-inline support::endianness getHostEndianness() {
- return sys::IsLittleEndianHost ? support::little : support::big;
-}
-
-/// This is the header of the data structure that defines the on-disk
-/// layout of the value profile data of a particular kind for one function.
-struct ValueProfRecord {
- // The kind of the value profile record.
- uint32_t Kind;
- // The number of value profile sites. It is guaranteed to be non-zero;
- // otherwise the record for this kind won't be emitted.
- uint32_t NumValueSites;
- // The first element of the array that stores the number of profiled
- // values for each value site. The size of the array is NumValueSites.
- // Since NumValueSites is greater than zero, there is at least one
- // element in the array.
- uint8_t SiteCountArray[1];
-
- // The fake declaration is for documentation purpose only.
- // Align the start of next field to be on 8 byte boundaries.
- // uint8_t Padding[X];
-
- // The array of value profile data. The size of the array is the sum
- // of all elements in SiteCountArray[].
- // InstrProfValueData ValueData[];
-
- /// Return the \c ValueProfRecord header size including the padding bytes.
- static uint32_t getHeaderSize(uint32_t NumValueSites);
- /// Return the total size of the value profile record including the
- /// header and the value data.
- static uint32_t getSize(uint32_t NumValueSites, uint32_t NumValueData);
- /// Return the total size of the value profile record including the
- /// header and the value data.
- uint32_t getSize() const { return getSize(NumValueSites, getNumValueData()); }
- /// Use this method to advance to the next \c ValueProfRecord.
- ValueProfRecord *getNext();
- /// Return the pointer to the first value profile data.
- InstrProfValueData *getValueData();
- /// Return the number of value sites.
- uint32_t getNumValueSites() const { return NumValueSites; }
- /// Return the number of value data.
- uint32_t getNumValueData() const;
- /// Read data from this record and save it to Record.
- void deserializeTo(InstrProfRecord &Record,
- InstrProfRecord::ValueMapType *VMap);
- /// Extract data from \c Record and serialize into this instance.
- void serializeFrom(const InstrProfRecord &Record, uint32_t ValueKind,
- uint32_t NumValueSites);
- /// In-place byte swap:
- /// Do byte swap for this instance. \c Old is the original order before
- /// the swap, and \c New is the New byte order.
- void swapBytes(support::endianness Old, support::endianness New);
-};
-
-/// Per-function header/control data structure for value profiling
-/// data in indexed format.
-struct ValueProfData {
- // Total size in bytes including this field. It must be a multiple
- // of sizeof(uint64_t).
- uint32_t TotalSize;
- // The number of value profile kinds that has value profile data.
- // In this implementation, a value profile kind is considered to
- // have profile data if the number of value profile sites for the
- // kind is not zero. More aggressively, the implemnetation can
- // choose to check the actual data value: if none of the value sites
- // has any profiled values, the kind can be skipped.
- uint32_t NumValueKinds;
-
- // Following are a sequence of variable length records. The prefix/header
- // of each record is defined by ValueProfRecord type. The number of
- // records is NumValueKinds.
- // ValueProfRecord Record_1;
- // ValueProfRecord Record_N;
-
- /// Return the total size in bytes of the on-disk value profile data
- /// given the data stored in Record.
- static uint32_t getSize(const InstrProfRecord &Record);
- /// Return a pointer to \c ValueProfData instance ready to be streamed.
- static std::unique_ptr<ValueProfData>
- serializeFrom(const InstrProfRecord &Record);
- /// Return a pointer to \c ValueProfileData instance ready to be read.
- /// All data in the instance are properly byte swapped. The input
- /// data is assumed to be in little endian order.
- static ErrorOr<std::unique_ptr<ValueProfData>>
- getValueProfData(const unsigned char *D, const unsigned char *const BufferEnd,
- support::endianness SrcDataEndianness);
- /// Swap byte order from \c Endianness order to host byte order.
- void swapBytesToHost(support::endianness Endianness);
- /// Swap byte order from host byte order to \c Endianness order.
- void swapBytesFromHost(support::endianness Endianness);
- /// Return the total size of \c ValueProfileData.
- uint32_t getSize() const { return TotalSize; }
- /// Read data from this data and save it to \c Record.
- void deserializeTo(InstrProfRecord &Record,
- InstrProfRecord::ValueMapType *VMap);
- /// Return the first \c ValueProfRecord instance.
- ValueProfRecord *getFirstValueProfRecord();
-};
-
-} // end namespace IndexedInstrProf