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 // Register this pass with PassInfo directly to avoid having to define
  21 // a default constructor.
  22 static PassInfo
  23 X("Machine Function Analysis", "machine-function-analysis",
  24    &MachineFunctionAnalysis::ID, 0,
  25   /*CFGOnly=*/false, /*is_analysis=*/true);
  26
  27 char MachineFunctionAnalysis::ID = 0;
  28
  29 MachineFunctionAnalysis::MachineFunctionAnalysis(const TargetMachine &tm,
  30                                                  CodeGenOpt::Level OL) :
  31   FunctionPass(ID), TM(tm), OptLevel(OL), MF(0) {
  32 }
  33
  34 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
  35   releaseMemory();
  36   assert(!MF && "MachineFunctionAnalysis left initialized!");
  37 }
  38
  39 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  40   AU.setPreservesAll();
  41   AU.addRequired<MachineModuleInfo>();
  42 }
  43
  44 bool MachineFunctionAnalysis::doInitialization(Module &M) {
  45   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
  46   assert(MMI && "MMI not around yet??");
  47   MMI->setModule(&M);
  48   NextFnNum = 0;
  49   return false;
  50 }
  51
  52
  53 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
  54   assert(!MF && "MachineFunctionAnalysis already initialized!");
  55   MF = new MachineFunction(&F, TM, NextFnNum++,
  56                            getAnalysis<MachineModuleInfo>(),
  57                            getAnalysisIfAvailable<GCModuleInfo>());
  58   return false;
  59 }
  60
  61 void MachineFunctionAnalysis::releaseMemory() {
  62   delete MF;
  63   MF = 0;
  64 }