+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- L A Y O U T --
--- --
--- S p e c --
--- --
--- $Revision: 1.2.12.1 $
--- --
--- Copyright (C) 2000-2001 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 2, 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 COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package does front-end layout of types and objects. The result is
--- to annotate the tree with information on size and alignment of types
--- and objects. How much layout is performed depends on the setting of the
--- target dependent parameter Backend_Layout.
-
-with Types; use Types;
-
-package Layout is
-
- -- The following procedures are called from Freeze, so all entities
- -- for types and objects that get frozen (which should be all such
- -- entities which are seen by the back end) will get layed out by one
- -- of these two procedures.
-
- procedure Layout_Type (E : Entity_Id);
- -- This procedure may set or adjust the fields Esize, RM_Size and
- -- Alignment in the non-generic type or subtype entity E. If the
- -- Backend_Layout switch is False, then it is guaranteed that all
- -- three fields will be properly set on return. Regardless of the
- -- Backend_Layout value, it is guaranteed that all discrete types
- -- will have both Esize and RM_Size fields set on return (since
- -- these are static values). Note that Layout_Type is not called
- -- for generic types, since these play no part in code generation,
- -- and hence representation aspects are irrelevant.
-
- procedure Layout_Object (E : Entity_Id);
- -- E is either a variable (E_Variable), a constant (E_Constant),
- -- a loop parameter (E_Loop_Parameter), or a formal parameter of
- -- a non-generic subprogram (E_In_Parameter, E_In_Out_Parameter,
- -- or E_Out_Parameter). This procedure may set or adjust the
- -- Esize and Alignment fields of E. If Backend_Layout is False,
- -- then it is guaranteed that both fields will be properly set
- -- on return. If the Esize is still unknown in the latter case,
- -- it means that the object must be allocated dynamically, since
- -- its length is not known at compile time.
-
- procedure Set_Discrete_RM_Size (Def_Id : Entity_Id);
- -- Set proper RM_Size for discrete size, this is normally the minimum
- -- number of bits to accommodate the range given, except in the case
- -- where the subtype statically matches the first subtype, in which
- -- case the size must be copied from the first subtype. For generic
- -- types, the RM_Size is simply set to zero. This routine also sets
- -- the Is_Constrained flag in Def_Id.
-
- procedure Set_Prim_Alignment (E : Entity_Id);
- -- The front end always sets alignments for primitive types by calling this
- -- procedure. Note that we have to do this for discrete types (since the
- -- Alignment attribute is static), so we might as well do it for all
- -- scalar types, since the processing is the same.
-
-end Layout;
projects / msp430-gcc.git / blobdiff