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/Debug.h"
19 #include "llvm/Support/raw_ostream.h"
20
21 using namespace llvm;
22
23 namespace llvm {
24
25 template class DominanceFrontierBase<BasicBlock, false>;
26 template class DominanceFrontierBase<BasicBlock, true>;
27 template class ForwardDominanceFrontierBase<BasicBlock>;
28
29 } // end namespace llvm
30
31 char DominanceFrontierWrapperPass::ID = 0;
32
33 INITIALIZE_PASS_BEGIN(DominanceFrontierWrapperPass, "domfrontier",
34 "Dominance Frontier Construction", true, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)35 INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
36 INITIALIZE_PASS_END(DominanceFrontierWrapperPass, "domfrontier",
37 "Dominance Frontier Construction", true, true)
38
39 DominanceFrontierWrapperPass::DominanceFrontierWrapperPass()
40 : FunctionPass(ID), DF() {
41 initializeDominanceFrontierWrapperPassPass(*PassRegistry::getPassRegistry());
42 }
43
releaseMemory()44 void DominanceFrontierWrapperPass::releaseMemory() {
45 DF.releaseMemory();
46 }
47
runOnFunction(Function &)48 bool DominanceFrontierWrapperPass::runOnFunction(Function &) {
49 releaseMemory();
50 DF.analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
51 return false;
52 }
53
getAnalysisUsage(AnalysisUsage & AU) const54 void DominanceFrontierWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
55 AU.setPreservesAll();
56 AU.addRequired<DominatorTreeWrapperPass>();
57 }
58
print(raw_ostream & OS,const Module *) const59 void DominanceFrontierWrapperPass::print(raw_ostream &OS, const Module *) const {
60 DF.print(OS);
61 }
62
63 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
dump() const64 LLVM_DUMP_METHOD void DominanceFrontierWrapperPass::dump() const {
65 print(dbgs());
66 }
67 #endif
68
69 /// Handle invalidation explicitly.
invalidate(Function & F,const PreservedAnalyses & PA,FunctionAnalysisManager::Invalidator &)70 bool DominanceFrontier::invalidate(Function &F, const PreservedAnalyses &PA,
71 FunctionAnalysisManager::Invalidator &) {
72 // Check whether the analysis, all analyses on functions, or the function's
73 // CFG have been preserved.
74 auto PAC = PA.getChecker<DominanceFrontierAnalysis>();
75 return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
76 PAC.preservedSet<CFGAnalyses>());
77 }
78
79 AnalysisKey DominanceFrontierAnalysis::Key;
80
run(Function & F,FunctionAnalysisManager & AM)81 DominanceFrontier DominanceFrontierAnalysis::run(Function &F,
82 FunctionAnalysisManager &AM) {
83 DominanceFrontier DF;
84 DF.analyze(AM.getResult<DominatorTreeAnalysis>(F));
85 return DF;
86 }
87
DominanceFrontierPrinterPass(raw_ostream & OS)88 DominanceFrontierPrinterPass::DominanceFrontierPrinterPass(raw_ostream &OS)
89 : OS(OS) {}
90
91 PreservedAnalyses
run(Function & F,FunctionAnalysisManager & AM)92 DominanceFrontierPrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
93 OS << "DominanceFrontier for function: " << F.getName() << "\n";
94 AM.getResult<DominanceFrontierAnalysis>(F).print(OS);
95
96 return PreservedAnalyses::all();
97 }
98