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kconfig: use yylineno option instead of manual lineno increments 

Tracking the line number by hand is error-prone since you need to
increment it in every \n matching pattern.

If '%option yylineno' is set, flex defines 'yylineno' to contain the
current line number and automatically updates it each time it reads a
\n character.  This is much more convenient although the lexer does
not initializes yylineno, so you need to set it to 1 each time you
start reading a new file, and restore it you go back to the previous
file.

I tested this with DEBUG_PARSE, and confirmed the same dump message
was produced.

I removed the perf-report option.  Otherwise, I see the following
message:
  %option yylineno entails a performance penalty ONLY on rules that
  can match newline characters

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2018-03-23 02:00:14 +09:00
parent 379a8eb8eb
commit 18492685e4
2 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
scripts/kconfig/lkc.h
View File

@ -68,6 +68,7 @@ struct kconf_id {
enum symbol_type stype;
};
extern int yylineno;
void zconfdump(FILE *out);
void zconf_starthelp(void);
FILE *zconf_fopen(const char *name);

20
scripts/kconfig/zconf.l
View File

@ -1,5 +1,5 @@
%option nostdinit noyywrap never-interactive full ecs
%option 8bit nodefault perf-report perf-report
%option 8bit nodefault yylineno
%option noinput
%x COMMAND HELP STRING PARAM
%{
@ -83,7 +83,6 @@ n [A-Za-z0-9_-]
[ \t]*#.*\n |
[ \t]*\n {
current_file->lineno++;
return T_EOL;
}
[ \t]*#.*
@ -104,7 +103,7 @@ n [A-Za-z0-9_-]
const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
BEGIN(PARAM);
current_pos.file = current_file;
current_pos.lineno = current_file->lineno;
current_pos.lineno = yylineno;
if (id && id->flags & TF_COMMAND) {
yylval.id = id;
return id->token;
@ -116,7 +115,6 @@ n [A-Za-z0-9_-]
. warn_ignored_character(*yytext);
\n {
BEGIN(INITIAL);
current_file->lineno++;
return T_EOL;
}
}
@ -138,7 +136,7 @@ n [A-Za-z0-9_-]
new_string();
BEGIN(STRING);
}
\n BEGIN(INITIAL); current_file->lineno++; return T_EOL;
\n BEGIN(INITIAL); return T_EOL;
({n}|[/.])+ {
const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
if (id && id->flags & TF_PARAM) {
@ -150,7 +148,7 @@ n [A-Za-z0-9_-]
return T_WORD;
}
#.* /* comment */
\\\n current_file->lineno++;
\\\n ;
[[:blank:]]+
. warn_ignored_character(*yytext);
<<EOF>> {
@ -187,7 +185,6 @@ n [A-Za-z0-9_-]
fprintf(stderr,
"%s:%d:warning: multi-line strings not supported\n",
zconf_curname(), zconf_lineno());
current_file->lineno++;
BEGIN(INITIAL);
return T_EOL;
}
@ -220,12 +217,10 @@ n [A-Za-z0-9_-]
}
}
[ \t]*\n/[^ \t\n] {
current_file->lineno++;
zconf_endhelp();
return T_HELPTEXT;
}
[ \t]*\n {
current_file->lineno++;
append_string("\n", 1);
}
[^ \t\n].* {
@ -304,7 +299,7 @@ void zconf_initscan(const char *name)
memset(current_buf, 0, sizeof(*current_buf));
current_file = file_lookup(name);
current_file->lineno = 1;
yylineno = 1;
}
void zconf_nextfile(const char *name)
@ -325,6 +320,7 @@ void zconf_nextfile(const char *name)
buf->parent = current_buf;
current_buf = buf;
current_file->lineno = yylineno;
file->parent = current_file;
for (iter = current_file; iter; iter = iter->parent) {
@ -343,7 +339,7 @@ void zconf_nextfile(const char *name)
}
}
file->lineno = 1;
yylineno = 1;
current_file = file;
}
@ -352,6 +348,8 @@ static void zconf_endfile(void)
struct buffer *parent;
current_file = current_file->parent;
if (current_file)
yylineno = current_file->lineno;
parent = current_buf->parent;
if (parent) {