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c9008c5cc7
- Part of optimal static profiling patch sequence by Andreas Neustifter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78247 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.6 KiB
C++
104 lines
3.6 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 is distributed under the University of Illinois Open Source
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// 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/BasicBlock.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/ProfileInfo.h"
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#include "llvm/Analysis/ProfileInfoLoader.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Streams.h"
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using namespace llvm;
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static 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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namespace {
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class VISIBILITY_HIDDEN LoaderPass : public ModulePass, public ProfileInfo {
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std::string Filename;
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public:
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static char ID; // Class identification, replacement for typeinfo
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explicit LoaderPass(const std::string &filename = "")
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: ModulePass(&ID), 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 runOnModule(Module &M);
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};
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} // End of anonymous namespace
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char LoaderPass::ID = 0;
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static RegisterPass<LoaderPass>
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X("profile-loader", "Load profile information from llvmprof.out", false, true);
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static RegisterAnalysisGroup<ProfileInfo> Y(X);
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ModulePass *llvm::createProfileLoaderPass() { return new LoaderPass(); }
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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::runOnModule(Module &M) {
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ProfileInfoLoader PIL("profile-loader", Filename, M);
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EdgeCounts.clear();
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std::vector<unsigned> ECs = PIL.getRawEdgeCounts();
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std::vector<unsigned> BCs = PIL.getRawBlockCounts();
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std::vector<unsigned> FCs = PIL.getRawFunctionCounts();
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// Instrument all of the edges...
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unsigned ei = 0;
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unsigned bi = 0;
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unsigned fi = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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if (fi<FCs.size()) FunctionCounts[F] = FCs[fi++];
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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if (bi<BCs.size()) BlockCounts[BB] = BCs[bi++];
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// Okay, we have to add a counter of each outgoing edge. If the
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// outgoing edge is not critical don't split it, just insert the counter
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// in the source or destination of the edge.
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TerminatorInst *TI = BB->getTerminator();
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for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
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if (ei < ECs.size())
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EdgeCounts[std::make_pair(BB, TI->getSuccessor(s))]+= ECs[ei++];
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}
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}
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}
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if (ei != ECs.size()) {
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cerr << "WARNING: profile information is inconsistent with "
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<< "the current program!\n";
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}
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return false;
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}
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