[lldb][test] TestExprCompletion.py: add tests for completion of reserved identifiers (#84890)

4 files changed, 19 insertions, 0 deletions

diff --git a/lldb/test/API/commands/expression/completion/Makefile b/lldb/test/API/commands/expression/completion/Makefile
index 020dce7..9882622 100644
--- a/lldb/test/API/commands/expression/completion/Makefile
+++ b/lldb/test/API/commands/expression/completion/Makefile
@@ -1,3 +1,4 @@
 CXX_SOURCES := main.cpp other.cpp
+CXXFLAGS += -isystem $(SRCDIR)/sys
 
 include Makefile.rules
diff --git a/lldb/test/API/commands/expression/completion/TestExprCompletion.py b/lldb/test/API/commands/expression/completion/TestExprCompletion.py
index c6a1e3c..022b943 100644
--- a/lldb/test/API/commands/expression/completion/TestExprCompletion.py
+++ b/lldb/test/API/commands/expression/completion/TestExprCompletion.py
@@ -246,6 +246,11 @@ class CommandLineExprCompletionTestCase(TestBase):
             "expr some_expr.Self(). FooNoArgs", "expr some_expr.Self(). FooNoArgsBar()"
         )
 
+        self.complete_from_to("expr myVec.__f", "expr myVec.__func()")
+        self.complete_from_to("expr myVec._F", "expr myVec._Func()")
+        self.complete_from_to("expr myVec.__m", "expr myVec.__mem")
+        self.complete_from_to("expr myVec._M", "expr myVec._Mem")
+
     def test_expr_completion_with_descriptions(self):
         self.build()
         self.main_source = "main.cpp"
diff --git a/lldb/test/API/commands/expression/completion/main.cpp b/lldb/test/API/commands/expression/completion/main.cpp
index 908bebbeb..5e03805 100644
--- a/lldb/test/API/commands/expression/completion/main.cpp
+++ b/lldb/test/API/commands/expression/completion/main.cpp
@@ -1,3 +1,5 @@
+#include <reserved.h>
+
 namespace LongNamespaceName { class NestedClass { long m; }; }
 
 // Defined in other.cpp, we only have a forward declaration here.
@@ -31,5 +33,8 @@ int main()
     some_expr.FooNumbersBar1();
     Expr::StaticMemberMethodBar();
     ForwardDecl *fwd_decl_ptr = &fwd_decl;
+    MyVec myVec;
+    myVec.__func();
+    myVec._Func();
     return 0; // Break here
 }
diff --git a/lldb/test/API/commands/expression/completion/sys/reserved.h b/lldb/test/API/commands/expression/completion/sys/reserved.h
new file mode 100644
index 0000000..0ce10ebe
--- /dev/null
+++ b/lldb/test/API/commands/expression/completion/sys/reserved.h
@@ -0,0 +1,8 @@
+class MyVec {
+  int __mem;
+  int _Mem;
+
+public:
+  void __func() {}
+  void _Func() {}
+};