hrtime() — internals

hrtime() — internals

Where it lives

• Signature: src/builtins/system/hrtime.rs
• Lowering: src/codegen/lower_inst/builtins/system.rs:247 (lower_hrtime)
• Function symbol: lower_hrtime()

Lowering notes

• Lowers hrtime([$as_number]) through the monotonic-clock runtime helper.
• __rt_hrtime reads the as-number flag from the integer result register (x0/rax) and returns
• an already-boxed Mixed result — a boxed [sec, nsec] array when the flag is 0/false, or a
• boxed nanosecond integer when truthy — so no post-call boxing is needed. Unlike the timestamp
• builtins the omitted-argument default is 0 (array form), not the -1 current-time sentinel.

Runtime helpers

The following runtime helpers are referenced:

• __rt_hrtime
• __rt_http_response_code

Signature summary

function hrtime(bool $as_number = false): mixed

What the type checker enforces

• Arity: takes 0–1 arguments (1 optional).

Eval interpreter (magician)

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

Cross-references

• User reference for hrtime()