------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ C O D E -- -- -- -- S p e c -- -- -- -- -- -- Copyright (C) 1996 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. -- -- -- ------------------------------------------------------------------------------ -- 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 or Asm_Volatile 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 in the Asm_Volatile -- case and False in the Asm case. 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. 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_Value) -- 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. 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;