Struct BoundaryCounters 

pub struct BoundaryCounters {
    pub strings_crossed: u64,
    pub bytes_copied: u64,
}

What crossed from JavaScript into the host, in bytes.

Every DOM binding that takes a string reaches dom::to_rust_string, and nothing else converts a JsValue into an owned Rust String on the way into the DOM. So one counter there accounts for the whole guest-to-host string traffic, which is the quantity a boundary design changes and a timing number cannot isolate.

Deliberately not interned, because Boa is not: a binding receives a JsString and copies it out on every call, so createElement("tr") pays for "tr" a thousand times in a thousand-row build. That repetition is the measurement, not an inefficiency in the counter.

Fields

strings_crossed: u64

Strings converted out of the JavaScript heap.

bytes_copied: u64

Their total length in UTF-8 bytes.

Trait Implementations

impl Clone for BoundaryCounters

fn clone(&self) -> BoundaryCounters

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BoundaryCounters

impl Debug for BoundaryCounters

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for BoundaryCounters

fn default() -> BoundaryCounters

Returns the “default value” for a type.

impl Eq for BoundaryCounters

impl PartialEq for BoundaryCounters

fn eq(&self, other: &BoundaryCounters) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BoundaryCounters