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annotate lwlib/lw_expr.h @ 577:e49d24f4a9a5

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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents 6153cb49403c
children
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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 #ifdef _MSC_VER
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28 #include "lw_win.h" // windows build
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29 #endif
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30
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31 enum
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32 {
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33 lw_expr_type_oper, // operator term
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34 lw_expr_type_int, // integer
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35 lw_expr_type_var, // a "variable" (string for the name)
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36 lw_expr_type_special // a "special" reference (user defined)
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37 };
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38
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39 enum
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40 {
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41 lw_expr_oper_plus = 1, // addition
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42 lw_expr_oper_minus, // subtraction
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43 lw_expr_oper_times, // multiplication
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44 lw_expr_oper_divide, // division
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45 lw_expr_oper_mod, // modulus
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46 lw_expr_oper_intdiv, // integer division
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47 lw_expr_oper_bwand, // bitwise and
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48 lw_expr_oper_bwor, // bitwise or
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49 lw_expr_oper_bwxor, // bitwise xor
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50 lw_expr_oper_and, // boolean and
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51 lw_expr_oper_or, // boolean or
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52 lw_expr_oper_neg, // unary negation, 2's complement
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53 lw_expr_oper_com, // unary 1's complement
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54 lw_expr_oper_com8, // 8 bit complement
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55 lw_expr_oper_none = 0
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56 };
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57
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58 typedef struct lw_expr_priv * lw_expr_t;
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59
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60 struct lw_expr_opers
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61 {
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62 lw_expr_t p;
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63 struct lw_expr_opers *next;
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64 };
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65
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66 struct lw_expr_priv
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67 {
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68 int type; // type of term
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69 int value; // integer value
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70 void *value2; // misc pointer value
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71 struct lw_expr_opers *operands; // ptr to list of operands (for operators)
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72 };
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73
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74 typedef lw_expr_t lw_expr_fn_t(int t, void *ptr, void *priv);
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75 typedef lw_expr_t lw_expr_fn2_t(char *var, void *priv);
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76 typedef lw_expr_t lw_expr_fn3_t(char **p, void *priv);
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77 typedef int lw_expr_testfn_t(lw_expr_t e, void *priv);
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78
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79 lw_expr_t lwexpr_create(void);
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80 void lw_expr_destroy(lw_expr_t E);
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81 lw_expr_t lw_expr_copy(lw_expr_t E);
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82 void lw_expr_add_operand(lw_expr_t E, lw_expr_t O);
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83 lw_expr_t lw_expr_build(int exprtype, ...);
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84 char *lw_expr_print(lw_expr_t E);
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85 int lw_expr_compare(lw_expr_t E1, lw_expr_t E2);
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86 void lw_expr_simplify(lw_expr_t E, void *priv);
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87
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88 void lw_expr_set_special_handler(lw_expr_fn_t *fn);
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89 void lw_expr_set_var_handler(lw_expr_fn2_t *fn);
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90 void lw_expr_set_term_parser(lw_expr_fn3_t *fn);
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91
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92 lw_expr_t lw_expr_parse(char **p, void *priv);
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93 lw_expr_t lw_expr_parse_compact(char **p, void *priv);
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94 int lw_expr_istype(lw_expr_t e, int t);
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95 int lw_expr_intval(lw_expr_t e);
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96 int lw_expr_specint(lw_expr_t e);
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97 void *lw_expr_specptr(lw_expr_t e);
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98 int lw_expr_whichop(lw_expr_t e);
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99
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100 int lw_expr_type(lw_expr_t e);
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101
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102 int lw_expr_operandcount(lw_expr_t e);
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103
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104 void lw_expr_setwidth(int w);
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105
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106 // run a function on all terms in an expression; if the function
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107 // returns non-zero for any term, return non-zero, else return
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108 // zero
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109 int lw_expr_testterms(lw_expr_t e, lw_expr_testfn_t *fn, void *priv);
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110
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111 void lw_expr_setdivzero(void (*fn)(void *priv));
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112
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113 #endif /* ___lw_expr_h_seen___ */