[Lldb-commits] [lldb] [lldb][Windows] Don't synthesise a fake thread name from the executable (PR #199983)

[Charles Zablit via lldb-commits]

https://github.com/charles-zablit created https://github.com/llvm/llvm-project/pull/199983

Windows threads only have a name if the debuggee calls [`SetThreadDescription`](https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-setthreaddescription). When running with lldb-server.exe, that name is currently synthesised to the executable's name.

This patch drops this synthesised name mechanism entirely to match the current `ProcessWindows` behavior (which does not print a thread's name). It fixes the following tests when running with `LLDB_USE_LLDB_SERVER=1`.

- `SymbolFile/NativePDB/stack_unwinding01.cpp`
- `SymbolFile/PDB/add-symbols.cpp`

>From a0aed4b7998ad8717e80d417c13dc33149f7f147 Mon Sep 17 00:00:00 2001
From: Charles Zablit <c_zablit at apple.com>
Date: Wed, 27 May 2026 13:52:22 +0100
Subject: [PATCH] [lldb][Windows] Don't synthesise a fake thread name from the
 executable

---
 .../Process/Windows/Common/NativeThreadWindows.cpp  | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/lldb/source/Plugins/Process/Windows/Common/NativeThreadWindows.cpp b/lldb/source/Plugins/Process/Windows/Common/NativeThreadWindows.cpp
index 442af86af40d2..598bbdf6c9eed 100644
--- a/lldb/source/Plugins/Process/Windows/Common/NativeThreadWindows.cpp
+++ b/lldb/source/Plugins/Process/Windows/Common/NativeThreadWindows.cpp
@@ -99,17 +99,8 @@ Status NativeThreadWindows::DoResume(lldb::StateType resume_state) {
 }
 
 std::string NativeThreadWindows::GetName() {
-  if (!m_name.empty())
-    return m_name;
-
-  // Name is not a property of the Windows thread. Create one with the
-  // process's.
-  NativeProcessProtocol &process = GetProcess();
-  ProcessInstanceInfo process_info;
-  if (Host::GetProcessInfo(process.GetID(), process_info)) {
-    std::string process_name(process_info.GetName());
-    m_name = process_name;
-  }
+  // Windows threads only have a name when the inferior calls
+  // SetThreadDescription explicitly.
   return m_name;
 }