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char * e r r s [ ] = { "Permission denied", /* Eperm */ "I/O e r r o r " , /* E i o */ " F i l e does n o t e x i s t " , /* E f i l e */ "Memory l i m i t reached", /* E e */ mm "Out o f f i l e space", /* Espace */ " I t ' s a l l Greg's f a u l t " /* Egreg */
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There are a couple of benefits to this approach First, the relationship between the
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enum values and the strings they represent is literally self-documenting and easy to
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make natural-language independent Also, the information appears only once, a "single point of truth" from which other code is generated, so there is only one place to keep information up to date If instead there are multiple places, it is inevitable that they will get out of sync sometime Finally, it's easy to arrange that the c file will be recreated and recompiled whenever the header file is changed When an error message must be changed, all that is needed is to modify the header file and compile the operating system The messages are automatically updated The generator program can be written in any language A string processing language like Per1 makes it easy:
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SECTION 95
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PROGRAMS THAT WRITE PROGRAMS
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# enumpl: generate e r r o r s t r i n g s from enum+comments
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p r i n t "/* machine-generated; do not e d i t */\n\nW; p r i n t "char * e r r s [ ] = {\nW; w h i l e (o) { chop; i f (/A\s*(E[a-z0-9]+), $name = $1; S/ *\/\* *// ; remove newline f i r s t word i s E save name remove up t o /* remove */ $name */\nW;
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# # # # #
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*\*\///;
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p r i n t "\t\"$-\",
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p r i n t "};\nn;
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Regular expressions are in action again Lines whose first fields look like identifiers followed by a comma are selected The first substitution deletes everything up to the first non-blank character of the comment, while the second removes the comment terminator and any blanks that precede it As part of a compiler-testing effort, Andy Koenig developed a convenient way to write C++ code to check that the compiler caught program errors Code fragments that should cause a compiler diagnostic are decorated with magic comments to describe the expected messages Each line has a comment that begins with /// (to distinguish it from ordinary comments) and a regular expression that matches the diagnostics from that line Thus, for example, the following two code fragments should generate diagnostics:
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f0 {I /// warning * non-void f u n c t i o n
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{ r e t u r n 1;)
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should r e t u r n a value
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void g()
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/// e r r o r * void f u n c t i o n may n o t r e t u r n a value
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If we run the second test through our C++ compiler, it prints the expected message, which matches the regular expression:
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% CC x c " x - c " , l i n e 1: error(321):
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Each such code fragment is given to the compiler, and the output is compared against the expected diagnostics, a process that is managed by a combination of shell and Awk programs Failures indicate a test where the compiler output differed from what was expected Because the comments are regular expressions there is some latitude in the output; they can be made more or less forgiving, depending on what is needed The idea of comments with semantics is not new They appear in Postscript, where regular comments begin with % Comments that begin with %% by convention may carry extra information about page numbers, bounding boxes, font names, and the like:
%%PageBoundingBox: 126 307 492 768 %%Pages: 14 %%DocumentFonts: Helveti ca Times-Ital i c Times-Roman Luci daSans-Typewri t e r In Java, comments that begin with /** and end with */ are used to create documentation for the class definition that follows The large-scale version of self-documenting code is literate programming, which integrates a program and its documentation so one process prints it in a natural order for reading, and another arranges it in the right order for compilation In all of the examples above, it is important to observe the role of notation, the mixture of languages, and the use of tools The combination magnifies the power of the individual components
Exercise 9-15 One of the old chestnuts of computing is to write a program that when executed will reproduce itself exactly, in source form This is a neat special case of a program that writes a program Give it a try in some of your favorite languages