Managing Symbol and Source Files in Software

Creation QR Code JIS X 0510 in Software Managing Symbol and Source Files
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Managing Symbol and Source Files
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Listing 47
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| | +---45A4624314000 | \---03sampleexe | \---refsptr | | +---45A4625414000 | \---03sampleexe | \---refsptr | +---03samplepdb | +---A69EEFF7C43B400799E03BF7BCF55A9B1 | \---03samplepdb | \---refsptr | | +---B10B7ACC81C54533AFEA5AF20D9B7A091 | \---03samplepdb | \---refsptr | | +---FF76A7EC166D489C943F238F76FCB32F1 | \---03samplepdb | \---refsptr
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(continued)
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The private and public symbol store structure is identical, but their content is different This simple organization model works for a small to medium project requiring reasonable disk usage For larger projects, symstoreexe has various other options that enable the symstoreexe tool to generate a more complex store, such as stores with symbol files stored in multiple locations or with compressed files The sysmstoreexe help describes the various options supported by the tool, which can be used for creating such complex stores The private symbol folder can then be stored on a file share and used by all users through the share UNC, something similar to \\symserver\symbols This UNC location becomes the symbol server used as a symbol path in the debuggers, as follows:
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0:000> !sympath srv*\\symserver\symbols Symbol search path srv*\\symserver\symbols
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Each symbol indexing operation gets a transaction identifier that can be used for further symbol management operations Normally, the transaction identifier is used to delete from the symbol store all symbol files corresponding to intermediate releases For example, in Listing 48, we use the symstoreexe tool to remove the file added in the transaction 0000000001 shown in Listing 46
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Managing the Symbols for Debugging
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Listing 48
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C:\AWD> symstore del /i 0000000001 /s c:\awdbin\symstorepri Finding ID 0000000004 SYMSTORE: Number of references deleted = 0 SYMSTORE: Number of files/pointers deleted = 2 SYMSTORE: Number of errors = 0
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4 MANAGING SYMBOL AND SOURCE FILES
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We can now publish the public symbol files on an Internet server This process is described in the next section
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Sharing Public Symbols on an HTTP Server
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The last step is to make the public symbols really public, by making them available using an HTTP symbol server Although it might seem to be a daunting task, it s actually quite simple The public symbols store folder created before must be added as a virtual directory in the web server storing the symbols The HTTP server must be configured to deliver the symbol files as application/octet-stream, as shown in Figure 41
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Managing Symbol and Source Files
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Step-by-step instructions are available in the symhttpdoc document, installed with the Debugging Tools for Windows in the symproxy folder The new server URL, assuming that the symbols are located in the symbols virtual folder, can be used as follows:
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0:000> !sympath srv*http://127001/symbols Symbol search path is: srv*http://127001/symbols
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After reading this section, you know what tools can be used to automate the symbol file management with minimal overhead The next section goes even further and describes how to prepare the symbol files with source server information
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Managing Source Files for Debugging
While the initial triage of most problems can be performed with access only to the correct private (or even public) symbols, engineers must validate the problem by analyzing the source files as well When the source files in question have gone through multiple changes, it is important to find the exact file used to generate the binary file This is exactly what we show how to solve in this section Unless the product is built and released just once in which case, each binary has a single set of source files associated with it the sources are usually managed by a source revision control system Multiple options exist ranging from open source products, such as Concurrent Versions System (CVS) or its successor Subversion (SVN), to commercial systems, such as ClearCase from IBM, Visual SourceSafe from Microsoft, or Perforce from the company with the same name The Debugging Tools for Windows provides a mechanism by which some information associated with source files is stored in a symbol file as part of the build process, and it is used later, when the corresponding module is loaded in the debugger