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//===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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/Pass.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Analysis/ProfileInfoLoader.h"
#include "Support/CommandLine.h"
using namespace llvm;
namespace {
cl::opt<std::string>
ProfileInfoFilename("profile-info-file", cl::init("llvmprof.out"),
cl::value_desc("filename"),
cl::desc("Profile file loaded by -profile-loader"));
class LoaderPass : public Pass, public ProfileInfo {
std::string Filename;
std::map<BasicBlock*, unsigned> ExecutionCounts;
public:
LoaderPass(const std::string &filename = "")
: 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 run(Module &M);
virtual unsigned getExecutionCount(BasicBlock *BB) {
std::map<BasicBlock*, unsigned>::iterator I = ExecutionCounts.find(BB);
return I != ExecutionCounts.end() ? I->second : 0;
}
};
RegisterOpt<LoaderPass>
X("profile-loader", "Load profile information from llvmprof.out");
RegisterAnalysisGroup<ProfileInfo, LoaderPass> Y;
} // End of anonymous namespace
/// 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::run(Module &M) {
ProfileInfoLoader PIL("opt", Filename, M);
if (PIL.hasAccurateBlockCounts()) {
std::vector<std::pair<BasicBlock*, unsigned> > Counts;
PIL.getBlockCounts(Counts);
ExecutionCounts.insert(Counts.begin(), Counts.end());
}
return false;
}
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