Struct wasm::core::sidetable::SidetableEntry

pub struct SidetableEntry {
    pub delta_pc: isize,
    pub delta_stp: isize,
    pub valcnt: usize,
    pub popcnt: usize,
}

Entry to translate the current branches implicit target into an explicit offset to the instruction pointer, as well as the side table pointer

Each of the following constructs requires a SidetableEntry:

• br
• br_if
• br_table
• else

Fields

delta_pc: isize

Δpc: the amount to adjust the instruction pointer by if the branch is taken

delta_stp: isize

Δstp: the amount to adjust the side-table index by if the branch is taken

valcnt: usize

valcnt: the number of values that will be copied if the branch is taken

Branches may additionally consume operands themselves, which they push back on the operand stack after unwinding.

popcnt: usize

popcnt: the number of values that will be popped if the branch is taken

Taking a branch unwinds the operand stack down to the height where the targeted structured control instruction was entered.

Trait Implementations

impl Clone for SidetableEntry

fn clone(&self) -> SidetableEntry

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SidetableEntry

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

Formats the value using the given formatter.