[Lldb-commits] [PATCH] D73303: [lldb/Target] Add Abort StackFrame Recognizer

Med Ismail Bennani via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Fri Jan 24 09:26:23 PST 2020

mib marked an inline comment as done.
mib added inline comments.

Comment at: lldb/source/Target/AbortRecognizer.cpp:81
+    ThreadSP thread_sp, FileSpec module_spec, ConstString function_name) {
+  const uint32_t frames_to_fetch = 10;
+  StackFrameSP prev_frame_sp = nullptr;
friss wrote:
> mib wrote:
> > JDevlieghere wrote:
> > > Magic value? Why 10?
> > Pretty much. In the beginning I was unwinding the entire stack. But if there is too much frames (i.e. recursion) this would take too much time. We agreed with @friss and @jingham to unwind up to 10 frames at most.
> > 
> > Can you think of a better way to do it ?
> I don't think that's exactly what I said. My opinion was that asserts will have a pretty deterministic layout, and that we should know exactly what to unwind to determine whether we have an assert or not.
> In your test, you actually check that the frame with the assert is frame 4. If it is anything other then 4 in any configuration, then the test will fail. You might as well just put 4 in the code here rather than a magical 10.
The number of frames to unwind is different depending on the platform. I chose 10 to give us some extra margin but I'll change it to 4 or 5,

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