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   FunctionPass(ID), TM(tm), MF(nullptr) {
  24   initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
  25 }
  26
  27 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
  28   releaseMemory();
  29   assert(!MF && "MachineFunctionAnalysis left initialized!");
  30 }
  31
  32 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  33   AU.setPreservesAll();
  34   AU.addRequired<MachineModuleInfo>();
  35 }
  36
  37 bool MachineFunctionAnalysis::doInitialization(Module &M) {
  38   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
  39   assert(MMI && "MMI not around yet??");
  40   MMI->setModule(&M);
  41   NextFnNum = 0;
  42   return false;
  43 }
  44
  45
  46 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
  47   assert(!MF && "MachineFunctionAnalysis already initialized!");
  48   MF = new MachineFunction(&F, TM, NextFnNum++,
  49                            getAnalysis<MachineModuleInfo>());
  50   return false;
  51 }
  52
  53 void MachineFunctionAnalysis::releaseMemory() {
  54   delete MF;
  55   MF = nullptr;
  56 }