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annotate lwasm/struct.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 8764142b3192
children
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0
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1 /*
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2 struct.c
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3 Copyright © 2010 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 Contains stuff associated with structure processing
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21 */
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22
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23 #include <string.h>
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24
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25 #include <lw_alloc.h>
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26 #include <lw_string.h>
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 PARSEFUNC(pseudo_parse_struct)
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32 {
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33 structtab_t *s;
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34
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35 if (as -> instruct)
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36 {
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37 lwasm_register_error(as, l, E_STRUCT_RECURSE);
0
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38 return;
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39 }
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40
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41 if (l -> sym == NULL)
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42 {
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43 lwasm_register_error(as, l, E_STRUCT_NOSYMBOL);
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44 return;
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45 }
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46
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47 for (s = as -> structs; s; s = s -> next)
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48 {
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49 if (!strcmp(s -> name, l -> sym))
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50 break;
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51 }
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52
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53 if (s)
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54 {
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55 lwasm_register_error(as, l, E_STRUCT_DUPE);
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56 return;
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57 }
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58
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59 as -> instruct = 1;
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60
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61 s = lw_alloc(sizeof(structtab_t));
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62 s -> name = lw_strdup(l -> sym);
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63 s -> next = as -> structs;
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64 s -> fields = NULL;
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65 s -> size = 0;
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66 s -> definedat = l;
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67 as -> structs = s;
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68 as -> cstruct = s;
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69
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70 skip_operand(p);
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71
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72 l -> len = 0;
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73 l -> symset = 1;
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74
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75 // save current assembly address and initialize to 0
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76 as -> savedaddr = l -> addr;
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77 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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78 }
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79
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80 static void instantiate_struct(asmstate_t *as, line_t *l, structtab_t *s, char *pref, lw_expr_t baseaddr)
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81 {
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82 int len;
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83 char *t;
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84 int plen;
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85 int addr = 0;
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86 lw_expr_t te, te2;
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87 structtab_field_t *e;
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88
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89 if (baseaddr == NULL)
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90 baseaddr = l -> addr;
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91
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92 plen = strlen(pref);
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93 for (e = s -> fields; e; e = e -> next)
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94 {
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95 if (e -> name)
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96 {
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97 len = plen + strlen(e -> name) + 1;
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98 t = lw_alloc(len + 1);
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99 sprintf(t, "%s.%s", pref, e -> name);
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100 }
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101 else
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102 {
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103 len = plen + 30;
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104 t = lw_alloc(len + 1);
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105 sprintf(t, "%s.____%d", pref, addr);
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106 }
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107
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108 te = lw_expr_build(lw_expr_type_int, addr);
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109 te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, te, baseaddr);
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110 register_symbol(as, l, t, te2, symbol_flag_nocheck);
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111 lw_expr_destroy(te);
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112
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113 if (e -> substruct)
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114 {
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115 instantiate_struct(as, l, e -> substruct, t, te2);
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116 }
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117
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118 lw_expr_destroy(te2);
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119
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120 lw_free(t);
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121 addr += e -> size;
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122 }
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123
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124 /* register the "sizeof" symbol */
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125 len = plen + 8;
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126 t = lw_alloc(len + 1);
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127 sprintf(t, "sizeof{%s}", pref);
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128 te = lw_expr_build(lw_expr_type_int, s -> size);
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129 register_symbol(as, l, t, te, symbol_flag_nocheck);
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130 lw_expr_destroy(te);
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131 lw_free(t);
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132 }
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133
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134
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135 PARSEFUNC(pseudo_parse_endstruct)
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136 {
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137 lw_expr_t te;
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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138
0
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139 if (as -> instruct == 0)
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140 {
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141 lwasm_register_error(as, l, W_ENDSTRUCT_WITHOUT);
0
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142 skip_operand(p);
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143 return;
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144 }
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145
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146 te = lw_expr_build(lw_expr_type_int, 0);
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147
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148 // make all the relevant generic struct symbols
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149 instantiate_struct(as, l, as -> cstruct, as -> cstruct -> name, te);
0
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150 lw_expr_destroy(te);
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151
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152 l -> soff = as -> cstruct -> size;
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153 as -> instruct = 0;
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154
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155 skip_operand(p);
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156
61
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157 lw_expr_destroy(l -> addr);
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158 l -> addr = as -> savedaddr;
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159 as -> savedaddr = NULL;
0
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160
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161 l -> len = 0;
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162 }
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163
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164 void register_struct_entry(asmstate_t *as, line_t *l, int size, structtab_t *ss)
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165 {
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166 structtab_field_t *e, *e2;
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167
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168 l -> soff = as -> cstruct -> size;
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169 e = lw_alloc(sizeof(structtab_field_t));
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170 e -> next = NULL;
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171 e -> size = size;
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172 if (l -> sym)
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173 e -> name = lw_strdup(l -> sym);
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174 else
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175 e -> name = NULL;
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176 e -> substruct = ss;
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177 if (as -> cstruct -> fields)
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178 {
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179 for (e2 = as -> cstruct -> fields; e2 -> next; e2 = e2 -> next)
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180 /* do nothing */ ;
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181 e2 -> next = e;
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182 }
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183 else
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184 {
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185 as -> cstruct -> fields = e;
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186 }
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187 as -> cstruct -> size += size;
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188 }
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189
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190 int expand_struct(asmstate_t *as, line_t *l, char **p, char *opc)
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191 {
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192 structtab_t *s;
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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193
0
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194 debug_message(as, 200, "Checking for structure expansion: %s", opc);
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195
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196 for (s = as -> structs; s; s = s -> next)
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197 {
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198 if (!strcmp(opc, s -> name))
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199 break;
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200 }
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201
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202 if (!s)
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203 return -1;
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204
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205 debug_message(as, 10, "Expanding structure: %s", opc);
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206
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207 if (!(l -> sym))
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208 {
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209 lwasm_register_error(as, l, E_STRUCT_NONAME);
2
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210 return -1;
0
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211 }
47
1d6a31a2586b Fixed multiple symbol error with nested structs
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212
0
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213 l -> len = s -> size;
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214
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215 if (as -> instruct)
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216 {
61
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217 /* register substruct here */
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218 register_struct_entry(as, l, s -> size, s);
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219 /* mark the symbol consumed */
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220 l -> symset = 1;
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221 l -> len = 0;
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222 return 0;
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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223 }
0
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224 else
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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225 {
61
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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226 /* instantiate the struct here */
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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227 instantiate_struct(as, l, s, l -> sym, NULL);
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228 return 0;
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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229 }
0
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230
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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231 return 0;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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232 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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233