llvm/lib/CodeGen/MachineDominanceFrontier.cpp

   1 //===- MachineDominanceFrontier.cpp ---------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/CodeGen/MachineDominanceFrontier.h"
  10 #include "llvm/CodeGen/MachineDominators.h"
  11 #include "llvm/CodeGen/Passes.h"
  12 #include "llvm/InitializePasses.h"
  13 #include "llvm/Pass.h"
  14 #include "llvm/PassRegistry.h"
  15
  16 using namespace llvm;
  17
  18 namespace llvm {
  19 template class DominanceFrontierBase<MachineBasicBlock, false>;
  20 template class DominanceFrontierBase<MachineBasicBlock, true>;
  21 template class ForwardDominanceFrontierBase<MachineBasicBlock>;
  22 }
  23
  24
  25 char MachineDominanceFrontier::ID = 0;
  26
  27 INITIALIZE_PASS_BEGIN(MachineDominanceFrontier, "machine-domfrontier",
  28                 "Machine Dominance Frontier Construction", true, true)
  29 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
  30 INITIALIZE_PASS_END(MachineDominanceFrontier, "machine-domfrontier",
  31                 "Machine Dominance Frontier Construction", true, true)
  32
  33 MachineDominanceFrontier::MachineDominanceFrontier() : MachineFunctionPass(ID) {
  34   initializeMachineDominanceFrontierPass(*PassRegistry::getPassRegistry());
  35 }
  36
  37 char &llvm::MachineDominanceFrontierID = MachineDominanceFrontier::ID;
  38
  39 bool MachineDominanceFrontier::runOnMachineFunction(MachineFunction &) {
  40   releaseMemory();
  41   Base.analyze(getAnalysis<MachineDominatorTree>().getBase());
  42   return false;
  43 }
  44
  45 void MachineDominanceFrontier::releaseMemory() {
  46   Base.releaseMemory();
  47 }
  48
  49 void MachineDominanceFrontier::getAnalysisUsage(AnalysisUsage &AU) const {
  50   AU.setPreservesAll();
  51   AU.addRequired<MachineDominatorTree>();
  52   MachineFunctionPass::getAnalysisUsage(AU);
  53 }