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1 //===- MachineDominanceFrontier.cpp ---------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/CodeGen/MachineDominanceFrontier.h"
11 #include "llvm/Analysis/DominanceFrontierImpl.h"
12 #include "llvm/CodeGen/MachineDominators.h"
13 #include "llvm/CodeGen/Passes.h"
14 
15 
16 using namespace llvm;
17 
18 namespace llvm {
19 template class DominanceFrontierBase<MachineBasicBlock>;
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)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)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 
runOnMachineFunction(MachineFunction &)40 bool MachineDominanceFrontier::runOnMachineFunction(MachineFunction &) {
41   releaseMemory();
42   Base.analyze(getAnalysis<MachineDominatorTree>().getBase());
43   return false;
44 }
45 
releaseMemory()46 void MachineDominanceFrontier::releaseMemory() {
47   Base.releaseMemory();
48 }
49 
getAnalysisUsage(AnalysisUsage & AU) const50 void MachineDominanceFrontier::getAnalysisUsage(AnalysisUsage &AU) const {
51   AU.setPreservesAll();
52   AU.addRequired<MachineDominatorTree>();
53   MachineFunctionPass::getAnalysisUsage(AU);
54 }
55