[Backtracing] Add a caching wrapper for MemoryReader. #69611
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…s active. There's no need for fatalError() to try to generate its own backtraces when the runtime's backtracer is enabled. Not only is the code it uses more fragile but it also doesn't support async or inline frames and it can't look-up symbols properly either. rdar://117470489
The Runtime/backtrace test is a test of the fatalError() backtracer, which gets turned off when we have the new backtracer enabled. So, to make this test work, we need to turn off the new backtracer. rdar://117470489
al45tair
added
🍒 release cherry pick
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Explanation: Adds a |
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@swift-ci Please test |
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Oops. Messed up and confused two PRs. |
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Currently we read many small chunks from the process we're backtracing. If it so happens that it's the local process, that isn't really a big problem, but if it's a remote process, especially on Linux where we have to use the memory server, it's probably a little slow.
Fix by adding a caching layer.
rdar://117681625