+instrprof_error InstrProfRecord::merge(InstrProfRecord &Other) {
+ // If the number of counters doesn't match we either have bad data
+ // or a hash collision.
+ if (Counts.size() != Other.Counts.size())
+ return instrprof_error::count_mismatch;
+
+ for (size_t I = 0, E = Other.Counts.size(); I < E; ++I) {
+ if (Counts[I] + Other.Counts[I] < Counts[I])
+ return instrprof_error::counter_overflow;
+ Counts[I] += Other.Counts[I];
+ }
+
+ for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind) {
+ instrprof_error result = mergeValueProfData(Kind, Other);
+ if (result != instrprof_error::success)
+ return result;
+ }
+
+ return instrprof_error::success;
+}
+
+inline support::endianness getHostEndianness() {
+ return sys::IsLittleEndianHost ? support::little : support::big;
+}
+
+/// Return the \c ValueProfRecord header size including the padding bytes.
+uint32_t getValueProfRecordHeaderSize(uint32_t NumValueSites);
+/// Return the total size of the value profile record including the
+/// header and the value data.
+uint32_t getValueProfRecordSize(uint32_t NumValueSites, uint32_t NumValueData);
+
+/// 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.
+typedef 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 total size of the value profile record including the
+ /// header and the value data.
+ uint32_t getSize() const {
+ return getValueProfRecordSize(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);
+} ValueProfRecord;
+
+/// Per-function header/control data structure for value profiling
+/// data in indexed format.
+typedef 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 implementation 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();
+} ValueProfData;
+
+typedef struct ValueProfRecordClosure {
+ void *Record;
+ uint32_t (*GetNumValueKinds)(void *Record);
+ uint32_t (*GetNumValueSites)(void *Record, uint32_t VKind);
+ uint32_t (*GetNumValueData)(void *Record, uint32_t VKind);
+ uint32_t (*GetNumValueDataForSite)(void *R, uint32_t VK, uint32_t S);
+ uint64_t (*RemapValueData)(uint64_t Value);
+ void (*GetValueForSite)(InstrProfValueData Dst[], void *R, uint32_t K,
+ uint32_t S);
+ ValueProfData *(*AllocateValueProfData)(size_t TotalSizeInBytes);
+} ValueProfRecordClosure;
+
+inline uint32_t getValueProfRecordHeaderSize(uint32_t NumValueSites) {
+ uint32_t Size = offsetof(ValueProfRecord, SiteCountArray) +
+ sizeof(uint8_t) * NumValueSites;
+ // Round the size to multiple of 8 bytes.
+ Size = (Size + 7) & ~7;
+ return Size;
+}
+
+inline uint32_t getValueProfRecordSize(uint32_t NumValueSites,
+ uint32_t NumValueData) {
+ return getValueProfRecordHeaderSize(NumValueSites) +
+ sizeof(InstrProfValueData) * NumValueData;
+}
+