X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FGCMetadata.cpp;h=c8116a453d2dc6567309e6dafece6d0d3a7aab87;hb=f7566237848be2bd3276d1445da5ab5ebc5a359e;hp=5b03d6bb5db86f7bb3e91e29c05a4c1531b29445;hpb=3490d23337b1bb4257c7109a09dfa3baeb02f90d;p=oota-llvm.git

diff --git a/lib/CodeGen/GCMetadata.cpp b/lib/CodeGen/GCMetadata.cpp
index 5b03d6bb5db..c8116a453d2 100644
--- a/lib/CodeGen/GCMetadata.cpp
+++ b/lib/CodeGen/GCMetadata.cpp
@@ -24,22 +24,20 @@
 using namespace llvm;
 
 namespace {
-  
-  class Printer : public FunctionPass {
-    static char ID;
-    raw_ostream &OS;
-    
-  public:
-    explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
 
+class Printer : public FunctionPass {
+  static char ID;
+  raw_ostream &OS;
 
-    const char *getPassName() const override;
-    void getAnalysisUsage(AnalysisUsage &AU) const override;
+public:
+  explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
 
-    bool runOnFunction(Function &F) override;
-    bool doFinalization(Module &M) override;
-  };
+  const char *getPassName() const override;
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
 
+  bool runOnFunction(Function &F) override;
+  bool doFinalization(Module &M) override;
+};
 }
 
 INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
@@ -48,7 +46,7 @@ INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
 // -----------------------------------------------------------------------------
 
 GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
-  : F(F), S(S), FrameSize(~0LL) {}
+    : F(F), S(S), FrameSize(~0LL) {}
 
 GCFunctionInfo::~GCFunctionInfo() {}
 
@@ -56,50 +54,29 @@ GCFunctionInfo::~GCFunctionInfo() {}
 
 char GCModuleInfo::ID = 0;
 
-GCModuleInfo::GCModuleInfo()
-    : ImmutablePass(ID) {
+GCModuleInfo::GCModuleInfo() : ImmutablePass(ID) {
   initializeGCModuleInfoPass(*PassRegistry::getPassRegistry());
 }
 
-GCStrategy *GCModuleInfo::getOrCreateStrategy(const Module *M,
-                                              const std::string &Name) {
-  strategy_map_type::iterator NMI = StrategyMap.find(Name);
-  if (NMI != StrategyMap.end())
-    return NMI->getValue();
-  
-  for (GCRegistry::iterator I = GCRegistry::begin(),
-                            E = GCRegistry::end(); I != E; ++I) {
-    if (Name == I->getName()) {
-      std::unique_ptr<GCStrategy> S = I->instantiate();
-      S->Name = Name;
-      StrategyMap[Name] = S.get();
-      StrategyList.push_back(std::move(S));
-      return StrategyList.back().get();
-    }
-  }
- 
-  dbgs() << "unsupported GC: " << Name << "\n";
-  llvm_unreachable(nullptr);
-}
-
 GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
   assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
   assert(F.hasGC());
-  
+
   finfo_map_type::iterator I = FInfoMap.find(&F);
   if (I != FInfoMap.end())
     return *I->second;
-  
-  GCStrategy *S = getOrCreateStrategy(F.getParent(), F.getGC());
-  GCFunctionInfo *GFI = S->insertFunctionInfo(F);
+
+  GCStrategy *S = getGCStrategy(F.getGC());
+  Functions.push_back(make_unique<GCFunctionInfo>(F, *S));
+  GCFunctionInfo *GFI = Functions.back().get();
   FInfoMap[&F] = GFI;
   return *GFI;
 }
 
 void GCModuleInfo::clear() {
+  Functions.clear();
   FInfoMap.clear();
-  StrategyMap.clear();
-  StrategyList.clear();
+  GCStrategyList.clear();
 }
 
 // -----------------------------------------------------------------------------
@@ -110,7 +87,6 @@ FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
   return new Printer(OS);
 }
 
-
 const char *Printer::getPassName() const {
   return "Print Garbage Collector Information";
 }
@@ -123,42 +99,45 @@ void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
 
 static const char *DescKind(GC::PointKind Kind) {
   switch (Kind) {
-    case GC::Loop:     return "loop";
-    case GC::Return:   return "return";
-    case GC::PreCall:  return "pre-call";
-    case GC::PostCall: return "post-call";
+  case GC::PreCall:
+    return "pre-call";
+  case GC::PostCall:
+    return "post-call";
   }
   llvm_unreachable("Invalid point kind");
 }
 
 bool Printer::runOnFunction(Function &F) {
-  if (F.hasGC()) return false;
-  
+  if (F.hasGC())
+    return false;
+
   GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
-  
+
   OS << "GC roots for " << FD->getFunction().getName() << ":\n";
   for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
-                                      RE = FD->roots_end(); RI != RE; ++RI)
+                                      RE = FD->roots_end();
+       RI != RE; ++RI)
     OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
-  
+
   OS << "GC safe points for " << FD->getFunction().getName() << ":\n";
-  for (GCFunctionInfo::iterator PI = FD->begin(),
-                                PE = FD->end(); PI != PE; ++PI) {
-    
-    OS << "\t" << PI->Label->getName() << ": "
-       << DescKind(PI->Kind) << ", live = {";
-    
+  for (GCFunctionInfo::iterator PI = FD->begin(), PE = FD->end(); PI != PE;
+       ++PI) {
+
+    OS << "\t" << PI->Label->getName() << ": " << DescKind(PI->Kind)
+       << ", live = {";
+
     for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
-                                       RE = FD->live_end(PI);;) {
+                                       RE = FD->live_end(PI);
+         ;) {
       OS << " " << RI->Num;
       if (++RI == RE)
         break;
       OS << ",";
     }
-    
+
     OS << " }\n";
   }
-  
+
   return false;
 }
 
@@ -168,3 +147,31 @@ bool Printer::doFinalization(Module &M) {
   GMI->clear();
   return false;
 }
+
+GCStrategy *GCModuleInfo::getGCStrategy(const StringRef Name) {
+  // TODO: Arguably, just doing a linear search would be faster for small N
+  auto NMI = GCStrategyMap.find(Name);
+  if (NMI != GCStrategyMap.end())
+    return NMI->getValue();
+  
+  for (auto& Entry : GCRegistry::entries()) {
+    if (Name == Entry.getName()) {
+      std::unique_ptr<GCStrategy> S = Entry.instantiate();
+      S->Name = Name;
+      GCStrategyMap[Name] = S.get();
+      GCStrategyList.push_back(std::move(S));
+      return GCStrategyList.back().get();
+    }
+  }
+
+  if (GCRegistry::begin() == GCRegistry::end()) {
+    // In normal operation, the registry should not be empty.  There should 
+    // be the builtin GCs if nothing else.  The most likely scenario here is
+    // that we got here without running the initializers used by the Registry 
+    // itself and it's registration mechanism.
+    const std::string error = ("unsupported GC: " + Name).str() + 
+      " (did you remember to link and initialize the CodeGen library?)";
+    report_fatal_error(error);
+  } else
+    report_fatal_error(std::string("unsupported GC: ") + Name);
+}