annotate directive.c @ 48:0af03c5571e0

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author David A. Holland
date Sat, 30 Mar 2013 23:29:08 -0400
parents 337110e7240a
children 8a204d153398
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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 <assert.h>
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31 #include <stdbool.h>
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32 #include <stdlib.h>
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33 #include <string.h>
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34
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35 #include "utils.h"
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36 #include "mode.h"
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37 #include "place.h"
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38 #include "files.h"
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39 #include "directive.h"
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40 #include "macro.h"
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41 #include "eval.h"
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42
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43 struct ifstate {
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44 struct ifstate *prev;
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45 struct place startplace;
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46 bool curtrue;
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47 bool evertrue;
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48 bool seenelse;
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49 };
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50
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51 static struct ifstate *ifstate;
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52
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53 ////////////////////////////////////////////////////////////
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54 // common parsing bits
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55
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56 static
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57 void
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58 oneword(const char *what, struct place *p2, char *line)
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59 {
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60 size_t pos;
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61
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62 pos = strcspn(line, ws);
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63 if (line[pos] != '\0') {
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64 p2->column += pos;
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65 complain(p2, "Garbage after %s argument", what);
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66 complain_fail();
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67 line[pos] = '\0';
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68 }
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69 }
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70
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71 ////////////////////////////////////////////////////////////
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72 // if handling
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73
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74 static
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75 struct ifstate *
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76 ifstate_create(struct ifstate *prev, struct place *p, bool startstate)
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77 {
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78 struct ifstate *is;
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79
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80 is = domalloc(sizeof(*is));
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81 is->prev = prev;
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82 if (p != NULL) {
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83 is->startplace = *p;
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84 } else {
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85 place_setbuiltin(&is->startplace, 1);
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86 }
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87 is->curtrue = startstate;
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88 is->evertrue = is->curtrue;
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89 is->seenelse = false;
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90 return is;
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91 }
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92
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93 static
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94 void
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95 ifstate_destroy(struct ifstate *is)
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96 {
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97 dofree(is, sizeof(*is));
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98 }
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99
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100 static
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101 void
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102 ifstate_push(struct place *p, bool startstate)
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103 {
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104 ifstate = ifstate_create(ifstate, p, startstate);
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105 }
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106
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107 static
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108 void
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109 ifstate_pop(void)
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110 {
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111 struct ifstate *is;
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112
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113 is = ifstate;
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114 ifstate = ifstate->prev;
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115 ifstate_destroy(is);
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116 }
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117
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118 static
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119 void
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120 d_if(struct place *p, struct place *p2, char *line, size_t len)
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121 {
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122 char *expr;
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123 bool val;
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124 struct place p3 = *p2;
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125
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126 expr = macroexpand(p2, line, len, true);
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127 val = eval(&p3, expr);
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128 ifstate_push(p, val);
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129 dostrfree(expr);
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130 }
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131
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132 static
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133 void
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134 d_ifdef(struct place *p, struct place *p2, char *line, size_t len)
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135 {
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136 oneword("#ifdef", p2, line);
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137 ifstate_push(p, macro_isdefined(line));
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138 }
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139
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140 static
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141 void
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142 d_ifndef(struct place *p, struct place *p2, char *line, size_t len)
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143 {
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144 oneword("#ifndef", p2, line);
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145 ifstate_push(p, !macro_isdefined(line));
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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 d_elif(struct place *p, struct place *p2, char *line, size_t len)
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151 {
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152 char *expr;
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153 struct place p3 = *p2;
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154
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155 if (ifstate->seenelse) {
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156 complain(p, "#elif after #else");
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157 complain_fail();
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158 }
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159
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160 if (ifstate->evertrue) {
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161 ifstate->curtrue = false;
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162 } else {
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163 expr = macroexpand(p2, line, len, true);
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164 ifstate->curtrue = eval(&p3, expr);
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165 ifstate->evertrue = ifstate->curtrue;
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166 dostrfree(expr);
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167 }
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168 }
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169
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170 static
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171 void
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172 d_else(struct place *p, struct place *p2, char *line, size_t len)
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173 {
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174 if (ifstate->seenelse) {
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175 complain(p, "Multiple #else directives in one conditional");
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176 complain_fail();
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177 }
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178
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179 ifstate->curtrue = !ifstate->evertrue;
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180 ifstate->evertrue = true;
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181 ifstate->seenelse = true;
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182 }
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183
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184 static
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185 void
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186 d_endif(struct place *p, struct place *p2, char *line, size_t len)
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187 {
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188 if (ifstate->prev == NULL) {
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189 complain(p, "Unmatched #endif");
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190 complain_fail();
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191 } else {
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192 ifstate_pop();
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193 }
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194 }
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195
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196 ////////////////////////////////////////////////////////////
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197 // macros
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198
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199 static
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200 void
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201 d_define(struct place *p, struct place *p2, char *line, size_t len)
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202 {
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203 size_t pos, argpos;
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204 struct place p3, p4;
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205
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206 /*
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207 * line may be:
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208 * macro expansion
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209 * macro(arg, arg, ...) expansion
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210 */
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211
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212 pos = strcspn(line, " \t\f\v(");
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213 if (line[pos] == '(') {
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214 line[pos++] = '\0';
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215 argpos = pos;
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216 pos = pos + strcspn(line+pos, "()");
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217 if (line[pos] == '(') {
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218 p2->column += pos;
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219 complain(p2, "Left parenthesis in macro parameters");
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220 complain_fail();
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221 return;
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222 }
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223 if (line[pos] != ')') {
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224 p2->column += pos;
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225 complain(p2, "Unclosed macro parameter list");
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226 complain_fail();
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227 return;
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228 }
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229 line[pos++] = '\0';
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a489cc223483 Don't demand space after the macro argument parenthesis.
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230 #if 0
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231 if (!strchr(ws, line[pos])) {
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232 p2->column += pos;
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233 complain(p2, "Trash after macro parameter list");
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234 complain_fail();
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235 return;
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236 }
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237 #endif
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238 } else if (line[pos] == '\0') {
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239 argpos = 0;
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240 } else {
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241 line[pos++] = '\0';
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242 argpos = 0;
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243 }
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244
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245 pos += strspn(line+pos, ws);
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246
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247 p3 = *p2;
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248 p3.column += argpos;
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249
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250 p4 = *p2;
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diff changeset
251 p4.column += pos;
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252
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253 if (argpos) {
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254 macro_define_params(p2, line, &p3,
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255 line + argpos, &p4,
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diff changeset
256 line + pos);
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257 } else {
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258 macro_define_plain(p2, line, &p4, line + pos);
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259 }
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260 }
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261
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262 static
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263 void
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264 d_undef(struct place *p, struct place *p2, char *line, size_t len)
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265 {
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266 oneword("#undef", p2, line);
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267 macro_undef(line);
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268 }
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269
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270 ////////////////////////////////////////////////////////////
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271 // includes
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272
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273 static
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274 bool
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275 tryinclude(struct place *p, char *line, size_t len)
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276 {
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277 if (len > 2 && line[0] == '"' && line[len-1] == '"') {
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278 line[len-1] = '\0';
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279 file_readquote(p, line+1);
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280 return true;
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281 }
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282 if (len > 2 && line[0] == '<' && line[len-1] == '>') {
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283 line[len-1] = '\0';
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284 file_readbracket(p, line+1);
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285 return true;
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286 }
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287 return false;
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288 }
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289
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290 static
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291 void
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292 d_include(struct place *p, struct place *p2, char *line, size_t len)
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293 {
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294 char *text;
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295
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296 if (tryinclude(p, line, len)) {
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297 return;
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298 }
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299 text = macroexpand(p2, line, len, false);
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300 if (tryinclude(p, text, strlen(text))) {
39
337110e7240a Pass the size to free; it makes debug checking easier.
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diff changeset
301 dostrfree(text);
15
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302 return;
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303 }
39
337110e7240a Pass the size to free; it makes debug checking easier.
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304 dostrfree(text);
15
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305 complain(p, "Illegal #include directive");
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306 complain_fail();
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307 }
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308
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309 static
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310 void
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311 d_line(struct place *p, struct place *p2, char *line, size_t len)
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312 {
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313 /* XXX */
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314 complain(p, "Sorry, no #line yet");
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315 }
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316
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317 ////////////////////////////////////////////////////////////
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318 // messages
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319
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320 static
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diff changeset
321 void
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322 d_warning(struct place *p, struct place *p2, char *line, size_t len)
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323 {
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324 char *msg;
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325
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326 msg = macroexpand(p2, line, len, false);
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327 complain(p, "#warning: %s", msg);
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diff changeset
328 if (mode.werror) {
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329 complain_fail();
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330 }
39
337110e7240a Pass the size to free; it makes debug checking easier.
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diff changeset
331 dostrfree(msg);
15
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332 }
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333
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diff changeset
334 static
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diff changeset
335 void
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diff changeset
336 d_error(struct place *p, struct place *p2, char *line, size_t len)
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diff changeset
337 {
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diff changeset
338 char *msg;
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339
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340 msg = macroexpand(p2, line, len, false);
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341 complain(p, "#error: %s", msg);
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342 complain_fail();
39
337110e7240a Pass the size to free; it makes debug checking easier.
David A. Holland
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diff changeset
343 dostrfree(msg);
15
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344 }
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345
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diff changeset
346 ////////////////////////////////////////////////////////////
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347 // other
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348
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349 static
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diff changeset
350 void
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diff changeset
351 d_pragma(struct place *p, struct place *p2, char *line, size_t len)
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diff changeset
352 {
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353 complain(p, "#pragma %s", line);
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354 complain_fail();
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diff changeset
355 }
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356
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diff changeset
357 ////////////////////////////////////////////////////////////
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358 // directive table
f6177d3ed5c2 handle directives
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359
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diff changeset
360 static const struct {
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diff changeset
361 const char *name;
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diff changeset
362 bool ifskip;
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363 void (*func)(struct place *, struct place *, char *line, size_t len);
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364 } directives[] = {
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diff changeset
365 { "define", true, d_define },
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diff changeset
366 { "elif", false, d_elif },
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diff changeset
367 { "else", false, d_else },
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parents:
diff changeset
368 { "endif", false, d_endif },
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diff changeset
369 { "error", true, d_error },
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diff changeset
370 { "if", false, d_if },
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parents:
diff changeset
371 { "ifdef", false, d_ifdef },
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parents:
diff changeset
372 { "ifndef", false, d_ifndef },
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diff changeset
373 { "include", true, d_include },
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parents:
diff changeset
374 { "line", true, d_line },
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parents:
diff changeset
375 { "pragma", true, d_pragma },
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parents:
diff changeset
376 { "undef", true, d_undef },
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diff changeset
377 { "warning", true, d_warning },
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diff changeset
378 };
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diff changeset
379 static const unsigned numdirectives = HOWMANY(directives);
f6177d3ed5c2 handle directives
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diff changeset
380
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diff changeset
381 static
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diff changeset
382 void
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diff changeset
383 directive_gotdirective(struct place *p, char *line, size_t linelen)
f6177d3ed5c2 handle directives
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diff changeset
384 {
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parents:
diff changeset
385 struct place p2;
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parents:
diff changeset
386 size_t len, skip;
f6177d3ed5c2 handle directives
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parents:
diff changeset
387 unsigned i;
f6177d3ed5c2 handle directives
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parents:
diff changeset
388
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diff changeset
389 p2 = *p;
f6177d3ed5c2 handle directives
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parents:
diff changeset
390 for (i=0; i<numdirectives; i++) {
f6177d3ed5c2 handle directives
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parents:
diff changeset
391 len = strlen(directives[i].name);
f6177d3ed5c2 handle directives
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parents:
diff changeset
392 if (!strncmp(line, directives[i].name, len) &&
f6177d3ed5c2 handle directives
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parents:
diff changeset
393 strchr(ws, line[len])) {
f6177d3ed5c2 handle directives
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parents:
diff changeset
394 if (directives[i].ifskip && !ifstate->curtrue) {
f6177d3ed5c2 handle directives
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parents:
diff changeset
395 return;
f6177d3ed5c2 handle directives
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parents:
diff changeset
396 }
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parents:
diff changeset
397 skip = len + strspn(line+len, ws);
f6177d3ed5c2 handle directives
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diff changeset
398 p2.column += skip;
f6177d3ed5c2 handle directives
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diff changeset
399 line += skip;
f6177d3ed5c2 handle directives
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parents:
diff changeset
400 linelen -= skip;
f6177d3ed5c2 handle directives
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parents:
diff changeset
401 linelen = notrailingws(line, linelen);
f6177d3ed5c2 handle directives
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parents:
diff changeset
402 directives[i].func(p, &p2, line, linelen);
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
403 return;
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
404 }
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
405 }
f6177d3ed5c2 handle directives
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parents:
diff changeset
406 skip = strcspn(line, ws);
f6177d3ed5c2 handle directives
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parents:
diff changeset
407 complain(p, "Unknown directive #%.*s", (int)skip, line);
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
408 complain_fail();
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
409 }
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
410
f6177d3ed5c2 handle directives
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parents:
diff changeset
411 void
f6177d3ed5c2 handle directives
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parents:
diff changeset
412 directive_gotline(struct place *p, char *line, size_t len)
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
413 {
f6177d3ed5c2 handle directives
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parents:
diff changeset
414 size_t skip;
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
415
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
416 /* check if we have a directive line */
f6177d3ed5c2 handle directives
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parents:
diff changeset
417 skip = strspn(line, ws);
f6177d3ed5c2 handle directives
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parents:
diff changeset
418 if (line[skip] == '#') {
f6177d3ed5c2 handle directives
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parents:
diff changeset
419 skip = skip + 1 + strspn(line + skip + 1, ws);
f6177d3ed5c2 handle directives
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parents:
diff changeset
420 p->column += skip;
f6177d3ed5c2 handle directives
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parents:
diff changeset
421 directive_gotdirective(p, line+skip, len-skip);
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
422 } else if (ifstate->curtrue) {
f6177d3ed5c2 handle directives
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parents:
diff changeset
423 macro_sendline(p, line, len);
f6177d3ed5c2 handle directives
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parents:
diff changeset
424 }
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
425 }
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
426
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
427
f6177d3ed5c2 handle directives
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parents:
diff changeset
428 void
f6177d3ed5c2 handle directives
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parents:
diff changeset
429 directive_goteof(struct place *p)
f6177d3ed5c2 handle directives
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parents:
diff changeset
430 {
f6177d3ed5c2 handle directives
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parents:
diff changeset
431 while (ifstate->prev != NULL) {
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432 complain(p, "Missing #endif");
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433 complain(&ifstate->startplace, "...opened at this point");
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434 complain_failed();
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435 ifstate_pop();
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436 }
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437 macro_sendeof(p);
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438 }
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439
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440 ////////////////////////////////////////////////////////////
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441 // module initialization
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442
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443 void
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444 directive_init(void)
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445 {
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446 ifstate = ifstate_create(NULL, NULL, true);
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447 }
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448
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449 void
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450 directive_cleanup(void)
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451 {
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452 assert(ifstate->prev == NULL);
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453 ifstate_destroy(ifstate);
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454 ifstate = NULL;
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455 }