ABI. The binary contract: register widths, stack layout, struct padding, symbol names. Not the same as a source API. Mojo Int64 and C long can match on this Mac and still be different types in the source.
abi("C"). Mojo effect that makes a function use the platform C calling convention. The compiler describes that value as thin.
BEAM. The Erlang virtual machine that executes Elixir. beam.smp is the executable that exports enif_* and dlopens NIFs.
calloc. libc allocator that returns zeroed memory. nif_init uses it because Mojo 1.1.0 has no module-level variable. Those two blocks stay until the process exits. Mojoler.Own uses free on its private box in unload. enif_free is a different allocator.
Dirty scheduler. A BEAM scheduler reserved for NIFs that set ERL_NIF_DIRTY_JOB_CPU_BOUND (1) or ERL_NIF_DIRTY_JOB_IO_BOUND (2) in ErlNifFunc.flags. add sets 0.
Dynamic loader. dyld on this Mac, ld.so on Linux. It maps the .so and binds undefined symbols. Two-level namespace on Darwin does not bind NIF symbols to beam.smp unless the library was linked with -undefined dynamic_lookup.
enif_get_int64. A macro for enif_get_long in this OTP because SIZEOF_LONG is 8. Not a symbol you can import.
ErlNifEntry. The struct nif_init returns. 96 bytes in erts 16.2 on this Mac. See 05-otp-abi-map.md.
ErlNifEnv. Opaque VM handle passed to each NIF call. Valid for that call. Not stored by this NIF.
ErlNifFunc. One exported NIF function: name, arity, code pointer, flags. 32 bytes here.
ERL_NIF_TERM. Unsigned integer the width of a pointer. 8 bytes here. Not a Mojo pointer.
Immediate / boxed term. How the VM packs small integers versus heap objects inside an ERL_NIF_TERM. This NIF does not inspect the tag. enif_get_long does.
LLVM. The compiler IR mojo build --emit llvm writes. The small add lowers to add i64. MLIR is an earlier stage this CLI did not print.
Mach-O. macOS object-file format. file reports Mach-O 64-bit dynamically linked shared library arm64. ELF is the Linux counterpart. The Ubuntu runner produced it: nm printed T mojoler_add with no leading underscore (E18).
MutUntrackedOrigin. A Mojo origin that opts out of lifetime checking. Used for VM pointers and calloc memory. It is a promise, not a check.
NIF. Native Implemented Function. Erlang loads a shared library and calls C-ABI functions with the NIF API.
nif_init. The symbol a dynamically loaded NIF must export. Returns ErlNifEntry*. On Darwin, nm prints _nif_init.
Origin. Compile-time provenance of a Mojo pointer. ImmStaticOrigin is the origin of a string literal. Origins are not bytes in the struct.
Owner. The single Mojo variable that owns a value. When its lifetime ends, Mojo destroys the value. See ownership.md.
Transfer (^). Moves ownership to a new name. The source is uninitialized afterward.
Lifecycle. Construction in __init__(out self), use, then destruction in __deinit__(deinit self) at the last use.
OTP. Open Telecom Platform, the Erlang distribution. Version 28.3.1, emulator erts 16.2.
Reduction. VM accounting unit for Erlang work. NIFs do not automatically consume reductions.
Resource. A VM-managed object with a destructor. Stage 0 did not allocate one. Stage 3 does, in Mojoler.Own. The init struct is still 40 bytes, and that size is stored in the entry as a version tag. The BEAM term is a handle. Elixir code never receives the native pointer.
Borrowed view. A pointer from enif_inspect_binary that is valid only for the callback. borrow_len and borrow_stable read it and then free the descriptor. They do not return the pointer.
Fingerprint. The sha256 scripts/fingerprint.sh prints. The Mix compiler skips mojo build when that line still matches priv/native/FINGERPRINT and the libraries are present.
rpath. A Mach-O load command that says where to find @rpath/... dependencies. This NIF's rpath points at the project venv's modular/lib.
Scheduler. An OS thread that runs Erlang processes. A normal NIF runs on the scheduler that called it.
Symbol. A named address in an object file. T in nm is a global defined text symbol. t is a local one. U is undefined.
Thin function. Mojo's term for a C function pointer with no captured environment. Eight bytes on this target.
vm_variant. String in the entry that must match the running emulator. "beam.vanilla" in this header.