Fix the managing of the session dictionary when you have nested wrappers

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -1286,6 +1286,8 @@ Status ScriptInterpreterPythonImpl::ExportFunctionDefinitionToInterpreter(
     StringList &function_def) {
   // Convert StringList to one long, newline delimited, const char *.
   std::string function_def_string(function_def.CopyList());
+  LLDB_LOG(GetLog(LLDBLog::Script), "Added Function:\n%s\n",
+           function_def_string.c_str());
 
   Status error = ExecuteMultipleLines(
       function_def_string.c_str(),
@@ -1356,13 +1358,15 @@ Status ScriptInterpreterPythonImpl::GenerateFunction(const char *signature,
       "    for key in new_keys:"); // Iterate over all the keys from session
                                    // dict
   auto_generated_function.AppendString(
-      "        internal_dict[key] = global_dict[key]"); // Update session dict
-                                                        // values
+      "        if key in old_keys:"); // If key was originally in
+                                      // global dict
   auto_generated_function.AppendString(
-      "        if key not in old_keys:"); // If key was not originally in
-                                          // global dict
+      "            internal_dict[key] = global_dict[key]"); // Update it
   auto_generated_function.AppendString(
-      "            del global_dict[key]"); //  ...then remove key/value from
+      "        elif key in global_dict:"); // Then if it is still in the
+                                           // global dict
+  auto_generated_function.AppendString(
+      "            del global_dict[key]"); //  remove key/value from the
                                            //  global dict
   auto_generated_function.AppendString(
       "    return __return_val"); //  Return the user callback return value.

lldb/test/API/functionalities/breakpoint/nested_breakpoint_commands/Makefile

@@ -0,0 +1,4 @@
+C_SOURCES := main.c
+CFLAGS_EXTRAS := -std=c99
+
+include Makefile.rules

lldb/test/API/functionalities/breakpoint/nested_breakpoint_commands/TestNestedBreakpointCommands.py

@@ -0,0 +1,59 @@
+"""
+Test that a Python breakpoint callback defined in another Python
+breakpoint callback works properly. 
+"""
+
+
+import lldb
+import os
+import lldbsuite.test.lldbutil as lldbutil
+from lldbsuite.test.lldbtest import *
+
+
+class TestNestedBreakpointCommands(TestBase):
+    NO_DEBUG_INFO_TESTCASE = True
+
+    def test_nested_commands(self):
+        self.build()
+        self.main_source_file = lldb.SBFileSpec("main.c")
+        self.callback_module = "make_bkpt_cmds"
+        self.do_test()
+
+    def do_test(self):
+        (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
+            self, "Set a breakpoint here", self.main_source_file
+        )
+
+        outer_bkpt = target.BreakpointCreateBySourceRegex(
+            "Set outer breakpoint here", self.main_source_file
+        )
+        cmd_file_path = os.path.join(self.getSourceDir(), f"{self.callback_module}.py")
+        self.runCmd(f"command script import {cmd_file_path}")
+        outer_bkpt.SetScriptCallbackFunction(f"{self.callback_module}.outer_callback")
+
+        process.Continue()
+
+        self.assertEqual(
+            thread.stop_reason, lldb.eStopReasonBreakpoint, "Right stop reason"
+        )
+
+        bkpt_no = thread.stop_reason_data[0]
+
+        # We made the callbacks record the new breakpoint ID and the number of
+        # times a callback ran in some globals in the target.  Find them now:
+        exec_module = target.FindModule(target.executable)
+        self.assertTrue(exec_module.IsValid(), "Found executable module")
+        var = exec_module.FindFirstGlobalVariable(target, "g_global")
+        self.assertSuccess(var.GetError(), "Found globals")
+        num_hits = var.GetChildAtIndex(1).GetValueAsUnsigned()
+        inner_id = var.GetChildAtIndex(2).GetValueAsUnsigned()
+
+        # Make sure they have the right values:
+        self.assertEqual(bkpt_no, inner_id, "Hit the right breakpoint")
+        self.assertEqual(num_hits, 2, "Right counter end value")
+        self.assertEqual(thread.frames[0].name, "main", "Got to main")
+
+        self.assertEqual(outer_bkpt.GetHitCount(), 1, "Hit outer breakpoint once")
+
+        inner_bkpt = target.FindBreakpointByID(inner_id)
+        self.assertEqual(inner_bkpt.GetHitCount(), 1, "Hit inner breakpoint once")

lldb/test/API/functionalities/breakpoint/nested_breakpoint_commands/main.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int g_global[3] = {0, 100000, 100000};
+
+void doSomething() {
+  g_global[0] = 1; // Set outer breakpoint here
+}
+
+int main() {
+  doSomething(); // Set a breakpoint here
+
+  return g_global[0];
+}

lldb/test/API/functionalities/breakpoint/nested_breakpoint_commands/make_bkpt_cmds.py

@@ -0,0 +1,30 @@
+import lldb
+
+
+def set_globals(target, index, value):
+    exe_module = target.FindModule(target.executable)
+    var = exe_module.FindFirstGlobalVariable(target, "g_global")
+    child = var.GetChildAtIndex(index)
+    child.SetValueFromCString(str(value))
+
+
+def outer_callback(frame: lldb.SBFrame, bp_loc, internal_dict):
+    thread = frame.GetThread()
+
+    # address of the next frame
+    next_frame_pc = thread.get_thread_frames()[1].GetPC()
+
+    target = thread.process.target
+    bp = target.BreakpointCreateByAddress(next_frame_pc)
+    bp.SetScriptCallbackFunction(f"{__name__}.nested_bp_callback")
+    set_globals(target, 1, 1)
+    set_globals(target, 2, bp.GetID())
+
+    return False
+
+
+def nested_bp_callback(frame: lldb.SBFrame, bp_loc, extra_args, internal_dict):
+    target = frame.thread.process.target
+    set_globals(target, 1, 2)
+
+    return True