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5222 | serge | 1 | /* depend.c - Handle dependency tracking. |
6324 | serge | 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
5222 | serge | 3 | |
4 | This file is part of GAS, the GNU Assembler. |
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5 | |||
6 | GAS is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3, or (at your option) |
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9 | any later version. |
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10 | |||
11 | GAS is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with GAS; see the file COPYING. If not, write to the Free |
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18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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19 | 02110-1301, USA. */ |
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20 | |||
21 | #include "as.h" |
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22 | #include "filenames.h" |
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23 | |||
24 | /* The file to write to, or NULL if no dependencies being kept. */ |
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25 | static char * dep_file = NULL; |
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26 | |||
27 | struct dependency |
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28 | { |
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29 | char * file; |
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30 | struct dependency * next; |
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31 | }; |
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32 | |||
33 | /* All the files we depend on. */ |
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34 | static struct dependency * dep_chain = NULL; |
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35 | |||
36 | /* Current column in output file. */ |
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37 | static int column = 0; |
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38 | |||
39 | static int quote_string_for_make (FILE *, char *); |
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40 | static void wrap_output (FILE *, char *, int); |
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41 | |||
42 | /* Number of columns allowable. */ |
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43 | #define MAX_COLUMNS 72 |
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44 | |||
45 | /* Start saving dependencies, to be written to FILENAME. If this is |
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46 | never called, then dependency tracking is simply skipped. */ |
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47 | |||
48 | void |
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49 | start_dependencies (char *filename) |
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50 | { |
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51 | dep_file = filename; |
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52 | } |
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53 | |||
54 | /* Noticed a new filename, so try to register it. */ |
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55 | |||
56 | void |
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57 | register_dependency (char *filename) |
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58 | { |
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59 | struct dependency *dep; |
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60 | |||
61 | if (dep_file == NULL) |
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62 | return; |
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63 | |||
64 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
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65 | { |
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66 | if (!filename_cmp (filename, dep->file)) |
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67 | return; |
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68 | } |
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69 | |||
70 | dep = (struct dependency *) xmalloc (sizeof (struct dependency)); |
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71 | dep->file = xstrdup (filename); |
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72 | dep->next = dep_chain; |
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73 | dep_chain = dep; |
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74 | } |
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75 | |||
76 | /* Quote a file name the way `make' wants it, and print it to FILE. |
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77 | If FILE is NULL, do no printing, but return the length of the |
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78 | quoted string. |
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79 | |||
80 | This code is taken from gcc with only minor changes. */ |
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81 | |||
82 | static int |
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83 | quote_string_for_make (FILE *file, char *src) |
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84 | { |
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85 | char *p = src; |
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86 | int i = 0; |
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87 | |||
88 | for (;;) |
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89 | { |
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90 | char c = *p++; |
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91 | |||
92 | switch (c) |
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93 | { |
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94 | case '\0': |
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95 | case ' ': |
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96 | case '\t': |
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97 | { |
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98 | /* GNU make uses a weird quoting scheme for white space. |
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99 | A space or tab preceded by 2N+1 backslashes represents |
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100 | N backslashes followed by space; a space or tab |
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101 | preceded by 2N backslashes represents N backslashes at |
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102 | the end of a file name; and backslashes in other |
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103 | contexts should not be doubled. */ |
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104 | char *q; |
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105 | |||
106 | for (q = p - 1; src < q && q[-1] == '\\'; q--) |
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107 | { |
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108 | if (file) |
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109 | putc ('\\', file); |
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110 | i++; |
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111 | } |
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112 | } |
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113 | if (!c) |
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114 | return i; |
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115 | if (file) |
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116 | putc ('\\', file); |
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117 | i++; |
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118 | goto ordinary_char; |
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119 | |||
120 | case '$': |
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121 | if (file) |
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122 | putc (c, file); |
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123 | i++; |
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124 | /* Fall through. This can mishandle things like "$(" but |
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125 | there's no easy fix. */ |
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126 | default: |
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127 | ordinary_char: |
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128 | /* This can mishandle characters in the string "\0\n%*?[\\~"; |
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129 | exactly which chars are mishandled depends on the `make' version. |
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130 | We know of no portable solution for this; |
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131 | even GNU make 3.76.1 doesn't solve the problem entirely. |
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132 | (Also, '\0' is mishandled due to our calling conventions.) */ |
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133 | if (file) |
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134 | putc (c, file); |
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135 | i++; |
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136 | break; |
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137 | } |
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138 | } |
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139 | } |
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140 | |||
141 | /* Append some output to the file, keeping track of columns and doing |
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142 | wrapping as necessary. */ |
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143 | |||
144 | static void |
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145 | wrap_output (FILE *f, char *string, int spacer) |
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146 | { |
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147 | int len = quote_string_for_make (NULL, string); |
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148 | |||
149 | if (len == 0) |
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150 | return; |
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151 | |||
152 | if (column |
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153 | && (MAX_COLUMNS |
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154 | - 1 /* spacer */ |
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155 | - 2 /* ` \' */ |
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156 | < column + len)) |
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157 | { |
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158 | fprintf (f, " \\\n "); |
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159 | column = 0; |
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160 | if (spacer == ' ') |
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161 | spacer = '\0'; |
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162 | } |
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163 | |||
164 | if (spacer == ' ') |
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165 | { |
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166 | putc (spacer, f); |
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167 | ++column; |
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168 | } |
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169 | |||
170 | quote_string_for_make (f, string); |
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171 | column += len; |
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172 | |||
173 | if (spacer == ':') |
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174 | { |
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175 | putc (spacer, f); |
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176 | ++column; |
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177 | } |
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178 | } |
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179 | |||
180 | /* Print dependency file. */ |
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181 | |||
182 | void |
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183 | print_dependencies (void) |
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184 | { |
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185 | FILE *f; |
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186 | struct dependency *dep; |
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187 | |||
188 | if (dep_file == NULL) |
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189 | return; |
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190 | |||
191 | f = fopen (dep_file, FOPEN_WT); |
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192 | if (f == NULL) |
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193 | { |
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194 | as_warn (_("can't open `%s' for writing"), dep_file); |
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195 | return; |
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196 | } |
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197 | |||
198 | column = 0; |
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199 | wrap_output (f, out_file_name, ':'); |
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200 | for (dep = dep_chain; dep != NULL; dep = dep->next) |
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201 | wrap_output (f, dep->file, ' '); |
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202 | |||
203 | putc ('\n', f); |
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204 | |||
205 | if (fclose (f)) |
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206 | as_warn (_("can't close `%s'"), dep_file); |
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207 | }>> |