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Use wrappers of PG_DETOAST_DATUM_PACKED() more.

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This makes almost all core code follow the policy introduced in the
previous commit.  Specific decisions:

- Text search support functions with char* and length arguments, such as
  prsstart and lexize, may receive unaligned strings.  I doubt
  maintainers of non-core text search code will notice.

- Use plain VARDATA() on values detoasted or synthesized earlier in the
  same function.  Use VARDATA_ANY() on varlenas sourced outside the
  function, even if they happen to always have four-byte headers.  As an
  exception, retain the universal practice of using VARDATA() on return
  values of SendFunctionCall().

- Retain PG_GETARG_BYTEA_P() in pageinspect.  (Page images are too large
  for a one-byte header, so this misses no optimization.)  Sites that do
  not call get_page_from_raw() typically need the four-byte alignment.

- For now, do not change btree_gist.  Its use of four-byte headers in
  memory is partly entangled with storage of 4-byte headers inside
  GBT_VARKEY, on disk.

- For now, do not change gtrgm_consistent() or gtrgm_distance().  They
  incorporate the varlena header into a cache, and there are multiple
  credible implementation strategies to consider.
This commit is contained in:
Noah Misch
2017-03-12 19:35:34 -04:00
parent 9d7726c2ba
commit 3a0d473192
59 changed files with 521 additions and 529 deletions
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19
src/backend/tsearch/wparser.c
View File

@ -123,7 +123,7 @@ ts_token_type_byname(PG_FUNCTION_ARGS)
if (SRF_IS_FIRSTCALL())
{
text *prsname = PG_GETARG_TEXT_P(0);
text *prsname = PG_GETARG_TEXT_PP(0);
Oid prsId;
funcctx = SRF_FIRSTCALL_INIT();
@ -172,8 +172,8 @@ prs_setup_firstcall(FuncCallContext *funcctx, Oid prsid, text *txt)
st->list = (LexemeEntry *) palloc(sizeof(LexemeEntry) * st->len);
prsdata = (void *) DatumGetPointer(FunctionCall2(&prs->prsstart,
PointerGetDatum(VARDATA(txt)),
Int32GetDatum(VARSIZE(txt) - VARHDRSZ)));
PointerGetDatum(VARDATA_ANY(txt)),
Int32GetDatum(VARSIZE_ANY_EXHDR(txt))));
while ((type = DatumGetInt32(FunctionCall3(&prs->prstoken,
PointerGetDatum(prsdata),
@ -248,7 +248,7 @@ ts_parse_byid(PG_FUNCTION_ARGS)
if (SRF_IS_FIRSTCALL())
{
text *txt = PG_GETARG_TEXT_P(1);
text *txt = PG_GETARG_TEXT_PP(1);
funcctx = SRF_FIRSTCALL_INIT();
prs_setup_firstcall(funcctx, PG_GETARG_OID(0), txt);
@ -270,8 +270,8 @@ ts_parse_byname(PG_FUNCTION_ARGS)
if (SRF_IS_FIRSTCALL())
{
text *prsname = PG_GETARG_TEXT_P(0);
text *txt = PG_GETARG_TEXT_P(1);
text *prsname = PG_GETARG_TEXT_PP(0);
text *txt = PG_GETARG_TEXT_PP(1);
Oid prsId;
funcctx = SRF_FIRSTCALL_INIT();
@ -289,9 +289,9 @@ ts_parse_byname(PG_FUNCTION_ARGS)
Datum
ts_headline_byid_opt(PG_FUNCTION_ARGS)
{
text *in = PG_GETARG_TEXT_P(1);
text *in = PG_GETARG_TEXT_PP(1);
TSQuery query = PG_GETARG_TSQUERY(2);
text *opt = (PG_NARGS() > 3 && PG_GETARG_POINTER(3)) ? PG_GETARG_TEXT_P(3) : NULL;
text *opt = (PG_NARGS() > 3 && PG_GETARG_POINTER(3)) ? PG_GETARG_TEXT_PP(3) : NULL;
HeadlineParsedText prs;
List *prsoptions;
text *out;
@ -310,7 +310,8 @@ ts_headline_byid_opt(PG_FUNCTION_ARGS)
prs.lenwords = 32;
prs.words = (HeadlineWordEntry *) palloc(sizeof(HeadlineWordEntry) * prs.lenwords);
hlparsetext(cfg->cfgId, &prs, query, VARDATA(in), VARSIZE(in) - VARHDRSZ);
hlparsetext(cfg->cfgId, &prs, query,
VARDATA_ANY(in), VARSIZE_ANY_EXHDR(in));
if (opt)
prsoptions = deserialize_deflist(PointerGetDatum(opt));