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128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
//=-- InstrProfWriter.cpp - Instrumented profiling writer -------------------=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/StringExtras.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/OnDiskHashTable.h"
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#include "InstrProfIndexed.h"
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using namespace llvm;
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namespace {
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class InstrProfRecordTrait {
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public:
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typedef StringRef key_type;
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typedef StringRef key_type_ref;
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typedef const InstrProfWriter::CounterData *const data_type;
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typedef const InstrProfWriter::CounterData *const data_type_ref;
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typedef uint64_t hash_value_type;
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typedef uint64_t offset_type;
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static hash_value_type ComputeHash(key_type_ref K) {
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return IndexedInstrProf::ComputeHash(IndexedInstrProf::HashType, 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 llvm::support;
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endian::Writer<little> LE(Out);
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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 = (1 + V->Counts.size()) * sizeof(uint64_t);
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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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static 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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static void EmitData(raw_ostream &Out, key_type_ref, data_type_ref V,
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offset_type) {
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using namespace llvm::support;
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endian::Writer<little> LE(Out);
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LE.write<uint64_t>(V->Hash);
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for (uint64_t I : V->Counts)
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LE.write<uint64_t>(I);
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}
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};
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}
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std::error_code
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InstrProfWriter::addFunctionCounts(StringRef FunctionName,
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uint64_t FunctionHash,
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ArrayRef<uint64_t> Counters) {
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auto Where = FunctionData.find(FunctionName);
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if (Where == FunctionData.end()) {
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// If this is the first time we've seen this function, just add it.
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auto &Data = FunctionData[FunctionName];
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Data.Hash = FunctionHash;
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Data.Counts = Counters;
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return instrprof_error::success;
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}
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auto &Data = Where->getValue();
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// We can only add to existing functions if they match, so we check the hash
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// and number of counters.
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if (Data.Hash != FunctionHash)
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return instrprof_error::hash_mismatch;
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if (Data.Counts.size() != Counters.size())
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return instrprof_error::count_mismatch;
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// These match, add up the counters.
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for (size_t I = 0, E = Counters.size(); I < E; ++I) {
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if (Data.Counts[I] + Counters[I] < Data.Counts[I])
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return instrprof_error::counter_overflow;
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Data.Counts[I] += Counters[I];
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}
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return instrprof_error::success;
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}
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void InstrProfWriter::write(raw_fd_ostream &OS) {
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OnDiskChainedHashTableGenerator<InstrProfRecordTrait> Generator;
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uint64_t MaxFunctionCount = 0;
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// Populate the hash table generator.
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for (const auto &I : FunctionData) {
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Generator.insert(I.getKey(), &I.getValue());
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if (I.getValue().Counts[0] > MaxFunctionCount)
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MaxFunctionCount = I.getValue().Counts[0];
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}
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using namespace llvm::support;
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endian::Writer<little> LE(OS);
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// Write the header.
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LE.write<uint64_t>(IndexedInstrProf::Magic);
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LE.write<uint64_t>(IndexedInstrProf::Version);
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LE.write<uint64_t>(MaxFunctionCount);
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LE.write<uint64_t>(static_cast<uint64_t>(IndexedInstrProf::HashType));
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// Save a space to write the hash table start location.
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uint64_t HashTableStartLoc = OS.tell();
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LE.write<uint64_t>(0);
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// Write the hash table.
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uint64_t HashTableStart = Generator.Emit(OS);
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// Go back and fill in the hash table start.
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OS.seek(HashTableStartLoc);
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LE.write<uint64_t>(HashTableStart);
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}
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