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https://github.com/c64scene-ar/llvm-6502.git
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02da814a94
This provides a library to work with the instrumentation based profiling format that is used by clang's -fprofile-instr-* options and by the llvm-profdata tool. This is a binary format, rather than the textual one that's currently in use. The tests are in the subsequent commits that use this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203703 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//=-- ProfileDataWriter.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/Profile/ProfileDataWriter.h"
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#include "llvm/Profile/ProfileData.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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template <typename T>
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struct LEBytes {
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const T &Data;
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LEBytes(const T &Data) : Data(Data) {}
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void print(raw_ostream &OS) const {
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for (uint32_t Shift = 0; Shift < sizeof(Data); ++Shift)
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OS << (char)((Data >> (8 * Shift)) & 0xFF);
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}
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};
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template <typename T>
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static raw_ostream &operator<<(raw_ostream &OS, const LEBytes<T> &Bytes) {
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Bytes.print(OS);
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return OS;
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}
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void ProfileDataWriter::addFunctionCounts(StringRef FuncName,
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uint64_t FunctionHash,
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uint64_t NumCounters,
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const uint64_t *Counters) {
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DataStart += 2 * sizeof(uint32_t) + FuncName.size();
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FunctionOffsets[FuncName] = FunctionData.size() * sizeof(uint64_t);
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FunctionData.push_back(FunctionHash);
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FunctionData.push_back(NumCounters);
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assert(NumCounters > 0 && "Function call counter missing!");
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if (Counters[0] > MaxFunctionCount)
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MaxFunctionCount = Counters[0];
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for (uint64_t I = 0; I < NumCounters; ++I)
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FunctionData.push_back(Counters[I]);
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}
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void ProfileDataWriter::write(raw_ostream &OS) {
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for (char C : PROFILEDATA_MAGIC)
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OS << C;
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OS << LEBytes<uint32_t>(PROFILEDATA_VERSION);
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OS << LEBytes<uint32_t>(DataStart);
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OS << LEBytes<uint32_t>(0);
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OS << LEBytes<uint64_t>(MaxFunctionCount);
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for (const auto &I : FunctionOffsets) {
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StringRef Name = I.getKey();
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OS << LEBytes<uint32_t>(Name.size());
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OS << Name;
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OS << LEBytes<uint32_t>(I.getValue());
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}
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for (unsigned I = 0; I < sizeof(uint64_t) - DataStart % sizeof(uint64_t); ++I)
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OS << '\0';
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for (uint64_t Value : FunctionData)
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OS << LEBytes<uint64_t>(Value);
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}
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