I guess my situation is an odd fringe case that probably doesn't happen too much, but I thought that knowledge of it might be useful to someone somewhere.
See PG_FREE_IF_COPY in fmgr.h
/*
* Support for cleaning up detoasted copies of inputs. This must only
* be used for pass-by-ref datatypes, and normally would only be used
* for toastable types. If the given pointer is different from the
* original argument, assume it's a palloc'd detoasted copy, and pfree
* it.
*
* NOTE: most functions on toastable types do not have to worry about
* this, but we currently require that support functions for indexes
* not leak memory.
*/
#define PG_FREE_IF_COPY(ptr,n) \
do { \
if ((Pointer) (ptr) != PG_GETARG_POINTER(n)) \
pfree(ptr); \
} while (0)Maybe you can use that or do something similar?
HTH,
Joe
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