1 //===- MachineDominanceFrontier.cpp ---------------------------------------===//
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/CodeGen/MachineDominanceFrontier.h"
10 #include "llvm/CodeGen/MachineDominators.h"
11 #include "llvm/CodeGen/Passes.h"
12 #include "llvm/InitializePasses.h"
13 
14 using namespace llvm;
15 
16 namespace llvm {
17 template class DominanceFrontierBase<MachineBasicBlock, false>;
18 template class DominanceFrontierBase<MachineBasicBlock, true>;
19 template class ForwardDominanceFrontierBase<MachineBasicBlock>;
20 }
21 
22 
23 char MachineDominanceFrontier::ID = 0;
24 
25 INITIALIZE_PASS_BEGIN(MachineDominanceFrontier, "machine-domfrontier",
26                 "Machine Dominance Frontier Construction", true, true)
27 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
28 INITIALIZE_PASS_END(MachineDominanceFrontier, "machine-domfrontier",
29                 "Machine Dominance Frontier Construction", true, true)
30 
31 MachineDominanceFrontier::MachineDominanceFrontier() : MachineFunctionPass(ID) {
32   initializeMachineDominanceFrontierPass(*PassRegistry::getPassRegistry());
33 }
34 
35 char &llvm::MachineDominanceFrontierID = MachineDominanceFrontier::ID;
36 
37 bool MachineDominanceFrontier::runOnMachineFunction(MachineFunction &) {
38   releaseMemory();
39   Base.analyze(getAnalysis<MachineDominatorTree>().getBase());
40   return false;
41 }
42 
43 void MachineDominanceFrontier::releaseMemory() {
44   Base.releaseMemory();
45 }
46 
47 void MachineDominanceFrontier::getAnalysisUsage(AnalysisUsage &AU) const {
48   AU.setPreservesAll();
49   AU.addRequired<MachineDominatorTree>();
50   MachineFunctionPass::getAnalysisUsage(AU);
51 }
52