1 //===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements a concrete implementation of profiling information that
11 // loads the information from a profile dump file.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/BasicBlock.h"
16 #include "llvm/InstrTypes.h"
17 #include "llvm/Pass.h"
18 #include "llvm/Analysis/ProfileInfo.h"
19 #include "llvm/Analysis/ProfileInfoLoader.h"
20 #include "Support/CommandLine.h"
25 ProfileInfoFilename("profile-info-file", cl::init("llvmprof.out"),
26 cl::value_desc("filename"),
27 cl::desc("Profile file loaded by -profile-loader"));
29 class LoaderPass : public Pass, public ProfileInfo {
32 LoaderPass(const std::string &filename = "")
33 : Filename(filename) {
34 if (filename.empty()) Filename = ProfileInfoFilename;
37 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
41 virtual const char *getPassName() const {
42 return "Profiling information loader";
45 /// run - Load the profile information from the specified file.
46 virtual bool run(Module &M);
49 RegisterOpt<LoaderPass>
50 X("profile-loader", "Load profile information from llvmprof.out");
52 RegisterAnalysisGroup<ProfileInfo, LoaderPass> Y;
53 } // End of anonymous namespace
56 /// createProfileLoaderPass - This function returns a Pass that loads the
57 /// profiling information for the module from the specified filename, making it
58 /// available to the optimizers.
59 Pass *llvm::createProfileLoaderPass(const std::string &Filename) {
60 return new LoaderPass(Filename);
63 bool LoaderPass::run(Module &M) {
64 ProfileInfoLoader PIL("profile-loader", Filename, M);
66 bool PrintedWarning = false;
68 std::vector<std::pair<ProfileInfoLoader::Edge, unsigned> > ECs;
69 PIL.getEdgeCounts(ECs);
70 for (unsigned i = 0, e = ECs.size(); i != e; ++i) {
71 BasicBlock *BB = ECs[i].first.first;
72 unsigned SuccNum = ECs[i].first.second;
73 TerminatorInst *TI = BB->getTerminator();
74 if (SuccNum >= TI->getNumSuccessors()) {
75 if (!PrintedWarning) {
76 std::cerr << "WARNING: profile information is inconsistent with "
77 << "the current program!\n";
78 PrintedWarning = true;
81 EdgeCounts[std::make_pair(BB, TI->getSuccessor(SuccNum))]+= ECs[i].second;