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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G H O S T --
-- --
-- S p e c --
-- --
-- Copyright (C) 2014-2021, 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 that deal with the static and runtime
-- semantics of Ghost entities.
with Opt; use Opt;
with Types; use Types;
package Ghost is
procedure Check_Ghost_Completion
(Prev_Id : Entity_Id;
Compl_Id : Entity_Id);
-- Verify that the Ghost policy of initial entity Prev_Id is compatible
-- with the Ghost policy of completing entity Compl_Id. Emit an error if
-- this is not the case.
procedure Check_Ghost_Context
(Ghost_Id : Entity_Id;
Ghost_Ref : Node_Id);
-- Determine whether node Ghost_Ref appears within a Ghost-friendly context
-- where Ghost entity Ghost_Id can safely reside.
procedure Check_Ghost_Overriding
(Subp : Entity_Id;
Overridden_Subp : Entity_Id);
-- Verify that the Ghost policy of parent subprogram Overridden_Subp is
-- compatible with the Ghost policy of overriding subprogram Subp. Emit
-- an error if this is not the case.
procedure Check_Ghost_Primitive (Prim : Entity_Id; Typ : Entity_Id);
-- Verify that the Ghost policy of primitive operation Prim is the same as
-- the Ghost policy of tagged type Typ. Emit an error if this is not the
-- case.
procedure Check_Ghost_Refinement
(State : Node_Id;
State_Id : Entity_Id;
Constit : Node_Id;
Constit_Id : Entity_Id);
-- Verify that the Ghost policy of constituent Constit_Id is compatible
-- with the Ghost policy of abstract state State_I.
procedure Check_Ghost_Type (Typ : Entity_Id);
-- Verify that Ghost type Typ is neither concurrent, nor effectively
-- volatile.
function Implements_Ghost_Interface (Typ : Entity_Id) return Boolean;
-- Determine whether type Typ implements at least one Ghost interface
procedure Initialize;
-- Initialize internal tables
procedure Install_Ghost_Region (Mode : Ghost_Mode_Type; N : Node_Id);
pragma Inline (Install_Ghost_Region);
-- Install a Ghost region described by mode Mode and ignored region start
-- node N.
function Is_Ghost_Assignment (N : Node_Id) return Boolean;
-- Determine whether arbitrary node N denotes an assignment statement whose
-- target is a Ghost entity.
function Is_Ghost_Declaration (N : Node_Id) return Boolean;
-- Determine whether arbitrary node N denotes a declaration which defines
-- a Ghost entity.
function Is_Ghost_Pragma (N : Node_Id) return Boolean;
-- Determine whether arbitrary node N denotes a pragma which encloses a
-- Ghost entity or is associated with a Ghost entity.
function Is_Ghost_Procedure_Call (N : Node_Id) return Boolean;
-- Determine whether arbitrary node N denotes a procedure call invoking a
-- Ghost procedure.
function Is_Ignored_Ghost_Unit (N : Node_Id) return Boolean;
-- Determine whether compilation unit N is subject to pragma Ghost with
-- policy Ignore.
procedure Lock;
-- Lock internal tables before calling backend
procedure Mark_And_Set_Ghost_Assignment (N : Node_Id);
-- Mark assignment statement N as Ghost when:
--
-- * The left hand side denotes a Ghost entity
--
-- Install the Ghost mode of the assignment statement. This routine starts
-- a Ghost region and must be used with routine Restore_Ghost_Region.
procedure Mark_And_Set_Ghost_Body
(N : Node_Id;
Spec_Id : Entity_Id);
-- Mark package or subprogram body N as Ghost when:
--
-- * The body is subject to pragma Ghost
--
-- * The body completes a previous declaration whose spec denoted by
-- Spec_Id is a Ghost entity.
--
-- * The body appears within a Ghost region
--
-- Install the Ghost mode of the body. This routine starts a Ghost region
-- and must be used with routine Restore_Ghost_Region.
procedure Mark_And_Set_Ghost_Completion
(N : Node_Id;
Prev_Id : Entity_Id);
-- Mark completion N of a deferred constant or private type [extension]
-- Ghost when:
--
-- * The entity of the previous declaration denoted by Prev_Id is Ghost
--
-- * The completion appears within a Ghost region
--
-- Install the Ghost mode of the completion. This routine starts a Ghost
-- region and must be used with routine Restore_Ghost_Region.
procedure Mark_And_Set_Ghost_Declaration (N : Node_Id);
-- Mark declaration N as Ghost when:
--
-- * The declaration is subject to pragma Ghost
--
-- * The declaration denotes a child package or subprogram and the parent
-- is a Ghost unit.
--
-- * The declaration appears within a Ghost region
--
-- Install the Ghost mode of the declaration. This routine starts a Ghost
-- region and must be used with routine Restore_Ghost_Region.
procedure Mark_And_Set_Ghost_Instantiation
(N : Node_Id;
Gen_Id : Entity_Id);
-- Mark instantiation N as Ghost when:
--
-- * The instantiation is subject to pragma Ghost
--
-- * The generic template denoted by Gen_Id is Ghost
--
-- * The instantiation appears within a Ghost region
--
-- Install the Ghost mode of the instantiation. This routine starts a Ghost
-- region and must be used with routine Restore_Ghost_Region.
procedure Mark_And_Set_Ghost_Procedure_Call (N : Node_Id);
-- Mark procedure call N as Ghost when:
--
-- * The procedure being invoked is a Ghost entity
--
-- Install the Ghost mode of the procedure call. This routine starts a
-- Ghost region and must be used with routine Restore_Ghost_Region.
procedure Mark_Ghost_Clause (N : Node_Id);
-- Mark use package, use type, or with clause N as Ghost when:
--
-- * The clause mentions a Ghost entity
procedure Mark_Ghost_Pragma
(N : Node_Id;
Id : Entity_Id);
-- Mark pragma N as Ghost when:
--
-- * The pragma encloses Ghost entity Id
--
-- * The pragma is associated with Ghost entity Id
procedure Mark_Ghost_Renaming
(N : Node_Id;
Id : Entity_Id);
-- Mark renaming declaration N as Ghost when:
--
-- * Renamed entity Id denotes a Ghost entity
procedure Remove_Ignored_Ghost_Code;
-- Remove all code marked as ignored Ghost from the trees of all qualifying
-- units (SPARK RM 6.9(4)).
--
-- WARNING: this is a separate front end pass, care should be taken to keep
-- it optimized.
procedure Restore_Ghost_Region (Mode : Ghost_Mode_Type; N : Node_Id);
pragma Inline (Restore_Ghost_Region);
-- Restore a Ghost region to a previous state described by mode Mode and
-- ignored region start node N. This routine must be used in conjunction
-- with the following routines:
--
-- Install_Ghost_Region
-- Mark_And_Set_xxx
-- Set_Ghost_Mode
procedure Set_Ghost_Mode (N : Node_Or_Entity_Id);
-- Install the Ghost mode of arbitrary node N. This routine starts a Ghost
-- region and must be used with routine Restore_Ghost_Region.
procedure Set_Is_Ghost_Entity (Id : Entity_Id);
-- Set the relevant Ghost attributes of entity Id depending on the current
-- Ghost assertion policy in effect.
end Ghost;
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