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) 2000-2008, 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    package Search_Directories is new Table.Table
  70      (Table_Component_Type => Name_Id,
  71       Table_Index_Type     => Natural,
  72       Table_Low_Bound      => 1,
  73       Table_Initial        => 4,
  74       Table_Increment      => 100,
  75       Table_Name           => "Prj.Ext.Search_Directories");
  76    --  The table for the directories specified with -aP switches
  77
  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 Gpr_Prj_Path.all /= "" then
 146
 147          --  In Ada only mode, warn if both environment variables are defined
 148
 149          if Get_Mode = Ada_Only and then Ada_Prj_Path.all /= "" then
 150             Write_Line
 151               ("Warning: ADA_PROJECT_PATH is not taken into account");
 152             Write_Line ("         when GPR_PROJECT_PATH is defined");
 153          end if;
 154
 155       else
 156          Prj_Path := Ada_Prj_Path;
 157       end if;
 158
 159       --  The current directory is always first
 160
 161       Name_Len := 1;
 162       Name_Buffer (Name_Len) := '.';
 163
 164       --  If there are directories in the Search_Directories table, add them
 165
 166       for J in 1 .. Search_Directories.Last loop
 167          Name_Len := Name_Len + 1;
 168          Name_Buffer (Name_Len) := Path_Separator;
 169          Add_Str_To_Name_Buffer
 170            (Get_Name_String (Search_Directories.Table (J)));
 171       end loop;
 172
 173       --  If environment variable is defined and not empty, add its content
 174
 175       if Prj_Path.all /= "" then
 176          Name_Len := Name_Len + 1;
 177          Name_Buffer (Name_Len) := Path_Separator;
 178
 179          Add_Str_To_Name_Buffer (Prj_Path.all);
 180       end if;
 181
 182       --  Scan the directory path to see if "-" is one of the directories.
 183       --  Remove each occurrence of "-" and set Add_Default_Dir to False.
 184       --  Also resolve relative paths and symbolic links.
 185
 186       First := 3;
 187       loop
 188          while First <= Name_Len
 189            and then (Name_Buffer (First) = Path_Separator)
 190          loop
 191             First := First + 1;
 192          end loop;
 193
 194          exit when First > Name_Len;
 195
 196          Last := First;
 197
 198          while Last < Name_Len
 199            and then Name_Buffer (Last + 1) /= Path_Separator
 200          loop
 201             Last := Last + 1;
 202          end loop;
 203
 204          --  If the directory is "-", set Add_Default_Dir to False and
 205          --  remove from path.
 206
 207          if Name_Buffer (First .. Last) = No_Project_Default_Dir then
 208             Add_Default_Dir := False;
 209
 210             for J in Last + 1 .. Name_Len loop
 211                Name_Buffer (J - No_Project_Default_Dir'Length - 1) :=
 212                  Name_Buffer (J);
 213             end loop;
 214
 215             Name_Len := Name_Len - No_Project_Default_Dir'Length - 1;
 216
 217             --  After removing the '-', go back one character to get the next
 218             --  directory correctly.
 219
 220             Last := Last - 1;
 221
 222          elsif not Hostparm.OpenVMS
 223            or else not Is_Absolute_Path (Name_Buffer (First .. Last))
 224          then
 225             --  On VMS, only expand relative path names, as absolute paths
 226             --  may correspond to multi-valued VMS logical names.
 227
 228             declare
 229                New_Dir : constant String :=
 230                            Normalize_Pathname (Name_Buffer (First .. Last));
 231
 232             begin
 233                --  If the absolute path was resolved and is different from
 234                --  the original, replace original with the resolved path.
 235
 236                if New_Dir /= Name_Buffer (First .. Last)
 237                  and then New_Dir'Length /= 0
 238                then
 239                   New_Len := Name_Len + New_Dir'Length - (Last - First + 1);
 240                   New_Last := First + New_Dir'Length - 1;
 241                   Name_Buffer (New_Last + 1 .. New_Len) :=
 242                     Name_Buffer (Last + 1 .. Name_Len);
 243                   Name_Buffer (First .. New_Last) := New_Dir;
 244                   Name_Len := New_Len;
 245                   Last := New_Last;
 246                end if;
 247             end;
 248          end if;
 249
 250          First := Last + 1;
 251       end loop;
 252
 253       --  Set the initial value of Current_Project_Path
 254
 255       if Add_Default_Dir then
 256          declare
 257             Prefix : String_Ptr := Sdefault.Search_Dir_Prefix;
 258          begin
 259             if Prefix = null then
 260                Prefix := new String'(Executable_Prefix_Path);
 261
 262                if Prefix.all /= "" then
 263                   if Get_Mode = Multi_Language then
 264                      Add_Str_To_Name_Buffer
 265                        (Path_Separator & Prefix.all &
 266                         Directory_Separator & "share" &
 267                         Directory_Separator & "gpr");
 268                   end if;
 269
 270                   Add_Str_To_Name_Buffer
 271                     (Path_Separator & Prefix.all &
 272                      Directory_Separator & "lib" &
 273                      Directory_Separator & "gnat");
 274                end if;
 275
 276             else
 277                Current_Project_Path :=
 278                  new String'(Name_Buffer (1 .. Name_Len) & Path_Separator &
 279                              Prefix.all &
 280                              ".." &  Directory_Separator &
 281                              ".." & Directory_Separator &
 282                              ".." & Directory_Separator & "gnat");
 283             end if;
 284          end;
 285       end if;
 286
 287       if Current_Project_Path = null then
 288          Current_Project_Path := new String'(Name_Buffer (1 .. Name_Len));
 289       end if;
 290    end Initialize_Project_Path;
 291
 292    ------------------
 293    -- Project_Path --
 294    ------------------
 295
 296    function Project_Path return String is
 297    begin
 298       if Current_Project_Path = null then
 299          Initialize_Project_Path;
 300       end if;
 301
 302       return Current_Project_Path.all;
 303    end Project_Path;
 304
 305    -----------
 306    -- Reset --
 307    -----------
 308
 309    procedure Reset is
 310    begin
 311       Htable.Reset;
 312    end Reset;
 313
 314    ----------------------
 315    -- Set_Project_Path --
 316    ----------------------
 317
 318    procedure Set_Project_Path (New_Path : String) is
 319    begin
 320       Free (Current_Project_Path);
 321       Current_Project_Path := new String'(New_Path);
 322    end Set_Project_Path;
 323
 324    --------------
 325    -- Value_Of --
 326    --------------
 327
 328    function Value_Of
 329      (External_Name : Name_Id;
 330       With_Default  : Name_Id := No_Name)
 331       return          Name_Id
 332    is
 333       The_Value : Name_Id;
 334       Name      : String := Get_Name_String (External_Name);
 335
 336    begin
 337       Canonical_Case_File_Name (Name);
 338       Name_Len := Name'Length;
 339       Name_Buffer (1 .. Name_Len) := Name;
 340       The_Value := Htable.Get (Name_Find);
 341
 342       if The_Value /= No_Name then
 343          return The_Value;
 344       end if;
 345
 346       --  Find if it is an environment, if it is, put value in the hash table
 347
 348       declare
 349          Env_Value : String_Access := Getenv (Name);
 350
 351       begin
 352          if Env_Value /= null and then Env_Value'Length > 0 then
 353             Name_Len := Env_Value'Length;
 354             Name_Buffer (1 .. Name_Len) := Env_Value.all;
 355             The_Value := Name_Find;
 356             Htable.Set (External_Name, The_Value);
 357             Free (Env_Value);
 358             return The_Value;
 359
 360          else
 361             Free (Env_Value);
 362             return With_Default;
 363          end if;
 364       end;
 365    end Value_Of;
 366
 367 end Prj.Ext;