lib/CodeGen/MachineDominators.cpp

   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 TEMPLATE_INSTANTIATION(class DomTreeNodeBase<MachineBasicBlock>);
  21 TEMPLATE_INSTANTIATION(class DominatorTreeBase<MachineBasicBlock>);
  22
  23 char MachineDominatorTree::ID = 0;
  24
  25 static RegisterPass<MachineDominatorTree>
  26 E("machinedomtree", "MachineDominator Tree Construction", true);
  27
  28 const PassInfo *const llvm::MachineDominatorsID = &E;
  29
  30 void MachineDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
  31   AU.setPreservesAll();
  32   MachineFunctionPass::getAnalysisUsage(AU);
  33 }
  34
  35 bool MachineDominatorTree::runOnMachineFunction(MachineFunction &F) {
  36   DT->recalculate(F);
  37
  38   return false;
  39 }
  40
  41 MachineDominatorTree::MachineDominatorTree()
  42     : MachineFunctionPass(&ID) {
  43   DT = new DominatorTreeBase<MachineBasicBlock>(false);
  44 }
  45
  46 MachineDominatorTree::~MachineDominatorTree() {
  47   DT->releaseMemory();
  48   delete DT;
  49 }
  50
  51 void MachineDominatorTree::releaseMemory() {
  52   DT->releaseMemory();
  53 }