[lldb] Don't emit artificial constructor declarations as global functions

Summary:
When we have a artificial constructor DIE, we currently create from that a global function with the name of that class.
That ends up causing a bunch of funny errors such as "must use 'struct' tag to refer to type 'Foo' in this scope" when
doing `Foo f`. Also causes that constructing a class via `Foo()` actually just calls that global function.

The fix is that when we have an artificial method decl, we always treat it as handled even if we don't create a CXXMethodDecl
for it (which we never do for artificial methods at the moment).

Fixes rdar://55757491 and probably some other radars.

Reviewers: aprantl, vsk, shafik

Reviewed By: aprantl

Subscribers: jingham, shafik, labath, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D68130

llvm-svn: 375151

4 files changed, 19 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/TestCallOverriddenMethod.py b/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/TestCallOverriddenMethod.py
index c22fffb4f23..93b91854281 100644
--- a/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/TestCallOverriddenMethod.py
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/TestCallOverriddenMethod.py
@@ -49,3 +49,7 @@ class ExprCommandCallOverriddenMethod(TestBase):
 
         # Test calling the base class.
         self.expect("expr realbase.foo()", substrs=["1"])
+
+        # Test with locally constructed instances.
+        self.expect("expr Base().foo()", substrs=["1"])
+        self.expect("expr Derived().foo()", substrs=["2"])
diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/main.cpp b/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/main.cpp
index 712c374eefd..87997fa354c 100644
--- a/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/main.cpp
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/call-overridden-method/main.cpp
@@ -11,6 +11,7 @@ public:
 
 int main() {
   Base realbase;
+  realbase.foo();
   Derived d;
   Base *b = &d;
   return 0; // Set breakpoint here
diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/TestIgnoreArtificialConstructors.py b/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/TestIgnoreArtificialConstructors.py
new file mode 100644
index 00000000000..03424658f3e
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/TestIgnoreArtificialConstructors.py
@@ -0,0 +1,4 @@
+from lldbsuite.test import lldbinline
+from lldbsuite.test import decorators
+
+lldbinline.MakeInlineTest(__file__, globals(), None)
diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/main.cpp b/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/main.cpp
new file mode 100644
index 00000000000..41457ebe1da
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/ignore-artificial-constructors/main.cpp
@@ -0,0 +1,10 @@
+struct Foo {
+  // Triggers that we emit an artificial constructor for Foo.
+  virtual ~Foo() = default;
+};
+
+int main() {
+  Foo f;
+  // Try to construct foo in our expression.
+  return 0; //%self.expect("expr Foo()", substrs=["(Foo) $0 = {}"])
+}