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Tom Lord <lord@xxxxxxx> writes: > This hypothesis, that you're making a mistake, is reinforced by an > experiment that jivera (Matthew Dempsky) carried out. He thought: > "Suppose I have a Scheme implementation that uses a > Sperber/Kelsey-style FFI. And further suppose that I now want that > implementation to have a Pika-style FFI. How hard is that?" About > 2-3 pages of trivial code later, and disregarding for the moment > the issues we haven't taken up yet about error handling and > non-local exits, he had 95% of an implementation. The only > sticking point was on the exact syntax of GCPROtect-family macros: > it would take some tweaks to reconcile those in Pika with those in > the draft. We would need to make a trivial addition to the Pika > macros to complete the job. For those interested: http://www.flame.org/~jivera/pika/srfi-50.h Regarding the current SCM_PROTECT_FRAME macro, even gcc without any compiler optimization flags is able to use constant folding to reduce the switch case to just a single function call for common cases of having a fixed number of local variables. (I haven't actually worked with S48 or SCSH's FFI so I don't know that it works -- I wrote it entirely based on what I could understand from the draft SRFI.) -jivera