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/Analysis/DominanceFrontierImpl.h"
  11 #include "llvm/CodeGen/MachineDominators.h"
  12 #include "llvm/CodeGen/Passes.h"
  13 #include "llvm/InitializePasses.h"
  14
  15 using namespace llvm;
  16
  17 namespace llvm {
  18 template class DominanceFrontierBase<MachineBasicBlock, false>;
  19 template class DominanceFrontierBase<MachineBasicBlock, true>;
  20 template class ForwardDominanceFrontierBase<MachineBasicBlock>;
  21 }
  22
  23
  24 char MachineDominanceFrontier::ID = 0;
  25
  26 INITIALIZE_PASS_BEGIN(MachineDominanceFrontier, "machine-domfrontier",
  27                 "Machine Dominance Frontier Construction", true, true)
  28 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
  29 INITIALIZE_PASS_END(MachineDominanceFrontier, "machine-domfrontier",
  30                 "Machine Dominance Frontier Construction", true, true)
  31
  32 MachineDominanceFrontier::MachineDominanceFrontier() : MachineFunctionPass(ID) {
  33   initializeMachineDominanceFrontierPass(*PassRegistry::getPassRegistry());
  34 }
  35
  36 char &llvm::MachineDominanceFrontierID = MachineDominanceFrontier::ID;
  37
  38 bool MachineDominanceFrontier::runOnMachineFunction(MachineFunction &) {
  39   releaseMemory();
  40   Base.analyze(getAnalysis<MachineDominatorTree>().getBase());
  41   return false;
  42 }
  43
  44 void MachineDominanceFrontier::releaseMemory() {
  45   Base.releaseMemory();
  46 }
  47
  48 void MachineDominanceFrontier::getAnalysisUsage(AnalysisUsage &AU) const {
  49   AU.setPreservesAll();
  50   AU.addRequired<MachineDominatorTree>();
  51   MachineFunctionPass::getAnalysisUsage(AU);
  52 }