scriptc

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Chris Tate 3bcf761f42 Throw a catchable RangeError on deep recursion

Native executables used to terminate with a signal when recursion
exhausted the stack. Functions that can take part in unbounded recursion
now compare the stack pointer against a per-stack guard on entry and
throw Node's `RangeError: Maximum call stack size exceeded` through the
ordinary exception path, so catch handlers, finally blocks, worker error
events and the uncaught-error exit code behave as they do under Node.

- The checked set is every function on a cycle of the call graph, where
  operations that can reenter compiled code indirectly (indirect calls,
  callbacks, dynamic and library operations) reach closure targets and
  class members. Non-recursive functions, including leaf callbacks, stay
  check-free, and the may-throw analysis accounts for the new throw.
- The runtime installs the guard per context (main thread from the stack
  rlimit, workers from their thread attributes) and per async fiber, with
  a reserve for the throw, unwinding and error reporting. Worker threads
  now get an explicit 8 MiB stack.
- Scalar call results pass through the unwind path as its dummy value, so
  calls in tail position keep tail-call and recursion elimination.

2026-10-09 16:55:35 -05:00