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SBCL Internals

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SAP stands for System Area Pointer. This is pretty simple - it's a primitive object with a header, containing an untyped C pointer which can point anywhere in memory (i.e. a SAP on the Alpha can represent any possible virtual address despite that Alpha SBCL is currently limited to the low 32 bits)

It chould be noted that (IIRC) within a single function the compiler is often tolerably smart about open-coding sap references so that the boxes never actually need consing.

This page is linked from: RANDOM-MT19937   x86-64  

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