================
@@ -294,3 +310,83 @@ def test_stack_frame_module_id(self) -> None:
                     expected_id,
                     f"expected moduleId '{expected_id}' for {source_name}, 
got: {module_id}",
                 )
+
+    @skipIfWindows
+    def test_stack_frame_compile_unit_id(self) -> None:
+        """Test that a stack frame's compileUnitId resolves to its source 
file."""
+        program = self.getBuildArtifact("a.out")
+        session = self.build_and_create_session()
+        source = self.getSourcePath("main.c")
+        lines = [line_number(source, "recurse end")]
+
+        with session.configure(LaunchArgs(program=program)) as ctx:
+            breakpoint_ids = session.resolve_source_breakpoints(source, lines)
+
+        stop_event = session.verify_stopped_on_breakpoint(
+            breakpoint_ids, after=ctx.process_event
+        )
+        thread_id = self.expect_not_none(stop_event.body.threadId)
+        stack_frames = session.stack_trace(thread_id).body.stackFrames
+
+        ids = {
+            frame.compileUnitId
+            for frame in stack_frames
+            if frame.compileUnitId is not None
+        }
+        self.assertEqual(len(ids), 1, f"expected a single compile unit, got: 
{ids}")
----------------
rupprecht wrote:

This assertion fails downstream: `expected a single compile unit, got: {0, 4}`

Most frames point to compile unit 4, but the bottom frame points to unit 0 for 
start.S:

* `StackFrame(id=524328, name='main', line=10, column=3, 
source=Source(name='main.c', 
path='/path/to/lldb/test/API/tools/lldb-dap/stackTrace/main.c', 
sourceReference=None, presentationHint=None, origin=None, sources=None, 
adapterData=None, checksums=None), endLine=None, endColumn=None, 
canRestart=None, instructionPointerReference='0x2016E0', moduleId='963CB580', 
compileUnitId=4, presentationHint=None)`
* `StackFrame(id=524329, name='__libc_start_main', line=60, column=1, 
source=Source(name='__libc_start_main', 
path='/path/to/libc.so.6``__libc_start_main', sourceReference=1, 
presentationHint='deemphasize', origin=None, sources=None, adapterData=None, 
checksums=None), endLine=None, endColumn=None, canRestart=None, 
instructionPointerReference='0x7FCA6B34CF12', 
moduleId='30449E71-7B2F-9B62-0629-3B5F90426DA2', compileUnitId=None, 
presentationHint=None)`
* `StackFrame(id=524330, name='_start', line=120, column=0, 
source=Source(name='start.S', path='/path/to/start.S', sourceReference=None, 
presentationHint='deemphasize', origin=None, sources=None, adapterData=None, 
checksums=None), endLine=None, endColumn=None, canRestart=None, 
instructionPointerReference='0x20160A', moduleId='963CB580', compileUnitId=0, 
presentationHint=None)`

https://github.com/llvm/llvm-project/pull/222512
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