Revision e6a750aa

b/docs/tracing.txt
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   cannot include all user-defined struct declarations and it is therefore
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   necessary to use void * for pointers to structs.
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   Pointers (including char *) cannot be dereferenced easily (or at all) in
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   some trace backends.  If pointers are used, ensure they are meaningful by
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   themselves and do not assume the data they point to will be traced.  Do
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   not pass in string arguments.
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 * For everything else, use primitive scalar types (char, int, long) with the
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   appropriate signedness.
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