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Silverlight SOS Commands

January 03, 2009

Today I became rather curious of what commands Silverlight's version of SOS provided (see my Learning WinDBG/SOS and Advanced Debugging post for more information on SOS).  I didn't really have any guess to whether there would be more, less, or the same.  So I ran Silverlight's SOS.dll through .NET's dumpbin.exe application with the /exports switch to get a list of what you can do with it.  In this case, the lower case DLL exports are the actual SOS commands you can use.  I did dumpbin.exe on the .NET 2.0 version and did a diff between them.  The results?  The Silverlight version of SOS actually has more commands than the .NET version.

Here is a list of SOS commands that aren't in the .NET version:

analyzeoom histobj vh
ao histobjfind vo
dumpsigelem histroot  
findroots histstats  
fq hof  
gcheapstat listnearobj  
gcwhere lno  
heapstat t  
histclear tp  
histinit verifyobj  

You can type these into your debugger to see the specific syntax for each of these.  For detailed information on most of these, you'll have to wait until something gets posted on MSDN or one of the SOS developers post something.  For a few, however, Sasha Goldshtein has provided some information and examples.  Here are some posts from this person's web site where you can find information no some of these new commands:

In case you're wondering, the .NET version has a few commands that the Silverlight version didn't have too.  This isn't a big deal as the commands that are missing don't really have much meaning for Silverlight (or have an alternative).  Here's a list of these:

comstate
dumpmethodsig
rcwcleanuplist
tst

Also, for the sake of completeness, below is the completely list of all Silverlight commands.  Just type then into WinDBG with the ! prefix to play with each of them.  For many of them you can type "!sos.help COMMANDNAME" to get help for a specific COMMANDNAME.

analyzeoom dumpsigelem histclear syncblk
ao dumpstack histinit t
bpmd dumpstackobjects histobj threadpool
clrstack dumpvc histobjfind threads
da eeheap histroot token2ee
do eestack histstats tp
dso eeversion hof traverseheap
dumparray ehinfo ip2md u
dumpassembly finalizequeue listnearobj verifyheap
dumpclass findappdomain lno verifyobj
dumpdomain findroots minidumpmode vh
dumpheap fq name2ee vmmap
dumpil gchandleleaks objsize vmstat
dumplog gchandles pe vo
dumpmd gcheapstat printexception  
dumpmodule gcinfo procinfo  
dumpmt gcroot savemodule  
dumpobj gcwhere soe  
dumpruntimetypes heapstat sosflush  
dumpsig help stoponexception  

Then there's the complete list of .NET SOS commands:

bpmd dumpstack procinfo
clrstack dumpstackobjects rcwcleanuplist
comstate dumpvc savemodule
da eeheap soe
do eestack sosflush
dso eeversion stoponexception
dumparray ehinfo syncblk
dumpassembly finalizequeue threadpool
dumpclass findappdomain threads
dumpdomain gchandleleaks token2ee
dumpheap gchandles traverseheap
dumpil gcinfo tst
dumplog gcroot u
dumpmd help verifyheap
dumpmethodsig ip2md vmmap
dumpmodule minidumpmode vmstat
dumpmt name2ee  
dumpobj objsize  
dumpruntimetypes pe  
dumpsig printexception  

If you haven't noticed yet, most of these aren't even documented commands. However, if you type them into SOS, you will not only see that they exist, you will be given the syntax for how to use them (and, then, there's !sos.help).

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