Add data formatter for libstdc++ tuple
Differential revision: https://reviews.llvm.org/D25733
llvm-svn: 284829
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp
new file mode 100644
index 0000000..42f006a
--- /dev/null
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp
@@ -0,0 +1,109 @@
+//===-- LibStdcppTuple.cpp --------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibStdcpp.h"
+
+#include <memory>
+#include <vector>
+
+#include "lldb/Core/ConstString.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/DataFormatters/TypeSynthetic.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+namespace {
+
+class LibStdcppTupleSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+ explicit LibStdcppTupleSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+ 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:
+ std::vector<ValueObjectSP> m_members;
+};
+
+} // end of anonymous namespace
+
+LibStdcppTupleSyntheticFrontEnd::LibStdcppTupleSyntheticFrontEnd(
+ lldb::ValueObjectSP valobj_sp)
+ : SyntheticChildrenFrontEnd(*valobj_sp) {
+ Update();
+}
+
+bool LibStdcppTupleSyntheticFrontEnd::Update() {
+ m_members.clear();
+
+ ValueObjectSP valobj_backend_sp = m_backend.GetSP();
+ if (!valobj_backend_sp)
+ return false;
+
+ ValueObjectSP next_child_sp = valobj_backend_sp->GetNonSyntheticValue();
+ while (next_child_sp != nullptr) {
+ ValueObjectSP current_child = next_child_sp;
+ next_child_sp = nullptr;
+
+ size_t child_count = current_child->GetNumChildren();
+ for (size_t i = 0; i < child_count; ++i) {
+ ValueObjectSP child_sp = current_child->GetChildAtIndex(i, true);
+ llvm::StringRef name_str = child_sp->GetName().GetStringRef();
+ if (name_str.startswith("std::_Tuple_impl<")) {
+ next_child_sp = child_sp;
+ } else if (name_str.startswith("std::_Head_base<")) {
+ ValueObjectSP value_sp =
+ child_sp->GetChildMemberWithName(ConstString("_M_head_impl"), true);
+ if (value_sp) {
+ StreamString name;
+ name.Printf("[%zd]", m_members.size());
+ value_sp->SetName(ConstString(name.GetData()));
+
+ m_members.push_back(value_sp);
+ }
+ }
+ }
+ }
+
+ return false;
+}
+
+bool LibStdcppTupleSyntheticFrontEnd::MightHaveChildren() { return true; }
+
+lldb::ValueObjectSP
+LibStdcppTupleSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
+ if (idx < m_members.size())
+ return m_members[idx];
+ return lldb::ValueObjectSP();
+}
+
+size_t LibStdcppTupleSyntheticFrontEnd::CalculateNumChildren() {
+ return m_members.size();
+}
+
+size_t LibStdcppTupleSyntheticFrontEnd::GetIndexOfChildWithName(
+ const ConstString &name) {
+ return ExtractIndexFromString(name.GetCString());
+}
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::LibStdcppTupleSyntheticFrontEndCreator(
+ CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+ return (valobj_sp ? new LibStdcppTupleSyntheticFrontEnd(valobj_sp) : nullptr);
+}