lib/CodeGen/GCMetadata.cpp

   1 //===-- GCMetadata.cpp - Garbage collector metadata -----------------------===//
   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 implements the GCFunctionInfo class and GCModuleInfo pass.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/GCMetadata.h"
  15 #include "llvm/CodeGen/GCStrategy.h"
  16 #include "llvm/CodeGen/MachineFrameInfo.h"
  17 #include "llvm/Pass.h"
  18 #include "llvm/CodeGen/Passes.h"
  19 #include "llvm/Function.h"
  20 #include "llvm/MC/MCSymbol.h"
  21 #include "llvm/Support/Debug.h"
  22 #include "llvm/Support/ErrorHandling.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 using namespace llvm;
  25
  26 namespace {
  27
  28   class Printer : public FunctionPass {
  29     static char ID;
  30     raw_ostream &OS;
  31
  32   public:
  33     explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
  34
  35
  36     const char *getPassName() const;
  37     void getAnalysisUsage(AnalysisUsage &AU) const;
  38
  39     bool runOnFunction(Function &F);
  40   };
  41
  42   class Deleter : public FunctionPass {
  43     static char ID;
  44
  45   public:
  46     Deleter();
  47
  48     const char *getPassName() const;
  49     void getAnalysisUsage(AnalysisUsage &AU) const;
  50
  51     bool runOnFunction(Function &F);
  52     bool doFinalization(Module &M);
  53   };
  54
  55 }
  56
  57 INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
  58                 "Create Garbage Collector Module Metadata", false, false)
  59
  60 // -----------------------------------------------------------------------------
  61
  62 GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
  63   : F(F), S(S), FrameSize(~0LL) {}
  64
  65 GCFunctionInfo::~GCFunctionInfo() {}
  66
  67 // -----------------------------------------------------------------------------
  68
  69 char GCModuleInfo::ID = 0;
  70
  71 GCModuleInfo::GCModuleInfo()
  72     : ImmutablePass(ID) {
  73   initializeGCModuleInfoPass(*PassRegistry::getPassRegistry());
  74 }
  75
  76 GCModuleInfo::~GCModuleInfo() {
  77   clear();
  78 }
  79
  80 GCStrategy *GCModuleInfo::getOrCreateStrategy(const Module *M,
  81                                               const std::string &Name) {
  82   strategy_map_type::iterator NMI = StrategyMap.find(Name);
  83   if (NMI != StrategyMap.end())
  84     return NMI->getValue();
  85
  86   for (GCRegistry::iterator I = GCRegistry::begin(),
  87                             E = GCRegistry::end(); I != E; ++I) {
  88     if (Name == I->getName()) {
  89       GCStrategy *S = I->instantiate();
  90       S->M = M;
  91       S->Name = Name;
  92       StrategyMap.GetOrCreateValue(Name).setValue(S);
  93       StrategyList.push_back(S);
  94       return S;
  95     }
  96   }
  97
  98   dbgs() << "unsupported GC: " << Name << "\n";
  99   llvm_unreachable(0);
 100 }
 101
 102 GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
 103   assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
 104   assert(F.hasGC());
 105
 106   finfo_map_type::iterator I = FInfoMap.find(&F);
 107   if (I != FInfoMap.end())
 108     return *I->second;
 109
 110   GCStrategy *S = getOrCreateStrategy(F.getParent(), F.getGC());
 111   GCFunctionInfo *GFI = S->insertFunctionInfo(F);
 112   FInfoMap[&F] = GFI;
 113   return *GFI;
 114 }
 115
 116 void GCModuleInfo::clear() {
 117   FInfoMap.clear();
 118   StrategyMap.clear();
 119
 120   for (iterator I = begin(), E = end(); I != E; ++I)
 121     delete *I;
 122   StrategyList.clear();
 123 }
 124
 125 // -----------------------------------------------------------------------------
 126
 127 char Printer::ID = 0;
 128
 129 FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
 130   return new Printer(OS);
 131 }
 132
 133
 134 const char *Printer::getPassName() const {
 135   return "Print Garbage Collector Information";
 136 }
 137
 138 void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
 139   FunctionPass::getAnalysisUsage(AU);
 140   AU.setPreservesAll();
 141   AU.addRequired<GCModuleInfo>();
 142 }
 143
 144 static const char *DescKind(GC::PointKind Kind) {
 145   switch (Kind) {
 146     default: llvm_unreachable("Unknown GC point kind");
 147     case GC::Loop:     return "loop";
 148     case GC::Return:   return "return";
 149     case GC::PreCall:  return "pre-call";
 150     case GC::PostCall: return "post-call";
 151   }
 152 }
 153
 154 bool Printer::runOnFunction(Function &F) {
 155   if (F.hasGC()) return false;
 156
 157   GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
 158
 159   OS << "GC roots for " << FD->getFunction().getNameStr() << ":\n";
 160   for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
 161                                       RE = FD->roots_end(); RI != RE; ++RI)
 162     OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
 163
 164   OS << "GC safe points for " << FD->getFunction().getNameStr() << ":\n";
 165   for (GCFunctionInfo::iterator PI = FD->begin(),
 166                                 PE = FD->end(); PI != PE; ++PI) {
 167
 168     OS << "\t" << PI->Label->getName() << ": "
 169        << DescKind(PI->Kind) << ", live = {";
 170
 171     for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
 172                                        RE = FD->live_end(PI);;) {
 173       OS << " " << RI->Num;
 174       if (++RI == RE)
 175         break;
 176       OS << ",";
 177     }
 178
 179     OS << " }\n";
 180   }
 181
 182   return false;
 183 }
 184
 185 // -----------------------------------------------------------------------------
 186
 187 char Deleter::ID = 0;
 188
 189 FunctionPass *llvm::createGCInfoDeleter() {
 190   return new Deleter();
 191 }
 192
 193 Deleter::Deleter() : FunctionPass(ID) {}
 194
 195 const char *Deleter::getPassName() const {
 196   return "Delete Garbage Collector Information";
 197 }
 198
 199 void Deleter::getAnalysisUsage(AnalysisUsage &AU) const {
 200   AU.setPreservesAll();
 201   AU.addRequired<GCModuleInfo>();
 202 }
 203
 204 bool Deleter::runOnFunction(Function &MF) {
 205   return false;
 206 }
 207
 208 bool Deleter::doFinalization(Module &M) {
 209   GCModuleInfo *GMI = getAnalysisIfAvailable<GCModuleInfo>();
 210   assert(GMI && "Deleter didn't require GCModuleInfo?!");
 211   GMI->clear();
 212   return false;
 213 }