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/ProfileInfoLoader.cpp b/llvm/lib/Analysis/ProfileInfoLoader.cpp
deleted file mode 100644
index f1f3e940c93..00000000000
--- a/llvm/lib/Analysis/ProfileInfoLoader.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-//===- ProfileInfoLoad.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 ProfileInfoLoader class is used to load and represent profiling
-// information read in from the dump file.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/ProfileInfoLoader.h"
-#include "llvm/Analysis/ProfileInfoTypes.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cstdio>
-#include <cstdlib>
-using namespace llvm;
-
-// ByteSwap - Byteswap 'Var' if 'Really' is true.
-//
-static inline unsigned ByteSwap(unsigned Var, bool Really) {
-  if (!Really) return Var;
-  return ((Var & (255U<< 0U)) << 24U) |
-         ((Var & (255U<< 8U)) <<  8U) |
-         ((Var & (255U<<16U)) >>  8U) |
-         ((Var & (255U<<24U)) >> 24U);
-}
-
-static unsigned AddCounts(unsigned A, unsigned B) {
-  // If either value is undefined, use the other.
-  if (A == ProfileInfoLoader::Uncounted) return B;
-  if (B == ProfileInfoLoader::Uncounted) return A;
-  return A + B;
-}
-
-static void ReadProfilingBlock(const char *ToolName, FILE *F,
-                               bool ShouldByteSwap,
-                               std::vector<unsigned> &Data) {
-  // Read the number of entries...
-  unsigned NumEntries;
-  if (fread(&NumEntries, sizeof(unsigned), 1, F) != 1) {
-    errs() << ToolName << ": data packet truncated!\n";
-    perror(0);
-    exit(1);
-  }
-  NumEntries = ByteSwap(NumEntries, ShouldByteSwap);
-
-  // Read the counts...
-  std::vector<unsigned> TempSpace(NumEntries);
-
-  // Read in the block of data...
-  if (fread(&TempSpace[0], sizeof(unsigned)*NumEntries, 1, F) != 1) {
-    errs() << ToolName << ": data packet truncated!\n";
-    perror(0);
-    exit(1);
-  }
-
-  // Make sure we have enough space... The space is initialised to -1 to
-  // facitiltate the loading of missing values for OptimalEdgeProfiling.
-  if (Data.size() < NumEntries)
-    Data.resize(NumEntries, ProfileInfoLoader::Uncounted);
-
-  // Accumulate the data we just read into the data.
-  if (!ShouldByteSwap) {
-    for (unsigned i = 0; i != NumEntries; ++i) {
-      Data[i] = AddCounts(TempSpace[i], Data[i]);
-    }
-  } else {
-    for (unsigned i = 0; i != NumEntries; ++i) {
-      Data[i] = AddCounts(ByteSwap(TempSpace[i], true), Data[i]);
-    }
-  }
-}
-
-const unsigned ProfileInfoLoader::Uncounted = ~0U;
-
-// ProfileInfoLoader ctor - Read the specified profiling data file, exiting the
-// program if the file is invalid or broken.
-//
-ProfileInfoLoader::ProfileInfoLoader(const char *ToolName,
-                                     const std::string &Filename)
-  : Filename(Filename) {
-  FILE *F = fopen(Filename.c_str(), "rb");
-  if (F == 0) {
-    errs() << ToolName << ": Error opening '" << Filename << "': ";
-    perror(0);
-    exit(1);
-  }
-
-  // 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.
-    bool ShouldByteSwap = (char)PacketType == 0;
-    PacketType = ByteSwap(PacketType, ShouldByteSwap);
-
-    switch (PacketType) {
-    case ArgumentInfo: {
-      unsigned ArgLength;
-      if (fread(&ArgLength, sizeof(unsigned), 1, F) != 1) {
-        errs() << ToolName << ": arguments packet truncated!\n";
-        perror(0);
-        exit(1);
-      }
-      ArgLength = ByteSwap(ArgLength, ShouldByteSwap);
-
-      // Read in the arguments...
-      std::vector<char> Chars(ArgLength+4);
-
-      if (ArgLength)
-        if (fread(&Chars[0], (ArgLength+3) & ~3, 1, F) != 1) {
-          errs() << ToolName << ": arguments packet truncated!\n";
-          perror(0);
-          exit(1);
-        }
-      CommandLines.push_back(std::string(&Chars[0], &Chars[ArgLength]));
-      break;
-    }
-
-    case FunctionInfo:
-      ReadProfilingBlock(ToolName, F, ShouldByteSwap, FunctionCounts);
-      break;
-
-    case BlockInfo:
-      ReadProfilingBlock(ToolName, F, ShouldByteSwap, BlockCounts);
-      break;
-
-    case EdgeInfo:
-      ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts);
-      break;
-
-    case OptEdgeInfo:
-      ReadProfilingBlock(ToolName, F, ShouldByteSwap, OptimalEdgeCounts);
-      break;
-
-    case BBTraceInfo:
-      ReadProfilingBlock(ToolName, F, ShouldByteSwap, BBTrace);
-      break;
-
-    default:
-      errs() << ToolName << ": Unknown packet type #" << PacketType << "!\n";
-      exit(1);
-    }
-  }
-
-  fclose(F);
-}
-