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Enter, Leave, Tailcall Hooks Part 1: The Basics

The CLR Profiling API allows you to hook managed functions so that your profiler is called when a function is entered, returns, or exits via tailcall. We refer to these as Enter/Leave/Tailcall hooks, or “ELT” hooks. In this special multi-part investigative series, I will uncover the truth behind ELT. Today I'll write about some of the basics, NGEN, and a word on what we call "slow-path" vs. "fast-path".


Setting up the hooks

1.     On initialization, your







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