jeffreytan81 wrote:
As another data point, I just encountered a telemetry data from a customer.
Taking profile trace from that session shows "stackTrace" request takes more
than 4 seconds. Around 94% of the time was spent in this hot path performing
function evaluation:
```
lldb_dap::DAP::Loop()
lldb_dap::DAP::HandleObject(llvm::json::Object const&)
(anonymous namespace)::request_stackTrace(llvm::json::Object
const&)
|
|--93.90%--lldb::SBThread::GetCurrentExceptionBacktrace()
| lldb_private::Thread::GetCurrentExceptionBacktrace()
| lldb_private::Thread::GetCurrentException()
|
lldb_private::ItaniumABILanguageRuntime::GetExceptionObjectForThread(std::shared_ptr<lldb_private::Thread>)
| |
|
|--91.09%--lldb_private::FunctionCaller::ExecuteFunction(lldb_private::ExecutionContext&,
unsigned long*, lldb_private::EvaluateExpressionOptions const&,
lldb_private::DiagnosticManager&, lldb_private::Value&)
| | |
| |
|--87.22%--lldb_private::FunctionCaller::InsertFunction(lldb_private::ExecutionContext&,
unsigned long&, lldb_private::DiagnosticManager&)
| | | |
| | |
--87.13%--lldb_private::FunctionCaller::WriteFunctionWrapper(lldb_private::ExecutionContext&,
lldb_private::DiagnosticManager&)
| | | |
| | |
--86.33%--lldb_private::IRExecutionUnit::GetJITModule()
| | |
lldb_private::Module::SetLoadAddress(lldb_private::Target&, unsigned long,
bool, bool&)
| | |
lldb_private::ObjectFileJIT::SetLoadAddress(lldb_private::Target&, unsigned
long, bool)
```
So this will fix a potential massive performance issue in VSCode IDE.
https://github.com/llvm/llvm-project/pull/104874
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