scriptc

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Chris Tate d1e7f9088c Give async bodies and generators 512 KiB stacks

Async functions and generators run on their own fiber stacks. The new
stack-overflow guard keeps a quarter of each stack as a reserve for
unwinding and error reporting, which cut the depth they could recurse to
from 256 KiB to 192 KiB of frames. Moderately deep recursion inside an
async body or generator then threw RangeError where Node runs it, for
example 3000 frames of an unoptimized build on arm64 macOS.

Fibers now get 512 KiB, which leaves 384 KiB after the reserve. Pages are
still committed lazily, so idle and shallow fibers cost address space, not
memory. The corpus pins recursion inside async functions and generators
next to deeper recursion on the main stack.

2026-10-09 17:33:59 -05:00