required since 81bc4cef2a5e651a9e34ae5400672a88663db7ef

ensure that it builds with make -j

and it does since 49712a5fae5919e6e333d7164b98ef986b149c62

the addresses used as values point to workspace or static memory,
which are free'd by other means

expect successful response status, but Content-Length may or may not
be set in the response

number "in the middle" does not capture any string, e.g. when
"(a|(z))(bc)" matches "abc", with no capture for backref 2

use them because they lint the output of varnishd -C, we won't bother.

This is a complete re-implementation, not just for Varnish 4, but also
because, for the state maintained to access the ov structure in backref,
it does not use a session table. Instead, regex objects have a pthread key
for thread-local access to the ov in the ctx workspace.

The worker workspace gets reset in miss/pass/pipe, so a copied substring
could get overwritten after recv.

This should fix an assertion failure when the ov became invalid between
a match and backref.

  match (according to the documentation). Change implementation and
  test to follow the documentation
- don't keep pcre internal state in struct sess_ov
- clean up struct sess_ov if the xid changes and if the workspace
  changes
- stramline getting the struct sess_ov

null byte of the back reference copy to the workspace, so any data from
following workspace allocations could appear to be appended to the return
value of re.backref() / vmod_backref.

The previous code had some issues:

- race: priv_call->priv could be incomplete when being non-null, so
  using it outside re_mutex was not safe.

  fix: make sure that the re_t is complete before referencing it in
  priv_call->priv using a membar

- caching dynamic REs did not work because invalid comparison of
  the cached pattern, also freeing the cached REs was incorrect

  it could be a good idea to add a global cache for compiled
  patterns (dynamic or not), but as long as we don't have that,
  it's probably safest to just recompile dynamic REs always

always include config.h first -- solaris (and others?) need defines from it (GNU_SOURCE in particular)

compilation fails).

and pattern.