1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Trace/intel-pt/ThreadDecoder.h b/contrib/llvm-project/lldb/source/Plugins/Trace/intel-pt/ThreadDecoder.h
new file mode 100644
index 000000000000..289915c02810
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+++ b/contrib/llvm-project/lldb/source/Plugins/Trace/intel-pt/ThreadDecoder.h
@@ -0,0 +1,59 @@
+//===-- ThreadDecoder.h --======---------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_TRACE_THREAD_DECODER_H
+#define LLDB_SOURCE_PLUGINS_TRACE_THREAD_DECODER_H
+
+#include "DecodedThread.h"
+#include "forward-declarations.h"
+#include "intel-pt.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Utility/FileSpec.h"
+#include <optional>
+
+namespace lldb_private {
+namespace trace_intel_pt {
+
+/// Class that handles the decoding of a thread and caches the result.
+class ThreadDecoder {
+public:
+  /// \param[in] thread_sp
+  ///     The thread whose intel pt trace buffer will be decoded.
+  ///
+  /// \param[in] trace
+  ///     The main Trace object who owns this decoder and its data.
+  ThreadDecoder(const lldb::ThreadSP &thread_sp, TraceIntelPT &trace);
+
+  /// Decode the thread and store the result internally, to avoid
+  /// recomputations.
+  ///
+  /// \return
+  ///     A \a DecodedThread instance.
+  llvm::Expected<DecodedThreadSP> Decode();
+
+  /// \return
+  ///     The lowest TSC value in this trace if available, \a std::nullopt if
+  ///     the trace is empty or the trace contains no timing information, or an
+  ///     \a llvm::Error if it was not possible to set up the decoder.
+  llvm::Expected<std::optional<uint64_t>> FindLowestTSC();
+
+  ThreadDecoder(const ThreadDecoder &other) = delete;
+  ThreadDecoder &operator=(const ThreadDecoder &other) = delete;
+
+private:
+  llvm::Expected<DecodedThreadSP> DoDecode();
+
+  lldb::ThreadSP m_thread_sp;
+  TraceIntelPT &m_trace;
+  std::optional<DecodedThreadSP> m_decoded_thread;
+};
+
+} // namespace trace_intel_pt
+} // namespace lldb_private
+
+#endif // LLDB_SOURCE_PLUGINS_TRACE_THREAD_DECODER_H