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