/* $XConsortium: parse.c /main/33 1996/12/04 10:11:28 swick $ */

/*

Copyright (c) 1993, 1994  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be

used in advertising or otherwise to promote the sale, use or other dealings

in this Software without prior written authorization from the X Consortium.

*/

/* $XFree86: xc/config/makedepend/parse.c,v 1.3 1997/01/12 10:39:45 dawes Exp $ */

#include "def.h"

extern char	*directives[];

extern struct inclist	maininclist;

int

gobble(filep, file, file_red)

	register struct filepointer *filep;

	struct inclist		*file, *file_red;

{

	register char	*line;

	register int	type;

	while (line = getline(filep)) {

		switch(type = deftype(line, filep, file_red, file, FALSE)) {

		case IF:

		case IFFALSE:

		case IFGUESSFALSE:

		case IFDEF:

		case IFNDEF:

			type = gobble(filep, file, file_red);

			while ((type == ELIF) || (type == ELIFFALSE) ||

			       (type == ELIFGUESSFALSE))

			    type = gobble(filep, file, file_red);

			if (type == ELSE)

			        (void)gobble(filep, file, file_red);

			break;

		case ELSE:

		case ENDIF:

			debug(0,("%s, line %d: #%s\n",

				file->i_file, filep->f_line,

				directives[type]));

			return(type);

		case DEFINE:

		case UNDEF:

		case INCLUDE:

		case INCLUDEDOT:

		case PRAGMA:

		case ERROR:

		case IDENT:

		case SCCS:

		case EJECT:

		case WARNING:

			break;

		case ELIF:

		case ELIFFALSE:

		case ELIFGUESSFALSE:

			return(type);

		case -1:

			warning("%s, line %d: unknown directive == \"%s\"\n",

				file_red->i_file, filep->f_line, line);

			break;

		}

	}

	return(-1);

}

/*

 * Decide what type of # directive this line is.

 */

int deftype (line, filep, file_red, file, parse_it)

	register char	*line;

	register struct filepointer *filep;

	register struct inclist *file_red, *file;

	int	parse_it;

{

	register char	*p;

	char	*directive, savechar;

	register int	ret;

	/*

	 * Parse the directive...

	 */

	directive=line+1;

	while (*directive == ' ' || *directive == '\t')

		directive++;

	p = directive;

	while (*p >= 'a' && *p <= 'z')

		p++;

	savechar = *p;

	*p = '\0';

	ret = match(directive, directives);

	*p = savechar;

	/* If we don't recognize this compiler directive or we happen to just

	 * be gobbling up text while waiting for an #endif or #elif or #else

	 * in the case of an #elif we must check the zero_value and return an

	 * ELIF or an ELIFFALSE.

	 */

	if (ret == ELIF && !parse_it)

	{

	    while (*p == ' ' || *p == '\t')

		p++;

	    /*

	     * parse an expression.

	     */

	    debug(0,("%s, line %d: #elif %s ",

		   file->i_file, filep->f_line, p));

	    ret = zero_value(p, filep, file_red);

	    if (ret != IF)

	    {

		debug(0,("false...\n"));

		if (ret == IFFALSE)

		    return(ELIFFALSE);

		else

		    return(ELIFGUESSFALSE);

	    }

	    else

	    {

		debug(0,("true...\n"));

		return(ELIF);

	    }

	}

	if (ret < 0 || ! parse_it)

		return(ret);

	/*

	 * now decide how to parse the directive, and do it.

	 */

	while (*p == ' ' || *p == '\t')

		p++;

	switch (ret) {

	case IF:

		/*

		 * parse an expression.

		 */

		ret = zero_value(p, filep, file_red);

		debug(0,("%s, line %d: %s #if %s\n",

			 file->i_file, filep->f_line, ret?"false":"true", p));

		break;

	case IFDEF:

	case IFNDEF:

		debug(0,("%s, line %d: #%s %s\n",

			file->i_file, filep->f_line, directives[ret], p));

	case UNDEF:

		/*

		 * separate the name of a single symbol.

		 */

		while (isalnum(*p) || *p == '_')

			*line++ = *p++;

		*line = '\0';

		break;

	case INCLUDE:

		debug(2,("%s, line %d: #include %s\n",

			file->i_file, filep->f_line, p));

		/* Support ANSI macro substitution */

		{

		    struct symtab **sym = isdefined(p, file_red, NULL);

		    while (sym) {

			p = (*sym)->s_value;

			debug(3,("%s : #includes SYMBOL %s = %s\n",

			       file->i_incstring,

			       (*sym) -> s_name,

			       (*sym) -> s_value));

			/* mark file as having included a 'soft include' */

			file->i_flags |= INCLUDED_SYM; 

			sym = isdefined(p, file_red, NULL);

		    }

		}

		/*

		 * Separate the name of the include file.

		 */

		while (*p && *p != '"' && *p != '<')

			p++;

		if (! *p)

			return(-2);

		if (*p++ == '"') {

			ret = INCLUDEDOT;

			while (*p && *p != '"')

				*line++ = *p++;

		} else

			while (*p && *p != '>')

				*line++ = *p++;

		*line = '\0';

		break;

	case DEFINE:

		/*

		 * copy the definition back to the beginning of the line.

		 */

		strcpy (line, p);

		break;

	case ELSE:

	case ENDIF:

	case ELIF:

	case PRAGMA:

	case ERROR:

	case IDENT:

	case SCCS:

	case EJECT:

	case WARNING:

		debug(0,("%s, line %d: #%s\n",

			file->i_file, filep->f_line, directives[ret]));

		/*

		 * nothing to do.

		 */

		break;

	}

	return(ret);

}

struct symtab **fdefined(symbol, file, srcfile)

	register char	*symbol;

	struct inclist	*file;

	struct inclist	**srcfile;

{

	register struct inclist	**ip;

	register struct symtab	**val;

	register int	i;

	static int	recurse_lvl = 0;

	if (file->i_flags & DEFCHECKED)

		return(NULL);

	file->i_flags |= DEFCHECKED;

	if (val = slookup(symbol, file))

		debug(1,("%s defined in %s as %s\n",

			 symbol, file->i_file, (*val)->s_value));

	if (val == NULL && file->i_list)

		{

		for (ip = file->i_list, i=0; i < file->i_listlen; i++, ip++)

			if (file->i_merged[i]==FALSE) {

				val = fdefined(symbol, *ip, srcfile);

				if ((*ip)->i_flags & FINISHED) {

					merge2defines(file,*ip);

					file->i_merged[i]=TRUE;

				    }

				if (val!=NULL) break;

			}

		}

	else if (val != NULL && srcfile != NULL) *srcfile = file;

	recurse_lvl--;

	file->i_flags &= ~DEFCHECKED;

	return(val);

}

struct symtab **isdefined(symbol, file, srcfile)

	register char	*symbol;

	struct inclist	*file;

	struct inclist	**srcfile;

{

	register struct symtab	**val;

	if (val = slookup(symbol, &maininclist)) {

		debug(1,("%s defined on command line\n", symbol));

		if (srcfile != NULL) *srcfile = &maininclist;

		return(val);

	}

	if (val = fdefined(symbol, file, srcfile))

		return(val);

	debug(1,("%s not defined in %s\n", symbol, file->i_file));

	return(NULL);

}

/*

 * Return type based on if the #if expression evaluates to 0

 */

int

zero_value(exp, filep, file_red)

	register char	*exp;

	register struct filepointer *filep;

	register struct inclist *file_red;

{

	if (cppsetup(exp, filep, file_red))

	    return(IFFALSE);

	else

	    return(IF);

}

void

define2(name, val, file)

	char	*name, *val;

	struct inclist	*file;

{

    int first, last, below;

    register struct symtab **sp = NULL, **dest;

    struct symtab *stab;

    /* Make space if it's needed */

    if (file->i_defs == NULL)

    {

	file->i_defs = (struct symtab **)

			malloc(sizeof (struct symtab*) * SYMTABINC);

	file->i_ndefs = 0;

    }

    else if (!(file->i_ndefs % SYMTABINC))

	file->i_defs = (struct symtab **)

			realloc(file->i_defs,

			   sizeof(struct symtab*)*(file->i_ndefs+SYMTABINC));

    if (file->i_defs == NULL)

	fatalerr("malloc()/realloc() failure in insert_defn()\n");

    below = first = 0;

    last = file->i_ndefs - 1;

    while (last >= first)

    {

	/* Fast inline binary search */

	register char *s1;

	register char *s2;

	register int middle = (first + last) / 2;

	/* Fast inline strchr() */

	s1 = name;

	s2 = file->i_defs[middle]->s_name;

	while (*s1++ == *s2++)

	    if (s2[-1] == '\0') break;

	/* If exact match, set sp and break */

	if (*--s1 == *--s2) 

	{

	    sp = file->i_defs + middle;

	    break;

	}

	/* If name > i_defs[middle] ... */

	if (*s1 > *s2) 

	{

	    below = first;

	    first = middle + 1;

	}

	/* else ... */

	else

	{

	    below = last = middle - 1;

	}

    }

    /* Search is done.  If we found an exact match to the symbol name,

       just replace its s_value */

    if (sp != NULL)

    {

	free((*sp)->s_value);

	(*sp)->s_value = copy(val);

	return;

    }

    sp = file->i_defs + file->i_ndefs++;

    dest = file->i_defs + below + 1;

    while (sp > dest)

    {

	*sp = sp[-1];

	sp--;

    }

    stab = (struct symtab *) malloc(sizeof (struct symtab));

    if (stab == NULL)

	fatalerr("malloc()/realloc() failure in insert_defn()\n");

    stab->s_name = copy(name);

    stab->s_value = copy(val);

    *sp = stab;

}

void

define(def, file)

	char	*def;

	struct inclist	*file;

{

    char *val;

    /* Separate symbol name and its value */

    val = def;

    while (isalnum(*val) || *val == '_')

	val++;

    if (*val)

	*val++ = '\0';

    while (*val == ' ' || *val == '\t')

	val++;

    if (!*val)

	val = "1";

    define2(def, val, file);

}

struct symtab **slookup(symbol, file)

	register char	*symbol;

	register struct inclist	*file;

{

	register int first = 0;

	register int last = file->i_ndefs - 1;

	if (file) while (last >= first)

	{

	    /* Fast inline binary search */

	    register char *s1;

	    register char *s2;

	    register int middle = (first + last) / 2;

	    /* Fast inline strchr() */

	    s1 = symbol;

	    s2 = file->i_defs[middle]->s_name;

	    while (*s1++ == *s2++)

	        if (s2[-1] == '\0') break;

	    /* If exact match, we're done */

	    if (*--s1 == *--s2) 

	    {

	        return file->i_defs + middle;

	    }

	    /* If symbol > i_defs[middle] ... */

	    if (*s1 > *s2) 

	    {

	        first = middle + 1;

	    }

	    /* else ... */

	    else

	    {

	        last = middle - 1;

	    }

	}

	return(NULL);

}

int merge2defines(file1, file2)

	struct inclist	*file1;

	struct inclist	*file2;

{

	if ((file1!=NULL) && (file2!=NULL)) 

        {

		int first1 = 0;

		int last1 = file1->i_ndefs - 1;

		int first2 = 0;

		int last2 = file2->i_ndefs - 1;

                int first=0;

                struct symtab** i_defs = NULL;

		int deflen=file1->i_ndefs+file2->i_ndefs;

                if (deflen>0)

                { 

                	/* make sure deflen % SYMTABINC == 0 is still true */

                	deflen += (SYMTABINC - deflen % SYMTABINC) % SYMTABINC;

                	i_defs=(struct symtab**)

			    malloc(deflen*sizeof(struct symtab*));

                	if (i_defs==NULL) return 0;

        	}

        	while ((last1 >= first1) && (last2 >= first2))

        	{

	    		char *s1=file1->i_defs[first1]->s_name;

	    		char *s2=file2->i_defs[first2]->s_name;

     			if (strcmp(s1,s2) < 0)

                        	i_defs[first++]=file1->i_defs[first1++];

     			else if (strcmp(s1,s2) > 0)

                        	i_defs[first++]=file2->i_defs[first2++];

                        else /* equal */

                        {

                        	i_defs[first++]=file2->i_defs[first2++];

                                first1++;

                        }

        	}

        	while (last1 >= first1)

        	{

                        i_defs[first++]=file1->i_defs[first1++];

        	}

        	while (last2 >= first2)

        	{

                        i_defs[first++]=file2->i_defs[first2++];

        	}

                if (file1->i_defs) free(file1->i_defs);

                file1->i_defs=i_defs;

                file1->i_ndefs=first;

		return 1;

  	}

	return 0;

}

void

undefine(symbol, file)

	char	*symbol;

	register struct inclist	*file;

{

	register struct symtab **ptr;

	struct inclist *srcfile;

	while ((ptr = isdefined(symbol, file, &srcfile)) != NULL)

	{

	    srcfile->i_ndefs--;

	    for (; ptr < srcfile->i_defs + srcfile->i_ndefs; ptr++)

		*ptr = ptr[1];

	}

}

int

find_includes(filep, file, file_red, recursion, failOK)

	struct filepointer	*filep;

	struct inclist		*file, *file_red;

	int			recursion;

	boolean			failOK;

{

	register char	*line;

	register int	type;

	boolean recfailOK;

	while (line = getline(filep)) {

		switch(type = deftype(line, filep, file_red, file, TRUE)) {

		case IF:

		doif:

			type = find_includes(filep, file,

				file_red, recursion+1, failOK);

			while ((type == ELIF) || (type == ELIFFALSE) ||

			       (type == ELIFGUESSFALSE))

				type = gobble(filep, file, file_red);

			if (type == ELSE)

				gobble(filep, file, file_red);

			break;

		case IFFALSE:

		case IFGUESSFALSE:

		    doiffalse:

			if (type == IFGUESSFALSE || type == ELIFGUESSFALSE)

			    recfailOK = TRUE;

			else

			    recfailOK = failOK;

			type = gobble(filep, file, file_red);

			if (type == ELSE)

			    find_includes(filep, file,

					  file_red, recursion+1, recfailOK);

			else

			if (type == ELIF)

			    goto doif;

			else

			if ((type == ELIFFALSE) || (type == ELIFGUESSFALSE))

			    goto doiffalse;

			break;

		case IFDEF:

		case IFNDEF:

			if ((type == IFDEF && isdefined(line, file_red, NULL))

			 || (type == IFNDEF && !isdefined(line, file_red, NULL))) {

				debug(1,(type == IFNDEF ?

				    "line %d: %s !def'd in %s via %s%s\n" : "",

				    filep->f_line, line,

				    file->i_file, file_red->i_file, ": doit"));

				type = find_includes(filep, file,

					file_red, recursion+1, failOK);

				while (type == ELIF || type == ELIFFALSE || type == ELIFGUESSFALSE)

					type = gobble(filep, file, file_red);

				if (type == ELSE)

					gobble(filep, file, file_red);

			}

			else {

				debug(1,(type == IFDEF ?

				    "line %d: %s !def'd in %s via %s%s\n" : "",

				    filep->f_line, line,

				    file->i_file, file_red->i_file, ": gobble"));

				type = gobble(filep, file, file_red);

				if (type == ELSE)

					find_includes(filep, file,

						file_red, recursion+1, failOK);

				else if (type == ELIF)

				    	goto doif;

				else if (type == ELIFFALSE || type == ELIFGUESSFALSE)

				    	goto doiffalse;

			}

			break;

		case ELSE:

		case ELIFFALSE:

		case ELIFGUESSFALSE:

		case ELIF:

			if (!recursion)

				gobble(filep, file, file_red);

		case ENDIF:

			if (recursion)

				return(type);

		case DEFINE:

			define(line, file);

			break;

		case UNDEF:

			if (!*line) {

			    warning("%s, line %d: incomplete undef == \"%s\"\n",

				file_red->i_file, filep->f_line, line);

			    break;

			}

			undefine(line, file_red);

			break;

		case INCLUDE:

			add_include(filep, file, file_red, line, FALSE, failOK);

			break;

		case INCLUDEDOT:

			add_include(filep, file, file_red, line, TRUE, failOK);

			break;

		case ERROR:

		case WARNING:

		    	warning("%s: %d: %s\n", file_red->i_file,

				 filep->f_line, line);

		    	break;

		case PRAGMA:

		case IDENT:

		case SCCS:

		case EJECT:

			break;

		case -1:

			warning("%s", file_red->i_file);

			if (file_red != file)

			    warning1(" (reading %s)", file->i_file);

			warning1(", line %d: unknown directive == \"%s\"\n",

				 filep->f_line, line);

			break;

		case -2:

			warning("%s", file_red->i_file);

			if (file_red != file)

			    warning1(" (reading %s)", file->i_file);

			warning1(", line %d: incomplete include == \"%s\"\n",

				 filep->f_line, line);

			break;

		}

	}

	file->i_flags |= FINISHED;

	return(-1);

}