gcc/ada/par-ch8.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P A R . C H 8                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2010, 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 pragma Style_Checks (All_Checks);
  27 --  Turn off subprogram body ordering check. Subprograms are in order
  28 --  by RM section rather than alphabetical
  29
  30 separate (Par)
  31 package body Ch8 is
  32
  33    -----------------------
  34    -- Local Subprograms --
  35    -----------------------
  36
  37    function P_Use_Package_Clause                           return Node_Id;
  38    function P_Use_Type_Clause                              return Node_Id;
  39
  40    ---------------------
  41    -- 8.4  Use Clause --
  42    ---------------------
  43
  44    --  USE_CLAUSE ::= USE_PACKAGE_CLAUSE | USE_TYPE_CLAUSE
  45
  46    --  The caller has checked that the initial token is USE
  47
  48    --  Error recovery: cannot raise Error_Resync
  49
  50    function P_Use_Clause return Node_Id is
  51    begin
  52       Scan; -- past USE
  53
  54       if Token = Tok_Type or else Token = Tok_All then
  55          return P_Use_Type_Clause;
  56       else
  57          return P_Use_Package_Clause;
  58       end if;
  59    end P_Use_Clause;
  60
  61    -----------------------------
  62    -- 8.4  Use Package Clause --
  63    -----------------------------
  64
  65    --  USE_PACKAGE_CLAUSE ::= use package_NAME {, package_NAME};
  66
  67    --  The caller has scanned out the USE keyword
  68
  69    --  Error recovery: cannot raise Error_Resync
  70
  71    function P_Use_Package_Clause return Node_Id is
  72       Use_Node : Node_Id;
  73
  74    begin
  75       Use_Node := New_Node (N_Use_Package_Clause, Prev_Token_Ptr);
  76       Set_Names (Use_Node, New_List);
  77
  78       if Token = Tok_Package then
  79          Error_Msg_SC ("PACKAGE should not appear here");
  80          Scan; -- past PACKAGE
  81       end if;
  82
  83       loop
  84          Append (P_Qualified_Simple_Name, Names (Use_Node));
  85          exit when Token /= Tok_Comma;
  86          Scan; -- past comma
  87       end loop;
  88
  89       TF_Semicolon;
  90       return Use_Node;
  91    end P_Use_Package_Clause;
  92
  93    --------------------------
  94    -- 8.4  Use Type Clause --
  95    --------------------------
  96
  97    --  USE_TYPE_CLAUSE ::= use [ALL] type SUBTYPE_MARK {, SUBTYPE_MARK};
  98
  99    --  The caller has checked that the initial token is USE, scanned it out
 100    --  and that the current token is either ALL or TYPE.
 101
 102    --  Note: Use of ALL is an Ada 2012 feature
 103
 104    --  Error recovery: cannot raise Error_Resync
 105
 106    function P_Use_Type_Clause return Node_Id is
 107       Use_Node    : Node_Id;
 108       All_Present : Boolean;
 109
 110    begin
 111       if Token = Tok_All then
 112          if Ada_Version < Ada_2012 then
 113             Error_Msg_SC ("|`USE ALL TYPE` is an Ada 2012 feature");
 114             Error_Msg_SC ("\|unit must be compiled with -gnat2012 switch");
 115          end if;
 116
 117          All_Present := True;
 118          Scan; -- past ALL
 119
 120       else
 121          All_Present := False;
 122       end if;
 123
 124       Use_Node := New_Node (N_Use_Type_Clause, Prev_Token_Ptr);
 125       Set_All_Present (Use_Node, All_Present);
 126       Set_Subtype_Marks (Use_Node, New_List);
 127       Set_Used_Operations (Use_Node, No_Elist);
 128
 129       if Ada_Version = Ada_83 then
 130          Error_Msg_SC ("(Ada 83) use type not allowed!");
 131       end if;
 132
 133       Scan; -- past TYPE
 134
 135       loop
 136          Append (P_Subtype_Mark, Subtype_Marks (Use_Node));
 137          No_Constraint;
 138          exit when Token /= Tok_Comma;
 139          Scan; -- past comma
 140       end loop;
 141
 142       TF_Semicolon;
 143       return Use_Node;
 144    end P_Use_Type_Clause;
 145
 146    -------------------------------
 147    -- 8.5  Renaming Declaration --
 148    -------------------------------
 149
 150    --  Object renaming declarations and exception renaming declarations
 151    --  are parsed by P_Identifier_Declaration (3.3.1)
 152
 153    --  Subprogram renaming declarations are parsed by P_Subprogram (6.1)
 154
 155    --  Package renaming declarations are parsed by P_Package (7.1)
 156
 157    --  Generic renaming declarations are parsed by P_Generic (12.1)
 158
 159    ----------------------------------------
 160    -- 8.5.1  Object Renaming Declaration --
 161    ----------------------------------------
 162
 163    --  Parsed by P_Identifier_Declarations (3.3.1)
 164
 165    ----------------------------------------
 166    -- 8.5.2  Exception Renaming Declaration --
 167    ----------------------------------------
 168
 169    --  Parsed by P_Identifier_Declarations (3.3.1)
 170
 171    -----------------------------------------
 172    -- 8.5.3  Package Renaming Declaration --
 173    -----------------------------------------
 174
 175    --  Parsed by P_Package (7.1)
 176
 177    --------------------------------------------
 178    -- 8.5.4  Subprogram Renaming Declaration --
 179    --------------------------------------------
 180
 181    --  Parsed by P_Subprogram (6.1)
 182
 183    -----------------------------------------
 184    -- 8.5.2  Generic Renaming Declaration --
 185    -----------------------------------------
 186
 187    --  Parsed by P_Generic (12.1)
 188
 189 end Ch8;