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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P A N D E R --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2011, 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 3, 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 COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Debug_A; use Debug_A;
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with Errout; use Errout;
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with Exp_Aggr; use Exp_Aggr;
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with Exp_Alfa; use Exp_Alfa;
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with Exp_Attr; use Exp_Attr;
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with Exp_Ch2; use Exp_Ch2;
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with Exp_Ch3; use Exp_Ch3;
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with Exp_Ch4; use Exp_Ch4;
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with Exp_Ch5; use Exp_Ch5;
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with Exp_Ch6; use Exp_Ch6;
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with Exp_Ch7; use Exp_Ch7;
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with Exp_Ch8; use Exp_Ch8;
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with Exp_Ch9; use Exp_Ch9;
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with Exp_Ch11; use Exp_Ch11;
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with Exp_Ch12; use Exp_Ch12;
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with Exp_Ch13; use Exp_Ch13;
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with Exp_Prag; use Exp_Prag;
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with Opt; use Opt;
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with Rtsfind; use Rtsfind;
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with Sem; use Sem;
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with Sem_Ch8; use Sem_Ch8;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Table;
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package body Expander is
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----------------
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-- Local Data --
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----------------
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-- The following table is used to save values of the Expander_Active flag
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-- when they are saved by Expander_Mode_Save_And_Set. We use an extendible
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-- table (which is a bit of overkill) because it is easier than figuring
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-- out a maximum value or bothering with range checks!
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package Expander_Flags is new Table.Table (
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Table_Component_Type => Boolean,
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Table_Index_Type => Int,
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Table_Low_Bound => 0,
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Table_Initial => 32,
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Table_Increment => 200,
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Table_Name => "Expander_Flags");
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------------
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-- Expand --
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------------
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procedure Expand (N : Node_Id) is
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begin
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-- If we were analyzing a default expression (or other spec expression)
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-- the Full_Analysis flag must be off. If we are in expansion mode then
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-- we must be performing a full analysis. If we are analyzing a generic
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-- then Expansion must be off.
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pragma Assert
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(not (Full_Analysis and then In_Spec_Expression)
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and then (Full_Analysis or else not Expander_Active)
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and then not (Inside_A_Generic and then Expander_Active));
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-- There are three reasons for the Expander_Active flag to be false
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--
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-- The first is when are not generating code. In this mode the
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-- Full_Analysis flag indicates whether we are performing a complete
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-- analysis, in which case Full_Analysis = True or a pre-analysis in
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-- which case Full_Analysis = False. See the spec of Sem for more
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-- info on this.
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--
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-- The second reason for the Expander_Active flag to be False is that
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-- we are performing a pre-analysis. During pre-analysis all expansion
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-- activity is turned off to make sure nodes are semantically decorated
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-- but no extra nodes are generated. This is for instance needed for
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-- the first pass of aggregate semantic processing. Note that in this
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-- case the Full_Analysis flag is set to False because the node will
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-- subsequently be re-analyzed with expansion on (see the spec of sem).
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-- Finally, expansion is turned off in a regular compilation if there
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-- are serious errors. In that case there will be no further expansion,
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-- but one cleanup action may be required: if a transient scope was
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-- created (e.g. for a function that returns an unconstrained type) the
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-- scope may still be on the stack, and must be removed explicitly,
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-- given that the expansion actions that would normally process it will
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-- not take place. This prevents cascaded errors due to stack mismatch.
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if not Expander_Active then
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Set_Analyzed (N, Full_Analysis);
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if Serious_Errors_Detected > 0
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and then Scope_Is_Transient
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then
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Scope_Stack.Table
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(Scope_Stack.Last).Actions_To_Be_Wrapped_Before := No_List;
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Scope_Stack.Table
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(Scope_Stack.Last).Actions_To_Be_Wrapped_After := No_List;
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Pop_Scope;
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end if;
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return;
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else
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Debug_A_Entry ("expanding ", N);
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begin
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-- In Alfa mode we only need a very limited subset of the usual
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-- expansions. This limited subset is implemented in Expand_Alfa.
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if Alfa_Mode then
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Expand_Alfa (N);
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-- Here for normal non-Alfa mode
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else
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-- Processing depends on node kind. For full details on the
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-- expansion activity required in each case, see bodies of
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-- corresponding expand routines.
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case Nkind (N) is
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when N_Abort_Statement =>
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Expand_N_Abort_Statement (N);
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when N_Accept_Statement =>
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Expand_N_Accept_Statement (N);
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when N_Aggregate =>
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Expand_N_Aggregate (N);
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when N_Allocator =>
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Expand_N_Allocator (N);
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when N_And_Then =>
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Expand_N_And_Then (N);
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when N_Assignment_Statement =>
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Expand_N_Assignment_Statement (N);
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when N_Asynchronous_Select =>
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Expand_N_Asynchronous_Select (N);
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when N_Attribute_Definition_Clause =>
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Expand_N_Attribute_Definition_Clause (N);
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when N_Attribute_Reference =>
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Expand_N_Attribute_Reference (N);
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when N_Block_Statement =>
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Expand_N_Block_Statement (N);
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when N_Case_Expression =>
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Expand_N_Case_Expression (N);
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when N_Case_Statement =>
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Expand_N_Case_Statement (N);
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when N_Conditional_Entry_Call =>
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Expand_N_Conditional_Entry_Call (N);
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when N_Conditional_Expression =>
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Expand_N_Conditional_Expression (N);
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when N_Delay_Relative_Statement =>
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Expand_N_Delay_Relative_Statement (N);
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when N_Delay_Until_Statement =>
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Expand_N_Delay_Until_Statement (N);
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when N_Entry_Body =>
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Expand_N_Entry_Body (N);
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when N_Entry_Call_Statement =>
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Expand_N_Entry_Call_Statement (N);
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when N_Entry_Declaration =>
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Expand_N_Entry_Declaration (N);
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when N_Exception_Declaration =>
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Expand_N_Exception_Declaration (N);
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when N_Exception_Renaming_Declaration =>
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Expand_N_Exception_Renaming_Declaration (N);
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when N_Exit_Statement =>
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Expand_N_Exit_Statement (N);
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when N_Expanded_Name =>
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Expand_N_Expanded_Name (N);
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when N_Explicit_Dereference =>
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Expand_N_Explicit_Dereference (N);
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when N_Expression_With_Actions =>
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Expand_N_Expression_With_Actions (N);
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when N_Extended_Return_Statement =>
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Expand_N_Extended_Return_Statement (N);
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when N_Extension_Aggregate =>
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Expand_N_Extension_Aggregate (N);
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when N_Free_Statement =>
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Expand_N_Free_Statement (N);
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when N_Freeze_Entity =>
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Expand_N_Freeze_Entity (N);
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when N_Full_Type_Declaration =>
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Expand_N_Full_Type_Declaration (N);
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when N_Function_Call =>
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Expand_N_Function_Call (N);
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when N_Generic_Instantiation =>
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Expand_N_Generic_Instantiation (N);
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when N_Goto_Statement =>
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Expand_N_Goto_Statement (N);
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when N_Handled_Sequence_Of_Statements =>
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Expand_N_Handled_Sequence_Of_Statements (N);
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when N_Identifier =>
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Expand_N_Identifier (N);
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when N_Indexed_Component =>
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Expand_N_Indexed_Component (N);
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when N_If_Statement =>
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Expand_N_If_Statement (N);
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when N_In =>
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Expand_N_In (N);
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when N_Loop_Statement =>
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Expand_N_Loop_Statement (N);
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when N_Not_In =>
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Expand_N_Not_In (N);
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when N_Null =>
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Expand_N_Null (N);
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when N_Object_Declaration =>
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Expand_N_Object_Declaration (N);
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when N_Object_Renaming_Declaration =>
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Expand_N_Object_Renaming_Declaration (N);
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when N_Op_Add =>
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Expand_N_Op_Add (N);
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when N_Op_Abs =>
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Expand_N_Op_Abs (N);
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when N_Op_And =>
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Expand_N_Op_And (N);
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when N_Op_Concat =>
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Expand_N_Op_Concat (N);
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when N_Op_Divide =>
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Expand_N_Op_Divide (N);
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when N_Op_Eq =>
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Expand_N_Op_Eq (N);
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when N_Op_Expon =>
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Expand_N_Op_Expon (N);
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296 |
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when N_Op_Ge =>
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Expand_N_Op_Ge (N);
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when N_Op_Gt =>
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Expand_N_Op_Gt (N);
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when N_Op_Le =>
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Expand_N_Op_Le (N);
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when N_Op_Lt =>
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Expand_N_Op_Lt (N);
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when N_Op_Minus =>
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Expand_N_Op_Minus (N);
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311 |
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when N_Op_Mod =>
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Expand_N_Op_Mod (N);
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314 |
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when N_Op_Multiply =>
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Expand_N_Op_Multiply (N);
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316 |
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317 |
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when N_Op_Ne =>
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Expand_N_Op_Ne (N);
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319 |
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320 |
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when N_Op_Not =>
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Expand_N_Op_Not (N);
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322 |
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323 |
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when N_Op_Or =>
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Expand_N_Op_Or (N);
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325 |
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326 |
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when N_Op_Plus =>
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Expand_N_Op_Plus (N);
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329 |
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when N_Op_Rem =>
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Expand_N_Op_Rem (N);
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331 |
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332 |
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when N_Op_Rotate_Left =>
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Expand_N_Op_Rotate_Left (N);
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when N_Op_Rotate_Right =>
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Expand_N_Op_Rotate_Right (N);
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337 |
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338 |
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when N_Op_Shift_Left =>
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Expand_N_Op_Shift_Left (N);
|
340 |
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341 |
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when N_Op_Shift_Right =>
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342 |
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Expand_N_Op_Shift_Right (N);
|
343 |
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when N_Op_Shift_Right_Arithmetic =>
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Expand_N_Op_Shift_Right_Arithmetic (N);
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346 |
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347 |
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when N_Op_Subtract =>
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348 |
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Expand_N_Op_Subtract (N);
|
349 |
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350 |
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when N_Op_Xor =>
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Expand_N_Op_Xor (N);
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352 |
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when N_Or_Else =>
|
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Expand_N_Or_Else (N);
|
355 |
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when N_Package_Body =>
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357 |
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Expand_N_Package_Body (N);
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358 |
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359 |
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when N_Package_Declaration =>
|
360 |
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Expand_N_Package_Declaration (N);
|
361 |
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362 |
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when N_Package_Renaming_Declaration =>
|
363 |
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Expand_N_Package_Renaming_Declaration (N);
|
364 |
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365 |
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when N_Subprogram_Renaming_Declaration =>
|
366 |
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Expand_N_Subprogram_Renaming_Declaration (N);
|
367 |
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368 |
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when N_Pragma =>
|
369 |
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Expand_N_Pragma (N);
|
370 |
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371 |
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when N_Procedure_Call_Statement =>
|
372 |
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Expand_N_Procedure_Call_Statement (N);
|
373 |
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374 |
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when N_Protected_Type_Declaration =>
|
375 |
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Expand_N_Protected_Type_Declaration (N);
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376 |
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|
377 |
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when N_Protected_Body =>
|
378 |
|
|
Expand_N_Protected_Body (N);
|
379 |
|
|
|
380 |
|
|
when N_Qualified_Expression =>
|
381 |
|
|
Expand_N_Qualified_Expression (N);
|
382 |
|
|
|
383 |
|
|
when N_Quantified_Expression =>
|
384 |
|
|
Expand_N_Quantified_Expression (N);
|
385 |
|
|
|
386 |
|
|
when N_Raise_Statement =>
|
387 |
|
|
Expand_N_Raise_Statement (N);
|
388 |
|
|
|
389 |
|
|
when N_Raise_Constraint_Error =>
|
390 |
|
|
Expand_N_Raise_Constraint_Error (N);
|
391 |
|
|
|
392 |
|
|
when N_Raise_Program_Error =>
|
393 |
|
|
Expand_N_Raise_Program_Error (N);
|
394 |
|
|
|
395 |
|
|
when N_Raise_Storage_Error =>
|
396 |
|
|
Expand_N_Raise_Storage_Error (N);
|
397 |
|
|
|
398 |
|
|
when N_Real_Literal =>
|
399 |
|
|
Expand_N_Real_Literal (N);
|
400 |
|
|
|
401 |
|
|
when N_Record_Representation_Clause =>
|
402 |
|
|
Expand_N_Record_Representation_Clause (N);
|
403 |
|
|
|
404 |
|
|
when N_Requeue_Statement =>
|
405 |
|
|
Expand_N_Requeue_Statement (N);
|
406 |
|
|
|
407 |
|
|
when N_Simple_Return_Statement =>
|
408 |
|
|
Expand_N_Simple_Return_Statement (N);
|
409 |
|
|
|
410 |
|
|
when N_Selected_Component =>
|
411 |
|
|
Expand_N_Selected_Component (N);
|
412 |
|
|
|
413 |
|
|
when N_Selective_Accept =>
|
414 |
|
|
Expand_N_Selective_Accept (N);
|
415 |
|
|
|
416 |
|
|
when N_Single_Task_Declaration =>
|
417 |
|
|
Expand_N_Single_Task_Declaration (N);
|
418 |
|
|
|
419 |
|
|
when N_Slice =>
|
420 |
|
|
Expand_N_Slice (N);
|
421 |
|
|
|
422 |
|
|
when N_Subtype_Indication =>
|
423 |
|
|
Expand_N_Subtype_Indication (N);
|
424 |
|
|
|
425 |
|
|
when N_Subprogram_Body =>
|
426 |
|
|
Expand_N_Subprogram_Body (N);
|
427 |
|
|
|
428 |
|
|
when N_Subprogram_Body_Stub =>
|
429 |
|
|
Expand_N_Subprogram_Body_Stub (N);
|
430 |
|
|
|
431 |
|
|
when N_Subprogram_Declaration =>
|
432 |
|
|
Expand_N_Subprogram_Declaration (N);
|
433 |
|
|
|
434 |
|
|
when N_Subprogram_Info =>
|
435 |
|
|
Expand_N_Subprogram_Info (N);
|
436 |
|
|
|
437 |
|
|
when N_Task_Body =>
|
438 |
|
|
Expand_N_Task_Body (N);
|
439 |
|
|
|
440 |
|
|
when N_Task_Type_Declaration =>
|
441 |
|
|
Expand_N_Task_Type_Declaration (N);
|
442 |
|
|
|
443 |
|
|
when N_Timed_Entry_Call =>
|
444 |
|
|
Expand_N_Timed_Entry_Call (N);
|
445 |
|
|
|
446 |
|
|
when N_Type_Conversion =>
|
447 |
|
|
Expand_N_Type_Conversion (N);
|
448 |
|
|
|
449 |
|
|
when N_Unchecked_Expression =>
|
450 |
|
|
Expand_N_Unchecked_Expression (N);
|
451 |
|
|
|
452 |
|
|
when N_Unchecked_Type_Conversion =>
|
453 |
|
|
Expand_N_Unchecked_Type_Conversion (N);
|
454 |
|
|
|
455 |
|
|
when N_Variant_Part =>
|
456 |
|
|
Expand_N_Variant_Part (N);
|
457 |
|
|
|
458 |
|
|
-- For all other node kinds, no expansion activity required
|
459 |
|
|
|
460 |
|
|
when others =>
|
461 |
|
|
null;
|
462 |
|
|
|
463 |
|
|
end case;
|
464 |
|
|
end if;
|
465 |
|
|
|
466 |
|
|
exception
|
467 |
|
|
when RE_Not_Available =>
|
468 |
|
|
return;
|
469 |
|
|
end;
|
470 |
|
|
|
471 |
|
|
-- Set result as analyzed and then do a possible transient wrap. The
|
472 |
|
|
-- transient wrap must be done after the Analyzed flag is set on, so
|
473 |
|
|
-- that we do not get a recursive attempt to expand the node N.
|
474 |
|
|
|
475 |
|
|
Set_Analyzed (N);
|
476 |
|
|
|
477 |
|
|
-- Deal with transient scopes
|
478 |
|
|
|
479 |
|
|
if Scope_Is_Transient and then N = Node_To_Be_Wrapped then
|
480 |
|
|
case Nkind (N) is
|
481 |
|
|
when N_Statement_Other_Than_Procedure_Call |
|
482 |
|
|
N_Procedure_Call_Statement =>
|
483 |
|
|
Wrap_Transient_Statement (N);
|
484 |
|
|
|
485 |
|
|
when N_Object_Declaration |
|
486 |
|
|
N_Object_Renaming_Declaration |
|
487 |
|
|
N_Subtype_Declaration =>
|
488 |
|
|
Wrap_Transient_Declaration (N);
|
489 |
|
|
|
490 |
|
|
when others => Wrap_Transient_Expression (N);
|
491 |
|
|
end case;
|
492 |
|
|
end if;
|
493 |
|
|
|
494 |
|
|
Debug_A_Exit ("expanding ", N, " (done)");
|
495 |
|
|
end if;
|
496 |
|
|
end Expand;
|
497 |
|
|
|
498 |
|
|
---------------------------
|
499 |
|
|
-- Expander_Mode_Restore --
|
500 |
|
|
---------------------------
|
501 |
|
|
|
502 |
|
|
procedure Expander_Mode_Restore is
|
503 |
|
|
begin
|
504 |
|
|
-- Not active (has no effect) in ASIS mode (see comments in spec of
|
505 |
|
|
-- Expander_Mode_Save_And_Set).
|
506 |
|
|
|
507 |
|
|
if ASIS_Mode then
|
508 |
|
|
return;
|
509 |
|
|
end if;
|
510 |
|
|
|
511 |
|
|
-- Otherwise restore the flag
|
512 |
|
|
|
513 |
|
|
Expander_Active := Expander_Flags.Table (Expander_Flags.Last);
|
514 |
|
|
Expander_Flags.Decrement_Last;
|
515 |
|
|
|
516 |
|
|
-- Keep expander off if serious errors detected. In this case we do not
|
517 |
|
|
-- need expansion, and continued expansion may cause cascaded errors or
|
518 |
|
|
-- compiler bombs.
|
519 |
|
|
|
520 |
|
|
if Serious_Errors_Detected /= 0 then
|
521 |
|
|
Expander_Active := False;
|
522 |
|
|
end if;
|
523 |
|
|
end Expander_Mode_Restore;
|
524 |
|
|
|
525 |
|
|
--------------------------------
|
526 |
|
|
-- Expander_Mode_Save_And_Set --
|
527 |
|
|
--------------------------------
|
528 |
|
|
|
529 |
|
|
procedure Expander_Mode_Save_And_Set (Status : Boolean) is
|
530 |
|
|
begin
|
531 |
|
|
-- Not active (has no effect) in ASIS mode (see comments in spec of
|
532 |
|
|
-- Expander_Mode_Save_And_Set).
|
533 |
|
|
|
534 |
|
|
if ASIS_Mode then
|
535 |
|
|
return;
|
536 |
|
|
end if;
|
537 |
|
|
|
538 |
|
|
-- Otherwise save and set the flag
|
539 |
|
|
|
540 |
|
|
Expander_Flags.Increment_Last;
|
541 |
|
|
Expander_Flags.Table (Expander_Flags.Last) := Expander_Active;
|
542 |
|
|
Expander_Active := Status;
|
543 |
|
|
end Expander_Mode_Save_And_Set;
|
544 |
|
|
|
545 |
|
|
end Expander;
|