diff options
Diffstat (limited to 'lib/Profile/ProfileDataWriter.cpp')
-rw-r--r-- | lib/Profile/ProfileDataWriter.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/Profile/ProfileDataWriter.cpp b/lib/Profile/ProfileDataWriter.cpp new file mode 100644 index 0000000000..b5993dd45e --- /dev/null +++ b/lib/Profile/ProfileDataWriter.cpp @@ -0,0 +1,71 @@ +//=-- ProfileDataWriter.cpp - Instrumented profiling writer -----------------=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains support for writing profiling data for clang's +// instrumentation based PGO and coverage. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Profile/ProfileDataWriter.h" +#include "llvm/Profile/ProfileData.h" +#include "llvm/Support/Endian.h" + +using namespace llvm; + +template <typename T> +struct LEBytes { + const T &Data; + LEBytes(const T &Data) : Data(Data) {} + void print(raw_ostream &OS) const { + for (uint32_t Shift = 0; Shift < sizeof(Data); ++Shift) + OS << (char)((Data >> (8 * Shift)) & 0xFF); + } +}; +template <typename T> +static raw_ostream &operator<<(raw_ostream &OS, const LEBytes<T> &Bytes) { + Bytes.print(OS); + return OS; +} + +void ProfileDataWriter::addFunctionCounts(StringRef FuncName, + uint64_t FunctionHash, + uint64_t NumCounters, + const uint64_t *Counters) { + DataStart += 2 * sizeof(uint32_t) + FuncName.size(); + FunctionOffsets[FuncName] = FunctionData.size() * sizeof(uint64_t); + FunctionData.push_back(FunctionHash); + FunctionData.push_back(NumCounters); + assert(NumCounters > 0 && "Function call counter missing!"); + if (Counters[0] > MaxFunctionCount) + MaxFunctionCount = Counters[0]; + for (uint64_t I = 0; I < NumCounters; ++I) + FunctionData.push_back(Counters[I]); +} + +void ProfileDataWriter::write(raw_ostream &OS) { + for (char C : PROFILEDATA_MAGIC) + OS << C; + OS << LEBytes<uint32_t>(PROFILEDATA_VERSION); + OS << LEBytes<uint32_t>(DataStart); + OS << LEBytes<uint32_t>(0); + OS << LEBytes<uint64_t>(MaxFunctionCount); + + for (const auto &I : FunctionOffsets) { + StringRef Name = I.getKey(); + OS << LEBytes<uint32_t>(Name.size()); + OS << Name; + OS << LEBytes<uint32_t>(I.getValue()); + } + + for (unsigned I = 0; I < sizeof(uint64_t) - DataStart % sizeof(uint64_t); ++I) + OS << '\0'; + + for (uint64_t Value : FunctionData) + OS << LEBytes<uint64_t>(Value); +} |