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