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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 char MachineFunctionAnalysis::ID = 0;
21 
MachineFunctionAnalysis(const TargetMachine & tm,CodeGenOpt::Level OL)22 MachineFunctionAnalysis::MachineFunctionAnalysis(const TargetMachine &tm,
23                                                  CodeGenOpt::Level OL) :
24   FunctionPass(ID), TM(tm), OptLevel(OL), MF(0) {
25   initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
26 }
27 
~MachineFunctionAnalysis()28 MachineFunctionAnalysis::~MachineFunctionAnalysis() {
29   releaseMemory();
30   assert(!MF && "MachineFunctionAnalysis left initialized!");
31 }
32 
getAnalysisUsage(AnalysisUsage & AU) const33 void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
34   AU.setPreservesAll();
35   AU.addRequired<MachineModuleInfo>();
36 }
37 
doInitialization(Module & M)38 bool MachineFunctionAnalysis::doInitialization(Module &M) {
39   MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
40   assert(MMI && "MMI not around yet??");
41   MMI->setModule(&M);
42   NextFnNum = 0;
43   return false;
44 }
45 
46 
runOnFunction(Function & F)47 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
48   assert(!MF && "MachineFunctionAnalysis already initialized!");
49   MF = new MachineFunction(&F, TM, NextFnNum++,
50                            getAnalysis<MachineModuleInfo>(),
51                            getAnalysisIfAvailable<GCModuleInfo>());
52   return false;
53 }
54 
releaseMemory()55 void MachineFunctionAnalysis::releaseMemory() {
56   delete MF;
57   MF = 0;
58 }
59