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Date: Fri, 12 Jan 2018 12:04:38 +0100
From: Ulf Magnusson <ulfalizer@...il.com>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Sam Ravnborg <sam@...nborg.org>,
"Luis R . Rodriguez" <mcgrof@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kconfig: use default 'yy' prefix for lexer and parser
On Fri, Jan 12, 2018 at 1:58 AM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> Flex and Bison provide an option to change the prefix of globally-
> visible symbols. This is useful to link multiple lexers and/or
> parsers into the same executable. However, Kconfig (and any other
> host programs in kernel) uses a single lexer and parser. I do not
> see a good reason to change the default 'yy' prefix.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
> scripts/kconfig/Makefile | 3 ---
> scripts/kconfig/zconf.l | 16 ++++++++--------
> scripts/kconfig/zconf.y | 22 +++++++++++-----------
> 3 files changed, 19 insertions(+), 22 deletions(-)
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index 61cdc5e..2ad1cf5 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -211,9 +211,6 @@ HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(srctree)/$(src)/check.sh $(HOSTCC)
> HOSTCFLAGS_zconf.lex.o := -I$(src)
> HOSTCFLAGS_zconf.tab.o := -I$(src)
>
> -LEX_PREFIX_zconf := zconf
> -YACC_PREFIX_zconf := zconf
> -
> HOSTLOADLIBES_qconf = $(KC_QT_LIBS)
> HOSTCXXFLAGS_qconf.o = $(KC_QT_CFLAGS)
>
> diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
> index c410d25..07e074d 100644
> --- a/scripts/kconfig/zconf.l
> +++ b/scripts/kconfig/zconf.l
> @@ -106,11 +106,11 @@ n [A-Za-z0-9_-]
> current_pos.file = current_file;
> current_pos.lineno = current_file->lineno;
> if (id && id->flags & TF_COMMAND) {
> - zconflval.id = id;
> + yylval.id = id;
> return id->token;
> }
> alloc_string(yytext, yyleng);
> - zconflval.string = text;
> + yylval.string = text;
> return T_WORD;
> }
> . warn_ignored_character(*yytext);
> @@ -142,11 +142,11 @@ n [A-Za-z0-9_-]
> ({n}|[/.])+ {
> const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
> if (id && id->flags & TF_PARAM) {
> - zconflval.id = id;
> + yylval.id = id;
> return id->token;
> }
> alloc_string(yytext, yyleng);
> - zconflval.string = text;
> + yylval.string = text;
> return T_WORD;
> }
> #.* /* comment */
> @@ -161,7 +161,7 @@ n [A-Za-z0-9_-]
> <STRING>{
> [^'"\\\n]+/\n {
> append_string(yytext, yyleng);
> - zconflval.string = text;
> + yylval.string = text;
> return T_WORD_QUOTE;
> }
> [^'"\\\n]+ {
> @@ -169,7 +169,7 @@ n [A-Za-z0-9_-]
> }
> \\.?/\n {
> append_string(yytext + 1, yyleng - 1);
> - zconflval.string = text;
> + yylval.string = text;
> return T_WORD_QUOTE;
> }
> \\.? {
> @@ -178,7 +178,7 @@ n [A-Za-z0-9_-]
> \'|\" {
> if (str == yytext[0]) {
> BEGIN(PARAM);
> - zconflval.string = text;
> + yylval.string = text;
> return T_WORD_QUOTE;
> } else
> append_string(yytext, 1);
> @@ -261,7 +261,7 @@ void zconf_starthelp(void)
>
> static void zconf_endhelp(void)
> {
> - zconflval.string = text;
> + yylval.string = text;
> BEGIN(INITIAL);
> }
>
> diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
> index 600deb1..dd0c09d 100644
> --- a/scripts/kconfig/zconf.y
> +++ b/scripts/kconfig/zconf.y
> @@ -20,10 +20,10 @@
>
> int cdebug = PRINTD;
>
> -extern int zconflex(void);
> +int yylex(void);
> +static void yyerror(const char *err);
> static void zconfprint(const char *err, ...);
> static void zconf_error(const char *err, ...);
> -static void zconferror(const char *err);
> static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtoken);
>
> struct symbol *symbol_hash[SYMBOL_HASHSIZE];
> @@ -529,9 +529,9 @@ void conf_parse(const char *name)
> _menu_init();
>
> if (getenv("ZCONF_DEBUG"))
> - zconfdebug = 1;
> - zconfparse();
> - if (zconfnerrs)
> + yydebug = 1;
> + yyparse();
> + if (yynerrs)
> exit(1);
> if (!modules_sym)
> modules_sym = sym_find( "n" );
> @@ -544,9 +544,9 @@ void conf_parse(const char *name)
> menu_finalize(&rootmenu);
> for_all_symbols(i, sym) {
> if (sym_check_deps(sym))
> - zconfnerrs++;
> + yynerrs++;
> }
> - if (zconfnerrs)
> + if (yynerrs)
> exit(1);
> sym_set_change_count(1);
> }
> @@ -571,7 +571,7 @@ static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtok
> if (id->token != endtoken) {
> zconf_error("unexpected '%s' within %s block",
> id->name, zconf_tokenname(starttoken));
> - zconfnerrs++;
> + yynerrs++;
> return false;
> }
> if (current_menu->file != current_file) {
> @@ -580,7 +580,7 @@ static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int endtok
> fprintf(stderr, "%s:%d: location of the '%s'\n",
> current_menu->file->name, current_menu->lineno,
> zconf_tokenname(starttoken));
> - zconfnerrs++;
> + yynerrs++;
> return false;
> }
> return true;
> @@ -601,7 +601,7 @@ static void zconf_error(const char *err, ...)
> {
> va_list ap;
>
> - zconfnerrs++;
> + yynerrs++;
> fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
> va_start(ap, err);
> vfprintf(stderr, err, ap);
> @@ -609,7 +609,7 @@ static void zconf_error(const char *err, ...)
> fprintf(stderr, "\n");
> }
>
> -static void zconferror(const char *err)
> +static void yyerror(const char *err)
> {
> fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
> }
> --
> 2.7.4
>
Looks good to me. Less cryptic.
Acked-by: Ulf Magnusson <ulfalizer@...il.com>
Cheers,
Ulf
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