gcc/ada/sem_scil.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S E M _ S C I L                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2009-2018, 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 --  This package contains routines involved in the frontend addition and
  27 --  verification of SCIL nodes.
  28
  29 with Atree; use Atree;
  30 with Types; use Types;
  31
  32 package Sem_SCIL is
  33
  34    --  SCIL (Statically Checkable Intermediate Language) is produced by the
  35    --  CodePeer back end (aka gnat2scil). For some constructs (tagged type
  36    --  declarations, dispatching calls, classwide membership tests), the
  37    --  CodePeer back end needs to locate certain nodes in the tree. To allow
  38    --  CodePeer to do this without introducing unwanted dependencies on the
  39    --  details of the FE's expansion strategies, SCIL_Nodes are generated.
  40
  41    --  For example, a dispatching call in the Ada source will, if CodePeer mode
  42    --  is enabled, result in the FE's generation of an N_Scil_Dispatching_Call
  43    --  node decorated with semantic attributes which identify the call itself,
  44    --  the primitive operation being called, the tagged type to which the
  45    --  operation belongs, and the controlling tag value of the call. If the FE
  46    --  implements some new expansion strategy for dispatching calls but this
  47    --  interface is preserved, the CodePeer back end should be unaffected.
  48
  49    function Check_SCIL_Node (N : Node_Id) return Traverse_Result;
  50    --  Process a single node during the tree traversal. Done to verify that
  51    --  SCIL nodes decoration fulfill the requirements of the SCIL backend.
  52
  53    procedure Check_SCIL_Nodes is new Traverse_Proc (Check_SCIL_Node);
  54    --  The traversal procedure itself
  55
  56    function First_Non_SCIL_Node (L : List_Id) return Node_Id;
  57    --  Returns the first non-SCIL node of list L
  58
  59    function Next_Non_SCIL_Node (N : Node_Id) return Node_Id;
  60    --  N must be a member of a list. Returns the next non SCIL node in the list
  61    --  containing N, or Empty if this is the last non SCIL node in the list.
  62
  63 end Sem_SCIL;