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