关于BSS解释

最新推荐文章于 2024-09-24 14:31:39 发布

linuxdog2

最新推荐文章于 2024-09-24 14:31:39 发布

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文章标签： fortran assembly arrays ibm object unix

本文链接：https://blog.youkuaiyun.com/bzhao/article/details/2007465

本文探讨了BSS（Block Started by Symbol）与BES（Block Ended by Symbol）两个伪操作符的含义及用途。Dennis Ritchie解释了它们在FAP（Fortran Assembly Program）中的作用，用于定义标签并预留存储空间。此外，还介绍了这些伪操作符在早期IBM计算机上的具体应用。

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关于BSS看大师是怎么说的：

bss = "Block Started by Symbol"        
        Dennis Ritchie says:
            Actually the acronym (in the sense we took it up; it may
            have other credible etymologies) is "Block Started by
            Symbol." It was a pseudo-op in FAP (Fortran Assembly [-er?]
            Program), an assembler for the IBM 704-709-7090-7094
            machines.  It defined its label and set aside space for a
            given number of words.  There was another pseudo-op, BES,
            "Block Ended by Symbol" that did the same except that the
            label was defined by the last assigned word + 1.  (On these
            machines Fortran arrays were stored backwards in storage
            and were 1-origin.)
            The usage is reasonably appropriate, because just as with
            standard Unix loaders, the space assigned didn't have to be
            punched literally into the object deck but was represented
            by a count somewhere.


是哪位总统接见Dennis Ritchie，并给他骑士勋章，因为他发明了C