Re-apply "InstrProf: Add unit tests for the profile reader and writer"

[oota-llvm.git] / lib / ProfileData / InstrProfWriter.cpp

diff --git a/lib/ProfileData/InstrProfWriter.cpp b/lib/ProfileData/InstrProfWriter.cpp
index d4cde2e195de24ccfd6d6b15aeb9fecb8f8a1ec8..2c72efe3faa92fcd79667e4fef38afdb449f8b07 100644 (file)
--- a/lib/ProfileData/InstrProfWriter.cpp
+++ b/lib/ProfileData/InstrProfWriter.cpp
@@ -106,7 +106,7 @@ InstrProfWriter::addFunctionCounts(StringRef FunctionName,
   return instrprof_error::success;
 }
 
-void InstrProfWriter::write(raw_fd_ostream &OS) {
+std::pair<uint64_t, uint64_t> InstrProfWriter::writeImpl(raw_ostream &OS) {
   OnDiskChainedHashTableGenerator<InstrProfRecordTrait> Generator;
 
   // Populate the hash table generator.
@@ -128,7 +128,31 @@ void InstrProfWriter::write(raw_fd_ostream &OS) {
   // Write the hash table.
   uint64_t HashTableStart = Generator.Emit(OS);
 
+  return std::make_pair(HashTableStartLoc, HashTableStart);
+}
+
+void InstrProfWriter::write(raw_fd_ostream &OS) {
+  // Write the hash table.
+  auto TableStart = writeImpl(OS);
+
   // Go back and fill in the hash table start.
-  OS.seek(HashTableStartLoc);
-  LE.write<uint64_t>(HashTableStart);
+  using namespace support;
+  OS.seek(TableStart.first);
+  endian::Writer<little>(OS).write<uint64_t>(TableStart.second);
+}
+
+std::string InstrProfWriter::writeString() {
+  std::string Result;
+  llvm::raw_string_ostream OS(Result);
+  // Write the hash table.
+  auto TableStart = writeImpl(OS);
+  OS.flush();
+
+  // Go back and fill in the hash table start.
+  using namespace support;
+  uint64_t Bytes = endian::byte_swap<uint64_t, little>(TableStart.second);
+  Result.replace(TableStart.first, sizeof(uint64_t), (const char *)&Bytes,
+                 sizeof(uint64_t));
+
+  return Result;
 }