6cbcc54138
* xeinfo.adb: Don't look for revision numbers. * xnmake.adb: Likewise. * xsinfo.adb: Likewise. * xsnames.adb: Likewise. * xtreeprs.adb: Likewise. From-SVN: r50768
91 lines
5.2 KiB
Ada
91 lines
5.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ D I S P --
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-- --
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-- S p e c --
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-- --
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-- --
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-- Copyright (C) 1992-1999 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This package contains routines involved in tagged types and dynamic
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-- dispatching.
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with Types; use Types;
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package Sem_Disp is
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procedure Check_Controlling_Formals (Typ : Entity_Id; Subp : Entity_Id);
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-- Check that all controlling parameters of Subp are of type Typ,
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-- that defaults for controlling parameters are tag-indeterminate,
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-- and that the nominal subtype of the parameters and result
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-- statically match the first subtype of the controlling type.
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procedure Check_Dispatching_Call (N : Node_Id);
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-- Check if a call is a dispatching call. The subprogram is known to
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-- be a dispatching operation. The call is dispatching if all the
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-- controlling actuals are dynamically tagged. This procedure is called
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-- after overload resolution, so the call is known to be unambiguous.
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procedure Check_Dispatching_Operation (Subp, Old_Subp : Entity_Id);
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-- Add "Subp" to the list of primitive operations of the corresponding type
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-- if it has a parameter of this type and is defined at a proper place for
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-- primitive operations. (new primitives are only defined in package spec,
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-- overridden operation can be defined in any scope). If Old_Subp is not
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-- Empty we are in the overriding case.
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procedure Check_Operation_From_Incomplete_Type
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(Subp : Entity_Id;
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Typ : Entity_Id);
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-- If a primitive operation was defined for the incomplete view of the
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-- type, and the full type declaration is a derived type definition,
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-- the operation may override an inherited one.
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procedure Check_Operation_From_Private_View (Subp, Old_Subp : Entity_Id);
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-- Add "Old_Subp" to the list of primitive operations of the corresponding
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-- tagged type if it is the full view of a private tagged type. The Alias
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-- of "OldSubp" is adjusted to point to the inherited procedure of the
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-- full view because it is always this one which has to be called.
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function Find_Controlling_Arg (N : Node_Id) return Node_Id;
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-- Returns the actual controlling argument if N is dynamically tagged,
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-- and Empty if it is not dynamically tagged.
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function Find_Dispatching_Type (Subp : Entity_Id) return Entity_Id;
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-- Check whether a subprogram is dispatching, and find the tagged
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-- type of the controlling argument or arguments.
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function Is_Dynamically_Tagged (N : Node_Id) return Boolean;
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-- Used to determine whether a call is dispatching, i.e. if is an
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-- an expression of a class_Wide type, or a call to a function with
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-- controlling result where at least one operand is dynamically tagged.
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function Is_Tag_Indeterminate (N : Node_Id) return Boolean;
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-- An expression is tag-indeterminate if it is a call that dispatches
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-- on result, and all controlling operands are also indeterminate.
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-- Such a function call may inherit a tag from an enclosing call.
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procedure Propagate_Tag (Control : Node_Id; Actual : Node_Id);
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-- If a function call is tag-indeterminate, its controlling argument is
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-- found in the context; either an enclosing call, or the left-hand side
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-- of the enclosing assignment statement. The tag must be propagated
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-- recursively to the tag-indeterminate actuals of the call.
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end Sem_Disp;
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