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annotate lwcc/tree.c @ 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 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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parents: 502
diff changeset
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
diff changeset
158
502
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William Astle <lost@l-w.ca>
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
diff changeset
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
diff changeset
165 nargs = 1;
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parents: 312
diff changeset
166 break;
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parents: 312
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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parents: 312
diff changeset
170 r -> strval = lw_strdup(va_arg(args, char *));
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parents: 312
diff changeset
171 break;
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parents: 312
diff changeset
172
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parents: 312
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
diff changeset
175 break;
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William Astle <lost@l-w.ca>
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
diff changeset
178 nargs = 3;
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parents: 501
diff changeset
179 break;
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parents: 501
diff changeset
180
314
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parents: 312
diff changeset
181 case NODE_FUNDECL:
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parents: 312
diff changeset
182 nargs = 3;
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parents: 312
diff changeset
183 break;
312
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parents:
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184 }
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parents:
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185
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parents:
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186 while (nargs--)
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parents:
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187 {
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parents:
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188 node_addchild(r, va_arg(args, node_t *));
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parents:
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189 }
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parents:
diff changeset
190 va_end(args);
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parents:
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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:
diff changeset
194 void node_destroy(node_t *node)
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parents:
diff changeset
195 {
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parents:
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196 node_t *n;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
197
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parents:
diff changeset
198 while (node -> children)
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parents:
diff changeset
199 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
200 n = node -> children -> next_child;
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William Astle <lost@l-w.ca>
parents:
diff changeset
201 node_destroy(node -> children);
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William Astle <lost@l-w.ca>
parents:
diff changeset
202 node -> children = n;
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parents:
diff changeset
203 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
204 lw_free(node -> strval);
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William Astle <lost@l-w.ca>
parents:
diff changeset
205 lw_free(node);
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
206 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
207
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
208 void node_addchild(node_t *node, node_t *nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
209 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
210 node_t *tmp;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
211
314
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
212 if (!nn)
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
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:
diff changeset
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
William Astle <lost@l-w.ca>
parents:
diff changeset
217 if (node -> children)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
218 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
219 for (tmp = node -> children; tmp -> next_child; tmp = tmp -> next_child)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
220 /* do nothing */ ;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
221 tmp -> next_child = nn;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
222 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
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
William Astle <lost@l-w.ca>
parents:
diff changeset
225 node -> children = nn;
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
226 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
227 }
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
228
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
229 void node_removechild(node_t *node, node_t *nn)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
230 {
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
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
William Astle <lost@l-w.ca>
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
William Astle <lost@l-w.ca>
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 }