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annotate lwcc/tree.c @ 560:dba08c7dff96

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Fix off by one handling MOD directive optional arguments Fixes an off by one in handling the optional arguments to the MOD directive as of changeset 928c033c0cd0. Thanks to Alex Evans <varmfskii@gmail.com> for reporting the problem and a suggested fix. This fix is different but should be more stable should the rest of the parsing code be refactored in the future.
author William Astle <lost@l-w.ca>
date Fri, 22 Sep 2023 12:15:09 -0600
parents 7e8298f7bc0a
children
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1 /*
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2 lwcc/tree.c
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3
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4 Copyright © 2013 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 #include <stdarg.h>
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23 #include <string.h>
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24 #include <lw_alloc.h>
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25 #include <lw_string.h>
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26
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27 #include "tree.h"
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28
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29 static char *node_names[] = {
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30 "NONE",
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31 "PROGRAM",
314
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32 "DECL",
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33 "TYPE_CHAR",
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34 "TYPE_SHORT",
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35 "TYPE_INT",
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36 "TYPE_LONG",
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37 "TYPE_LONGLONG",
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38 "IDENT",
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39 "TYPE_PTR",
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40 "TYPE_SCHAR",
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41 "TYPE_UCHAR",
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42 "TYPE_USHORT",
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43 "TYPE_UINT",
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44 "TYPE_ULONG",
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45 "TYPE_ULONGLONG",
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46 "TYPE_VOID",
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47 "TYPE_FLOAT",
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48 "TYPE_DOUBLE",
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49 "TYPE_LDOUBLE",
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50 "FUNDEF",
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51 "FUNDECL",
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52 "FUNARGS",
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53 "BLOCK",
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54 "STMT_RETURN",
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55 "CONST_INT",
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56 "OPER_PLUS",
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57 "OPER_MINUS",
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58 "OPER_TIMES",
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59 "OPER_DIVIDE",
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60 "OPER_MOD",
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61 "OPER_COND",
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62 "OPER_FNCALL",
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63 "OPER_SUBSCRIPT",
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64 "OPER_POSTINC",
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65 "OPER_POSTDEC",
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66 "OPER_PTRMEM",
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67 "OPER_OBJMEM",
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68 "OPER_LSH",
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69 "OPER_RSH",
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70 "OPER_LT",
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71 "OPER_LE",
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72 "OPER_GT",
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73 "OPER_GE",
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74 "OPER_EQ",
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75 "OPER_NE",
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76 "OPER_BWAND",
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77 "OPER_BWXOR",
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78 "OPER_BWOR",
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79 "OPER_BAND",
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80 "OPER_BOR",
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81 "OPER_ASS",
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82 "OPER_ADDASS",
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83 "OPER_SUBASS",
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84 "OPER_MULASS",
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85 "OPER_DIVASS",
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86 "OPER_MODASS",
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87 "OPER_LSHASS",
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88 "OPER_RSHASS",
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89 "OPER_BWANDASS",
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90 "OPER_BWXORASS",
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91 "OPER_BWORASS",
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92 "OPER_COMMA",
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93 "TYPECAST",
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94 };
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95
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96
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97
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98 node_t *node_create(int type, ...)
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99 {
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100 node_t *r;
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101 int nargs = 0;
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102 va_list args;
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103
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104 va_start(args, type);
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105 r = lw_alloc(sizeof(node_t));
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106 memset(r, 0, sizeof(node_t));
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107 r -> type = type;
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108
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109 switch (type)
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110 {
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111 case NODE_OPER_PLUS:
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112 case NODE_OPER_MINUS:
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113 case NODE_OPER_TIMES:
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114 case NODE_OPER_DIVIDE:
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115 case NODE_OPER_MOD:
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116 case NODE_OPER_BWAND:
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117 case NODE_OPER_BWXOR:
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118 case NODE_OPER_BWOR:
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119 case NODE_OPER_BAND:
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120 case NODE_OPER_BOR:
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121 case NODE_OPER_SUBSCRIPT:
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122 case NODE_OPER_PTRMEM:
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123 case NODE_OPER_OBJMEM:
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124 case NODE_OPER_ASS:
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125 case NODE_OPER_ADDASS:
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126 case NODE_OPER_SUBASS:
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127 case NODE_OPER_MULASS:
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128 case NODE_OPER_DIVASS:
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129 case NODE_OPER_MODASS:
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130 case NODE_OPER_LSH:
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131 case NODE_OPER_LSHASS:
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132 case NODE_OPER_RSH:
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133 case NODE_OPER_RSHASS:
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134 case NODE_OPER_BWANDASS:
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135 case NODE_OPER_BWORASS:
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136 case NODE_OPER_BWXORASS:
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137 case NODE_OPER_LT:
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138 case NODE_OPER_LE:
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139 case NODE_OPER_GT:
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140 case NODE_OPER_GE:
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141 case NODE_OPER_EQ:
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142 case NODE_OPER_NE:
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143 case NODE_OPER_COMMA:
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144 nargs = 2;
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145 break;
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146
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147 case NODE_OPER_FNCALL:
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148 nargs = 2;
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149 break;
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150
314
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151 case NODE_DECL:
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152 nargs = 2;
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153 break;
502
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154
506
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155 case NODE_TYPECAST:
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parents: 502
diff changeset
156 nargs = 2;
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parents: 502
diff changeset
157 break;
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parents: 502
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158
502
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parents: 501
diff changeset
159 case NODE_OPER_POSTINC:
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parents: 501
diff changeset
160 case NODE_OPER_POSTDEC:
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parents: 501
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161 nargs = 1;
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parents: 501
diff changeset
162 break;
314
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parents: 312
diff changeset
163
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parents: 312
diff changeset
164 case NODE_TYPE_PTR:
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parents: 312
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165 nargs = 1;
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166 break;
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diff changeset
167
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parents: 312
diff changeset
168 case NODE_IDENT:
498
1bd2d590d734 Rejig parser to eliminate lemon
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parents: 314
diff changeset
169 case NODE_CONST_INT:
314
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diff changeset
170 r -> strval = lw_strdup(va_arg(args, char *));
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diff changeset
171 break;
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172
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diff changeset
173 case NODE_FUNDEF:
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parents: 312
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174 nargs = 4;
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parents: 312
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175 break;
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parents: 312
diff changeset
176
502
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parents: 501
diff changeset
177 case NODE_OPER_COND:
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parents: 501
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178 nargs = 3;
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parents: 501
diff changeset
179 break;
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parents: 501
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180
314
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parents: 312
diff changeset
181 case NODE_FUNDECL:
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182 nargs = 3;
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diff changeset
183 break;
312
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parents:
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184 }
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185
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parents:
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186 while (nargs--)
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187 {
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188 node_addchild(r, va_arg(args, node_t *));
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189 }
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190 va_end(args);
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191 return r;
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parents:
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192 }
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parents:
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193
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parents:
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194 void node_destroy(node_t *node)
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parents:
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195 {
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parents:
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196 node_t *n;
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parents:
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197
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parents:
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198 while (node -> children)
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parents:
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199 {
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parents:
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200 n = node -> children -> next_child;
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parents:
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201 node_destroy(node -> children);
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parents:
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202 node -> children = n;
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parents:
diff changeset
203 }
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parents:
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204 lw_free(node -> strval);
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parents:
diff changeset
205 lw_free(node);
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parents:
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206 }
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parents:
diff changeset
207
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parents:
diff changeset
208 void node_addchild(node_t *node, node_t *nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
209 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
210 node_t *tmp;
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parents:
diff changeset
211
314
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
212 if (!nn)
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
213 return;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
214
312
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parents:
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215 nn -> parent = node;
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parents:
diff changeset
216 nn -> next_child = NULL;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
217 if (node -> children)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
218 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
219 for (tmp = node -> children; tmp -> next_child; tmp = tmp -> next_child)
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parents:
diff changeset
220 /* do nothing */ ;
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parents:
diff changeset
221 tmp -> next_child = nn;
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parents:
diff changeset
222 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
223 else
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
224 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
225 node -> children = nn;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
226 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
227 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
228
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
229 void node_removechild(node_t *node, node_t *nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
230 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
231 node_t **pp;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
232 node_t *np;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
233
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
234 if (!node)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
235 node = nn -> parent;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
236
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
237 pp = &(node -> children);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
238 for (np = node -> children; np; np = np -> next_child)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
239 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
240 if (np -> next_child == nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
241 break;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
242 pp = &((*pp) -> next_child);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
243 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
244 if (!np)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
245 return;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
246
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
247 *pp = nn -> next_child;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
248 nn -> parent = NULL;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
249 nn -> next_child = NULL;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
250 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
251
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
252 void node_removechild_destroy(node_t *node, node_t *nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
253 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
254 node_removechild(node, nn);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
255 node_destroy(nn);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
256 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
257
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
258 static void node_display_aux(node_t *node, FILE *f, int level)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
259 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
260 node_t *nn;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
261 int i;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
262
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
263 for (i = 0; i < level * 4; i++)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
264 fputc(' ', f);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
265 fprintf(f, "(%s ", node_names[node -> type]);
314
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
266 if (node -> strval)
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
267 fprintf(f, "\"%s\" ", node -> strval);
312
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
268 fputc('\n', f);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
269 for (nn = node -> children; nn; nn = nn -> next_child)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
270 node_display_aux(nn, f, level + 1);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
271 for (i = 0; i < level * 4; i++)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
272 fputc(' ', f);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
273 fputc(')', f);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
274 fputc('\n', f);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
275 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
276
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
277 void node_display(node_t *node, FILE *f)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
278 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
279 node_display_aux(node, f, 0);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
280 }