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//===-- ThreadDecoder.cpp --======-----------------------------------------===//
// 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 "ThreadDecoder.h"
#include "../common/ThreadPostMortemTrace.h"
#include "LibiptDecoder.h"
#include "TraceIntelPT.h"
#include "llvm/Support/MemoryBuffer.h"
#include <optional>
#include <utility>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::trace_intel_pt;
using namespace llvm;
ThreadDecoder::ThreadDecoder(const ThreadSP &thread_sp, TraceIntelPT &trace)
: m_thread_sp(thread_sp), m_trace(trace) {}
Expected<std::optional<uint64_t>> ThreadDecoder::FindLowestTSC() {
std::optional<uint64_t> lowest_tsc;
Error err = m_trace.OnThreadBufferRead(
m_thread_sp->GetID(), [&](llvm::ArrayRef<uint8_t> data) -> llvm::Error {
Expected<std::optional<uint64_t>> tsc =
FindLowestTSCInTrace(m_trace, data);
if (!tsc)
return tsc.takeError();
lowest_tsc = *tsc;
return Error::success();
});
if (err)
return std::move(err);
return lowest_tsc;
}
Expected<DecodedThreadSP> ThreadDecoder::Decode() {
if (!m_decoded_thread.has_value()) {
if (Expected<DecodedThreadSP> decoded_thread = DoDecode()) {
m_decoded_thread = *decoded_thread;
} else {
return decoded_thread.takeError();
}
}
return *m_decoded_thread;
}
llvm::Expected<DecodedThreadSP> ThreadDecoder::DoDecode() {
return m_trace.GetThreadTimer(m_thread_sp->GetID())
.TimeTask("Decoding instructions", [&]() -> Expected<DecodedThreadSP> {
DecodedThreadSP decoded_thread_sp = std::make_shared<DecodedThread>(
m_thread_sp, m_trace.GetPerfZeroTscConversion());
Error err = m_trace.OnThreadBufferRead(
m_thread_sp->GetID(), [&](llvm::ArrayRef<uint8_t> data) {
return DecodeSingleTraceForThread(*decoded_thread_sp, m_trace,
data);
});
if (err)
return std::move(err);
return decoded_thread_sp;
});
}
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