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  1. /* depend.c - Handle dependency tracking.
  2.    Copyright (C) 1997-2015 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  6.    GAS is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 3, or (at your option)
  9.    any later version.
  10.  
  11.    GAS is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with GAS; see the file COPYING.  If not, write to the Free
  18.    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19.    02110-1301, USA.  */
  20.  
  21. #include "as.h"
  22. #include "filenames.h"
  23.  
  24. /* The file to write to, or NULL if no dependencies being kept.  */
  25. static char * dep_file = NULL;
  26.  
  27. struct dependency
  28.   {
  29.     char * file;
  30.     struct dependency * next;
  31.   };
  32.  
  33. /* All the files we depend on.  */
  34. static struct dependency * dep_chain = NULL;
  35.  
  36. /* Current column in output file.  */
  37. static int column = 0;
  38.  
  39. static int quote_string_for_make (FILE *, char *);
  40. static void wrap_output (FILE *, char *, int);
  41.  
  42. /* Number of columns allowable.  */
  43. #define MAX_COLUMNS 72
  45. /* Start saving dependencies, to be written to FILENAME.  If this is
  46.    never called, then dependency tracking is simply skipped.  */
  47.  
  48. void
  49. start_dependencies (char *filename)
  50. {
  51.   dep_file = filename;
  52. }
  53.  
  54. /* Noticed a new filename, so try to register it.  */
  55.  
  56. void
  57. register_dependency (char *filename)
  58. {
  59.   struct dependency *dep;
  60.  
  61.   if (dep_file == NULL)
  62.     return;
  63.  
  64.   for (dep = dep_chain; dep != NULL; dep = dep->next)
  65.     {
  66.       if (!filename_cmp (filename, dep->file))
  67.         return;
  68.     }
  69.  
  70.   dep = (struct dependency *) xmalloc (sizeof (struct dependency));
  71.   dep->file = xstrdup (filename);
  72.   dep->next = dep_chain;
  73.   dep_chain = dep;
  74. }
  75.  
  76. /* Quote a file name the way `make' wants it, and print it to FILE.
  77.    If FILE is NULL, do no printing, but return the length of the
  78.    quoted string.
  79.  
  80.    This code is taken from gcc with only minor changes.  */
  81.  
  82. static int
  83. quote_string_for_make (FILE *file, char *src)
  84. {
  85.   char *p = src;
  86.   int i = 0;
  87.  
  88.   for (;;)
  89.     {
  90.       char c = *p++;
  91.  
  92.       switch (c)
  93.         {
  94.         case '\0':
  95.         case ' ':
  96.         case '\t':
  97.           {
  98.             /* GNU make uses a weird quoting scheme for white space.
  99.                A space or tab preceded by 2N+1 backslashes represents
  100.                N backslashes followed by space; a space or tab
  101.                preceded by 2N backslashes represents N backslashes at
  102.                the end of a file name; and backslashes in other
  103.                contexts should not be doubled.  */
  104.             char *q;
  105.  
  106.             for (q = p - 1; src < q && q[-1] == '\\'; q--)
  107.               {
  108.                 if (file)
  109.                   putc ('\\', file);
  110.                 i++;
  111.               }
  112.           }
  113.           if (!c)
  114.             return i;
  115.           if (file)
  116.             putc ('\\', file);
  117.           i++;
  118.           goto ordinary_char;
  119.  
  120.         case '$':
  121.           if (file)
  122.             putc (c, file);
  123.           i++;
  124.           /* Fall through.  This can mishandle things like "$(" but
  125.              there's no easy fix.  */
  126.         default:
  127.         ordinary_char:
  128.           /* This can mishandle characters in the string "\0\n%*?[\\~";
  129.              exactly which chars are mishandled depends on the `make' version.
  130.              We know of no portable solution for this;
  131.              even GNU make 3.76.1 doesn't solve the problem entirely.
  132.              (Also, '\0' is mishandled due to our calling conventions.)  */
  133.           if (file)
  134.             putc (c, file);
  135.           i++;
  136.           break;
  137.         }
  138.     }
  139. }
  140.  
  141. /* Append some output to the file, keeping track of columns and doing
  142.    wrapping as necessary.  */
  143.  
  144. static void
  145. wrap_output (FILE *f, char *string, int spacer)
  146. {
  147.   int len = quote_string_for_make (NULL, string);
  148.  
  149.   if (len == 0)
  150.     return;
  151.  
  152.   if (column
  153.       && (MAX_COLUMNS
  154.           - 1 /* spacer */
  155.           - 2 /* ` \'   */
  156.           < column + len))
  157.     {
  158.       fprintf (f, " \\\n ");
  159.       column = 0;
  160.       if (spacer == ' ')
  161.         spacer = '\0';
  162.     }
  163.  
  164.   if (spacer == ' ')
  165.     {
  166.       putc (spacer, f);
  167.       ++column;
  168.     }
  169.  
  170.   quote_string_for_make (f, string);
  171.   column += len;
  172.  
  173.   if (spacer == ':')
  174.     {
  175.       putc (spacer, f);
  176.       ++column;
  177.     }
  178. }
  179.  
  180. /* Print dependency file.  */
  181.  
  182. void
  183. print_dependencies (void)
  184. {
  185.   FILE *f;
  186.   struct dependency *dep;
  187.  
  188.   if (dep_file == NULL)
  189.     return;
  190.  
  191.   f = fopen (dep_file, FOPEN_WT);
  192.   if (f == NULL)
  193.     {
  194.       as_warn (_("can't open `%s' for writing"), dep_file);
  195.       return;
  196.     }
  197.  
  198.   column = 0;
  199.   wrap_output (f, out_file_name, ':');
  200.   for (dep = dep_chain; dep != NULL; dep = dep->next)
  201.     wrap_output (f, dep->file, ' ');
  202.  
  203.   putc ('\n', f);
  204.  
  205.   if (fclose (f))
  206.     as_warn (_("can't close `%s'"), dep_file);
  207. }
  208.