Revert "InstrProf: When reading, copy the data instead of taking a reference. NFC"

[oota-llvm.git] / include / llvm / ProfileData / InstrProfReader.h

diff --git a/include/llvm/ProfileData/InstrProfReader.h b/include/llvm/ProfileData/InstrProfReader.h
index f937e7d08d5444ceec42a63c64c72563fa906c6b..63a6ac671f2bd3609df73eb17cb20a995043a8e1 100644 (file)
--- a/include/llvm/ProfileData/InstrProfReader.h
+++ b/include/llvm/ProfileData/InstrProfReader.h
@@ -29,6 +29,16 @@ namespace llvm {
 
 class InstrProfReader;
 
+/// Profiling information for a single function.
+struct InstrProfRecord {
+  InstrProfRecord() {}
+  InstrProfRecord(StringRef Name, uint64_t Hash, ArrayRef<uint64_t> Counts)
+      : Name(Name), Hash(Hash), Counts(Counts) {}
+  StringRef Name;
+  uint64_t Hash;
+  ArrayRef<uint64_t> Counts;
+};
+
 /// A file format agnostic iterator over profiling data.
 class InstrProfIterator : public std::iterator<std::input_iterator_tag,
                                                InstrProfRecord> {
@@ -104,6 +114,8 @@ private:
   std::unique_ptr<MemoryBuffer> DataBuffer;
   /// Iterator over the profile data.
   line_iterator Line;
+  /// The current set of counter values.
+  std::vector<uint64_t> Counts;
 
   TextInstrProfReader(const TextInstrProfReader &) = delete;
   TextInstrProfReader &operator=(const TextInstrProfReader &) = delete;
@@ -129,6 +141,8 @@ class RawInstrProfReader : public InstrProfReader {
 private:
   /// The profile data file contents.
   std::unique_ptr<MemoryBuffer> DataBuffer;
+  /// The current set of counter values.
+  std::vector<uint64_t> Counts;
   struct ProfileData {
     const uint32_t NameSize;
     const uint32_t NumCounters;
@@ -192,16 +206,17 @@ enum class HashT : uint32_t;
 /// Trait for lookups into the on-disk hash table for the binary instrprof
 /// format.
 class InstrProfLookupTrait {
-  std::vector<InstrProfRecord> DataBuffer;
+  std::vector<uint64_t> DataBuffer;
   IndexedInstrProf::HashT HashType;
-  unsigned FormatVersion;
-
 public:
-  InstrProfLookupTrait(IndexedInstrProf::HashT HashType, unsigned FormatVersion)
-      : HashType(HashType), FormatVersion(FormatVersion) {}
-
-  typedef ArrayRef<InstrProfRecord> data_type;
+  InstrProfLookupTrait(IndexedInstrProf::HashT HashType) : HashType(HashType) {}
 
+  struct data_type {
+    data_type(StringRef Name, ArrayRef<uint64_t> Data)
+        : Name(Name), Data(Data) {}
+    StringRef Name;
+    ArrayRef<uint64_t> Data;
+  };
   typedef StringRef internal_key_type;
   typedef StringRef external_key_type;
   typedef uint64_t hash_value_type;
@@ -224,9 +239,22 @@ public:
     return StringRef((const char *)D, N);
   }
 
-  data_type ReadData(StringRef K, const unsigned char *D, offset_type N);
-};
+  data_type ReadData(StringRef K, const unsigned char *D, offset_type N) {
+    DataBuffer.clear();
+    if (N % sizeof(uint64_t))
+      // The data is corrupt, don't try to read it.
+      return data_type("", DataBuffer);
 
+    using namespace support;
+    // We just treat the data as opaque here. It's simpler to handle in
+    // IndexedInstrProfReader.
+    unsigned NumEntries = N / sizeof(uint64_t);
+    DataBuffer.reserve(NumEntries);
+    for (unsigned I = 0; I < NumEntries; ++I)
+      DataBuffer.push_back(endian::readNext<uint64_t, little, unaligned>(D));
+    return data_type(K, DataBuffer);
+  }
+};
 typedef OnDiskIterableChainedHashTable<InstrProfLookupTrait>
     InstrProfReaderIndex;
 
@@ -239,6 +267,8 @@ private:
   std::unique_ptr<InstrProfReaderIndex> Index;
   /// Iterator over the profile data.
   InstrProfReaderIndex::data_iterator RecordIterator;
+  /// Offset into our current data set.
+  size_t CurrentOffset;
   /// The file format version of the profile data.
   uint64_t FormatVersion;
   /// The maximal execution count among all functions.
@@ -248,7 +278,7 @@ private:
   IndexedInstrProfReader &operator=(const IndexedInstrProfReader &) = delete;
 public:
   IndexedInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer)
-      : DataBuffer(std::move(DataBuffer)), Index(nullptr) {}
+      : DataBuffer(std::move(DataBuffer)), Index(nullptr), CurrentOffset(0) {}
 
   /// Return true if the given buffer is in an indexed instrprof format.
   static bool hasFormat(const MemoryBuffer &DataBuffer);