一个脚本引擎通常包括的组件有：符号表、词法分析器、语法分析器、语义检查器、中间代码生成器、代码优化器、代码生成器、虚拟机。
The script engine has some components, include symbol table, lexical analyzer, parser, semantic checker, intermediate code generator, optimizer, code generator, virtual machine.
现在，我们可以通过检查一些代码来查看GWT编译器是如何优化代码的。
Now we can take a look at some code to see how the GWT compiler optimizes it.
清单5给出的代码在优化了空基类的编译器上证明了这一点。
Listing 5 shows the code that proves the point on compilers optimizing empty base classes.
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