bugLiberty Eiffel - Bugs: bug #47905, LE generates 'unreachabel code'...


bug #47905: LE generates 'unreachabel code' for 'and-then' statements

Submitted by:  Hans Zwakenberg <hzwakenberg>
Submitted on:  Thu 12 May 2016 07:00:00 AM UTC  
Category:  Liberty tools Severity:  3 - Normal
Priority:  5 - Normal Status:  Confirmed
Assigned to:  None Open/Closed:  Open
Release:  bell Fixed Release:  None
Planned Release:  None

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Thu 12 May 2016 07:00:00 AM UTC, original submission:  

Continuing my experiments with Pelles-C, I noticed that a lot of the code that it flags as 'unreachable code' is generated for Eiffel 'and then' statements, especially so when multiple of them are chained together..

Despite doing global analysis when in boost-mode, Liberty cannot or does not determine, that an 'and then' condition can never happen and generates unneeded code for it.

Just a single example of the many in the current (May 11, 2016) germ:   compile_to_c8.c, lines 1079, 1081, 1082, 1177, 1179, 1180, 1543, 1545, 1546.
As noted, Pelles-C flags many more of these (currently) 135 c-files with the same warning message.

Hans Zwakenberg <hzwakenberg>


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    Date Changed by Updated Field Previous Value => Replaced by
    2018-07-31 hzwakenberg StatusNone => Confirmed

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