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//===- 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/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ProfileInfoTypes.h"
#include "llvm/Analysis/PathProfileInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/CommandLine.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[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[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 errorInfo;
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;
}
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