/* 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "make.h"
#include "dep.h"
#include "filedef.h"
#include "job.h"
#include "commands.h"
#include "variable.h"
#include <assert.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;


/* 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 (*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
  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))
	{
	  return f;
	}
    }
  return 0;
}

struct file *
enter_file (name)
     char *name;
{
  register struct file *f, *new;
  register char *n;
  register unsigned int hashval;
#ifdef VMS
  char *lname, *ln;
#endif

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

#ifdef VMS
  lname = (char *)malloc (strlen (name) + 1);
  for (n = name, ln = lname; *n != '\0'; ++n, ++ln)
    {
      if (isupper(*n))
	*ln = tolower(*n);
      else
	*ln = *n;
    }
  *ln = 0;
  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)
    {
#ifdef VMS
      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->filename != 0)
		makefile_error (file->cmds->filename, file->cmds->lineno,
				"Commands were specified for \
file `%s' at %s:%u,",
				oldname, oldfile->cmds->filename,
				oldfile->cmds->lineno);
	      else
		makefile_error (file->cmds->filename, file->cmds->lineno,
				"Commands for file `%s' were found by \
implicit rule search,",
				oldname);
	      makefile_error (file->cmds->filename, file->cmds->lineno,
			      "but `%s' is now considered the same file \
as `%s'.",
			      oldname, name);
	      makefile_error (file->cmds->filename, file->cmds->lineno,
			      "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 ("can't rename single-colon `%s' to double-colon `%s'",
	       oldname, name);
      if (!oldfile->double_colon  && file->double_colon)
	{
	  if (oldfile->is_target)
	    fatal ("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;

#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 ("*** 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 = (time_t) -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;
}

/* 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;
}

/* 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 (dependency of .PRECIOUS).");
  if (f->phony)
    puts ("#  Phony target (dependency of .PHONY).");
  if (f->cmd_target)
    puts ("#  Command-line target.");
  if (f->dontcare)
    puts ("#  A default or MAKEFILES makefile.");
  printf ("#  Implicit rule search has%s been done.\n",
	  f->tried_implicit ? "" : " not");
  if (f->stem != 0)
    printf ("#  Implicit/static pattern stem: `%s'\n", f->stem);
  if (f->intermediate)
    puts ("#  File is an intermediate dependency.");
  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 == (time_t) 0)
    puts ("#  Modification time never checked.");
  else if (f->last_mtime == (time_t) -1)
    puts ("#  File does not exist.");
  else
    printf ("#  Last modified %.24s (%ld)\n",
	    ctime (&f->last_mtime), (long int) f->last_mtime);
  printf ("#  File has%s been updated.\n",
	  f->updated ? "" : " not");
  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 %.1f files per bucket, max %u files in one bucket.\n",
	      ((double) nfiles) / ((double) FILE_BUCKETS) * 100.0, per_bucket);
#endif
    }
}

/* EOF */