annotate eval.c @ 108:0921c47b4f22

C99INLINE, not __c99inline
author David A. Holland
date Tue, 11 Jun 2013 12:17:27 -0400
parents 33954a07d013
children 1d2bad7151f9
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1 /*-
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2 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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3 * All rights reserved.
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4 *
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5 * This code is derived from software contributed to The NetBSD Foundation
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6 * by David A. Holland.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 * 1. Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in the
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15 * documentation and/or other materials provided with the distribution.
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16 *
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17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 * POSSIBILITY OF SUCH DAMAGE.
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28 */
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29
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <limits.h>
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33 #include <errno.h>
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34
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35 //#define DEBUG
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36 #ifdef DEBUG
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37 #include <stdio.h>
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38 #endif
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39
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40 #include "utils.h"
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41 #include "array.h"
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42 #include "mode.h"
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43 #include "place.h"
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44 #include "eval.h"
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45
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46 /*
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47 * e ::=
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48 * e1 ? e2 : e3
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49 * e1 || e2
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50 * e1 && e2
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51 * e1 | e2
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52 * e1 ^ e2
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53 * e1 & e2
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54 * e1 == e2 | e1 != e2
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55 * e1 < e2 | e1 <= e2 | e1 > e2 | e1 >= e2
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56 * e1 << e2 | e1 >> e2
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57 * e1 + e2 | e1 - e2
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58 * e1 * e2 | e1 / e2 | e1 % e2
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59 * !e | ~e | -e | +e
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60 * ( e ) | ident
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61 */
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62
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63 enum tokens {
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64 T_EOF, /* end of input */
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65 T_VAL, /* value */
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66 T_LPAREN, /* parens */
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67 T_RPAREN,
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68 T_PIPEPIPE, /* operators */
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69 T_AMPAMP,
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70 T_EQEQ,
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71 T_BANGEQ,
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72 T_LTEQ,
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73 T_GTEQ,
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74 T_LTLT,
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75 T_GTGT,
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76 T_QUES,
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77 T_COLON,
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78 T_PIPE,
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79 T_CARET,
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80 T_AMP,
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81 T_LT,
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82 T_GT,
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83 T_PLUS,
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84 T_MINUS,
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85 T_STAR,
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86 T_SLASH,
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87 T_PCT,
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88 T_BANG,
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89 T_TILDE,
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90 };
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91
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92 static const struct {
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93 char c1, c2;
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94 enum tokens tok;
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95 } tokens_2[] = {
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96 { '|', '|', T_PIPEPIPE },
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97 { '&', '&', T_AMPAMP },
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98 { '=', '=', T_EQEQ },
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99 { '!', '=', T_BANGEQ },
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100 { '<', '=', T_LTEQ },
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101 { '>', '=', T_GTEQ },
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102 { '<', '<', T_LTLT },
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103 { '>', '>', T_GTGT },
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104 };
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105 static const unsigned num_tokens_2 = HOWMANY(tokens_2);
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106
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107 static const struct {
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108 char c1;
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109 enum tokens tok;
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110 } tokens_1[] = {
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111 { '?', T_QUES },
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112 { ':', T_COLON },
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113 { '|', T_PIPE },
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114 { '^', T_CARET },
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115 { '&', T_AMP },
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116 { '<', T_LT },
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117 { '>', T_GT },
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118 { '+', T_PLUS },
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119 { '-', T_MINUS },
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120 { '*', T_STAR },
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121 { '/', T_SLASH },
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122 { '%', T_PCT },
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123 { '!', T_BANG },
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124 { '~', T_TILDE },
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125 { '(', T_LPAREN },
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126 { ')', T_RPAREN },
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127 };
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128 static const unsigned num_tokens_1 = HOWMANY(tokens_1);
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129
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130 struct token {
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131 struct place place;
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132 enum tokens tok;
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133 int val;
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134 };
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135 DECLARRAY(token, static UNUSED);
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136 DEFARRAY(token, static);
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137
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138 static struct tokenarray tokens;
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139
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140 static
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141 struct token *
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142 token_create(const struct place *p, enum tokens tok, int val)
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143 {
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144 struct token *t;
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145
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146 t = domalloc(sizeof(*t));
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147 t->place = *p;
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148 t->tok = tok;
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149 t->val = val;
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150 return t;
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151 }
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152
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153 static
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154 void
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155 token_destroy(struct token *t)
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156 {
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157 dofree(t, sizeof(*t));
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158 }
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159
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160 DESTROYALL_ARRAY(token, );
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161
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162 #ifdef DEBUG
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163 static
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164 void
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165 printtokens(void)
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166 {
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167 unsigned i, num;
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168 struct token *t;
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169
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170 fprintf(stderr, "tokens:");
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171 num = tokenarray_num(&tokens);
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172 for (i=0; i<num; i++) {
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173 t = tokenarray_get(&tokens, i);
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174 switch (t->tok) {
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175 case T_EOF: fprintf(stderr, " <eof>"); break;
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176 case T_VAL: fprintf(stderr, " %d", t->val); break;
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177 case T_LPAREN: fprintf(stderr, " ("); break;
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178 case T_RPAREN: fprintf(stderr, " )"); break;
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179 case T_PIPEPIPE: fprintf(stderr, " ||"); break;
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180 case T_AMPAMP: fprintf(stderr, " &&"); break;
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181 case T_EQEQ: fprintf(stderr, " =="); break;
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182 case T_BANGEQ: fprintf(stderr, " !="); break;
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183 case T_LTEQ: fprintf(stderr, " <="); break;
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184 case T_GTEQ: fprintf(stderr, " >="); break;
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185 case T_LTLT: fprintf(stderr, " <<"); break;
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186 case T_GTGT: fprintf(stderr, " >>"); break;
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187 case T_QUES: fprintf(stderr, " ?"); break;
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188 case T_COLON: fprintf(stderr, " :"); break;
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189 case T_PIPE: fprintf(stderr, " |"); break;
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190 case T_CARET: fprintf(stderr, " ^"); break;
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191 case T_AMP: fprintf(stderr, " &"); break;
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192 case T_LT: fprintf(stderr, " <"); break;
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193 case T_GT: fprintf(stderr, " >"); break;
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194 case T_PLUS: fprintf(stderr, " +"); break;
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195 case T_MINUS: fprintf(stderr, " -"); break;
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196 case T_STAR: fprintf(stderr, " *"); break;
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197 case T_SLASH: fprintf(stderr, " /"); break;
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198 case T_PCT: fprintf(stderr, " %%"); break;
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199 case T_BANG: fprintf(stderr, " !"); break;
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200 case T_TILDE: fprintf(stderr, " ~"); break;
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201 }
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202 }
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203 fprintf(stderr, "\n");
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204 }
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205 #endif
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206
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207 static
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208 bool
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209 isuop(enum tokens tok)
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210 {
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211 switch (tok) {
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212 case T_BANG:
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213 case T_TILDE:
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214 case T_MINUS:
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215 case T_PLUS:
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216 return true;
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217 default:
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218 break;
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219 }
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220 return false;
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221 }
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222
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223 static
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224 bool
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225 isbop(enum tokens tok)
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226 {
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227 switch (tok) {
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228 case T_EOF:
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229 case T_VAL:
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230 case T_LPAREN:
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231 case T_RPAREN:
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232 case T_COLON:
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233 case T_QUES:
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234 case T_BANG:
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235 case T_TILDE:
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236 return false;
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237 default:
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238 break;
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239 }
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240 return true;
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241 }
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242
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243 static
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244 bool
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245 isop(enum tokens tok)
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246 {
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247 switch (tok) {
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248 case T_EOF:
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249 case T_VAL:
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250 case T_LPAREN:
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251 case T_RPAREN:
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252 return false;
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253 default:
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254 break;
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255 }
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256 return true;
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257 }
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258
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259 static
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260 int
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261 getprec(enum tokens tok)
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262 {
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263 switch (tok) {
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264 case T_BANG: case T_TILDE: return -1;
16
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265 case T_STAR: case T_SLASH: case T_PCT: return 0;
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266 case T_PLUS: case T_MINUS: return 1;
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267 case T_LTLT: case T_GTGT: return 2;
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268 case T_LT: case T_LTEQ: case T_GT: case T_GTEQ: return 3;
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269 case T_EQEQ: case T_BANGEQ: return 4;
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270 case T_AMP: return 5;
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271 case T_CARET: return 6;
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272 case T_PIPE: return 7;
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273 case T_AMPAMP: return 8;
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274 case T_PIPEPIPE: return 9;
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275 default: break;
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276 }
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277 return 10;
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278 }
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279
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280 static
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281 bool
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282 looser(enum tokens t1, enum tokens t2)
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283 {
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284 return getprec(t1) >= getprec(t2);
16
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285 }
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286
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287 static
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288 int
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289 eval_uop(enum tokens op, int val)
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290 {
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291 switch (op) {
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292 case T_BANG: val = !val; break;
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293 case T_TILDE: val = (int)~(unsigned)val; break;
9dda765ee85c expression evaluator
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294 case T_MINUS: val = -val; break;
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295 case T_PLUS: break;
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296 default: assert(0); break;
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297 }
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298 return val;
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299 }
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300
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301 static
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302 int
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303 eval_bop(struct place *p, int lv, enum tokens op, int rv)
16
9dda765ee85c expression evaluator
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304 {
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305 unsigned mask;
9dda765ee85c expression evaluator
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306
9dda765ee85c expression evaluator
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307 switch (op) {
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308 case T_PIPEPIPE: return lv || rv;
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309 case T_AMPAMP: return lv && rv;
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310 case T_PIPE: return (int)((unsigned)lv | (unsigned)rv);
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311 case T_CARET: return (int)((unsigned)lv ^ (unsigned)rv);
9dda765ee85c expression evaluator
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312 case T_AMP: return (int)((unsigned)lv & (unsigned)rv);
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313 case T_EQEQ: return lv == rv;
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314 case T_BANGEQ: return lv != rv;
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315 case T_LT: return lv < rv;
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316 case T_GT: return lv > rv;
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317 case T_LTEQ: return lv <= rv;
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318 case T_GTEQ: return lv >= rv;
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319
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320 case T_LTLT:
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321 case T_GTGT:
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322 if (rv < 0) {
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323 complain(p, "Negative bit-shift");
9dda765ee85c expression evaluator
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324 complain_fail();
9dda765ee85c expression evaluator
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325 rv = 0;
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326 }
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327 if ((unsigned)rv >= CHAR_BIT * sizeof(unsigned)) {
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328 complain(p, "Bit-shift farther than type width");
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329 complain_fail();
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330 rv = 0;
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331 }
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332 if (op == T_LTLT) {
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333 return (int)((unsigned)lv << (unsigned)rv);
9dda765ee85c expression evaluator
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334 }
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335 mask = ((unsigned)-1) << (CHAR_BIT * sizeof(unsigned) - rv);
9dda765ee85c expression evaluator
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336 lv = (int)(((unsigned)lv >> (unsigned)rv) | mask);
9dda765ee85c expression evaluator
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337 return lv;
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338
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339 case T_MINUS:
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340 if (rv == INT_MIN) {
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341 if (lv == INT_MIN) {
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342 return 0;
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343 }
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344 lv--;
9dda765ee85c expression evaluator
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345 rv++;
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346 }
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347 rv = -rv;
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348 /* FALLTHROUGH */
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349 case T_PLUS:
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350 if (rv > 0 && lv > (INT_MAX - rv)) {
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351 complain(p, "Integer overflow");
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352 complain_fail();
9dda765ee85c expression evaluator
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353 return INT_MAX;
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354 }
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355 if (rv < 0 && lv < (INT_MIN - rv)) {
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356 complain(p, "Integer underflow");
9dda765ee85c expression evaluator
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357 complain_fail();
9dda765ee85c expression evaluator
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358 return INT_MIN;
9dda765ee85c expression evaluator
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359 }
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360 return lv + rv;
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361
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362 case T_STAR:
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363 if (rv == 0) {
9dda765ee85c expression evaluator
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364 return 0;
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365 }
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366 if (rv == 1) {
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367 return lv;
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368 }
9dda765ee85c expression evaluator
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369 if (rv == -1 && lv == INT_MIN) {
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370 lv++;
9dda765ee85c expression evaluator
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371 lv = -lv;
9dda765ee85c expression evaluator
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372 if (lv == INT_MAX) {
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373 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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374 complain_fail();
9dda765ee85c expression evaluator
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375 return INT_MAX;
9dda765ee85c expression evaluator
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376 }
9dda765ee85c expression evaluator
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377 lv++;
9dda765ee85c expression evaluator
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378 return lv;
9dda765ee85c expression evaluator
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379 }
9dda765ee85c expression evaluator
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380 if (lv == INT_MIN && rv < 0) {
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381 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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382 complain_fail();
9dda765ee85c expression evaluator
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383 return INT_MAX;
9dda765ee85c expression evaluator
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384 }
9dda765ee85c expression evaluator
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385 if (lv == INT_MIN && rv > 0) {
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386 complain(p, "Integer underflow");
9dda765ee85c expression evaluator
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387 complain_fail();
9dda765ee85c expression evaluator
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388 return INT_MIN;
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389 }
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390 if (rv < 0) {
9dda765ee85c expression evaluator
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391 rv = -rv;
9dda765ee85c expression evaluator
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392 lv = -lv;
9dda765ee85c expression evaluator
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393 }
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
394 if (lv > 0 && lv > INT_MAX / rv) {
9dda765ee85c expression evaluator
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395 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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396 complain_fail();
9dda765ee85c expression evaluator
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397 return INT_MAX;
9dda765ee85c expression evaluator
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398 }
9dda765ee85c expression evaluator
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diff changeset
399 if (lv < 0 && lv < INT_MIN / rv) {
9dda765ee85c expression evaluator
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400 complain(p, "Integer underflow");
9dda765ee85c expression evaluator
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401 complain_fail();
9dda765ee85c expression evaluator
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402 return INT_MIN;
9dda765ee85c expression evaluator
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403 }
9dda765ee85c expression evaluator
David A. Holland
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404 return lv * rv;
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
405
9dda765ee85c expression evaluator
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diff changeset
406 case T_SLASH:
9dda765ee85c expression evaluator
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diff changeset
407 if (rv == 0) {
9dda765ee85c expression evaluator
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408 complain(p, "Division by zero");
9dda765ee85c expression evaluator
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409 complain_fail();
9dda765ee85c expression evaluator
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410 return 0;
9dda765ee85c expression evaluator
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diff changeset
411 }
9dda765ee85c expression evaluator
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diff changeset
412 return lv / rv;
9dda765ee85c expression evaluator
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diff changeset
413
9dda765ee85c expression evaluator
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diff changeset
414 case T_PCT:
9dda765ee85c expression evaluator
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diff changeset
415 if (rv == 0) {
9dda765ee85c expression evaluator
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416 complain(p, "Modulus by zero");
9dda765ee85c expression evaluator
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417 complain_fail();
9dda765ee85c expression evaluator
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418 return 0;
9dda765ee85c expression evaluator
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419 }
9dda765ee85c expression evaluator
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diff changeset
420 return lv % rv;
9dda765ee85c expression evaluator
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diff changeset
421
9dda765ee85c expression evaluator
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422 default: assert(0); break;
9dda765ee85c expression evaluator
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423 }
9dda765ee85c expression evaluator
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424 return 0;
9dda765ee85c expression evaluator
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parents:
diff changeset
425 }
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
426
9dda765ee85c expression evaluator
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427 static
9dda765ee85c expression evaluator
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428 void
9dda765ee85c expression evaluator
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429 tryreduce(void)
9dda765ee85c expression evaluator
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diff changeset
430 {
9dda765ee85c expression evaluator
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431 unsigned num;
9dda765ee85c expression evaluator
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432 struct token *t1, *t2, *t3, *t4, *t5, *t6;
9dda765ee85c expression evaluator
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433
9dda765ee85c expression evaluator
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diff changeset
434 while (1) {
92
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diff changeset
435 #ifdef DEBUG
b127a69061b2 fix some bugs.
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436 printtokens();
b127a69061b2 fix some bugs.
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437 #endif
16
9dda765ee85c expression evaluator
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parents:
diff changeset
438 num = tokenarray_num(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
439 t1 = (num >= 1) ? tokenarray_get(&tokens, num-1) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
440 t2 = (num >= 2) ? tokenarray_get(&tokens, num-2) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
441 t3 = (num >= 3) ? tokenarray_get(&tokens, num-3) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
442
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
443 if (num >= 3 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
444 t3->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
445 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
446 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
447 /* (x) -> x */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
448 t2->place = t3->place;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
449 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
450 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
451 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
452 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
453 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
454 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
455
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
456 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
457 (num == 2 || isop(t3->tok) || t3->tok == T_LPAREN) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
458 isuop(t2->tok) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
459 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
460 /* unary operator */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
461 t1->val = eval_uop(t2->tok, t1->val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
462 t1->place = t2->place;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
463 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
464 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
465 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
466 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
467 if (num >= 2 &&
92
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
468 (num == 2 || isop(t3->tok) || t3->tok == T_LPAREN) &&
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
469 t2->tok != T_LPAREN && t2->tok != T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
470 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
471 complain(&t2->place, "Invalid unary operator");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
472 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
473 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
474 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
475 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
476 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
477
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
478
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
479 t4 = (num >= 4) ? tokenarray_get(&tokens, num-4) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
480
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
481 if (num >= 4 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
482 t4->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
483 isbop(t3->tok) &&
92
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
484 t2->tok == T_VAL) {
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
485 /* binary operator */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
486 if (looser(t1->tok, t3->tok)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
487 t4->val = eval_bop(&t3->place,
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
488 t4->val, t3->tok, t2->val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
489 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
490 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
491 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
492 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
493 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
494 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
495 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
496 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
497
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
498 t5 = (num >= 5) ? tokenarray_get(&tokens, num-5) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
499 t6 = (num >= 6) ? tokenarray_get(&tokens, num-6) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
500
91
bd1b7a09da89 Don't expect the eval result to contain EOF *then* a value.
David A. Holland
parents: 63
diff changeset
501 if (num >= 6 &&
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
502 t6->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
503 t5->tok == T_QUES &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
504 t4->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
505 t3->tok == T_COLON &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
506 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
507 !isop(t1->tok)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
508 /* conditional expression */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
509 t6->val = t6->val ? t4->val : t2->val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
510 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
511 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
512 token_destroy(t4);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
513 token_destroy(t5);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
514 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
515 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
516 tokenarray_remove(&tokens, num-4);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
517 tokenarray_remove(&tokens, num-5);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
518 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
519 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
520
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
521 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
522 t2->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
523 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
524 complain(&t1->place, "Value expected within ()");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
525 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
526 t1->tok = T_VAL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
527 t1->val = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
528 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
529 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
530 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
531 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
532
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
533 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
534 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
535 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
536 complain(&t1->place, "Operator expected");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
537 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
538 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
539 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
540 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
541 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
542
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
543 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
544 isop(t2->tok) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
545 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
546 complain(&t1->place, "Value expected after operator");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
547 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
548 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
549 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
550 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
551 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
552
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
553 if (num == 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
554 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
555 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
556 complain(&t1->place, "Excess right parenthesis");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
557 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
558 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
559 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
560 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
561 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
562
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
563 if (num == 3 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
564 t3->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
565 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
566 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
567 complain(&t1->place, "Unclosed left parenthesis");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
568 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
569 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
570 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
571 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
572 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
573
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
574 if (num == 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
575 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
576 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
577 /* accepting state */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
578 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
579 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
580
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
581 if (num >= 1 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
582 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
583 /* any other configuration at eof is an error */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
584 complain(&t1->place, "Parse error");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
585 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
586 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
587 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
588
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
589 /* otherwise, wait for more input */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
590 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
591 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
592 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
593
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
594 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
595 void
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
596 token(struct place *p, enum tokens tok, int val)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
597 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
598 struct token *t;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
599
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
600 t = token_create(p, tok, val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
601
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
602 tokenarray_add(&tokens, t, NULL);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
603 tryreduce();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
604 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
605
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
606 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
607 int
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
608 wordval(struct place *p, char *word)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
609 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
610 unsigned long val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
611 char *t;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
612
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
613 if (word[0] >= '0' && word[0] <= '9') {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
614 errno = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
615 val = strtoul(word, &t, 0);
96
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
616 if (errno) {
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
617 complain(p, "Invalid integer constant");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
618 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
619 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
620 }
96
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
621 while (*t == 'U' || *t == 'L') {
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
622 t++;
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
623 }
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
624 if (*t != '\0') {
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
625 complain(p, "Trailing garbage after integer constant");
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
626 complain_fail();
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
627 return 0;
408331be8792 Accept [UL]* after integer constants.
David A. Holland
parents: 92
diff changeset
628 }
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
629 if (val > INT_MAX) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
630 complain(p, "Integer constant too large");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
631 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
632 return INT_MAX;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
633 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
634 return val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
635 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
636
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
637 /* if it's a symbol, warn and substitute 0. */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
638 if (warns.undef) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
639 complain(p, "Warning: value of undefined symbol %s is 0",
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
640 word);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
641 if (mode.werror) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
642 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
643 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
644 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
645 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
646 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
647
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
648 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
649 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
650 check_word(struct place *p, char *expr, size_t pos, size_t *len_ret)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
651 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
652 size_t len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
653 int val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
654 char tmp;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
655
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
656 if (!strchr(alnum, expr[pos])) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
657 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
658 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
659 len = strspn(expr + pos, alnum);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
660 tmp = expr[pos + len];
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
661 expr[pos + len] = '\0';
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
662 val = wordval(p, expr + pos);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
663 expr[pos + len] = tmp;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
664 token(p, T_VAL, val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
665 *len_ret = len;
9dda765ee85c expression evaluator
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parents:
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666 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
667 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
668
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
669 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
670 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
671 check_tokens_2(struct place *p, char *expr, size_t pos)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
672 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
673 unsigned i;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
674
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
675 for (i=0; i<num_tokens_2; i++) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
676 if (expr[pos] == tokens_2[i].c1 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
677 expr[pos+1] == tokens_2[i].c2) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
678 token(p, tokens_2[i].tok, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
679 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
680 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
681 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
682 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
683 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
684
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
685 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
686 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
687 check_tokens_1(struct place *p, char *expr, size_t pos)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
688 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
689 unsigned i;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
690
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
691 for (i=0; i<num_tokens_1; i++) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
692 if (expr[pos] == tokens_1[i].c1) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
693 token(p, tokens_1[i].tok, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
694 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
695 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
696 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
697 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
698 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
699
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
700 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
701 void
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
702 tokenize(struct place *p, char *expr)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
703 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
704 size_t pos, len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
705
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
706 pos = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
707 while (expr[pos] != '\0') {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
708 len = strspn(expr+pos, ws);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
709 pos += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
710 p->column += len;
63
5e24746d8335 Assert on trailing whitespace.
David A. Holland
parents: 47
diff changeset
711 /* trailing whitespace is supposed to have been pruned */
5e24746d8335 Assert on trailing whitespace.
David A. Holland
parents: 47
diff changeset
712 assert(expr[pos] != '\0');
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
713 if (check_word(p, expr, pos, &len)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
714 pos += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
715 p->column += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
716 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
717 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
718 if (check_tokens_2(p, expr, pos)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
719 pos += 2;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
720 p->column += 2;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
721 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
722 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
723 if (check_tokens_1(p, expr, pos)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
724 pos++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
725 p->column++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
726 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
727 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
728 complain(p, "Invalid character %u in #if-expression",
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
729 (unsigned char)expr[pos]);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
730 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
731 pos++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
732 p->column++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
733 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
734 token(p, T_EOF, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
735 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
736
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
737 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
738 eval(struct place *p, char *expr)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
739 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
740 struct token *t1, *t2;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
741 unsigned num;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
742 bool result;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
743
92
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
744 #ifdef DEBUG
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
745 fprintf(stderr, "eval: %s\n", expr);
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
746 #endif
b127a69061b2 fix some bugs.
David A. Holland
parents: 91
diff changeset
747
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
748 tokenarray_init(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
749 tokenize(p, expr);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
750
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
751 result = false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
752 num = tokenarray_num(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
753 if (num == 2) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
754 t1 = tokenarray_get(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
755 t2 = tokenarray_get(&tokens, num-2);
91
bd1b7a09da89 Don't expect the eval result to contain EOF *then* a value.
David A. Holland
parents: 63
diff changeset
756 if (t2->tok == T_VAL &&
bd1b7a09da89 Don't expect the eval result to contain EOF *then* a value.
David A. Holland
parents: 63
diff changeset
757 t1->tok == T_EOF) {
bd1b7a09da89 Don't expect the eval result to contain EOF *then* a value.
David A. Holland
parents: 63
diff changeset
758 result = t2->val != 0;
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
759 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
760 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
761
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
762 tokenarray_destroyall(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
763 tokenarray_cleanup(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
764 return result;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
765 }