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RFC 0004: HEAP escape analysis #4
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RFC 0004: HEAP escape analysis #4
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I think it might be possible to reuse a lot of the escape analysis architecture to implement a shadow stack for each fiber which contains only roots. This could be both precise and a far smaller stack than the actual program stack for the GC to scan. Especially given the stack usage will grow when escape analysis is turned on.
I don't know how that tradeoff compares to the LLVM built in stackmap generator, but it's an idea.