Module unwind 

Unwinding runtime for Miri.

The core pieces of the runtime are:

• An implementation of catch_unwind that pushes the invoked stack frame with some extra metadata derived from the panic-catching arguments of catch_unwind.
• A hack in libpanic_unwind that calls the miri_start_unwind intrinsic instead of the target-native panic runtime. (This lives in the rustc repo.)
• An implementation of miri_start_unwind that stores its argument (the panic payload), and then immediately returns, but on the unwind edge (not the normal return edge), thus initiating unwinding.
• A hook executed each time a frame is popped, such that if the frame pushed by catch_unwind gets popped during unwinding, we take the panic payload and store it according to the extra metadata we remembered when pushing said frame.

Structs

CatchUnwindData

Holds all of the relevant data for when unwinding hits a try frame.

Traits

EvalContextExt