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/MachineFunction.h"
  16 #include "llvm/CodeGen/MachineModuleInfo.h"
  17 using namespace llvm;
  18
  19 // Register this pass with PassInfo directly to avoid having to define
  20 // a default constructor.
  21 static PassInfo
  22 X("Machine Function Analysis", "machine-function-analysis",
  23   intptr_t(&MachineFunctionAnalysis::ID), 0,
  24   /*CFGOnly=*/false, /*is_analysis=*/true);
  25
  26 char MachineFunctionAnalysis::ID = 0;
  27
  28 MachineFunctionAnalysis::MachineFunctionAnalysis(const TargetMachine &tm,
  29                                                  CodeGenOpt::Level OL) :
  30   FunctionPass(&ID), TM(tm), OptLevel(OL), MF(0) {
  31 }
  32
  33 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
  34   releaseMemory();
  35   assert(!MF && "MachineFunctionAnalysis left initialized!");
  36 }
  37
  38 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
  39   assert(!MF && "MachineFunctionAnalysis already initialized!");
  40   MF = new MachineFunction(&F, TM, NextFnNum++,
  41                            getAnalysis<MachineModuleInfo>().getContext());
  42   return false;
  43 }
  44
  45 void MachineFunctionAnalysis::releaseMemory() {
  46   delete MF;
  47   MF = 0;
  48 }
  49
  50 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  51   AU.setPreservesAll();
  52   AU.addRequired<MachineModuleInfo>();
  53 }