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annotate lwasm/strings.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 724bcc4508bc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 strings.c
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3 Copyright © 2021 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 generalized string parsing including
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21 interpolation.
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22
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23 A general string is enclosed in double quotes. Within the string, the
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24 following is supported:
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25
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26 %(VAR): a string variable defined with SETSTR
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27 %[SYM]: the value of SYM; must be constant on pass 1 or will resolve to ""
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28 \": a literal "
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29 \%: a literal %
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30 \n: a newline
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31 \r: a carriage return
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32 \t: a tab
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33 \f: a form feed
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34 \e: ESC (0x1b)
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35 \\: a backslash
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36 \xXX: an 8 bit value where XX are hex digits
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37
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38 */
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39
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40 #include <ctype.h>
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41 #include <string.h>
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42
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43 #include <lw_alloc.h>
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44 #include <lw_dict.h>
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45 #include <lw_string.h>
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46 #include <lw_strbuf.h>
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47
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48 #include "lwasm.h"
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49 #include "instab.h"
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50
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51 void lwasm_stringvar_unset(asmstate_t *as, char *strname)
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52 {
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53 if (!(as -> stringvars))
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54 return;
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55 lw_dict_unset(as -> stringvars, strname);
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56 }
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57
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58 void lwasm_stringvar_set(asmstate_t *as, char *strname, char *strval)
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59 {
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60 if (!(as -> stringvars))
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61 as -> stringvars = lw_dict_create();
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62 lw_dict_set(as -> stringvars, strname, strval);
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63 }
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64
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65 char *lwasm_stringvar_get(asmstate_t *as, char *strname)
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66 {
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67 if (!(as -> stringvars))
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68 return "";
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69 return lw_dict_get(as -> stringvars, strname);
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70 }
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71
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72 PARSEFUNC(pseudo_parse_setstr)
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73 {
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74 char *t1;
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75 char *strname;
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76 char *strval;
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77
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78 l -> len = 0;
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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
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85 for (t1 = *p; *t1 && *t1 != '='; t1++)
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86 /* do nothing */;
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87 strname = lw_alloc(t1 - *p + 1);
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88 strncpy(strname, *p, t1 - *p);
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89 strname[t1 - *p] = '\0';
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90 *p = t1;
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91 if (**p == '\0')
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92 {
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93 lwasm_stringvar_unset(l -> as, strname);
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94 lw_free(strname);
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95 return;
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96 }
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97 (*p)++;
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98 strval = lwasm_parse_general_string(l, p);
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99 if (!strval)
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100 {
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101 lwasm_stringvar_unset(l -> as, strname);
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102 lw_free(strname);
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103 return;
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104 }
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105 lwasm_stringvar_set(l -> as, strname, strval);
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106 lw_free(strval);
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107 }
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108
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109 char *lwasm_parse_general_string(line_t *l, char **p)
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110 {
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111 struct lw_strbuf *sb;
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112
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113 if (!**p || isspace(**p))
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114 return lw_strdup("");
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115 if (**p != '"')
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116 {
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117 lwasm_register_error(l -> as, l, E_OPERAND_BAD);
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118 return NULL;
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119 }
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120
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121 (*p)++;
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122 sb = lw_strbuf_new();
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123 while (**p && **p != '"')
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124 {
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125 switch (**p)
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126 {
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127 case '\\':
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128 if ((*p)[1])
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129 {
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130 (*p)++;
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131 switch (**p)
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132 {
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133 case 'n':
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134 lw_strbuf_add(sb, 10);
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135 break;
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136
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137 case 'r':
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138 lw_strbuf_add(sb, 13);
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139 break;
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140
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141 case 't':
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142 lw_strbuf_add(sb, 9);
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143 break;
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144
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145 case 'f':
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146 lw_strbuf_add(sb, 12);
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147 break;
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148
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149 case 'e':
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150 lw_strbuf_add(sb, 27);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
151 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
152
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
153 case 'x':
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
154 if ((*p)[1] && (*p)[2])
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
155 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
156 int d1 = (*p)[1];
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
157 int d2 = (*p)[2];
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
158 if (d1 < '0' || (d1 > '9' && d1 < 'A') || (d1 > 'F' && d1 < 'a') || d1 > 'f' ||
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
159 d2 < '0' || (d2 > '9' && d2 < 'A') || (d2 > 'F' && d2 < 'a') || d2 > 'f')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
160 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
161 lw_strbuf_add(sb, 'x');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
162 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
163 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
164 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
165 (*p) += 2;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
166 d1 -= '0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
167 d2 -= '0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
168 if (d1 > 9)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
169 d1 -= 7;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
170 if (d1 > 15)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
171 d1 -= 32;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
172 if (d2 > 9)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
173 d2 -= 7;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
174 if (d2 > 15)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
175 d2 -= 32;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
176 lw_strbuf_add(sb, (d1 << 4) | d2);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
177 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
178 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
179 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
180 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
181 lw_strbuf_add(sb, 'x');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
182 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
183 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
184
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
185 default:
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
186 lw_strbuf_add(sb, **p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
187 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
188 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
189 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
190 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
191
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
192 case '%':
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
193 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
194 if (**p == '(')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
195 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
196 char *t1;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
197 // string var
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
198 for (t1 = *p + 1; *t1 && *t1 != ')' && *t1 != '"'; t1++)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
199 /* do nothing */ ;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
200 if (*t1 != ')')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
201 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
202 lw_strbuf_add(sb, '%');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
203 (*p)--;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
204 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
205 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
206 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
207 char *strname;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
208 strname = lw_alloc(t1 - *p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
209 strncpy(strname, *p + 1, t1 - *p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
210 strname[t1 - *p - 1] = '\0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
211 *p = t1;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
212 t1 = lwasm_stringvar_get(l -> as, strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
213 lw_free(strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
214 for (strname = t1; *strname; strname++)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
215 lw_strbuf_add(sb, *strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
216 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
217 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
218 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
219 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
220 // unknown % sequence; back up and output the %
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
221 (*p)--;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
222 lw_strbuf_add(sb, '%');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
223 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
224 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
225
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
226 default:
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
227 lw_strbuf_add(sb, **p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
228 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
229 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
230 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
231 if (**p == '"')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
232 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
233 return lw_strbuf_end(sb);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
234 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
235