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c6ebba3620
This takes memory usage from 5.1GB to 970MB - it could go further by using a small size of 2 instead of the default of 4, but given the rather high cost of going over this limit by much, I figured a little slosh would be worth the ~130MB of memory usage. & this'll might not be such a big deal if we use a custom slab allocator for the DenseMaps here anyway While the vast majority (99.9%) of records use only 1 entry, the tuning parameter to SmallDenseMap is the the number of buckets, not the number of entries - so a small size of 1 wasn't useful, even for 1 element, it would tip over into allocating (much, 64 slots worth) more space - none of them ended up small. llvm-svn: 307608
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
//===- InstrProfWriter.h - Instrumented profiling writer --------*- C++ -*-===//
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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 instrumentation
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// based PGO and coverage.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PROFILEDATA_INSTRPROFWRITER_H
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#define LLVM_PROFILEDATA_INSTRPROFWRITER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ProfileData/InstrProf.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstdint>
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#include <memory>
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namespace llvm {
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/// Writer for instrumentation based profile data.
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class InstrProfRecordWriterTrait;
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class ProfOStream;
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class raw_fd_ostream;
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class InstrProfWriter {
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public:
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using ProfilingData = SmallDenseMap<uint64_t, InstrProfRecord>;
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enum ProfKind { PF_Unknown = 0, PF_FE, PF_IRLevel };
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private:
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bool Sparse;
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StringMap<ProfilingData> FunctionData;
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ProfKind ProfileKind = PF_Unknown;
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// Use raw pointer here for the incomplete type object.
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InstrProfRecordWriterTrait *InfoObj;
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public:
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InstrProfWriter(bool Sparse = false);
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~InstrProfWriter();
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/// Add function counts for the given function. If there are already counts
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/// for this function and the hash and number of counts match, each counter is
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/// summed. Optionally scale counts by \p Weight.
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void addRecord(NamedInstrProfRecord &&I, uint64_t Weight,
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function_ref<void(Error)> Warn);
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void addRecord(NamedInstrProfRecord &&I, function_ref<void(Error)> Warn) {
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addRecord(std::move(I), 1, Warn);
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}
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/// Merge existing function counts from the given writer.
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void mergeRecordsFromWriter(InstrProfWriter &&IPW,
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function_ref<void(Error)> Warn);
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/// Write the profile to \c OS
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void write(raw_fd_ostream &OS);
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/// Write the profile in text format to \c OS
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Error writeText(raw_fd_ostream &OS);
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/// Write \c Record in text format to \c OS
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static void writeRecordInText(StringRef Name, uint64_t Hash,
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const InstrProfRecord &Counters,
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InstrProfSymtab &Symtab, raw_fd_ostream &OS);
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/// Write the profile, returning the raw data. For testing.
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std::unique_ptr<MemoryBuffer> writeBuffer();
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/// Set the ProfileKind. Report error if mixing FE and IR level profiles.
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Error setIsIRLevelProfile(bool IsIRLevel) {
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if (ProfileKind == PF_Unknown) {
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ProfileKind = IsIRLevel ? PF_IRLevel: PF_FE;
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return Error::success();
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}
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return (IsIRLevel == (ProfileKind == PF_IRLevel))
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? Error::success()
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: make_error<InstrProfError>(
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instrprof_error::unsupported_version);
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}
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// Internal interface for testing purpose only.
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void setValueProfDataEndianness(support::endianness Endianness);
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void setOutputSparse(bool Sparse);
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private:
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void addRecord(StringRef Name, uint64_t Hash, InstrProfRecord &&I,
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uint64_t Weight, function_ref<void(Error)> Warn);
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bool shouldEncodeData(const ProfilingData &PD);
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void writeImpl(ProfOStream &OS);
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};
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} // end namespace llvm
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#endif // LLVM_PROFILEDATA_INSTRPROFWRITER_H
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