• Damien George's avatar
    py: Turn down amount of RAM parser and compiler use. · 66e18f04
    Damien George authored
    There are 2 locations in parser, and 1 in compiler, where memory
    allocation is not precise.  In the parser it's the rule stack and result
    stack, in the compiler it's the array for the identifiers in the current
    scope.  All other mallocs are exact (ie they don't allocate more than is
    This patch adds tuning options (MP_ALLOC_*) to mpconfig.h for these 3
    inexact allocations.
    The inexact allocations in the parser should actually be close to
    logarithmic: you need an exponentially larger script (absent pathological
    cases) to use up more room on the rule and result stacks.  As such, the
    default allocation policy for these is now to start with a modest sized
    stack, but grow only in small increments.
    For the identifier arrays in the compiler, these now start out quite
    small (4 entries, since most functions don't have that many ids), and
    grow incrementally by 6 (since if you have more ids than 4, you probably
    have quite a few more, but it wouldn't be exponentially more).
    Partially addresses issue #560.