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131 lines
6.5 KiB
Ada
131 lines
6.5 KiB
Ada
------------------------------------------------------------------------------
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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) 1996-2022, 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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-- WARNING: There is a matching C declaration of these subprograms in fe.h
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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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pragma Convention (C, Clobber_Get_Next);
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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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