MachineDominators.cpp revision 02dd53e1c5b941ca5f60fca1b95ebcaf9ccd1dfc 
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
18using namespace llvm;
19
20namespace llvm {
21TEMPLATE_INSTANTIATION(class DomTreeNodeBase<MachineBasicBlock>);
22TEMPLATE_INSTANTIATION(class DominatorTreeBase<MachineBasicBlock>);
23}
24
25char MachineDominatorTree::ID = 0;
26
27INITIALIZE_PASS(MachineDominatorTree, "machinedomtree",
28                "MachineDominator Tree Construction", true, true);
29
30char &llvm::MachineDominatorsID = MachineDominatorTree::ID;
31
32void MachineDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
33  AU.setPreservesAll();
34  MachineFunctionPass::getAnalysisUsage(AU);
35}
36
37bool MachineDominatorTree::runOnMachineFunction(MachineFunction &F) {
38  DT->recalculate(F);
39
40  return false;
41}
42
43MachineDominatorTree::MachineDominatorTree()
44    : MachineFunctionPass(ID) {
45  DT = new DominatorTreeBase<MachineBasicBlock>(false);
46}
47
48MachineDominatorTree::~MachineDominatorTree() {
49  delete DT;
50}
51
52void MachineDominatorTree::releaseMemory() {
53  DT->releaseMemory();
54}
55
56void MachineDominatorTree::print(raw_ostream &OS, const Module*) const {
57  DT->print(OS);
58}
59