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annotate lwasm/insn_bitbit.c @ 434:052c5f335a92

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Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
parents b20f14edda5a
children
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1 /*
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2 insn_bitbit.c
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3 Copyright © 2009 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 #include <stdlib.h>
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22 #include <ctype.h>
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23
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24 #include <lw_expr.h>
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25
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26 #include "lwasm.h"
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27 #include "instab.h"
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28
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29 // these instructions cannot tolerate external references
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30 PARSEFUNC(insn_parse_bitbit)
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31 {
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32 int r;
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33 lw_expr_t e;
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34 // int v1;
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35 // int tv;
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36
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37 r = toupper(*(*p)++);
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38 if (r == 'A')
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39 r = 1;
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40 else if (r == 'B')
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41 r = 2;
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42 else if (r == 'C' && toupper(**p) == 'C')
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43 {
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44 r = 0;
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45 (*p)++;
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46 }
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47 else
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48 {
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49 lwasm_register_error(as, l, E_REGISTER_BAD);
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50 return;
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51 }
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52 lwasm_skip_to_next_token(l, p);
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53 if (*(*p)++ != ',')
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54 {
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55 lwasm_register_error(as, l, E_OPERAND_BAD);
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56 return;
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57 }
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58 e = lwasm_parse_expr(as, p);
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59 if (!e)
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60 {
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61 lwasm_register_error(as, l, E_OPERAND_BAD);
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62 return;
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63 }
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64 lwasm_save_expr(l, 0, e);
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65 if (*(*p)++ != ',')
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66 {
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67 lwasm_register_error(as, l, E_OPERAND_BAD);
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68 return;
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69 }
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70
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71 e = lwasm_parse_expr(as, p);
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72 if (!e)
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73 {
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74 lwasm_register_error(as, l, E_OPERAND_BAD);
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75 return;
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76 }
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77 lwasm_save_expr(l, 1, e);
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78
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79 if (*(*p)++ != ',')
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80 {
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81 lwasm_register_error(as, l, E_OPERAND_BAD);
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82 return;
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83 }
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84 lwasm_skip_to_next_token(l, p);
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85 // ignore base page address modifier
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86 if (**p == '<')
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87 (*p)++;
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88
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89 e = lwasm_parse_expr(as, p);
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90 if (!e)
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91 {
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92 lwasm_register_error(as, l, E_OPERAND_BAD);
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93 return;
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94 }
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95 lwasm_save_expr(l, 2, e);
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96
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97 l -> lint = r;
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98 l -> len = OPLEN(instab[l -> insn].ops[0]) + 2;
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99 }
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100
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101 EMITFUNC(insn_emit_bitbit)
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102 {
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103 int v1, v2;
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104 lw_expr_t e;
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105
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106 e = lwasm_fetch_expr(l, 0);
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107 if (!lw_expr_istype(e, lw_expr_type_int))
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108 {
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109 lwasm_register_error(as, l, E_BITNUMBER_UNRESOLVED);
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110 return;
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111 }
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112 v1 = lw_expr_intval(e);
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113 if (v1 < 0 || v1 > 7)
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114 {
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115 lwasm_register_error(as, l, E_BITNUMBER_INVALID);
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116 v1 = 0;
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117 }
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118
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119 e = lwasm_fetch_expr(l, 1);
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120 if (!lw_expr_istype(e, lw_expr_type_int))
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121 {
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122 lwasm_register_error(as, l, E_BITNUMBER_UNRESOLVED);
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123 return;
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124 }
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125 v2 = lw_expr_intval(e);
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126 if (v2 < 0 || v2 > 7)
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127 {
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128 lwasm_register_error(as, l, E_BITNUMBER_INVALID);
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129 v2 = 0;
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130 }
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131 l -> pb = (l -> lint << 6) | (v1 << 3) | v2;
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132
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133 e = lwasm_fetch_expr(l, 2);
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134 if (lw_expr_istype(e, lw_expr_type_int))
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135 {
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136 v1 = lw_expr_intval(e) & 0xFFFF;
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137 v2 = v1 - ((l -> dpval) << 8);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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138 if (v2 > 0xFF || v2 < 0)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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139 {
370
8764142b3192 Convert internal error/warning handling framework to a new unified system
William Astle <lost@l-w.ca>
parents: 2
diff changeset
140 lwasm_register_error(as, l, E_BYTE_OVERFLOW);
0
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lost@l-w.ca
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141 return;
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142 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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143 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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144 lwasm_emitop(l, instab[l -> insn].ops[0]);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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145 lwasm_emit(l, l -> pb);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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146 lwasm_emitexpr(l, e, 1);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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147 }