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) 1992-2019, 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 26with Debug; use Debug; 27with Opt; use Opt; 28with Output; use Output; 29with System; use System; 30 31pragma Warnings (Off); 32-- This package is used also by gnatcoll 33with System.OS_Lib; use System.OS_Lib; 34pragma Warnings (On); 35 36package 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 Debug_Flag_L then 69 Write_Str ("Sinput.C.Load_File: created source "); 70 Write_Int (Int (X)); 71 Write_Str (" for "); 72 Write_Str (Path); 73 Write_Line (""); 74 end if; 75 76 if X = Source_File.First then 77 Lo := First_Source_Ptr; 78 else 79 Lo := ((Source_File.Table (X - 1).Source_Last + Source_Align) / 80 Source_Align) * Source_Align; 81 end if; 82 83 Name_Len := Path'Length; 84 Name_Buffer (1 .. Name_Len) := Path; 85 Path_Id := Name_Find; 86 Name_Buffer (Name_Len + 1) := ASCII.NUL; 87 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. 92 93 Source_File_FD := Open_Read (Name_Buffer'Address, Binary); 94 95 if Source_File_FD = Invalid_FD then 96 Source_File.Decrement_Last; 97 return No_Source_File; 98 99 end if; 100 101 Len := Integer (File_Length (Source_File_FD)); 102 103 -- 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 105 106 Hi := Lo + Source_Ptr (Len); 107 108 -- Do the actual read operation 109 110 declare 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 114 115 begin 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 118 -- characters. 119 120 Hi := Lo; 121 loop 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; 125 end loop; 126 127 Var_Ptr (Hi) := EOF; 128 Src := Var_Ptr.all'Access; 129 end; 130 131 -- 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). 133 134 Close (Source_File_FD); 135 136 -- Get the file name, without path information 137 138 declare 139 Index : Positive := Path'Last; 140 141 begin 142 while Index > Path'First loop 143 exit when Path (Index - 1) = '/'; 144 exit when Path (Index - 1) = Directory_Separator; 145 Index := Index - 1; 146 end loop; 147 148 Name_Len := Path'Last - Index + 1; 149 Name_Buffer (1 .. Name_Len) := Path (Index .. Path'Last); 150 File_Id := Name_Find; 151 end; 152 153 declare 154 S : Source_File_Record renames Source_File.Table (X); 155 156 begin 157 S := (Debug_Source_Name => File_Id, 158 File_Name => File_Id, 159 File_Type => Config, 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, 171 License => Unknown, 172 Lines_Table => null, 173 Lines_Table_Max => 1, 174 Logical_Lines_Table => null, 175 Num_SRef_Pragmas => 0, 176 Reference_Name => File_Id, 177 Sloc_Adjust => 0, 178 Source_Checksum => 0, 179 Source_First => Lo, 180 Source_Last => Hi, 181 Source_Text => Src, 182 Template => No_Source_File, 183 Unit => No_Unit, 184 Time_Stamp => Empty_Time_Stamp, 185 Index => X); 186 187 Alloc_Line_Tables (S, Opt.Table_Factor * Alloc.Lines_Initial); 188 S.Lines_Table (1) := Lo; 189 end; 190 191 Set_Source_File_Index_Table (X); 192 return X; 193 end Load_File; 194 195end Sinput.C; 196