577 lines
16 KiB
C
577 lines
16 KiB
C
/* $XConsortium: parse.c,v 1.30 94/04/17 20:10:38 gildea Exp $ */
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/*
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Copyright (c) 1993, 1994 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from the X Consortium.
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*/
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#include "def.h"
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void define( char *def, struct inclist *file );
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void define2(char * name, char * val, struct inclist * file);
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void undefine( char *symbol, register struct inclist *file );
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extern char *directives[];
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extern struct inclist maininclist;
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int find_includes(filep, file, file_red, recursion, failOK, incCollection)
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struct filepointer *filep;
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struct inclist *file, *file_red;
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int recursion;
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boolean failOK;
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struct IncludesCollection* incCollection;
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{
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register char *line;
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register int type;
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boolean recfailOK;
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while ((line = getline(filep))) {
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switch(type = deftype(line, filep, file_red, file, TRUE)) {
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case IF:
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doif:
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type = find_includes(filep, file,
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file_red, recursion+1, failOK, incCollection);
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while ((type == ELIF) || (type == ELIFFALSE) ||
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(type == ELIFGUESSFALSE))
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type = gobble(filep, file, file_red);
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if (type == ELSE)
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gobble(filep, file, file_red);
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break;
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case IFFALSE:
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case IFGUESSFALSE:
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doiffalse:
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if (type == IFGUESSFALSE || type == ELIFGUESSFALSE)
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recfailOK = TRUE;
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else
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recfailOK = failOK;
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type = gobble(filep, file, file_red);
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if (type == ELSE)
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find_includes(filep, file,
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file_red, recursion+1, recfailOK, incCollection);
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else
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if (type == ELIF)
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goto doif;
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else
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if ((type == ELIFFALSE) || (type == ELIFGUESSFALSE))
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goto doiffalse;
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break;
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case IFDEF:
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case IFNDEF:
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if ((type == IFDEF && isdefined(line, file_red, NULL))
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|| (type == IFNDEF && !isdefined(line, file_red, NULL))) {
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debug(1,(type == IFNDEF ?
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"line %d: %s !def'd in %s via %s%s\n" : "",
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filep->f_line, line,
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file->i_file, file_red->i_file, ": doit"));
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type = find_includes(filep, file,
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file_red, recursion+1, failOK, incCollection);
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while (type == ELIF || type == ELIFFALSE || type == ELIFGUESSFALSE)
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type = gobble(filep, file, file_red);
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if (type == ELSE)
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gobble(filep, file, file_red);
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}
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else {
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debug(1,(type == IFDEF ?
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"line %d: %s !def'd in %s via %s%s\n" : "",
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filep->f_line, line,
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file->i_file, file_red->i_file, ": gobble"));
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type = gobble(filep, file, file_red);
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if (type == ELSE)
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find_includes(filep, file,
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file_red, recursion + 1, failOK, incCollection);
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else if (type == ELIF)
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goto doif;
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else if (type == ELIFFALSE || type == ELIFGUESSFALSE)
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goto doiffalse;
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}
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break;
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case ELSE:
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case ELIFFALSE:
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case ELIFGUESSFALSE:
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case ELIF:
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if (!recursion)
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gobble(filep, file, file_red);
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case ENDIF:
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if (recursion)
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return(type);
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case DEFINE:
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define(line, file);
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break;
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case UNDEF:
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if (!*line) {
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warning("%s, line %d: incomplete undef == \"%s\"\n",
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file_red->i_file, filep->f_line, line);
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break;
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}
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undefine(line, file_red);
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break;
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case INCLUDE:
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add_include(filep, file, file_red, line, FALSE, failOK, incCollection);
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break;
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case INCLUDEDOT:
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add_include(filep, file, file_red, line, TRUE, failOK, incCollection);
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break;
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case ERROR:
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warning("%s: %d: %s\n", file_red->i_file,
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filep->f_line, line);
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break;
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case PRAGMA:
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case IDENT:
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case SCCS:
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case EJECT:
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break;
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case -1:
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warning("%s", file_red->i_file);
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if (file_red != file)
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warning1(" (reading %s)", file->i_file);
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warning1(", line %d: unknown directive == \"%s\"\n",
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filep->f_line, line);
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break;
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case -2:
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warning("%s", file_red->i_file);
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if (file_red != file)
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warning1(" (reading %s)", file->i_file);
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warning1(", line %d: incomplete include == \"%s\"\n",
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filep->f_line, line);
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break;
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}
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}
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return(-1);
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}
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int gobble(filep, file, file_red)
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register struct filepointer *filep;
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struct inclist *file, *file_red;
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{
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register char *line;
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register int type;
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while ((line = getline(filep))) {
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switch(type = deftype(line, filep, file_red, file, FALSE)) {
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case IF:
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case IFFALSE:
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case IFGUESSFALSE:
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case IFDEF:
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case IFNDEF:
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type = gobble(filep, file, file_red);
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while ((type == ELIF) || (type == ELIFFALSE) ||
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(type == ELIFGUESSFALSE))
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type = gobble(filep, file, file_red);
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if (type == ELSE)
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(void)gobble(filep, file, file_red);
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break;
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case ELSE:
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case ENDIF:
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debug(0,("%s, line %d: #%s\n",
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file->i_file, filep->f_line,
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directives[type]));
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return(type);
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case DEFINE:
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case UNDEF:
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case INCLUDE:
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case INCLUDEDOT:
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case PRAGMA:
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case ERROR:
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case IDENT:
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case SCCS:
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case EJECT:
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break;
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case ELIF:
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case ELIFFALSE:
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case ELIFGUESSFALSE:
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return(type);
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case -1:
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warning("%s, line %d: unknown directive == \"%s\"\n",
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file_red->i_file, filep->f_line, line);
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break;
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}
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}
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return(-1);
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}
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/*
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* Decide what type of # directive this line is.
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*/
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int deftype (line, filep, file_red, file, parse_it)
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register char *line;
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register struct filepointer *filep;
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register struct inclist *file_red, *file;
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int parse_it;
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{
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register char *p;
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char *directive, savechar;
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register int ret;
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/*
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* Parse the directive...
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*/
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directive=line+1;
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while (*directive == ' ' || *directive == '\t')
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directive++;
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p = directive;
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while (*p >= 'a' && *p <= 'z')
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p++;
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savechar = *p;
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*p = '\0';
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ret = match(directive, directives);
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*p = savechar;
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/* If we don't recognize this compiler directive or we happen to just
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* be gobbling up text while waiting for an #endif or #elif or #else
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* in the case of an #elif we must check the zero_value and return an
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* ELIF or an ELIFFALSE.
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*/
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if (ret == ELIF && !parse_it)
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{
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while (*p == ' ' || *p == '\t')
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p++;
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/*
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* parse an expression.
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*/
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debug(0,("%s, line %d: #elif %s ",
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file->i_file, filep->f_line, p));
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ret = zero_value(p, filep, file_red);
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if (ret != IF)
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{
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debug(0,("false...\n"));
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if (ret == IFFALSE)
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return(ELIFFALSE);
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else
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return(ELIFGUESSFALSE);
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}
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else
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{
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debug(0,("true...\n"));
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return(ELIF);
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}
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}
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if (ret < 0 || ! parse_it)
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return(ret);
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/*
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* now decide how to parse the directive, and do it.
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*/
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while (*p == ' ' || *p == '\t')
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p++;
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switch (ret) {
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case IF:
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/*
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* parse an expression.
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*/
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ret = zero_value(p, filep, file_red);
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debug(0,("%s, line %d: %s #if %s\n",
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file->i_file, filep->f_line, ret?"false":"true", p));
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break;
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case IFDEF:
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case IFNDEF:
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debug(0,("%s, line %d: #%s %s\n",
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file->i_file, filep->f_line, directives[ret], p));
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case UNDEF:
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/*
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* separate the name of a single symbol.
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*/
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while (isalnum(*p) || *p == '_')
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*line++ = *p++;
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*line = '\0';
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break;
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case INCLUDE:
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debug(2,("%s, line %d: #include %s\n",
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file->i_file, filep->f_line, p));
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/* Support ANSI macro substitution */
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{
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struct symtab *sym = isdefined(p, file_red, NULL);
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while (sym) {
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p = sym->s_value;
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debug(3,("%s : #includes SYMBOL %s = %s\n",
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file->i_incstring,
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sym -> s_name,
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sym -> s_value));
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/* mark file as having included a 'soft include' */
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file->i_included_sym = TRUE;
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sym = isdefined(p, file_red, NULL);
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}
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}
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/*
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* Separate the name of the include file.
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*/
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while (*p && *p != '"' && *p != '<')
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p++;
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if (! *p)
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return(-2);
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if (*p++ == '"') {
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ret = INCLUDEDOT;
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while (*p && *p != '"')
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*line++ = *p++;
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} else
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while (*p && *p != '>')
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*line++ = *p++;
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*line = '\0';
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break;
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case DEFINE:
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/*
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* copy the definition back to the beginning of the line.
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*/
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strcpy (line, p);
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break;
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case ELSE:
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case ENDIF:
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case ELIF:
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case PRAGMA:
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case ERROR:
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case IDENT:
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case SCCS:
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case EJECT:
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debug(0,("%s, line %d: #%s\n",
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file->i_file, filep->f_line, directives[ret]));
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/*
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* nothing to do.
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*/
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break;
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}
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return(ret);
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}
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struct symtab *isdefined(symbol, file, srcfile)
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register char *symbol;
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struct inclist *file;
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struct inclist **srcfile;
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{
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register struct symtab *val;
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val = slookup(symbol, &maininclist);
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if (val) {
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debug(1,("%s defined on command line\n", symbol));
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if (srcfile != NULL) *srcfile = &maininclist;
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return(val);
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}
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val = fdefined(symbol, file, srcfile);
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if (val)
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return(val);
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debug(1,("%s not defined in %s\n", symbol, file->i_file));
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return(NULL);
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}
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struct symtab *fdefined(symbol, file, srcfile)
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register char *symbol;
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struct inclist *file;
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struct inclist **srcfile;
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{
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register struct inclist **ip;
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register struct symtab *val;
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register int i;
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static int recurse_lvl = 0;
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if (file->i_defchecked)
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return(NULL);
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file->i_defchecked = TRUE;
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val = slookup(symbol, file);
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if (val)
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debug(1,("%s defined in %s as %s\n", symbol, file->i_file, val->s_value));
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if (val == NULL && file->i_list)
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{
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for (ip = file->i_list, i=0; i < file->i_listlen; i++, ip++)
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{
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val = fdefined(symbol, *ip, srcfile);
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if (val) {
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break;
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}
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}
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}
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else if (val != NULL && srcfile != NULL) *srcfile = file;
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recurse_lvl--;
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file->i_defchecked = FALSE;
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return(val);
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}
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/*
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* Return type based on if the #if expression evaluates to 0
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*/
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int zero_value(exp, filep, file_red)
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register char *exp;
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register struct filepointer *filep;
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register struct inclist *file_red;
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{
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if (cppsetup(exp, filep, file_red))
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return(IFFALSE);
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else
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return(IF);
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}
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void define(def, file)
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char *def;
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struct inclist *file;
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{
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char *val;
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/* Separate symbol name and its value */
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val = def;
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while (isalnum(*val) || *val == '_')
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val++;
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if (*val)
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*val++ = '\0';
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while (*val == ' ' || *val == '\t')
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val++;
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if (!*val)
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val = "1";
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define2(def, val, file);
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}
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void define2(name, val, file)
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char *name, *val;
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struct inclist *file;
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{
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int first, last, below;
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register struct symtab *sp = NULL, *dest;
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/* Make space if it's needed */
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if (file->i_defs == NULL)
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{
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file->i_defs = (struct symtab *)
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malloc(sizeof (struct symtab) * SYMTABINC);
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file->i_deflen = SYMTABINC;
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file->i_ndefs = 0;
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}
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else if (file->i_ndefs == file->i_deflen)
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file->i_defs = (struct symtab *)
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realloc(file->i_defs,
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sizeof(struct symtab)*(file->i_deflen+=SYMTABINC));
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if (file->i_defs == NULL)
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fatalerr("malloc()/realloc() failure in insert_defn()\n");
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below = first = 0;
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last = file->i_ndefs - 1;
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while (last >= first)
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{
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/* Fast inline binary search */
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register char *s1;
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register char *s2;
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register int middle = (first + last) / 2;
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/* Fast inline strchr() */
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s1 = name;
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s2 = file->i_defs[middle].s_name;
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while (*s1++ == *s2++)
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if (s2[-1] == '\0') break;
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/* If exact match, set sp and break */
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if (*--s1 == *--s2)
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{
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sp = file->i_defs + middle;
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break;
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}
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/* If name > i_defs[middle] ... */
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if (*s1 > *s2)
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{
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below = first;
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first = middle + 1;
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}
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/* else ... */
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else
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{
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below = last = middle - 1;
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}
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}
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/* Search is done. If we found an exact match to the symbol name,
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just replace its s_value */
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if (sp != NULL)
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{
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free(sp->s_value);
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sp->s_value = copy(val);
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return;
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}
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sp = file->i_defs + file->i_ndefs++;
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dest = file->i_defs + below + 1;
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while (sp > dest)
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{
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*sp = sp[-1];
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sp--;
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}
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sp->s_name = copy(name);
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sp->s_value = copy(val);
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}
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struct symtab *slookup(symbol, file)
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register char *symbol;
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register struct inclist *file;
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{
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register int first = 0;
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register int last = file->i_ndefs - 1;
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if (file) while (last >= first)
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{
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/* Fast inline binary search */
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register char *s1;
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register char *s2;
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register int middle = (first + last) / 2;
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/* Fast inline strchr() */
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s1 = symbol;
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s2 = file->i_defs[middle].s_name;
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while (*s1++ == *s2++)
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if (s2[-1] == '\0') break;
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/* If exact match, we're done */
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if (*--s1 == *--s2)
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{
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return file->i_defs + middle;
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}
|
|
|
|
/* If symbol > i_defs[middle] ... */
|
|
if (*s1 > *s2)
|
|
{
|
|
first = middle + 1;
|
|
}
|
|
/* else ... */
|
|
else
|
|
{
|
|
last = middle - 1;
|
|
}
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
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];
|
|
}
|
|
}
|