MachineFunctionAnalysis.cpp revision 7569322765651f19eea0609fb082e6b267d5d2b5 
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"
17using namespace llvm;
18
19// Register this pass with PassInfo directly to avoid having to define
20// a default constructor.
21static PassInfo
22X("Machine Function Analysis", "machine-function-analysis",
23   &MachineFunctionAnalysis::ID, 0,
24  /*CFGOnly=*/false, /*is_analysis=*/true);
25
26char MachineFunctionAnalysis::ID = 0;
27
28MachineFunctionAnalysis::MachineFunctionAnalysis(const TargetMachine &tm,
29                                                 CodeGenOpt::Level OL) :
30  FunctionPass(ID), TM(tm), OptLevel(OL), MF(0) {
31}
32
33MachineFunctionAnalysis::~MachineFunctionAnalysis() {
34  releaseMemory();
35  assert(!MF && "MachineFunctionAnalysis left initialized!");
36}
37
38void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
39  AU.setPreservesAll();
40  AU.addRequired<MachineModuleInfo>();
41}
42
43bool MachineFunctionAnalysis::doInitialization(Module &M) {
44  MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
45  assert(MMI && "MMI not around yet??");
46  MMI->setModule(&M);
47  NextFnNum = 0;
48  return false;
49}
50
51
52bool MachineFunctionAnalysis::runOnFunction(Function &F) {
53  assert(!MF && "MachineFunctionAnalysis already initialized!");
54  MF = new MachineFunction(&F, TM, NextFnNum++,
55                           getAnalysis<MachineModuleInfo>());
56  return false;
57}
58
59void MachineFunctionAnalysis::releaseMemory() {
60  delete MF;
61  MF = 0;
62}
63