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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                               L A Y O U T                                --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2000-2007, 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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--  This package does front-end layout of types and objects. The result is
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--  to annotate the tree with information on size and alignment of types
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--  and objects. How much layout is performed depends on the setting of the
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--  target dependent parameter Backend_Layout.
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with Types; use Types;
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package Layout is
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   --  The following procedures are called from Freeze, so all entities
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   --  for types and objects that get frozen (which should be all such
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   --  entities which are seen by the back end) will get layed out by one
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   --  of these two procedures.
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   procedure Layout_Type (E : Entity_Id);
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   --  This procedure may set or adjust the fields Esize, RM_Size and
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   --  Alignment in the non-generic type or subtype entity E. If the
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   --  Backend_Layout switch is False, then it is guaranteed that all
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   --  three fields will be properly set on return. Regardless of the
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   --  Backend_Layout value, it is guaranteed that all discrete types
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   --  will have both Esize and RM_Size fields set on return (since
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   --  these are static values). Note that Layout_Type is not called
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   --  for generic types, since these play no part in code generation,
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   --  and hence representation aspects are irrelevant.
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   procedure Layout_Object (E : Entity_Id);
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   --  E is either a variable (E_Variable), a constant (E_Constant),
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   --  a loop parameter (E_Loop_Parameter), or a formal parameter of
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   --  a non-generic subprogram (E_In_Parameter, E_In_Out_Parameter,
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   --  or E_Out_Parameter). This procedure may set or adjust the
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   --  Esize and Alignment fields of E. If Backend_Layout is False,
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   --  then it is guaranteed that both fields will be properly set
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   --  on return. If the Esize is still unknown in the latter case,
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   --  it means that the object must be allocated dynamically, since
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   --  its length is not known at compile time.
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   --  The following are utility routines, called from various places
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   procedure Adjust_Esize_Alignment (E : Entity_Id);
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   --  E is the entity for a type or object. This procedure checks that the
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   --  size and alignment are compatible, and if not either gives an error
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   --  message if they cannot be adjusted or else adjusts them appropriately.
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   procedure Set_Discrete_RM_Size (Def_Id : Entity_Id);
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   --  Set proper RM_Size for discrete size, this is normally the minimum
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   --  number of bits to accommodate the range given, except in the case
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   --  where the subtype statically matches the first subtype, in which
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   --  case the size must be copied from the first subtype. For generic
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   --  types, the RM_Size is simply set to zero. This routine also sets
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   --  the Is_Constrained flag in Def_Id.
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   procedure Set_Elem_Alignment (E : Entity_Id);
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   --  The front end always sets alignments for elementary types by calling
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   --  this procedure. Note that we have to do this for discrete types (since
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   --  the Alignment attribute is static), so we might as well do it for all
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   --  elementary types, since the processing is the same.
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end Layout;

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