Streamline anachronistic Ptr2Long union usage
#533
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PostgreSQL itself has been requiring a C compiler that has uintptr_t since 9.0 (postgres/postgres@85d02a6). The PL/Java 1.6.x branch only supports back to PG 9.5, so there is no question the type is supported. An existing static assert in DualState.c is hereby changed to assert that sizeof(uintptr_t) <= sizeof(jlong); this is also assured for the present by a comment upstream in postgres.h section 1: "we require: sizeof(Datum) == sizeof(void *) == 4 or 8" (where Datum is uintptr_t). In passing, specifically type as SPIPlanPtr some variables that had been typed void *. That was once their actual type in the SPI docs, but not since PG 8.2. The few sites that ended up as PointerGetDatum(JLongGet(Pointer,...)) are effectively a longwinded way of doing nothing, but I left them that way to clearly reflect that a pointer is involved, and avoid assuming PointerGetDatum will always be as simple as it is.
While void * works, mistakes are more easily caught with the intended pointer type.
jcflack
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May 30, 2025
The merged work includes PR #533, which does away with the old Ptr2Long union in favor of new PointerGetJLong and JlongGet(... conversions. In merging, also convert the uses of Ptr2Long that were added on this branch.
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PostgreSQL itself has been requiring a C compiler that has
uintptr_tsince 9.0 (postgres/postgres@85d02a6). The PL/Java 1.6.x branch only supports back to PG 9.5, so there is no question the type is supported.An existing static assert in
DualState.cis hereby changed to assert thatsizeof(uintptr_t) <= sizeof(jlong); this is also assured for the present by a comment upstream inpostgres.hsection 1: "we require: sizeof(Datum) == sizeof(void *) == 4 or 8" (whereDatumisuintptr_t).In passing, specifically type as
SPIPlanPtrsome variables that had been typedvoid *. That was once their actual type in the SPI docs, but not since PG 8.2.The few sites that ended up as
PointerGetDatum(JLongGet(Pointer,...))are effectively a longwinded way of doing nothing, but I left them that way to clearly reflect that a pointer is involved, and avoid assumingPointerGetDatumwill always be as simple as it currently is.