<rdar://problem/12493007>

Added a new API call to help efficiently determine if a SBValue could have children:

     bool
     SBValue::MightHaveChildren ();
     
This is inteneded to be used bui GUI programs that need to show if a SBValue needs a disclosure triangle when displaying a hierarchical type in a tree view without having to complete the type (by calling SBValue::GetNumChildren()) as completing the type is expensive.

llvm-svn: 166460

1 files changed, 24 insertions, 0 deletions

diff --git a/lldb/source/Core/ValueObject.cpp b/lldb/source/Core/ValueObject.cpp
index b5b55c9e24b..41c7dbe94fd 100644
--- a/lldb/source/Core/ValueObject.cpp
+++ b/lldb/source/Core/ValueObject.cpp
@@ -597,6 +597,30 @@ ValueObject::GetNumChildren ()
     }
     return m_children.GetChildrenCount();
 }
+
+bool
+ValueObject::MightHaveChildren()
+{
+    bool has_children;
+    clang_type_t clang_type = GetClangType();
+    if (clang_type)
+    {
+        const uint32_t type_info = ClangASTContext::GetTypeInfo (clang_type,
+                                                                 GetClangAST(),
+                                                                 NULL);
+        if (type_info & (ClangASTContext::eTypeHasChildren |
+                         ClangASTContext::eTypeIsPointer |
+                         ClangASTContext::eTypeIsReference))
+            has_children = true;
+    }
+    else
+    {
+        has_children = GetNumChildren () > 0;
+    }
+    return has_children;
+}
+
+// Should only be called by ValueObject::GetNumChildren()
 void
 ValueObject::SetNumChildren (uint32_t num_children)
 {