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) 2000-2009, 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 Osint;    use Osint;
  29 with Sdefault;
  30 with Table;
  31
  32 with GNAT.HTable;
  33
  34 package body Prj.Ext is
  35
  36    Ada_Project_Path : constant String := "ADA_PROJECT_PATH";
  37    --  Name of alternate env. variable that contain path name(s) of directories
  38    --  where project files may reside. GPR_PROJECT_PATH has precedence over
  39    --  ADA_PROJECT_PATH.
  40
  41    Gpr_Prj_Path : constant String_Access := Getenv (Gpr_Project_Path);
  42    Ada_Prj_Path : constant String_Access := Getenv (Ada_Project_Path);
  43    --  The path name(s) of directories where project files may reside.
  44    --  May be empty.
  45
  46    No_Project_Default_Dir : constant String := "-";
  47
  48    Current_Project_Path : String_Access;
  49    --  The project path. Initialized by procedure Initialize_Project_Path
  50    --  below.
  51
  52    procedure Initialize_Project_Path;
  53    --  Initialize Current_Project_Path
  54
  55    package Htable is new GNAT.HTable.Simple_HTable
  56      (Header_Num => Header_Num,
  57       Element    => Name_Id,
  58       No_Element => No_Name,
  59       Key        => Name_Id,
  60       Hash       => Hash,
  61       Equal      => "=");
  62    --  External references are stored in this hash table, either by procedure
  63    --  Add (directly or through a call to function Check) or by function
  64    --  Value_Of when an environment variable is found non empty. Value_Of
  65    --  first for external reference in this table, before checking the
  66    --  environment. Htable is emptied (reset) by procedure Reset.
  67
  68    package Search_Directories is new Table.Table
  69      (Table_Component_Type => Name_Id,
  70       Table_Index_Type     => Natural,
  71       Table_Low_Bound      => 1,
  72       Table_Initial        => 4,
  73       Table_Increment      => 100,
  74       Table_Name           => "Prj.Ext.Search_Directories");
  75    --  The table for the directories specified with -aP switches
  76
  77    ---------
  78    -- Add --
  79    ---------
  80
  81    procedure Add
  82      (External_Name : String;
  83       Value         : String)
  84    is
  85       The_Key   : Name_Id;
  86       The_Value : Name_Id;
  87    begin
  88       Name_Len := Value'Length;
  89       Name_Buffer (1 .. Name_Len) := Value;
  90       The_Value := Name_Find;
  91       Name_Len := External_Name'Length;
  92       Name_Buffer (1 .. Name_Len) := External_Name;
  93       Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
  94       The_Key := Name_Find;
  95       Htable.Set (The_Key, The_Value);
  96    end Add;
  97
  98    -----------
  99    ----------------------------------
 100    -- Add_Search_Project_Directory --
 101    ----------------------------------
 102
 103    procedure Add_Search_Project_Directory (Path : String) is
 104    begin
 105       Name_Len := 0;
 106       Add_Str_To_Name_Buffer (Path);
 107       Search_Directories.Append (Name_Find);
 108    end Add_Search_Project_Directory;
 109
 110    -- Check --
 111    -----------
 112
 113    function Check (Declaration : String) return Boolean is
 114    begin
 115       for Equal_Pos in Declaration'Range loop
 116          if Declaration (Equal_Pos) = '=' then
 117             exit when Equal_Pos = Declaration'First;
 118             exit when Equal_Pos = Declaration'Last;
 119             Add
 120               (External_Name =>
 121                  Declaration (Declaration'First .. Equal_Pos - 1),
 122                Value =>
 123                  Declaration (Equal_Pos + 1 .. Declaration'Last));
 124             return True;
 125          end if;
 126       end loop;
 127
 128       return False;
 129    end Check;
 130
 131    -----------------------------
 132    -- Initialize_Project_Path --
 133    -----------------------------
 134
 135    procedure Initialize_Project_Path is
 136       Add_Default_Dir : Boolean := True;
 137       First           : Positive;
 138       Last            : Positive;
 139       New_Len         : Positive;
 140       New_Last        : Positive;
 141
 142    begin
 143       --  The current directory is always first
 144
 145       Name_Len := 1;
 146       Name_Buffer (Name_Len) := '.';
 147
 148       --  If there are directories in the Search_Directories table, add them
 149
 150       for J in 1 .. Search_Directories.Last loop
 151          Name_Len := Name_Len + 1;
 152          Name_Buffer (Name_Len) := Path_Separator;
 153          Add_Str_To_Name_Buffer
 154            (Get_Name_String (Search_Directories.Table (J)));
 155       end loop;
 156
 157       --  If environment variable is defined and not empty, add its content
 158
 159       if Gpr_Prj_Path.all /= "" then
 160          Name_Len := Name_Len + 1;
 161          Name_Buffer (Name_Len) := Path_Separator;
 162          Add_Str_To_Name_Buffer (Gpr_Prj_Path.all);
 163       end if;
 164
 165       if Ada_Prj_Path.all /= "" then
 166          Name_Len := Name_Len + 1;
 167          Name_Buffer (Name_Len) := Path_Separator;
 168          Add_Str_To_Name_Buffer (Ada_Prj_Path.all);
 169       end if;
 170
 171       --  Scan the directory path to see if "-" is one of the directories.
 172       --  Remove each occurrence of "-" and set Add_Default_Dir to False.
 173       --  Also resolve relative paths and symbolic links.
 174
 175       First := 3;
 176       loop
 177          while First <= Name_Len
 178            and then (Name_Buffer (First) = Path_Separator)
 179          loop
 180             First := First + 1;
 181          end loop;
 182
 183          exit when First > Name_Len;
 184
 185          Last := First;
 186
 187          while Last < Name_Len
 188            and then Name_Buffer (Last + 1) /= Path_Separator
 189          loop
 190             Last := Last + 1;
 191          end loop;
 192
 193          --  If the directory is "-", set Add_Default_Dir to False and
 194          --  remove from path.
 195
 196          if Name_Buffer (First .. Last) = No_Project_Default_Dir then
 197             Add_Default_Dir := False;
 198
 199             for J in Last + 1 .. Name_Len loop
 200                Name_Buffer (J - No_Project_Default_Dir'Length - 1) :=
 201                  Name_Buffer (J);
 202             end loop;
 203
 204             Name_Len := Name_Len - No_Project_Default_Dir'Length - 1;
 205
 206             --  After removing the '-', go back one character to get the next
 207             --  directory correctly.
 208
 209             Last := Last - 1;
 210
 211          elsif not Hostparm.OpenVMS
 212            or else not Is_Absolute_Path (Name_Buffer (First .. Last))
 213          then
 214             --  On VMS, only expand relative path names, as absolute paths
 215             --  may correspond to multi-valued VMS logical names.
 216
 217             declare
 218                New_Dir : constant String :=
 219                            Normalize_Pathname (Name_Buffer (First .. Last));
 220
 221             begin
 222                --  If the absolute path was resolved and is different from
 223                --  the original, replace original with the resolved path.
 224
 225                if New_Dir /= Name_Buffer (First .. Last)
 226                  and then New_Dir'Length /= 0
 227                then
 228                   New_Len := Name_Len + New_Dir'Length - (Last - First + 1);
 229                   New_Last := First + New_Dir'Length - 1;
 230                   Name_Buffer (New_Last + 1 .. New_Len) :=
 231                     Name_Buffer (Last + 1 .. Name_Len);
 232                   Name_Buffer (First .. New_Last) := New_Dir;
 233                   Name_Len := New_Len;
 234                   Last := New_Last;
 235                end if;
 236             end;
 237          end if;
 238
 239          First := Last + 1;
 240       end loop;
 241
 242       --  Set the initial value of Current_Project_Path
 243
 244       if Add_Default_Dir then
 245          declare
 246             Prefix : String_Ptr := Sdefault.Search_Dir_Prefix;
 247
 248          begin
 249             if Prefix = null then
 250                Prefix := new String'(Executable_Prefix_Path);
 251
 252                if Prefix.all /= "" then
 253                   Add_Str_To_Name_Buffer
 254                     (Path_Separator & Prefix.all &
 255                      "share" & Directory_Separator & "gpr");
 256                   Add_Str_To_Name_Buffer
 257                     (Path_Separator & Prefix.all &
 258                      Directory_Separator & "lib" &
 259                      Directory_Separator & "gnat");
 260                end if;
 261
 262             else
 263                Current_Project_Path :=
 264                  new String'(Name_Buffer (1 .. Name_Len) & Path_Separator &
 265                              Prefix.all &
 266                              ".." &  Directory_Separator &
 267                              ".." & Directory_Separator &
 268                              ".." & Directory_Separator & "gnat");
 269             end if;
 270
 271             Free (Prefix);
 272          end;
 273       end if;
 274
 275       if Current_Project_Path = null then
 276          Current_Project_Path := new String'(Name_Buffer (1 .. Name_Len));
 277       end if;
 278    end Initialize_Project_Path;
 279
 280    ------------------
 281    -- Project_Path --
 282    ------------------
 283
 284    function Project_Path return String is
 285    begin
 286       if Current_Project_Path = null then
 287          Initialize_Project_Path;
 288       end if;
 289
 290       return Current_Project_Path.all;
 291    end Project_Path;
 292
 293    -----------
 294    -- Reset --
 295    -----------
 296
 297    procedure Reset is
 298    begin
 299       Htable.Reset;
 300    end Reset;
 301
 302    ----------------------
 303    -- Set_Project_Path --
 304    ----------------------
 305
 306    procedure Set_Project_Path (New_Path : String) is
 307    begin
 308       Free (Current_Project_Path);
 309       Current_Project_Path := new String'(New_Path);
 310    end Set_Project_Path;
 311
 312    --------------
 313    -- Value_Of --
 314    --------------
 315
 316    function Value_Of
 317      (External_Name : Name_Id;
 318       With_Default  : Name_Id := No_Name)
 319       return          Name_Id
 320    is
 321       The_Value : Name_Id;
 322       Name      : String := Get_Name_String (External_Name);
 323
 324    begin
 325       Canonical_Case_File_Name (Name);
 326       Name_Len := Name'Length;
 327       Name_Buffer (1 .. Name_Len) := Name;
 328       The_Value := Htable.Get (Name_Find);
 329
 330       if The_Value /= No_Name then
 331          return The_Value;
 332       end if;
 333
 334       --  Find if it is an environment, if it is, put value in the hash table
 335
 336       declare
 337          Env_Value : String_Access := Getenv (Name);
 338
 339       begin
 340          if Env_Value /= null and then Env_Value'Length > 0 then
 341             Name_Len := Env_Value'Length;
 342             Name_Buffer (1 .. Name_Len) := Env_Value.all;
 343             The_Value := Name_Find;
 344             Htable.Set (External_Name, The_Value);
 345             Free (Env_Value);
 346             return The_Value;
 347
 348          else
 349             Free (Env_Value);
 350             return With_Default;
 351          end if;
 352       end;
 353    end Value_Of;
 354
 355 end Prj.Ext;