MethodProxies

Just a little announce to mention that the library MethodProxies is available at
https://github.com/pharo-contributions/MethodProxies

MethodProxies is a Pharo instrumentation library for message-passing control. It lets you execute custom code before, after, instead of, or during the unwind of any method execution — without changing the method's source.

It is designed for building profilers, tracers, call-graph analyzers, mocks, and other dynamic analysis tools. Its stratified architecture cleanly separates the instrumentation mechanism (handled by the framework) from the user-defined behavior, so all you need to do is subclass a handler and define a few hooks.

MethodProxies guarantees:

• Meta-safety — instrumented methods can safely call other instrumented methods without triggering infinite recursion.
• Unwind-safety — non-local returns and exceptions are handled correctly.
• Meta-thread safety — the meta-level state is tracked per process.
• Dynamic (de)instrumentation — instrumentation can be installed and removed at run time.
• Practical overhead — the trap-method approach integrates with the JIT and with polymorphic inline caches.

And now we have a nice article
https://inria.hal.science/hal-05729849/file/main.pdf