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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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14
contrib/xml2/xslt_proc.c
View File

@ -49,8 +49,8 @@ xslt_process(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXSLT
text *doct = PG_GETARG_TEXT_P(0);
text *ssheet = PG_GETARG_TEXT_P(1);
text *doct = PG_GETARG_TEXT_PP(0);
text *ssheet = PG_GETARG_TEXT_PP(1);
text *result;
text *paramstr;
const char **params;
@ -66,7 +66,7 @@ xslt_process(PG_FUNCTION_ARGS)
if (fcinfo->nargs == 3)
{
paramstr = PG_GETARG_TEXT_P(2);
paramstr = PG_GETARG_TEXT_PP(2);
params = parse_params(paramstr);
}
else
@ -85,16 +85,16 @@ xslt_process(PG_FUNCTION_ARGS)
bool xslt_sec_prefs_error;
/* Parse document */
doctree = xmlParseMemory((char *) VARDATA(doct),
VARSIZE(doct) - VARHDRSZ);
doctree = xmlParseMemory((char *) VARDATA_ANY(doct),
VARSIZE_ANY_EXHDR(doct));
if (doctree == NULL)
xml_ereport(xmlerrcxt, ERROR, ERRCODE_EXTERNAL_ROUTINE_EXCEPTION,
"error parsing XML document");
/* Same for stylesheet */
ssdoc = xmlParseMemory((char *) VARDATA(ssheet),
VARSIZE(ssheet) - VARHDRSZ);
ssdoc = xmlParseMemory((char *) VARDATA_ANY(ssheet),
VARSIZE_ANY_EXHDR(ssheet));
if (ssdoc == NULL)
xml_ereport(xmlerrcxt, ERROR, ERRCODE_EXTERNAL_ROUTINE_EXCEPTION,