boa_engine 0.21.1

Boa is a Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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use crate::{
    Context,
    vm::opcode::{Operation, VaryingOperand},
};

/// `GetArgument` implements the Opcode Operation for `Opcode::GetArgument`
///
/// Operation:
///  - Get i-th argument of the current frame.
#[derive(Debug, Clone, Copy)]
pub(crate) struct GetArgument;

impl GetArgument {
    #[inline(always)]
    pub(crate) fn operation((index, dst): (VaryingOperand, VaryingOperand), context: &mut Context) {
        let value = context
            .vm
            .stack
            .get_argument(context.vm.frame(), index.into())
            .cloned()
            .unwrap_or_default();
        context.vm.set_register(dst.into(), value);
    }
}

impl Operation for GetArgument {
    const NAME: &'static str = "GetArgument";
    const INSTRUCTION: &'static str = "INST - GetArgument";
    const COST: u8 = 2;
}