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//===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a concrete implementation of profiling information that
// loads the information from a profile dump file.
//
//===----------------------------------------------------------------------===//
#include "llvm/BasicBlock.h"
#include "llvm/InstrTypes.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Analysis/ProfileInfoLoader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Streams.h"
using namespace llvm;
static cl::opt<std::string>
ProfileInfoFilename("profile-info-file", cl::init("llvmprof.out"),
cl::value_desc("filename"),
cl::desc("Profile file loaded by -profile-loader"));
namespace {
class VISIBILITY_HIDDEN LoaderPass : public ModulePass, public ProfileInfo {
std::string Filename;
public:
static char ID; // Class identification, replacement for typeinfo
explicit LoaderPass(const std::string &filename = "")
: ModulePass(&ID), Filename(filename) {
if (filename.empty()) Filename = ProfileInfoFilename;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
virtual const char *getPassName() const {
return "Profiling information loader";
}
/// run - Load the profile information from the specified file.
virtual bool runOnModule(Module &M);
};
} // End of anonymous namespace
char LoaderPass::ID = 0;
static RegisterPass<LoaderPass>
X("profile-loader", "Load profile information from llvmprof.out", false, true);
static RegisterAnalysisGroup<ProfileInfo> Y(X);
ModulePass *llvm::createProfileLoaderPass() { return new LoaderPass(); }
/// createProfileLoaderPass - This function returns a Pass that loads the
/// profiling information for the module from the specified filename, making it
/// available to the optimizers.
Pass *llvm::createProfileLoaderPass(const std::string &Filename) {
return new LoaderPass(Filename);
}
bool LoaderPass::runOnModule(Module &M) {
ProfileInfoLoader PIL("profile-loader", Filename, M);
EdgeCounts.clear();
std::vector<unsigned> ECs = PIL.getRawEdgeCounts();
std::vector<unsigned> BCs = PIL.getRawBlockCounts();
std::vector<unsigned> FCs = PIL.getRawFunctionCounts();
// Instrument all of the edges...
unsigned ei = 0;
unsigned bi = 0;
unsigned fi = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
if (fi<FCs.size()) FunctionCounts[F] = FCs[fi++];
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
if (bi<BCs.size()) BlockCounts[BB] = BCs[bi++];
// Okay, we have to add a counter of each outgoing edge. If the
// outgoing edge is not critical don't split it, just insert the counter
// in the source or destination of the edge.
TerminatorInst *TI = BB->getTerminator();
for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
if (ei < ECs.size())
EdgeCounts[std::make_pair(BB, TI->getSuccessor(s))]+= ECs[ei++];
}
}
}
if (ei != ECs.size()) {
cerr << "WARNING: profile information is inconsistent with "
<< "the current program!\n";
}
return false;
}
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