[Clang AST Context] Add a few helper functions.

The first one allows us to add an enumerator to an enum if we
already have an APSInt, since ultimately the implementation just
constructs one anyway.  The second is just a general utility
function to covert a CompilerType to a clang::TagDecl.

llvm-svn: 349360

1 files changed, 8 insertions, 0 deletions

diff --git a/lldb/source/Symbol/ClangUtil.cpp b/lldb/source/Symbol/ClangUtil.cpp
index 7a67df48ee6..687fba7c7c3 100644
--- a/lldb/source/Symbol/ClangUtil.cpp
+++ b/lldb/source/Symbol/ClangUtil.cpp
@@ -48,3 +48,11 @@ CompilerType ClangUtil::RemoveFastQualifiers(const CompilerType &ct) {
   qual_type.removeLocalFastQualifiers();
   return CompilerType(ct.GetTypeSystem(), qual_type.getAsOpaquePtr());
 }
+
+clang::TagDecl *ClangUtil::GetAsTagDecl(const CompilerType &type) {
+  clang::QualType qual_type = ClangUtil::GetCanonicalQualType(type);
+  if (qual_type.isNull())
+    return nullptr;
+
+  return qual_type->getAsTagDecl();
+}