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最新推荐文章于 2025-08-08 17:00:29 发布

Lu_ming

最新推荐文章于 2025-08-08 17:00:29 发布

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文章标签： library variables binding list

本文链接：https://blog.youkuaiyun.com/Lu_ming/article/details/4354055

本文探讨了在宏展开过程中不同库之间的依赖关系及其在编译与运行时的不同需求。解释了如何区分宏展开阶段与运行阶段对于库的需求，并讨论了这两种阶段所需信息的区别。

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Expanding a library may require run-time information from another library. For example, if a macro transformer
calls a procedure from library A, then the library A must be instantiated before expanding any use of the macro in
library B. Library A may not be needed when library B is eventually run as part of a program, or it may be needed for
run time of library B, too. The library mechanism distinguishes these times by phases.

Every library can be characterized by expand-time information (minimally, its imported libraries, a list of the exported
keywords, a list of the exported variables, and code to evalute the transformer expressions) and run-time information
(minimally, code to evaluate the variable definition right-hand-side expressions, and code to evaluate the body expression).
The expand-time information must be available to expand references to any exported binding, and the run-time information
must be available to evaluate references to any exported variable binding.