1 //===- DominanceFrontier.cpp - Dominance Frontier Calculation -------------===//
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/DominanceFrontier.h"
10 #include "llvm/Analysis/DominanceFrontierImpl.h"
11 #include "llvm/Config/llvm-config.h"
12 #include "llvm/IR/Dominators.h"
13 #include "llvm/IR/Function.h"
14 #include "llvm/IR/PassManager.h"
15 #include "llvm/InitializePasses.h"
16 #include "llvm/Pass.h"
17 #include "llvm/Support/Compiler.h"
18 #include "llvm/Support/raw_ostream.h"
19
20 using namespace llvm;
21
22 namespace llvm {
23
24 template class DominanceFrontierBase<BasicBlock, false>;
25 template class DominanceFrontierBase<BasicBlock, true>;
26 template class ForwardDominanceFrontierBase<BasicBlock>;
27
28 } // end namespace llvm
29
30 char DominanceFrontierWrapperPass::ID = 0;
31
32 INITIALIZE_PASS_BEGIN(DominanceFrontierWrapperPass, "domfrontier",
33 "Dominance Frontier Construction", true, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)34 INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
35 INITIALIZE_PASS_END(DominanceFrontierWrapperPass, "domfrontier",
36 "Dominance Frontier Construction", true, true)
37
38 DominanceFrontierWrapperPass::DominanceFrontierWrapperPass()
39 : FunctionPass(ID) {}
40
releaseMemory()41 void DominanceFrontierWrapperPass::releaseMemory() {
42 DF.releaseMemory();
43 }
44
runOnFunction(Function &)45 bool DominanceFrontierWrapperPass::runOnFunction(Function &) {
46 releaseMemory();
47 DF.analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
48 return false;
49 }
50
getAnalysisUsage(AnalysisUsage & AU) const51 void DominanceFrontierWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
52 AU.setPreservesAll();
53 AU.addRequired<DominatorTreeWrapperPass>();
54 }
55
print(raw_ostream & OS,const Module *) const56 void DominanceFrontierWrapperPass::print(raw_ostream &OS, const Module *) const {
57 DF.print(OS);
58 }
59
60 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
dump() const61 LLVM_DUMP_METHOD void DominanceFrontierWrapperPass::dump() const {
62 print(dbgs());
63 }
64 #endif
65
66 /// Handle invalidation explicitly.
invalidate(Function & F,const PreservedAnalyses & PA,FunctionAnalysisManager::Invalidator &)67 bool DominanceFrontier::invalidate(Function &F, const PreservedAnalyses &PA,
68 FunctionAnalysisManager::Invalidator &) {
69 // Check whether the analysis, all analyses on functions, or the function's
70 // CFG have been preserved.
71 auto PAC = PA.getChecker<DominanceFrontierAnalysis>();
72 return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
73 PAC.preservedSet<CFGAnalyses>());
74 }
75
76 AnalysisKey DominanceFrontierAnalysis::Key;
77
run(Function & F,FunctionAnalysisManager & AM)78 DominanceFrontier DominanceFrontierAnalysis::run(Function &F,
79 FunctionAnalysisManager &AM) {
80 DominanceFrontier DF;
81 DF.analyze(AM.getResult<DominatorTreeAnalysis>(F));
82 return DF;
83 }
84
DominanceFrontierPrinterPass(raw_ostream & OS)85 DominanceFrontierPrinterPass::DominanceFrontierPrinterPass(raw_ostream &OS)
86 : OS(OS) {}
87
88 PreservedAnalyses
run(Function & F,FunctionAnalysisManager & AM)89 DominanceFrontierPrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
90 OS << "DominanceFrontier for function: " << F.getName() << "\n";
91 AM.getResult<DominanceFrontierAnalysis>(F).print(OS);
92
93 return PreservedAnalyses::all();
94 }
95