Remove the very substantial, largely unmaintained legacy PGO

infrastructure.

This was essentially work toward PGO based on a design that had several
flaws, partially dating from a time when LLVM had a different
architecture, and with an effort to modernize it abandoned without being
completed. Since then, it has bitrotted for several years further. The
result is nearly unusable, and isn't helping any of the modern PGO
efforts. Instead, it is getting in the way, adding confusion about PGO
in LLVM and distracting everyone with maintenance on essentially dead
code. Removing it paves the way for modern efforts around PGO.

Among other effects, this removes the last of the runtime libraries from
LLVM. Those are being developed in the separate 'compiler-rt' project
now, with somewhat different licensing specifically more approriate for
runtimes.

llvm-svn: 191835

1 files changed, 0 insertions, 155 deletions

diff --git a/llvm/lib/Analysis/ProfileDataLoader.cpp b/llvm/lib/Analysis/ProfileDataLoader.cpp
deleted file mode 100644
index 3d0a1e2eac9..00000000000
--- a/llvm/lib/Analysis/ProfileDataLoader.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-//===- ProfileDataLoader.cpp - Load profile information from disk ---------===//
-//
-//                      The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// The ProfileDataLoader class is used to load raw profiling data from the dump
-// file.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/ProfileDataLoader.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/Analysis/ProfileDataTypes.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/system_error.h"
-#include <cstdio>
-#include <cstdlib>
-using namespace llvm;
-
-raw_ostream &llvm::operator<<(raw_ostream &O, std::pair<const BasicBlock *,
-                                                        const BasicBlock *> E) {
-  O << "(";
-
-  if (E.first)
-    O << E.first->getName();
-  else
-    O << "0";
-
-  O << ",";
-
-  if (E.second)
-    O << E.second->getName();
-  else
-    O << "0";
-
-  return O << ")";
-}
-
-/// AddCounts - Add 'A' and 'B', accounting for the fact that the value of one
-/// (or both) may not be defined.
-static unsigned AddCounts(unsigned A, unsigned B) {
-  // If either value is undefined, use the other.
-  // Undefined + undefined = undefined.
-  if (A == ProfileDataLoader::Uncounted) return B;
-  if (B == ProfileDataLoader::Uncounted) return A;
-
-  return A + B;
-}
-
-/// ReadProfilingData - Load 'NumEntries' items of type 'T' from file 'F'
-template <typename T>
-static void ReadProfilingData(const char *ToolName, FILE *F,
-                              T *Data, size_t NumEntries) {
-  // Read in the block of data...
-  if (fread(Data, sizeof(T), NumEntries, F) != NumEntries)
-    report_fatal_error(Twine(ToolName) + ": Profiling data truncated");
-}
-
-/// ReadProfilingNumEntries - Read how many entries are in this profiling data
-/// packet.
-static unsigned ReadProfilingNumEntries(const char *ToolName, FILE *F,
-                                        bool ShouldByteSwap) {
-  unsigned Entry;
-  ReadProfilingData<unsigned>(ToolName, F, &Entry, 1);
-  return ShouldByteSwap ? ByteSwap_32(Entry) : Entry;
-}
-
-/// ReadProfilingBlock - Read the number of entries in the next profiling data
-/// packet and then accumulate the entries into 'Data'.
-static void ReadProfilingBlock(const char *ToolName, FILE *F,
-                               bool ShouldByteSwap,
-                               SmallVectorImpl<unsigned> &Data) {
-  // Read the number of entries...
-  unsigned NumEntries = ReadProfilingNumEntries(ToolName, F, ShouldByteSwap);
-
-  // Read in the data.
-  SmallVector<unsigned, 8> TempSpace(NumEntries);
-  ReadProfilingData<unsigned>(ToolName, F, TempSpace.data(), NumEntries);
-
-  // Make sure we have enough space ...
-  if (Data.size() < NumEntries)
-    Data.resize(NumEntries, ProfileDataLoader::Uncounted);
-
-  // Accumulate the data we just read into the existing data.
-  for (unsigned i = 0; i < NumEntries; ++i) {
-    unsigned Entry = ShouldByteSwap ? ByteSwap_32(TempSpace[i]) : TempSpace[i];
-    Data[i] = AddCounts(Entry, Data[i]);
-  }
-}
-
-/// ReadProfilingArgBlock - Read the command line arguments that the progam was
-/// run with when the current profiling data packet(s) were generated.
-static void ReadProfilingArgBlock(const char *ToolName, FILE *F,
-                                  bool ShouldByteSwap,
-                                  SmallVectorImpl<std::string> &CommandLines) {
-  // Read the number of bytes ...
-  unsigned ArgLength = ReadProfilingNumEntries(ToolName, F, ShouldByteSwap);
-
-  // Read in the arguments (if there are any to read).  Round up the length to
-  // the nearest 4-byte multiple.
-  SmallVector<char, 8> Args(ArgLength+4);
-  if (ArgLength)
-    ReadProfilingData<char>(ToolName, F, Args.data(), (ArgLength+3) & ~3);
-
-  // Store the arguments.
-  CommandLines.push_back(std::string(&Args[0], &Args[ArgLength]));
-}
-
-const unsigned ProfileDataLoader::Uncounted = ~0U;
-
-/// ProfileDataLoader ctor - Read the specified profiling data file, reporting
-/// a fatal error if the file is invalid or broken.
-ProfileDataLoader::ProfileDataLoader(const char *ToolName,
-                                     const std::string &Filename)
-  : Filename(Filename) {
-  FILE *F = fopen(Filename.c_str(), "rb");
-  if (F == 0)
-    report_fatal_error(Twine(ToolName) + ": Error opening '" +
-                       Filename + "': ");
-
-  // Keep reading packets until we run out of them.
-  unsigned PacketType;
-  while (fread(&PacketType, sizeof(unsigned), 1, F) == 1) {
-    // If the low eight bits of the packet are zero, we must be dealing with an
-    // endianness mismatch.  Byteswap all words read from the profiling
-    // information.  This can happen when the compiler host and target have
-    // different endianness.
-    bool ShouldByteSwap = (char)PacketType == 0;
-    PacketType = ShouldByteSwap ? ByteSwap_32(PacketType) : PacketType;
-
-    switch (PacketType) {
-      case ArgumentInfo:
-        ReadProfilingArgBlock(ToolName, F, ShouldByteSwap, CommandLines);
-        break;
-
-      case EdgeInfo:
-        ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts);
-        break;
-
-      default:
-        report_fatal_error(std::string(ToolName)
-                           + ": Unknown profiling packet type");
-        break;
-    }
-  }
-
-  fclose(F);
-}