1 files changed, 135 insertions, 0 deletions
diff --git a/gnu/llvm/lldb/source/DataFormatters/FormatCache.cpp b/gnu/llvm/lldb/source/DataFormatters/FormatCache.cpp
new file mode 100644
index 00000000000..99f14070544
--- /dev/null
+++ b/gnu/llvm/lldb/source/DataFormatters/FormatCache.cpp
@@ -0,0 +1,135 @@
+//===-- FormatCache.cpp ------------------------------------------*- C++
+//-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+
+
+
+#include "lldb/DataFormatters/FormatCache.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+FormatCache::Entry::Entry()
+    : m_format_cached(false), m_summary_cached(false),
+      m_synthetic_cached(false) {}
+
+bool FormatCache::Entry::IsFormatCached() { return m_format_cached; }
+
+bool FormatCache::Entry::IsSummaryCached() { return m_summary_cached; }
+
+bool FormatCache::Entry::IsSyntheticCached() { return m_synthetic_cached; }
+
+void FormatCache::Entry::Get(lldb::TypeFormatImplSP &retval) {
+  retval = m_format_sp;
+}
+
+void FormatCache::Entry::Get(lldb::TypeSummaryImplSP &retval) {
+  retval = m_summary_sp;
+}
+
+void FormatCache::Entry::Get(lldb::SyntheticChildrenSP &retval) {
+  retval = m_synthetic_sp;
+}
+
+void FormatCache::Entry::Set(lldb::TypeFormatImplSP format_sp) {
+  m_format_cached = true;
+  m_format_sp = format_sp;
+}
+
+void FormatCache::Entry::Set(lldb::TypeSummaryImplSP summary_sp) {
+  m_summary_cached = true;
+  m_summary_sp = summary_sp;
+}
+
+void FormatCache::Entry::Set(lldb::SyntheticChildrenSP synthetic_sp) {
+  m_synthetic_cached = true;
+  m_synthetic_sp = synthetic_sp;
+}
+
+FormatCache::FormatCache()
+    : m_map(), m_mutex()
+#ifdef LLDB_CONFIGURATION_DEBUG
+      ,
+      m_cache_hits(0), m_cache_misses(0)
+#endif
+{
+}
+
+FormatCache::Entry &FormatCache::GetEntry(ConstString type) {
+  auto i = m_map.find(type), e = m_map.end();
+  if (i != e)
+    return i->second;
+  m_map[type] = FormatCache::Entry();
+  return m_map[type];
+}
+
+namespace lldb_private {
+
+template<> bool FormatCache::Entry::IsCached<lldb::TypeFormatImplSP>() {
+  return IsFormatCached();
+}
+template<> bool FormatCache::Entry::IsCached<lldb::TypeSummaryImplSP> () {
+  return IsSummaryCached();
+}
+template<> bool FormatCache::Entry::IsCached<lldb::SyntheticChildrenSP>() {
+  return IsSyntheticCached();
+}
+
+} // namespace lldb_private
+
+template <typename ImplSP>
+bool FormatCache::Get(ConstString type, ImplSP &format_impl_sp) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  auto entry = GetEntry(type);
+  if (entry.IsCached<ImplSP>()) {
+#ifdef LLDB_CONFIGURATION_DEBUG
+    m_cache_hits++;
+#endif
+    entry.Get(format_impl_sp);
+    return true;
+  }
+#ifdef LLDB_CONFIGURATION_DEBUG
+  m_cache_misses++;
+#endif
+  format_impl_sp.reset();
+  return false;
+}
+
+/// Explicit instantiations for the three types.
+/// \{
+template bool
+FormatCache::Get<lldb::TypeFormatImplSP>(ConstString, lldb::TypeFormatImplSP &);
+template bool
+FormatCache::Get<lldb::TypeSummaryImplSP>(ConstString,
+                                          lldb::TypeSummaryImplSP &);
+template bool
+FormatCache::Get<lldb::SyntheticChildrenSP>(ConstString,
+                                            lldb::SyntheticChildrenSP &);
+/// \}
+
+void FormatCache::Set(ConstString type, lldb::TypeFormatImplSP &format_sp) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  GetEntry(type).Set(format_sp);
+}
+
+void FormatCache::Set(ConstString type, lldb::TypeSummaryImplSP &summary_sp) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  GetEntry(type).Set(summary_sp);
+}
+
+void FormatCache::Set(ConstString type,
+                      lldb::SyntheticChildrenSP &synthetic_sp) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  GetEntry(type).Set(synthetic_sp);
+}
+
+void FormatCache::Clear() {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  m_map.clear();
+}