commands.c

   1 /* Command processing for GNU Make.
   2 Copyright (C) 1988,89,91,92,93,94,95,96,97 Free Software Foundation, Inc.
   3 This file is part of GNU Make.
   4
   5 GNU Make is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Make is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU Make; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include "make.h"
  21 #include "dep.h"
  22 #include "filedef.h"
  23 #include "variable.h"
  24 #include "job.h"
  25 #include "commands.h"
  26
  27 #if VMS
  28 # define FILE_LIST_SEPARATOR ','
  29 #else
  30 # define FILE_LIST_SEPARATOR ' '
  31 #endif
  32
  33 extern int remote_kill PARAMS ((int id, int sig));
  34
  35 #ifndef HAVE_UNISTD_H
  36 extern int getpid ();
  37 #endif
  38 \f
  39 /* Set FILE's automatic variables up.  */
  40
  41 static void
  42 set_file_variables (struct file *file)
  43 {
  44   char *at, *percent, *star, *less;
  45
  46 #ifndef NO_ARCHIVES
  47   /* If the target is an archive member `lib(member)',
  48      then $@ is `lib' and $% is `member'.  */
  49
  50   if (ar_name (file->name))
  51     {
  52       unsigned int len;
  53       char *p;
  54
  55       p = strchr (file->name, '(');
  56       at = (char *) alloca (p - file->name + 1);
  57       bcopy (file->name, at, p - file->name);
  58       at[p - file->name] = '\0';
  59       len = strlen (p + 1);
  60       percent = (char *) alloca (len);
  61       bcopy (p + 1, percent, len - 1);
  62       percent[len - 1] = '\0';
  63     }
  64   else
  65 #endif  /* NO_ARCHIVES.  */
  66     {
  67       at = file->name;
  68       percent = "";
  69     }
  70
  71   /* $* is the stem from an implicit or static pattern rule.  */
  72   if (file->stem == 0)
  73     {
  74       /* In Unix make, $* is set to the target name with
  75          any suffix in the .SUFFIXES list stripped off for
  76          explicit rules.  We store this in the `stem' member.  */
  77       register struct dep *d;
  78       char *name;
  79       unsigned int len;
  80
  81 #ifndef NO_ARCHIVES
  82       if (ar_name (file->name))
  83         {
  84           name = strchr (file->name, '(') + 1;
  85           len = strlen (name) - 1;
  86         }
  87       else
  88 #endif
  89         {
  90           name = file->name;
  91           len = strlen (name);
  92         }
  93
  94       for (d = enter_file (".SUFFIXES")->deps; d != 0; d = d->next)
  95         {
  96           unsigned int slen = strlen (dep_name (d));
  97           if (len > slen && strneq (dep_name (d), name + (len - slen), slen))
  98             {
  99               file->stem = savestring (name, len - slen);
 100               break;
 101             }
 102         }
 103       if (d == 0)
 104         file->stem = "";
 105     }
 106   star = file->stem;
 107
 108   /* $< is the first dependency.  */
 109   less = file->deps != 0 ? dep_name (file->deps) : "";
 110
 111   if (file->cmds == default_file->cmds)
 112     /* This file got its commands from .DEFAULT.
 113        In this case $< is the same as $@.  */
 114     less = at;
 115
 116 #define DEFINE_VARIABLE(name, len, value) \
 117   (void) define_variable_for_file (name,len,value,o_automatic,0,file)
 118
 119   /* Define the variables.  */
 120
 121   DEFINE_VARIABLE ("<", 1, less);
 122   DEFINE_VARIABLE ("*", 1, star);
 123   DEFINE_VARIABLE ("@", 1, at);
 124   DEFINE_VARIABLE ("%", 1, percent);
 125
 126   /* Compute the values for $^, $+, $?, and $|.  */
 127
 128   {
 129     static char *plus_value=0, *bar_value=0, *qmark_value=0;
 130     static unsigned int qmark_max=0, plus_max=0, bar_max=0;
 131
 132     unsigned int qmark_len, plus_len, bar_len;
 133     char *cp;
 134     char *caret_value;
 135     char *qp;
 136     char *bp;
 137     struct dep *d;
 138     unsigned int len;
 139
 140     /* Compute first the value for $+, which is supposed to contain
 141        duplicate dependencies as they were listed in the makefile.  */
 142
 143     plus_len = 0;
 144     for (d = file->deps; d != 0; d = d->next)
 145       if (! d->ignore_mtime)
 146         plus_len += strlen (dep_name (d)) + 1;
 147     if (plus_len == 0)
 148       plus_len++;
 149
 150     if (plus_len > plus_max)
 151       plus_value = (char *) xmalloc (plus_max = plus_len);
 152     cp = plus_value;
 153
 154     qmark_len = plus_len + 1;   /* Will be this or less.  */
 155     for (d = file->deps; d != 0; d = d->next)
 156       if (! d->ignore_mtime)
 157         {
 158           char *c = dep_name (d);
 159
 160 #ifndef NO_ARCHIVES
 161           if (ar_name (c))
 162             {
 163               c = strchr (c, '(') + 1;
 164               len = strlen (c) - 1;
 165             }
 166           else
 167 #endif
 168             len = strlen (c);
 169
 170           bcopy (c, cp, len);
 171           cp += len;
 172           *cp++ = FILE_LIST_SEPARATOR;
 173           if (! d->changed)
 174             qmark_len -= len + 1;       /* Don't space in $? for this one.  */
 175         }
 176
 177     /* Kill the last space and define the variable.  */
 178
 179     cp[cp > plus_value ? -1 : 0] = '\0';
 180     DEFINE_VARIABLE ("+", 1, plus_value);
 181
 182     /* Make sure that no dependencies are repeated.  This does not
 183        really matter for the purpose of updating targets, but it
 184        might make some names be listed twice for $^ and $?.  */
 185
 186     uniquize_deps (file->deps);
 187
 188     bar_len = 0;
 189     for (d = file->deps; d != 0; d = d->next)
 190       if (d->ignore_mtime)
 191         bar_len += strlen (dep_name (d)) + 1;
 192     if (bar_len == 0)
 193       bar_len++;
 194
 195     /* Compute the values for $^, $?, and $|.  */
 196
 197     cp = caret_value = plus_value; /* Reuse the buffer; it's big enough.  */
 198
 199     if (qmark_len > qmark_max)
 200       qmark_value = (char *) xmalloc (qmark_max = qmark_len);
 201     qp = qmark_value;
 202
 203     if (bar_len > bar_max)
 204       bar_value = (char *) xmalloc (bar_max = bar_len);
 205     bp = bar_value;
 206
 207     for (d = file->deps; d != 0; d = d->next)
 208       {
 209         char *c = dep_name (d);
 210
 211 #ifndef NO_ARCHIVES
 212         if (ar_name (c))
 213           {
 214             c = strchr (c, '(') + 1;
 215             len = strlen (c) - 1;
 216           }
 217         else
 218 #endif
 219           len = strlen (c);
 220
 221         if (d->ignore_mtime)
 222           {
 223             bcopy (c, bp, len);
 224             bp += len;
 225             *bp++ = FILE_LIST_SEPARATOR;
 226           }
 227         else
 228           {
 229             bcopy (c, cp, len);
 230             cp += len;
 231             *cp++ = FILE_LIST_SEPARATOR;
 232             if (d->changed)
 233               {
 234                 bcopy (c, qp, len);
 235                 qp += len;
 236                 *qp++ = FILE_LIST_SEPARATOR;
 237               }
 238           }
 239       }
 240
 241     /* Kill the last spaces and define the variables.  */
 242
 243     cp[cp > caret_value ? -1 : 0] = '\0';
 244     DEFINE_VARIABLE ("^", 1, caret_value);
 245
 246     qp[qp > qmark_value ? -1 : 0] = '\0';
 247     DEFINE_VARIABLE ("?", 1, qmark_value);
 248
 249     bp[bp > bar_value ? -1 : 0] = '\0';
 250     DEFINE_VARIABLE ("|", 1, bar_value);
 251   }
 252
 253 #undef  DEFINE_VARIABLE
 254 }
 255 \f
 256 /* Chop CMDS up into individual command lines if necessary.
 257    Also set the `lines_flags' and `any_recurse' members.  */
 258
 259 void
 260 chop_commands (struct commands *cmds)
 261 {
 262   register char *p;
 263   unsigned int nlines, idx;
 264   char **lines;
 265
 266   /* If we don't have any commands,
 267      or we already parsed them, never mind.  */
 268
 269   if (!cmds || cmds->command_lines != 0)
 270     return;
 271
 272   /* Chop CMDS->commands up into lines in CMDS->command_lines.
 273          Also set the corresponding CMDS->lines_flags elements,
 274          and the CMDS->any_recurse flag.  */
 275
 276   nlines = 5;
 277   lines = (char **) xmalloc (5 * sizeof (char *));
 278   idx = 0;
 279   p = cmds->commands;
 280   while (*p != '\0')
 281     {
 282       char *end = p;
 283     find_end:;
 284       end = strchr (end, '\n');
 285       if (end == 0)
 286         end = p + strlen (p);
 287       else if (end > p && end[-1] == '\\')
 288         {
 289           int backslash = 1;
 290           register char *b;
 291           for (b = end - 2; b >= p && *b == '\\'; --b)
 292             backslash = !backslash;
 293           if (backslash)
 294             {
 295               ++end;
 296               goto find_end;
 297             }
 298         }
 299
 300       if (idx == nlines)
 301         {
 302           nlines += 2;
 303           lines = (char **) xrealloc ((char *) lines,
 304                                       nlines * sizeof (char *));
 305         }
 306       lines[idx++] = savestring (p, end - p);
 307       p = end;
 308       if (*p != '\0')
 309         ++p;
 310     }
 311
 312   if (idx != nlines)
 313     {
 314       nlines = idx;
 315       lines = (char **) xrealloc ((char *) lines,
 316                                   nlines * sizeof (char *));
 317     }
 318
 319   cmds->ncommand_lines = nlines;
 320   cmds->command_lines = lines;
 321
 322   cmds->any_recurse = 0;
 323   cmds->lines_flags = (char *) xmalloc (nlines);
 324   for (idx = 0; idx < nlines; ++idx)
 325     {
 326       int flags = 0;
 327
 328       for (p = lines[idx];
 329            isblank ((unsigned char)*p) || *p == '-' || *p == '@' || *p == '+';
 330            ++p)
 331         switch (*p)
 332           {
 333           case '+':
 334             flags |= COMMANDS_RECURSE;
 335             break;
 336           case '@':
 337             flags |= COMMANDS_SILENT;
 338             break;
 339           case '-':
 340             flags |= COMMANDS_NOERROR;
 341             break;
 342           }
 343       if (!(flags & COMMANDS_RECURSE))
 344         {
 345           unsigned int len = strlen (p);
 346           if (sindex (p, len, "$(MAKE)", 7) != 0
 347               || sindex (p, len, "${MAKE}", 7) != 0)
 348             flags |= COMMANDS_RECURSE;
 349         }
 350
 351       cmds->lines_flags[idx] = flags;
 352       cmds->any_recurse |= flags & COMMANDS_RECURSE;
 353     }
 354 }
 355 \f
 356 /* Execute the commands to remake FILE.  If they are currently executing,
 357    return or have already finished executing, just return.  Otherwise,
 358    fork off a child process to run the first command line in the sequence.  */
 359
 360 void
 361 execute_file_commands (struct file *file)
 362 {
 363   register char *p;
 364
 365   /* Don't go through all the preparations if
 366      the commands are nothing but whitespace.  */
 367
 368   for (p = file->cmds->commands; *p != '\0'; ++p)
 369     if (!isspace ((unsigned char)*p) && *p != '-' && *p != '@')
 370       break;
 371   if (*p == '\0')
 372     {
 373       /* If there are no commands, assume everything worked.  */
 374       set_command_state (file, cs_running);
 375       file->update_status = 0;
 376       notice_finished_file (file);
 377       return;
 378     }
 379
 380   /* First set the automatic variables according to this file.  */
 381
 382   initialize_file_variables (file, 0);
 383
 384   set_file_variables (file);
 385
 386   /* Start the commands running.  */
 387   new_job (file);
 388 }
 389 \f
 390 /* This is set while we are inside fatal_error_signal,
 391    so things can avoid nonreentrant operations.  */
 392
 393 int handling_fatal_signal = 0;
 394
 395 /* Handle fatal signals.  */
 396
 397 RETSIGTYPE
 398 fatal_error_signal (int sig)
 399 {
 400 #ifdef __MSDOS__
 401   extern int dos_status, dos_command_running;
 402
 403   if (dos_command_running)
 404     {
 405       /* That was the child who got the signal, not us.  */
 406       dos_status |= (sig << 8);
 407       return;
 408     }
 409   remove_intermediates (1);
 410   exit (EXIT_FAILURE);
 411 #else /* not __MSDOS__ */
 412 #ifdef _AMIGA
 413   remove_intermediates (1);
 414   if (sig == SIGINT)
 415      fputs (_("*** Break.\n"), stderr);
 416
 417   exit (10);
 418 #else /* not Amiga */
 419   handling_fatal_signal = 1;
 420
 421   /* Set the handling for this signal to the default.
 422      It is blocked now while we run this handler.  */
 423   signal (sig, SIG_DFL);
 424
 425   /* A termination signal won't be sent to the entire
 426      process group, but it means we want to kill the children.  */
 427
 428   if (sig == SIGTERM)
 429     {
 430       register struct child *c;
 431       for (c = children; c != 0; c = c->next)
 432         if (!c->remote)
 433           (void) kill (c->pid, SIGTERM);
 434     }
 435
 436   /* If we got a signal that means the user
 437      wanted to kill make, remove pending targets.  */
 438
 439   if (sig == SIGTERM || sig == SIGINT
 440 #ifdef SIGHUP
 441     || sig == SIGHUP
 442 #endif
 443 #ifdef SIGQUIT
 444     || sig == SIGQUIT
 445 #endif
 446     )
 447     {
 448       register struct child *c;
 449
 450       /* Remote children won't automatically get signals sent
 451          to the process group, so we must send them.  */
 452       for (c = children; c != 0; c = c->next)
 453         if (c->remote)
 454           (void) remote_kill (c->pid, sig);
 455
 456       for (c = children; c != 0; c = c->next)
 457         delete_child_targets (c);
 458
 459       /* Clean up the children.  We don't just use the call below because
 460          we don't want to print the "Waiting for children" message.  */
 461       while (job_slots_used > 0)
 462         reap_children (1, 0);
 463     }
 464   else
 465     /* Wait for our children to die.  */
 466     while (job_slots_used > 0)
 467       reap_children (1, 1);
 468
 469   /* Delete any non-precious intermediate files that were made.  */
 470
 471   remove_intermediates (1);
 472
 473 #ifdef SIGQUIT
 474   if (sig == SIGQUIT)
 475     /* We don't want to send ourselves SIGQUIT, because it will
 476        cause a core dump.  Just exit instead.  */
 477     exit (EXIT_FAILURE);
 478 #endif
 479
 480   /* Signal the same code; this time it will really be fatal.  The signal
 481      will be unblocked when we return and arrive then to kill us.  */
 482   if (kill (getpid (), sig) < 0)
 483     pfatal_with_name ("kill");
 484 #endif /* not Amiga */
 485 #endif /* not __MSDOS__  */
 486 }
 487 \f
 488 /* Delete FILE unless it's precious or not actually a file (phony),
 489    and it has changed on disk since we last stat'd it.  */
 490
 491 static void
 492 delete_target (struct file *file, char *on_behalf_of)
 493 {
 494   struct stat st;
 495   int e;
 496
 497   if (file->precious || file->phony)
 498     return;
 499
 500 #ifndef NO_ARCHIVES
 501   if (ar_name (file->name))
 502     {
 503       time_t file_date = (file->last_mtime == NONEXISTENT_MTIME
 504                           ? (time_t) -1
 505                           : (time_t) FILE_TIMESTAMP_S (file->last_mtime));
 506       if (ar_member_date (file->name) != file_date)
 507         {
 508           if (on_behalf_of)
 509             error (NILF, _("*** [%s] Archive member `%s' may be bogus; not deleted"),
 510                    on_behalf_of, file->name);
 511           else
 512             error (NILF, _("*** Archive member `%s' may be bogus; not deleted"),
 513                    file->name);
 514         }
 515       return;
 516     }
 517 #endif
 518
 519   EINTRLOOP (e, stat (file->name, &st));
 520   if (e == 0
 521       && S_ISREG (st.st_mode)
 522       && FILE_TIMESTAMP_STAT_MODTIME (file->name, st) != file->last_mtime)
 523     {
 524       if (on_behalf_of)
 525         error (NILF, _("*** [%s] Deleting file `%s'"), on_behalf_of, file->name);
 526       else
 527         error (NILF, _("*** Deleting file `%s'"), file->name);
 528       if (unlink (file->name) < 0
 529           && errno != ENOENT)   /* It disappeared; so what.  */
 530         perror_with_name ("unlink: ", file->name);
 531     }
 532 }
 533
 534
 535 /* Delete all non-precious targets of CHILD unless they were already deleted.
 536    Set the flag in CHILD to say they've been deleted.  */
 537
 538 void
 539 delete_child_targets (struct child *child)
 540 {
 541   struct dep *d;
 542
 543   if (child->deleted)
 544     return;
 545
 546   /* Delete the target file if it changed.  */
 547   delete_target (child->file, (char *) 0);
 548
 549   /* Also remove any non-precious targets listed in the `also_make' member.  */
 550   for (d = child->file->also_make; d != 0; d = d->next)
 551     delete_target (d->file, child->file->name);
 552
 553   child->deleted = 1;
 554 }
 555 \f
 556 /* Print out the commands in CMDS.  */
 557
 558 void
 559 print_commands (struct commands *cmds)
 560 {
 561   register char *s;
 562
 563   fputs (_("#  commands to execute"), stdout);
 564
 565   if (cmds->fileinfo.filenm == 0)
 566     puts (_(" (built-in):"));
 567   else
 568     printf (_(" (from `%s', line %lu):\n"),
 569             cmds->fileinfo.filenm, cmds->fileinfo.lineno);
 570
 571   s = cmds->commands;
 572   while (*s != '\0')
 573     {
 574       char *end;
 575
 576       while (isspace ((unsigned char)*s))
 577         ++s;
 578
 579       end = strchr (s, '\n');
 580       if (end == 0)
 581         end = s + strlen (s);
 582
 583       printf ("\t%.*s\n", (int) (end - s), s);
 584
 585       s = end;
 586     }
 587 }