printf() — internals

printf() — internals

Where it lives

• Signature: src/builtins/string/printf.rs
• Lowering: src/codegen/lower_inst/builtins/strings.rs:579 (lower_printf)
• Function symbol: lower_printf()

Lowering notes

• Lowers printf(format, values...) as sprintf() followed by stdout emission.

Runtime helpers

The following runtime helpers are referenced:

• __rt_sprintf

Signature summary

function printf(string $format, ...$values): int

What the type checker enforces

• Arity: takes exactly 1 argument.
• Variadic: collects excess arguments into $values.

Eval interpreter (magician)

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

Cross-references

• User reference for printf()