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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
//===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a concrete implementation of profiling information that
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// loads the information from a profile dump file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Pass.h"
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#include "llvm/Analysis/ProfileInfo.h"
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#include "llvm/Analysis/ProfileInfoLoader.h"
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#include "Support/CommandLine.h"
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using namespace llvm;
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namespace {
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cl::opt<std::string>
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ProfileInfoFilename("profile-info-file", cl::init("llvmprof.out"),
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cl::value_desc("filename"),
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cl::desc("Profile file loaded by -profile-loader"));
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class LoaderPass : public Pass, public ProfileInfo {
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std::string Filename;
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std::map<BasicBlock*, unsigned> ExecutionCounts;
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public:
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LoaderPass(const std::string &filename = "")
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: Filename(filename) {
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if (filename.empty()) Filename = ProfileInfoFilename;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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virtual const char *getPassName() const {
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return "Profiling information loader";
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}
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/// run - Load the profile information from the specified file.
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virtual bool run(Module &M);
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virtual unsigned getExecutionCount(BasicBlock *BB) {
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std::map<BasicBlock*, unsigned>::iterator I = ExecutionCounts.find(BB);
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return I != ExecutionCounts.end() ? I->second : 0;
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}
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};
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RegisterOpt<LoaderPass>
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X("profile-loader", "Load profile information from llvmprof.out");
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RegisterAnalysisGroup<ProfileInfo, LoaderPass> Y;
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} // End of anonymous namespace
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/// createProfileLoaderPass - This function returns a Pass that loads the
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/// profiling information for the module from the specified filename, making it
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/// available to the optimizers.
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Pass *llvm::createProfileLoaderPass(const std::string &Filename) {
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return new LoaderPass(Filename);
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}
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bool LoaderPass::run(Module &M) {
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ProfileInfoLoader PIL("opt", Filename, M);
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if (PIL.hasAccurateBlockCounts()) {
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std::vector<std::pair<BasicBlock*, unsigned> > Counts;
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PIL.getBlockCounts(Counts);
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ExecutionCounts.insert(Counts.begin(), Counts.end());
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}
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return false;
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}
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