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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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--                             E X P _ C O D E                              --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1996-2007, 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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--  Processing for handling code statements
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with Types; use Types;
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with System; use System;
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package Exp_Code is
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   procedure Expand_Asm_Call (N : Node_Id);
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   --  Expands a call to Asm into an equivalent N_Code_Statement node
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   --  The following routines provide an abstract interface to analyze
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   --  code statements, for use by Gigi processing for code statements.
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   --  Note that the implementations of these routines must not attempt
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   --  to expand tables that are frozen on entry to Gigi.
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   function Is_Asm_Volatile (N : Node_Id) return Boolean;
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   --  Given an N_Code_Statement node N, return True if Volatile=True is
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   --  specified, and False if Volatile=False is specified (or set by default).
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   function Asm_Template (N : Node_Id) return Node_Id;
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   --  Given an N_Code_Statement node N, returns string literal node for
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   --  template in call
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   procedure Clobber_Setup (N : Node_Id);
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   --  Given an N_Code_Statement node N, setup to process the clobber list
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   --  with subsequent calls to Clobber_Get_Next.
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   function Clobber_Get_Next return System.Address;
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   --  Can only be called after a previous call to Clobber_Setup. The
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   --  returned value is a pointer to a null terminated (C format) string
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   --  for the next register argument. Null_Address is returned when there
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   --  are no more arguments.
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   procedure Setup_Asm_Inputs (N : Node_Id);
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   --  Given an N_Code_Statement node N, setup to read list of Asm_Input
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   --  arguments. The protocol is to construct a loop as follows:
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   --
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   --    Setup_Asm_Inputs (N);
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   --    while Present (Asm_Input_Value)
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   --      body
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   --      Next_Asm_Input;
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   --    end loop;
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   --
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   --  where the loop body calls Asm_Input_Constraint or Asm_Input_Value to
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   --  obtain the constraint string or input value expression from the current
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   --  Asm_Input argument.
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   function Asm_Input_Constraint return Node_Id;
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   --  Called within a loop initialized by Setup_Asm_Inputs and controlled
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   --  by Next_Asm_Input as described above. Returns a string literal node
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   --  for the constraint component of the current Asm_Input_Parameter, or
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   --  Empty if there are no more Asm_Input parameters.
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   function Asm_Input_Value return Node_Id;
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   --  Called within a loop initialized by Setup_Asm_Inputs and controlled
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   --  by Next_Asm_Input as described above. Returns the expression node for
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   --  the value component of the current Asm_Input parameter, or Empty if
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   --  there are no more Asm_Input parameters, or Error if an error was
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   --  previously detected in the input parameters (note that the backend
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   --  need not worry about this case, since it won't be called if there
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   --  were any such serious errors detected).
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   procedure Next_Asm_Input;
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   --  Step to next Asm_Input parameter. It is an error to call this procedure
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   --  if there are no more available parameters (which is impossible if the
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   --  call appears in a loop as in the above example).
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   procedure Setup_Asm_Outputs (N : Node_Id);
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   --  Given an N_Code_Statement node N, setup to read list of Asm_Output
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   --  arguments. The protocol is to construct a loop as follows:
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   --
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   --    Setup_Asm_Outputs (N);
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   --    while Present (Asm_Output_Variable)
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   --      body
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   --      Next_Asm_Output;
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   --    end loop;
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   --
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   --  where the loop body calls Asm_Output_Constraint or Asm_Output_Variable
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   --  to obtain the constraint string or output variable name from the current
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   --  Asm_Output argument.
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   function Asm_Output_Constraint return Node_Id;
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   --  Called within a loop initialized by Setup_Asm_Outputs and controlled
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   --  by Next_Asm_Output as described above. Returns a string literal node
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   --  for the constraint component of the current Asm_Output_Parameter, or
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   --  Empty if there are no more Asm_Output parameters.
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   function Asm_Output_Variable return Node_Id;
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   --  Called within a loop initialized by Setup_Asm_Outputs and controlled by
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   --  Next_Asm_Output as described above. Returns the expression node for the
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   --  output variable component of the current Asm_Output parameter, or Empty
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   --  if there are no more Asm_Output parameters, or Error if an error was
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   --  previously detected in the input parameters (note that the backend need
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   --  not worry about this case, since it won't be called if there were any
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   --  such serious errors detected).
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   procedure Next_Asm_Output;
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   --  Step to next Asm_Output parameter. It is an error to call this procedure
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   --  if there are no more available parameters (which is impossible if the
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   --  call appears in a loop as in the above example).
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end Exp_Code;

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