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annotate lwlib/lw_expr.h @ 339:6138e304ab9a

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Revert 3b5a45c6ab92 The speedup fix in 3b5a45c6ab92 contains some sort of bug related to operand manipulation during expression simplification or copying. This leads to crashes that so have have eluded tracing. Revert back to known working version of the code, even though slower, to avoid regressions.
author William Astle <lost@l-w.ca>
date Fri, 08 Aug 2014 12:14:22 -0600
parents 3b5a45c6ab92
children 4130ffdeb5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 lwexpr.h
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #ifndef ___lw_expr_h_seen___
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23 #define ___lw_expr_h_seen___
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24
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25 #include <stdio.h>
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26
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27 enum
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28 {
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29 lw_expr_type_oper, // operator term
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30 lw_expr_type_int, // integer
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31 lw_expr_type_var, // a "variable" (string for the name)
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32 lw_expr_type_special // a "special" reference (user defined)
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33 };
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34
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35 enum
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36 {
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37 lw_expr_oper_plus = 1, // addition
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38 lw_expr_oper_minus, // subtraction
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39 lw_expr_oper_times, // multiplication
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40 lw_expr_oper_divide, // division
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41 lw_expr_oper_mod, // modulus
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42 lw_expr_oper_intdiv, // integer division
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43 lw_expr_oper_bwand, // bitwise and
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44 lw_expr_oper_bwor, // bitwise or
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45 lw_expr_oper_bwxor, // bitwise xor
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46 lw_expr_oper_and, // boolean and
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47 lw_expr_oper_or, // boolean or
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48 lw_expr_oper_neg, // unary negation, 2's complement
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49 lw_expr_oper_com, // unary 1's complement
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50 lw_expr_oper_none = 0
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51 };
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52
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53 #ifdef ___lw_expr_c_seen___
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54
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55 typedef struct lw_expr_priv * lw_expr_t;
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56
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57 struct lw_expr_opers
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58 {
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59 lw_expr_t p;
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60 struct lw_expr_opers *next;
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61 };
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62
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63 struct lw_expr_priv
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64 {
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65 int type; // type of term
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66 int value; // integer value
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67 void *value2; // misc pointer value
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68 struct lw_expr_opers *operands; // ptr to list of operands (for operators)
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69 };
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70
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71 typedef lw_expr_t lw_expr_fn_t(int t, void *ptr, void *priv);
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72 typedef lw_expr_t lw_expr_fn2_t(char *var, void *priv);
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73 typedef lw_expr_t lw_expr_fn3_t(char **p, void *priv);
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74 typedef int lw_expr_testfn_t(lw_expr_t e, void *priv);
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75
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76 #else /* def ___lw_expr_c_seen___ */
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77
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78 typedef void * lw_expr_t;
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79
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80 extern lw_expr_t lwexpr_create(void);
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81 extern void lw_expr_destroy(lw_expr_t E);
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82 extern lw_expr_t lw_expr_copy(lw_expr_t E);
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83 extern void lw_expr_add_operand(lw_expr_t E, lw_expr_t O);
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84 extern lw_expr_t lw_expr_build(int exprtype, ...);
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85 extern char *lw_expr_print(lw_expr_t E);
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86 extern int lw_expr_compare(lw_expr_t E1, lw_expr_t E2);
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87 extern void lw_expr_simplify(lw_expr_t E, void *priv);
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88
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89 typedef lw_expr_t lw_expr_fn_t(int t, void *ptr, void *priv);
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90 typedef lw_expr_t lw_expr_fn2_t(char *var, void *priv);
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91 typedef lw_expr_t lw_expr_fn3_t(char **p, void *priv);
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92
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93 extern void lw_expr_set_special_handler(lw_expr_fn_t *fn);
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94 extern void lw_expr_set_var_handler(lw_expr_fn2_t *fn);
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95 extern void lw_expr_set_term_parser(lw_expr_fn3_t *fn);
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96
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97 extern lw_expr_t lw_expr_parse(char **p, void *priv);
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98 extern int lw_expr_istype(lw_expr_t e, int t);
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99 extern int lw_expr_intval(lw_expr_t e);
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100 extern int lw_expr_specint(lw_expr_t e);
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101 extern void *lw_expr_specptr(lw_expr_t e);
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102 extern int lw_expr_whichop(lw_expr_t e);
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103
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104 extern int lw_expr_type(lw_expr_t e);
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105
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106 typedef int lw_expr_testfn_t(lw_expr_t e, void *priv);
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107
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108 extern int lw_expr_operandcount(lw_expr_t e);
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109
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110 // run a function on all terms in an expression; if the function
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111 // returns non-zero for any term, return non-zero, else return
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112 // zero
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113 extern int lw_expr_testterms(lw_expr_t e, lw_expr_testfn_t *fn, void *priv);
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114
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115 extern void lw_expr_setdivzero(void (*fn)(void *priv));
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116
0
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117 #endif /* def ___lw_expr_c_seen___ */
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118
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119 #endif /* ___lw_expr_h_seen___ */