[lldb] Fix some C++ virtual method call bugs in LLDB expression evaluation by

building method override tables for CXXMethodDecls in 
DWARFASTParserClang::CompleteTypeFromDWARF.

C++ virtual method calls in LLDB expressions may fail if the override table for
the method being called is not correct as IRGen will produce references to the
wrong (or a missing) vtable entry.

This patch does not fix calls to virtual methods with covariant return types as
it mistakenly treats these as overloads, rather than overrides. This will be
addressed in a future patch.

Review: https://reviews.llvm.org/D41997

Partially fixes <rdar://problem/14205774>

llvm-svn: 323163

1 files changed, 16 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/expression_command/call-overridden-method/main.cpp b/lldb/packages/Python/lldbsuite/test/expression_command/call-overridden-method/main.cpp
new file mode 100644
index 00000000000..54ae705d297
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/expression_command/call-overridden-method/main.cpp
@@ -0,0 +1,16 @@
+class Base {
+public:
+  virtual ~Base() {}
+  virtual void foo() {}
+};
+
+class Derived : public Base {
+public:
+  virtual void foo() {}
+};
+
+int main() {
+  Derived d;
+  Base *b = &d;
+  return 0; // Set breakpoint here
+}