2020-04-22 21:19:12 -04:00
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STACK OVERFLOW PROTECTION: To avoid having to check for stack
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underflow after each pop operation (which can end up being
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2020-05-11 21:08:24 -04:00
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prohibitive in terms of costs), PS_ADDR should be set to
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at least 6 bytes before its actual limit. 6 bytes because we
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seldom have words requiring more than 3 items from the stack.
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Then, at each "exit" call we check for stack underflow.
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