+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S E M _ C H 1 3 --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001 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. --
--- --
-------------------------------------------------------------------------------
-
-with Snames; use Snames;
-with Types; use Types;
-with Uintp; use Uintp;
-
-package Sem_Ch13 is
- procedure Analyze_At_Clause (N : Node_Id);
- procedure Analyze_Attribute_Definition_Clause (N : Node_Id);
- procedure Analyze_Enumeration_Representation_Clause (N : Node_Id);
- procedure Analyze_Free_Statement (N : Node_Id);
- procedure Analyze_Record_Representation_Clause (N : Node_Id);
- procedure Analyze_Code_Statement (N : Node_Id);
-
- procedure Initialize;
- -- Initialize internal tables for new compilation
-
- procedure Set_Enum_Esize (T : Entity_Id);
- -- This routine sets the Esize field for an enumeration type T, based
- -- on the current representation information available for T. Note that
- -- the setting of the RM_Size field is not affected. This routine also
- -- initializes the alignment field to zero.
-
- function Minimum_Size
- (T : Entity_Id;
- Biased : Boolean := False)
- return Nat;
- -- Given a primitive type, determines the minimum number of bits required
- -- to represent all values of the type. This function may not be called
- -- with any other types. If the flag Biased is set True, then the minimum
- -- size calculation that biased representation is used in the case of a
- -- discrete type, e.g. the range 7..8 gives a minimum size of 4 with
- -- Biased set to False, and 1 with Biased set to True. Note that the
- -- biased parameter only has an effect if the type is not biased, it
- -- causes Minimum_Size to indicate the minimum size of an object with
- -- the given type, of the size the type would have if it were biased. If
- -- the type is already biased, then Minimum_Size returns the biased size,
- -- regardless of the setting of Biased. Also, fixed-point types are never
- -- biased in the current implementation.
-
- procedure Check_Size
- (N : Node_Id;
- T : Entity_Id;
- Siz : Uint;
- Biased : out Boolean);
- -- Called when size Siz is specified for subtype T. This subprogram checks
- -- that the size is appropriate, posting errors on node N as required.
- -- For non-elementary types, a check is only made if an explicit size
- -- has been given for the type (and the specified size must match). The
- -- parameter Biased is set False if the size specified did not require
- -- the use of biased representation, and True if biased representation
- -- was required to meet the size requirement. Note that Biased is only
- -- set if the type is not currently biased, but biasing it is the only
- -- way to meet the requirement. If the type is currently biased, then
- -- this biased size is used in the initial check, and Biased is False.
-
- function Get_Rep_Pragma (E : Entity_Id; Nam : Name_Id) return Node_Id;
- -- Searches the Rep_Item chain for the given entity E, for an instance
- -- of a representation pragma with the given name Nam. If found then
- -- the value returned is the N_Pragma node, otherwise Empty is returned.
-
- function Get_Attribute_Definition_Clause
- (E : Entity_Id;
- Id : Attribute_Id)
- return Node_Id;
- -- Searches the Rep_Item chain for a given entity E, for an instance
- -- of an attribute definition clause with the given attibute Id Id. If
- -- found, the value returned is the N_Attribute_Definition_Clause node,
- -- otherwise Empty is returned.
-
- procedure Record_Rep_Item (T : Entity_Id; N : Node_Id);
- -- N is the node for either a representation pragma or an attribute
- -- definition clause that applies to type T. This procedure links
- -- the node N onto the Rep_Item chain for the type T.
-
- function Rep_Item_Too_Early
- (T : Entity_Id;
- N : Node_Id)
- return Boolean;
- -- Called at the start of processing a representation clause or a
- -- representation pragma. Used to check that the representation item
- -- is not being applied to an incompleted type or to a generic formal
- -- type or a type derived from a generic formal type. Returns False if
- -- no such error occurs. If this error does occur, appropriate error
- -- messages are posted on node N, and True is returned.
-
- function Rep_Item_Too_Late
- (T : Entity_Id;
- N : Node_Id;
- FOnly : Boolean := False)
- return Boolean;
- -- Called at the start of processing a representation clause or a
- -- representation pragma. Used to check that a representation item
- -- for entity T does not appear too late (according to the rules in
- -- RM 13.1(9) and RM 13.1(10)). N is the associated node, which in
- -- the pragma case is the pragma or representation clause itself, used
- -- for placing error messages if the item is too late.
- --
- -- Fonly is a flag that causes only the freezing rule (para 9) to be
- -- applied, and the tests of para 10 are skipped. This is appropriate
- -- for both subtype related attributes (Alignment and Size) and for
- -- stream attributes, which, although certainly not subtype related
- -- attributes, clearly should not be subject to the para 10 restrictions
- -- (see AI95-00137). Similarly, we also skip the para 10 restrictions for
- -- the Storage_Size case where they also clearly do not apply.
- --
- -- If the rep item is too late, an appropriate message is output and
- -- True is returned, which is a signal that the caller should abandon
- -- processing for the item. If the item is not too late, then False
- -- is returned, and the caller can continue processing the item.
- --
- -- If no error is detected, this call also as a side effect links the
- -- representation item onto the head of the representation item chain
- -- (referenced by the First_Rep_Item field of the entity).
- --
- -- Note: Rep_Item_Too_Late must be called with the underlying type in
- -- the case of a private or incomplete type. The protocol is to first
- -- check for Rep_Item_Too_Early using the initial entity, then take the
- -- underlying type, then call Rep_Item_Too_Late on the result.
-
- function Same_Representation (Typ1, Typ2 : Entity_Id) return Boolean;
- -- Given two types, where the two types are related by possible derivation,
- -- determines if the two types have the same representation, or different
- -- representations, requiring the special processing for representation
- -- change. A False result is possible only for array, enumeration or
- -- record types.
-
- procedure Validate_Unchecked_Conversion
- (N : Node_Id;
- Act_Unit : Entity_Id);
- -- Validate a call to unchecked conversion. N is the node for the actual
- -- instantiation, which is used only for error messages. Act_Unit is the
- -- entity for the instantiation, from which the actual types etc for this
- -- instantiation can be determined. This procedure makes an entry in a
- -- table and/or generates an N_Validate_Unchecked_Conversion node. The
- -- actual checking is done in Validate_Unchecked_Conversions or in the
- -- back end as required.
-
- procedure Validate_Unchecked_Conversions;
- -- This routine is called after calling the backend to validate
- -- unchecked conversions for size and alignment appropriateness.
- -- The reason it is called that late is to take advantage of any
- -- back-annotation of size and alignment performed by the backend.
-
-end Sem_Ch13;
projects / msp430-gcc.git / blobdiff