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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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the opening and closing comment markers placed on separate lines. Listing 3-24 illustrates these concepts. Listing 3-24. Comment Placement and Spacing Examples if (return_value) { int var1; long var2;
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/* comment goes here */ /* comment goes here too */
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/* this call does something else based on i */ var1= do_something_else(i); if (var1) { /* This comment explains some really interesting thing about the following statement(s). */ do_it_again(); } }
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Tip Never use repeating *s to emphasize portions of code. It distracts the reader from the code and makes for a cluttered look. Besides, it s too much work to get all those things to line up especially when you edit your comments later.
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If you are modifying the MySQL source code using the source control application BitKeeper, you don t have to worry about tracking your changes. BitKeeper provides several ways in which you can detect and report on which changes are yours versus others. However, if you are not using BitKeeper, you could lose track of which changes are yours, particularly if you make changes directly to existing system functions. In this case, it becomes difficult to distinguish what you wrote from what was already there. Keeping an engineering logbook helps immensely with this problem, but there is a better way. You could add comments before and after your changes to indicate which lines of code are your modifications. For example, you could place a comment like /* BEGIN CAB MODIFICATION */ before the code and a comment like /* END CAB MODIFICATION */ after the code. This allows you to bracket your changes and helps you search for the changes easily using a number of text and line parsing utilities. An example of this technique is shown in Listing 3-25.
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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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Listing 3-25. Commenting Your Changes to the MySQL Source Code /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds my revision note to the MySQL version number. */ /* original code: */ /*strmov(end, "."); */ strmov(end, "-CAB Modifications"); /* END CAB MODIFICATION */ Notice I have also included the reason for the modification and the commented-out lines of the original code (the example is fictional). Using this technique will help you quickly access your changes and enhance your ability to diagnose problems later. This technique can also be helpful if you make modifications for use in your organization and you are not going to share the changes with MySQL AB. If you do not share the changes, you will be forced to make the modifications to the source code every time MySQL AB releases a new build of the system you want to use. Having comment markers in the source code will help you quickly identify which files need changes and what those changes are. Chances are that if you create some new functionality you will eventually want to share that functionality if for no other reason than to avoid making the modifications every time a new version of MySQL is released.
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Caution Although this technique isn t prohibited when using source code under configuration control
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(BitKeeper), it is usually discouraged. In fact, developers may later remove your comments altogether. Use this technique when you make changes that you are not going to share with anyone.
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Building the System for the First Time
Now that you ve seen the inner workings of the MySQL source code and followed the path of a typical query through the source code, it is time for you to take a turn at the wheel. If you are already working with the MySQL source code and you are reading this book to learn more about the source code and how to modify it, you can skip this section. I recommend, before you get started, that you download the source code if you haven t already and then download and install the executables for your chosen platform. It is important to have the compiled binaries handy in case things go wrong during your experiments. Attempting to diagnose a problem with a modified MySQL source code build without a reference point can be quite challenging. You will save yourself a lot of time if you can revert to the base compiled binary when you encounter a difficult debugging problem. I will cover debugging in more detail in 5. If you ever find yourself with that system problem, you can always reinstall the binaries and return your MySQL system to normal. Compiling the source is easy. If you are using Linux, open a command shell, change to the root of your source tree, and run the configure, make, and make install commands.
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