Hi Zachary, related to this bug, I was looking into clang diagnostics and there
is one that would have helped us catch this, -Wimplicit-fallthrough. It would
have issued a warning for CommandObjectThread.cpp (when built with clang, of
course) but it won't generate a warning for
case 0:
case 1:
case 2:
... do something for values 0-2
break;
There are some places in lldb where we have code AND we intentionally fall
through; remarkably often there is a comment that it is intentional, like
case eConnectionStatusNoConnection: // No connection
case eConnectionStatusLostConnection: // Lost connection while
connected to a valid connection
done = true;
// Fall through...
case eConnectionStatusTimedOut: // Request timed out
if (log)
error.LogIfError (log,
etc. In this case, if we add [[clang::fallthrough]]; before the '// Fall
through...' comment, clang will not emit a warning.
I don't know the [[clang::fallthrough]]; syntax, I have a feeling it might be
some C++11 thing that other compilers will ignore. Do you know if MSVC will
ignore this markup if we add it to the sources in the places where we mean to
fall through?
(a quick look over the warnings makes me think there are probably another dozen
of these bugs in the lldb codebase. I'll look at those more closely on Monday.)
> On Feb 5, 2016, at 4:46 PM, Zachary Turner via lldb-commits
> <lldb-commits@lists.llvm.org> wrote:
>
> Sounds like we don't have a test for thread backtrace -s. I know I usually
> argue against tests of the CLI, but only when they're used instead of tests
> for the api. Seems like we should have at least one test for every option of
> every command.
>
> On Fri, Feb 5, 2016 at 4:35 PM Jim Ingham via lldb-commits
> <lldb-commits@lists.llvm.org> wrote:
> Author: jingham
> Date: Fri Feb 5 18:31:23 2016
> New Revision: 259962
>
> URL: http://llvm.org/viewvc/llvm-project?rev=259962&view=rev
> Log:
> Fix "thread backtrace -s": option was misparsed because of a missing break.
>
> <rdar://problem/24525106>
>
> Modified:
> lldb/trunk/source/Commands/CommandObjectThread.cpp
>
> Modified: lldb/trunk/source/Commands/CommandObjectThread.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Commands/CommandObjectThread.cpp?rev=259962&r1=259961&r2=259962&view=diff
> ==============================================================================
> --- lldb/trunk/source/Commands/CommandObjectThread.cpp (original)
> +++ lldb/trunk/source/Commands/CommandObjectThread.cpp Fri Feb 5 18:31:23
> 2016
> @@ -194,6 +194,7 @@ public:
> if (!success)
> error.SetErrorStringWithFormat("invalid integer
> value for option '%c'", short_option);
> }
> + break;
> case 'e':
> {
> bool success;
>
>
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