tree 09ee51e26b229512814b51b10d8133e960c3d091
parent 37898ac8c132a7b4835ff528d6ed2791da2743c4
author Jake Ehrlich <jakehehrlich@google.com> 1541805228 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1542082296 +0000

[symbolize] Make syslog and loglistener nicer

These changes just ensure that when using syslog
and loglistner, the output from symbolizer doesn't
yell too much at you and looks nice.

1. Backtraces will sometimes contain a pc 0x0 case. It is not trivial
   to stop this from happening. To avoid yelling at the user too much
   we handle this case specifically.
2. It is sometimes the case that names for modules like <VMO#1234=ld.so>
   are used for module names in the markup. When this happens twice
   it will cause a name conflict. This change removes the warning
   for this because it is too loud. A TODO is added to account for it.
3. When using syslog headers there is also a type at the end like "INFO:"
   or "WARN:". The symbolizer was treating this as part of the message.
   This was fine at the time it was added but now for certain aesthetic
   things to happen some tags need to be on their own line with no
   other content. To make this happen we need to parse the type. This
   ensures that backtraces are printed properly and that context is
   removed correctly.

Change-Id: I176bc75988a0ed818a5874c144cf37dc36036756