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

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Date:	Fri, 20 Apr 2012 07:53:49 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	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

Em Thu, Apr 19, 2012 at 05:55:57PM -0600, David Ahern escreveu:
> On 4/19/12 2:33 PM, Arnaldo Carvalho de Melo wrote:
> >  		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.

Yeah, but we still want to do searches in the whole line, sure we could
do that using the name + operands parts, but I got lazy at that point.

- Arnaldo
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