Most just-in-time compilers for object-oriented languages operate at the granularity of methods. Unfortunately, even hot methods often contain cold code paths. As a consequence, just-in-time compilers waste time compiling code that will be executed only rarely, if at all. This dissertation explores an alternative approach in which only truly hot code paths are ever compiled. As a result, our technique compiles significantly less code and improves the performance of both statically and dynamically typed programming languages.
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