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# JIT documentation

abstract:

When PyPy is translated into an executable such as `pypy-c`, the executable contains a full virtual machine that can optionally include a Just-In-Time compiler. This JIT compiler is generated automatically from the interpreter that we wrote in RPython.

This JIT Compiler Generator can be applied on interpreters for any language, as long as the interpreter itself is written in RPython and contains a few hints to guide the JIT Compiler Generator.

## Content

- Overview: motivating our approach
- Notes about the current work in PyPy
- Hooks debugging facilities available to a python programmer
- Virtualizable how virtualizables work and what they are (in other words how to make frames more efficient).

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