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Correct constness of system attributes in heap.c & prerequisites.

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This allows the compiler / linker to mark affected pages as read-only.

There's a fair number of pre-requisite changes, to allow the const
properly be propagated. Most of consts were already required for
correctness anyway, just not represented on the type-level.  Arguably
we could be more aggressive in using consts in related code, but..

This requires using a few of the types underlying typedefs that
removes pointers (e.g. const NameData *) as declaring the typedefed
type constant doesn't have the same meaning (it makes the variable
const, not what it points to).

Discussion: https://postgr.es/m/20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-10-16 09:44:43 -07:00
parent c015ccb306
commit 02a30a09f9
11 changed files with 32 additions and 31 deletions
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8
src/backend/parser/parse_relation.c
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@ -3135,7 +3135,7 @@ attnameAttNum(Relation rd, const char *attname, bool sysColOK)
static int
specialAttNum(const char *attname)
{
Form_pg_attribute sysatt;
const FormData_pg_attribute *sysatt;
sysatt = SystemAttributeByName(attname,
true /* "oid" will be accepted */ );
@ -3152,12 +3152,12 @@ specialAttNum(const char *attname)
* heap_open()'ed. Use the cache version get_atttype()
* for access to non-opened relations.
*/
Name
const NameData *
attnumAttName(Relation rd, int attid)
{
if (attid <= 0)
{
Form_pg_attribute sysatt;
const FormData_pg_attribute *sysatt;
sysatt = SystemAttributeDefinition(attid, rd->rd_rel->relhasoids);
return &sysatt->attname;
@ -3179,7 +3179,7 @@ attnumTypeId(Relation rd, int attid)
{
if (attid <= 0)
{
Form_pg_attribute sysatt;
const FormData_pg_attribute *sysatt;
sysatt = SystemAttributeDefinition(attid, rd->rd_rel->relhasoids);
return sysatt->atttypid;