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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ S C I L --
-- --
-- S p e c --
-- --
-- Copyright (C) 2009-2022, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package contains routines involved in the frontend addition and
-- verification of SCIL nodes.
with Atree; use Atree;
with Types; use Types;
package Sem_SCIL is
-- SCIL (Statically Checkable Intermediate Language) is produced by the
-- CodePeer back end (aka gnat2scil). For some constructs (tagged type
-- declarations, dispatching calls, classwide membership tests), the
-- CodePeer back end needs to locate certain nodes in the tree. To allow
-- CodePeer to do this without introducing unwanted dependencies on the
-- details of the FE's expansion strategies, SCIL_Nodes are generated.
-- For example, a dispatching call in the Ada source will, if CodePeer mode
-- is enabled, result in the FE's generation of an N_Scil_Dispatching_Call
-- node decorated with semantic attributes which identify the call itself,
-- the primitive operation being called, the tagged type to which the
-- operation belongs, and the controlling tag value of the call. If the FE
-- implements some new expansion strategy for dispatching calls but this
-- interface is preserved, the CodePeer back end should be unaffected.
function Check_SCIL_Node (N : Node_Id) return Traverse_Result;
-- Process a single node during the tree traversal. Done to verify that
-- SCIL nodes decoration fulfill the requirements of the SCIL backend.
procedure Check_SCIL_Nodes is new Traverse_Proc (Check_SCIL_Node);
-- The traversal procedure itself
function First_Non_SCIL_Node (L : List_Id) return Node_Id;
-- Returns the first non-SCIL node of list L
function Next_Non_SCIL_Node (N : Node_Id) return Node_Id;
-- N must be a member of a list. Returns the next non SCIL node in the list
-- containing N, or Empty if this is the last non SCIL node in the list.
end Sem_SCIL;
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