valgrind doesn't understand ioctl arguments, so it does not know if
or when they initialize memory, and it complains about conditionals
depending on data that comes out of ioctls. That's a problem for bees,
where every decision we ever make is based on data an ioctl gave us.
Fix the initialization issue by using calloc instead of malloc for
ByteVectors when we are building for valgrind. Don't enable this by
default because all the callocs aren't necessary (assuming the rest
of the code is correct) and hurt performance.
Define BEES_VALGRIND in localconf to activate, e.g.
echo CCFLAGS += -DBEES_VALGRIND=1 >> localconf
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
After some benchmarking, it turns out that std::vector<uint8_t> is
about 160 times slower than malloc(). malloc() is faster than "new
uint8_t[]" too. Get rid of std:;vector<uint8_t> and replace it with
a lightweight wrapper around malloc(), free(), and memcpy().
ByteVector has helpful methods for the common case of moving data to and
from ioctl calls that use a fixed-length header placed contiguously with a
variable-length input/output buffer. Data bytes are shared between copied
ByteVector objects, allowing a large single buffer to be cheaply chopped
up into smaller objects without memory copies. ByteVector implements the
more useful parts of the std::vector API, so it can replace std::vector
objects without needing an awkward adaptor class like Spanner.
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
