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------------------------------------------------------------------------------
-- --
-- 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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;
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