Currently, dynamically declared functions and closures are inserted
into the function table under a runtime definition key, and then later
possibly renamed. When opcache is not used and a file containing a
closure is repeatedly included, this leads to a very large memory leak,
as the no longer needed closure declarations will never be freed
(https://bugs.php.net/bug.php?id=76982).
With this patch, dynamic functions are instead stored in a
dynamic_func_defs member on the op_array, which opcodes reference
by index. When the parent op_array is destroyed, the dynamic_func_defs
it contains are also destroyed (unless they are stilled used elsewhere,
e.g. because they have been bound, or are used by a live closure). This
resolves the fundamental part of the leak, though doesn't completely
fix it yet due to some arena allocations.
The main non-obvious change here is to static variable handling:
We can't destroy static_variables_ptr in destroy_op_array, as e.g.
that would clear the static variables in a dynamic function when
the op_array containing it is destroyed. Static variable destruction
is separated out for this reason (we already do static variable
destruction separately for normal functions, so we only need to
handle main scripts).
Closes GH-5595.
Valgrind 3.3.0 was released in 2007, not even RHEL has crap older than
this. It could be argued that 3.8.0, released in 2012, could be a safe
cutoff too.
Closes GH-6728.
The lack of such a check leads to false-passes of tests on Windows
which expect no output, but produce a segfault or similar issue. I
discovered this a while ago due to bad tests in an extension I maintain.
Closes GH-6722.
We already use <= for IS_SERIALIZED(), but the same general
problem can also occur for IS_UNSERIALIZED(). We don't seem to
hit this in practice prior to GH-5595 though.
Currently every --SKIPIF-- section in every test file results in 1
extra execution of PHP, every --EXTENSIONS-- section - in 2 executions.
This is quite wasteful, as skip checking code is extremely repetitive
and extensions are fixed for every binary/ini/command parameters
combination.
This patch adds caching to all such checks.
On my machine, the gains are quite noticeable: 36s instead of 43s
with -j16, 292s instead of 337s without concurrency. Cache stats are
3780 hits, 1247 misses in the latter case. In the future, tests could
be adjusted to have more uniform skip checks to improve performance even
more.
Closes GH-6681.
When no test paths are specified this shows up when 'make test' is used on a PECL extension without specifying tests to run (or in php-src too, I guess...)
Closes GH-6717.
