lib/CodeGen/MachineFunctionAnalysis.cpp

   1 //===-- MachineFunctionAnalysis.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 MachineFunctionAnalysis members.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
  15 #include "llvm/CodeGen/GCMetadata.h"
  16 #include "llvm/CodeGen/MachineFunction.h"
  17 #include "llvm/CodeGen/MachineModuleInfo.h"
  18 using namespace llvm;
  19
  20 char MachineFunctionAnalysis::ID = 0;
  21
  22 MachineFunctionAnalysis::MachineFunctionAnalysis(const TargetMachine &tm,
  23                                                  CodeGenOpt::Level OL) :
  24   FunctionPass(ID), TM(tm), OptLevel(OL), MF(0) {
  25   initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
  26 }
  27
  28 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
  29   releaseMemory();
  30   assert(!MF && "MachineFunctionAnalysis left initialized!");
  31 }
  32
  33 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  34   AU.setPreservesAll();
  35   AU.addRequired<MachineModuleInfo>();
  36 }
  37
  38 bool MachineFunctionAnalysis::doInitialization(Module &M) {
  39   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
  40   assert(MMI && "MMI not around yet??");
  41   MMI->setModule(&M);
  42   NextFnNum = 0;
  43   return false;
  44 }
  45
  46
  47 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
  48   assert(!MF && "MachineFunctionAnalysis already initialized!");
  49   MF = new MachineFunction(&F, TM, NextFnNum++,
  50                            getAnalysis<MachineModuleInfo>(),
  51                            getAnalysisIfAvailable<GCModuleInfo>());
  52   return false;
  53 }
  54
  55 void MachineFunctionAnalysis::releaseMemory() {
  56   delete MF;
  57   MF = 0;
  58 }