targ.c

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/*
 * Copyright (c) 1988, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)targ.c	8.2 (Berkeley) 3/19/94";
#endif /* not lint */

/*-
 * targ.c --
 *	Functions for maintaining the Lst allTargets. Target nodes are
 * kept in two structures: a Lst, maintained by the list library, and a
 * hash table, maintained by the hash library.
 *
 * Interface:
 *	Targ_Init 	    	Initialization procedure.
 *
 *	Targ_NewGN	    	Create a new GNode for the passed target
 *	    	  	    	(string). The node is *not* placed in the
 *	    	  	    	hash table, though all its fields are
 *	    	  	    	initialized.
 *
 *	Targ_FindNode	    	Find the node for a given target, creating
 *	    	  	    	and storing it if it doesn't exist and the
 *	    	  	    	flags are right (TARG_CREATE)
 *
 *	Targ_FindList	    	Given a list of names, find nodes for all
 *	    	  	    	of them. If a name doesn't exist and the
 *	    	  	    	TARG_NOCREATE flag was given, an error message
 *	    	  	    	is printed. Else, if a name doesn't exist,
 *	    	  	    	its node is created.
 *
 *	Targ_Ignore	    	Return TRUE if errors should be ignored when
 *	    	  	    	creating the given target.
 *
 *	Targ_Silent	    	Return TRUE if we should be silent when
 *	    	  	    	creating the given target.
 *
 *	Targ_Precious	    	Return TRUE if the target is precious and
 *	    	  	    	should not be removed if we are interrupted.
 *
 * Debugging:
 *	Targ_PrintGraph	    	Print out the entire graphm all variables
 *	    	  	    	and statistics for the directory cache. Should
 *	    	  	    	print something for suffixes, too, but...
 */

#include	  <stdio.h>
#include	  <time.h>
#include	  "make.h"
#include	  "hash.h"
#include	  "dir.h"

static Lst        allTargets;	/* the list of all targets found so far */
static Hash_Table targets;	/* a hash table of same */

#define HTSIZE	191		/* initial size of hash table */

/*-
 *-----------------------------------------------------------------------
 * Targ_Init --
 *	Initialize this module
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	The allTargets list and the targets hash table are initialized
 *-----------------------------------------------------------------------
 */
void
Targ_Init ()
{
    allTargets = Lst_Init (FALSE);
    Hash_InitTable (&targets, HTSIZE);
}

/*-
 *-----------------------------------------------------------------------
 * Targ_NewGN  --
 *	Create and initialize a new graph node
 *
 * Results:
 *	An initialized graph node with the name field filled with a copy
 *	of the passed name
 *
 * Side Effects:
 *	None.
 *-----------------------------------------------------------------------
 */
GNode *
Targ_NewGN (name)
    char           *name;	/* the name to stick in the new node */
{
    register GNode *gn;

    gn = (GNode *) emalloc (sizeof (GNode));
    gn->name = strdup (name);
    gn->path = (char *) 0;
    if (name[0] == '-' && name[1] == 'l') {
	gn->type = OP_LIB;
    } else {
	gn->type = 0;
    }
    gn->unmade =    	0;
    gn->make = 	    	FALSE;
    gn->made = 	    	UNMADE;
    gn->childMade = 	FALSE;
    gn->mtime = gn->cmtime = 0;
    gn->iParents =  	Lst_Init (FALSE);
    gn->cohorts =   	Lst_Init (FALSE);
    gn->parents =   	Lst_Init (FALSE);
    gn->children =  	Lst_Init (FALSE);
    gn->successors = 	Lst_Init(FALSE);
    gn->preds =     	Lst_Init(FALSE);
    gn->context =   	Lst_Init (FALSE);
    gn->commands =  	Lst_Init (FALSE);
    gn->suffix =	NULL;

    return (gn);
}

/*-
 *-----------------------------------------------------------------------
 * Targ_FindNode  --
 *	Find a node in the list using the given name for matching
 *
 * Results:
 *	The node in the list if it was. If it wasn't, return NILGNODE of
 *	flags was TARG_NOCREATE or the newly created and initialized node
 *	if it was TARG_CREATE
 *
 * Side Effects:
 *	Sometimes a node is created and added to the list
 *-----------------------------------------------------------------------
 */
GNode *
Targ_FindNode (name, flags)
    char           *name;	/* the name to find */
    int             flags;	/* flags governing events when target not
				 * found */
{
    GNode         *gn;	      /* node in that element */
    Hash_Entry	  *he;	      /* New or used hash entry for node */
    Boolean	  isNew;      /* Set TRUE if Hash_CreateEntry had to create */
			      /* an entry for the node */


    if (flags & TARG_CREATE) {
	he = Hash_CreateEntry (&targets, name, &isNew);
	if (isNew) {
	    gn = Targ_NewGN (name);
	    Hash_SetValue (he, gn);
	    (void) Lst_AtEnd (allTargets, (ClientData)gn);
	}
    } else {
	he = Hash_FindEntry (&targets, name);
    }

    if (he == (Hash_Entry *) NULL) {
	return (NILGNODE);
    } else {
	return ((GNode *) Hash_GetValue (he));
    }
}

/*-
 *-----------------------------------------------------------------------
 * Targ_FindList --
 *	Make a complete list of GNodes from the given list of names 
 *
 * Results:
 *	A complete list of graph nodes corresponding to all instances of all
 *	the names in names. 
 *
 * Side Effects:
 *	If flags is TARG_CREATE, nodes will be created for all names in
 *	names which do not yet have graph nodes. If flags is TARG_NOCREATE,
 *	an error message will be printed for each name which can't be found.
 * -----------------------------------------------------------------------
 */
Lst
Targ_FindList (names, flags)
    Lst        	   names;	/* list of names to find */
    int            flags;	/* flags used if no node is found for a given
				 * name */
{
    Lst            nodes;	/* result list */
    register LstNode  ln;		/* name list element */
    register GNode *gn;		/* node in tLn */
    char    	  *name;

    nodes = Lst_Init (FALSE);

    if (Lst_Open (names) == FAILURE) {
	return (nodes);
    }
    while ((ln = Lst_Next (names)) != NILLNODE) {
	name = (char *)Lst_Datum(ln);
	gn = Targ_FindNode (name, flags);
	if (gn != NILGNODE) {
	    /*
	     * Note: Lst_AtEnd must come before the Lst_Concat so the nodes
	     * are added to the list in the order in which they were
	     * encountered in the makefile.
	     */
	    (void) Lst_AtEnd (nodes, (ClientData)gn);
	    if (gn->type & OP_DOUBLEDEP) {
		(void)Lst_Concat (nodes, gn->cohorts, LST_CONCNEW);
	    }
	} else if (flags == TARG_NOCREATE) {
	    Error ("\"%s\" -- target unknown.", name);
	}
    }
    Lst_Close (names);
    return (nodes);
}

/*-
 *-----------------------------------------------------------------------
 * Targ_Ignore  --
 *	Return true if should ignore errors when creating gn
 *
 * Results:
 *	TRUE if should ignore errors
 *
 * Side Effects:
 *	None
 *-----------------------------------------------------------------------
 */
Boolean
Targ_Ignore (gn)
    GNode          *gn;		/* node to check for */
{
    if (ignoreErrors || gn->type & OP_IGNORE) {
	return (TRUE);
    } else {
	return (FALSE);
    }
}

/*-
 *-----------------------------------------------------------------------
 * Targ_Silent  --
 *	Return true if be silent when creating gn
 *
 * Results:
 *	TRUE if should be silent
 *
 * Side Effects:
 *	None
 *-----------------------------------------------------------------------
 */
Boolean
Targ_Silent (gn)
    GNode          *gn;		/* node to check for */
{
    if (beSilent || gn->type & OP_SILENT) {
	return (TRUE);