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Started adding expression handling infrastructure
author lost
date Thu, 01 Jan 2009 02:26:26 +0000
parents 1f598d89b9b0
children 218aabbc3b1a
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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 Definitions for expression evaluator
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23 */
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24
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25 #ifndef __expr_h_seen__
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26 #define __expr_h_seen__
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27
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28 #ifndef __expr_c_seen__
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29 #define __expr_E__ extern
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30 #else
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31 #define __expr_E__
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32 #endif
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33
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34 // term types
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35 #define LWASM_TERM_NONE 0
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36 #define LWASM_TERM_OPER 1 // an operator
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37 #define LWASM_TERM_INT 2 // 32 bit signed integer
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38 #define LWASM_TERM_SYM 3 // symbol reference
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39
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40 // operator types
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41 #define LWASM_OPER_NONE 0
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42 #define LWASM_OPER_PLUS 1 // +
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43 #define LWASM_OPER_MINUS 2 // -
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44 #define LWASM_OPER_TIMES 3 // *
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45 #define LWASM_OPER_DIVIDE 4 // /
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46 #define LWASM_OPER_MOD 5 // %
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47 #define LWASM_OPER_INTDIV 6 // \
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48 #define LWASM_OPER_BWAND 7 // bitwise AND
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49 #define LWASM_OPER_BWOR 8 // bitwise OR
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50 #define LWASM_OPER_BWXOR 9 // bitwise XOR
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51 #define LWASM_OPER_AND 10 // boolean AND
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52 #define LWASM_OPER_OR 11 // boolean OR
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53 #define LWASM_OPER_NEG 12 // unary negation (2's complement)
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54 #define LWASM_OPER_COM 13 // unary 1's complement
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57 // term structure
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58 typedef struct lwasm_expr_term_s
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59 {
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60 int term_type; // type of term (see above)
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61 char *symbol; // name of a symbol
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62 int value; // value of the term (int) or operator number (OPER)
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63 } lwasm_expr_term_t;
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64
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65 // type for an expression evaluation stack
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66 typedef struct lwasm_expr_stack_node_s lwasm_expr_stack_node_t;
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67 struct lwasm_expr_stack_node_s
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68 {
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69 lwasm_expr_term_t *term;
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70 lwasm_expr_stack_node_t *prev;
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71 lwasm_expr_stack_node_t *next;
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72 };
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73
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74 typedef struct lwasm_expr_stack_s
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75 {
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76 lwasm_expr_stack_node_t *head;
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77 lwasm_expr_stack_node_t *tail;
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78 } lwasm_expr_stack_t;
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79
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80 __expr_E__ void lwasm_expr_term_free(lwasm_expr_term_t *t);
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81 __expr_E__ lwasm_expr_term_t *lwasm_expr_term_create_oper(int oper);
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82 __expr_E__ lwasm_expr_term_t *lwasm_expr_term_create_sym(char *sym);
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83 __expr_E__ lwasm_expr_term_t *lwasm_expr_term_create_int(int val);
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84 __expr_E__ lwasm_expr_term_t *lwasm_expr_term_dup(lwasm_expr_term_t *t);
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85
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86 __expr_E__ void lwasm_expr_stack_free(lwasm_expr_stack_t *s);
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87 __expr_E__ lwasm_expr_stack_t *lwasm_expr_stack_create(void);
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88
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89 __expr_E__ void lwasm_expr_stack_push(lwasm_expr_stack_t *s, lwasm_expr_term_t *t);
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90 __expr_E__ lwasm_expr_term_t *lwasm_expr_stack_pop(lwasm_expr_stack_t *s);
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91
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92 #undef __expr_E__
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93
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94 #endif // __expr_h_seen__