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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [sem_case.ads] - Rev 320
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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S E M _ C A S E -- -- -- -- S p e c -- -- -- -- Copyright (C) 1996-2008, 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. -- -- -- ------------------------------------------------------------------------------ -- Package containing the routines to process a list of discrete choices. -- Such lists can occur in two different constructs: case statements and -- record variants. We have factorized what used to be two very similar -- sets of routines in one place. These are not currently used for the -- aggregate case, since issues with nested aggregates make that case -- substantially different. with Types; use Types; package Sem_Case is type Choice_Bounds is record Lo : Node_Id; Hi : Node_Id; Node : Node_Id; end record; type Choice_Table_Type is array (Pos range <>) of Choice_Bounds; -- Table type used to sort the choices present in a case statement, -- array aggregate or record variant. procedure No_OP (C : Node_Id); -- The no-operation routine. Does absolutely nothing. Can be used -- in the following generic for the parameter Process_Empty_Choice. generic with function Get_Alternatives (N : Node_Id) return List_Id; -- Function needed to get to the actual list of case statement -- alternatives, or array aggregate component associations or -- record variants from which we can then access the actual lists -- of discrete choices. N is the node for the original construct -- i.e. a case statement, an array aggregate or a record variant. with function Get_Choices (A : Node_Id) return List_Id; -- Given a case statement alternative, array aggregate component -- association or record variant A we need different access functions -- to get to the actual list of discrete choices. with procedure Process_Empty_Choice (Choice : Node_Id); -- Processing to carry out for an empty Choice with procedure Process_Non_Static_Choice (Choice : Node_Id); -- Processing to carry out for a non static Choice with procedure Process_Associated_Node (A : Node_Id); -- Associated to each case alternative, aggregate component -- association or record variant A there is a node or list of nodes -- that need semantic processing. This routine implements that -- processing. package Generic_Choices_Processing is function Number_Of_Choices (N : Node_Id) return Nat; -- Iterates through the choices of N, (N can be a case statement, -- array aggregate or record variant), counting all the Choice nodes -- except for the Others choice. procedure Analyze_Choices (N : Node_Id; Subtyp : Entity_Id; Choice_Table : out Choice_Table_Type; Last_Choice : out Nat; Raises_CE : out Boolean; Others_Present : out Boolean); -- From a case statement, array aggregate or record variant N, this -- routine analyzes the corresponding list of discrete choices. -- Subtyp is the subtype of the discrete choices. The type against -- which the discrete choices must be resolved is its base type. -- -- On entry Choice_Table must be big enough to contain all the discrete -- choices encountered. The lower bound of Choice_Table must be one. -- -- On exit Choice_Table contains all the static and non empty discrete -- choices in sorted order. Last_Choice gives the position of the last -- valid choice in Choice_Table, Choice_Table'First contains the first. -- We can have Last_Choice < Choice_Table'Last for one (or several) of -- the following reasons: -- -- (a) The list of choices contained a non static choice -- -- (b) The list of choices contained an empty choice -- (something like "1 .. 0 => ") -- -- (c) One of the bounds of a discrete choice contains an -- error or raises constraint error. -- -- In one of the bounds of a discrete choice raises a constraint -- error the flag Raise_CE is set. -- -- Finally Others_Present is set to True if an Others choice is present -- in the list of choices, and in this case the call also sets -- Others_Discrete_Choices in the N_Others_Choice node. end Generic_Choices_Processing; end Sem_Case;
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