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 }
79