count() — internals

count() — internals

Where it lives

• Signature: src/builtins/array/count.rs
• Lowering: src/codegen/lower_inst/builtins.rs:1027 (lower_count)
• Function symbol: lower_count()

Lowering notes

• Lowers count(array) for concrete array values by reading the runtime length header.
• Called from crate::builtins::array::count (the registry home) via a thin wrapper.
• Handles Array/AssocArray (reads length directly from the runtime header), Mixed/Union
• (delegates to __rt_mixed_count), and Countable Object (calls the object’s count
• method via intrinsic or dynamic dispatch).

Runtime helpers

The following runtime helpers are referenced:

• __rt_mixed_count

Signature summary

function count(array $value, int $mode = 0): int

What the type checker enforces

• Arity: takes 1–2 arguments (1 optional).

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/array/count.rs (eval_builtin!)
• Dispatch hooks: direct, values

Cross-references

• User reference for count()