[memprof] Remove MemProf format Version 0 (#116442)

This patch removes MemProf format Version 0 now that version 2 and 3
seem to be working well.

I'm not touching version 1 for now because some tests still rely on
version 1.

Note that Version 0 is identical to Version 1 except that the MemProf
section of the indexed format has a MemProf version field.

1 files changed, 0 insertions, 35 deletions

diff --git a/llvm/lib/ProfileData/InstrProfWriter.cpp b/llvm/lib/ProfileData/InstrProfWriter.cpp
index 4560147..47f4635 100644
--- a/llvm/lib/ProfileData/InstrProfWriter.cpp
+++ b/llvm/lib/ProfileData/InstrProfWriter.cpp
@@ -620,39 +620,6 @@ writeMemProfCallStackArray(
   return MemProfCallStackIndexes;
 }
 
-// Write out MemProf Version0 as follows:
-// uint64_t RecordTableOffset = RecordTableGenerator.Emit
-// uint64_t FramePayloadOffset = Offset for the frame payload
-// uint64_t FrameTableOffset = FrameTableGenerator.Emit
-// uint64_t Num schema entries
-// uint64_t Schema entry 0
-// uint64_t Schema entry 1
-// ....
-// uint64_t Schema entry N - 1
-// OnDiskChainedHashTable MemProfRecordData
-// OnDiskChainedHashTable MemProfFrameData
-static Error writeMemProfV0(ProfOStream &OS,
-                            memprof::IndexedMemProfData &MemProfData) {
-  uint64_t HeaderUpdatePos = OS.tell();
-  OS.write(0ULL); // Reserve space for the memprof record table offset.
-  OS.write(0ULL); // Reserve space for the memprof frame payload offset.
-  OS.write(0ULL); // Reserve space for the memprof frame table offset.
-
-  auto Schema = memprof::getFullSchema();
-  writeMemProfSchema(OS, Schema);
-
-  uint64_t RecordTableOffset =
-      writeMemProfRecords(OS, MemProfData.Records, &Schema, memprof::Version0);
-
-  uint64_t FramePayloadOffset = OS.tell();
-  uint64_t FrameTableOffset = writeMemProfFrames(OS, MemProfData.Frames);
-
-  uint64_t Header[] = {RecordTableOffset, FramePayloadOffset, FrameTableOffset};
-  OS.patch({{HeaderUpdatePos, Header}});
-
-  return Error::success();
-}
-
 // Write out MemProf Version1 as follows:
 // uint64_t Version (NEW in V1)
 // uint64_t RecordTableOffset = RecordTableGenerator.Emit
@@ -809,8 +776,6 @@ static Error writeMemProf(ProfOStream &OS,
                           memprof::IndexedVersion MemProfVersionRequested,
                           bool MemProfFullSchema) {
   switch (MemProfVersionRequested) {
-  case memprof::Version0:
-    return writeMemProfV0(OS, MemProfData);
   case memprof::Version1:
     return writeMemProfV1(OS, MemProfData);
   case memprof::Version2: