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49c784ece7
Add the ability to label a column's default value in the catalog header,
and implement this for pg_attribute. A new function in Catalog.pm is
used to fill in a tuple with defaults. The build process will complain
loudly if a catalog entry is incomplete,
Commit 8137f2c323 labeled variable length columns for the C preprocessor.
Expose that label to genbki.pl so we can exclude those columns from schema
macros in a general fashion. Also, format schema macro entries according
to their types.
This means slightly less code maintenance, but more importantly it's a
proving ground for mechanisms intended to be used in later commits.
While at it, I (Álvaro) couldn't resist making some changes in
genbki.pl: rename some functions to actually indicate their purpose
instead of actively misleading onlookers; and don't iterate on the whole
of pg_type to find the entry for each catalog row, using a hash instead
of an array.
Author: John Naylor, some changes by Álvaro Herrera
Discussion: https://postgr.es/m/CAJVSVGVJHwD8sfDfZW9TbCHWKf=C1YDRM-rF=2JenRU_y+VcFg@mail.gmail.com
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* genbki.h
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* Required include file for all POSTGRES catalog header files
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*
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* genbki.h defines CATALOG(), DATA(), BKI_BOOTSTRAP and related macros
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* so that the catalog header files can be read by the C compiler.
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* (These same words are recognized by genbki.pl to build the BKI
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* bootstrap file from these header files.)
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*
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*
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* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/catalog/genbki.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef GENBKI_H
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#define GENBKI_H
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/* Introduces a catalog's structure definition */
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#define CATALOG(name,oid) typedef struct CppConcat(FormData_,name)
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/* Options that may appear after CATALOG (on the same line) */
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#define BKI_BOOTSTRAP
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#define BKI_SHARED_RELATION
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#define BKI_WITHOUT_OIDS
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#define BKI_ROWTYPE_OID(oid)
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#define BKI_SCHEMA_MACRO
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#define BKI_FORCE_NULL
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#define BKI_FORCE_NOT_NULL
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/* Specifies a default value for a catalog field */
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#define BKI_DEFAULT(value)
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/*
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* This is never defined; it's here only for documentation.
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*
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* Variable-length catalog fields (except possibly the first not nullable one)
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* should not be visible in C structures, so they are made invisible by #ifdefs
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* of an undefined symbol. See also MARKNOTNULL in bootstrap.c for how this is
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* handled.
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*/
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#undef CATALOG_VARLEN
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/* Declarations that provide the initial content of a catalog */
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/* In C, these need to expand into some harmless, repeatable declaration */
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#define DATA(x) extern int no_such_variable
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#define DESCR(x) extern int no_such_variable
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#define SHDESCR(x) extern int no_such_variable
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#endif /* GENBKI_H */
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