Not all of the memory on the machine, all of the C stack. It's a fixed-size piece of memory reserved for the the storage of the parameters and the local variables of C functions. Perl's guts and functions called via XS make use of this stack.

See the thread What perl operations will consume C stack space? and particularly hv's reply.

In reply to Re^5: safe untrusted regexp by ikegami
in thread safe untrusted regexp by jettero

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