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CHAPTER 5 DEBUGGING
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Breakpoint 1, factorial (num=3) at sample.c:9 9 for (i = 1; i < num; i++) (gdb) next 11 fact += fact * i; (gdb) bnext Program received signal SIGTRAP, Trace/breakpoint trap. 0x08048436 in factorial (num=3) at sample.c:9 9 for (i = 1; i < num; i++) (gdb) next 11 fact += fact * i; (gdb) break sample.c:13 Breakpoint 2 at 0x8048438: file sample.c, line 13. (gdb) continue Continuing. Breakpoint 2, factorial (num=3) at sample.c:13 13 return fact; (gdb) print fact $1 = 18 (gdb) bnext Program received signal SIGTRAP, Trace/breakpoint trap. 0x08048436 in factorial (num=3) at sample.c:9 9 for (i = 1; i < num; i++) (gdb) print fact $2 = 18 (gdb) bnext Program received signal SIGTRAP, Trace/breakpoint trap. 0x08048429 in factorial (num=3) at sample.c:11 11 fact += fact * i; (gdb) print fact $3 = 6 (gdb) print i $4 = 2 (gdb) next 9 for (i = 1; i < num; i++) (gdb) print i $5 = 2 (gdb) print fact $6 = 18 (gdb) print num $7 = 3 (gdb) next
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CHAPTER 5 DEBUGGING
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Breakpoint 2, factorial (num=3) at sample.c:13 13 return fact; (gdb) continue Continuing. 3! = 18 (gdb) quit The program is running. Exit anyway (y or n) y # Notice the commands bnext in Listing 5-7. The bnext command is one of the unique UndoDB commands that allows for the back trace (bidirectional) of the execution. All of the UndoDB back trace commands are mirrors of the gdb commands. That makes this debugger very friendly to developers who use gdb.
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THERE IS NO WRONG WAY
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You may be wondering why I have included debugging methods that some may suggest are old school and not the latest vogue interactive development trend. I submit it is possible to argue that one debugging method is better than another in certain circumstances or even in the general case. However, it is true that any of the methods presented here, and potentially many others, can lead to successful results. Organizations should not force developers into a particular mold of do it this way (which applies to more than just debugging) because what works well for one instance or person may not work for others. My recommendation is to adopt whatever debugging tools or methods you feel best meet your needs and project. If that means using a trace-like method or an interactive method, it doesn t matter as long as you can efficiently and effectively debug your project. If you develop good troubleshooting skills and can get the information you need to discover the problem, how you get there shouldn t matter.
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Debugging MySQL
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You may have excellent debugging skills debugging your own applications, some of which may indeed be quite large. However, few have the opportunity to attempt to debug a large system like MySQL. While it isn t difficult, I have found many challenges during my work with the source code. I hope that the following sections give you the knowledge that I gained through my many trials. I encourage you to read through this section at least once and then follow my examples when you have time. I ll begin by examining a debugging session with an example of debugging MySQL using inline debugging statements. I ll then move on to an error handler example followed by an indepth look at debugging MySQL on both Linux and Windows. If you have been waiting for a chance to get your hands dirty with the MySQL source code, this section is for you. Roll up those sleeves and grab some of your favorite caffeine-laden beverage, because we re going in!
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CHAPTER 5 DEBUGGING
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MySQL AB has provided their customers with a robust inline debugging statements debugging tool based on the debugger originally created by Fred Fish and later modified by one of MySQL AB s founders, Michael Monty Widenius, for thread safety. This tool is actually a collection of C macros called DBUG. Using DBUG is easy because the macros provided allow you to simply place a single code statement where you want to record something. The MySQL AB developers have many good examples throughout the code. They record a great many aspects of the execution of the server. The individual macros are referred to as debug tags (called DBUG tags in the MySQL documentation). The tags currently used in the MySQL source code include the following: DBUG_ENTER: Identify entry into a function using function specification. DBUG_EXIT: Record return results from function. DBUG_INFO: Record diagnostic information. DBUG_WARNING: Record an unusual event or unexpected event. DBUG_ERROR: Record error codes (used in error handlers mainly). DBUG_LOOP: Record entry or exit from a loop. DBUG_TRANS: Record transaction information. DBUG_QUIT: Record a failure resulting in premature system shutdown. DBUG_QUERY: Record query statement. DBUG_ASSERT: Record the error on a failed test of an expression. Listing 5-8 shows how some of these tags are used in the mysqld_show_privileges() function. The highlighted code statements are some of the more commonly used DBUG tags. Listing 5-8. Example DBUG Tags bool mysqld_show_privileges(THD *thd) { List<Item> field_list; Protocol *protocol= thd->protocol; DBUG_ENTER("mysqld_show_privileges"); field_list.push_back(new Item_empty_string("Privilege",10)); field_list.push_back(new Item_empty_string("Context",15)); field_list.push_back(new Item_empty_string("Comment",NAME_LEN));
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