[Lldb-commits] [lldb] [lldb][test] Add expedited-stack-memory backtrace/locals packet test (PR #205897)

[Jason Molenda via lldb-commits]

jasonmolenda wrote:

This all looks reasonable to me.  It's good to have a test that debugserver is expediting the stack memory needed for a simple frame-chain stack walk, without sending any packets.  It's critical for performance but untested.  This C-based test case for different types of local variables (combining stack and heap memory access to print summaries) is a good start.  The use of a `volatile` register to try to suppress compiler optimization isn't needed - at `-O0` the compiler will generate code even when utterly unnecessary.  I've written test cases that look like
```
int main() { 
   int c = 10;
   c++;
   c++;
   c++
   return c;
}```

https://github.com/llvm/llvm-project/pull/205897