Michael Gottesman ba9946a131 Add a dumper/verifier for OpaqueExistentialContainers (i.e. Any) in c++. ...

The dumper method dumps:

1. The container's metadata pointer.
2. A pointer to the container's value.
3. Whether or not said value is stored inline in the container.

This provides a general overview that can be used even when working with SIL
code in the debugger by grabbing a pointer to swift Anys and then calling the
c++ any method upon them.

The verifier is intended to be used in conjunction with ASAN for maximum
effect to catch use-after-frees of existential boxes.

While implementing this I refactored some code from ExistentialTypeMetadata into
methods on OpaqueExistentialContainer. ExistentialTypeMetadata just calls these
methods now instead of implementing the code inline.

2018-02-23 23:03:55 -08:00

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