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comptime VM: general host-FFI escape — call any extern libc fn via dlsym + host_ffi (Phase 4D.1)

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Replace the "extern not ported -> bail" stub in Vm.invoke with callHostExtern:
resolve the symbol via host_ffi.lookupSymbol (dlsym RTLD_DEFAULT) and dispatch
through the host_ffi trampolines, like the legacy interp.callExtern.

Marshalling is trivial now that Addr is a real host pointer (4D.0): every WORD-kind
arg passes as usize verbatim (a scalar's bits OR a pointer, no translation), and a
pointer return is a valid Addr. Picks callPtrRet (void*-ABI) for pointer-ish
returns, callIntRet (i64-ABI) otherwise; honors variadic. Non-word
(aggregate/string/float) args+returns bail loudly (4D.2 adds them). One general
mechanism for all externs, not per-builtin special cases.

New example 0636-comptime-extern-libc (#run toupper(97)/tolower(90) -> 65/122) runs
HANDLED on the VM, output byte-matching legacy. 698/0 both gates.
This commit is contained in:
agra
2026-06-18 18:00:07 +03:00
parent 625ba0fb27
commit e7a8708287
6 changed files with 106 additions and 3 deletions
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toupper(97)=65 tolower(90)=122