llvm/lib/Analysis/CycleAnalysis.cpp

   1 //===- CycleAnalysis.cpp - Compute CycleInfo for LLVM IR ------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Analysis/CycleAnalysis.h"
  10 #include "llvm/ADT/GenericCycleImpl.h"
  11 #include "llvm/IR/CFG.h" // for successors found by ADL in GenericCycleImpl.h
  12 #include "llvm/InitializePasses.h"
  13
  14 using namespace llvm;
  15
  16 namespace llvm {
  17 class Module;
  18 }
  19
  20 CycleInfo CycleAnalysis::run(Function &F, FunctionAnalysisManager &) {
  21   CycleInfo CI;
  22   CI.compute(F);
  23   return CI;
  24 }
  25
  26 AnalysisKey CycleAnalysis::Key;
  27
  28 CycleInfoPrinterPass::CycleInfoPrinterPass(raw_ostream &OS) : OS(OS) {}
  29
  30 PreservedAnalyses CycleInfoPrinterPass::run(Function &F,
  31                                             FunctionAnalysisManager &AM) {
  32   OS << "CycleInfo for function: " << F.getName() << "\n";
  33   AM.getResult<CycleAnalysis>(F).print(OS);
  34
  35   return PreservedAnalyses::all();
  36 }
  37
  38 //===----------------------------------------------------------------------===//
  39 //  CycleInfoWrapperPass Implementation
  40 //===----------------------------------------------------------------------===//
  41 //
  42 // The implementation details of the wrapper pass that holds a CycleInfo
  43 // suitable for use with the legacy pass manager.
  44 //
  45 //===----------------------------------------------------------------------===//
  46
  47 char CycleInfoWrapperPass::ID = 0;
  48
  49 CycleInfoWrapperPass::CycleInfoWrapperPass() : FunctionPass(ID) {
  50   initializeCycleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
  51 }
  52
  53 INITIALIZE_PASS_BEGIN(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis",
  54                       true, true)
  55 INITIALIZE_PASS_END(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis", true,
  56                     true)
  57
  58 void CycleInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
  59   AU.setPreservesAll();
  60 }
  61
  62 bool CycleInfoWrapperPass::runOnFunction(Function &Func) {
  63   CI.clear();
  64
  65   F = &Func;
  66   CI.compute(Func);
  67   return false;
  68 }
  69
  70 void CycleInfoWrapperPass::print(raw_ostream &OS, const Module *) const {
  71   OS << "CycleInfo for function: " << F->getName() << "\n";
  72   CI.print(OS);
  73 }
  74
  75 void CycleInfoWrapperPass::releaseMemory() {
  76   CI.clear();
  77   F = nullptr;
  78 }