Fix a bug copying the stop hooks from the dummy target.

We didn't also copy over the next stop hook id, which meant we would
overwrite the stop hooks from the dummy target with stop hooks set
after they are copied over.

Author: jimingham

lldb/source/Target/Target.cpp

@@ -211,6 +211,7 @@ Target::~Target() {
 
 void Target::PrimeFromDummyTarget(Target &target) {
   m_stop_hooks = target.m_stop_hooks;
+  m_stop_hook_next_id = target.m_stop_hook_next_id;
 
   for (const auto &breakpoint_sp : target.m_breakpoint_list.Breakpoints()) {
     if (breakpoint_sp->IsInternal())

lldb/test/API/commands/target/stop-hooks/TestStopHooks.py

@@ -26,10 +26,15 @@ def test_stop_hooks_step_out(self):
         self.step_out_test()
 
     def test_stop_hooks_after_expr(self):
-        """Test that a stop hook fires when hitting a breakpoint
-        that runs an expression"""
+        """Test that a stop hook fires when hitting a breakpoint that
+           runs an expression"""
         self.after_expr_test()
 
+    def test_stop_hooks_before_and_after_creation(self):
+        """Test that if we add a stop hook in the dummy target, we can
+           they don't collide with ones set directly in the target."""
+        self.before_and_after_target()
+
     def step_out_test(self):
         (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
             self, "Set a breakpoint here", self.main_source_file
@@ -85,3 +90,18 @@ def after_expr_test(self):
         var = target.FindFirstGlobalVariable("g_var")
         self.assertTrue(var.IsValid())
         self.assertEqual(var.GetValueAsUnsigned(), 1, "Updated g_var")
+
+    def before_and_after_target(self):
+        interp = self.dbg.GetCommandInterpreter()
+        result = lldb.SBCommandReturnObject()
+        interp.HandleCommand("target stop-hook add -o 'expr g_var++'", result)
+        self.assertTrue(result.Succeeded(), "Set the target stop hook")
+
+        (target, process, thread, first_bkpt) = lldbutil.run_to_source_breakpoint(
+            self, "Set a breakpoint here", self.main_source_file
+        )
+
+        interp.HandleCommand("target stop-hook add -o 'thread backtrace'", result)
+        self.assertTrue(result.Succeeded(), "Set the target stop hook")
+        self.expect("target stop-hook list", substrs=["expr g_var++", "thread backtrace"])
+