Method emit

winch/codegen/src/codegen/control.rs:440–482

(
        &mut self,
        masm: &mut M,
        context: &mut CodeGenContext<Emission>,
    )

    }

    fn emit<M: MacroAssembler>(
        &mut self,
        masm: &mut M,
        context: &mut CodeGenContext<Emission>,
    ) -> Result<()> {
        use ControlStackFrame::*;

        // Do not perform any emissions if we are in an unreachable state.
        if !context.reachable {
            return Ok(());
        }

        match *self {
            If { cont, .. } => {
                // Pop the condition value.
                // Because in the case of Self::If, Self::init, will top the
                // branch params, we exclude any result registers from being
                // used as the branch test.
                let top = context.without::<Result<TypedReg>, _, _>(
                    self.params::<M>()?.regs(),
                    masm,
                    |cx, masm| cx.pop_to_reg(masm, None),
                )??;
                self.init(masm, context)?;
                masm.branch(
                    IntCmpKind::Eq,
                    top.reg,
                    top.reg.into(),
                    cont,
                    OperandSize::S32,
                )?;
                context.free_reg(top);
                Ok(())
            }
            Block { .. } => self.init(masm, context),
            Loop { head, .. } => {
                self.init(masm, context)?;
                masm.bind(head)?;
                Ok(())
            }
            _ => Err(format_err!(CodeGenError::if_control_frame_expected())),
        }
    }

    /// Handles the else branch if the current control stack frame is
    /// [`ControlStackFrame::If`].