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annotate src/expr.h @ 13:05d4115b4860

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Started work on new expression evaluator system and major code re-work for next release
author lost
date Wed, 22 Oct 2008 04:51:16 +0000
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1 /*
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2 expr.h
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3 Copyright © 2008 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 This file contains definitions associated with the expression evaluator used
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23 by LWASM.
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24
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25 The core of the entire expression handler is the opaque type LWVAL, pointers
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26 to which are passed around to keep track of values. A value may be a simple
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27 integer or it could be a more complex expression linked by operators or it
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28 could be a polynomial expression. Simple integers are merely a degenerate
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29 case of polynomials.
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30
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31 The package understands the following operations:
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32
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33 addition
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34 subtraction
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35 multiplication
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36 division
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37 modulus
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38 parentheses
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39 unary negation
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40 unary "positive"
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41 bitwise and
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42 bitwise or
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43 bitwise not (1's complement)
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44 bitwise exclusive or
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45
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46 Infix operators can be expressed as LWVAL <op> LWVAL. Thus, the order of
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47 operations is only relevant when initially parsing the expression. The order
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48 of evaluation is determined by what appears on either side of the <op> as
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49 an LWVAL may be an expression.
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50 */
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51
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52 typedef union lwval LWVAL;
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53
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54 struct lwval_int
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55 {
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56 int lwval_type; // type of value
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57 int lwval_int_value; // integer value
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58 };
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59
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60 union lwval
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61 {
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62 struct lwval_int lwval_type_int; // integer type
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63 };
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64
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65 enum lwval_types
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66 {
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67 LWVAL_TYPE_INT
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68 };
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69
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70 #ifndef __expr_h_seen__
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71 #define __expr_h_seen__
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72
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73
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74
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75 #endif //__expr_h_seen__