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, 205 deletions

diff --git a/llvm/lib/Analysis/PathProfileVerifier.cpp b/llvm/lib/Analysis/PathProfileVerifier.cpp
deleted file mode 100644
index dabd3475014..00000000000
--- a/llvm/lib/Analysis/PathProfileVerifier.cpp
+++ /dev/null
@@ -1,205 +0,0 @@
-//===- PathProfileVerifier.cpp --------------------------------*- C++ -*---===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This verifier derives an edge profile file from current path profile
-// information
-//
-//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "path-profile-verifier"
-
-#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/PathProfileInfo.h"
-#include "llvm/Analysis/ProfileInfoTypes.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include <stdio.h>
-
-using namespace llvm;
-
-namespace {
-  class PathProfileVerifier : public ModulePass {
-  private:
-    bool runOnModule(Module &M);
-
-  public:
-    static char ID; // Pass identification, replacement for typeid
-    PathProfileVerifier() : ModulePass(ID) {
-      initializePathProfileVerifierPass(*PassRegistry::getPassRegistry());
-    }
-
-
-    virtual const char *getPassName() const {
-      return "Path Profiler Verifier";
-    }
-
-    // The verifier requires the path profile and edge profile.
-    virtual void getAnalysisUsage(AnalysisUsage& AU) const;
-  };
-}
-
-static cl::opt<std::string>
-EdgeProfileFilename("path-profile-verifier-file",
-  cl::init("edgefrompath.llvmprof.out"),
-  cl::value_desc("filename"),
-  cl::desc("Edge profile file generated by -path-profile-verifier"),
-  cl::Hidden);
-
-char PathProfileVerifier::ID = 0;
-INITIALIZE_PASS(PathProfileVerifier, "path-profile-verifier",
-                "Compare the path profile derived edge profile against the "
-                "edge profile.", true, true)
-
-ModulePass *llvm::createPathProfileVerifierPass() {
-  return new PathProfileVerifier();
-}
-
-// The verifier requires the path profile and edge profile.
-void PathProfileVerifier::getAnalysisUsage(AnalysisUsage& AU) const {
-  AU.addRequired<PathProfileInfo>();
-  AU.addPreserved<PathProfileInfo>();
-}
-
-typedef std::map<unsigned, unsigned> DuplicateToIndexMap;
-typedef std::map<BasicBlock*,DuplicateToIndexMap> BlockToDuplicateMap;
-typedef std::map<BasicBlock*,BlockToDuplicateMap> NestedBlockToIndexMap;
-
-// the verifier iterates through each path to gather the total
-// number of edge frequencies
-bool PathProfileVerifier::runOnModule (Module &M) {
-  PathProfileInfo& pathProfileInfo = getAnalysis<PathProfileInfo>();
-
-  // setup a data structure to map path edges which index an
-  // array of edge counters
-  NestedBlockToIndexMap arrayMap;
-  unsigned i = 0;
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
-    if (F->isDeclaration()) continue;
-
-    arrayMap[(BasicBlock*)0][F->begin()][0] = i++;
-
-    for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
-      TerminatorInst *TI = BB->getTerminator();
-
-      unsigned duplicate = 0;
-      BasicBlock* prev = 0;
-      for (unsigned s = 0, e = TI->getNumSuccessors(); s != e;
-           prev = TI->getSuccessor(s), ++s) {
-        if (prev == TI->getSuccessor(s))
-          duplicate++;
-        else duplicate = 0;
-
-        arrayMap[BB][TI->getSuccessor(s)][duplicate] = i++;
-      }
-    }
-  }
-
-  std::vector<unsigned> edgeArray(i);
-
-  // iterate through each path and increment the edge counters as needed
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
-    if (F->isDeclaration()) continue;
-
-    pathProfileInfo.setCurrentFunction(F);
-
-    DEBUG(dbgs() << "function '" << F->getName() << "' ran "
-          << pathProfileInfo.pathsRun()
-          << "/" << pathProfileInfo.getPotentialPathCount()
-          << " potential paths\n");
-
-    for( ProfilePathIterator nextPath = pathProfileInfo.pathBegin(),
-           endPath = pathProfileInfo.pathEnd();
-         nextPath != endPath; nextPath++ ) {
-      ProfilePath* currentPath = nextPath->second;
-
-      ProfilePathEdgeVector* pev = currentPath->getPathEdges();
-      DEBUG(dbgs () << "path #" << currentPath->getNumber() << ": "
-            << currentPath->getCount() << "\n");
-      // setup the entry edge (normally path profiling doesn't care about this)
-      if (currentPath->getFirstBlockInPath() == &F->getEntryBlock())
-        edgeArray[arrayMap[(BasicBlock*)0][currentPath->getFirstBlockInPath()][0]]
-          += currentPath->getCount();
-
-      for( ProfilePathEdgeIterator nextEdge = pev->begin(),
-             endEdge = pev->end(); nextEdge != endEdge; nextEdge++ ) {
-        if (nextEdge != pev->begin())
-          DEBUG(dbgs() << " :: ");
-
-        BasicBlock* source = nextEdge->getSource();
-        BasicBlock* target = nextEdge->getTarget();
-        unsigned duplicateNumber = nextEdge->getDuplicateNumber();
-        DEBUG(dbgs() << source->getName() << " --{" << duplicateNumber
-                     << "}--> " << target->getName());
-
-        // Ensure all the referenced edges exist
-        // TODO: make this a separate function
-        if( !arrayMap.count(source) ) {
-          errs() << "  error [" << F->getName() << "()]: source '"
-                 << source->getName()
-                 << "' does not exist in the array map.\n";
-        } else if( !arrayMap[source].count(target) ) {
-          errs() << "  error [" << F->getName() << "()]: target '"
-                 << target->getName()
-                 << "' does not exist in the array map.\n";
-        } else if( !arrayMap[source][target].count(duplicateNumber) ) {
-          errs() << "  error [" << F->getName() << "()]: edge "
-                 << source->getName() << " -> " << target->getName()
-                 << " duplicate number " << duplicateNumber
-                 << " does not exist in the array map.\n";
-        } else {
-          edgeArray[arrayMap[source][target][duplicateNumber]]
-            += currentPath->getCount();
-        }
-      }
-
-      DEBUG(errs() << "\n");
-
-      delete pev;
-    }
-  }
-
-  std::string filename = EdgeProfileFilename;
-
-  // Open a handle to the file
-  FILE* edgeFile = fopen(filename.c_str(),"wb");
-
-  if (!edgeFile) {
-    errs() << "error: unable to open file '" << filename << "' for output.\n";
-    return false;
-  }
-
-  errs() << "Generating edge profile '" << filename << "' ...\n";
-
-  // write argument info
-  unsigned type = ArgumentInfo;
-  unsigned num = pathProfileInfo.argList.size();
-  int zeros = 0;
-
-  fwrite(&type,sizeof(unsigned),1,edgeFile);
-  fwrite(&num,sizeof(unsigned),1,edgeFile);
-  fwrite(pathProfileInfo.argList.c_str(),1,num,edgeFile);
-  if (num&3)
-    fwrite(&zeros, 1, 4-(num&3), edgeFile);
-
-  type = EdgeInfo;
-  num = edgeArray.size();
-  fwrite(&type,sizeof(unsigned),1,edgeFile);
-  fwrite(&num,sizeof(unsigned),1,edgeFile);
-
-  // write each edge to the file
-  for( std::vector<unsigned>::iterator s = edgeArray.begin(),
-         e = edgeArray.end(); s != e; s++)
-    fwrite(&*s, sizeof (unsigned), 1, edgeFile);
-
-  fclose (edgeFile);
-
-  return true;
-}