feat(r8): Support rewriteFrames annotation in ProguardCache

[romtsn]

Closes #63

• Store rewrite rules in ProguardCache format
• Decode rewrite rules and use them for symbolication
• Additionally parse the exception descriptor
• Make new methods public to be consumed in symbolicator later on

See linked issue for more details.

[loewenheim]

You also need to consider how you're going to use this from Symbolicator, since you won't be able to just use remap_stacktrace. My suggestion would be to move some of the logic into remap_frame.

[romtsn]

You also need to consider how you're going to use this from Symbolicator, since you won't be able to just use remap_stacktrace. My suggestion would be to move some of the logic into remap_frame.

@loewenheim I have attempted to consolidate the logic under remap_frame and extend the custom iterator to account for skip functionality. Let me know if this is overly-complicated or looks good -- I can probably apply the same for the Mapper (although not sure if it's necessary since it's not being reused in symbolicator like the Cache?). Here's the relevant symbolicator PR with the caller side usage getsentry/symbolicator#1845

[loewenheim]

@romtsn The logic is good. However, I would suggest leaving remap_frame the way it was and adding your version as a new method. That way, this only requires a minor update. I agree with you that it should be fine to not do this (now) for the mapper.

[romtsn]

However, I would suggest leaving remap_frame the way it was and adding your version as a new method. That way, this only requires a minor update.

thanks, this makes sense! I will move it over to a new method