139 function To_Source_Buffer_Ptr is new
140 Ada.Unchecked_Conversion (Address, Source_Buffer_Ptr);
141
142 pragma Warnings (On);
143
144 begin
145 Src := To_Source_Buffer_Ptr (Actual_Ptr (0)'Address);
146 end;
147 end;
148
149 -- Read is complete, close the file and we are done (no need to test
150 -- status from close, since we have successfully read the file).
151
152 Close (Source_File_FD);
153
154 -- Get the file name, without path information
155
156 declare
157 Index : Positive := Path'Last;
158
159 begin
160 while Index > Path'First loop
161 exit when Path (Index - 1) = '/';
162 exit when Path (Index - 1) = Directory_Separator;
163 Index := Index - 1;
164 end loop;
165
166 Name_Len := Path'Last - Index + 1;
167 Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last);
168 File_Id := Name_Find;
169 end;
170
171 declare
172 S : Source_File_Record renames Source_File.Table (X);
173
174 begin
175 S := (Debug_Source_Name => File_Id,
176 File_Name => File_Id,
177 File_Type => Config,
178 First_Mapped_Line => No_Line_Number,
179 Full_Debug_Name => Path_Id,
180 Full_File_Name => Path_Id,
181 Full_Ref_Name => Path_Id,
182 Instance => No_Instance_Id,
183 Identifier_Casing => Unknown,
184 Inlined_Call => No_Location,
185 Inlined_Body => False,
186 Inherited_Pragma => False,
187 Keyword_Casing => Unknown,
188 Last_Source_Line => 1,
189 License => Unknown,
190 Lines_Table => null,
191 Lines_Table_Max => 1,
192 Logical_Lines_Table => null,
193 Num_SRef_Pragmas => 0,
194 Reference_Name => File_Id,
195 Sloc_Adjust => 0,
196 Source_Checksum => 0,
197 Source_First => Lo,
198 Source_Last => Hi,
199 Source_Text => Src,
200 Template => No_Source_File,
201 Unit => No_Unit,
202 Time_Stamp => Empty_Time_Stamp);
203
204 Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial);
205 S.Lines_Table (1) := Lo;
206 end;
207
208 Set_Source_File_Index_Table (X);
209 return X;
210 end Load_File;
211
212 end Sinput.C;