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   struct dep *d;
  45   char *at, *percent, *star, *less;
  46
  47 #ifndef NO_ARCHIVES
  48   /* If the target is an archive member `lib(member)',
  49      then $@ is `lib' and $% is `member'.  */
  50
  51   if (ar_name (file->name))
  52     {
  53       unsigned int len;
  54       char *p;
  55
  56       p = strchr (file->name, '(');
  57       at = (char *) alloca (p - file->name + 1);
  58       bcopy (file->name, at, p - file->name);
  59       at[p - file->name] = '\0';
  60       len = strlen (p + 1);
  61       percent = (char *) alloca (len);
  62       bcopy (p + 1, percent, len - 1);
  63       percent[len - 1] = '\0';
  64     }
  65   else
  66 #endif  /* NO_ARCHIVES.  */
  67     {
  68       at = file->name;
  69       percent = "";
  70     }
  71
  72   /* $* is the stem from an implicit or static pattern rule.  */
  73   if (file->stem == 0)
  74     {
  75       /* In Unix make, $* is set to the target name with
  76          any suffix in the .SUFFIXES list stripped off for
  77          explicit rules.  We store this in the `stem' member.  */
  78       register struct dep *d;
  79       char *name;
  80       unsigned int len;
  81
  82 #ifndef NO_ARCHIVES
  83       if (ar_name (file->name))
  84         {
  85           name = strchr (file->name, '(') + 1;
  86           len = strlen (name) - 1;
  87         }
  88       else
  89 #endif
  90         {
  91           name = file->name;
  92           len = strlen (name);
  93         }
  94
  95       for (d = enter_file (".SUFFIXES")->deps; d != 0; d = d->next)
  96         {
  97           unsigned int slen = strlen (dep_name (d));
  98           if (len > slen && strneq (dep_name (d), name + (len - slen), slen))
  99             {
 100               file->stem = savestring (name, len - slen);
 101               break;
 102             }
 103         }
 104       if (d == 0)
 105         file->stem = "";
 106     }
 107   star = file->stem;
 108
 109   /* $< is the first not order-only dependency.  */
 110   less = "";
 111   for (d = file->deps; d != 0; d = d->next)
 112     if (!d->ignore_mtime)
 113       {
 114         less = dep_name (d);
 115         break;
 116       }
 117
 118   if (file->cmds == default_file->cmds)
 119     /* This file got its commands from .DEFAULT.
 120        In this case $< is the same as $@.  */
 121     less = at;
 122
 123 #define DEFINE_VARIABLE(name, len, value) \
 124   (void) define_variable_for_file (name,len,value,o_automatic,0,file)
 125
 126   /* Define the variables.  */
 127
 128   DEFINE_VARIABLE ("<", 1, less);
 129   DEFINE_VARIABLE ("*", 1, star);
 130   DEFINE_VARIABLE ("@", 1, at);
 131   DEFINE_VARIABLE ("%", 1, percent);
 132
 133   /* Compute the values for $^, $+, $?, and $|.  */
 134
 135   {
 136     static char *plus_value=0, *bar_value=0, *qmark_value=0;
 137     static unsigned int qmark_max=0, plus_max=0, bar_max=0;
 138
 139     unsigned int qmark_len, plus_len, bar_len;
 140     char *cp;
 141     char *caret_value;
 142     char *qp;
 143     char *bp;
 144     unsigned int len;
 145
 146     /* Compute first the value for $+, which is supposed to contain
 147        duplicate dependencies as they were listed in the makefile.  */
 148
 149     plus_len = 0;
 150     for (d = file->deps; d != 0; d = d->next)
 151       if (! d->ignore_mtime)
 152         plus_len += strlen (dep_name (d)) + 1;
 153     if (plus_len == 0)
 154       plus_len++;
 155
 156     if (plus_len > plus_max)
 157       plus_value = (char *) xmalloc (plus_max = plus_len);
 158     cp = plus_value;
 159
 160     qmark_len = plus_len + 1;   /* Will be this or less.  */
 161     for (d = file->deps; d != 0; d = d->next)
 162       if (! d->ignore_mtime)
 163         {
 164           char *c = dep_name (d);
 165
 166 #ifndef NO_ARCHIVES
 167           if (ar_name (c))
 168             {
 169               c = strchr (c, '(') + 1;
 170               len = strlen (c) - 1;
 171             }
 172           else
 173 #endif
 174             len = strlen (c);
 175
 176           bcopy (c, cp, len);
 177           cp += len;
 178           *cp++ = FILE_LIST_SEPARATOR;
 179           if (! d->changed)
 180             qmark_len -= len + 1;       /* Don't space in $? for this one.  */
 181         }
 182
 183     /* Kill the last space and define the variable.  */
 184
 185     cp[cp > plus_value ? -1 : 0] = '\0';
 186     DEFINE_VARIABLE ("+", 1, plus_value);
 187
 188     /* Make sure that no dependencies are repeated.  This does not
 189        really matter for the purpose of updating targets, but it
 190        might make some names be listed twice for $^ and $?.  */
 191
 192     uniquize_deps (file->deps);
 193
 194     bar_len = 0;
 195     for (d = file->deps; d != 0; d = d->next)
 196       if (d->ignore_mtime)
 197         bar_len += strlen (dep_name (d)) + 1;
 198     if (bar_len == 0)
 199       bar_len++;
 200
 201     /* Compute the values for $^, $?, and $|.  */
 202
 203     cp = caret_value = plus_value; /* Reuse the buffer; it's big enough.  */
 204
 205     if (qmark_len > qmark_max)
 206       qmark_value = (char *) xmalloc (qmark_max = qmark_len);
 207     qp = qmark_value;
 208
 209     if (bar_len > bar_max)
 210       bar_value = (char *) xmalloc (bar_max = bar_len);
 211     bp = bar_value;
 212
 213     for (d = file->deps; d != 0; d = d->next)
 214       {
 215         char *c = dep_name (d);
 216
 217 #ifndef NO_ARCHIVES
 218         if (ar_name (c))
 219           {
 220             c = strchr (c, '(') + 1;
 221             len = strlen (c) - 1;
 222           }
 223         else
 224 #endif
 225           len = strlen (c);
 226
 227         if (d->ignore_mtime)
 228           {
 229             bcopy (c, bp, len);
 230             bp += len;
 231             *bp++ = FILE_LIST_SEPARATOR;
 232           }
 233         else
 234           {
 235             bcopy (c, cp, len);
 236             cp += len;
 237             *cp++ = FILE_LIST_SEPARATOR;
 238             if (d->changed)
 239               {
 240                 bcopy (c, qp, len);
 241                 qp += len;
 242                 *qp++ = FILE_LIST_SEPARATOR;
 243               }
 244           }
 245       }
 246
 247     /* Kill the last spaces and define the variables.  */
 248
 249     cp[cp > caret_value ? -1 : 0] = '\0';
 250     DEFINE_VARIABLE ("^", 1, caret_value);
 251
 252     qp[qp > qmark_value ? -1 : 0] = '\0';
 253     DEFINE_VARIABLE ("?", 1, qmark_value);
 254
 255     bp[bp > bar_value ? -1 : 0] = '\0';
 256     DEFINE_VARIABLE ("|", 1, bar_value);
 257   }
 258
 259 #undef  DEFINE_VARIABLE
 260 }
 261 \f
 262 /* Chop CMDS up into individual command lines if necessary.
 263    Also set the `lines_flags' and `any_recurse' members.  */
 264
 265 void
 266 chop_commands (struct commands *cmds)
 267 {
 268   register char *p;
 269   unsigned int nlines, idx;
 270   char **lines;
 271
 272   /* If we don't have any commands,
 273      or we already parsed them, never mind.  */
 274
 275   if (!cmds || cmds->command_lines != 0)
 276     return;
 277
 278   /* Chop CMDS->commands up into lines in CMDS->command_lines.
 279          Also set the corresponding CMDS->lines_flags elements,
 280          and the CMDS->any_recurse flag.  */
 281
 282   nlines = 5;
 283   lines = (char **) xmalloc (5 * sizeof (char *));
 284   idx = 0;
 285   p = cmds->commands;
 286   while (*p != '\0')
 287     {
 288       char *end = p;
 289     find_end:;
 290       end = strchr (end, '\n');
 291       if (end == 0)
 292         end = p + strlen (p);
 293       else if (end > p && end[-1] == '\\')
 294         {
 295           int backslash = 1;
 296           register char *b;
 297           for (b = end - 2; b >= p && *b == '\\'; --b)
 298             backslash = !backslash;
 299           if (backslash)
 300             {
 301               ++end;
 302               goto find_end;
 303             }
 304         }
 305
 306       if (idx == nlines)
 307         {
 308           nlines += 2;
 309           lines = (char **) xrealloc ((char *) lines,
 310                                       nlines * sizeof (char *));
 311         }
 312       lines[idx++] = savestring (p, end - p);
 313       p = end;
 314       if (*p != '\0')
 315         ++p;
 316     }
 317
 318   if (idx != nlines)
 319     {
 320       nlines = idx;
 321       lines = (char **) xrealloc ((char *) lines,
 322                                   nlines * sizeof (char *));
 323     }
 324
 325   cmds->ncommand_lines = nlines;
 326   cmds->command_lines = lines;
 327
 328   cmds->any_recurse = 0;
 329   cmds->lines_flags = (char *) xmalloc (nlines);
 330   for (idx = 0; idx < nlines; ++idx)
 331     {
 332       int flags = 0;
 333
 334       for (p = lines[idx];
 335            isblank ((unsigned char)*p) || *p == '-' || *p == '@' || *p == '+';
 336            ++p)
 337         switch (*p)
 338           {
 339           case '+':
 340             flags |= COMMANDS_RECURSE;
 341             break;
 342           case '@':
 343             flags |= COMMANDS_SILENT;
 344             break;
 345           case '-':
 346             flags |= COMMANDS_NOERROR;
 347             break;
 348           }
 349       if (!(flags & COMMANDS_RECURSE))
 350         {
 351           unsigned int len = strlen (p);
 352           if (sindex (p, len, "$(MAKE)", 7) != 0
 353               || sindex (p, len, "${MAKE}", 7) != 0)
 354             flags |= COMMANDS_RECURSE;
 355         }
 356
 357       cmds->lines_flags[idx] = flags;
 358       cmds->any_recurse |= flags & COMMANDS_RECURSE;
 359     }
 360 }
 361 \f
 362 /* Execute the commands to remake FILE.  If they are currently executing,
 363    return or have already finished executing, just return.  Otherwise,
 364    fork off a child process to run the first command line in the sequence.  */
 365
 366 void
 367 execute_file_commands (struct file *file)
 368 {
 369   register char *p;
 370
 371   /* Don't go through all the preparations if
 372      the commands are nothing but whitespace.  */
 373
 374   for (p = file->cmds->commands; *p != '\0'; ++p)
 375     if (!isspace ((unsigned char)*p) && *p != '-' && *p != '@')
 376       break;
 377   if (*p == '\0')
 378     {
 379       /* If there are no commands, assume everything worked.  */
 380       set_command_state (file, cs_running);
 381       file->update_status = 0;
 382       notice_finished_file (file);
 383       return;
 384     }
 385
 386   /* First set the automatic variables according to this file.  */
 387
 388   initialize_file_variables (file, 0);
 389
 390   set_file_variables (file);
 391
 392   /* Start the commands running.  */
 393   new_job (file);
 394 }
 395 \f
 396 /* This is set while we are inside fatal_error_signal,
 397    so things can avoid nonreentrant operations.  */
 398
 399 int handling_fatal_signal = 0;
 400
 401 /* Handle fatal signals.  */
 402
 403 RETSIGTYPE
 404 fatal_error_signal (int sig)
 405 {
 406 #ifdef __MSDOS__
 407   extern int dos_status, dos_command_running;
 408
 409   if (dos_command_running)
 410     {
 411       /* That was the child who got the signal, not us.  */
 412       dos_status |= (sig << 8);
 413       return;
 414     }
 415   remove_intermediates (1);
 416   exit (EXIT_FAILURE);
 417 #else /* not __MSDOS__ */
 418 #ifdef _AMIGA
 419   remove_intermediates (1);
 420   if (sig == SIGINT)
 421      fputs (_("*** Break.\n"), stderr);
 422
 423   exit (10);
 424 #else /* not Amiga */
 425   handling_fatal_signal = 1;
 426
 427   /* Set the handling for this signal to the default.
 428      It is blocked now while we run this handler.  */
 429   signal (sig, SIG_DFL);
 430
 431   /* A termination signal won't be sent to the entire
 432      process group, but it means we want to kill the children.  */
 433
 434   if (sig == SIGTERM)
 435     {
 436       register struct child *c;
 437       for (c = children; c != 0; c = c->next)
 438         if (!c->remote)
 439           (void) kill (c->pid, SIGTERM);
 440     }
 441
 442   /* If we got a signal that means the user
 443      wanted to kill make, remove pending targets.  */
 444
 445   if (sig == SIGTERM || sig == SIGINT
 446 #ifdef SIGHUP
 447     || sig == SIGHUP
 448 #endif
 449 #ifdef SIGQUIT
 450     || sig == SIGQUIT
 451 #endif
 452     )
 453     {
 454       register struct child *c;
 455
 456       /* Remote children won't automatically get signals sent
 457          to the process group, so we must send them.  */
 458       for (c = children; c != 0; c = c->next)
 459         if (c->remote)
 460           (void) remote_kill (c->pid, sig);
 461
 462       for (c = children; c != 0; c = c->next)
 463         delete_child_targets (c);
 464
 465       /* Clean up the children.  We don't just use the call below because
 466          we don't want to print the "Waiting for children" message.  */
 467       while (job_slots_used > 0)
 468         reap_children (1, 0);
 469     }
 470   else
 471     /* Wait for our children to die.  */
 472     while (job_slots_used > 0)
 473       reap_children (1, 1);
 474
 475   /* Delete any non-precious intermediate files that were made.  */
 476
 477   remove_intermediates (1);
 478
 479 #ifdef SIGQUIT
 480   if (sig == SIGQUIT)
 481     /* We don't want to send ourselves SIGQUIT, because it will
 482        cause a core dump.  Just exit instead.  */
 483     exit (EXIT_FAILURE);
 484 #endif
 485
 486   /* Signal the same code; this time it will really be fatal.  The signal
 487      will be unblocked when we return and arrive then to kill us.  */
 488   if (kill (getpid (), sig) < 0)
 489     pfatal_with_name ("kill");
 490 #endif /* not Amiga */
 491 #endif /* not __MSDOS__  */
 492 }
 493 \f
 494 /* Delete FILE unless it's precious or not actually a file (phony),
 495    and it has changed on disk since we last stat'd it.  */
 496
 497 static void
 498 delete_target (struct file *file, char *on_behalf_of)
 499 {
 500   struct stat st;
 501   int e;
 502
 503   if (file->precious || file->phony)
 504     return;
 505
 506 #ifndef NO_ARCHIVES
 507   if (ar_name (file->name))
 508     {
 509       time_t file_date = (file->last_mtime == NONEXISTENT_MTIME
 510                           ? (time_t) -1
 511                           : (time_t) FILE_TIMESTAMP_S (file->last_mtime));
 512       if (ar_member_date (file->name) != file_date)
 513         {
 514           if (on_behalf_of)
 515             error (NILF, _("*** [%s] Archive member `%s' may be bogus; not deleted"),
 516                    on_behalf_of, file->name);
 517           else
 518             error (NILF, _("*** Archive member `%s' may be bogus; not deleted"),
 519                    file->name);
 520         }
 521       return;
 522     }
 523 #endif
 524
 525   EINTRLOOP (e, stat (file->name, &st));
 526   if (e == 0
 527       && S_ISREG (st.st_mode)
 528       && FILE_TIMESTAMP_STAT_MODTIME (file->name, st) != file->last_mtime)
 529     {
 530       if (on_behalf_of)
 531         error (NILF, _("*** [%s] Deleting file `%s'"), on_behalf_of, file->name);
 532       else
 533         error (NILF, _("*** Deleting file `%s'"), file->name);
 534       if (unlink (file->name) < 0
 535           && errno != ENOENT)   /* It disappeared; so what.  */
 536         perror_with_name ("unlink: ", file->name);
 537     }
 538 }
 539
 540
 541 /* Delete all non-precious targets of CHILD unless they were already deleted.
 542    Set the flag in CHILD to say they've been deleted.  */
 543
 544 void
 545 delete_child_targets (struct child *child)
 546 {
 547   struct dep *d;
 548
 549   if (child->deleted)
 550     return;
 551
 552   /* Delete the target file if it changed.  */
 553   delete_target (child->file, (char *) 0);
 554
 555   /* Also remove any non-precious targets listed in the `also_make' member.  */
 556   for (d = child->file->also_make; d != 0; d = d->next)
 557     delete_target (d->file, child->file->name);
 558
 559   child->deleted = 1;
 560 }
 561 \f
 562 /* Print out the commands in CMDS.  */
 563
 564 void
 565 print_commands (struct commands *cmds)
 566 {
 567   register char *s;
 568
 569   fputs (_("#  commands to execute"), stdout);
 570
 571   if (cmds->fileinfo.filenm == 0)
 572     puts (_(" (built-in):"));
 573   else
 574     printf (_(" (from `%s', line %lu):\n"),
 575             cmds->fileinfo.filenm, cmds->fileinfo.lineno);
 576
 577   s = cmds->commands;
 578   while (*s != '\0')
 579     {
 580       char *end;
 581
 582       while (isspace ((unsigned char)*s))
 583         ++s;
 584
 585       end = strchr (s, '\n');
 586       if (end == 0)
 587         end = s + strlen (s);
 588
 589       printf ("\t%.*s\n", (int) (end - s), s);
 590
 591       s = end;
 592     }
 593 }