//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/InstrProfWriter.h"
-#include "llvm/Support/Endian.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/EndianStream.h"
+#include "llvm/Support/OnDiskHashTable.h"
using namespace llvm;
-error_code InstrProfWriter::addFunctionCounts(StringRef FunctionName,
- uint64_t FunctionHash,
- ArrayRef<uint64_t> Counters) {
- auto Where = FunctionData.find(FunctionName);
- if (Where == FunctionData.end()) {
- // If this is the first time we've seen this function, just add it.
- FunctionData[FunctionName] = {FunctionHash, Counters};
- return instrprof_error::success;;
+namespace {
+static support::endianness ValueProfDataEndianness = support::little;
+
+class InstrProfRecordTrait {
+public:
+ typedef StringRef key_type;
+ typedef StringRef key_type_ref;
+
+ typedef const InstrProfWriter::ProfilingData *const data_type;
+ typedef const InstrProfWriter::ProfilingData *const data_type_ref;
+
+ typedef uint64_t hash_value_type;
+ typedef uint64_t offset_type;
+
+ static hash_value_type ComputeHash(key_type_ref K) {
+ return IndexedInstrProf::ComputeHash(IndexedInstrProf::HashType, K);
}
- auto &Data = Where->getValue();
- // We can only add to existing functions if they match, so we check the hash
- // and number of counters.
- if (Data.Hash != FunctionHash)
- return instrprof_error::hash_mismatch;
- if (Data.Counts.size() != Counters.size())
- return instrprof_error::count_mismatch;
- // These match, add up the counters.
- for (size_t I = 0, E = Counters.size(); I < E; ++I) {
- if (Data.Counts[I] + Counters[I] < Data.Counts[I])
- return instrprof_error::counter_overflow;
- Data.Counts[I] += Counters[I];
+ static std::pair<offset_type, offset_type>
+ EmitKeyDataLength(raw_ostream &Out, key_type_ref K, data_type_ref V) {
+ using namespace llvm::support;
+ endian::Writer<little> LE(Out);
+
+ offset_type N = K.size();
+ LE.write<offset_type>(N);
+
+ offset_type M = 0;
+ for (const auto &ProfileData : *V) {
+ const InstrProfRecord &ProfRecord = ProfileData.second;
+ M += sizeof(uint64_t); // The function hash
+ M += sizeof(uint64_t); // The size of the Counts vector
+ M += ProfRecord.Counts.size() * sizeof(uint64_t);
+
+ // Value data
+ M += ValueProfData::getSize(ProfileData.second);
+ }
+ LE.write<offset_type>(M);
+
+ return std::make_pair(N, M);
}
- return instrprof_error::success;
+
+ static void EmitKey(raw_ostream &Out, key_type_ref K, offset_type N){
+ Out.write(K.data(), N);
+ }
+
+ static void EmitData(raw_ostream &Out, key_type_ref, data_type_ref V,
+ offset_type) {
+ using namespace llvm::support;
+ endian::Writer<little> LE(Out);
+ for (const auto &ProfileData : *V) {
+ const InstrProfRecord &ProfRecord = ProfileData.second;
+
+ LE.write<uint64_t>(ProfileData.first); // Function hash
+ LE.write<uint64_t>(ProfRecord.Counts.size());
+ for (uint64_t I : ProfRecord.Counts)
+ LE.write<uint64_t>(I);
+
+ // Write value data
+ std::unique_ptr<ValueProfData> VDataPtr =
+ ValueProfData::serializeFrom(ProfileData.second);
+ uint32_t S = VDataPtr->getSize();
+ VDataPtr->swapBytesFromHost(ValueProfDataEndianness);
+ Out.write((const char *)VDataPtr.get(), S);
+ }
+ }
+};
+}
+
+// Internal interface for testing purpose only.
+void InstrProfWriter::setValueProfDataEndianness(
+ support::endianness Endianness) {
+ ValueProfDataEndianness = Endianness;
+}
+
+void InstrProfWriter::updateStringTableReferences(InstrProfRecord &I) {
+ I.updateStrings(&StringTable);
}
-void InstrProfWriter::write(raw_ostream &OS) {
- // Write out the counts for each function.
- for (const auto &I : FunctionData) {
- StringRef Name = I.getKey();
- uint64_t Hash = I.getValue().Hash;
- const std::vector<uint64_t> &Counts = I.getValue().Counts;
-
- OS << Name << "\n" << Hash << "\n" << Counts.size() << "\n";
- for (uint64_t Count : Counts)
- OS << Count << "\n";
- OS << "\n";
+std::error_code InstrProfWriter::addRecord(InstrProfRecord &&I) {
+ updateStringTableReferences(I);
+ auto &ProfileDataMap = FunctionData[I.Name];
+
+ bool NewFunc;
+ ProfilingData::iterator Where;
+ std::tie(Where, NewFunc) =
+ ProfileDataMap.insert(std::make_pair(I.Hash, InstrProfRecord()));
+ InstrProfRecord &Dest = Where->second;
+ if (NewFunc) {
+ // We've never seen a function with this name and hash, add it.
+ Dest = std::move(I);
+ } else {
+ // We're updating a function we've seen before.
+ instrprof_error MergeResult = Dest.merge(I);
+ if (MergeResult != instrprof_error::success) {
+ return MergeResult;
+ }
}
+
+ // We keep track of the max function count as we go for simplicity.
+ if (Dest.Counts[0] > MaxFunctionCount)
+ MaxFunctionCount = Dest.Counts[0];
+
+ return instrprof_error::success;
+}
+
+std::pair<uint64_t, uint64_t> InstrProfWriter::writeImpl(raw_ostream &OS) {
+ OnDiskChainedHashTableGenerator<InstrProfRecordTrait> Generator;
+
+ // Populate the hash table generator.
+ for (const auto &I : FunctionData)
+ Generator.insert(I.getKey(), &I.getValue());
+
+ using namespace llvm::support;
+ endian::Writer<little> LE(OS);
+
+ // Write the header.
+ IndexedInstrProf::Header Header;
+ Header.Magic = IndexedInstrProf::Magic;
+ Header.Version = IndexedInstrProf::Version;
+ Header.MaxFunctionCount = MaxFunctionCount;
+ Header.HashType = static_cast<uint64_t>(IndexedInstrProf::HashType);
+ Header.HashOffset = 0;
+ int N = sizeof(IndexedInstrProf::Header) / sizeof(uint64_t);
+
+ // Only write out all the fields execpt 'HashOffset'. We need
+ // to remember the offset of that field to allow back patching
+ // later.
+ for (int I = 0; I < N - 1; I++)
+ LE.write<uint64_t>(reinterpret_cast<uint64_t *>(&Header)[I]);
+
+ // Save a space to write the hash table start location.
+ uint64_t HashTableStartLoc = OS.tell();
+ // Reserve the space for HashOffset field.
+ LE.write<uint64_t>(0);
+ // Write the hash table.
+ uint64_t HashTableStart = Generator.Emit(OS);
+
+ return std::make_pair(HashTableStartLoc, HashTableStart);
+}
+
+void InstrProfWriter::write(raw_fd_ostream &OS) {
+ // Write the hash table.
+ auto TableStart = writeImpl(OS);
+
+ // Go back and fill in the hash table start.
+ using namespace support;
+ OS.seek(TableStart.first);
+ // Now patch the HashOffset field previously reserved.
+ endian::Writer<little>(OS).write<uint64_t>(TableStart.second);
+}
+
+std::unique_ptr<MemoryBuffer> InstrProfWriter::writeBuffer() {
+ std::string Data;
+ llvm::raw_string_ostream OS(Data);
+ // Write the hash table.
+ auto TableStart = writeImpl(OS);
+ OS.flush();
+
+ // Go back and fill in the hash table start.
+ using namespace support;
+ uint64_t Bytes = endian::byte_swap<uint64_t, little>(TableStart.second);
+ Data.replace(TableStart.first, sizeof(uint64_t), (const char *)&Bytes,
+ sizeof(uint64_t));
+
+ // Return this in an aligned memory buffer.
+ return MemoryBuffer::getMemBufferCopy(Data);
}
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