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5222 | serge | 1 | /* depend.c - Handle dependency tracking. |
2 | Copyright 1997, 1998, 2000, 2001, 2003, 2004, 2005, 2007 |
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3 | Free Software Foundation, Inc. |
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4 | |||
5 | This file is part of GAS, the GNU Assembler. |
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6 | |||
7 | GAS is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 3, or (at your option) |
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10 | any later version. |
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11 | |||
12 | GAS is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with GAS; see the file COPYING. If not, write to the Free |
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19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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20 | 02110-1301, USA. */ |
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21 | |||
22 | #include "as.h" |
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23 | #include "filenames.h" |
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24 | |||
25 | /* The file to write to, or NULL if no dependencies being kept. */ |
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26 | static char * dep_file = NULL; |
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27 | |||
28 | struct dependency |
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29 | { |
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30 | char * file; |
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31 | struct dependency * next; |
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32 | }; |
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33 | |||
34 | /* All the files we depend on. */ |
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35 | static struct dependency * dep_chain = NULL; |
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36 | |||
37 | /* Current column in output file. */ |
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38 | static int column = 0; |
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39 | |||
40 | static int quote_string_for_make (FILE *, char *); |
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41 | static void wrap_output (FILE *, char *, int); |
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42 | |||
43 | /* Number of columns allowable. */ |
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44 | #define MAX_COLUMNS 72 |
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45 | |||
46 | /* Start saving dependencies, to be written to FILENAME. If this is |
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47 | never called, then dependency tracking is simply skipped. */ |
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48 | |||
49 | void |
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50 | start_dependencies (char *filename) |
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51 | { |
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52 | dep_file = filename; |
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53 | } |
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54 | |||
55 | /* Noticed a new filename, so try to register it. */ |
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56 | |||
57 | void |
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58 | register_dependency (char *filename) |
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59 | { |
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60 | struct dependency *dep; |
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61 | |||
62 | if (dep_file == NULL) |
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63 | return; |
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64 | |||
65 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
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66 | { |
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67 | if (!filename_cmp (filename, dep->file)) |
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68 | return; |
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69 | } |
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70 | |||
71 | dep = (struct dependency *) xmalloc (sizeof (struct dependency)); |
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72 | dep->file = xstrdup (filename); |
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73 | dep->next = dep_chain; |
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74 | dep_chain = dep; |
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75 | } |
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76 | |||
77 | /* Quote a file name the way `make' wants it, and print it to FILE. |
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78 | If FILE is NULL, do no printing, but return the length of the |
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79 | quoted string. |
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80 | |||
81 | This code is taken from gcc with only minor changes. */ |
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82 | |||
83 | static int |
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84 | quote_string_for_make (FILE *file, char *src) |
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85 | { |
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86 | char *p = src; |
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87 | int i = 0; |
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88 | |||
89 | for (;;) |
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90 | { |
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91 | char c = *p++; |
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92 | |||
93 | switch (c) |
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94 | { |
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95 | case '\0': |
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96 | case ' ': |
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97 | case '\t': |
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98 | { |
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99 | /* GNU make uses a weird quoting scheme for white space. |
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100 | A space or tab preceded by 2N+1 backslashes represents |
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101 | N backslashes followed by space; a space or tab |
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102 | preceded by 2N backslashes represents N backslashes at |
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103 | the end of a file name; and backslashes in other |
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104 | contexts should not be doubled. */ |
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105 | char *q; |
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106 | |||
107 | for (q = p - 1; src < q && q[-1] == '\\'; q--) |
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108 | { |
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109 | if (file) |
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110 | putc ('\\', file); |
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111 | i++; |
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112 | } |
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113 | } |
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114 | if (!c) |
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115 | return i; |
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116 | if (file) |
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117 | putc ('\\', file); |
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118 | i++; |
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119 | goto ordinary_char; |
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120 | |||
121 | case '$': |
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122 | if (file) |
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123 | putc (c, file); |
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124 | i++; |
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125 | /* Fall through. This can mishandle things like "$(" but |
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126 | there's no easy fix. */ |
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127 | default: |
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128 | ordinary_char: |
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129 | /* This can mishandle characters in the string "\0\n%*?[\\~"; |
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130 | exactly which chars are mishandled depends on the `make' version. |
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131 | We know of no portable solution for this; |
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132 | even GNU make 3.76.1 doesn't solve the problem entirely. |
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133 | (Also, '\0' is mishandled due to our calling conventions.) */ |
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134 | if (file) |
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135 | putc (c, file); |
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136 | i++; |
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137 | break; |
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138 | } |
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139 | } |
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140 | } |
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141 | |||
142 | /* Append some output to the file, keeping track of columns and doing |
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143 | wrapping as necessary. */ |
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144 | |||
145 | static void |
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146 | wrap_output (FILE *f, char *string, int spacer) |
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147 | { |
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148 | int len = quote_string_for_make (NULL, string); |
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149 | |||
150 | if (len == 0) |
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151 | return; |
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152 | |||
153 | if (column |
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154 | && (MAX_COLUMNS |
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155 | - 1 /* spacer */ |
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156 | - 2 /* ` \' */ |
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157 | < column + len)) |
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158 | { |
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159 | fprintf (f, " \\\n "); |
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160 | column = 0; |
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161 | if (spacer == ' ') |
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162 | spacer = '\0'; |
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163 | } |
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164 | |||
165 | if (spacer == ' ') |
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166 | { |
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167 | putc (spacer, f); |
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168 | ++column; |
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169 | } |
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170 | |||
171 | quote_string_for_make (f, string); |
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172 | column += len; |
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173 | |||
174 | if (spacer == ':') |
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175 | { |
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176 | putc (spacer, f); |
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177 | ++column; |
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178 | } |
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179 | } |
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180 | |||
181 | /* Print dependency file. */ |
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182 | |||
183 | void |
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184 | print_dependencies (void) |
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185 | { |
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186 | FILE *f; |
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187 | struct dependency *dep; |
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188 | |||
189 | if (dep_file == NULL) |
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190 | return; |
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191 | |||
192 | f = fopen (dep_file, FOPEN_WT); |
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193 | if (f == NULL) |
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194 | { |
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195 | as_warn (_("can't open `%s' for writing"), dep_file); |
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196 | return; |
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197 | } |
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198 | |||
199 | column = 0; |
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200 | wrap_output (f, out_file_name, ':'); |
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201 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
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202 | wrap_output (f, dep->file, ' '); |
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203 | |||
204 | putc ('\n', f); |
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205 | |||
206 | if (fclose (f)) |
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207 | as_warn (_("can't close `%s'"), dep_file); |
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208 | }>> |