fprintf() — internals

fprintf() — internals

Where it lives

• Signature: src/builtins/io/fprintf.rs
• Lowering: src/codegen/lower_inst/builtins/io.rs:2860 (lower_fprintf)
• Function symbol: lower_fprintf()

Lowering notes

• Lowers fprintf(stream, format, values...) as sprintf() plus stream write.

Runtime helpers

The following runtime helpers are referenced:

• __rt_sprintf

Signature summary

function fprintf(resource $stream, string $format, ...$values): int

What the type checker enforces

• Arity: takes exactly 2 arguments.
• Variadic: collects excess arguments into $values.

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/filesystem/fprintf.rs (eval_builtin!)
• Dispatch hooks: direct, values
• Variadic: collects excess arguments into $values.

Cross-references

• User reference for fprintf()