linux-kernel - Re: [PATCH 1/5] perf annotate: Refactor the code to parse disassemble lines with {l,r}trim()

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Date:   Sat, 8 Apr 2017 09:12:28 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 1/5] perf annotate: Refactor the code to parse disassemble
 lines with {l,r}trim()



On 04/08/2017 12:04 AM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Apr 07, 2017 at 11:24:17PM +0900, Taeung Song escreveu:
>> When parsing disassemble lines,
>> use ltrim() and rtrim() to strip them,
>> not using just while loop and isspace().
>>
>> Cc: Jiri Olsa <jolsa@...nel.org>
>> Cc: Namhyung Kim <namhyung@...nel.org>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>> ---
>>  tools/perf/util/annotate.c | 49 ++++++++++------------------------------------
>>  1 file changed, 10 insertions(+), 39 deletions(-)
>>
>> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
>> index a37032b..1b4f17b 100644
>> --- a/tools/perf/util/annotate.c
>> +++ b/tools/perf/util/annotate.c
>> @@ -379,9 +379,7 @@ static int mov__parse(struct arch *arch, struct ins_operands *ops, struct map *m
>>  	if (comment == NULL)
>>  		return 0;
>>
>> -	while (comment[0] != '\0' && isspace(comment[0]))
>> -		++comment;
>> -
>> +	comment = ltrim(comment);
>>  	comment__symbol(ops->source.raw, comment, &ops->source.addr, &ops->source.name);
>>  	comment__symbol(ops->target.raw, comment, &ops->target.addr, &ops->target.name);
>>
>> @@ -426,9 +424,7 @@ static int dec__parse(struct arch *arch __maybe_unused, struct ins_operands *ops
>>  	if (comment == NULL)
>>  		return 0;
>>
>> -	while (comment[0] != '\0' && isspace(comment[0]))
>> -		++comment;
>> -
>> +	comment = ltrim(comment);
>>  	comment__symbol(ops->target.raw, comment, &ops->target.addr, &ops->target.name);
>>
>>  	return 0;
>> @@ -777,10 +773,7 @@ static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, str
>>
>>  static int disasm_line__parse(char *line, const char **namep, char **rawp)
>>  {
>> -	char *name = line, tmp;
>> -
>> -	while (isspace(name[0]))
>> -		++name;
>> +	char tmp, *name = ltrim(line);
>>
>>  	if (name[0] == '\0')
>>  		return -1;
>> @@ -798,12 +791,7 @@ static int disasm_line__parse(char *line, const char **namep, char **rawp)
>>  		goto out_free_name;
>>
>>  	(*rawp)[0] = tmp;
>> -
>> -	if ((*rawp)[0] != '\0') {
>> -		(*rawp)++;
>> -		while (isspace((*rawp)[0]))
>> -			++(*rawp);
>> -	}
>> +	*rawp = ltrim(*rawp);
>>
>>  	return 0;
>>
>> @@ -1148,9 +1136,9 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
>>  {
>>  	struct annotation *notes = symbol__annotation(sym);
>>  	struct disasm_line *dl;
>> -	char *line = NULL, *parsed_line, *tmp, *tmp2, *c;
>> +	char *line = NULL, *parsed_line, *tmp, *tmp2;
>>  	size_t line_len;
>> -	s64 line_ip, offset = -1;
>> +	s64 line_ip = -1, offset = -1;
>>  	regmatch_t match[2];
>>
>>  	if (getline(&line, &line_len, file) < 0)
>> @@ -1159,32 +1147,15 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
>>  	if (!line)
>>  		return -1;
>>
>> -	while (line_len != 0 && isspace(line[line_len - 1]))
>> -		line[--line_len] = '\0';
>> -
>> -	c = strchr(line, '\n');
>> -	if (c)
>> -		*c = 0;
>> -
>> -	line_ip = -1;
>> -	parsed_line = line;
>> +	parsed_line = rtrim(line);
>>
>>  	/* /filename:linenr ? Save line number and ignore. */
>> -	if (regexec(&file_lineno, line, 2, match, 0) == 0) {
>> -		*line_nr = atoi(line + match[1].rm_so);
>> +	if (regexec(&file_lineno, parsed_line, 2, match, 0) == 0) {
>> +		*line_nr = atoi(parsed_line + match[1].rm_so);
>
> Both should be the same, so this is further noise in the patch, please
> refrain from doing extra things in a patch. If you feel this is really
> needed, do it in _another_ patch, with proper explanation.
>
> This is a trivial case, but you need to be consistent, avoiding to lump
> together unrelated stuff in the same patch.

Thank you for detailed advice!
will do as you comment.

  - Taeung

>
>>  		return 0;
>>  	}
>>
>> -	/*
>> -	 * Strip leading spaces:
>> -	 */
>> -	tmp = line;
>> -	while (*tmp) {
>> -		if (*tmp != ' ')
>> -			break;
>> -		tmp++;
>> -	}
>> -
>> +	tmp = ltrim(parsed_line);
>>  	if (*tmp) {
>>  		/*
>>  		 * Parse hexa addresses followed by ':'
>> --
>> 2.7.4