contrib/llvm/lib/CodeGen/MachinePostDominators.cpp

   1 //===- MachinePostDominators.cpp -Machine Post 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 // post dominators on machine functions.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/CodeGen/MachinePostDominators.h"
  16
  17 using namespace llvm;
  18
  19 namespace llvm {
  20 template class DominatorTreeBase<MachineBasicBlock, true>; // PostDomTreeBase
  21 }
  22
  23 char MachinePostDominatorTree::ID = 0;
  24
  25 //declare initializeMachinePostDominatorTreePass
  26 INITIALIZE_PASS(MachinePostDominatorTree, "machinepostdomtree",
  27                 "MachinePostDominator Tree Construction", true, true)
  28
  29 MachinePostDominatorTree::MachinePostDominatorTree() : MachineFunctionPass(ID) {
  30   initializeMachinePostDominatorTreePass(*PassRegistry::getPassRegistry());
  31   DT = new PostDomTreeBase<MachineBasicBlock>();
  32 }
  33
  34 FunctionPass *
  35 MachinePostDominatorTree::createMachinePostDominatorTreePass() {
  36   return new MachinePostDominatorTree();
  37 }
  38
  39 bool
  40 MachinePostDominatorTree::runOnMachineFunction(MachineFunction &F) {
  41   DT->recalculate(F);
  42   return false;
  43 }
  44
  45 MachinePostDominatorTree::~MachinePostDominatorTree() {
  46   delete DT;
  47 }
  48
  49 void
  50 MachinePostDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
  51   AU.setPreservesAll();
  52   MachineFunctionPass::getAnalysisUsage(AU);
  53 }
  54
  55 void
  56 MachinePostDominatorTree::print(llvm::raw_ostream &OS, const Module *M) const {
  57   DT->print(OS);
  58 }