llvm-mirror/lib/Analysis/PathProfileVerifier.cpp
Chandler Carruth 4c1f3c24db Move all of the header files which are involved in modelling the LLVM IR
into their new header subdirectory: include/llvm/IR. This matches the
directory structure of lib, and begins to correct a long standing point
of file layout clutter in LLVM.

There are still more header files to move here, but I wanted to handle
them in separate commits to make tracking what files make sense at each
layer easier.

The only really questionable files here are the target intrinsic
tablegen files. But that's a battle I'd rather not fight today.

I've updated both CMake and Makefile build systems (I think, and my
tests think, but I may have missed something).

I've also re-sorted the includes throughout the project. I'll be
committing updates to Clang, DragonEgg, and Polly momentarily.

llvm-svn: 171366
2013-01-02 11:36:10 +00:00

207 lines
6.9 KiB
C++

//===- 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[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;
}