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CHAPTER 5 DEBUGGING
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sequence diagrams and identifies the tests created for each. Thus, when one part of a class (module) changes, you can easily find the set of tests you need to run for your regression testing. If you do not have a requirements matrix, you can either create one using a simple document or spreadsheet or annotate the source code files with the requirements they satisfy.
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Inline Debugging Statements
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Most novice developers start out placing print statements in their code. It is a common form of testing variables that permits them to learn the art of programming. You may think any debugging technique that uses inline debugging statements to be rudimentary or cumbersome, and you d be partially correct. Inline debugging statements are cumbersome, but can also be a powerful tool. Inline debugging statements are any code that is used to document or present the data or state of the system at a point in time. Before I present an example of inline debugging statements, let s consider the impact of using inline debugging statements. The first thing that comes to mind is that the debugging statements are code! Therefore, if the debugging statement does anything other than writing to the standard error stream (window), it could result in further unintended consequences. It should also be noted that inline debugging statements are usually stripped out or ignored (using conditional compilation) prior to building the system. If you are a tried-and-true validation and verification proponent, you d argue that this process introduces additional unwarranted risk. That is, the system being compiled for use is different than the one used to debug. However, inline debugging statements can be helpful in situations where either you cannot use an external debugger or the defect seems to occur at random intervals.1 Examples of when these situations could occur include real-time systems, multiprocess and multithreaded systems, and large systems operating on large amounts of data.
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INSTRUMENTATION
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Inline debugging statements are considered by many to be a form of instrumentation. This includes code designed to track performance, data, user, client, and execution metrics. Instrumentation is usually implemented by placing statements in the code to display data values, warnings, errors, and so forth but may also be implemented using wrapper code that monitors the execution in a sandbox-like environment. One example of a software instrumentation suite is Pin by Intel. For more information about software instrumentation and Pin, see http://rogue.colorado.edu/Pin/docs/tutorials/AsplosTutorial.htm.
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There are two types of inline debugging statements. The first is concerned with inspection. Lines of code are added to present the state of memory or the value of variables. This type of debugging statement is used during development and is typically commented out or ignored using conditional compilation. The second concerns tracing the path of the system as it executes. This type of debugging statement can be used at any time and is usually enabled or disabled by a switch at runtime. Since the first type is familiar to most developers (most of us learned debugging this way), I ll discuss the second with an example.
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1. Personally, I don t believe in random intervals. Until computers can think for themselves, they are just machines following the instructions humans gave them.
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CHAPTER 5 DEBUGGING
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Suppose you have a large system that is running in a multithreaded model and you re trying to determine what is causing a defect. Using inline debugging statements that present memory and variable values may help, but defects are rarely that easy to find. In this case, you may need to discover the state of the system leading up to the defect. If you had code in your system that simply wrote a log entry whenever it entered a function and another when it left (perhaps with some additional information about the data), it would be possible to determine what state the system was in by examining the log. Listing 5-1 depicts an excerpt from the MySQL source code that includes inline debugging statements. I ve highlighted the debugging code in bold. In this case, each of the inline debugging statements writes an entry in a trace file that can be examined after the system executes (or crashes). Listing 5-1. Example of Inline Debugging Statements /*************************************************************************** ** List all Authors. ** If you can update it, you get to be in it :) ***************************************************************************/ bool mysqld_show_authors(THD *thd) { List<Item> field_list; Protocol *protocol= thd->protocol; DBUG_ENTER("mysqld_show_authors"); field_list.push_back(new Item_empty_string("Name",40)); field_list.push_back(new Item_empty_string("Location",40)); field_list.push_back(new Item_empty_string("Comment",80)); if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(TRUE); show_table_authors_st *authors; for (authors= show_table_authors; authors->name; authors++) { protocol->prepare_for_resend(); protocol->store(authors->name, system_charset_info); protocol->store(authors->location, system_charset_info); protocol->store(authors->comment, system_charset_info); if (protocol->write()) DBUG_RETURN(TRUE); } send_eof(thd); DBUG_RETURN(FALSE); }
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