/* Target file hash table management for GNU Make.
Copyright (C) 1988,89,90,91,92,93,94,95,96,97 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include <assert.h>

#include "make.h"
#include "dep.h"
#include "filedef.h"
#include "job.h"
#include "commands.h"
#include "variable.h"


/* Hash table of files the makefile knows how to make.  */

#ifndef	FILE_BUCKETS
#define FILE_BUCKETS	1007
#endif
static struct file *files[FILE_BUCKETS];

/* Number of files with the `intermediate' flag set.  */

unsigned int num_intermediates = 0;

/* Current value for pruning the scan of the goal chain (toggle 0/1).  */

unsigned int considered = 0;

/* Access the hash table of all file records.
   lookup_file  given a name, return the struct file * for that name,
           or nil if there is none.
   enter_file   similar, but create one if there is none.  */

struct file *
lookup_file (name)
     char *name;
{
  register struct file *f;
  register char *n;
  register unsigned int hashval;
#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
  register char *lname, *ln;
#endif

  if (*name == '\0')
    abort ();

  /* This is also done in parse_file_seq, so this is redundant
     for names read from makefiles.  It is here for names passed
     on the command line.  */
#ifdef VMS
# ifndef WANT_CASE_SENSITIVE_TARGETS
  lname = (char *)malloc(strlen(name) + 1);
  for (n=name, ln=lname; *n != '\0'; ++n, ++ln)
    *ln = isupper((unsigned char)*n) ? tolower((unsigned char)*n) : *n;
  *ln = '\0';
  name = lname;
# endif

  while (name[0] == '[' && name[1] == ']' && name[2] != '\0')
      name += 2;
#endif
  while (name[0] == '.' && name[1] == '/' && name[2] != '\0')
    {
      name += 2;
      while (*name == '/')
	/* Skip following slashes: ".//foo" is "foo", not "/foo".  */
	++name;
    }

  if (*name == '\0')
    /* It was all slashes after a dot.  */
#ifdef VMS
    name = "[]";
#else
#ifdef _AMIGA
    name = "";
#else
    name = "./";
#endif /* AMIGA */
#endif /* VMS */

  hashval = 0;
  for (n = name; *n != '\0'; ++n)
    HASHI (hashval, *n);
  hashval %= FILE_BUCKETS;

  for (f = files[hashval]; f != 0; f = f->next)
    {
      if (strieq (f->hname, name))
	{
#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
	  free (lname);
#endif
	  return f;
	}
    }
#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
  free (lname);
#endif
  return 0;
}

struct file *
enter_file (name)
     char *name;
{
  register struct file *f, *new;
  register char *n;
  register unsigned int hashval;
#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
  char *lname, *ln;
#endif

  if (*name == '\0')
    abort ();

#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
  lname = (char *)malloc (strlen (name) + 1);
  for (n = name, ln = lname; *n != '\0'; ++n, ++ln)
    {
      if (isupper((unsigned char)*n))
	*ln = tolower((unsigned char)*n);
      else
	*ln = *n;
    }
  *ln = 0;
  /* Creates a possible leak, old value of name is unreachable, but I
     currently don't know how to fix it. */
  name = lname;
#endif

  hashval = 0;
  for (n = name; *n != '\0'; ++n)
    HASHI (hashval, *n);
  hashval %= FILE_BUCKETS;

  for (f = files[hashval]; f != 0; f = f->next)
    if (strieq (f->hname, name))
      break;

  if (f != 0 && !f->double_colon)
    {
#if defined(VMS) && !defined(WANT_CASE_SENSITIVE_TARGETS)
      free(lname);
#endif
      return f;
    }

  new = (struct file *) xmalloc (sizeof (struct file));
  bzero ((char *) new, sizeof (struct file));
  new->name = new->hname = name;
  new->update_status = -1;

  if (f == 0)
    {
      /* This is a completely new file.  */
      new->next = files[hashval];
      files[hashval] = new;
    }
  else
    {
      /* There is already a double-colon entry for this file.  */
      new->double_colon = f;
      while (f->prev != 0)
	f = f->prev;
      f->prev = new;
    }

  return new;
}

/* Rehash FILE to NAME.  This is not as simple as resetting
   the `hname' member, since it must be put in a new hash bucket,
   and possibly merged with an existing file called NAME.  */

void
rehash_file (file, name)
     register struct file *file;
     char *name;
{
  char *oldname = file->hname;
  register unsigned int oldhash;
  register char *n;

  while (file->renamed != 0)
    file = file->renamed;

  /* Find the hash values of the old and new names.  */

  oldhash = 0;
  for (n = oldname; *n != '\0'; ++n)
    HASHI (oldhash, *n);

  file_hash_enter (file, name, oldhash, file->name);
}

/* Rename FILE to NAME.  This is not as simple as resetting
   the `name' member, since it must be put in a new hash bucket,
   and possibly merged with an existing file called NAME.  */

void
rename_file (file, name)
     register struct file *file;
     char *name;
{
  rehash_file(file, name);
  while (file)
    {
      file->name = file->hname;
      file = file->prev;
    }
}

void
file_hash_enter (file, name, oldhash, oldname)
     register struct file *file;
     char *name;
     unsigned int oldhash;
     char *oldname;
{
  unsigned int oldbucket = oldhash % FILE_BUCKETS;
  register unsigned int newhash, newbucket;
  struct file *oldfile;
  register char *n;
  register struct file *f;

  newhash = 0;
  for (n = name; *n != '\0'; ++n)
    HASHI (newhash, *n);
  newbucket = newhash % FILE_BUCKETS;

  /* Look for an existing file under the new name.  */

  for (oldfile = files[newbucket]; oldfile != 0; oldfile = oldfile->next)
    if (strieq (oldfile->hname, name))
      break;

  /* If the old file is the same as the new file, something's wrong.  */
  assert (oldfile != file);

  if (oldhash != 0 && (newbucket != oldbucket || oldfile != 0))
    {
      /* Remove FILE from its hash bucket.  */

      struct file *lastf = 0;

      for (f = files[oldbucket]; f != file; f = f->next)
	lastf = f;

      if (lastf == 0)
	files[oldbucket] = f->next;
      else
	lastf->next = f->next;
    }

  /* Give FILE its new name.  */

  file->hname = name;
  for (f = file->double_colon; f != 0; f = f->prev)
    f->hname = name;

  if (oldfile == 0)
    {
      /* There is no existing file with the new name.  */

      if (newbucket != oldbucket)
	{
	  /* Put FILE in its new hash bucket.  */
	  file->next = files[newbucket];
	  files[newbucket] = file;
	}
    }
  else
    {
      /* There is an existing file with the new name.
	 We must merge FILE into the existing file.  */

      register struct dep *d;

      if (file->cmds != 0)
	{
	  if (oldfile->cmds == 0)
	    oldfile->cmds = file->cmds;
	  else if (file->cmds != oldfile->cmds)
	    {
	      /* We have two sets of commands.  We will go with the
		 one given in the rule explicitly mentioning this name,
		 but give a message to let the user know what's going on.  */
	      if (oldfile->cmds->fileinfo.filenm != 0)
                error (&file->cmds->fileinfo,
                                _("Commands were specified for \
file `%s' at %s:%lu,"),
                                oldname, oldfile->cmds->fileinfo.filenm,
                                oldfile->cmds->fileinfo.lineno);
	      else
		error (&file->cmds->fileinfo,
				_("Commands for file `%s' were found by \
implicit rule search,"),
				oldname);
	      error (&file->cmds->fileinfo,
			      _("but `%s' is now considered the same file \
as `%s'."),
			      oldname, name);
	      error (&file->cmds->fileinfo,
			      _("Commands for `%s' will be ignored \
in favor of those for `%s'."),
			      name, oldname);
	    }
	}

      /* Merge the dependencies of the two files.  */

      d = oldfile->deps;
      if (d == 0)
	oldfile->deps = file->deps;
      else
	{
	  while (d->next != 0)
	    d = d->next;
	  d->next = file->deps;
	}

      merge_variable_set_lists (&oldfile->variables, file->variables);

      if (oldfile->double_colon && file->is_target && !file->double_colon)
	fatal (NILF, _("can't rename single-colon `%s' to double-colon `%s'"),
	       oldname, name);
      if (!oldfile->double_colon  && file->double_colon)
	{
	  if (oldfile->is_target)
	    fatal (NILF, _("can't rename double-colon `%s' to single-colon `%s'"),
		   oldname, name);
	  else
	    oldfile->double_colon = file->double_colon;
	}

      if (file->last_mtime > oldfile->last_mtime)
	/* %%% Kludge so -W wins on a file that gets vpathized.  */
	oldfile->last_mtime = file->last_mtime;

      oldfile->mtime_before_update = file->mtime_before_update;

#define MERGE(field) oldfile->field |= file->field
      MERGE (precious);
      MERGE (tried_implicit);
      MERGE (updating);
      MERGE (updated);
      MERGE (is_target);
      MERGE (cmd_target);
      MERGE (phony);
      MERGE (ignore_vpath);
#undef MERGE

      file->renamed = oldfile;
    }
}

/* Remove all nonprecious intermediate files.
   If SIG is nonzero, this was caused by a fatal signal,
   meaning that a different message will be printed, and
   the message will go to stderr rather than stdout.  */

void
remove_intermediates (sig)
     int sig;
{
  register int i;
  register struct file *f;
  char doneany;

  if (question_flag || touch_flag)
    return;
  if (sig && just_print_flag)
    return;

  doneany = 0;
  for (i = 0; i < FILE_BUCKETS; ++i)
    for (f = files[i]; f != 0; f = f->next)
      if (f->intermediate && (f->dontcare || !f->precious)
	  && !f->secondary)
	{
	  int status;
	  if (f->update_status == -1)
	    /* If nothing would have created this file yet,
	       don't print an "rm" command for it.  */
            continue;
 	  else if (just_print_flag)
  	    status = 0;
	  else
	    {
	      status = unlink (f->name);
	      if (status < 0 && errno == ENOENT)
		continue;
	    }
	  if (!f->dontcare)
	    {
	      if (sig)
		error (NILF, _("*** Deleting intermediate file `%s'"), f->name);
	      else if (!silent_flag)
		{
		  if (! doneany)
		    {
		      fputs ("rm ", stdout);
		      doneany = 1;
		    }
		  else
		    putchar (' ');
		  fputs (f->name, stdout);
		  fflush (stdout);
		}
	      if (status < 0)
		perror_with_name ("unlink: ", f->name);
	    }
	}

  if (doneany && !sig)
    {
      putchar ('\n');
      fflush (stdout);
    }
}

/* For each dependency of each file, make the `struct dep' point
   at the appropriate `struct file' (which may have to be created).

   Also mark the files depended on by .PRECIOUS, .PHONY, .SILENT,
   and various other special targets.  */

void
snap_deps ()
{
  register struct file *f, *f2;
  register struct dep *d;
  register int i;

  /* Enter each dependency name as a file.  */
  for (i = 0; i < FILE_BUCKETS; ++i)
    for (f = files[i]; f != 0; f = f->next)
      for (f2 = f; f2 != 0; f2 = f2->prev)
	for (d = f2->deps; d != 0; d = d->next)
	  if (d->name != 0)
	    {
	      d->file = lookup_file (d->name);
	      if (d->file == 0)
		d->file = enter_file (d->name);
	      else
		free (d->name);
	      d->name = 0;
	    }

  for (f = lookup_file (".PRECIOUS"); f != 0; f = f->prev)
    for (d = f->deps; d != 0; d = d->next)
      for (f2 = d->file; f2 != 0; f2 = f2->prev)
	f2->precious = 1;

  for (f = lookup_file (".PHONY"); f != 0; f = f->prev)
    for (d = f->deps; d != 0; d = d->next)
      for (f2 = d->file; f2 != 0; f2 = f2->prev)
	{
	  /* Mark this file as phony and nonexistent.  */
	  f2->phony = 1;
	  f2->last_mtime = (FILE_TIMESTAMP) -1;
	  f2->mtime_before_update = (FILE_TIMESTAMP) -1;
	}

  for (f = lookup_file (".INTERMEDIATE"); f != 0; f = f->prev)
    {
      /* .INTERMEDIATE with deps listed
	 marks those deps as intermediate files.  */
      for (d = f->deps; d != 0; d = d->next)
	for (f2 = d->file; f2 != 0; f2 = f2->prev)
	  f2->intermediate = 1;
      /* .INTERMEDIATE with no deps does nothing.
	 Marking all files as intermediates is useless
	 since the goal targets would be deleted after they are built.  */
    }

  for (f = lookup_file (".SECONDARY"); f != 0; f = f->prev)
    {
      /* .SECONDARY with deps listed
	 marks those deps as intermediate files
	 in that they don't get rebuilt if not actually needed;
	 but unlike real intermediate files,
	 these are not deleted after make finishes.  */
      if (f->deps)
	{
	  for (d = f->deps; d != 0; d = d->next)
	    for (f2 = d->file; f2 != 0; f2 = f2->prev)
	      f2->intermediate = f2->secondary = 1;
	}
      /* .SECONDARY with no deps listed marks *all* files that way.  */
      else
	{
	  int i;
	  for (i = 0; i < FILE_BUCKETS; i++)
	    for (f2 = files[i]; f2; f2= f2->next)
	      f2->intermediate = f2->secondary = 1;
	}
    }

  f = lookup_file (".EXPORT_ALL_VARIABLES");
  if (f != 0 && f->is_target)
    export_all_variables = 1;

  f = lookup_file (".IGNORE");
  if (f != 0 && f->is_target)
    {
      if (f->deps == 0)
	ignore_errors_flag = 1;
      else
	for (d = f->deps; d != 0; d = d->next)
	  for (f2 = d->file; f2 != 0; f2 = f2->prev)
	    f2->command_flags |= COMMANDS_NOERROR;
    }

  f = lookup_file (".SILENT");
  if (f != 0 && f->is_target)
    {
      if (f->deps == 0)
	silent_flag = 1;
      else
	for (d = f->deps; d != 0; d = d->next)
	  for (f2 = d->file; f2 != 0; f2 = f2->prev)
	    f2->command_flags |= COMMANDS_SILENT;
    }

  f = lookup_file (".POSIX");
  if (f != 0 && f->is_target)
    posix_pedantic = 1;

  f = lookup_file (".NOTPARALLEL");
  if (f != 0 && f->is_target)
    not_parallel = 1;
}

/* Set the `command_state' member of FILE and all its `also_make's.  */

void
set_command_state (file, state)
     struct file *file;
     int state;
{
  struct dep *d;

  file->command_state = state;

  for (d = file->also_make; d != 0; d = d->next)
    d->file->command_state = state;
}

/* Get and print file timestamps.  */

FILE_TIMESTAMP
file_timestamp_now ()
{
#if HAVE_CLOCK_GETTIME && defined CLOCK_REALTIME
  struct timespec timespec;
  if (clock_gettime (CLOCK_REALTIME, &timespec) == 0)
    return FILE_TIMESTAMP_FROM_S_AND_NS (timespec.tv_sec, timespec.tv_nsec);
#endif
  return FILE_TIMESTAMP_FROM_S_AND_NS (time ((time_t *) 0), 0);
}

void
file_timestamp_sprintf (p, ts)
     char *p;
     FILE_TIMESTAMP ts;
{
  time_t t = FILE_TIMESTAMP_S (ts);
  struct tm *tm = localtime (&t);

  if (tm)
    sprintf (p, "%04d-%02d-%02d %02d:%02d:%02d",
	     tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
	     tm->tm_hour, tm->tm_min, tm->tm_sec);
  else if (t < 0)
    sprintf (p, "%ld", (long) t);
  else
    sprintf (p, "%lu", (unsigned long) t);
  p += strlen (p);

  /* Append nanoseconds as a fraction, but remove trailing zeros.
     We don't know the actual timestamp resolution, since clock_getres
     applies only to local times, whereas this timestamp might come
     from a remote filesystem.  So removing trailing zeros is the
     best guess that we can do.  */
  sprintf (p, ".%09ld", (long) FILE_TIMESTAMP_NS (ts));
  p += strlen (p) - 1;
  while (*p == '0')
    p--;
  p += *p != '.';

  *p = '\0';
}

/* Print the data base of files.  */

static void
print_file (f)
     struct file *f;
{
  register struct dep *d;

  putchar ('\n');
  if (!f->is_target)
    puts (_("# Not a target:"));
  printf ("%s:%s", f->name, f->double_colon ? ":" : "");

  for (d = f->deps; d != 0; d = d->next)
    printf (" %s", dep_name (d));
  putchar ('\n');

  if (f->precious)
    puts (_("#  Precious file (prerequisite of .PRECIOUS)."));
  if (f->phony)
    puts (_("#  Phony target (prerequisite of .PHONY)."));
  if (f->cmd_target)
    puts (_("#  Command-line target."));
  if (f->dontcare)
    puts (_("#  A default or MAKEFILES makefile."));
  puts (f->tried_implicit
        ? _("#  Implicit rule search has been done.")
        : _("#  Implicit rule search has not been done."));
  if (f->stem != 0)
    printf (_("#  Implicit/static pattern stem: `%s'\n"), f->stem);
  if (f->intermediate)
    puts (_("#  File is an intermediate prerequisite."));
  if (f->also_make != 0)
    {
      fputs (_("#  Also makes:"), stdout);
      for (d = f->also_make; d != 0; d = d->next)
	printf (" %s", dep_name (d));
      putchar ('\n');
    }
  if (f->last_mtime == 0)
    puts (_("#  Modification time never checked."));
  else if (f->last_mtime == (FILE_TIMESTAMP) -1)
    puts (_("#  File does not exist."));
  else
    {
      char buf[FILE_TIMESTAMP_PRINT_LEN_BOUND + 1];
      file_timestamp_sprintf (buf, f->last_mtime);
      printf (_("#  Last modified %s\n"), buf);
    }
  puts (f->updated
        ? _("#  File has been updated.") : _("#  File has not been updated."));
  switch (f->command_state)
    {
    case cs_running:
      puts (_("#  Commands currently running (THIS IS A BUG)."));
      break;
    case cs_deps_running:
      puts (_("#  Dependencies commands running (THIS IS A BUG)."));
      break;
    case cs_not_started:
    case cs_finished:
      switch (f->update_status)
	{
	case -1:
	  break;
	case 0:
	  puts (_("#  Successfully updated."));
	  break;
	case 1:
	  assert (question_flag);
	  puts (_("#  Needs to be updated (-q is set)."));
	  break;
	case 2:
	  puts (_("#  Failed to be updated."));
	  break;
	default:
	  puts (_("#  Invalid value in `update_status' member!"));
	  fflush (stdout);
	  fflush (stderr);
	  abort ();
	}
      break;
    default:
      puts (_("#  Invalid value in `command_state' member!"));
      fflush (stdout);
      fflush (stderr);
      abort ();
    }

  if (f->variables != 0)
    print_file_variables (f);

  if (f->cmds != 0)
    print_commands (f->cmds);
}

void
print_file_data_base ()
{
  register unsigned int i, nfiles, per_bucket;
  register struct file *file;

  puts (_("\n# Files"));

  per_bucket = nfiles = 0;
  for (i = 0; i < FILE_BUCKETS; ++i)
    {
      register unsigned int this_bucket = 0;

      for (file = files[i]; file != 0; file = file->next)
	{
	  register struct file *f;

	  ++this_bucket;

	  for (f = file; f != 0; f = f->prev)
	    print_file (f);
	}

      nfiles += this_bucket;
      if (this_bucket > per_bucket)
	per_bucket = this_bucket;
    }

  if (nfiles == 0)
    puts (_("\n# No files."));
  else
    {
      printf (_("\n# %u files in %u hash buckets.\n"), nfiles, FILE_BUCKETS);
#ifndef	NO_FLOAT
      printf (_("# average %.3f files per bucket, max %u files in one bucket.\n"),
	      ((double) nfiles) / ((double) FILE_BUCKETS), per_bucket);
#endif
    }
}

/* EOF */