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JIT Inspector


The JIT inspector instruments generated JavaScript JIT code to record information about how much code has run and how well it was optimized:

- How many times individual operations have been executed.
- Whether operations executed entirely in JIT code (fast) or as calls into the underlying virtual machine (slow).
- Precision of type information inferred for each operation, as used for optimization.

To open the JIT Inspector, go to Tools -> Web Developer -> JIT Inspector. Then, "Start Profiling" and "Stop Profiling" control whether all executing JavaScript code is profiled, and the display pane allows browsing and inspection of the profiled code.

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