When modifying Flick in any way, the primary rule is to make new code look like the code that's already there. A corollary to the rule is this: do not reformat existing code. Keep the same declaration style, commenting style, indentation style, and so on as you write and modify code. Most any good, consistent coding style can be readable, but an inconsistent style creates Programmer's Hell. Gratuitous reformatting of existing code makes it difficult to tell from a diff what was actually changed and what is just cosmetic.
Comment the code. Source code is useless if people cannot understand it. Comment new code as you write it. Fix poorly commented code as you find it.
The result looks clean, even though it can be troublesome to edit afterwards. Avoid tricks; write portable code. Obvious code is best.
Treat compiler warnings as errors. Not only should your code compile on a variety of platforms with a variety of compilers, it should also compile without any warnings. A warning is a signal that something is wrong. A constant stream of warnings makes it too easy for new warnings to hide. Use C for general-purpose libraries. The functions in libcompiler are implemented in C for the same reason.
Maintain language consistency. However, it is confusing when a single component is implemented using both languages. When working on an existing component, use the language that is already in use for that component. When starting a new component, use the language that is common for components of that class.
Use the Flux Project coding style. The most obvious hallmark of this style is 8-character indentation stops -- chosen to make vi users happy. A second hallmark is that braces are "hung" after if , else , for , and switch. Braces are not hung, however, around the bodies of functions, structure type definitions, and so on.
In particular, this means that when "foreign" code is assimilated into Flick e. Use library routines as much as possible. In particular, avoid treating Flick's intermediate representation types e. As much as possible, use the appropriate library functions to manipulate IR nodes as abstract data types. This makes the code easier to read and maintain. This advice is somewhat idealistic. While it is generally straightforward to create nodes through a library interface, there is currently very little library support for accessing node data in any kind of abstract way.
Flick is written with the assumption that memory is plentiful, and this assumption is evident in two ways throughout the code. First, Flick makes frequent use of library routines that implement "allocate memory or panic" behavior see Section 9.
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Here are a few other important clarifications we wanted to highlight. Conclusion The TQA includes other clarifications and examples not covered in this article.
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