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 #include "llvm/CodeGen/MachineFunctionInitializer.h"
  19 using namespace llvm;
  20
  21 char MachineFunctionAnalysis::ID = 0;
  22
  23 MachineFunctionAnalysis::MachineFunctionAnalysis(
  24     const TargetMachine &tm, MachineFunctionInitializer *MFInitializer)
  25     : FunctionPass(ID), TM(tm), MF(nullptr), MFInitializer(MFInitializer) {
  26   initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
  27 }
  28
  29 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
  30   releaseMemory();
  31   assert(!MF && "MachineFunctionAnalysis left initialized!");
  32 }
  33
  34 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  35   AU.setPreservesAll();
  36   AU.addRequired<MachineModuleInfo>();
  37 }
  38
  39 bool MachineFunctionAnalysis::doInitialization(Module &M) {
  40   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
  41   assert(MMI && "MMI not around yet??");
  42   MMI->setModule(&M);
  43   NextFnNum = 0;
  44   return false;
  45 }
  46
  47
  48 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
  49   assert(!MF && "MachineFunctionAnalysis already initialized!");
  50   MF = new MachineFunction(&F, TM, NextFnNum++,
  51                            getAnalysis<MachineModuleInfo>());
  52   if (MFInitializer)
  53     MFInitializer->initializeMachineFunction(*MF);
  54   return false;
  55 }
  56
  57 void MachineFunctionAnalysis::releaseMemory() {
  58   delete MF;
  59   MF = nullptr;
  60 }