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

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Message-ID: <20170407150130.GC2966@kernel.org>
Date:   Fri, 7 Apr 2017 12:01:30 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...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()

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;

Try to avoid doing these unrelated changes, i.e. moving the setting of
line_ip to -1 from down below to here.

It is unrelated to what you're doing here, i.e. using ltrim/rtrim, and
requires looking at the code to see if this can be done, as I don't know
if line_ip is set to something else in-between... I am removing this,
leaving the patch just for rtrim/ltrim.

>  	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);
>  		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