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1//===-- ThreadDecoder.cpp --======-----------------------------------------===//2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.3// See https://llvm.org/LICENSE.txt for license information.4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception5//6//===----------------------------------------------------------------------===//7 8#include "ThreadDecoder.h"9#include "../common/ThreadPostMortemTrace.h"10#include "LibiptDecoder.h"11#include "TraceIntelPT.h"12#include "llvm/Support/MemoryBuffer.h"13#include <optional>14#include <utility>15 16using namespace lldb;17using namespace lldb_private;18using namespace lldb_private::trace_intel_pt;19using namespace llvm;20 21ThreadDecoder::ThreadDecoder(const ThreadSP &thread_sp, TraceIntelPT &trace)22    : m_thread_sp(thread_sp), m_trace(trace) {}23 24Expected<std::optional<uint64_t>> ThreadDecoder::FindLowestTSC() {25  std::optional<uint64_t> lowest_tsc;26  Error err = m_trace.OnThreadBufferRead(27      m_thread_sp->GetID(), [&](llvm::ArrayRef<uint8_t> data) -> llvm::Error {28        Expected<std::optional<uint64_t>> tsc =29            FindLowestTSCInTrace(m_trace, data);30        if (!tsc)31          return tsc.takeError();32        lowest_tsc = *tsc;33        return Error::success();34      });35  if (err)36    return std::move(err);37  return lowest_tsc;38}39 40Expected<DecodedThreadSP> ThreadDecoder::Decode() {41  if (!m_decoded_thread.has_value()) {42    if (Expected<DecodedThreadSP> decoded_thread = DoDecode()) {43      m_decoded_thread = *decoded_thread;44    } else {45      return decoded_thread.takeError();46    }47  }48  return *m_decoded_thread;49}50 51llvm::Expected<DecodedThreadSP> ThreadDecoder::DoDecode() {52  return m_trace.GetThreadTimer(m_thread_sp->GetID())53      .TimeTask("Decoding instructions", [&]() -> Expected<DecodedThreadSP> {54        DecodedThreadSP decoded_thread_sp = std::make_shared<DecodedThread>(55            m_thread_sp, m_trace.GetPerfZeroTscConversion());56 57        Error err = m_trace.OnThreadBufferRead(58            m_thread_sp->GetID(), [&](llvm::ArrayRef<uint8_t> data) {59              return DecodeSingleTraceForThread(*decoded_thread_sp, m_trace,60                                                data);61            });62 63        if (err)64          return std::move(err);65        return decoded_thread_sp;66      });67}68