xref: /freebsd/contrib/llvm-project/llvm/lib/Analysis/CycleAnalysis.cpp (revision 924226fba12cc9a228c73b956e1b7fa24c60b055)
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"
12 #include "llvm/InitializePasses.h"
13 
14 using namespace llvm;
15 
16 template class llvm::GenericCycleInfo<SSAContext>;
17 template class llvm::GenericCycle<SSAContext>;
18 
19 CycleInfo CycleAnalysis::run(Function &F, FunctionAnalysisManager &) {
20   CycleInfo CI;
21   CI.compute(F);
22   return CI;
23 }
24 
25 AnalysisKey CycleAnalysis::Key;
26 
27 CycleInfoPrinterPass::CycleInfoPrinterPass(raw_ostream &OS) : OS(OS) {}
28 
29 PreservedAnalyses CycleInfoPrinterPass::run(Function &F,
30                                             FunctionAnalysisManager &AM) {
31   OS << "CycleInfo for function: " << F.getName() << "\n";
32   AM.getResult<CycleAnalysis>(F).print(OS);
33 
34   return PreservedAnalyses::all();
35 }
36 
37 //===----------------------------------------------------------------------===//
38 //  CycleInfoWrapperPass Implementation
39 //===----------------------------------------------------------------------===//
40 //
41 // The implementation details of the wrapper pass that holds a CycleInfo
42 // suitable for use with the legacy pass manager.
43 //
44 //===----------------------------------------------------------------------===//
45 
46 char CycleInfoWrapperPass::ID = 0;
47 
48 CycleInfoWrapperPass::CycleInfoWrapperPass() : FunctionPass(ID) {
49   initializeCycleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
50 }
51 
52 INITIALIZE_PASS_BEGIN(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis",
53                       true, true)
54 INITIALIZE_PASS_END(CycleInfoWrapperPass, "cycles", "Cycle Info Analysis", true,
55                     true)
56 
57 void CycleInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
58   AU.setPreservesAll();
59 }
60 
61 bool CycleInfoWrapperPass::runOnFunction(Function &Func) {
62   CI.clear();
63 
64   F = &Func;
65   CI.compute(Func);
66   return false;
67 }
68 
69 void CycleInfoWrapperPass::print(raw_ostream &OS, const Module *) const {
70   OS << "CycleInfo for function: " << F->getName() << "\n";
71   CI.print(OS);
72 }
73 
74 void CycleInfoWrapperPass::releaseMemory() {
75   CI.clear();
76   F = nullptr;
77 }
78