Method evalConst

compiler_expr.go:2433–2466

(expr compiledExpr)

}

func (c *compiler) evalConst(expr compiledExpr) (Value, *Exception) {
	if expr, ok := expr.(*compiledLiteral); ok {
		return expr.val, nil
	}
	if c.evalVM == nil {
		c.evalVM = New().vm
	}
	var savedPrg *Program
	createdPrg := false
	if c.evalVM.prg == nil {
		c.evalVM.prg = &Program{
			src: c.p.src,
		}
		savedPrg = c.p
		c.p = c.evalVM.prg
		createdPrg = true
	}
	savedPc := len(c.p.code)
	expr.emitGetter(true)
	c.evalVM.pc = savedPc
	ex := c.evalVM.runTry()
	if createdPrg {
		c.evalVM.prg = nil
		c.evalVM.pc = 0
		c.p = savedPrg
	} else {
		c.evalVM.prg.code = c.evalVM.prg.code[:savedPc]
		c.p.code = c.evalVM.prg.code
	}
	if ex == nil {
		return c.evalVM.pop(), nil
	}
	return nil, ex
}

func (e *compiledUnaryExpr) constant() bool {
	return e.operand.constant()