Diagnostics Commands in VS .NET

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Table 3-2 Examples of SOS Managed Heap and Garbage Collector Commands
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Command Description
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DumpHeap
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TraverseHeap VerifyHeap
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Traverses the managed heap and collects and outputs detailed information about the heap itself and the objects located on the heap Displays information about the references (roots) to a specific object This can be very useful information when trying to figure out why an object has not yet been garbage collected Traverses the managed heap and outputs the results in a file that is understood by the CLR profiler tool As with any heap, the managed heap can also get corrupted This command verifies the integrity of the managed heap
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I ll defer the in-depth discussion of each of the commands in Table 3-2 until 5, where we will take a look at some common real-world examples of bugs that can surface when misusing the managed heap and garbage collector
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Diagnostics Commands
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In addition to all the great inspection commands so far discussed, the SOS debugger contains some very useful diagnostics commands that provide auxiliary information during a debug session In this part of the chapter, we will take a look at some of the more useful diagnostics commands and examples on how to use them
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Finding the Application Domain of an Object
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In 2, we discussed the notion of an application domain and how NET object instances are (most of the time) tied to a specific application domain To find out in which application domain a particular object instance lives, the FindAppDomain command can be used as shown in the following:
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0:000> !DumpStackObjects OS Thread Id: 0x1964 (0) ESP/REG Object Name 001aef54 01b85a80 MicrosoftWin32SafeHandlesSafeFileHandle 001af01c 01b86d64 AdvancedNETDebugging3ObjTypes
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3 BASIC DEBUGGING TASKS
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001af020 01b86d64 AdvancedNETDebugging3ObjTypes 001af030 01b858ac SystemObject[] (SystemString[]) 001af05c 01b858ac SystemObject[] (SystemString[]) 001af134 01b858ac SystemObject[] (SystemString[]) 001af2e4 01b858ac SystemObject[] (SystemString[]) 001af30c 01b858ac SystemObject[] (SystemString[]) 0:000> !FindAppDomain 01b86d64 AppDomain: 0022fd30 Name: 03ObjTypesexe ID: 1
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After the application domain of an object is known, you can use the DumpDomain command to get further information on the application domain Knowing the application domain of a given object instance can give you clues as to the origin of the object itself
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Process Information
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During debug sessions, it is sometimes useful to get more information about the process being debugged Examples of useful data include memory usage, environment variables, and process times To dump this information while debugging, the ProcInfo command can be used The ProcInfo command has the syntax
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!ProcInfo [-env] [-time] [-mem]
where the env, -time, -mem switches control which piece of information about the process that should be displayed If no switch is specified, it simply displays all three categories of information Here is an example of ProcInfo run on the 03ObjTypesexe sample application:
0:000> !ProcInfo ----------------------------------------------Environment =C:=C:\ADNDBin =ExitCode=E0434F4D ALLUSERSPROFILE=C:\ProgramData APPDATA=C:\Users\marioh\AppData\Roaming AVENGINE=C:\PROGRA~1\CA\SHARED~1\SCANEN~1 USERDOMAIN=REDMOND USERNAME=marioh
SOSEX Extension Commands
USERPROFILE=C:\Users\mariohREDMOND VS90COMNTOOLS=c:\Program Files\Microsoft Visual Studio 90\Common7\Tools\ windir=C:\Windows ----------------------------------------------Process Times Process Started at: 2008 Dec 3 6:42:500 Kernel CPU time : 0 days 00:00:0003 User CPU time : 0 days 00:00:0003 Total CPU time : 0 days 00:00:0006 ----------------------------------------------Process Memory WorkingSetSize: 7528 KB PeakWorkingSetSize: 8504 KB VirtualSize: 103004 KB PeakVirtualSize: 103004 KB PagefileUsage: 7716 KB PeakPagefileUsage: 7720 KB ----------------------------------------------72 percent of memory is in use Memory Availability (Numbers in MB) Total 3061 4095 2047 Avail 839 3495 1914
Physical Memory Page File Virtual Memory
SOSEX Extension Commands
We have seen numerous examples of managed code extension commands available in the SOS extension that make life easier when debugging managed code There exists another extension called SOSEX, which brings much needed and missing functionality to light for managed code debugging In the next few sections, we will take a look at the extension commands available in SOSEX
Extended Breakpoint Support
SOSEX introduces a set of new breakpoint commands that enable you to manage the list of breakpoints (enabled and disabled state) as well as set breakpoints on any given source code location
Breakpoint List
3 BASIC DEBUGGING TASKS
SOSEX keeps a list of all the managed code breakpoints that have been set using the SOSEX breakpoint commands It features a number of commands that allow you to