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d938c3cfb7
Add overlap functionality to llvm-profdata tool to compute the similarity between two profile files. Differential Revision: https://reviews.llvm.org/D60977 llvm-svn: 359612
472 lines
16 KiB
C++
472 lines
16 KiB
C++
//===- InstrProfWriter.cpp - Instrumented profiling writer ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing profiling data for clang's
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// instrumentation based PGO and coverage.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ProfileData/InstrProfWriter.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/ProfileSummary.h"
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#include "llvm/ProfileData/InstrProf.h"
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#include "llvm/ProfileData/ProfileCommon.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/OnDiskHashTable.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cstdint>
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#include <memory>
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#include <string>
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#include <tuple>
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#include <utility>
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#include <vector>
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using namespace llvm;
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// A struct to define how the data stream should be patched. For Indexed
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// profiling, only uint64_t data type is needed.
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struct PatchItem {
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uint64_t Pos; // Where to patch.
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uint64_t *D; // Pointer to an array of source data.
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int N; // Number of elements in \c D array.
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};
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namespace llvm {
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// A wrapper class to abstract writer stream with support of bytes
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// back patching.
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class ProfOStream {
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public:
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ProfOStream(raw_fd_ostream &FD)
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: IsFDOStream(true), OS(FD), LE(FD, support::little) {}
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ProfOStream(raw_string_ostream &STR)
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: IsFDOStream(false), OS(STR), LE(STR, support::little) {}
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uint64_t tell() { return OS.tell(); }
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void write(uint64_t V) { LE.write<uint64_t>(V); }
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// \c patch can only be called when all data is written and flushed.
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// For raw_string_ostream, the patch is done on the target string
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// directly and it won't be reflected in the stream's internal buffer.
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void patch(PatchItem *P, int NItems) {
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using namespace support;
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if (IsFDOStream) {
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raw_fd_ostream &FDOStream = static_cast<raw_fd_ostream &>(OS);
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for (int K = 0; K < NItems; K++) {
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FDOStream.seek(P[K].Pos);
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for (int I = 0; I < P[K].N; I++)
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write(P[K].D[I]);
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}
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} else {
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raw_string_ostream &SOStream = static_cast<raw_string_ostream &>(OS);
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std::string &Data = SOStream.str(); // with flush
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for (int K = 0; K < NItems; K++) {
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for (int I = 0; I < P[K].N; I++) {
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uint64_t Bytes = endian::byte_swap<uint64_t, little>(P[K].D[I]);
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Data.replace(P[K].Pos + I * sizeof(uint64_t), sizeof(uint64_t),
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(const char *)&Bytes, sizeof(uint64_t));
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}
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}
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}
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}
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// If \c OS is an instance of \c raw_fd_ostream, this field will be
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// true. Otherwise, \c OS will be an raw_string_ostream.
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bool IsFDOStream;
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raw_ostream &OS;
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support::endian::Writer LE;
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};
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class InstrProfRecordWriterTrait {
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public:
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using key_type = StringRef;
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using key_type_ref = StringRef;
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using data_type = const InstrProfWriter::ProfilingData *const;
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using data_type_ref = const InstrProfWriter::ProfilingData *const;
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using hash_value_type = uint64_t;
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using offset_type = uint64_t;
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support::endianness ValueProfDataEndianness = support::little;
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InstrProfSummaryBuilder *SummaryBuilder;
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InstrProfSummaryBuilder *CSSummaryBuilder;
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InstrProfRecordWriterTrait() = default;
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static hash_value_type ComputeHash(key_type_ref K) {
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return IndexedInstrProf::ComputeHash(K);
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}
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static std::pair<offset_type, offset_type>
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EmitKeyDataLength(raw_ostream &Out, key_type_ref K, data_type_ref V) {
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using namespace support;
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endian::Writer LE(Out, little);
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offset_type N = K.size();
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LE.write<offset_type>(N);
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offset_type M = 0;
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for (const auto &ProfileData : *V) {
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const InstrProfRecord &ProfRecord = ProfileData.second;
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M += sizeof(uint64_t); // The function hash
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M += sizeof(uint64_t); // The size of the Counts vector
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M += ProfRecord.Counts.size() * sizeof(uint64_t);
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// Value data
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M += ValueProfData::getSize(ProfileData.second);
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}
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LE.write<offset_type>(M);
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return std::make_pair(N, M);
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}
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void EmitKey(raw_ostream &Out, key_type_ref K, offset_type N) {
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Out.write(K.data(), N);
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}
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void EmitData(raw_ostream &Out, key_type_ref, data_type_ref V, offset_type) {
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using namespace support;
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endian::Writer LE(Out, little);
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for (const auto &ProfileData : *V) {
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const InstrProfRecord &ProfRecord = ProfileData.second;
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if (NamedInstrProfRecord::hasCSFlagInHash(ProfileData.first))
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CSSummaryBuilder->addRecord(ProfRecord);
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else
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SummaryBuilder->addRecord(ProfRecord);
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LE.write<uint64_t>(ProfileData.first); // Function hash
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LE.write<uint64_t>(ProfRecord.Counts.size());
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for (uint64_t I : ProfRecord.Counts)
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LE.write<uint64_t>(I);
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// Write value data
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std::unique_ptr<ValueProfData> VDataPtr =
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ValueProfData::serializeFrom(ProfileData.second);
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uint32_t S = VDataPtr->getSize();
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VDataPtr->swapBytesFromHost(ValueProfDataEndianness);
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Out.write((const char *)VDataPtr.get(), S);
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}
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}
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};
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} // end namespace llvm
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InstrProfWriter::InstrProfWriter(bool Sparse)
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: Sparse(Sparse), InfoObj(new InstrProfRecordWriterTrait()) {}
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InstrProfWriter::~InstrProfWriter() { delete InfoObj; }
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// Internal interface for testing purpose only.
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void InstrProfWriter::setValueProfDataEndianness(
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support::endianness Endianness) {
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InfoObj->ValueProfDataEndianness = Endianness;
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}
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void InstrProfWriter::setOutputSparse(bool Sparse) {
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this->Sparse = Sparse;
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}
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void InstrProfWriter::addRecord(NamedInstrProfRecord &&I, uint64_t Weight,
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function_ref<void(Error)> Warn) {
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auto Name = I.Name;
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auto Hash = I.Hash;
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addRecord(Name, Hash, std::move(I), Weight, Warn);
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}
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void InstrProfWriter::overlapRecord(NamedInstrProfRecord &&Other,
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OverlapStats &Overlap,
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OverlapStats &FuncLevelOverlap,
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const OverlapFuncFilters &FuncFilter) {
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auto Name = Other.Name;
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auto Hash = Other.Hash;
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Other.accumuateCounts(FuncLevelOverlap.Test);
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if (FunctionData.find(Name) == FunctionData.end()) {
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Overlap.addOneUnique(FuncLevelOverlap.Test);
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return;
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}
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if (FuncLevelOverlap.Test.CountSum < 1.0f) {
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Overlap.Overlap.NumEntries += 1;
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return;
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}
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auto &ProfileDataMap = FunctionData[Name];
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bool NewFunc;
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ProfilingData::iterator Where;
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std::tie(Where, NewFunc) =
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ProfileDataMap.insert(std::make_pair(Hash, InstrProfRecord()));
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if (NewFunc) {
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Overlap.addOneMismatch(FuncLevelOverlap.Test);
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return;
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}
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InstrProfRecord &Dest = Where->second;
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uint64_t ValueCutoff = FuncFilter.ValueCutoff;
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if (!FuncFilter.NameFilter.empty() &&
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Name.find(FuncFilter.NameFilter) != Name.npos)
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ValueCutoff = 0;
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Dest.overlap(Other, Overlap, FuncLevelOverlap, ValueCutoff);
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}
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void InstrProfWriter::addRecord(StringRef Name, uint64_t Hash,
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InstrProfRecord &&I, uint64_t Weight,
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function_ref<void(Error)> Warn) {
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auto &ProfileDataMap = FunctionData[Name];
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bool NewFunc;
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ProfilingData::iterator Where;
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std::tie(Where, NewFunc) =
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ProfileDataMap.insert(std::make_pair(Hash, InstrProfRecord()));
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InstrProfRecord &Dest = Where->second;
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auto MapWarn = [&](instrprof_error E) {
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Warn(make_error<InstrProfError>(E));
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};
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if (NewFunc) {
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// We've never seen a function with this name and hash, add it.
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Dest = std::move(I);
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if (Weight > 1)
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Dest.scale(Weight, MapWarn);
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} else {
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// We're updating a function we've seen before.
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Dest.merge(I, Weight, MapWarn);
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}
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Dest.sortValueData();
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}
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void InstrProfWriter::mergeRecordsFromWriter(InstrProfWriter &&IPW,
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function_ref<void(Error)> Warn) {
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for (auto &I : IPW.FunctionData)
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for (auto &Func : I.getValue())
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addRecord(I.getKey(), Func.first, std::move(Func.second), 1, Warn);
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}
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bool InstrProfWriter::shouldEncodeData(const ProfilingData &PD) {
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if (!Sparse)
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return true;
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for (const auto &Func : PD) {
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const InstrProfRecord &IPR = Func.second;
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if (llvm::any_of(IPR.Counts, [](uint64_t Count) { return Count > 0; }))
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return true;
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}
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return false;
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}
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static void setSummary(IndexedInstrProf::Summary *TheSummary,
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ProfileSummary &PS) {
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using namespace IndexedInstrProf;
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std::vector<ProfileSummaryEntry> &Res = PS.getDetailedSummary();
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TheSummary->NumSummaryFields = Summary::NumKinds;
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TheSummary->NumCutoffEntries = Res.size();
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TheSummary->set(Summary::MaxFunctionCount, PS.getMaxFunctionCount());
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TheSummary->set(Summary::MaxBlockCount, PS.getMaxCount());
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TheSummary->set(Summary::MaxInternalBlockCount, PS.getMaxInternalCount());
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TheSummary->set(Summary::TotalBlockCount, PS.getTotalCount());
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TheSummary->set(Summary::TotalNumBlocks, PS.getNumCounts());
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TheSummary->set(Summary::TotalNumFunctions, PS.getNumFunctions());
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for (unsigned I = 0; I < Res.size(); I++)
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TheSummary->setEntry(I, Res[I]);
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}
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void InstrProfWriter::writeImpl(ProfOStream &OS) {
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using namespace IndexedInstrProf;
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OnDiskChainedHashTableGenerator<InstrProfRecordWriterTrait> Generator;
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InstrProfSummaryBuilder ISB(ProfileSummaryBuilder::DefaultCutoffs);
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InfoObj->SummaryBuilder = &ISB;
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InstrProfSummaryBuilder CSISB(ProfileSummaryBuilder::DefaultCutoffs);
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InfoObj->CSSummaryBuilder = &CSISB;
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// Populate the hash table generator.
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for (const auto &I : FunctionData)
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if (shouldEncodeData(I.getValue()))
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Generator.insert(I.getKey(), &I.getValue());
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// Write the header.
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IndexedInstrProf::Header Header;
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Header.Magic = IndexedInstrProf::Magic;
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Header.Version = IndexedInstrProf::ProfVersion::CurrentVersion;
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if (ProfileKind == PF_IRLevel)
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Header.Version |= VARIANT_MASK_IR_PROF;
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if (ProfileKind == PF_IRLevelWithCS) {
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Header.Version |= VARIANT_MASK_IR_PROF;
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Header.Version |= VARIANT_MASK_CSIR_PROF;
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}
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Header.Unused = 0;
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Header.HashType = static_cast<uint64_t>(IndexedInstrProf::HashType);
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Header.HashOffset = 0;
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int N = sizeof(IndexedInstrProf::Header) / sizeof(uint64_t);
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// Only write out all the fields except 'HashOffset'. We need
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// to remember the offset of that field to allow back patching
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// later.
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for (int I = 0; I < N - 1; I++)
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OS.write(reinterpret_cast<uint64_t *>(&Header)[I]);
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// Save the location of Header.HashOffset field in \c OS.
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uint64_t HashTableStartFieldOffset = OS.tell();
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// Reserve the space for HashOffset field.
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OS.write(0);
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// Reserve space to write profile summary data.
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uint32_t NumEntries = ProfileSummaryBuilder::DefaultCutoffs.size();
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uint32_t SummarySize = Summary::getSize(Summary::NumKinds, NumEntries);
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// Remember the summary offset.
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uint64_t SummaryOffset = OS.tell();
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for (unsigned I = 0; I < SummarySize / sizeof(uint64_t); I++)
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OS.write(0);
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uint64_t CSSummaryOffset = 0;
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uint64_t CSSummarySize = 0;
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if (ProfileKind == PF_IRLevelWithCS) {
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CSSummaryOffset = OS.tell();
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CSSummarySize = SummarySize / sizeof(uint64_t);
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for (unsigned I = 0; I < CSSummarySize; I++)
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OS.write(0);
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}
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// Write the hash table.
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uint64_t HashTableStart = Generator.Emit(OS.OS, *InfoObj);
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// Allocate space for data to be serialized out.
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std::unique_ptr<IndexedInstrProf::Summary> TheSummary =
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IndexedInstrProf::allocSummary(SummarySize);
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// Compute the Summary and copy the data to the data
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// structure to be serialized out (to disk or buffer).
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std::unique_ptr<ProfileSummary> PS = ISB.getSummary();
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setSummary(TheSummary.get(), *PS);
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InfoObj->SummaryBuilder = nullptr;
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// For Context Sensitive summary.
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std::unique_ptr<IndexedInstrProf::Summary> TheCSSummary = nullptr;
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if (ProfileKind == PF_IRLevelWithCS) {
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TheCSSummary = IndexedInstrProf::allocSummary(SummarySize);
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std::unique_ptr<ProfileSummary> CSPS = CSISB.getSummary();
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setSummary(TheCSSummary.get(), *CSPS);
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}
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InfoObj->CSSummaryBuilder = nullptr;
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// Now do the final patch:
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PatchItem PatchItems[] = {
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// Patch the Header.HashOffset field.
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{HashTableStartFieldOffset, &HashTableStart, 1},
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// Patch the summary data.
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{SummaryOffset, reinterpret_cast<uint64_t *>(TheSummary.get()),
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(int)(SummarySize / sizeof(uint64_t))},
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{CSSummaryOffset, reinterpret_cast<uint64_t *>(TheCSSummary.get()),
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(int)CSSummarySize}};
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OS.patch(PatchItems, sizeof(PatchItems) / sizeof(*PatchItems));
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}
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void InstrProfWriter::write(raw_fd_ostream &OS) {
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// Write the hash table.
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ProfOStream POS(OS);
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writeImpl(POS);
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}
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std::unique_ptr<MemoryBuffer> InstrProfWriter::writeBuffer() {
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std::string Data;
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raw_string_ostream OS(Data);
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ProfOStream POS(OS);
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// Write the hash table.
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writeImpl(POS);
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// Return this in an aligned memory buffer.
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return MemoryBuffer::getMemBufferCopy(Data);
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}
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static const char *ValueProfKindStr[] = {
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#define VALUE_PROF_KIND(Enumerator, Value, Descr) #Enumerator,
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#include "llvm/ProfileData/InstrProfData.inc"
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};
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void InstrProfWriter::writeRecordInText(StringRef Name, uint64_t Hash,
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const InstrProfRecord &Func,
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InstrProfSymtab &Symtab,
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raw_fd_ostream &OS) {
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OS << Name << "\n";
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OS << "# Func Hash:\n" << Hash << "\n";
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OS << "# Num Counters:\n" << Func.Counts.size() << "\n";
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OS << "# Counter Values:\n";
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for (uint64_t Count : Func.Counts)
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OS << Count << "\n";
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uint32_t NumValueKinds = Func.getNumValueKinds();
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if (!NumValueKinds) {
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OS << "\n";
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return;
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}
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OS << "# Num Value Kinds:\n" << Func.getNumValueKinds() << "\n";
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for (uint32_t VK = 0; VK < IPVK_Last + 1; VK++) {
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uint32_t NS = Func.getNumValueSites(VK);
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if (!NS)
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continue;
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OS << "# ValueKind = " << ValueProfKindStr[VK] << ":\n" << VK << "\n";
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OS << "# NumValueSites:\n" << NS << "\n";
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for (uint32_t S = 0; S < NS; S++) {
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uint32_t ND = Func.getNumValueDataForSite(VK, S);
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OS << ND << "\n";
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std::unique_ptr<InstrProfValueData[]> VD = Func.getValueForSite(VK, S);
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for (uint32_t I = 0; I < ND; I++) {
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if (VK == IPVK_IndirectCallTarget)
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OS << Symtab.getFuncNameOrExternalSymbol(VD[I].Value) << ":"
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<< VD[I].Count << "\n";
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else
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OS << VD[I].Value << ":" << VD[I].Count << "\n";
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}
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}
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}
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OS << "\n";
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}
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Error InstrProfWriter::writeText(raw_fd_ostream &OS) {
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if (ProfileKind == PF_IRLevel)
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OS << "# IR level Instrumentation Flag\n:ir\n";
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else if (ProfileKind == PF_IRLevelWithCS)
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OS << "# CSIR level Instrumentation Flag\n:csir\n";
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InstrProfSymtab Symtab;
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using FuncPair = detail::DenseMapPair<uint64_t, InstrProfRecord>;
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using RecordType = std::pair<StringRef, FuncPair>;
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SmallVector<RecordType, 4> OrderedFuncData;
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for (const auto &I : FunctionData) {
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if (shouldEncodeData(I.getValue())) {
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if (Error E = Symtab.addFuncName(I.getKey()))
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return E;
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for (const auto &Func : I.getValue())
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OrderedFuncData.push_back(std::make_pair(I.getKey(), Func));
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}
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}
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llvm::sort(OrderedFuncData, [](const RecordType &A, const RecordType &B) {
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return std::tie(A.first, A.second.first) <
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std::tie(B.first, B.second.first);
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});
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for (const auto &record : OrderedFuncData) {
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const StringRef &Name = record.first;
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const FuncPair &Func = record.second;
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writeRecordInText(Name, Func.first, Func.second, Symtab, OS);
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}
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return Error::success();
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}
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