1 //===- MachineDominators.cpp - Machine Dominator Calculation --------------===//
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 // This file implements simple dominator construction algorithms for finding
11 // forward dominators on machine functions.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/CodeGen/MachineDominators.h"
16 #include "llvm/CodeGen/Passes.h"
17 
18 using namespace llvm;
19 
20 namespace llvm {
21 TEMPLATE_INSTANTIATION(class DomTreeNodeBase<MachineBasicBlock>);
22 TEMPLATE_INSTANTIATION(class DominatorTreeBase<MachineBasicBlock>);
23 }
24 
25 char MachineDominatorTree::ID = 0;
26 
27 INITIALIZE_PASS(MachineDominatorTree, "machinedomtree",
28                 "MachineDominator Tree Construction", true, true)
29 
30 char &llvm::MachineDominatorsID = MachineDominatorTree::ID;
31 
getAnalysisUsage(AnalysisUsage & AU) const32 void MachineDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
33   AU.setPreservesAll();
34   MachineFunctionPass::getAnalysisUsage(AU);
35 }
36 
runOnMachineFunction(MachineFunction & F)37 bool MachineDominatorTree::runOnMachineFunction(MachineFunction &F) {
38   CriticalEdgesToSplit.clear();
39   NewBBs.clear();
40   DT->recalculate(F);
41 
42   return false;
43 }
44 
MachineDominatorTree()45 MachineDominatorTree::MachineDominatorTree()
46     : MachineFunctionPass(ID) {
47   initializeMachineDominatorTreePass(*PassRegistry::getPassRegistry());
48   DT = new DominatorTreeBase<MachineBasicBlock>(false);
49 }
50 
~MachineDominatorTree()51 MachineDominatorTree::~MachineDominatorTree() {
52   delete DT;
53 }
54 
releaseMemory()55 void MachineDominatorTree::releaseMemory() {
56   DT->releaseMemory();
57 }
58 
print(raw_ostream & OS,const Module *) const59 void MachineDominatorTree::print(raw_ostream &OS, const Module*) const {
60   DT->print(OS);
61 }
62