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Guy Steele get to the point where you can actually read these technical papers and understand them Should you start at the beginning of the ACM and try to get up to the present Steele: Well, first of all, let me say that that exercise of reading through CACM from early on wasn t my plan to become a great computer scientist by reading everything there was in the literature. I read it because I was interested in stuff and felt internally motivated to tackle that particular set of material. So I guess there are two things: one is having the internal motivation to want to read this stuff because you re interested or because you think it will improve your skills. Then there is the problem of how do you find the good stuff And of course the view of what is the good stuff changes from decade to decade. Stuff that was considered the really good stuff this year may be kind of dated in ten years. But I guess you go to a mentor who s been through it and say, what do you think was the good stuff For me the good stuff was Knuth; Aho, Hopcroft, and Ullman. Gerald Weinberg on The Psychology of Computer Programming, which I think is still very readable today. Fred Brooks s Mythical Man-Month gave me some insights. In those days I haunted the computer-science book section of the MIT bookstore and just made a point of going through there once a month and browsing through the bookshelves. Of course now you walk into a bookstore and there s a computer section that s ten times as big, but most of it is about how to do C or Java this year. But there will be a smaller section of books about the theoretical background, algorithms, that kind of thing. Seibel: There s another kind of reading, which I know you think is important reading code. How do you find your way into a big pile of code you didn t write Steele: If it s a piece of software that I know how to use and just don t know how the insides work, I will often pick a particular command or interaction and trace it through. Seibel: The execution path
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Guy Steele Steele: Yes. So if I were walking up to Emacs, I d say, OK, let s take a look at the code that does forward a character . And I won t completely understand it but at least it ll introduce me to some data structures it uses and how the buffer is represented. And if I m lucky I can find a place where it adds one. And then once I ve understood that, then I ll try backwards a character. Kill a line. And work my way up through more and more complicated uses and interactions until I feel that I ve traced my way through some of the more important parts of the code. Seibel: And would tracing mean looking at the text of the source code and mentally executing it, or would you fire it up in a debugger and step through it Steele: I ve done it both ways I ve done it with a stepping debugger mostly on smaller codes back in the 70s or 80s. The problem nowadays is from the time a program first fires up until it begins to do anything interesting can already be a long initialization process. So perhaps one is better off trying to find the main command loop or the central control routine and then tracing from there. Seibel: And once you find that, would you set a break point and then step from there or just do it by mental execution Steele: I d be inclined to do it by desk-checking by actually reading the code and thinking about what it does. If I really need to understand the whole code then at some point I might sit down and try to read my way all the way through it. But you can t do that at first until you ve got some kind of framework in your head about how the thing is organized. Now, if you re lucky, the programmer actually left some documentation behind or named things well or left things in the right order in the file so you actually can sort of read it through. Seibel: So what is the right order in the file Steele: That s a very good question. It strikes me that one of the problems of a programming language like Pascal was that because it was designed for a one-pass compiler, the order of the routines in the file tended to be bottom-up because you had to define routines before you use them. As a result, the best way to read a Pascal program was actually backwards
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