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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             E X P _ C O D E                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1996-2007, 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.      --

--                                                                          --

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--  Processing for handling code statements

with Types; use Types;

with System; use System;

package Exp_Code is

   procedure Expand_Asm_Call (N : Node_Id);

   --  Expands a call to Asm into an equivalent N_Code_Statement node

   --  The following routines provide an abstract interface to analyze

   --  code statements, for use by Gigi processing for code statements.

   --  Note that the implementations of these routines must not attempt

   --  to expand tables that are frozen on entry to Gigi.

   function Is_Asm_Volatile (N : Node_Id) return Boolean;

   --  Given an N_Code_Statement node N, return True if Volatile=True is

   --  specified, and False if Volatile=False is specified (or set by default).

   function Asm_Template (N : Node_Id) return Node_Id;

   --  Given an N_Code_Statement node N, returns string literal node for

   --  template in call

   procedure Clobber_Setup (N : Node_Id);

   --  Given an N_Code_Statement node N, setup to process the clobber list

   --  with subsequent calls to Clobber_Get_Next.

   function Clobber_Get_Next return System.Address;

   --  Can only be called after a previous call to Clobber_Setup. The

   --  returned value is a pointer to a null terminated (C format) string

   --  for the next register argument. Null_Address is returned when there

   --  are no more arguments.

   procedure Setup_Asm_Inputs (N : Node_Id);

   --  Given an N_Code_Statement node N, setup to read list of Asm_Input

   --  arguments. The protocol is to construct a loop as follows:

   --

   --    Setup_Asm_Inputs (N);

   --    while Present (Asm_Input_Value)

   --      body

   --      Next_Asm_Input;

   --    end loop;

   --

   --  where the loop body calls Asm_Input_Constraint or Asm_Input_Value to

   --  obtain the constraint string or input value expression from the current

   --  Asm_Input argument.

   function Asm_Input_Constraint return Node_Id;

   --  Called within a loop initialized by Setup_Asm_Inputs and controlled

   --  by Next_Asm_Input as described above. Returns a string literal node

   --  for the constraint component of the current Asm_Input_Parameter, or

   --  Empty if there are no more Asm_Input parameters.

   function Asm_Input_Value return Node_Id;

   --  Called within a loop initialized by Setup_Asm_Inputs and controlled

   --  by Next_Asm_Input as described above. Returns the expression node for

   --  the value component of the current Asm_Input parameter, or Empty if

   --  there are no more Asm_Input parameters, or Error if an error was

   --  previously detected in the input parameters (note that the backend

   --  need not worry about this case, since it won't be called if there

   --  were any such serious errors detected).

   procedure Next_Asm_Input;

   --  Step to next Asm_Input parameter. It is an error to call this procedure

   --  if there are no more available parameters (which is impossible if the

   --  call appears in a loop as in the above example).

   procedure Setup_Asm_Outputs (N : Node_Id);

   --  Given an N_Code_Statement node N, setup to read list of Asm_Output

   --  arguments. The protocol is to construct a loop as follows:

   --

   --    Setup_Asm_Outputs (N);

   --    while Present (Asm_Output_Variable)

   --      body

   --      Next_Asm_Output;

   --    end loop;

   --

   --  where the loop body calls Asm_Output_Constraint or Asm_Output_Variable

   --  to obtain the constraint string or output variable name from the current

   --  Asm_Output argument.

   function Asm_Output_Constraint return Node_Id;

   --  Called within a loop initialized by Setup_Asm_Outputs and controlled

   --  by Next_Asm_Output as described above. Returns a string literal node

   --  for the constraint component of the current Asm_Output_Parameter, or

   --  Empty if there are no more Asm_Output parameters.

   function Asm_Output_Variable return Node_Id;

   --  Called within a loop initialized by Setup_Asm_Outputs and controlled by

   --  Next_Asm_Output as described above. Returns the expression node for the

   --  output variable component of the current Asm_Output parameter, or Empty

   --  if there are no more Asm_Output parameters, or Error if an error was

   --  previously detected in the input parameters (note that the backend need

   --  not worry about this case, since it won't be called if there were any

   --  such serious errors detected).

   procedure Next_Asm_Output;

   --  Step to next Asm_Output parameter. It is an error to call this procedure

   --  if there are no more available parameters (which is impossible if the

   --  call appears in a loop as in the above example).

end Exp_Code;