From: Josh Triplett <josh@joshtriplett.org>
To: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
Cc: Chris Forbes <chrisf@ijw.co.nz>, linux-sparse@vger.kernel.org
Subject: Re: [PATCH 1/3] evaluate: warn on identical exprs around '&&'
Date: Mon, 29 Aug 2011 03:25:01 -0700 [thread overview]
Message-ID: <20110829102501.GA22825@leaf> (raw)
In-Reply-To: <20110829100106.GE15022@debian.debian>
On Mon, Aug 29, 2011 at 12:01:06PM +0200, Jonathan Neuschäfer wrote:
> On Sun, Aug 28, 2011 at 03:14:18PM +1200, Chris Forbes wrote:
> > + case EXPR_BINOP:
> > + case EXPR_COMMA:
> > + case EXPR_COMPARE:
> > + case EXPR_LOGICAL:
> > + case EXPR_ASSIGNMENT:
> > + return expr_equiv(lhs->left, rhs->left) &&
> > + expr_equiv(lhs->right, rhs->right);
> [...]
> > + if ((a == b) && (a == b)) /* should warn */
> > + bar();
> > +
> > + if ((a == b) && (b == c)) /* should not warn */
> > + bar();
>
> Should it maybe also handle cases like this?
>
> if ((a == b) && (b == a))
> bar();
That seems both significantly harder to handle and significantly less
likely (since it won't occur due to simple copy/paste). Probably worth
doing at some point, but I don't think a first pass needs to consider
it.
- Josh Triplett
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next prev parent reply other threads:[~2011-08-29 10:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-28 3:14 [PATCH 1/3] evaluate: warn on identical exprs around '&&' Chris Forbes
2011-08-28 3:14 ` [PATCH 2/3] evaluate: warn on identical exprs around '||' Chris Forbes
2011-08-28 3:14 ` [PATCH 3/3] evaluate: warn on identical exprs on ?: Chris Forbes
2011-08-29 10:01 ` [PATCH 1/3] evaluate: warn on identical exprs around '&&' Jonathan Neuschäfer
2011-08-29 10:25 ` Josh Triplett [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-08-27 22:26 Chris Forbes
2011-08-28 2:50 ` Josh Triplett
2011-08-28 2:53 ` Chris Forbes
2011-08-28 3:33 ` Josh Triplett
2011-08-28 2:57 ` Chris Forbes
2011-08-28 3:36 ` Josh Triplett
2011-08-31 0:24 ` Christopher Li
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