1 files changed, 159 insertions, 0 deletions

diff --git a/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp b/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
new file mode 100644
index 000000000000..9fb4f48e9090
--- /dev/null
+++ b/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
@@ -0,0 +1,159 @@
+//===-- LibCxxVector.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "LibCxx.h"
+
+#include "lldb/Core/ConstString.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+namespace lldb_private {
+    namespace formatters {
+        class LibcxxStdVectorSyntheticFrontEnd : public SyntheticChildrenFrontEnd
+        {
+        public:
+            LibcxxStdVectorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp);
+
+            ~LibcxxStdVectorSyntheticFrontEnd() override;
+
+            size_t
+            CalculateNumChildren() override;
+            
+            lldb::ValueObjectSP
+            GetChildAtIndex(size_t idx) override;
+            
+            bool
+            Update() override;
+            
+            bool
+            MightHaveChildren() override;
+            
+            size_t
+            GetIndexOfChildWithName(const ConstString &name) override;
+
+        private:
+            ValueObject* m_start;
+            ValueObject* m_finish;
+            CompilerType m_element_type;
+            uint32_t m_element_size;
+            std::map<size_t,lldb::ValueObjectSP> m_children;
+        };
+    } // namespace formatters
+} // namespace lldb_private
+
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::LibcxxStdVectorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
+SyntheticChildrenFrontEnd(*valobj_sp.get()),
+m_start(NULL),
+m_finish(NULL),
+m_element_type(),
+m_element_size(0),
+m_children()
+{
+    if (valobj_sp)
+        Update();
+}
+
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::~LibcxxStdVectorSyntheticFrontEnd()
+{
+    // these need to stay around because they are child objects who will follow their parent's life cycle
+    // delete m_start;
+    // delete m_finish;
+}
+
+size_t
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::CalculateNumChildren ()
+{
+    if (!m_start || !m_finish)
+        return 0;
+    uint64_t start_val = m_start->GetValueAsUnsigned(0);
+    uint64_t finish_val = m_finish->GetValueAsUnsigned(0);
+    
+    if (start_val == 0 || finish_val == 0)
+        return 0;
+    
+    if (start_val >= finish_val)
+        return 0;
+    
+    size_t num_children = (finish_val - start_val);
+    if (num_children % m_element_size)
+        return 0;
+    return num_children/m_element_size;
+}
+
+lldb::ValueObjectSP
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetChildAtIndex (size_t idx)
+{
+    if (!m_start || !m_finish)
+        return lldb::ValueObjectSP();
+    
+    auto cached = m_children.find(idx);
+    if (cached != m_children.end())
+        return cached->second;
+    
+    uint64_t offset = idx * m_element_size;
+    offset = offset + m_start->GetValueAsUnsigned(0);
+    StreamString name;
+    name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+    ValueObjectSP child_sp = CreateValueObjectFromAddress(name.GetData(), offset, m_backend.GetExecutionContextRef(), m_element_type);
+    m_children[idx] = child_sp;
+    return child_sp;
+}
+
+bool
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::Update()
+{
+    m_start = m_finish = NULL;
+    m_children.clear();
+    ValueObjectSP data_type_finder_sp(m_backend.GetChildMemberWithName(ConstString("__end_cap_"),true));
+    if (!data_type_finder_sp)
+        return false;
+    data_type_finder_sp = data_type_finder_sp->GetChildMemberWithName(ConstString("__first_"),true);
+    if (!data_type_finder_sp)
+        return false;
+    m_element_type = data_type_finder_sp->GetCompilerType().GetPointeeType();
+    m_element_size = m_element_type.GetByteSize(nullptr);
+    
+    if (m_element_size > 0)
+    {
+        // store raw pointers or end up with a circular dependency
+        m_start = m_backend.GetChildMemberWithName(ConstString("__begin_"),true).get();
+        m_finish = m_backend.GetChildMemberWithName(ConstString("__end_"),true).get();
+    }
+    return false;
+}
+
+bool
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::MightHaveChildren ()
+{
+    return true;
+}
+
+size_t
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
+{
+    if (!m_start || !m_finish)
+        return UINT32_MAX;
+    return ExtractIndexFromString(name.GetCString());
+}
+
+lldb_private::SyntheticChildrenFrontEnd*
+lldb_private::formatters::LibcxxStdVectorSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
+{
+    if (!valobj_sp)
+        return NULL;
+    return (new LibcxxStdVectorSyntheticFrontEnd(valobj_sp));
+}