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From: Evan Zhao <tacingiht@gmail.com>
To: cocci@systeme.lip6.fr
Subject: [Cocci] A question about a part of a CTL formula
Date: Wed, 9 Jan 2019 16:02:10 +0800	[thread overview]
Message-ID: <CAAGQS2uda32aGO0vfPNUz8WGatfu8i0oM8dkf_aN9tsAUC1YLg@mail.gmail.com> (raw)

Hi there,

I am looking at a CTL formula generated by spatch with "--show-ctl-text",

for example, for a cocci file like
@@
expression e,e1,e2;
@@

if (e)
- GOTO(e1);
-else GOTO(e2);
+ e1;
+else e2;

it corresponding CTL formula is:

CTL =
Let _r_0 = (EX^((TrueBranch v InLoop)) v EX^(EX^(FalseBranch))) in
((_r_0 &
(Ex e1 .
((Ex_ e . (Ex _v . if (e) )) &,
((EX(FalseBranch) &, EX(After)) &,
((EX((TrueBranch &, AX((Ex _v . GOTO(e1);)))) &,
EX((FalseBranch &,
AX(((Ex _v . else ) &, AX((Ex e2 . (Ex _v . GOTO(e2);))))))))
&, EX((After &, EX((Ex _v . _S1)))))))))
v
(!_r_0 &
(Ex e1 .
((Ex_ e . if (e) ) &,
(EX(FalseBranch) &,
((EX((TrueBranch &, AX((Ex _v . GOTO(e1);)))) &,
EX((FalseBranch &,
AX(((Ex _v . else ) &, AX((Ex e2 . (Ex _v . GOTO(e2);))))))))
&, EX(After)))))))

and I noticed that
Let _r_0 = (EX^((TrueBranch v InLoop)) v EX^(EX^(FalseBranch))) in
is a fixed pattern, and I can track it at somewhere around the function of
do_between_dots in the module Asttoctl2, but I don't what it stands for.

Cloud someone tell me what purpose it serves for?
Thanks in advance.

Best regards,
Evan
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             reply	other threads:[~2019-01-09  8:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09  8:02 Evan Zhao [this message]
2019-01-09  8:06 ` [Cocci] A question about a part of a CTL formula Julia Lawall
2019-01-09  8:44   ` Evan Zhao
2019-01-09  8:50     ` Julia Lawall
2019-01-09  8:58       ` Evan Zhao

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