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comptime VM: extern slice/string args (-> NUL-term char*) + float guards (Phase 4D.2)

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Extract marshalExternArg: a scalar/pointer word passes verbatim (a cstring arg
already works as a pointer word via 4D.1); a string/slice {ptr,len} fat pointer is
copied into a NUL-terminated arena buffer and its char* passed -- mirrors the legacy
marshalExternArg, and is what the bundler's popen(cmd: [:0]u8, ...) needs.

Add float guards on args AND returns: floats are kindOf == .word but the host_ffi
trampolines have no float variant, so bail loudly rather than miscall through an
integer register (the legacy interp doesn't support float FFI either -> parity).

New example 0637-comptime-extern-slice-arg (#run strlen("hello, world") with a
[:0]u8 param -> 12) runs HANDLED on the VM, byte-matching legacy. 699/0 both gates.
The FFI escape now covers scalar/pointer/cstring/slice args + scalar/pointer returns.
This commit is contained in:
agra
2026-06-18 18:09:46 +03:00
parent e7a8708287
commit 6a7f6902b8
6 changed files with 60 additions and 4 deletions
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len=12