[lldb][test] Fix TestEmptyFuncThreadStepOut.py

lldb/test/API/functionalities/thread/finish-from-empty-func/TestEmptyFuncThreadStepOut.py

@@ -13,12 +13,31 @@ class FinishFromEmptyFunctionTestCase(TestBase):
 
     @skipIf(compiler="clang", compiler_version=['<', '17.0'])
     def test_finish_from_empty_function(self):
-        """Test that when stopped at a breakpoint in an empty function, finish leaves it correctly."""
+        """Test that when stopped at a breakpoint located at the last instruction
+        of a function, finish leaves it correctly."""
         self.build()
-        exe = self.getBuildArtifact("a.out")
-        target, process, thread, _ = lldbutil.run_to_name_breakpoint(
-            self, "done", exe_name=exe
+        target, _, thread, _ = lldbutil.run_to_source_breakpoint(
+            self, "// Set breakpoint here", lldb.SBFileSpec("main.c")
         )
+        # Find the address of the last instruction of 'done()' and set a breakpoint there.
+        # Even though 'done()' is empty, it may contain prologue and epilogue code, so
+        # simply setting a breakpoint at the function can place it before 'ret'.
+        error = lldb.SBError()
+        ret_bp_addr = lldb.SBAddress()
+        while True:
+            thread.StepInstruction(False, error)
+            self.assertTrue(error.Success())
+            frame = thread.GetSelectedFrame()
+            if "done" in frame.GetFunctionName():
+                ret_bp_addr = frame.GetPCAddress()
+            elif ret_bp_addr.IsValid():
+                # The entire function 'done()' has been stepped through, so 'ret_bp_addr'
+                # now contains the address of its last instruction, i.e. 'ret'.
+                break
+        ret_bp = target.BreakpointCreateByAddress(ret_bp_addr.GetLoadAddress(target))
+        self.assertTrue(ret_bp.IsValid())
+        # Resume the execution and hit the new breakpoint.
+        self.runCmd("cont")
         if self.TraceOn():
             self.runCmd("bt")
 
@@ -29,7 +48,6 @@ def test_finish_from_empty_function(self):
         )
         self.assertTrue(safety_bp.IsValid())
 
-        error = lldb.SBError()
         thread.StepOut(error)
         self.assertTrue(error.Success())
 

lldb/test/API/functionalities/thread/finish-from-empty-func/main.c

@@ -2,6 +2,7 @@
 void done() {}
 int main() {
   puts("in main");
+  done(); // Set breakpoint here
   done();
   puts("leaving main");
   return 0;