Function plpgsql_free_function_memory

src/pl/plpgsql/src/pl_funcs.c:724–778

}

void
plpgsql_free_function_memory(PLpgSQL_function *func)
{
	int			i;

	/* Better not call this on an in-use function */
	Assert(func->use_count == 0);

	/* Release plans associated with variable declarations */
	for (i = 0; i < func->ndatums; i++)
	{
		PLpgSQL_datum *d = func->datums[i];

		switch (d->dtype)
		{
			case PLPGSQL_DTYPE_VAR:
			case PLPGSQL_DTYPE_PROMISE:
				{
					PLpgSQL_var *var = (PLpgSQL_var *) d;

					free_expr(var->default_val);
					free_expr(var->cursor_explicit_expr);
				}
				break;
			case PLPGSQL_DTYPE_ROW:
				break;
			case PLPGSQL_DTYPE_REC:
				{
					PLpgSQL_rec *rec = (PLpgSQL_rec *) d;

					free_expr(rec->default_val);
				}
				break;
			case PLPGSQL_DTYPE_RECFIELD:
				break;
			default:
				elog(ERROR, "unrecognized data type: %d", d->dtype);
		}
	}
	func->ndatums = 0;

	/* Release plans in statement tree */
	if (func->action)
		free_block(func->action);
	func->action = NULL;

	/*
	 * And finally, release all memory except the PLpgSQL_function struct
	 * itself (which has to be kept around because there may be multiple
	 * fn_extra pointers to it).
	 */
	if (func->fn_cxt)
		MemoryContextDelete(func->fn_cxt);
	func->fn_cxt = NULL;
}


/**********************************************************************