linux-kernel - Re: [PATCH 02/13] perf annotate: Parse instruction

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Date:	Thu, 19 Apr 2012 17:55:57 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 02/13] perf annotate: Parse instruction

On 4/19/12 2:33 PM, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo<acme@...hat.com>
>
> For lines with instructions find the name and operands, breaking those
> tokens for consumption by the browser.
>
> Cc: David Ahern<dsahern@...il.com>
> Cc: Frederic Weisbecker<fweisbec@...il.com>
> Cc: Mike Galbraith<efault@....de>
> Cc: Namhyung Kim<namhyung@...il.com>
> Cc: Paul Mackerras<paulus@...ba.org>
> Cc: Peter Zijlstra<peterz@...radead.org>
> Cc: Stephane Eranian<eranian@...gle.com>
> Link: http://lkml.kernel.org/n/tip-6aazb9f5o3d9zi28e6rruv12@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo<acme@...hat.com>
> ---
>   tools/perf/util/annotate.c |   65 +++++++++++++++++++++++++++++++++++++++++++-
>   tools/perf/util/annotate.h |    3 ++
>   2 files changed, 67 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index ef1d57d..a72585a 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -80,16 +80,50 @@ int symbol__inc_addr_samples(struct symbol *sym, struct map *map,
>
>   static struct disasm_line *disasm_line__new(s64 offset, char *line, size_t privsize)
>   {
> -	struct disasm_line *dl = malloc(sizeof(*dl) + privsize);
> +	struct disasm_line *dl = zalloc(sizeof(*dl) + privsize);
>
>   	if (dl != NULL) {
>   		dl->offset = offset;
>   		dl->line = strdup(line);
>   		if (dl->line == NULL)
>   			goto out_delete;
> +
> +		if (offset != -1) {
> +			char *name = dl->line, tmp;
> +
> +			while (isspace(name[0]))
> +				++name;
> +
> +			if (name[0] == '\0')
> +				goto out_delete;
> +
> +			dl->operands = name + 1;
> +
> +			while (dl->operands[0] != '\0'&&
> +			       !isspace(dl->operands[0]))
> +				++dl->operands;
> +
> +			tmp = dl->operands[0];
> +			dl->operands[0] = '\0';
> +			dl->name = strdup(name);

This strdup seems unnecessary. The parsing seems to be:

dl->line = "\W*name\W*operands"
    dl->name = -^    ^- = dl_operands

so name and operands are 2 different parts of the same buffer.

David
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