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/Analysis/AliasAnalysis.h"
  15 #include "llvm/Analysis/ScalarEvolution.h"
  16 #include "llvm/Analysis/IVUsers.h"
  17 #include "llvm/Analysis/LiveValues.h"
  18 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
  19 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
  20 #include "llvm/CodeGen/MachineFunctionPass.h"
  21 using namespace llvm;
  22
  23 bool MachineFunctionPass::runOnFunction(Function &F) {
  24   // Do not codegen any 'available_externally' functions at all, they have
  25   // definitions outside the translation unit.
  26   if (F.hasAvailableExternallyLinkage())
  27     return false;
  28
  29   MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
  30   return runOnMachineFunction(MF);
  31 }
  32
  33 void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
  34   AU.addRequired<MachineFunctionAnalysis>();
  35   AU.addPreserved<MachineFunctionAnalysis>();
  36
  37   // MachineFunctionPass preserves all LLVM IR passes, but there's no
  38   // high-level way to express this. Instead, just list a bunch of
  39   // passes explicitly.
  40   AU.addPreserved<AliasAnalysis>();
  41   AU.addPreserved<ScalarEvolution>();
  42   AU.addPreserved<IVUsers>();
  43   AU.addPreserved<MemoryDependenceAnalysis>();
  44   AU.addPreserved<LiveValues>();
  45   AU.addPreserved<DominatorTree>();
  46   AU.addPreserved<DominanceFrontier>();
  47   AU.addPreserved<LoopInfo>();
  48
  49   FunctionPass::getAnalysisUsage(AU);
  50 }