xref: /freebsd/contrib/llvm-project/llvm/lib/CodeGen/MachineDominanceFrontier.cpp (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
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/Analysis/DominanceFrontierImpl.h"
11 #include "llvm/CodeGen/MachineDominators.h"
12 #include "llvm/CodeGen/Passes.h"
13 #include "llvm/InitializePasses.h"
14 
15 using namespace llvm;
16 
17 namespace llvm {
18 template class DominanceFrontierBase<MachineBasicBlock, false>;
19 template class DominanceFrontierBase<MachineBasicBlock, true>;
20 template class ForwardDominanceFrontierBase<MachineBasicBlock>;
21 }
22 
23 
24 char MachineDominanceFrontier::ID = 0;
25 
26 INITIALIZE_PASS_BEGIN(MachineDominanceFrontier, "machine-domfrontier",
27                 "Machine Dominance Frontier Construction", true, true)
28 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
29 INITIALIZE_PASS_END(MachineDominanceFrontier, "machine-domfrontier",
30                 "Machine Dominance Frontier Construction", true, true)
31 
32 MachineDominanceFrontier::MachineDominanceFrontier()
33   : MachineFunctionPass(ID),
34     Base() {
35   initializeMachineDominanceFrontierPass(*PassRegistry::getPassRegistry());
36 }
37 
38 char &llvm::MachineDominanceFrontierID = MachineDominanceFrontier::ID;
39 
40 bool MachineDominanceFrontier::runOnMachineFunction(MachineFunction &) {
41   releaseMemory();
42   Base.analyze(getAnalysis<MachineDominatorTree>().getBase());
43   return false;
44 }
45 
46 void MachineDominanceFrontier::releaseMemory() {
47   Base.releaseMemory();
48 }
49 
50 void MachineDominanceFrontier::getAnalysisUsage(AnalysisUsage &AU) const {
51   AU.setPreservesAll();
52   AU.addRequired<MachineDominatorTree>();
53   MachineFunctionPass::getAnalysisUsage(AU);
54 }
55