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//=-- MemProfSummary.cpp - MemProf summary support ---------------=//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains MemProf summary support.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/MemProfSummary.h"
using namespace llvm;
using namespace llvm::memprof;
void MemProfSummary::printSummaryYaml(raw_ostream &OS) const {
// For now emit as YAML comments, since they aren't read on input.
OS << "---\n";
OS << "# MemProfSummary:\n";
OS << "# Total contexts: " << NumContexts << "\n";
OS << "# Total cold contexts: " << NumColdContexts << "\n";
OS << "# Total hot contexts: " << NumHotContexts << "\n";
OS << "# Maximum cold context total size: " << MaxColdTotalSize << "\n";
OS << "# Maximum warm context total size: " << MaxWarmTotalSize << "\n";
OS << "# Maximum hot context total size: " << MaxHotTotalSize << "\n";
}
void MemProfSummary::write(ProfOStream &OS) const {
// Write the current number of fields first, which helps enable backwards and
// forwards compatibility (see comment in header).
OS.write32(memprof::MemProfSummary::getNumSummaryFields());
auto StartPos = OS.tell();
(void)StartPos;
OS.write(NumContexts);
OS.write(NumColdContexts);
OS.write(NumHotContexts);
OS.write(MaxColdTotalSize);
OS.write(MaxWarmTotalSize);
OS.write(MaxHotTotalSize);
// Sanity check that the number of fields was kept in sync with actual fields.
assert((OS.tell() - StartPos) / 8 == MemProfSummary::getNumSummaryFields());
}
std::unique_ptr<MemProfSummary>
MemProfSummary::deserialize(const unsigned char *&Ptr) {
auto NumSummaryFields =
support::endian::readNext<uint32_t, llvm::endianness::little>(Ptr);
// The initial version of the summary contains 6 fields. To support backwards
// compatibility with older profiles, if new summary fields are added (until a
// version bump) this code will need to check NumSummaryFields against the
// current value of MemProfSummary::getNumSummaryFields(). If NumSummaryFields
// is lower then default values will need to be filled in for the newer fields
// instead of trying to read them from the profile.
//
// For now, assert that the profile contains at least as many fields as
// expected by the code.
assert(NumSummaryFields >= MemProfSummary::getNumSummaryFields());
auto MemProfSum = std::make_unique<MemProfSummary>(
support::endian::read<uint64_t, llvm::endianness::little>(Ptr),
support::endian::read<uint64_t, llvm::endianness::little>(Ptr + 8),
support::endian::read<uint64_t, llvm::endianness::little>(Ptr + 16),
support::endian::read<uint64_t, llvm::endianness::little>(Ptr + 24),
support::endian::read<uint64_t, llvm::endianness::little>(Ptr + 32),
support::endian::read<uint64_t, llvm::endianness::little>(Ptr + 40));
// Enable forwards compatibility by skipping past any additional fields in the
// profile's summary.
Ptr += NumSummaryFields * sizeof(uint64_t);
return MemProfSum;
}
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