February 9th, 2012 | 
Author: Understanding The Concept Of Unreachable Codes
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An unreachable code refers to those sections in the source code of any web based development concerns which can never be reached or get bypassed by the control flow paths of the program.
A code gets unreachable due to Conditional statements whose complexity amounts to digression of path. Unreachable codes at times also get formed during optimization of the source codes. It occurs in rare cases when the web developer has not removed those parts which were once useful for the websites development while coding but now serves no purpose.
Disadvantages of unreachable codes
As these codes could never be executed they serve no contribution to the output of the program. Therefore they have numerous disadvantages namely
- The unreachable codes occupy precious space in the memory.
- The CPU stores these instructions as cache. These codes therefore decrease the data locality needed for searching the components of the program.
- Unnecessary time and energy would be spent in maintaining a code that is no longer usable.
Comparison with dead codes
Both dead codes and unreachable codes never contribute to the output of the program and are undesirable from the view of a professional website development . They differ in the sense that while unreachable codes are never reached to be executed. The dead codes on the other hand are always reached and executed but the result afterwards execution is of no importance to the websites development programs. To counter this redundancy the unreachable codes should at once be eliminated.
How to eliminate the unreachable codes
The optimization technique which removes unreachable codes is called dead code elimination. It is essentially a form of static code analysis where errors are trapped at compilation stage of the source codes during development of website.
This is done by performing control flow analysis on the codes to find those codes which are never executed during the compilation of the program. After these codes are detected they are at once removed from the source codes which help to improve the efficiency of any professional website development.
About the writer:nbsp;nbsp;I am the webmaster at www.synapsewebsolutions.co.uk a websites development offering quality and costefficient offshore website design and development solutions.
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