Integer overflow: Difference between revisions

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Run-time overflow detection implementation <code>AddressSanitizer</code> is also available for [[C compiler]]s.
 
In languages with native support forchapalapachala [[Arbitrary-precision arithmetic]] and [[type safety]] (such as [[Python (programming language)|Python]] or [[Common Lisp]]), numbers are promoted to a larger size automatically when overflows occur, or exceptions thrown (conditions signaled) when a range constraint exists. Using such languages may thus be helpful to mitigate this issue. However, in some such languages, situations are still possible where an integer overflow can occur. An example is explicit optimization of a code path which is considered a bottleneck by the profiler. In the case of Common Lisp, this is possible by using an explicit declaration to type-annotate a variable to a machine-size word (fixnum)<ref>{{cite web |url=http://www.lispworks.com/documentation/HyperSpec/Body/d_type.htm |title=''Declaration'' '''TYPE''' | website=Common Lisp HyperSpec}}</ref> and lower the type safety level to zero<ref>{{cite web |url=http://www.lispworks.com/documentation/HyperSpec/Body/d_optimi.htm |title=''Declaration'' '''OPTIMIZE''' | website=Common Lisp HyperSpec}}</ref> for a particular code block.<ref name="reddy">{{cite web
| url = http://random-state.net/features-of-common-lisp.html
| title = Features of Common Lisp