[lldb] Use current execution context in SBDebugger

Use `GetSelectedExecutionContext()` instead of
`GetCommandInterpreter().GetExecutionContext()` in
`SBDebugger::GetInternalVariableValue/SBDebugger::SetInternalVariable`. The
execution context in the command interpreter might be empty, if no commands has
been executed yet (it is updated only when handling commands or completions --
e.g.
https://github.com/llvm/llvm-project/blob/main/lldb/source/Interpreter/CommandInterpreter.cpp#L1855).

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D95761

1 files changed, 32 insertions, 0 deletions

diff --git a/lldb/test/API/python_api/debugger/TestDebuggerAPI.py b/lldb/test/API/python_api/debugger/TestDebuggerAPI.py
index 32202acbe072..5d0311eb1b0c 100644
--- a/lldb/test/API/python_api/debugger/TestDebuggerAPI.py
+++ b/lldb/test/API/python_api/debugger/TestDebuggerAPI.py
@@ -43,3 +43,35 @@ class DebuggerAPITestCase(TestBase):
         target = lldb.SBTarget()
         self.assertFalse(target.IsValid())
         self.dbg.DeleteTarget(target)
+
+    @add_test_categories(['pyapi'])
+    def test_debugger_internal_variables(self):
+        debugger_name = self.dbg.GetInstanceName()
+
+        # Set a variable and check it was written successfully.
+        error = lldb.SBDebugger.SetInternalVariable(
+            'target.prefer-dynamic-value', 'no-dynamic-values', debugger_name)
+        self.assertTrue(error.Success())
+        ret = lldb.SBDebugger.GetInternalVariableValue(
+            'target.prefer-dynamic-value', debugger_name)
+        self.assertEqual(ret.GetSize(), 1)
+        self.assertEqual(ret.GetStringAtIndex(0), 'no-dynamic-values')
+
+        # Set a variable with a different value.
+        error = lldb.SBDebugger.SetInternalVariable(
+            'target.prefer-dynamic-value', 'no-run-target', debugger_name)
+        self.assertTrue(error.Success())
+        ret = lldb.SBDebugger.GetInternalVariableValue(
+            'target.prefer-dynamic-value', debugger_name)
+        self.assertEqual(ret.GetSize(), 1)
+        self.assertEqual(ret.GetStringAtIndex(0), 'no-run-target')
+
+        # Try setting invalid value, check for error.
+        error = lldb.SBDebugger.SetInternalVariable(
+            'target.prefer-dynamic-value', 'dummy-value', debugger_name)
+        self.assertTrue(error.Fail())
+        # Check that the value didn't change.
+        ret = lldb.SBDebugger.GetInternalVariableValue(
+            'target.prefer-dynamic-value', debugger_name)
+        self.assertEqual(ret.GetSize(), 1)
+        self.assertEqual(ret.GetStringAtIndex(0), 'no-run-target')