annotate directive.c @ 65:161edab0d361

test undef
author David A. Holland
date Sun, 31 Mar 2013 02:18:24 -0400
parents f50b4ea6cbfe
children f8507e5ed84c
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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 #include "output.h"
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43
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44 struct ifstate {
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45 struct ifstate *prev;
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46 struct place startplace;
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47 bool curtrue;
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48 bool evertrue;
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49 bool seenelse;
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50 };
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51
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52 static struct ifstate *ifstate;
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53 static bool in_multiline_comment;
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54
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55 ////////////////////////////////////////////////////////////
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56 // common parsing bits
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57
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58 static
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59 void
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60 uncomment(char *buf)
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61 {
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62 char *s, *t, *u = NULL;
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63 bool incomment = false;
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64
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65 for (s = t = buf; *s; s++) {
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66 if (incomment) {
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67 if (s[0] == '*' && s[1] == '/') {
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68 s++;
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69 incomment = false;
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70 }
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71 } else {
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72 if (s[0] == '/' && s[1] == '*') {
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73 incomment = true;
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74 } else {
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75 if (t != s) {
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76 *t = *s;
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77 }
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78 if (!strchr(ws, *t)) {
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79 u = t;
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80 }
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81 t++;
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82 }
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83 }
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84 }
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85 if (u) {
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86 /* end string after last non-whitespace char */
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87 u[1] = '\0';
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88 } else {
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89 *t = '\0';
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90 }
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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 oneword(const char *what, struct place *p2, char *line)
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96 {
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97 size_t pos;
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98
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99 pos = strcspn(line, ws);
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100 if (line[pos] != '\0') {
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101 p2->column += pos;
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102 complain(p2, "Garbage after %s argument", what);
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103 complain_fail();
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104 line[pos] = '\0';
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105 }
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106 }
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107
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108 ////////////////////////////////////////////////////////////
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109 // if handling
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110
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111 static
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112 struct ifstate *
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113 ifstate_create(struct ifstate *prev, struct place *p, bool startstate)
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114 {
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115 struct ifstate *is;
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116
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117 is = domalloc(sizeof(*is));
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118 is->prev = prev;
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119 if (p != NULL) {
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120 is->startplace = *p;
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121 } else {
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122 place_setbuiltin(&is->startplace, 1);
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123 }
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124 is->curtrue = startstate;
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125 is->evertrue = is->curtrue;
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126 is->seenelse = false;
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127 return is;
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128 }
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129
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130 static
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131 void
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132 ifstate_destroy(struct ifstate *is)
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133 {
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134 dofree(is, sizeof(*is));
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135 }
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136
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137 static
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138 void
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139 ifstate_push(struct place *p, bool startstate)
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140 {
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141 ifstate = ifstate_create(ifstate, p, startstate);
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142 }
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143
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144 static
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145 void
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146 ifstate_pop(void)
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147 {
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148 struct ifstate *is;
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149
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150 is = ifstate;
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151 ifstate = ifstate->prev;
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152 ifstate_destroy(is);
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153 }
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154
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155 static
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156 void
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157 d_if(struct place *p, struct place *p2, char *line)
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158 {
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159 char *expr;
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160 bool val;
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161 struct place p3 = *p2;
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162
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163 uncomment(line);
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164 expr = macroexpand(p2, line, strlen(line), true);
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165 val = eval(&p3, expr);
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166 ifstate_push(p, val);
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167 dostrfree(expr);
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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_ifdef(struct place *p, struct place *p2, char *line)
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173 {
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174 uncomment(line);
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175 oneword("#ifdef", p2, line);
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176 ifstate_push(p, macro_isdefined(line));
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177 }
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178
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179 static
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180 void
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181 d_ifndef(struct place *p, struct place *p2, char *line)
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182 {
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183 uncomment(line);
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184 oneword("#ifndef", p2, line);
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185 ifstate_push(p, !macro_isdefined(line));
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186 }
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187
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188 static
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189 void
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190 d_elif(struct place *p, struct place *p2, char *line)
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191 {
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192 char *expr;
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193 struct place p3 = *p2;
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194
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195 if (ifstate->seenelse) {
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196 complain(p, "#elif after #else");
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197 complain_fail();
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198 }
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199
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200 if (ifstate->evertrue) {
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201 ifstate->curtrue = false;
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202 } else {
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203 uncomment(line);
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204 expr = macroexpand(p2, line, strlen(line), true);
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205 ifstate->curtrue = eval(&p3, expr);
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206 ifstate->evertrue = ifstate->curtrue;
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207 dostrfree(expr);
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208 }
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209 }
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210
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211 static
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212 void
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213 d_else(struct place *p, struct place *p2, char *line)
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214 {
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215 if (ifstate->seenelse) {
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216 complain(p, "Multiple #else directives in one conditional");
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217 complain_fail();
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218 }
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219
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220 ifstate->curtrue = !ifstate->evertrue;
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221 ifstate->evertrue = true;
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222 ifstate->seenelse = true;
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223 }
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224
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225 static
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226 void
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227 d_endif(struct place *p, struct place *p2, char *line)
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228 {
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229 if (ifstate->prev == NULL) {
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230 complain(p, "Unmatched #endif");
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231 complain_fail();
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232 } else {
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233 ifstate_pop();
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234 }
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235 }
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236
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237 ////////////////////////////////////////////////////////////
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238 // macros
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239
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240 static
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241 void
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242 d_define(struct place *p, struct place *p2, char *line)
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243 {
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244 size_t pos, argpos;
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245 struct place p3, p4;
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246
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247 /*
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248 * line may be:
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249 * macro expansion
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250 * macro(arg, arg, ...) expansion
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251 */
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252
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253 pos = strcspn(line, " \t\f\v(");
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254 if (line[pos] == '(') {
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255 line[pos++] = '\0';
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256 argpos = pos;
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257 pos = pos + strcspn(line+pos, "()");
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258 if (line[pos] == '(') {
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259 p2->column += pos;
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260 complain(p2, "Left parenthesis in macro parameters");
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261 complain_fail();
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262 return;
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263 }
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264 if (line[pos] != ')') {
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265 p2->column += pos;
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266 complain(p2, "Unclosed macro parameter list");
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267 complain_fail();
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268 return;
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269 }
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270 line[pos++] = '\0';
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a489cc223483 Don't demand space after the macro argument parenthesis.
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271 #if 0
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272 if (!strchr(ws, line[pos])) {
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273 p2->column += pos;
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274 complain(p2, "Trash after macro parameter list");
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275 complain_fail();
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276 return;
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277 }
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278 #endif
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279 } else if (line[pos] == '\0') {
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280 argpos = 0;
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281 } else {
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282 line[pos++] = '\0';
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283 argpos = 0;
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284 }
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285
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286 pos += strspn(line+pos, ws);
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287
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288 p3 = *p2;
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289 p3.column += argpos;
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290
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291 p4 = *p2;
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292 p4.column += pos;
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293
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294 if (argpos) {
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295 macro_define_params(p2, line, &p3,
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296 line + argpos, &p4,
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297 line + pos);
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298 } else {
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299 macro_define_plain(p2, line, &p4, line + pos);
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300 }
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301 }
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302
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303 static
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304 void
64
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305 d_undef(struct place *p, struct place *p2, char *line)
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306 {
64
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307 uncomment(line);
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308 oneword("#undef", p2, line);
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309 macro_undef(line);
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310 }
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311
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312 ////////////////////////////////////////////////////////////
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313 // includes
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314
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315 static
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316 bool
64
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317 tryinclude(struct place *p, char *line)
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318 {
64
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319 size_t len;
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320
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321 len = strlen(line);
15
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322 if (len > 2 && line[0] == '"' && line[len-1] == '"') {
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323 line[len-1] = '\0';
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324 file_readquote(p, line+1);
62
90c6052410ce Don't truncate the candidate include path strings.
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325 line[len-1] = '"';
15
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326 return true;
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327 }
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328 if (len > 2 && line[0] == '<' && line[len-1] == '>') {
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329 line[len-1] = '\0';
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330 file_readbracket(p, line+1);
62
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331 line[len-1] = '>';
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332 return true;
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333 }
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334 return false;
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335 }
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336
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337 static
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338 void
64
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339 d_include(struct place *p, struct place *p2, char *line)
15
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340 {
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341 char *text;
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342
64
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343 uncomment(line);
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344 if (tryinclude(p, line)) {
15
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345 return;
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346 }
64
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347 text = macroexpand(p2, line, strlen(line), false);
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348 if (tryinclude(p, text)) {
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349 dostrfree(text);
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350 return;
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351 }
39
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352 dostrfree(text);
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353 complain(p, "Illegal #include directive");
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354 complain_fail();
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355 }
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356
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357 static
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358 void
64
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359 d_line(struct place *p, struct place *p2, char *line)
15
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360 {
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361 /* XXX */
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362 complain(p, "Sorry, no #line yet");
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363 }
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364
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365 ////////////////////////////////////////////////////////////
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366 // messages
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367
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368 static
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369 void
64
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370 d_warning(struct place *p, struct place *p2, char *line)
15
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371 {
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372 char *msg;
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373
64
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374 msg = macroexpand(p2, line, strlen(line), false);
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375 complain(p, "#warning: %s", msg);
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diff changeset
376 if (mode.werror) {
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diff changeset
377 complain_fail();
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diff changeset
378 }
39
337110e7240a Pass the size to free; it makes debug checking easier.
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diff changeset
379 dostrfree(msg);
15
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380 }
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381
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diff changeset
382 static
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383 void
64
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
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diff changeset
384 d_error(struct place *p, struct place *p2, char *line)
15
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385 {
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diff changeset
386 char *msg;
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diff changeset
387
64
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diff changeset
388 msg = macroexpand(p2, line, strlen(line), false);
15
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389 complain(p, "#error: %s", msg);
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diff changeset
390 complain_fail();
39
337110e7240a Pass the size to free; it makes debug checking easier.
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diff changeset
391 dostrfree(msg);
15
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392 }
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393
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394 ////////////////////////////////////////////////////////////
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395 // other
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396
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diff changeset
397 static
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398 void
64
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
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diff changeset
399 d_pragma(struct place *p, struct place *p2, char *line)
15
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400 {
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401 complain(p, "#pragma %s", line);
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diff changeset
402 complain_fail();
f6177d3ed5c2 handle directives
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diff changeset
403 }
f6177d3ed5c2 handle directives
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diff changeset
404
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diff changeset
405 ////////////////////////////////////////////////////////////
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diff changeset
406 // directive table
f6177d3ed5c2 handle directives
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diff changeset
407
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diff changeset
408 static const struct {
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409 const char *name;
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410 bool ifskip;
64
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diff changeset
411 void (*func)(struct place *, struct place *, char *line);
15
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412 } directives[] = {
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413 { "define", true, d_define },
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414 { "elif", false, d_elif },
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parents:
diff changeset
415 { "else", false, d_else },
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diff changeset
416 { "endif", false, d_endif },
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diff changeset
417 { "error", true, d_error },
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parents:
diff changeset
418 { "if", false, d_if },
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diff changeset
419 { "ifdef", false, d_ifdef },
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parents:
diff changeset
420 { "ifndef", false, d_ifndef },
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diff changeset
421 { "include", true, d_include },
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parents:
diff changeset
422 { "line", true, d_line },
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423 { "pragma", true, d_pragma },
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diff changeset
424 { "undef", true, d_undef },
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425 { "warning", true, d_warning },
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426 };
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427 static const unsigned numdirectives = HOWMANY(directives);
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428
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429 static
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430 void
64
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diff changeset
431 directive_gotdirective(struct place *p, char *line)
15
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432 {
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433 struct place p2;
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434 size_t len, skip;
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435 unsigned i;
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diff changeset
436
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437 p2 = *p;
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438 for (i=0; i<numdirectives; i++) {
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439 len = strlen(directives[i].name);
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440 if (!strncmp(line, directives[i].name, len) &&
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441 strchr(ws, line[len])) {
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442 if (directives[i].ifskip && !ifstate->curtrue) {
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443 return;
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444 }
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445 skip = len + strspn(line+len, ws);
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446 p2.column += skip;
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447 line += skip;
64
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diff changeset
448
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449 len = strlen(line);
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450 len = notrailingws(line, len);
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451 if (len < strlen(line)) {
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452 line[len] = '\0';
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453 }
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454 directives[i].func(p, &p2, line);
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455 return;
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456 }
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457 }
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diff changeset
458 skip = strcspn(line, ws);
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459 complain(p, "Unknown directive #%.*s", (int)skip, line);
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460 complain_fail();
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461 }
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462
49
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463 /*
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464 * If desired, warn about a nested comment. The comment begins at
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diff changeset
465 * offset POS from the place P.
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466 */
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467 static
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468 void
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diff changeset
469 warn_nestcomment(const struct place *p, size_t pos)
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diff changeset
470 {
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diff changeset
471 struct place p2;
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472
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diff changeset
473 if (warns.nestcomment) {
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474 p2 = *p;
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475 p2.column += pos;
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476 complain(p, "Warning: %c%c within comment",
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diff changeset
477 '/', '*');
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diff changeset
478 if (mode.werror) {
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diff changeset
479 complain_failed();
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diff changeset
480 }
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481 }
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diff changeset
482 }
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diff changeset
483
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diff changeset
484 /*
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diff changeset
485 * Check for comment delimiters in LINE. If a multi-line comment is
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diff changeset
486 * continuing or ending, set ACOMM to its length. If a multi-line
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diff changeset
487 * comment is starting, set BCOMM to its length. Set TEXT to the
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diff changeset
488 * length of text that is not commented out, or that contains comments
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diff changeset
489 * that both begin and end on this line. ACOMM + TEXT + BCOMM == LEN.
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diff changeset
490 *
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diff changeset
491 * Updates in_multiline_comment to the appropriate state for after
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diff changeset
492 * this line is handled.
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parents: 39
diff changeset
493 */
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diff changeset
494 static
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diff changeset
495 size_t
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diff changeset
496 directive_scancomments(const struct place *p, char *line, size_t len,
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diff changeset
497 size_t *acomm, size_t *text, size_t *bcomm)
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parents: 39
diff changeset
498 {
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diff changeset
499 size_t pos;
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parents: 39
diff changeset
500 size_t first_commentend;
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parents: 39
diff changeset
501 size_t last_commentstart;
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diff changeset
502 bool incomment;
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diff changeset
503
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parents: 39
diff changeset
504 first_commentend = len;
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parents: 39
diff changeset
505 last_commentstart = len;
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diff changeset
506 incomment = in_multiline_comment;
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David A. Holland
parents: 39
diff changeset
507 for (pos = 0; pos+1 < len; pos++) {
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diff changeset
508 if (line[pos] == '/' && line[pos+1] == '*') {
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David A. Holland
parents: 39
diff changeset
509 if (incomment) {
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David A. Holland
parents: 39
diff changeset
510 warn_nestcomment(p, pos);
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David A. Holland
parents: 39
diff changeset
511 } else {
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diff changeset
512 incomment = true;
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diff changeset
513 last_commentstart = pos;
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David A. Holland
parents: 39
diff changeset
514 }
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parents: 39
diff changeset
515 } else if (line[pos] == '*' && line[pos+1] == '/') {
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parents: 39
diff changeset
516 if (incomment) {
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David A. Holland
parents: 39
diff changeset
517 incomment = false;
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David A. Holland
parents: 39
diff changeset
518 if (first_commentend == len) {
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David A. Holland
parents: 39
diff changeset
519 first_commentend = pos;
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David A. Holland
parents: 39
diff changeset
520 }
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parents: 39
diff changeset
521 last_commentstart = len;
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David A. Holland
parents: 39
diff changeset
522 } else {
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parents: 39
diff changeset
523 /* stray end-comment; should we care? */
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David A. Holland
parents: 39
diff changeset
524 }
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
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parents: 39
diff changeset
525 }
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David A. Holland
parents: 39
diff changeset
526 }
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David A. Holland
parents: 39
diff changeset
527
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parents: 39
diff changeset
528 if (in_multiline_comment && first_commentend < last_commentstart) {
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parents: 39
diff changeset
529 /* multiline comment ends */
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parents: 39
diff changeset
530 /* first_commentend points to the star, adjust */
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parents: 39
diff changeset
531 *acomm = first_commentend + 2;
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David A. Holland
parents: 39
diff changeset
532 *text = len - *acomm;
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David A. Holland
parents: 39
diff changeset
533 } else if (in_multiline_comment) {
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David A. Holland
parents: 39
diff changeset
534 /* comment did not end, so another one cannot have started */
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David A. Holland
parents: 39
diff changeset
535 assert(last_commentstart == len);
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David A. Holland
parents: 39
diff changeset
536 *acomm = len;
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David A. Holland
parents: 39
diff changeset
537 *text = 0;
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parents: 39
diff changeset
538 } else {
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parents: 39
diff changeset
539 *acomm = 0;
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David A. Holland
parents: 39
diff changeset
540 *text = len;
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
541 }
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David A. Holland
parents: 39
diff changeset
542
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
543 *bcomm = len - last_commentstart;
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David A. Holland
parents: 39
diff changeset
544 *text -= *bcomm;
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David A. Holland
parents: 39
diff changeset
545
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David A. Holland
parents: 39
diff changeset
546 in_multiline_comment = incomment;
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David A. Holland
parents: 39
diff changeset
547 return len;
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David A. Holland
parents: 39
diff changeset
548 }
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parents: 39
diff changeset
549
15
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diff changeset
550 void
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diff changeset
551 directive_gotline(struct place *p, char *line, size_t len)
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parents:
diff changeset
552 {
49
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
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parents: 39
diff changeset
553 size_t acomm; /* length of comment ending on this line */
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parents: 39
diff changeset
554 size_t text; /* length of non-multi-line-comment text */
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parents: 39
diff changeset
555 size_t bcomm; /* length of comment beginning on this line */
15
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parents:
diff changeset
556 size_t skip;
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
557
49
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parents: 39
diff changeset
558 directive_scancomments(p, line, len, &acomm, &text, &bcomm);
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David A. Holland
parents: 39
diff changeset
559
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David A. Holland
parents: 39
diff changeset
560 if (acomm > 0) {
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David A. Holland
parents: 39
diff changeset
561 if (mode.output_retain_comments && ifstate->curtrue) {
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David A. Holland
parents: 39
diff changeset
562 /*
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
563 * Do not expand the comment; send it straight
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
564 * to the output. This will cause it to appear
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
565 * first if we're partway through collecting a
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David A. Holland
parents: 39
diff changeset
566 * macro argument. Too bad. This isn't a
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
567 * standard mode anyway.
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David A. Holland
parents: 39
diff changeset
568 */
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David A. Holland
parents: 39
diff changeset
569 output(p, line, acomm);
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David A. Holland
parents: 39
diff changeset
570 }
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parents: 39
diff changeset
571 p->column += acomm;
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David A. Holland
parents: 39
diff changeset
572 }
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David A. Holland
parents: 39
diff changeset
573
15
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
574 /* check if we have a directive line */
49
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
575 skip = strspn(line + acomm, ws);
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
David A. Holland
parents: 39
diff changeset
576 if (acomm == 0 && line[skip] == '#') {
64
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
577 char ch;
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
578
15
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
579 skip = skip + 1 + strspn(line + skip + 1, ws);
49
8a204d153398 Intercept multiline comments earlier. Leave same-line comments alone.
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parents: 39
diff changeset
580 assert(skip <= text);
15
f6177d3ed5c2 handle directives
David A. Holland
parents:
diff changeset
581 p->column += skip;
64
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
582 assert(line[len] == '\0');
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
583 /* ensure null termination for directives */
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
584 ch = line[text];
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
585 if (ch != '\0') {
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
586 line[text] = '\0';
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
parents: 62
diff changeset
587 }
f50b4ea6cbfe Prune single-line comments from (most) directive lines.
David A. Holland
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588 directive_gotdirective(p, line+skip /*, length = text-skip */);
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589 line[text] = ch;
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590 p->column += text-skip;
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591 } else if (ifstate->curtrue) {
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592 macro_sendline(p, line + acomm, text);
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593 p->column += text;
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594 }
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595
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596 if (bcomm > 0) {
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597 if (mode.output_retain_comments && ifstate->curtrue) {
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598 output(p, line + acomm + text, bcomm);
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599 }
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600 p->column += bcomm;
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601 }
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602 }
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603
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604 void
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605 directive_goteof(struct place *p)
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606 {
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607 while (ifstate->prev != NULL) {
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608 complain(p, "Missing #endif");
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609 complain(&ifstate->startplace, "...opened at this point");
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610 complain_failed();
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611 ifstate_pop();
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612 }
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613 macro_sendeof(p);
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614 }
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615
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616 ////////////////////////////////////////////////////////////
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617 // module initialization
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618
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619 void
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620 directive_init(void)
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621 {
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622 ifstate = ifstate_create(NULL, NULL, true);
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623 }
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624
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625 void
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626 directive_cleanup(void)
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627 {
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628 assert(ifstate->prev == NULL);
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629 ifstate_destroy(ifstate);
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630 ifstate = NULL;
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631 }