lib/CodeGen/MachineFunctionPass.cpp

   1 //===-- MachineFunctionPass.cpp -------------------------------------------===//
   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 contains the definitions of the MachineFunctionPass members.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/MachineFunctionPass.h"
  15 #include "llvm/Analysis/AliasAnalysis.h"
  16 #include "llvm/Analysis/DominanceFrontier.h"
  17 #include "llvm/Analysis/IVUsers.h"
  18 #include "llvm/Analysis/LoopInfo.h"
  19 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
  20 #include "llvm/Analysis/ScalarEvolution.h"
  21 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
  22 #include "llvm/CodeGen/Passes.h"
  23 #include "llvm/CodeGen/StackProtector.h"
  24 #include "llvm/IR/Dominators.h"
  25 #include "llvm/IR/Function.h"
  26 using namespace llvm;
  27
  28 Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
  29                                              const std::string &Banner) const {
  30   return createMachineFunctionPrinterPass(O, Banner);
  31 }
  32
  33 bool MachineFunctionPass::runOnFunction(Function &F) {
  34   // Do not codegen any 'available_externally' functions at all, they have
  35   // definitions outside the translation unit.
  36   if (F.hasAvailableExternallyLinkage())
  37     return false;
  38
  39   MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
  40   return runOnMachineFunction(MF);
  41 }
  42
  43 void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
  44   AU.addRequired<MachineFunctionAnalysis>();
  45   AU.addPreserved<MachineFunctionAnalysis>();
  46
  47   // MachineFunctionPass preserves all LLVM IR passes, but there's no
  48   // high-level way to express this. Instead, just list a bunch of
  49   // passes explicitly. This does not include setPreservesCFG,
  50   // because CodeGen overloads that to mean preserving the MachineBasicBlock
  51   // CFG in addition to the LLVM IR CFG.
  52   AU.addPreserved<AliasAnalysis>();
  53   AU.addPreserved<DominanceFrontier>();
  54   AU.addPreserved<DominatorTreeWrapperPass>();
  55   AU.addPreserved<IVUsers>();
  56   AU.addPreserved<LoopInfoWrapperPass>();
  57   AU.addPreserved<MemoryDependenceAnalysis>();
  58   AU.addPreserved<ScalarEvolution>();
  59   AU.addPreserved<StackProtector>();
  60
  61   FunctionPass::getAnalysisUsage(AU);
  62 }