diff options
Diffstat (limited to 'recipes/linux/linux-2.6.18/kbuild-add-unifdef.patch')
| -rw-r--r-- | recipes/linux/linux-2.6.18/kbuild-add-unifdef.patch | 1020 |
1 files changed, 1020 insertions, 0 deletions
diff --git a/recipes/linux/linux-2.6.18/kbuild-add-unifdef.patch b/recipes/linux/linux-2.6.18/kbuild-add-unifdef.patch new file mode 100644 index 0000000000..78922a98af --- /dev/null +++ b/recipes/linux/linux-2.6.18/kbuild-add-unifdef.patch @@ -0,0 +1,1020 @@ +From 01f1c8799ad8b23c190d59cf1c9e28e6fed390a4 Mon Sep 17 00:00:00 2001 +From: Sam Ravnborg <sam@mars.ravnborg.org> +Date: Sun, 23 Jul 2006 20:39:59 +0200 +Subject: [PATCH] kbuild: add unifdef + +This patch contains a raw copy of unifdef.c +Next patch will modify it and add infrastructure to use it +Adding unifdef to the kernel is acked by the author. + +The reason to add unifdef as part of the kernel source is that it is not +yet a common utility on most distributions. + +Signed-off-by: Sam Ravnborg <sam@ravnborg.org> +--- + scripts/unifdef.c | 998 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 998 insertions(+) + +Index: linux-2.6.18-avr32/scripts/unifdef.c +=================================================================== +--- /dev/null 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.18-avr32/scripts/unifdef.c 2006-10-30 15:59:47.000000000 +0100 +@@ -0,0 +1,998 @@ ++/* ++ * Copyright (c) 2002 - 2005 Tony Finch <dot@dotat.at>. All rights reserved. ++ * ++ * This code is derived from software contributed to Berkeley by Dave Yost. ++ * It was rewritten to support ANSI C by Tony Finch. The original version of ++ * unifdef carried the following copyright notice. None of its code remains ++ * in this version (though some of the names remain). ++ * ++ * Copyright (c) 1985, 1993 ++ * The Regents of the University of California. All rights reserved. ++ * ++ * 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. ++ * ++ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. ++ */ ++ ++#include <sys/cdefs.h> ++ ++#ifndef lint ++#if 0 ++static const char copyright[] = ++"@(#) Copyright (c) 1985, 1993\n\ ++ The Regents of the University of California. All rights reserved.\n"; ++#endif ++#ifdef __IDSTRING ++__IDSTRING(Berkeley, "@(#)unifdef.c 8.1 (Berkeley) 6/6/93"); ++__IDSTRING(NetBSD, "$NetBSD: unifdef.c,v 1.8 2000/07/03 02:51:36 matt Exp $"); ++__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.171 2005/03/08 12:38:48 fanf2 Exp $"); ++#endif ++#endif /* not lint */ ++#ifdef __FBSDID ++__FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05/21 09:55:09 ru Exp $"); ++#endif ++ ++/* ++ * unifdef - remove ifdef'ed lines ++ * ++ * Wishlist: ++ * provide an option which will append the name of the ++ * appropriate symbol after #else's and #endif's ++ * provide an option which will check symbols after ++ * #else's and #endif's to see that they match their ++ * corresponding #ifdef or #ifndef ++ * ++ * The first two items above require better buffer handling, which would ++ * also make it possible to handle all "dodgy" directives correctly. ++ */ ++ ++#include <ctype.h> ++#include <err.h> ++#include <stdarg.h> ++#include <stdbool.h> ++#include <stdio.h> ++#include <stdlib.h> ++#include <string.h> ++#include <unistd.h> ++ ++size_t strlcpy(char *dst, const char *src, size_t siz); ++ ++/* types of input lines: */ ++typedef enum { ++ LT_TRUEI, /* a true #if with ignore flag */ ++ LT_FALSEI, /* a false #if with ignore flag */ ++ LT_IF, /* an unknown #if */ ++ LT_TRUE, /* a true #if */ ++ LT_FALSE, /* a false #if */ ++ LT_ELIF, /* an unknown #elif */ ++ LT_ELTRUE, /* a true #elif */ ++ LT_ELFALSE, /* a false #elif */ ++ LT_ELSE, /* #else */ ++ LT_ENDIF, /* #endif */ ++ LT_DODGY, /* flag: directive is not on one line */ ++ LT_DODGY_LAST = LT_DODGY + LT_ENDIF, ++ LT_PLAIN, /* ordinary line */ ++ LT_EOF, /* end of file */ ++ LT_COUNT ++} Linetype; ++ ++static char const * const linetype_name[] = { ++ "TRUEI", "FALSEI", "IF", "TRUE", "FALSE", ++ "ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF", ++ "DODGY TRUEI", "DODGY FALSEI", ++ "DODGY IF", "DODGY TRUE", "DODGY FALSE", ++ "DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE", ++ "DODGY ELSE", "DODGY ENDIF", ++ "PLAIN", "EOF" ++}; ++ ++/* state of #if processing */ ++typedef enum { ++ IS_OUTSIDE, ++ IS_FALSE_PREFIX, /* false #if followed by false #elifs */ ++ IS_TRUE_PREFIX, /* first non-false #(el)if is true */ ++ IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */ ++ IS_FALSE_MIDDLE, /* a false #elif after a pass state */ ++ IS_TRUE_MIDDLE, /* a true #elif after a pass state */ ++ IS_PASS_ELSE, /* an else after a pass state */ ++ IS_FALSE_ELSE, /* an else after a true state */ ++ IS_TRUE_ELSE, /* an else after only false states */ ++ IS_FALSE_TRAILER, /* #elifs after a true are false */ ++ IS_COUNT ++} Ifstate; ++ ++static char const * const ifstate_name[] = { ++ "OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX", ++ "PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE", ++ "PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE", ++ "FALSE_TRAILER" ++}; ++ ++/* state of comment parser */ ++typedef enum { ++ NO_COMMENT = false, /* outside a comment */ ++ C_COMMENT, /* in a comment like this one */ ++ CXX_COMMENT, /* between // and end of line */ ++ STARTING_COMMENT, /* just after slash-backslash-newline */ ++ FINISHING_COMMENT, /* star-backslash-newline in a C comment */ ++ CHAR_LITERAL, /* inside '' */ ++ STRING_LITERAL /* inside "" */ ++} Comment_state; ++ ++static char const * const comment_name[] = { ++ "NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING" ++}; ++ ++/* state of preprocessor line parser */ ++typedef enum { ++ LS_START, /* only space and comments on this line */ ++ LS_HASH, /* only space, comments, and a hash */ ++ LS_DIRTY /* this line can't be a preprocessor line */ ++} Line_state; ++ ++static char const * const linestate_name[] = { ++ "START", "HASH", "DIRTY" ++}; ++ ++/* ++ * Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1 ++ */ ++#define MAXDEPTH 64 /* maximum #if nesting */ ++#define MAXLINE 4096 /* maximum length of line */ ++#define MAXSYMS 4096 /* maximum number of symbols */ ++ ++/* ++ * Sometimes when editing a keyword the replacement text is longer, so ++ * we leave some space at the end of the tline buffer to accommodate this. ++ */ ++#define EDITSLOP 10 ++ ++/* ++ * Globals. ++ */ ++ ++static bool complement; /* -c: do the complement */ ++static bool debugging; /* -d: debugging reports */ ++static bool iocccok; /* -e: fewer IOCCC errors */ ++static bool killconsts; /* -k: eval constant #ifs */ ++static bool lnblank; /* -l: blank deleted lines */ ++static bool lnnum; /* -n: add #line directives */ ++static bool symlist; /* -s: output symbol list */ ++static bool text; /* -t: this is a text file */ ++ ++static const char *symname[MAXSYMS]; /* symbol name */ ++static const char *value[MAXSYMS]; /* -Dsym=value */ ++static bool ignore[MAXSYMS]; /* -iDsym or -iUsym */ ++static int nsyms; /* number of symbols */ ++ ++static FILE *input; /* input file pointer */ ++static const char *filename; /* input file name */ ++static int linenum; /* current line number */ ++ ++static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */ ++static char *keyword; /* used for editing #elif's */ ++ ++static Comment_state incomment; /* comment parser state */ ++static Line_state linestate; /* #if line parser state */ ++static Ifstate ifstate[MAXDEPTH]; /* #if processor state */ ++static bool ignoring[MAXDEPTH]; /* ignore comments state */ ++static int stifline[MAXDEPTH]; /* start of current #if */ ++static int depth; /* current #if nesting */ ++static int delcount; /* count of deleted lines */ ++static bool keepthis; /* don't delete constant #if */ ++ ++static int exitstat; /* program exit status */ ++ ++static void addsym(bool, bool, char *); ++static void debug(const char *, ...); ++static void done(void); ++static void error(const char *); ++static int findsym(const char *); ++static void flushline(bool); ++static Linetype getline(void); ++static Linetype ifeval(const char **); ++static void ignoreoff(void); ++static void ignoreon(void); ++static void keywordedit(const char *); ++static void nest(void); ++static void process(void); ++static const char *skipcomment(const char *); ++static const char *skipsym(const char *); ++static void state(Ifstate); ++static int strlcmp(const char *, const char *, size_t); ++static void unnest(void); ++static void usage(void); ++ ++#define endsym(c) (!isalpha((unsigned char)c) && !isdigit((unsigned char)c) && c != '_') ++ ++/* ++ * The main program. ++ */ ++int ++main(int argc, char *argv[]) ++{ ++ int opt; ++ ++ while ((opt = getopt(argc, argv, "i:D:U:I:cdeklnst")) != -1) ++ switch (opt) { ++ case 'i': /* treat stuff controlled by these symbols as text */ ++ /* ++ * For strict backwards-compatibility the U or D ++ * should be immediately after the -i but it doesn't ++ * matter much if we relax that requirement. ++ */ ++ opt = *optarg++; ++ if (opt == 'D') ++ addsym(true, true, optarg); ++ else if (opt == 'U') ++ addsym(true, false, optarg); ++ else ++ usage(); ++ break; ++ case 'D': /* define a symbol */ ++ addsym(false, true, optarg); ++ break; ++ case 'U': /* undef a symbol */ ++ addsym(false, false, optarg); ++ break; ++ case 'I': ++ /* no-op for compatibility with cpp */ ++ break; ++ case 'c': /* treat -D as -U and vice versa */ ++ complement = true; ++ break; ++ case 'd': ++ debugging = true; ++ break; ++ case 'e': /* fewer errors from dodgy lines */ ++ iocccok = true; ++ break; ++ case 'k': /* process constant #ifs */ ++ killconsts = true; ++ break; ++ case 'l': /* blank deleted lines instead of omitting them */ ++ lnblank = true; ++ break; ++ case 'n': /* add #line directive after deleted lines */ ++ lnnum = true; ++ break; ++ case 's': /* only output list of symbols that control #ifs */ ++ symlist = true; ++ break; ++ case 't': /* don't parse C comments */ ++ text = true; ++ break; ++ default: ++ usage(); ++ } ++ argc -= optind; ++ argv += optind; ++ if (argc > 1) { ++ errx(2, "can only do one file"); ++ } else if (argc == 1 && strcmp(*argv, "-") != 0) { ++ filename = *argv; ++ input = fopen(filename, "r"); ++ if (input == NULL) ++ err(2, "can't open %s", filename); ++ } else { ++ filename = "[stdin]"; ++ input = stdin; ++ } ++ process(); ++ abort(); /* bug */ ++} ++ ++static void ++usage(void) ++{ ++ fprintf(stderr, "usage: unifdef [-cdeklnst] [-Ipath]" ++ " [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n"); ++ exit(2); ++} ++ ++/* ++ * A state transition function alters the global #if processing state ++ * in a particular way. The table below is indexed by the current ++ * processing state and the type of the current line. ++ * ++ * Nesting is handled by keeping a stack of states; some transition ++ * functions increase or decrease the depth. They also maintain the ++ * ignore state on a stack. In some complicated cases they have to ++ * alter the preprocessor directive, as follows. ++ * ++ * When we have processed a group that starts off with a known-false ++ * #if/#elif sequence (which has therefore been deleted) followed by a ++ * #elif that we don't understand and therefore must keep, we edit the ++ * latter into a #if to keep the nesting correct. ++ * ++ * When we find a true #elif in a group, the following block will ++ * always be kept and the rest of the sequence after the next #elif or ++ * #else will be discarded. We edit the #elif into a #else and the ++ * following directive to #endif since this has the desired behaviour. ++ * ++ * "Dodgy" directives are split across multiple lines, the most common ++ * example being a multi-line comment hanging off the right of the ++ * directive. We can handle them correctly only if there is no change ++ * from printing to dropping (or vice versa) caused by that directive. ++ * If the directive is the first of a group we have a choice between ++ * failing with an error, or passing it through unchanged instead of ++ * evaluating it. The latter is not the default to avoid questions from ++ * users about unifdef unexpectedly leaving behind preprocessor directives. ++ */ ++typedef void state_fn(void); ++ ++/* report an error */ ++static void Eelif (void) { error("Inappropriate #elif"); } ++static void Eelse (void) { error("Inappropriate #else"); } ++static void Eendif(void) { error("Inappropriate #endif"); } ++static void Eeof (void) { error("Premature EOF"); } ++static void Eioccc(void) { error("Obfuscated preprocessor control line"); } ++/* plain line handling */ ++static void print (void) { flushline(true); } ++static void drop (void) { flushline(false); } ++/* output lacks group's start line */ ++static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); } ++static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); } ++static void Selse (void) { drop(); state(IS_TRUE_ELSE); } ++/* print/pass this block */ ++static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); } ++static void Pelse (void) { print(); state(IS_PASS_ELSE); } ++static void Pendif(void) { print(); unnest(); } ++/* discard this block */ ++static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); } ++static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); } ++static void Delse (void) { drop(); state(IS_FALSE_ELSE); } ++static void Dendif(void) { drop(); unnest(); } ++/* first line of group */ ++static void Fdrop (void) { nest(); Dfalse(); } ++static void Fpass (void) { nest(); Pelif(); } ++static void Ftrue (void) { nest(); Strue(); } ++static void Ffalse(void) { nest(); Sfalse(); } ++/* variable pedantry for obfuscated lines */ ++static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); } ++static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); } ++static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); } ++/* ignore comments in this block */ ++static void Idrop (void) { Fdrop(); ignoreon(); } ++static void Itrue (void) { Ftrue(); ignoreon(); } ++static void Ifalse(void) { Ffalse(); ignoreon(); } ++/* edit this line */ ++static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); } ++static void Mtrue (void) { keywordedit("else\n"); state(IS_TRUE_MIDDLE); } ++static void Melif (void) { keywordedit("endif\n"); state(IS_FALSE_TRAILER); } ++static void Melse (void) { keywordedit("endif\n"); state(IS_FALSE_ELSE); } ++ ++static state_fn * const trans_table[IS_COUNT][LT_COUNT] = { ++/* IS_OUTSIDE */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif, ++ print, done }, ++/* IS_FALSE_PREFIX */ ++{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif, ++ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc, ++ drop, Eeof }, ++/* IS_TRUE_PREFIX */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, ++ print, Eeof }, ++/* IS_PASS_MIDDLE */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif, ++ print, Eeof }, ++/* IS_FALSE_MIDDLE */ ++{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif, ++ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, ++ drop, Eeof }, ++/* IS_TRUE_MIDDLE */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif, ++ print, Eeof }, ++/* IS_PASS_ELSE */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif, ++ print, Eeof }, ++/* IS_FALSE_ELSE */ ++{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif, ++ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc, ++ drop, Eeof }, ++/* IS_TRUE_ELSE */ ++{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif, ++ Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc, ++ print, Eeof }, ++/* IS_FALSE_TRAILER */ ++{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif, ++ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc, ++ drop, Eeof } ++/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF ++ TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY) ++ PLAIN EOF */ ++}; ++ ++/* ++ * State machine utility functions ++ */ ++static void ++done(void) ++{ ++ if (incomment) ++ error("EOF in comment"); ++ exit(exitstat); ++} ++static void ++ignoreoff(void) ++{ ++ if (depth == 0) ++ abort(); /* bug */ ++ ignoring[depth] = ignoring[depth-1]; ++} ++static void ++ignoreon(void) ++{ ++ ignoring[depth] = true; ++} ++static void ++keywordedit(const char *replacement) ++{ ++ strlcpy(keyword, replacement, tline + sizeof(tline) - keyword); ++ print(); ++} ++static void ++nest(void) ++{ ++ depth += 1; ++ if (depth >= MAXDEPTH) ++ error("Too many levels of nesting"); ++ stifline[depth] = linenum; ++} ++static void ++unnest(void) ++{ ++ if (depth == 0) ++ abort(); /* bug */ ++ depth -= 1; ++} ++static void ++state(Ifstate is) ++{ ++ ifstate[depth] = is; ++} ++ ++/* ++ * Write a line to the output or not, according to command line options. ++ */ ++static void ++flushline(bool keep) ++{ ++ if (symlist) ++ return; ++ if (keep ^ complement) { ++ if (lnnum && delcount > 0) ++ printf("#line %d\n", linenum); ++ fputs(tline, stdout); ++ delcount = 0; ++ } else { ++ if (lnblank) ++ putc('\n', stdout); ++ exitstat = 1; ++ delcount += 1; ++ } ++} ++ ++/* ++ * The driver for the state machine. ++ */ ++static void ++process(void) ++{ ++ Linetype lineval; ++ ++ for (;;) { ++ linenum++; ++ lineval = getline(); ++ trans_table[ifstate[depth]][lineval](); ++ debug("process %s -> %s depth %d", ++ linetype_name[lineval], ++ ifstate_name[ifstate[depth]], depth); ++ } ++} ++ ++/* ++ * Parse a line and determine its type. We keep the preprocessor line ++ * parser state between calls in the global variable linestate, with ++ * help from skipcomment(). ++ */ ++static Linetype ++getline(void) ++{ ++ const char *cp; ++ int cursym; ++ int kwlen; ++ Linetype retval; ++ Comment_state wascomment; ++ ++ if (fgets(tline, MAXLINE, input) == NULL) ++ return (LT_EOF); ++ retval = LT_PLAIN; ++ wascomment = incomment; ++ cp = skipcomment(tline); ++ if (linestate == LS_START) { ++ if (*cp == '#') { ++ linestate = LS_HASH; ++ cp = skipcomment(cp + 1); ++ } else if (*cp != '\0') ++ linestate = LS_DIRTY; ++ } ++ if (!incomment && linestate == LS_HASH) { ++ keyword = tline + (cp - tline); ++ cp = skipsym(cp); ++ kwlen = cp - keyword; ++ /* no way can we deal with a continuation inside a keyword */ ++ if (strncmp(cp, "\\\n", 2) == 0) ++ Eioccc(); ++ if (strlcmp("ifdef", keyword, kwlen) == 0 || ++ strlcmp("ifndef", keyword, kwlen) == 0) { ++ cp = skipcomment(cp); ++ if ((cursym = findsym(cp)) < 0) ++ retval = LT_IF; ++ else { ++ retval = (keyword[2] == 'n') ++ ? LT_FALSE : LT_TRUE; ++ if (value[cursym] == NULL) ++ retval = (retval == LT_TRUE) ++ ? LT_FALSE : LT_TRUE; ++ if (ignore[cursym]) ++ retval = (retval == LT_TRUE) ++ ? LT_TRUEI : LT_FALSEI; ++ } ++ cp = skipsym(cp); ++ } else if (strlcmp("if", keyword, kwlen) == 0) ++ retval = ifeval(&cp); ++ else if (strlcmp("elif", keyword, kwlen) == 0) ++ retval = ifeval(&cp) - LT_IF + LT_ELIF; ++ else if (strlcmp("else", keyword, kwlen) == 0) ++ retval = LT_ELSE; ++ else if (strlcmp("endif", keyword, kwlen) == 0) ++ retval = LT_ENDIF; ++ else { ++ linestate = LS_DIRTY; ++ retval = LT_PLAIN; ++ } ++ cp = skipcomment(cp); ++ if (*cp != '\0') { ++ linestate = LS_DIRTY; ++ if (retval == LT_TRUE || retval == LT_FALSE || ++ retval == LT_TRUEI || retval == LT_FALSEI) ++ retval = LT_IF; ++ if (retval == LT_ELTRUE || retval == LT_ELFALSE) ++ retval = LT_ELIF; ++ } ++ if (retval != LT_PLAIN && (wascomment || incomment)) { ++ retval += LT_DODGY; ++ if (incomment) ++ linestate = LS_DIRTY; ++ } ++ /* skipcomment should have changed the state */ ++ if (linestate == LS_HASH) ++ abort(); /* bug */ ++ } ++ if (linestate == LS_DIRTY) { ++ while (*cp != '\0') ++ cp = skipcomment(cp + 1); ++ } ++ debug("parser %s comment %s line", ++ comment_name[incomment], linestate_name[linestate]); ++ return (retval); ++} ++ ++/* ++ * These are the binary operators that are supported by the expression ++ * evaluator. Note that if support for division is added then we also ++ * need short-circuiting booleans because of divide-by-zero. ++ */ ++static int op_lt(int a, int b) { return (a < b); } ++static int op_gt(int a, int b) { return (a > b); } ++static int op_le(int a, int b) { return (a <= b); } ++static int op_ge(int a, int b) { return (a >= b); } ++static int op_eq(int a, int b) { return (a == b); } ++static int op_ne(int a, int b) { return (a != b); } ++static int op_or(int a, int b) { return (a || b); } ++static int op_and(int a, int b) { return (a && b); } ++ ++/* ++ * An evaluation function takes three arguments, as follows: (1) a pointer to ++ * an element of the precedence table which lists the operators at the current ++ * level of precedence; (2) a pointer to an integer which will receive the ++ * value of the expression; and (3) a pointer to a char* that points to the ++ * expression to be evaluated and that is updated to the end of the expression ++ * when evaluation is complete. The function returns LT_FALSE if the value of ++ * the expression is zero, LT_TRUE if it is non-zero, or LT_IF if the ++ * expression could not be evaluated. ++ */ ++struct ops; ++ ++typedef Linetype eval_fn(const struct ops *, int *, const char **); ++ ++static eval_fn eval_table, eval_unary; ++ ++/* ++ * The precedence table. Expressions involving binary operators are evaluated ++ * in a table-driven way by eval_table. When it evaluates a subexpression it ++ * calls the inner function with its first argument pointing to the next ++ * element of the table. Innermost expressions have special non-table-driven ++ * handling. ++ */ ++static const struct ops { ++ eval_fn *inner; ++ struct op { ++ const char *str; ++ int (*fn)(int, int); ++ } op[5]; ++} eval_ops[] = { ++ { eval_table, { { "||", op_or } } }, ++ { eval_table, { { "&&", op_and } } }, ++ { eval_table, { { "==", op_eq }, ++ { "!=", op_ne } } }, ++ { eval_unary, { { "<=", op_le }, ++ { ">=", op_ge }, ++ { "<", op_lt }, ++ { ">", op_gt } } } ++}; ++ ++/* ++ * Function for evaluating the innermost parts of expressions, ++ * viz. !expr (expr) defined(symbol) symbol number ++ * We reset the keepthis flag when we find a non-constant subexpression. ++ */ ++static Linetype ++eval_unary(const struct ops *ops, int *valp, const char **cpp) ++{ ++ const char *cp; ++ char *ep; ++ int sym; ++ ++ cp = skipcomment(*cpp); ++ if (*cp == '!') { ++ debug("eval%d !", ops - eval_ops); ++ cp++; ++ if (eval_unary(ops, valp, &cp) == LT_IF) ++ return (LT_IF); ++ *valp = !*valp; ++ } else if (*cp == '(') { ++ cp++; ++ debug("eval%d (", ops - eval_ops); ++ if (eval_table(eval_ops, valp, &cp) == LT_IF) ++ return (LT_IF); ++ cp = skipcomment(cp); ++ if (*cp++ != ')') ++ return (LT_IF); ++ } else if (isdigit((unsigned char)*cp)) { ++ debug("eval%d number", ops - eval_ops); ++ *valp = strtol(cp, &ep, 0); ++ cp = skipsym(cp); ++ } else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) { ++ cp = skipcomment(cp+7); ++ debug("eval%d defined", ops - eval_ops); ++ if (*cp++ != '(') ++ return (LT_IF); ++ cp = skipcomment(cp); ++ sym = findsym(cp); ++ if (sym < 0) ++ return (LT_IF); ++ *valp = (value[sym] != NULL); ++ cp = skipsym(cp); ++ cp = skipcomment(cp); ++ if (*cp++ != ')') ++ return (LT_IF); ++ keepthis = false; ++ } else if (!endsym(*cp)) { ++ debug("eval%d symbol", ops - eval_ops); ++ sym = findsym(cp); ++ if (sym < 0) ++ return (LT_IF); ++ if (value[sym] == NULL) ++ *valp = 0; ++ else { ++ *valp = strtol(value[sym], &ep, 0); ++ if (*ep != '\0' || ep == value[sym]) ++ return (LT_IF); ++ } ++ cp = skipsym(cp); ++ keepthis = false; ++ } else { ++ debug("eval%d bad expr", ops - eval_ops); ++ return (LT_IF); ++ } ++ ++ *cpp = cp; ++ debug("eval%d = %d", ops - eval_ops, *valp); ++ return (*valp ? LT_TRUE : LT_FALSE); ++} ++ ++/* ++ * Table-driven evaluation of binary operators. ++ */ ++static Linetype ++eval_table(const struct ops *ops, int *valp, const char **cpp) ++{ ++ const struct op *op; ++ const char *cp; ++ int val; ++ ++ debug("eval%d", ops - eval_ops); ++ cp = *cpp; ++ if (ops->inner(ops+1, valp, &cp) == LT_IF) ++ return (LT_IF); ++ for (;;) { ++ cp = skipcomment(cp); ++ for (op = ops->op; op->str != NULL; op++) ++ if (strncmp(cp, op->str, strlen(op->str)) == 0) ++ break; ++ if (op->str == NULL) ++ break; ++ cp += strlen(op->str); ++ debug("eval%d %s", ops - eval_ops, op->str); ++ if (ops->inner(ops+1, &val, &cp) == LT_IF) ++ return (LT_IF); ++ *valp = op->fn(*valp, val); ++ } ++ ++ *cpp = cp; ++ debug("eval%d = %d", ops - eval_ops, *valp); ++ return (*valp ? LT_TRUE : LT_FALSE); ++} ++ ++/* ++ * Evaluate the expression on a #if or #elif line. If we can work out ++ * the result we return LT_TRUE or LT_FALSE accordingly, otherwise we ++ * return just a generic LT_IF. ++ */ ++static Linetype ++ifeval(const char **cpp) ++{ ++ int ret; ++ int val; ++ ++ debug("eval %s", *cpp); ++ keepthis = killconsts ? false : true; ++ ret = eval_table(eval_ops, &val, cpp); ++ debug("eval = %d", val); ++ return (keepthis ? LT_IF : ret); ++} ++ ++/* ++ * Skip over comments, strings, and character literals and stop at the ++ * next character position that is not whitespace. Between calls we keep ++ * the comment state in the global variable incomment, and we also adjust ++ * the global variable linestate when we see a newline. ++ * XXX: doesn't cope with the buffer splitting inside a state transition. ++ */ ++static const char * ++skipcomment(const char *cp) ++{ ++ if (text || ignoring[depth]) { ++ for (; isspace((unsigned char)*cp); cp++) ++ if (*cp == '\n') ++ linestate = LS_START; ++ return (cp); ++ } ++ while (*cp != '\0') ++ /* don't reset to LS_START after a line continuation */ ++ if (strncmp(cp, "\\\n", 2) == 0) ++ cp += 2; ++ else switch (incomment) { ++ case NO_COMMENT: ++ if (strncmp(cp, "/\\\n", 3) == 0) { ++ incomment = STARTING_COMMENT; ++ cp += 3; ++ } else if (strncmp(cp, "/*", 2) == 0) { ++ incomment = C_COMMENT; ++ cp += 2; ++ } else if (strncmp(cp, "//", 2) == 0) { ++ incomment = CXX_COMMENT; ++ cp += 2; ++ } else if (strncmp(cp, "\'", 1) == 0) { ++ incomment = CHAR_LITERAL; ++ linestate = LS_DIRTY; ++ cp += 1; ++ } else if (strncmp(cp, "\"", 1) == 0) { ++ incomment = STRING_LITERAL; ++ linestate = LS_DIRTY; ++ cp += 1; ++ } else if (strncmp(cp, "\n", 1) == 0) { ++ linestate = LS_START; ++ cp += 1; ++ } else if (strchr(" \t", *cp) != NULL) { ++ cp += 1; ++ } else ++ return (cp); ++ continue; ++ case CXX_COMMENT: ++ if (strncmp(cp, "\n", 1) == 0) { ++ incomment = NO_COMMENT; ++ linestate = LS_START; ++ } ++ cp += 1; ++ continue; ++ case CHAR_LITERAL: ++ case STRING_LITERAL: ++ if ((incomment == CHAR_LITERAL && cp[0] == '\'') || ++ (incomment == STRING_LITERAL && cp[0] == '\"')) { ++ incomment = NO_COMMENT; ++ cp += 1; ++ } else if (cp[0] == '\\') { ++ if (cp[1] == '\0') ++ cp += 1; ++ else ++ cp += 2; ++ } else if (strncmp(cp, "\n", 1) == 0) { ++ if (incomment == CHAR_LITERAL) ++ error("unterminated char literal"); ++ else ++ error("unterminated string literal"); ++ } else ++ cp += 1; ++ continue; ++ case C_COMMENT: ++ if (strncmp(cp, "*\\\n", 3) == 0) { ++ incomment = FINISHING_COMMENT; ++ cp += 3; ++ } else if (strncmp(cp, "*/", 2) == 0) { ++ incomment = NO_COMMENT; ++ cp += 2; ++ } else ++ cp += 1; ++ continue; ++ case STARTING_COMMENT: ++ if (*cp == '*') { ++ incomment = C_COMMENT; ++ cp += 1; ++ } else if (*cp == '/') { ++ incomment = CXX_COMMENT; ++ cp += 1; ++ } else { ++ incomment = NO_COMMENT; ++ linestate = LS_DIRTY; ++ } ++ continue; ++ case FINISHING_COMMENT: ++ if (*cp == '/') { ++ incomment = NO_COMMENT; ++ cp += 1; ++ } else ++ incomment = C_COMMENT; ++ continue; ++ default: ++ abort(); /* bug */ ++ } ++ return (cp); ++} ++ ++/* ++ * Skip over an identifier. ++ */ ++static const char * ++skipsym(const char *cp) ++{ ++ while (!endsym(*cp)) ++ ++cp; ++ return (cp); ++} ++ ++/* ++ * Look for the symbol in the symbol table. If is is found, we return ++ * the symbol table index, else we return -1. ++ */ ++static int ++findsym(const char *str) ++{ ++ const char *cp; ++ int symind; ++ ++ cp = skipsym(str); ++ if (cp == str) ++ return (-1); ++ if (symlist) { ++ printf("%.*s\n", (int)(cp-str), str); ++ /* we don't care about the value of the symbol */ ++ return (0); ++ } ++ for (symind = 0; symind < nsyms; ++symind) { ++ if (strlcmp(symname[symind], str, cp-str) == 0) { ++ debug("findsym %s %s", symname[symind], ++ value[symind] ? value[symind] : ""); ++ return (symind); ++ } ++ } ++ return (-1); ++} ++ ++/* ++ * Add a symbol to the symbol table. ++ */ ++static void ++addsym(bool ignorethis, bool definethis, char *sym) ++{ ++ int symind; ++ char *val; ++ ++ symind = findsym(sym); ++ if (symind < 0) { ++ if (nsyms >= MAXSYMS) ++ errx(2, "too many symbols"); ++ symind = nsyms++; ++ } ++ symname[symind] = sym; ++ ignore[symind] = ignorethis; ++ val = sym + (skipsym(sym) - sym); ++ if (definethis) { ++ if (*val == '=') { ++ value[symind] = val+1; ++ *val = '\0'; ++ } else if (*val == '\0') ++ value[symind] = ""; ++ else ++ usage(); ++ } else { ++ if (*val != '\0') ++ usage(); ++ value[symind] = NULL; ++ } ++} ++ ++/* ++ * Compare s with n characters of t. ++ * The same as strncmp() except that it checks that s[n] == '\0'. ++ */ ++static int ++strlcmp(const char *s, const char *t, size_t n) ++{ ++ while (n-- && *t != '\0') ++ if (*s != *t) ++ return ((unsigned char)*s - (unsigned char)*t); ++ else ++ ++s, ++t; ++ return ((unsigned char)*s); ++} ++ ++/* ++ * Diagnostics. ++ */ ++static void ++debug(const char *msg, ...) ++{ ++ va_list ap; ++ ++ if (debugging) { ++ va_start(ap, msg); ++ vwarnx(msg, ap); ++ va_end(ap); ++ } ++} ++ ++static void ++error(const char *msg) ++{ ++ if (depth == 0) ++ warnx("%s: %d: %s", filename, linenum, msg); ++ else ++ warnx("%s: %d: %s (#if line %d depth %d)", ++ filename, linenum, msg, stifline[depth], depth); ++ errx(2, "output may be truncated"); ++} |