UrForth/Beast uses Direct Threaded Code. each word has a prologue in native code, whose address is written into a threaded code stream. interpreter doesn't care if some word is a primitive, or something else; it simply jumps to the given address. there is still a CFA field, though, which is used by EXECUTE (and to determine word type). it's not strictly necessary, though, and i may get rid of it later.
the small twist to the usual DTC is that prologues consist of inlined machine code sequences, not of simple CALL/JMP. i'm not sure if this is better than a CALL with a common prologue, though: i'd simply wanted to try this approach. in the future i may create different UrF/B variants ("traditional" DTC, ITC), and check if they are really much slower. i may switch to some other scheme then.
note that the most of the code doesn't care about those details. i'd abstracted most of the low-level compiling and field manipulation into the corresponding words, so the code is (mostly) resistant to an article header format change.
also, there is one global hash table for all words. it is still fast: the code does 1 to 3 bucket checks (average number), and those checks are 2 aligned 32-bit values. actual name comparison is done only when the hash matches, which usually means that we found the right word. it is possible to get rid of names completely, as small change to hash function (extending it to 64 bits with a simple checksum) guarantees unique identifiers for any word (collision probability is so small that it can be safely ignored), but i need word names for the decompiler.
очередной фанатский фалаут? надоело. нахуй мне их постапокалиптика, у меня вокруг такой хуйни достаточно. лучше в какую-нибудь эроге играть, где основной смысл в девках с сиськами.
я должен… что? тренд «я много лет страдал, теперь восхищайтесь!» утомил. мне — как потребителю — совершенно поебать, сколько и как делали. про код мы не говорим, потому что проприетарная срань. а для игоря это неважно. такие дела.
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