[lldb] Add test for calling const functions

lldb/packages/Python/lldbsuite/test/lang/cpp/function-qualifiers/Makefile

@@ -0,0 +1,3 @@
+CXX_SOURCES := main.cpp
+
+include Makefile.rules

lldb/packages/Python/lldbsuite/test/lang/cpp/function-qualifiers/TestCppFunctionQualifiers.py

@@ -0,0 +1,25 @@
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+class TestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def test(self):
+        self.build()
+        lldbutil.run_to_source_breakpoint(self,"// break here", lldb.SBFileSpec("main.cpp"))
+
+        # Test calling a function that has const/non-const overload.
+        self.expect_expr("c.func()", result_type="int", result_value="111")
+        self.expect_expr("const_c.func()", result_type="int", result_value="222")
+
+        # Call a function that is only const on a const/non-const instance.
+        self.expect_expr("c.const_func()", result_type="int", result_value="333")
+        self.expect_expr("const_c.const_func()", result_type="int", result_value="333")
+
+        # Call a function that is not const on a const/non-const instance.
+        self.expect_expr("c.nonconst_func()", result_type="int", result_value="444")
+        self.expect("expr const_c.nonconst_func()", error=True,
+            substrs=["'this' argument to member function 'nonconst_func' has type 'const C', but function is not marked const"])

lldb/packages/Python/lldbsuite/test/lang/cpp/function-qualifiers/main.cpp

@@ -0,0 +1,17 @@
+struct C {
+  int func() { return 111; }
+  int func() const { return 222; }
+
+  int const_func() const { return 333; }
+  int nonconst_func() { return 444; }
+};
+
+int main() {
+  C c;
+  const C const_c;
+  c.func();
+  c.nonconst_func();
+  const_c.func();
+  c.const_func();
+  return 0; // break here
+}