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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ S C I L --
-- --
-- B o d y --
-- --
-- Copyright (C) 2009-2012, 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. --
-- --
------------------------------------------------------------------------------
with Einfo; use Einfo;
with Nlists; use Nlists;
with Rtsfind; use Rtsfind;
with Sem_Aux; use Sem_Aux;
with Sinfo; use Sinfo;
with Stand; use Stand;
with SCIL_LL; use SCIL_LL;
package body Sem_SCIL is
---------------------
-- Check_SCIL_Node --
---------------------
function Check_SCIL_Node (N : Node_Id) return Traverse_Result is
SCIL_Node : constant Node_Id := Get_SCIL_Node (N);
Ctrl_Tag : Node_Id;
Ctrl_Typ : Entity_Id;
begin
-- For nodes that do not have SCIL node continue traversing the tree
if No (SCIL_Node) then
return OK;
end if;
case Nkind (SCIL_Node) is
when N_SCIL_Dispatch_Table_Tag_Init =>
pragma Assert (Nkind (N) = N_Object_Declaration);
null;
when N_SCIL_Dispatching_Call =>
Ctrl_Tag := SCIL_Controlling_Tag (SCIL_Node);
-- Parent of SCIL dispatching call nodes MUST be a subprogram call
if Nkind (N) not in N_Subprogram_Call then
raise Program_Error;
-- In simple cases the controlling tag is the tag of the
-- controlling argument (i.e. Obj.Tag).
elsif Nkind (Ctrl_Tag) = N_Selected_Component then
Ctrl_Typ := Etype (Ctrl_Tag);
-- Interface types are unsupported
if Is_Interface (Ctrl_Typ)
or else (RTE_Available (RE_Interface_Tag)
and then Ctrl_Typ = RTE (RE_Interface_Tag))
then
null;
else
pragma Assert (Ctrl_Typ = RTE (RE_Tag));
null;
end if;
-- When the controlling tag of a dispatching call is an identifier
-- the SCIL_Controlling_Tag attribute references the corresponding
-- object or parameter declaration. Interface types are still
-- unsupported.
elsif Nkind_In (Ctrl_Tag, N_Object_Declaration,
N_Parameter_Specification)
then
Ctrl_Typ := Etype (Defining_Identifier (Ctrl_Tag));
-- Interface types are unsupported.
if Is_Interface (Ctrl_Typ)
or else (RTE_Available (RE_Interface_Tag)
and then Ctrl_Typ = RTE (RE_Interface_Tag))
or else (Is_Access_Type (Ctrl_Typ)
and then
Is_Interface
(Available_View
(Base_Type (Designated_Type (Ctrl_Typ)))))
then
null;
else
pragma Assert
(Ctrl_Typ = RTE (RE_Tag)
or else
(Is_Access_Type (Ctrl_Typ)
and then Available_View
(Base_Type (Designated_Type (Ctrl_Typ)))
= RTE (RE_Tag)));
null;
end if;
-- Interface types are unsupported
elsif Is_Interface (Etype (Ctrl_Tag)) then
null;
else
pragma Assert (False);
raise Program_Error;
end if;
return Skip;
when N_SCIL_Membership_Test =>
-- Check contents of the boolean expression associated with the
-- membership test.
pragma Assert (Nkind_In (N, N_Identifier,
N_And_Then,
N_Or_Else,
N_Expression_With_Actions)
and then Etype (N) = Standard_Boolean);
-- Check the entity identifier of the associated tagged type (that
-- is, in testing for membership in T'Class, the entity id of the
-- specific type T).
-- Note: When the SCIL node is generated the private and full-view
-- of the tagged types may have been swapped and hence the node
-- referenced by attribute SCIL_Entity may be the private view.
-- Therefore, in order to uniformly locate the full-view we use
-- attribute Underlying_Type.
pragma Assert
(Is_Tagged_Type (Underlying_Type (SCIL_Entity (SCIL_Node))));
-- Interface types are unsupported
pragma Assert
(not Is_Interface (Underlying_Type (SCIL_Entity (SCIL_Node))));
-- Check the decoration of the expression that denotes the tag
-- value being tested
Ctrl_Tag := SCIL_Tag_Value (SCIL_Node);
case Nkind (Ctrl_Tag) is
-- For class-wide membership tests the SCIL tag value is the
-- tag of the tested object (i.e. Obj.Tag).
when N_Selected_Component =>
pragma Assert (Etype (Ctrl_Tag) = RTE (RE_Tag));
null;
when others =>
pragma Assert (False);
null;
end case;
return Skip;
when others =>
pragma Assert (False);
raise Program_Error;
end case;
return Skip;
end Check_SCIL_Node;
-------------------------
-- First_Non_SCIL_Node --
-------------------------
function First_Non_SCIL_Node (L : List_Id) return Node_Id is
N : Node_Id;
begin
N := First (L);
while Nkind (N) in N_SCIL_Node loop
Next (N);
end loop;
return N;
end First_Non_SCIL_Node;
------------------------
-- Next_Non_SCIL_Node --
------------------------
function Next_Non_SCIL_Node (N : Node_Id) return Node_Id is
Aux_N : Node_Id;
begin
Aux_N := Next (N);
while Nkind (Aux_N) in N_SCIL_Node loop
Next (Aux_N);
end loop;
return Aux_N;
end Next_Non_SCIL_Node;
end Sem_SCIL;
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