annotate eval.c @ 63:5e24746d8335

Assert on trailing whitespace. (it is supposed to have been pruned by the caller)
author David A. Holland
date Sun, 31 Mar 2013 02:02:16 -0400
parents 2e25e55dba6b
children bd1b7a09da89
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #include "utils.h"
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36 #include "array.h"
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37 #include "mode.h"
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38 #include "place.h"
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39 #include "eval.h"
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40
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41 /*
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42 * e ::=
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43 * e1 ? e2 : e3
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44 * e1 || e2
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45 * e1 && e2
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46 * e1 | e2
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47 * e1 ^ e2
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48 * e1 & e2
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49 * e1 == e2 | e1 != e2
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50 * e1 < e2 | e1 <= e2 | e1 > e2 | e1 >= e2
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51 * e1 << e2 | e1 >> e2
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52 * e1 + e2 | e1 - e2
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53 * e1 * e2 | e1 / e2 | e1 % e2
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54 * !e | ~e | -e | +e
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55 * ( e ) | ident
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56 */
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57
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58 enum tokens {
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59 T_EOF, /* end of input */
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60 T_VAL, /* value */
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61 T_LPAREN, /* parens */
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62 T_RPAREN,
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63 T_PIPEPIPE, /* operators */
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64 T_AMPAMP,
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65 T_EQEQ,
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66 T_BANGEQ,
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67 T_LTEQ,
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68 T_GTEQ,
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69 T_LTLT,
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70 T_GTGT,
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71 T_QUES,
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72 T_COLON,
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73 T_PIPE,
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74 T_CARET,
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75 T_AMP,
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76 T_LT,
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77 T_GT,
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78 T_PLUS,
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79 T_MINUS,
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80 T_STAR,
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81 T_SLASH,
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82 T_PCT,
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83 T_BANG,
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84 T_TILDE,
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85 };
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86
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87 static const struct {
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88 char c1, c2;
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89 enum tokens tok;
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90 } tokens_2[] = {
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91 { '|', '|', T_PIPEPIPE },
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92 { '&', '&', T_AMPAMP },
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93 { '=', '=', T_EQEQ },
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94 { '!', '=', T_BANGEQ },
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95 { '<', '=', T_LTEQ },
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96 { '>', '=', T_GTEQ },
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97 { '<', '<', T_LTLT },
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98 { '>', '>', T_GTGT },
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99 };
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100 static const unsigned num_tokens_2 = HOWMANY(tokens_2);
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101
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102 static const struct {
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103 char c1;
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104 enum tokens tok;
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105 } tokens_1[] = {
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106 { '?', T_QUES },
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107 { ':', T_COLON },
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108 { '|', T_PIPE },
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109 { '^', T_CARET },
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110 { '&', T_AMP },
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111 { '<', T_LT },
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112 { '>', T_GT },
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113 { '+', T_PLUS },
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114 { '-', T_MINUS },
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115 { '*', T_STAR },
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116 { '/', T_SLASH },
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117 { '%', T_PCT },
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118 { '!', T_BANG },
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119 { '~', T_TILDE },
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120 { '(', T_LPAREN },
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121 { ')', T_RPAREN },
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122 };
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123 static const unsigned num_tokens_1 = HOWMANY(tokens_1);
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124
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125 struct token {
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126 struct place place;
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127 enum tokens tok;
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128 int val;
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129 };
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130 DECLARRAY(token, static __unused);
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131 DEFARRAY(token, static);
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132
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133 static struct tokenarray tokens;
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134
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135 static
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136 struct token *
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137 token_create(const struct place *p, enum tokens tok, int val)
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138 {
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139 struct token *t;
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140
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141 t = domalloc(sizeof(*t));
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142 t->place = *p;
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143 t->tok = tok;
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144 t->val = val;
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145 return t;
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146 }
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147
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148 static
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149 void
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150 token_destroy(struct token *t)
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151 {
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152 dofree(t, sizeof(*t));
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153 }
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154
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155 DESTROYALL_ARRAY(token, );
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156
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157 static
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158 bool
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159 isuop(enum tokens tok)
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160 {
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161 switch (tok) {
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162 case T_BANG:
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163 case T_TILDE:
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164 case T_MINUS:
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165 case T_PLUS:
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166 return true;
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167 default:
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168 break;
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169 }
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170 return false;
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171 }
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172
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173 static
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174 bool
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175 isbop(enum tokens tok)
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176 {
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177 switch (tok) {
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178 case T_EOF:
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179 case T_VAL:
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180 case T_LPAREN:
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181 case T_RPAREN:
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182 case T_COLON:
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183 case T_QUES:
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184 case T_BANG:
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185 case T_TILDE:
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186 return false;
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187 default:
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188 break;
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189 }
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190 return true;
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191 }
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192
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193 static
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194 bool
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195 isop(enum tokens tok)
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196 {
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197 switch (tok) {
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198 case T_EOF:
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199 case T_VAL:
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200 case T_LPAREN:
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201 case T_RPAREN:
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202 return false;
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203 default:
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204 break;
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205 }
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206 return true;
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207 }
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208
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209 static
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210 int
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211 getprec(enum tokens tok)
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212 {
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213 switch (tok) {
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214 case T_STAR: case T_SLASH: case T_PCT: return 0;
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215 case T_PLUS: case T_MINUS: return 1;
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216 case T_LTLT: case T_GTGT: return 2;
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217 case T_LT: case T_LTEQ: case T_GT: case T_GTEQ: return 3;
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218 case T_EQEQ: case T_BANGEQ: return 4;
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219 case T_AMP: return 5;
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220 case T_CARET: return 6;
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221 case T_PIPE: return 7;
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222 case T_AMPAMP: return 8;
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223 case T_PIPEPIPE: return 9;
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224 default: break;
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225 }
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226 return 10;
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227 }
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228
9dda765ee85c expression evaluator
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229 static
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230 bool
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231 looser(enum tokens t1, enum tokens t2)
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232 {
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233 return getprec(t1) > getprec(t2);
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234 }
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235
9dda765ee85c expression evaluator
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236 static
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237 int
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238 eval_uop(enum tokens op, int val)
9dda765ee85c expression evaluator
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239 {
9dda765ee85c expression evaluator
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240 switch (op) {
9dda765ee85c expression evaluator
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241 case T_BANG: val = !val; break;
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242 case T_TILDE: val = (int)~(unsigned)val; break;
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243 case T_MINUS: val = -val; break;
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244 case T_PLUS: break;
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245 default: assert(0); break;
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246 }
9dda765ee85c expression evaluator
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247 return val;
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248 }
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249
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250 static
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251 int
28
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diff changeset
252 eval_bop(struct place *p, int lv, enum tokens op, int rv)
16
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253 {
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254 unsigned mask;
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255
9dda765ee85c expression evaluator
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256 switch (op) {
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257 case T_PIPEPIPE: return lv || rv;
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258 case T_AMPAMP: return lv && rv;
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259 case T_PIPE: return (int)((unsigned)lv | (unsigned)rv);
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260 case T_CARET: return (int)((unsigned)lv ^ (unsigned)rv);
9dda765ee85c expression evaluator
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261 case T_AMP: return (int)((unsigned)lv & (unsigned)rv);
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262 case T_EQEQ: return lv == rv;
9dda765ee85c expression evaluator
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263 case T_BANGEQ: return lv != rv;
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264 case T_LT: return lv < rv;
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265 case T_GT: return lv > rv;
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266 case T_LTEQ: return lv <= rv;
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267 case T_GTEQ: return lv >= rv;
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268
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269 case T_LTLT:
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270 case T_GTGT:
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271 if (rv < 0) {
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272 complain(p, "Negative bit-shift");
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273 complain_fail();
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274 rv = 0;
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275 }
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276 if ((unsigned)rv >= CHAR_BIT * sizeof(unsigned)) {
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277 complain(p, "Bit-shift farther than type width");
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278 complain_fail();
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279 rv = 0;
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280 }
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281 if (op == T_LTLT) {
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282 return (int)((unsigned)lv << (unsigned)rv);
9dda765ee85c expression evaluator
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283 }
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284 mask = ((unsigned)-1) << (CHAR_BIT * sizeof(unsigned) - rv);
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285 lv = (int)(((unsigned)lv >> (unsigned)rv) | mask);
9dda765ee85c expression evaluator
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286 return lv;
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287
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288 case T_MINUS:
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289 if (rv == INT_MIN) {
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290 if (lv == INT_MIN) {
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291 return 0;
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292 }
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293 lv--;
9dda765ee85c expression evaluator
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294 rv++;
9dda765ee85c expression evaluator
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295 }
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296 rv = -rv;
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297 /* FALLTHROUGH */
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298 case T_PLUS:
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299 if (rv > 0 && lv > (INT_MAX - rv)) {
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300 complain(p, "Integer overflow");
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301 complain_fail();
9dda765ee85c expression evaluator
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302 return INT_MAX;
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303 }
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304 if (rv < 0 && lv < (INT_MIN - rv)) {
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305 complain(p, "Integer underflow");
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306 complain_fail();
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307 return INT_MIN;
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308 }
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309 return lv + rv;
9dda765ee85c expression evaluator
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310
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311 case T_STAR:
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312 if (rv == 0) {
9dda765ee85c expression evaluator
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313 return 0;
9dda765ee85c expression evaluator
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314 }
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315 if (rv == 1) {
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316 return lv;
9dda765ee85c expression evaluator
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317 }
9dda765ee85c expression evaluator
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diff changeset
318 if (rv == -1 && lv == INT_MIN) {
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319 lv++;
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320 lv = -lv;
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diff changeset
321 if (lv == INT_MAX) {
9dda765ee85c expression evaluator
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diff changeset
322 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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323 complain_fail();
9dda765ee85c expression evaluator
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324 return INT_MAX;
9dda765ee85c expression evaluator
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325 }
9dda765ee85c expression evaluator
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326 lv++;
9dda765ee85c expression evaluator
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327 return lv;
9dda765ee85c expression evaluator
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328 }
9dda765ee85c expression evaluator
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parents:
diff changeset
329 if (lv == INT_MIN && rv < 0) {
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330 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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331 complain_fail();
9dda765ee85c expression evaluator
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332 return INT_MAX;
9dda765ee85c expression evaluator
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parents:
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333 }
9dda765ee85c expression evaluator
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parents:
diff changeset
334 if (lv == INT_MIN && rv > 0) {
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parents:
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335 complain(p, "Integer underflow");
9dda765ee85c expression evaluator
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336 complain_fail();
9dda765ee85c expression evaluator
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337 return INT_MIN;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
338 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
339 if (rv < 0) {
9dda765ee85c expression evaluator
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diff changeset
340 rv = -rv;
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
341 lv = -lv;
9dda765ee85c expression evaluator
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parents:
diff changeset
342 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
343 if (lv > 0 && lv > INT_MAX / rv) {
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diff changeset
344 complain(p, "Integer overflow");
9dda765ee85c expression evaluator
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345 complain_fail();
9dda765ee85c expression evaluator
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346 return INT_MAX;
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parents:
diff changeset
347 }
9dda765ee85c expression evaluator
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parents:
diff changeset
348 if (lv < 0 && lv < INT_MIN / rv) {
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parents:
diff changeset
349 complain(p, "Integer underflow");
9dda765ee85c expression evaluator
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parents:
diff changeset
350 complain_fail();
9dda765ee85c expression evaluator
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diff changeset
351 return INT_MIN;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
352 }
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
353 return lv * rv;
9dda765ee85c expression evaluator
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diff changeset
354
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parents:
diff changeset
355 case T_SLASH:
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
356 if (rv == 0) {
9dda765ee85c expression evaluator
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parents:
diff changeset
357 complain(p, "Division by zero");
9dda765ee85c expression evaluator
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parents:
diff changeset
358 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
359 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
360 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
361 return lv / rv;
9dda765ee85c expression evaluator
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parents:
diff changeset
362
9dda765ee85c expression evaluator
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parents:
diff changeset
363 case T_PCT:
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
364 if (rv == 0) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
365 complain(p, "Modulus by zero");
9dda765ee85c expression evaluator
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parents:
diff changeset
366 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
367 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
368 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
369 return lv % rv;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
370
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
371 default: assert(0); break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
372 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
373 return 0;
9dda765ee85c expression evaluator
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parents:
diff changeset
374 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
375
9dda765ee85c expression evaluator
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parents:
diff changeset
376 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
377 void
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
378 tryreduce(void)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
379 {
9dda765ee85c expression evaluator
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parents:
diff changeset
380 unsigned num;
9dda765ee85c expression evaluator
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parents:
diff changeset
381 struct token *t1, *t2, *t3, *t4, *t5, *t6;
9dda765ee85c expression evaluator
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parents:
diff changeset
382
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
383 while (1) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
384 num = tokenarray_num(&tokens);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
385 t1 = (num >= 1) ? tokenarray_get(&tokens, num-1) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
386 t2 = (num >= 2) ? tokenarray_get(&tokens, num-2) : NULL;
9dda765ee85c expression evaluator
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parents:
diff changeset
387 t3 = (num >= 3) ? tokenarray_get(&tokens, num-3) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
388
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
389 if (num >= 3 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
390 t3->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
391 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
392 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
393 /* (x) -> x */
9dda765ee85c expression evaluator
David A. Holland
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diff changeset
394 t2->place = t3->place;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
395 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
396 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
397 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
398 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
399 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
400 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
401
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
402 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
403 (num == 2 || isop(t3->tok) || t3->tok == T_LPAREN) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
404 isuop(t2->tok) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
405 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
406 /* unary operator */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
407 t1->val = eval_uop(t2->tok, t1->val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
408 t1->place = t2->place;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
409 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
410 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
411 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
412 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
413 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
414 (num == 2 || isop(t3->tok) || t3->tok == T_RPAREN) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
415 t2->tok != T_LPAREN && t2->tok != T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
416 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
417 complain(&t2->place, "Invalid unary operator");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
418 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
419 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
420 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
421 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
422 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
423
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
424
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
425 t4 = (num >= 4) ? tokenarray_get(&tokens, num-4) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
426
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
427 if (num >= 4 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
428 t4->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
429 isbop(t3->tok) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
430 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
431 (isbop(t1->tok) || !isop(t1->tok))) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
432 /* binary operator */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
433 if (looser(t1->tok, t3->tok)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
434 t4->val = eval_bop(&t3->place,
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
435 t4->val, t3->tok, t2->val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
436 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
437 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
438 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
439 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
440 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
441 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
442 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
443 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
444
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
445 t5 = (num >= 5) ? tokenarray_get(&tokens, num-5) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
446 t6 = (num >= 6) ? tokenarray_get(&tokens, num-6) : NULL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
447
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
448 if (num >=6 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
449 t6->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
450 t5->tok == T_QUES &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
451 t4->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
452 t3->tok == T_COLON &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
453 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
454 !isop(t1->tok)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
455 /* conditional expression */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
456 t6->val = t6->val ? t4->val : t2->val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
457 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
458 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
459 token_destroy(t4);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
460 token_destroy(t5);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
461 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
462 tokenarray_remove(&tokens, num-3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
463 tokenarray_remove(&tokens, num-4);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
464 tokenarray_remove(&tokens, num-5);
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
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
468 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
469 t2->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
470 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
471 complain(&t1->place, "Value expected within ()");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
472 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
473 t1->tok = T_VAL;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
474 t1->val = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
475 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
476 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
477 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
478 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
479
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
480 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
481 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
482 t1->tok == T_VAL) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
483 complain(&t1->place, "Operator expected");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
484 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
485 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
486 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
487 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
488 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
489
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
490 if (num >= 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
491 isop(t2->tok) &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
492 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
493 complain(&t1->place, "Value expected after operator");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
494 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
495 token_destroy(t2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
496 tokenarray_remove(&tokens, num-2);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
497 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
498 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
499
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
500 if (num == 2 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
501 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
502 t1->tok == T_RPAREN) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
503 complain(&t1->place, "Excess right parenthesis");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
504 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
505 token_destroy(t1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
506 tokenarray_remove(&tokens, num-1);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
507 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
508 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
509
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
510 if (num == 3 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
511 t3->tok == T_LPAREN &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
512 t2->tok == T_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
513 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
514 complain(&t1->place, "Unclosed left parenthesis");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
515 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
516 token_destroy(t3);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
517 tokenarray_remove(&tokens, num-3);
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_VAL &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
523 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
524 /* accepting state */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
525 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
526 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
527
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
528 if (num >= 1 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
529 t1->tok == T_EOF) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
530 /* any other configuration at eof is an error */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
531 complain(&t1->place, "Parse error");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
532 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
533 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
534 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
535
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
536 /* otherwise, wait for more input */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
537 break;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
538 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
539 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
540
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
541 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
542 void
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
543 token(struct place *p, enum tokens tok, int val)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
544 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
545 struct token *t;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
546
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
547 t = token_create(p, tok, val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
548
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
549 tokenarray_add(&tokens, t, NULL);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
550 tryreduce();
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 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
554 int
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
555 wordval(struct place *p, char *word)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
556 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
557 unsigned long val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
558 char *t;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
559
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
560 if (word[0] >= '0' && word[0] <= '9') {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
561 errno = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
562 val = strtoul(word, &t, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
563 if (errno || *t != '\0') {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
564 complain(p, "Invalid integer constant");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
565 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
566 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
567 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
568 if (val > INT_MAX) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
569 complain(p, "Integer constant too large");
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
570 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
571 return INT_MAX;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
572 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
573 return val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
574 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
575
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
576 /* if it's a symbol, warn and substitute 0. */
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
577 if (warns.undef) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
578 complain(p, "Warning: value of undefined symbol %s is 0",
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
579 word);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
580 if (mode.werror) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
581 complain_fail();
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
582 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
583 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
584 return 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
585 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
586
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
587 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
588 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
589 check_word(struct place *p, char *expr, size_t pos, size_t *len_ret)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
590 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
591 size_t len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
592 int val;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
593 char tmp;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
594
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
595 if (!strchr(alnum, expr[pos])) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
596 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
597 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
598 len = strspn(expr + pos, alnum);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
599 tmp = expr[pos + len];
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
600 expr[pos + len] = '\0';
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
601 val = wordval(p, expr + pos);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
602 expr[pos + len] = tmp;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
603 token(p, T_VAL, val);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
604 *len_ret = len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
605 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
606 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
607
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
608 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
609 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
610 check_tokens_2(struct place *p, char *expr, size_t pos)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
611 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
612 unsigned i;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
613
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
614 for (i=0; i<num_tokens_2; i++) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
615 if (expr[pos] == tokens_2[i].c1 &&
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
616 expr[pos+1] == tokens_2[i].c2) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
617 token(p, tokens_2[i].tok, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
618 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
619 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
620 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
621 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
622 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
623
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
624 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
625 bool
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
626 check_tokens_1(struct place *p, char *expr, size_t pos)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
627 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
628 unsigned i;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
629
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
630 for (i=0; i<num_tokens_1; i++) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
631 if (expr[pos] == tokens_1[i].c1) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
632 token(p, tokens_1[i].tok, 0);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
633 return true;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
634 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
635 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
636 return false;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
637 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
638
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
639 static
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
640 void
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
641 tokenize(struct place *p, char *expr)
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
642 {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
643 size_t pos, len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
644
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
645 pos = 0;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
646 while (expr[pos] != '\0') {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
647 len = strspn(expr+pos, ws);
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
648 pos += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
649 p->column += len;
63
5e24746d8335 Assert on trailing whitespace.
David A. Holland
parents: 47
diff changeset
650 /* trailing whitespace is supposed to have been pruned */
5e24746d8335 Assert on trailing whitespace.
David A. Holland
parents: 47
diff changeset
651 assert(expr[pos] != '\0');
16
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
652 if (check_word(p, expr, pos, &len)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
653 pos += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
654 p->column += len;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
655 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
656 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
657 if (check_tokens_2(p, expr, pos)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
658 pos += 2;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
659 p->column += 2;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
660 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
661 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
662 if (check_tokens_1(p, expr, pos)) {
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
663 pos++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
664 p->column++;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
665 continue;
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
666 }
9dda765ee85c expression evaluator
David A. Holland
parents:
diff changeset
667 complain(p, "Invalid character %u in #if-expression",
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668 (unsigned char)expr[pos]);
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669 complain_fail();
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670 pos++;
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671 p->column++;
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672 }
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673 token(p, T_EOF, 0);
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674 }
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675
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676 bool
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677 eval(struct place *p, char *expr)
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678 {
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679 struct token *t1, *t2;
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680 unsigned num;
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681 bool result;
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682
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683 tokenarray_init(&tokens);
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684 tokenize(p, expr);
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685
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686 result = false;
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687 num = tokenarray_num(&tokens);
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688 if (num == 2) {
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689 t1 = tokenarray_get(&tokens, num-1);
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690 t2 = tokenarray_get(&tokens, num-2);
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691 if (t1->tok == T_VAL &&
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692 t2->tok == T_EOF) {
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693 result = t1->val != 0;
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694 }
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695 }
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696
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697 tokenarray_destroyall(&tokens);
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698 tokenarray_cleanup(&tokens);
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699 return result;
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700 }