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annotate lwcc/parse.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 a3e277c58df9
children
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1 /*
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2 lwcc/parse.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 <stdio.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
312
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27 #include "cpp.h"
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28 #include "tree.h"
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29 #include "parse.h"
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30
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31 #include "parse_c.h"
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32
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33
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34 void *Parse(void *parser, int tokid, struct tokendata *tdata, struct parserinfo *pi);
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35 void *ParseAlloc(void *(*alloc)(size_t size));
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36 void ParseFree(void *parser, void (*free)(void *ptr));
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37
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38 void tokendata_free(struct tokendata *td)
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39 {
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40 if (td)
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41 {
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42 if (td -> strval)
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43 lw_free(td -> strval);
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44 lw_free(td);
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45 }
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46 }
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47
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48 extern char *ptoken_names[];
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49 char *tokendata_name(struct tokendata *td)
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50 {
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51 if (td -> tokid < 0)
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52 return "****UNKNOWN****";
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53 return ptoken_names[td -> tokid];
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54 }
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55
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56 void tokendata_print(FILE *fp, struct tokendata *td)
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57 {
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58 fprintf(fp, "TOKEN: %s", tokendata_name(td));
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59 if (td -> strval)
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60 fprintf(fp, " \"%s\"", td -> strval);
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61 fprintf(fp, "\n");
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62 }
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63
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64 #define TOK_KW_IF -1
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65 #define TOK_KW_ELSE -2
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66 #define TOK_KW_WHILE -3
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67 #define TOK_KW_DO -4
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68 #define TOK_KW_FOR -5
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69 #define TOK_KW_VOID -6
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70 #define TOK_KW_INT -7
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71 #define TOK_KW_CHAR -8
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72 #define TOK_KW_SHORT -9
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73 #define TOK_KW_LONG -10
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74 #define TOK_KW_UNSIGNED -11
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75 #define TOK_KW_SIGNED -12
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76 #define TOK_KW_FLOAT -13
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77 #define TOK_KW_DOUBLE -14
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78 #define TOK_KW_STRUCT -15
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79 #define TOK_KW_UNION -16
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80 #define TOK_KW_TYPEDEF -17
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81 #define TOK_KW_STATIC -18
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82 #define TOK_KW_SWITCH -19
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83 #define TOK_KW_CASE -20
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84 #define TOK_KW_DEFAULT -21
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85 #define TOK_KW_BREAK -22
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86 #define TOK_KW_CONTINUE -23
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87 #define TOK_KW_CONST -24
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88 #define TOK_KW_AUTO -25
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89 #define TOK_KW_ENUM -26
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90 #define TOK_KW_REGISTER -27
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91 #define TOK_KW_SIZEOF -28
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92 #define TOK_KW_VOLATILE -29
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93 #define TOK_KW_RETURN -30
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94 #define TOK_KW_EXTERN -31
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95 #define TOK_KW_GOTO -32
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96 #define TOK_TYPENAME -100
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97
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98 static struct { int tok; char *word; } keyword_list[] = {
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99 { TOK_KW_IF, "if" },
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100 { TOK_KW_ELSE, "else" },
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101 { TOK_KW_WHILE, "while" },
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102 { TOK_KW_DO, "do" },
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103 { TOK_KW_FOR, "for" },
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104 { TOK_KW_VOID, "void" },
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105 { TOK_KW_INT, "int" },
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106 { TOK_KW_CHAR, "char" },
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107 { TOK_KW_SHORT, "short" },
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108 { TOK_KW_LONG, "long" },
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109 { TOK_KW_UNSIGNED, "unsigned" },
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110 { TOK_KW_SIGNED, "signed" },
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111 { TOK_KW_FLOAT, "float" },
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112 { TOK_KW_DOUBLE, "double" },
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113 { TOK_KW_STRUCT, "struct" },
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114 { TOK_KW_UNION, "union" },
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115 { TOK_KW_TYPEDEF, "typedef" },
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116 { TOK_KW_STATIC, "static" },
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117 { TOK_KW_SWITCH, "switch" },
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118 { TOK_KW_CASE, "case" },
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119 { TOK_KW_DEFAULT, "default" },
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120 { TOK_KW_BREAK, "break" },
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121 { TOK_KW_CONTINUE, "continue" },
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122 { TOK_KW_CONST, "const" },
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123 { TOK_KW_AUTO, "auto" },
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124 { TOK_KW_ENUM, "enum" },
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125 { TOK_KW_REGISTER, "register" },
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126 { TOK_KW_SIZEOF, "sizeof" },
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127 { TOK_KW_VOLATILE, "volatile" },
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128 { TOK_KW_RETURN, "return" },
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129 { TOK_KW_EXTERN, "extern" },
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130 { TOK_KW_GOTO, "goto" },
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131 { 0, "" }
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132 };
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133
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134 struct token *parse_next(struct preproc_info *pp)
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135 {
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136 struct token *tok;
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137 int i;
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138
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139 for (;;)
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140 {
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141 tok = preproc_next(pp);
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142 if (tok -> ttype == TOK_WSPACE)
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143 continue;
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144 if (tok -> ttype == TOK_EOL)
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145 continue;
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diff changeset
146 if (tok -> ttype == TOK_CHAR)
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147 {
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148 // random character
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149 fprintf(stderr, "Random character %02x\n", tok -> strval[0]);
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150 if (tok -> strval[0] < 32 || tok -> strval[0] > 126)
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diff changeset
151 continue;
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diff changeset
152 }
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153 break;
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154 }
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parents: 312
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155 if (tok -> ttype == TOK_IDENT)
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156 {
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157 /* convert identifier tokens to their respective meanings */
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158 for (i = 0; keyword_list[i].tok != TOK_NONE; i++)
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159 {
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160 if (strcmp(keyword_list[i].word, tok -> strval) == 0)
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161 {
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162 tok -> ttype = keyword_list[i].tok;
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163 goto out;
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164 }
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165 }
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166 /* check for a registered type here */
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167 }
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168 out:
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169 fprintf(stderr, "Lexed: ");
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170 token_print(tok, stderr);
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171 fprintf(stderr, " (%d)\n", tok -> ttype);
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172 return tok;
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173 }
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174
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175 static struct {
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176 int tokid;
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177 int ttype;
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178 } toktable[] = {
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179 { PTOK_IDENTIFIER, TOK_IDENT },
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180 { PTOK_ENDS, TOK_EOS },
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181 { PTOK_KW_INT, TOK_KW_INT },
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182 { PTOK_KW_LONG, TOK_KW_LONG },
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183 { PTOK_KW_SHORT, TOK_KW_SHORT },
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184 { PTOK_KW_CHAR, TOK_KW_CHAR },
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diff changeset
185 { PTOK_KW_SIGNED, TOK_KW_SIGNED },
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diff changeset
186 { PTOK_KW_UNSIGNED, TOK_KW_UNSIGNED },
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diff changeset
187 { PTOK_STAR, TOK_STAR },
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diff changeset
188 { PTOK_KW_VOID, TOK_KW_VOID },
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diff changeset
189 { PTOK_KW_FLOAT, TOK_KW_FLOAT },
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diff changeset
190 { PTOK_KW_DOUBLE, TOK_KW_DOUBLE },
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diff changeset
191 { PTOK_OBRACE, TOK_OBRACE },
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192 { PTOK_CBRACE, TOK_CBRACE },
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diff changeset
193 { PTOK_OPAREN, TOK_OPAREN },
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
194 { PTOK_CPAREN, TOK_CPAREN },
a3e277c58df9 Checkpoint parser development for lwcc
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195 { 0, 0 }
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
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diff changeset
196 };
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parents: 312
diff changeset
197
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diff changeset
198 static int lookup_ptok(int ttype)
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diff changeset
199 {
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
200 int i;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
201 for (i = 0; toktable[i].tokid != 0; i++)
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William Astle <lost@l-w.ca>
parents: 312
diff changeset
202 if (toktable[i].ttype == ttype)
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
203 return toktable[i].tokid;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
204 return -1;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
205 }
312
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
206
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William Astle <lost@l-w.ca>
parents:
diff changeset
207 node_t *parse_program(struct preproc_info *pp)
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
208 {
314
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
209 struct token *tok;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
210 struct tokendata *td;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
211 struct parserinfo pi = { NULL };
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
212 void *parser;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
213
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parents: 312
diff changeset
214 /* the cast below shuts up a warning */
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
215 parser = ParseAlloc((void *)lw_alloc);
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parents: 312
diff changeset
216 for (;;)
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
217 {
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
218 tok = parse_next(pp);
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
219 if (tok -> ttype == TOK_EOF)
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
220 break;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
221
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
222 td = lw_alloc(sizeof(struct tokendata));
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
223 td -> strval = NULL;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
224 td -> numval[0] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
225 td -> numval[1] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
226 td -> numval[2] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
227 td -> numval[3] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
228 td -> numval[4] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
229 td -> numval[5] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
230 td -> numval[6] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
231 td -> numval[7] = 0;
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
232 td -> tokid = lookup_ptok(tok -> ttype);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
233 if (tok -> strval)
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
234 td -> strval = lw_strdup(tok -> strval);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
235
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
236 tokendata_print(stderr, td);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
237
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
238 Parse(parser, td -> tokid, td, &pi);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
239 }
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
240 Parse(parser, 0, NULL, &pi);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
241 ParseFree(parser, lw_free);
a3e277c58df9 Checkpoint parser development for lwcc
William Astle <lost@l-w.ca>
parents: 312
diff changeset
242 return pi.parsetree;
312
41118fb0a8f2 Add no-op parser and parse tree infrastructure
William Astle <lost@l-w.ca>
parents:
diff changeset
243 }