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annotate lwlib/lw_expr.h @ 396:d0c0fede5021

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Update to gcc6809lw patch which may help compilation of some sources Due to persistent random compiler crashes and errors related to "M_REGS", this patch update (4.6.4-2) essentially removes the varius constraints allowing the "soft registers" in most operations. It was causing more problems than it solved and it is not clear that the logic behind those soft registers even makes sense any more. This patch also fixes a bogus comparison related to selecting the right size for a constant. Instead of the excessively clever comparison scheme that was previously in use, the comparisons have been replaced with straight forward comparisions for the top and bottom of the relevant 2's complement ranges.
author William Astle <lost@l-w.ca>
date Mon, 20 Jul 2015 22:32:41 -0600
parents 4c5d3b990a3f
children 6153cb49403c
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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 int lw_expr_istype(lw_expr_t e, int t);
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94 int lw_expr_intval(lw_expr_t e);
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95 int lw_expr_specint(lw_expr_t e);
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96 void *lw_expr_specptr(lw_expr_t e);
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97 int lw_expr_whichop(lw_expr_t e);
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98
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99 int lw_expr_type(lw_expr_t e);
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101 int lw_expr_operandcount(lw_expr_t e);
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102
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103 void lw_expr_setwidth(int w);
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104
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105 // run a function on all terms in an expression; if the function
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106 // returns non-zero for any term, return non-zero, else return
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107 // zero
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108 int lw_expr_testterms(lw_expr_t e, lw_expr_testfn_t *fn, void *priv);
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109
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110 void lw_expr_setdivzero(void (*fn)(void *priv));
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111
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112 #endif /* ___lw_expr_h_seen___ */