gcc/ada/prj-ext.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P R J . E X T                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2007, 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 Hostparm;
  27 with Makeutl;  use Makeutl;
  28 with Output;   use Output;
  29 with Osint;    use Osint;
  30 with Sdefault;
  31 with Table;
  32
  33 with GNAT.HTable;
  34
  35 package body Prj.Ext is
  36
  37    Ada_Project_Path : constant String := "ADA_PROJECT_PATH";
  38    --  Name of alternate env. variable that contain path name(s) of directories
  39    --  where project files may reside. GPR_PROJECT_PATH has precedence over
  40    --  ADA_PROJECT_PATH.
  41
  42    Gpr_Prj_Path : constant String_Access := Getenv (Gpr_Project_Path);
  43    Ada_Prj_Path : constant String_Access := Getenv (Ada_Project_Path);
  44    --  The path name(s) of directories where project files may reside.
  45    --  May be empty.
  46
  47    No_Project_Default_Dir : constant String := "-";
  48
  49    Current_Project_Path : String_Access;
  50    --  The project path. Initialized by procedure Initialize_Project_Path
  51    --  below.
  52
  53    procedure Initialize_Project_Path;
  54    --  Initialize Current_Project_Path
  55
  56    package Htable is new GNAT.HTable.Simple_HTable
  57      (Header_Num => Header_Num,
  58       Element    => Name_Id,
  59       No_Element => No_Name,
  60       Key        => Name_Id,
  61       Hash       => Hash,
  62       Equal      => "=");
  63    --  External references are stored in this hash table, either by procedure
  64    --  Add (directly or through a call to function Check) or by function
  65    --  Value_Of when an environment variable is found non empty. Value_Of
  66    --  first for external reference in this table, before checking the
  67    --  environment. Htable is emptied (reset) by procedure Reset.
  68
  69    ---------
  70    package Search_Directories is new Table.Table
  71      (Table_Component_Type => Name_Id,
  72       Table_Index_Type     => Natural,
  73       Table_Low_Bound      => 1,
  74       Table_Initial        => 4,
  75       Table_Increment      => 100,
  76       Table_Name           => "Prj.Ext.Search_Directories");
  77    --  The table for the directories specified with -aP switches
  78
  79    -- Add --
  80    ---------
  81
  82    procedure Add
  83      (External_Name : String;
  84       Value         : String)
  85    is
  86       The_Key   : Name_Id;
  87       The_Value : Name_Id;
  88    begin
  89       Name_Len := Value'Length;
  90       Name_Buffer (1 .. Name_Len) := Value;
  91       The_Value := Name_Find;
  92       Name_Len := External_Name'Length;
  93       Name_Buffer (1 .. Name_Len) := External_Name;
  94       Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
  95       The_Key := Name_Find;
  96       Htable.Set (The_Key, The_Value);
  97    end Add;
  98
  99    -----------
 100    ----------------------------------
 101    -- Add_Search_Project_Directory --
 102    ----------------------------------
 103
 104    procedure Add_Search_Project_Directory (Path : String) is
 105    begin
 106       Name_Len := 0;
 107       Add_Str_To_Name_Buffer (Path);
 108       Search_Directories.Append (Name_Find);
 109    end Add_Search_Project_Directory;
 110
 111    -- Check --
 112    -----------
 113
 114    function Check (Declaration : String) return Boolean is
 115    begin
 116       for Equal_Pos in Declaration'Range loop
 117          if Declaration (Equal_Pos) = '=' then
 118             exit when Equal_Pos = Declaration'First;
 119             exit when Equal_Pos = Declaration'Last;
 120             Add
 121               (External_Name =>
 122                  Declaration (Declaration'First .. Equal_Pos - 1),
 123                Value =>
 124                  Declaration (Equal_Pos + 1 .. Declaration'Last));
 125             return True;
 126          end if;
 127       end loop;
 128
 129       return False;
 130    end Check;
 131
 132    -----------------------------
 133    -- Initialize_Project_Path --
 134    -----------------------------
 135
 136    procedure Initialize_Project_Path is
 137       Add_Default_Dir : Boolean := True;
 138       First           : Positive;
 139       Last            : Positive;
 140       New_Len         : Positive;
 141       New_Last        : Positive;
 142       Prj_Path        : String_Access := Gpr_Prj_Path;
 143
 144    begin
 145       if Get_Mode = Ada_Only then
 146          if Gpr_Prj_Path.all /= "" then
 147
 148             --  Warn if both environment variables are defined
 149
 150             if Ada_Prj_Path.all /= "" then
 151                Write_Line
 152                  ("Warning: ADA_PROJECT_PATH is not taken into account");
 153                Write_Line ("         when GPR_PROJECT_PATH is defined");
 154             end if;
 155
 156          else
 157             Prj_Path := Ada_Prj_Path;
 158          end if;
 159       end if;
 160
 161       --  The current directory is always first
 162
 163       Name_Len := 1;
 164       Name_Buffer (Name_Len) := '.';
 165
 166       --  If there are directories in the Search_Directories table, add them
 167
 168       for J in 1 .. Search_Directories.Last loop
 169          Name_Len := Name_Len + 1;
 170          Name_Buffer (Name_Len) := Path_Separator;
 171          Add_Str_To_Name_Buffer
 172            (Get_Name_String (Search_Directories.Table (J)));
 173       end loop;
 174
 175       --  If environment variable is defined and not empty, add its content
 176
 177       if Prj_Path.all /= "" then
 178          Name_Len := Name_Len + 1;
 179          Name_Buffer (Name_Len) := Path_Separator;
 180
 181          Add_Str_To_Name_Buffer (Prj_Path.all);
 182       end if;
 183
 184       --  Scan the directory path to see if "-" is one of the directories.
 185       --  Remove each occurence of "-" and set Add_Default_Dir to False.
 186       --  Also resolve relative paths and symbolic links.
 187
 188       First := 3;
 189       loop
 190          while First <= Name_Len
 191            and then (Name_Buffer (First) = Path_Separator)
 192          loop
 193             First := First + 1;
 194          end loop;
 195
 196          exit when First > Name_Len;
 197
 198          Last := First;
 199
 200          while Last < Name_Len
 201            and then Name_Buffer (Last + 1) /= Path_Separator
 202          loop
 203             Last := Last + 1;
 204          end loop;
 205
 206          --  If the directory is "-", set Add_Default_Dir to False and
 207          --  remove from path.
 208
 209          if Name_Buffer (First .. Last) = No_Project_Default_Dir then
 210             Add_Default_Dir := False;
 211
 212             for J in Last + 1 .. Name_Len loop
 213                Name_Buffer (J - No_Project_Default_Dir'Length - 1) :=
 214                  Name_Buffer (J);
 215             end loop;
 216
 217             Name_Len := Name_Len - No_Project_Default_Dir'Length - 1;
 218
 219             --  After removing the '-', go back one character to get the next
 220             --  directory corectly.
 221
 222             Last := Last - 1;
 223
 224          elsif not Hostparm.OpenVMS
 225            or else not Is_Absolute_Path (Name_Buffer (First .. Last))
 226          then
 227             --  On VMS, only expand relative path names, as absolute paths
 228             --  may correspond to multi-valued VMS logical names.
 229
 230             declare
 231                New_Dir : constant String :=
 232                            Normalize_Pathname (Name_Buffer (First .. Last));
 233
 234             begin
 235                --  If the absolute path was resolved and is different from
 236                --  the original, replace original with the resolved path.
 237
 238                if New_Dir /= Name_Buffer (First .. Last)
 239                  and then New_Dir'Length /= 0
 240                then
 241                   New_Len := Name_Len + New_Dir'Length - (Last - First + 1);
 242                   New_Last := First + New_Dir'Length - 1;
 243                   Name_Buffer (New_Last + 1 .. New_Len) :=
 244                     Name_Buffer (Last + 1 .. Name_Len);
 245                   Name_Buffer (First .. New_Last) := New_Dir;
 246                   Name_Len := New_Len;
 247                   Last := New_Last;
 248                end if;
 249             end;
 250          end if;
 251
 252          First := Last + 1;
 253       end loop;
 254
 255       --  Set the initial value of Current_Project_Path
 256
 257       if Add_Default_Dir then
 258          declare
 259             Prefix : String_Ptr := Sdefault.Search_Dir_Prefix;
 260          begin
 261             if Prefix = null then
 262                Prefix := new String'(Executable_Prefix_Path);
 263
 264                if Prefix.all /= "" then
 265                   if Get_Mode = Ada_Only then
 266                      Current_Project_Path :=
 267                        new String'(Name_Buffer (1 .. Name_Len) &
 268                                    Path_Separator &
 269                                    Prefix.all & Directory_Separator & "gnat");
 270
 271                   else
 272                      Current_Project_Path :=
 273                        new String'(Name_Buffer (1 .. Name_Len) &
 274                                    Path_Separator &
 275                                    Prefix.all & Directory_Separator &
 276                                    "share" & Directory_Separator & "gpr");
 277                   end if;
 278                end if;
 279
 280             else
 281                Current_Project_Path :=
 282                  new String'(Name_Buffer (1 .. Name_Len) & Path_Separator &
 283                              Prefix.all &
 284                              ".." &  Directory_Separator &
 285                              ".." & Directory_Separator &
 286                              ".." & Directory_Separator & "gnat");
 287             end if;
 288          end;
 289       end if;
 290
 291       if Current_Project_Path = null then
 292          Current_Project_Path := new String'(Name_Buffer (1 .. Name_Len));
 293       end if;
 294    end Initialize_Project_Path;
 295
 296    ------------------
 297    -- Project_Path --
 298    ------------------
 299
 300    function Project_Path return String is
 301    begin
 302       if Current_Project_Path = null then
 303          Initialize_Project_Path;
 304       end if;
 305
 306       return Current_Project_Path.all;
 307    end Project_Path;
 308
 309    -----------
 310    -- Reset --
 311    -----------
 312
 313    procedure Reset is
 314    begin
 315       Htable.Reset;
 316    end Reset;
 317
 318    ----------------------
 319    -- Set_Project_Path --
 320    ----------------------
 321
 322    procedure Set_Project_Path (New_Path : String) is
 323    begin
 324       Free (Current_Project_Path);
 325       Current_Project_Path := new String'(New_Path);
 326    end Set_Project_Path;
 327
 328    --------------
 329    -- Value_Of --
 330    --------------
 331
 332    function Value_Of
 333      (External_Name : Name_Id;
 334       With_Default  : Name_Id := No_Name)
 335       return          Name_Id
 336    is
 337       The_Value : Name_Id;
 338       Name      : String := Get_Name_String (External_Name);
 339
 340    begin
 341       Canonical_Case_File_Name (Name);
 342       Name_Len := Name'Length;
 343       Name_Buffer (1 .. Name_Len) := Name;
 344       The_Value := Htable.Get (Name_Find);
 345
 346       if The_Value /= No_Name then
 347          return The_Value;
 348       end if;
 349
 350       --  Find if it is an environment, if it is, put value in the hash table
 351
 352       declare
 353          Env_Value : String_Access := Getenv (Name);
 354
 355       begin
 356          if Env_Value /= null and then Env_Value'Length > 0 then
 357             Name_Len := Env_Value'Length;
 358             Name_Buffer (1 .. Name_Len) := Env_Value.all;
 359             The_Value := Name_Find;
 360             Htable.Set (External_Name, The_Value);
 361             Free (Env_Value);
 362             return The_Value;
 363
 364          else
 365             Free (Env_Value);
 366             return With_Default;
 367          end if;
 368       end;
 369    end Value_Of;
 370
 371 end Prj.Ext;