Crate cranelift_control

Cranelift Control

This is the home of the control plane of chaos mode, a compilation feature intended to be turned on for certain fuzz targets. When the feature is turned off, as is normally the case, ControlPlane will be a zero-sized type and optimized away.

While the feature is turned on, the struct ControlPlane provides functionality to tap into pseudo-randomness at specific locations in the code. It may be used for targeted fuzzing of compiler internals, e.g. manipulate heuristic optimizations, clobber undefined register bits etc.

There are two ways to acquire a ControlPlane:

• arbitrary for the real deal
• default for an “empty” control plane which always returns default values

Structs

• ControlPlane
  A shim for ControlPlane when chaos mode is disabled. Please see the crate-level documentation.