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Rearrange pseudotypes.c to get rid of duplicative code.
Commit a5954de10 replaced a lot of manually-coded stub I/O routines with code generated by macros. That was a good idea but it didn't go far enough, because there were still manually-coded stub input routines for types that had live output routines. Refactor the macro so that we can generate just a stub input routine at need. Also create similar macros to generate stub binary I/O routines, since we have some of those now. The only stub functions that remain hand-coded are shell_in() and shell_out(), which need to be separate because they use different error messages. While here, rearrange the commentary to discuss each type not each function. This provides a better way to explain the *why* of which types need which support, rather than just duplicatively annotating the functions. Discussion: https://postgr.es/m/24137.1584139352@sss.pgh.pa.us
This commit is contained in:
Tom Lane
parent
4dbcb3f844
commit
87c9c2571c
@ -29,362 +29,11 @@
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/*
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/*
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* cstring_in - input routine for pseudo-type CSTRING.
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* These macros generate input and output functions for a pseudo-type that
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*
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* will reject all input and output attempts. (But for some types, only
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* We might as well allow this to support constructs like "foo_in('blah')".
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* the input function need be dummy.)
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*/
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*/
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Datum
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#define PSEUDOTYPE_DUMMY_INPUT_FUNC(typname) \
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cstring_in(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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PG_RETURN_CSTRING(pstrdup(str));
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}
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/*
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* cstring_out - output routine for pseudo-type CSTRING.
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*
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* We allow this mainly so that "SELECT some_output_function(...)" does
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* what the user will expect.
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*/
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Datum
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cstring_out(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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PG_RETURN_CSTRING(pstrdup(str));
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}
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/*
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* cstring_recv - binary input routine for pseudo-type CSTRING.
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*/
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Datum
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cstring_recv(PG_FUNCTION_ARGS)
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{
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StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
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char *str;
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int nbytes;
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str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
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PG_RETURN_CSTRING(str);
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}
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/*
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* cstring_send - binary output routine for pseudo-type CSTRING.
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*/
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Datum
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cstring_send(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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StringInfoData buf;
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pq_begintypsend(&buf);
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pq_sendtext(&buf, str, strlen(str));
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PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
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}
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/*
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* anyarray_in - input routine for pseudo-type ANYARRAY.
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*/
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Datum
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anyarray_in(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "anyarray")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* anyarray_out - output routine for pseudo-type ANYARRAY.
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*
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* We may as well allow this, since array_out will in fact work.
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*/
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Datum
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anyarray_out(PG_FUNCTION_ARGS)
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{
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return array_out(fcinfo);
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}
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/*
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* anyarray_recv - binary input routine for pseudo-type ANYARRAY.
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*
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* XXX this could actually be made to work, since the incoming array
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* data will contain the element type OID. Need to think through
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* type-safety issues before allowing it, however.
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*/
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Datum
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anyarray_recv(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "anyarray")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* anyarray_send - binary output routine for pseudo-type ANYARRAY.
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*
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* We may as well allow this, since array_send will in fact work.
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*/
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Datum
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anyarray_send(PG_FUNCTION_ARGS)
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{
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return array_send(fcinfo);
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}
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/*
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* anyenum_in - input routine for pseudo-type ANYENUM.
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*/
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Datum
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anyenum_in(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "anyenum")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* anyenum_out - output routine for pseudo-type ANYENUM.
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*
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* We may as well allow this, since enum_out will in fact work.
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*/
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Datum
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anyenum_out(PG_FUNCTION_ARGS)
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{
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return enum_out(fcinfo);
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}
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/*
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* anyrange_in - input routine for pseudo-type ANYRANGE.
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*/
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Datum
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anyrange_in(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "anyrange")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* anyrange_out - output routine for pseudo-type ANYRANGE.
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*
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* We may as well allow this, since range_out will in fact work.
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*/
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Datum
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anyrange_out(PG_FUNCTION_ARGS)
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{
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return range_out(fcinfo);
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}
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/*
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* void_in - input routine for pseudo-type VOID.
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*
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* We allow this so that PL functions can return VOID without any special
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* hack in the PL handler. Whatever value the PL thinks it's returning
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* will just be ignored.
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*/
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Datum
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void_in(PG_FUNCTION_ARGS)
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{
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PG_RETURN_VOID(); /* you were expecting something different? */
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}
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/*
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* void_out - output routine for pseudo-type VOID.
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*
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* We allow this so that "SELECT function_returning_void(...)" works.
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*/
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Datum
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void_out(PG_FUNCTION_ARGS)
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{
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PG_RETURN_CSTRING(pstrdup(""));
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}
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/*
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* void_recv - binary input routine for pseudo-type VOID.
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*
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* Note that since we consume no bytes, an attempt to send anything but
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* an empty string will result in an "invalid message format" error.
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*/
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Datum
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void_recv(PG_FUNCTION_ARGS)
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{
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PG_RETURN_VOID();
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}
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/*
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* void_send - binary output routine for pseudo-type VOID.
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*
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* We allow this so that "SELECT function_returning_void(...)" works
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* even when binary output is requested.
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*/
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Datum
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void_send(PG_FUNCTION_ARGS)
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{
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StringInfoData buf;
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/* send an empty string */
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pq_begintypsend(&buf);
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PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
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}
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/*
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* shell_in - input routine for "shell" types (those not yet filled in).
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*/
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Datum
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shell_in(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of a shell type")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* shell_out - output routine for "shell" types.
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*/
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Datum
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shell_out(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot display a value of a shell type")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* pg_node_tree_in - input routine for type PG_NODE_TREE.
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*
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* pg_node_tree isn't really a pseudotype --- it's real enough to be a table
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* column --- but it presently has no operations of its own, and disallows
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* input too, so its I/O functions seem to fit here as much as anywhere.
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*/
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Datum
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pg_node_tree_in(PG_FUNCTION_ARGS)
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{
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/*
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* We disallow input of pg_node_tree values because the SQL functions that
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* operate on the type are not secure against malformed input.
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*/
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "pg_node_tree")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* pg_node_tree_out - output routine for type PG_NODE_TREE.
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*
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* The internal representation is the same as TEXT, so just pass it off.
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*/
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Datum
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pg_node_tree_out(PG_FUNCTION_ARGS)
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{
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return textout(fcinfo);
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}
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/*
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* pg_node_tree_recv - binary input routine for type PG_NODE_TREE.
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*/
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Datum
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pg_node_tree_recv(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "pg_node_tree")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* pg_node_tree_send - binary output routine for type PG_NODE_TREE.
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*/
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Datum
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pg_node_tree_send(PG_FUNCTION_ARGS)
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{
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return textsend(fcinfo);
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}
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/*
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* pg_ddl_command_in - input routine for type PG_DDL_COMMAND.
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*
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* Like pg_node_tree, pg_ddl_command isn't really a pseudotype; it's here for
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* the same reasons as that one.
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*/
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Datum
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pg_ddl_command_in(PG_FUNCTION_ARGS)
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{
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/*
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* Disallow input of pg_ddl_command value.
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*/
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "pg_ddl_command")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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* pg_ddl_command_out - output routine for type PG_DDL_COMMAND.
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*
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* We don't have any good way to output this type directly, so punt.
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*/
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Datum
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pg_ddl_command_out(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot output a value of type %s", "pg_ddl_command")));
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PG_RETURN_VOID();
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}
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/*
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* pg_ddl_command_recv - binary input routine for type PG_DDL_COMMAND.
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*/
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Datum
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pg_ddl_command_recv(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s", "pg_ddl_command")));
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PG_RETURN_VOID();
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}
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/*
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* pg_ddl_command_send - binary output routine for type PG_DDL_COMMAND.
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*/
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Datum
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pg_ddl_command_send(PG_FUNCTION_ARGS)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot output a value of type %s", "pg_ddl_command")));
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PG_RETURN_VOID();
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}
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/*
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* Generate input and output functions for a pseudotype that will reject all
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* input and output attempts.
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*/
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#define PSEUDOTYPE_DUMMY_IO_FUNCS(typname) \
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\
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Datum \
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Datum \
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typname##_in(PG_FUNCTION_ARGS) \
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typname##_in(PG_FUNCTION_ARGS) \
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{ \
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{ \
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@ -395,6 +44,11 @@ typname##_in(PG_FUNCTION_ARGS) \
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PG_RETURN_VOID(); /* keep compiler quiet */ \
|
PG_RETURN_VOID(); /* keep compiler quiet */ \
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} \
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} \
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\
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\
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|
extern int no_such_variable
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#define PSEUDOTYPE_DUMMY_IO_FUNCS(typname) \
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PSEUDOTYPE_DUMMY_INPUT_FUNC(typname); \
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\
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Datum \
|
Datum \
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typname##_out(PG_FUNCTION_ARGS) \
|
typname##_out(PG_FUNCTION_ARGS) \
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{ \
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{ \
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@ -407,14 +61,258 @@ typname##_out(PG_FUNCTION_ARGS) \
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\
|
\
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extern int no_such_variable
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extern int no_such_variable
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|
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|
/*
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|
* Likewise for binary send/receive functions. We don't bother with these
|
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|
* at all for many pseudotypes, but some have them. (By convention, if
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|
* a type has a send function it should have a receive function, even if
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* that's only dummy.)
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|
*/
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|
#define PSEUDOTYPE_DUMMY_RECEIVE_FUNC(typname) \
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|
Datum \
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|
typname##_recv(PG_FUNCTION_ARGS) \
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|
{ \
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|
ereport(ERROR, \
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|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
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|
errmsg("cannot accept a value of type %s", #typname))); \
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|
\
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|
PG_RETURN_VOID(); /* keep compiler quiet */ \
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|
} \
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|
\
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|
extern int no_such_variable
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|
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|
#define PSEUDOTYPE_DUMMY_BINARY_IO_FUNCS(typname) \
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|
PSEUDOTYPE_DUMMY_RECEIVE_FUNC(typname); \
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\
|
||||||
|
Datum \
|
||||||
|
typname##_send(PG_FUNCTION_ARGS) \
|
||||||
|
{ \
|
||||||
|
ereport(ERROR, \
|
||||||
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
|
||||||
|
errmsg("cannot display a value of type %s", #typname))); \
|
||||||
|
\
|
||||||
|
PG_RETURN_VOID(); /* keep compiler quiet */ \
|
||||||
|
} \
|
||||||
|
\
|
||||||
|
extern int no_such_variable
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* cstring
|
||||||
|
*
|
||||||
|
* cstring is marked as a pseudo-type because we don't want people using it
|
||||||
|
* in tables. But it's really a perfectly functional type, so provide
|
||||||
|
* a full set of working I/O functions for it. Among other things, this
|
||||||
|
* allows manual invocation of datatype I/O functions, along the lines of
|
||||||
|
* "SELECT foo_in('blah')" or "SELECT foo_out(some-foo-value)".
|
||||||
|
*/
|
||||||
|
Datum
|
||||||
|
cstring_in(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
char *str = PG_GETARG_CSTRING(0);
|
||||||
|
|
||||||
|
PG_RETURN_CSTRING(pstrdup(str));
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
cstring_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
char *str = PG_GETARG_CSTRING(0);
|
||||||
|
|
||||||
|
PG_RETURN_CSTRING(pstrdup(str));
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
cstring_recv(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
|
||||||
|
char *str;
|
||||||
|
int nbytes;
|
||||||
|
|
||||||
|
str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
|
||||||
|
PG_RETURN_CSTRING(str);
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
cstring_send(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
char *str = PG_GETARG_CSTRING(0);
|
||||||
|
StringInfoData buf;
|
||||||
|
|
||||||
|
pq_begintypsend(&buf);
|
||||||
|
pq_sendtext(&buf, str, strlen(str));
|
||||||
|
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* anyarray
|
||||||
|
*
|
||||||
|
* We need to allow output of anyarray so that, e.g., pg_statistic columns
|
||||||
|
* can be printed. Input has to be disallowed, however.
|
||||||
|
*
|
||||||
|
* XXX anyarray_recv could actually be made to work, since the incoming
|
||||||
|
* array data would contain the element type OID. It seems unlikely that
|
||||||
|
* it'd be sufficiently type-safe, though.
|
||||||
|
*/
|
||||||
|
PSEUDOTYPE_DUMMY_INPUT_FUNC(anyarray);
|
||||||
|
PSEUDOTYPE_DUMMY_RECEIVE_FUNC(anyarray);
|
||||||
|
|
||||||
|
Datum
|
||||||
|
anyarray_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return array_out(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
anyarray_send(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return array_send(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* anyenum
|
||||||
|
*
|
||||||
|
* We may as well allow output, since enum_out will in fact work.
|
||||||
|
*/
|
||||||
|
PSEUDOTYPE_DUMMY_INPUT_FUNC(anyenum);
|
||||||
|
|
||||||
|
Datum
|
||||||
|
anyenum_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return enum_out(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* anyrange
|
||||||
|
*
|
||||||
|
* We may as well allow output, since range_out will in fact work.
|
||||||
|
*/
|
||||||
|
PSEUDOTYPE_DUMMY_INPUT_FUNC(anyrange);
|
||||||
|
|
||||||
|
Datum
|
||||||
|
anyrange_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return range_out(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* void
|
||||||
|
*
|
||||||
|
* We support void_in so that PL functions can return VOID without any
|
||||||
|
* special hack in the PL handler. Whatever value the PL thinks it's
|
||||||
|
* returning will just be ignored. Conversely, void_out and void_send
|
||||||
|
* are needed so that "SELECT function_returning_void(...)" works.
|
||||||
|
*/
|
||||||
|
Datum
|
||||||
|
void_in(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
PG_RETURN_VOID(); /* you were expecting something different? */
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
void_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
PG_RETURN_CSTRING(pstrdup(""));
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
void_recv(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* Note that since we consume no bytes, an attempt to send anything but an
|
||||||
|
* empty string will result in an "invalid message format" error.
|
||||||
|
*/
|
||||||
|
PG_RETURN_VOID();
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
void_send(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
StringInfoData buf;
|
||||||
|
|
||||||
|
/* send an empty string */
|
||||||
|
pq_begintypsend(&buf);
|
||||||
|
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* shell
|
||||||
|
*
|
||||||
|
* shell_in and shell_out are entered in pg_type for "shell" types
|
||||||
|
* (those not yet filled in). They should be unreachable, but we
|
||||||
|
* set them up just in case some code path tries to do I/O without
|
||||||
|
* having checked pg_type.typisdefined anywhere along the way.
|
||||||
|
*/
|
||||||
|
Datum
|
||||||
|
shell_in(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
ereport(ERROR,
|
||||||
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||||||
|
errmsg("cannot accept a value of a shell type")));
|
||||||
|
|
||||||
|
PG_RETURN_VOID(); /* keep compiler quiet */
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
shell_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
ereport(ERROR,
|
||||||
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
||||||
|
errmsg("cannot display a value of a shell type")));
|
||||||
|
|
||||||
|
PG_RETURN_VOID(); /* keep compiler quiet */
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* pg_node_tree
|
||||||
|
*
|
||||||
|
* pg_node_tree isn't really a pseudotype --- it's real enough to be a table
|
||||||
|
* column --- but it presently has no operations of its own, and disallows
|
||||||
|
* input too, so its I/O functions seem to fit here as much as anywhere.
|
||||||
|
*
|
||||||
|
* We must disallow input of pg_node_tree values because the SQL functions
|
||||||
|
* that operate on the type are not secure against malformed input.
|
||||||
|
* We do want to allow output, though.
|
||||||
|
*/
|
||||||
|
PSEUDOTYPE_DUMMY_INPUT_FUNC(pg_node_tree);
|
||||||
|
PSEUDOTYPE_DUMMY_RECEIVE_FUNC(pg_node_tree);
|
||||||
|
|
||||||
|
Datum
|
||||||
|
pg_node_tree_out(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return textout(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
Datum
|
||||||
|
pg_node_tree_send(PG_FUNCTION_ARGS)
|
||||||
|
{
|
||||||
|
return textsend(fcinfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* pg_ddl_command
|
||||||
|
*
|
||||||
|
* Like pg_node_tree, pg_ddl_command isn't really a pseudotype; it's here
|
||||||
|
* for the same reasons as that one.
|
||||||
|
*
|
||||||
|
* We don't have any good way to output this type directly, so punt
|
||||||
|
* for output as well as input.
|
||||||
|
*/
|
||||||
|
PSEUDOTYPE_DUMMY_IO_FUNCS(pg_ddl_command);
|
||||||
|
PSEUDOTYPE_DUMMY_BINARY_IO_FUNCS(pg_ddl_command);
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Dummy I/O functions for various other pseudotypes.
|
||||||
|
*/
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(any);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(any);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(trigger);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(trigger);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(event_trigger);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(event_trigger);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(language_handler);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(language_handler);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(fdw_handler);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(fdw_handler);
|
||||||
|
PSEUDOTYPE_DUMMY_IO_FUNCS(table_am_handler);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(index_am_handler);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(index_am_handler);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(tsm_handler);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(tsm_handler);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(internal);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(internal);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(anyelement);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(anyelement);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(anynonarray);
|
PSEUDOTYPE_DUMMY_IO_FUNCS(anynonarray);
|
||||||
PSEUDOTYPE_DUMMY_IO_FUNCS(table_am_handler);
|
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user