as it turns out, it is not possible to set pending breakpoints until
gdb has loaded as image. so add some hooks to enable adapters to trigger
the initial breakpoint syncing at the right time. do not add additional
states (say, InferiorPreparing), as it would just complicate things.
this includes:
- move the gdb ownership back to the engine (thus strip down the
adaptors as far as possible)
- make gdb startup synchronous
- make adapter shutdown synchronous
- fix the state transitions relating to shutdown
each command can have only one of two legitimate responses: "error" or -
depending on the command, and thus declared via a flag - "done" or
"running".
this is way nicer than sprinkling the code with else-ifs (where elses
are sufficient) and asserts all over the place - and silently failing in
release builds.
Fix gdb commands, state changes and signals emissions.
- There were some invalid gdb commands (e.g. "attach").
- There also were a number of unexplected state transitions.
rename GdbResultRecord into GdbResponse
merge cookie QVariant into GdbResponse
move debugMessage convienience function from individual adapters to base
