make.c

   1 /*
   2  * Copyright 1993, 1995 Christopher Seiwald.
   3  *
   4  * This file is part of Jam - see jam.c for Copyright information.
   5  */
   6
   7 /*
   8  * make.c - bring a target up to date, once rules are in place
   9  *
  10  * This modules controls the execution of rules to bring a target and
  11  * its dependencies up to date.  It is invoked after the targets, rules,
  12  * et. al. described in rules.h are created by the interpreting of the
  13  * jam files.
  14  *
  15  * This file contains the main make() entry point and the first pass
  16  * make0().  The second pass, make1(), which actually does the command
  17  * execution, is in make1.c.
  18  *
  19  * External routines:
  20  *  make() - make a target, given its name
  21  *
  22  * Internal routines:
  23  *  make0() - bind and scan everything to make a TARGET
  24  *  make0sort() - reorder TARGETS chain by their time (newest to oldest)
  25  *
  26  * 12/26/93 (seiwald) - allow NOTIME targets to be expanded via $(<), $(>)
  27  * 01/04/94 (seiwald) - print all targets, bounded, when tracing commands
  28  * 04/08/94 (seiwald) - progress report now reflects only targets with actions
  29  * 04/11/94 (seiwald) - Combined deps & headers into deps[2] in TARGET.
  30  * 12/20/94 (seiwald) - NOTIME renamed NOTFILE.
  31  * 12/20/94 (seiwald) - make0() headers after determining fate of target, so
  32  *      that headers aren't seen as dependents on themselves.
  33  * 01/19/95 (seiwald) - distinguish between CANTFIND/CANTMAKE targets.
  34  * 02/02/95 (seiwald) - propagate leaf source time for new LEAVES rule.
  35  * 02/14/95 (seiwald) - NOUPDATE rule means don't update existing target.
  36  * 08/22/95 (seiwald) - NOUPDATE targets immune to anyhow (-a) flag.
  37  * 09/06/00 (seiwald) - NOCARE affects targets with sources/actions.
  38  * 03/02/01 (seiwald) - reverse NOCARE change.
  39  * 03/14/02 (seiwald) - TEMPORARY targets no longer take on parents age
  40  * 03/16/02 (seiwald) - support for -g (reorder builds by source time)
  41  * 07/17/02 (seiwald) - TEMPORARY sources for headers now get built
  42  * 09/19/02 (seiwald) - new -d displays
  43  * 09/23/02 (seiwald) - suppress "...using temp..." in default output
  44  * 09/28/02 (seiwald) - make0() takes parent pointer; new -dc display
  45  * 11/04/02 (seiwald) - const-ing for string literals
  46  * 12/03/02 (seiwald) - fix odd includes support by grafting them onto depends
  47  * 12/17/02 (seiwald) - new copysettings() to protect target-specific vars
  48  * 01/03/03 (seiwald) - T_FATE_NEWER once again gets set with missing parent
  49  * 01/14/03 (seiwald) - fix includes fix with new internal includes TARGET
  50  * 04/04/03 (seiwald) - fix INTERNAL node binding to avoid T_BIND_PARENTS
  51  * 04/14/06 (kaib)    - fix targets to show in 'updated' when their includes
  52  *                      are newer
  53  */
  54
  55 # include "jam.h"
  56
  57 # include "lists.h"
  58 # include "parse.h"
  59 # include "variable.h"
  60 # include "rules.h"
  61
  62 # include "search.h"
  63 # include "newstr.h"
  64 # include "make.h"
  65 # include "headers.h"
  66 # include "command.h"
  67
  68 # ifndef max
  69 # define max(a,b) ((a)>(b)?(a):(b))
  70 # endif
  71
  72 typedef struct {
  73   int temp;
  74   int updating;
  75   int cantfind;
  76   int cantmake;
  77   int targets;
  78   int made;
  79 } COUNTS;
  80
  81
  82 static void make0 (TARGET *t, TARGET *p, int depth, COUNTS *counts, int anyhow);
  83
  84
  85 static TARGETS *make0sort (TARGETS *c);
  86
  87
  88 static const char *target_fate[] = {
  89   "init",   /* T_FATE_INIT */
  90   "making",   /* T_FATE_MAKING */
  91   "stable",   /* T_FATE_STABLE */
  92   "newer",  /* T_FATE_NEWER */
  93   "temp",   /* T_FATE_ISTMP */
  94   "touched",  /* T_FATE_TOUCHED */
  95   "missing",  /* T_FATE_MISSING */
  96   "needtmp",  /* T_FATE_NEEDTMP */
  97   "old",    /* T_FATE_OUTDATED */
  98   "update",   /* T_FATE_UPDATE */
  99   "nofind",   /* T_FATE_CANTFIND */
 100   "nomake"  /* T_FATE_CANTMAKE */
 101 };
 102
 103
 104 static const char *target_bind[] = {
 105   "unbound",
 106   "missing",
 107   "parents",
 108   "exists",
 109 };
 110
 111 # define spaces(x) ("                " + 16 - (x > 16 ? 16 : x))
 112
 113
 114 /*
 115  * make() - make a target, given its name
 116  */
 117 int make (int n_targets, const char **targets, int anyhow) {
 118   int i;
 119   COUNTS counts[1];
 120   int status = 0; /* 1 if anything fails */
 121
 122   memset((char *)counts, 0, sizeof(*counts));
 123   for (i = 0; i < n_targets; i++) {
 124     TARGET *t = bindtarget(targets[i]);
 125     make0(t, 0, 0, counts, anyhow);
 126   }
 127   if (DEBUG_MAKE) {
 128     if (counts->targets) printf("...found %d target(s)...\n", counts->targets);
 129     if (counts->temp) printf("...using %d temp target(s)...\n", counts->temp);
 130     if (counts->updating) printf("...updating %d target(s)...\n", counts->updating);
 131     if (counts->cantfind) printf("...can't find %d target(s)...\n", counts->cantfind);
 132     if (counts->cantmake) printf("...can't make %d target(s)...\n", counts->cantmake);
 133   }
 134   status = counts->cantfind || counts->cantmake;
 135   for (i = 0; i < n_targets; i++) status |= make1(bindtarget(targets[i]));
 136   return status;
 137 }
 138
 139
 140 /*
 141  * make0() - bind and scan everything to make a TARGET
 142  *
 143  * Make0() recursively binds a target, searches for #included headers,
 144  * calls itself on those headers, and calls itself on any dependents.
 145  */
 146 static void make0 (
 147   TARGET *t,
 148   TARGET *p, /* parent */
 149   int depth, /* for display purposes */
 150   COUNTS  *counts, /* for reporting */
 151   int anyhow /* forcibly touch all (real) targets */
 152 ) {
 153   TARGETS *c, *incs;
 154   TARGET *ptime = t;
 155   time_t last, leaf, hlast;
 156   int fate;
 157   const char *flag = "";
 158   SETTINGS *s;
 159
 160   /*
 161    * Step 1: initialize
 162    */
 163   if (DEBUG_MAKEPROG) printf("make\t--\t%s%s\n", spaces(depth), t->name);
 164   t->fate = T_FATE_MAKING;
 165
 166   /*
 167    * Step 2: under the influence of "on target" variables,
 168    * bind the target and search for headers.
 169    */
 170   /* Step 2a: set "on target" variables. */
 171   s = copysettings(t->settings);
 172   pushsettings(s);
 173   /* Step 2b: find and timestamp the target file (if it's a file). */
 174   if (t->binding == T_BIND_UNBOUND && !(t->flags & T_FLAG_NOTFILE)) {
 175     t->boundname = search(t->name, &t->time);
 176     t->binding = t->time ? T_BIND_EXISTS : T_BIND_MISSING;
 177   }
 178   /* INTERNAL, NOTFILE header nodes have the time of their parents */
 179   if (p && t->flags & T_FLAG_INTERNAL) ptime = p;
 180   /* If temp file doesn't exist but parent does, use parent */
 181   if (p && t->flags & T_FLAG_TEMP && t->binding == T_BIND_MISSING && p->binding != T_BIND_MISSING) {
 182     t->binding = T_BIND_PARENTS;
 183     ptime = p;
 184   }
 185   /* Step 2c: If its a file, search for headers. */
 186   if (t->binding == T_BIND_EXISTS) headers(t);
 187   /* Step 2d: reset "on target" variables */
 188   popsettings(s);
 189   freesettings(s);
 190
 191   /*
 192    * Pause for a little progress reporting
 193    */
 194   if (DEBUG_MAKEPROG) {
 195     if (strcmp(t->name, t->boundname)) {
 196       printf("bind\t--\t%s%s: %s\n", spaces(depth), t->name, t->boundname);
 197     }
 198     switch (t->binding) {
 199       case T_BIND_UNBOUND: case T_BIND_MISSING: case T_BIND_PARENTS:
 200         printf("time\t--\t%s%s: %s\n", spaces(depth), t->name, target_bind[ (int)t->binding ]);
 201         break;
 202       case T_BIND_EXISTS:
 203         printf("time\t--\t%s%s: %s", spaces(depth), t->name, ctime(&t->time));
 204         break;
 205     }
 206   }
 207
 208   /*
 209    * Step 3: recursively make0() dependents & headers
 210    */
 211   /* Step 3a: recursively make0() dependents */
 212   for (c = t->depends; c; c = c->next) {
 213     int internal = t->flags & T_FLAG_INTERNAL;
 214
 215     if (DEBUG_DEPENDS)
 216       printf("%s \"%s\" : \"%s\" ;\n",
 217         internal ? "Includes" : "Depends",
 218         t->name, c->target->name);
 219
 220     /* Warn about circular deps, except for includes, */
 221     /* which include each other alot. */
 222     if (c->target->fate == T_FATE_INIT) make0(c->target, ptime, depth+1, counts, anyhow);
 223     else if (c->target->fate == T_FATE_MAKING && !internal) printf("warning: %s depends on itself\n", c->target->name);
 224   }
 225   /* Step 3b: recursively make0() internal includes node */
 226   if (t->includes) make0(t->includes, p, depth+1, counts, anyhow);
 227   /* Step 3c: add dependents' includes to our direct dependencies */
 228   incs = 0;
 229   for (c = t->depends; c; c = c->next) {
 230     if (c->target->includes) {
 231       incs = targetentry(incs, c->target->includes);
 232       /* If the includes are newer than we are their original target
 233          also needs to be marked newer. This is needed so that 'updated'
 234          correctly will include the original target in the $(<) variable. */
 235       if (c->target->includes->time > t->time) c->target->fate = max(T_FATE_NEWER, c->target->fate);
 236     }
 237   }
 238
 239   t->depends = targetchain(t->depends, incs);
 240
 241   /*
 242    * Step 4: compute time & fate
 243    */
 244   /* Step 4a: pick up dependents' time and fate */
 245   last = 0;
 246   leaf = 0;
 247   fate = T_FATE_STABLE;
 248   for (c = t->depends; c; c = c->next) {
 249     /* If LEAVES has been applied, we only heed the timestamps of */
 250     /* the leaf source nodes. */
 251     leaf = max(leaf, c->target->leaf);
 252     if (t->flags & T_FLAG_LEAVES) {
 253       last = leaf;
 254       continue;
 255     }
 256     last = max(last, c->target->time);
 257     fate = max(fate, c->target->fate);
 258   }
 259
 260   /* Step 4b: pick up included headers time */
 261   /*
 262    * If a header is newer than a temp source that includes it,
 263    * the temp source will need building.
 264    */
 265   hlast = t->includes ? t->includes->time : 0;
 266   /* Step 4c: handle NOUPDATE oddity */
 267   /*
 268    * If a NOUPDATE file exists, make dependents eternally old.
 269    * Don't inherit our fate from our dependents.  Decide fate
 270    * based only upon other flags and our binding (done later).
 271    */
 272   if (t->flags & T_FLAG_NOUPDATE) {
 273     last = 0;
 274     t->time = 0;
 275     fate = T_FATE_STABLE;
 276   }
 277   /* Step 4d: determine fate: rebuild target or what? */
 278   /*
 279     In English:
 280     If can't find or make child, can't make target.
 281     If children changed, make target.
 282     If target missing, make it.
 283     If children newer, make target.
 284     If temp's children newer than parent, make temp.
 285     If temp's headers newer than parent, make temp.
 286     If deliberately touched, make it.
 287     If up-to-date temp file present, use it.
 288     If target newer than non-notfile parent, mark target newer.
 289     Otherwise, stable!
 290
 291     Note this block runs from least to most stable:
 292     as we make it further down the list, the target's
 293     fate is getting stabler.
 294   */
 295   if (fate >= T_FATE_BROKEN) {
 296     fate = T_FATE_CANTMAKE;
 297   } else if (fate >= T_FATE_SPOIL) {
 298     fate = T_FATE_UPDATE;
 299   } else if (t->binding == T_BIND_MISSING) {
 300     fate = T_FATE_MISSING;
 301   } else if (t->binding == T_BIND_EXISTS && last > t->time) {
 302     fate = T_FATE_OUTDATED;
 303   } else if (t->binding == T_BIND_PARENTS && last > p->time) {
 304     fate = T_FATE_NEEDTMP;
 305   } else if (t->binding == T_BIND_PARENTS && hlast > p->time) {
 306     fate = T_FATE_NEEDTMP;
 307   } else if (t->flags & T_FLAG_TOUCHED) {
 308     fate = T_FATE_TOUCHED;
 309   } else if (anyhow && !(t->flags & T_FLAG_NOUPDATE)) {
 310     fate = T_FATE_TOUCHED;
 311   } else if (t->binding == T_BIND_EXISTS && t->flags & T_FLAG_TEMP) {
 312     fate = T_FATE_ISTMP;
 313   } else if (t->binding == T_BIND_EXISTS && p && p->binding != T_BIND_UNBOUND && t->time > p->time) {
 314     fate = T_FATE_NEWER;
 315   } else {
 316     fate = T_FATE_STABLE;
 317   }
 318   /* Step 4e: handle missing files */
 319   /* If it's missing and there are no actions to create it, boom. */
 320   /* If we can't make a target we don't care about, 'sokay */
 321   /* We could insist that there are updating actions for all missing */
 322   /* files, but if they have dependents we just pretend it's NOTFILE. */
 323   if (fate == T_FATE_MISSING && !t->actions && !t->depends) {
 324     if (t->flags & T_FLAG_NOCARE) {
 325       fate = T_FATE_STABLE;
 326     } else {
 327       printf("don't know how to make %s\n", t->name);
 328       fate = T_FATE_CANTFIND;
 329     }
 330   }
 331   /* Step 4f: propagate dependents' time & fate. */
 332   /* Set leaf time to be our time only if this is a leaf. */
 333   t->time = max(t->time, last);
 334   t->leaf = leaf ? leaf : t->time ;
 335   t->fate = fate;
 336
 337   /*
 338    * Step 5: sort dependents by their update time.
 339    */
 340   if (globs.newestfirst) t->depends = make0sort(t->depends);
 341
 342   /*
 343    * Step 6: a little harmless tabulating for tracing purposes
 344    */
 345   /* Don't count or report interal includes nodes. */
 346   if (t->flags & T_FLAG_INTERNAL) return;
 347   if (!(++counts->targets % 1000) && DEBUG_MAKE) printf("...patience...\n");
 348
 349   if (fate == T_FATE_ISTMP) counts->temp++;
 350   else if (fate == T_FATE_CANTFIND) counts->cantfind++;
 351   else if (fate == T_FATE_CANTMAKE && t->actions) counts->cantmake++;
 352   else if (fate >= T_FATE_BUILD && fate < T_FATE_BROKEN && t->actions) counts->updating++;
 353
 354   if (!(t->flags & T_FLAG_NOTFILE) && fate >= T_FATE_SPOIL) flag = "+";
 355   else if (t->binding == T_BIND_EXISTS && p && t->time > p->time) flag = "*";
 356
 357   if (DEBUG_MAKEPROG)
 358     printf("made%s\t%s\t%s%s\n",
 359       flag, target_fate[(int)t->fate],
 360       spaces(depth), t->name);
 361
 362   if (DEBUG_CAUSES && t->fate >= T_FATE_NEWER && t->fate <= T_FATE_MISSING)
 363     printf("%s %s\n", target_fate[ (int)t->fate ], t->name);
 364 }
 365
 366
 367 /*
 368  * make0sort() - reorder TARGETS chain by their time (newest to oldest)
 369  */
 370 static TARGETS *make0sort (TARGETS *chain) {
 371   TARGETS *result = 0;
 372   /* We walk chain, taking each item and inserting it on the */
 373   /* sorted result, with newest items at the front.  This involves */
 374   /* updating each TARGETS' c->next and c->tail.  Note that we */
 375   /* make c->tail a valid prev pointer for every entry.  Normally, */
 376   /* it is only valid at the head, where prev == tail.  Note also */
 377   /* that while tail is a loop, next ends at the end of the chain. */
 378
 379   /* Walk current target list */
 380   while (chain) {
 381     TARGETS *c = chain;
 382     TARGETS *s = result;
 383
 384     chain = chain->next;
 385     /* Find point s in result for c */
 386     while (s && s->target->time > c->target->time) s = s->next;
 387     /* Insert c in front of s (might be 0). */
 388     /* Don't even think of deciphering this. */
 389     c->next = s;      /* good even if s = 0 */
 390     if (result == s) result = c; /* new head of chain? */
 391     if (!s) s = result;    /* wrap to ensure a next */
 392     if (result != c) s->tail->next = c; /* not head? be prev's next */
 393     c->tail = s->tail;      /* take on next's prev */
 394     s->tail = c;      /* make next's prev us */
 395   }
 396
 397   return result;
 398 }