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Reference.org
Live-variable analysis
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<p>In <a href="/facts/Compilers/WNfCDFJe">compilers</a>, live variable analysis (or simply liveness analysis) is a classic <a href="/facts/Data-flow_analysis/jz2oI6sX">data-flow analysis</a> to calculate the <a href="/facts/Variable_(programming)/VoCKtwml">variables</a> that are <i>live</i> at each point in the program. A variable is <i>live</i> at some point if it holds a value that may be needed in the future, or equivalently if its value may be read before the next time the variable is written to. </p>