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Updated submission guidelines including notes about evangelism. TLDR: Don't.
author William Astle <lost@l-w.ca>
date Mon, 04 Mar 2024 10:10:38 -0700
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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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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152 }
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153 break;
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154 }
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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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185 { PTOK_KW_SIGNED, TOK_KW_SIGNED },
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186 { PTOK_KW_UNSIGNED, TOK_KW_UNSIGNED },
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187 { PTOK_STAR, TOK_STAR },
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188 { PTOK_KW_VOID, TOK_KW_VOID },
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189 { PTOK_KW_FLOAT, TOK_KW_FLOAT },
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190 { PTOK_KW_DOUBLE, TOK_KW_DOUBLE },
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191 { PTOK_OBRACE, TOK_OBRACE },
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192 { PTOK_CBRACE, TOK_CBRACE },
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193 { PTOK_OPAREN, TOK_OPAREN },
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194 { PTOK_CPAREN, TOK_CPAREN },
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195 { 0, 0 }
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196 };
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197
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198 static int lookup_ptok(int ttype)
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199 {
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200 int i;
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201 for (i = 0; toktable[i].tokid != 0; i++)
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202 if (toktable[i].ttype == ttype)
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203 return toktable[i].tokid;
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204 return -1;
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205 }
312
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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206
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207 node_t *parse_program(struct preproc_info *pp)
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208 {
314
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209 struct token *tok;
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210 struct tokendata *td;
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211 struct parserinfo pi = { NULL };
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212 void *parser;
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213
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214 /* the cast below shuts up a warning */
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215 parser = ParseAlloc((void *)lw_alloc);
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216 for (;;)
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217 {
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218 tok = parse_next(pp);
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219 if (tok -> ttype == TOK_EOF)
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220 break;
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221
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222 td = lw_alloc(sizeof(struct tokendata));
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223 td -> strval = NULL;
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224 td -> numval[0] = 0;
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225 td -> numval[1] = 0;
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226 td -> numval[2] = 0;
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227 td -> numval[3] = 0;
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228 td -> numval[4] = 0;
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229 td -> numval[5] = 0;
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230 td -> numval[6] = 0;
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diff changeset
231 td -> numval[7] = 0;
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232 td -> tokid = lookup_ptok(tok -> ttype);
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233 if (tok -> strval)
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234 td -> strval = lw_strdup(tok -> strval);
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235
a3e277c58df9 Checkpoint parser development for lwcc
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236 tokendata_print(stderr, td);
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diff changeset
237
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
238 Parse(parser, td -> tokid, td, &pi);
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diff changeset
239 }
a3e277c58df9 Checkpoint parser development for lwcc
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parents: 312
diff changeset
240 Parse(parser, 0, NULL, &pi);
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
241 ParseFree(parser, lw_free);
a3e277c58df9 Checkpoint parser development for lwcc
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diff changeset
242 return pi.parsetree;
312
41118fb0a8f2 Add no-op parser and parse tree infrastructure
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parents:
diff changeset
243 }