Struct rustc_session::code_stats::VTableSizeInfo

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pub struct VTableSizeInfo {
    pub trait_name: String,
    pub entries: usize,
    pub entries_ignoring_upcasting: usize,
    pub entries_for_upcasting: usize,
    pub upcasting_cost_percent: f64,
}

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§trait_name: String§entries: usize

Number of entries in a vtable with the current algorithm (i.e. with upcasting).

§entries_ignoring_upcasting: usize

Number of entries in a vtable, as-if we did not have trait upcasting.

§entries_for_upcasting: usize

Number of entries in a vtable needed solely for upcasting (i.e. entries - entries_ignoring_upcasting).

§upcasting_cost_percent: f64

Cost of having upcasting in % relative to the number of entries without upcasting (i.e. entries_for_upcasting / entries_ignoring_upcasting * 100%).

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 56 bytes