Add a new module: the debug-logger. For a while now, we've used the
same logging mechanism to emit both end-user messages and debugging-
valgrind-itself messages. This commit creates a new mechanism for the
latter purpose.
The main feature of m_debuglog is that it has zero dependencies on any
other module and therefore can safely operate all the way through
stage1 and stage2 startup. It is restricted to emitting debug info on
file descriptor 2 (stderr), but that's not a big deal.
As a result of this change the basic formatted-print routines
(vprintf) have been moved from vg_mylibc.c into m_debuglog, so that
m_debuglog remains standalone.
The %y format string is currently disabled, since supporting it ("show
symbol corresponding to this address") would create a dependency from
m_debuglog to the entire debug-info reading machinery and all the
stuff that depends on, thereby making a nonsense of m_debuglog being
standalone. Its omission does not seem to cause any regression tests
to fail, though.
The debug logger is activated with "-d". More "-d"s make it more
verbose.
m_debuglog.o is linked into both stage1 and stage2, but as it is
completely standalone this causes no particular problems.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3559 a5019735-40e9-0310-863c-91ae7b9d1cf9
9 files changed