gcc/ada/exp_spark.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                            E X P _ S P A R K                             --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2013, 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 Atree;    use Atree;
  27 with Einfo;    use Einfo;
  28 with Exp_Dbug; use Exp_Dbug;
  29 with Exp_Util; use Exp_Util;
  30 with Sem_Res;  use Sem_Res;
  31 with Sem_Util; use Sem_Util;
  32 with Sinfo;    use Sinfo;
  33
  34 package body Exp_SPARK is
  35
  36    -----------------------
  37    -- Local Subprograms --
  38    -----------------------
  39
  40    procedure Expand_SPARK_N_Object_Renaming_Declaration (N : Node_Id);
  41    --  Perform name evaluation for a renamed object
  42
  43    procedure Expand_Potential_Renaming (N : Node_Id);
  44    --  N denotes a N_Identifier or N_Expanded_Name. If N references a renaming,
  45    --  replace N with the renamed object.
  46
  47    ------------------
  48    -- Expand_SPARK --
  49    ------------------
  50
  51    procedure Expand_SPARK (N : Node_Id) is
  52    begin
  53       case Nkind (N) is
  54
  55          --  Qualification of entity names in formal verification mode
  56          --  is limited to the addition of a suffix for homonyms (see
  57          --  Exp_Dbug.Qualify_Entity_Name). We used to qualify entity names
  58          --  as full expansion does, but this was removed as this prevents the
  59          --  verification back-end from using a short name for debugging and
  60          --  user interaction. The verification back-end already takes care
  61          --  of qualifying names when needed.
  62
  63          when N_Block_Statement     |
  64               N_Package_Body        |
  65               N_Package_Declaration |
  66               N_Subprogram_Body     =>
  67             Qualify_Entity_Names (N);
  68
  69          when N_Expanded_Name |
  70               N_Identifier    =>
  71             Expand_Potential_Renaming (N);
  72
  73          when N_Object_Renaming_Declaration =>
  74             Expand_SPARK_N_Object_Renaming_Declaration (N);
  75
  76          --  In SPARK mode, no other constructs require expansion
  77
  78          when others =>
  79             null;
  80       end case;
  81    end Expand_SPARK;
  82
  83    ------------------------------------------------
  84    -- Expand_SPARK_N_Object_Renaming_Declaration --
  85    ------------------------------------------------
  86
  87    procedure Expand_SPARK_N_Object_Renaming_Declaration (N : Node_Id) is
  88    begin
  89       --  Unconditionally remove all side effects from the name
  90
  91       Evaluate_Name (Name (N));
  92    end Expand_SPARK_N_Object_Renaming_Declaration;
  93
  94    -------------------------------
  95    -- Expand_Potential_Renaming --
  96    -------------------------------
  97
  98    procedure Expand_Potential_Renaming (N : Node_Id) is
  99       E : constant Entity_Id := Entity (N);
 100       T : constant Entity_Id := Etype (N);
 101
 102    begin
 103       --  Replace a reference to a renaming with the actual renamed object
 104
 105       if Ekind (E) in Object_Kind and then Present (Renamed_Object (E)) then
 106          Rewrite (N, New_Copy_Tree (Renamed_Object (E)));
 107          Reset_Analyzed_Flags (N);
 108          Analyze_And_Resolve (N, T);
 109       end if;
 110    end Expand_Potential_Renaming;
 111
 112 end Exp_SPARK;