Check in LLVM r95781.
diff --git a/lib/CodeGen/GCMetadata.cpp b/lib/CodeGen/GCMetadata.cpp
new file mode 100644
index 0000000..055172b
--- /dev/null
+++ b/lib/CodeGen/GCMetadata.cpp
@@ -0,0 +1,210 @@
+//===-- GCMetadata.cpp - Garbage collector metadata -----------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the GCFunctionInfo class and GCModuleInfo pass.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCMetadata.h"
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/Pass.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Function.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+
+ class Printer : public FunctionPass {
+ static char ID;
+ raw_ostream &OS;
+
+ public:
+ Printer() : FunctionPass(&ID), OS(errs()) {}
+ explicit Printer(raw_ostream &OS) : FunctionPass(&ID), OS(OS) {}
+
+
+ const char *getPassName() const;
+ void getAnalysisUsage(AnalysisUsage &AU) const;
+
+ bool runOnFunction(Function &F);
+ };
+
+ class Deleter : public FunctionPass {
+ static char ID;
+
+ public:
+ Deleter();
+
+ const char *getPassName() const;
+ void getAnalysisUsage(AnalysisUsage &AU) const;
+
+ bool runOnFunction(Function &F);
+ bool doFinalization(Module &M);
+ };
+
+}
+
+static RegisterPass<GCModuleInfo>
+X("collector-metadata", "Create Garbage Collector Module Metadata");
+
+// -----------------------------------------------------------------------------
+
+GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
+ : F(F), S(S), FrameSize(~0LL) {}
+
+GCFunctionInfo::~GCFunctionInfo() {}
+
+// -----------------------------------------------------------------------------
+
+char GCModuleInfo::ID = 0;
+
+GCModuleInfo::GCModuleInfo()
+ : ImmutablePass(&ID) {}
+
+GCModuleInfo::~GCModuleInfo() {
+ clear();
+}
+
+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()) {
+ GCStrategy *S = I->instantiate();
+ S->M = M;
+ S->Name = Name;
+ StrategyMap.GetOrCreateValue(Name).setValue(S);
+ StrategyList.push_back(S);
+ return S;
+ }
+ }
+
+ dbgs() << "unsupported GC: " << Name << "\n";
+ llvm_unreachable(0);
+}
+
+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);
+ FInfoMap[&F] = GFI;
+ return *GFI;
+}
+
+void GCModuleInfo::clear() {
+ FInfoMap.clear();
+ StrategyMap.clear();
+
+ for (iterator I = begin(), E = end(); I != E; ++I)
+ delete *I;
+ StrategyList.clear();
+}
+
+// -----------------------------------------------------------------------------
+
+char Printer::ID = 0;
+
+FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
+ return new Printer(OS);
+}
+
+
+const char *Printer::getPassName() const {
+ return "Print Garbage Collector Information";
+}
+
+void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
+ FunctionPass::getAnalysisUsage(AU);
+ AU.setPreservesAll();
+ AU.addRequired<GCModuleInfo>();
+}
+
+static const char *DescKind(GC::PointKind Kind) {
+ switch (Kind) {
+ default: llvm_unreachable("Unknown GC point kind");
+ case GC::Loop: return "loop";
+ case GC::Return: return "return";
+ case GC::PreCall: return "pre-call";
+ case GC::PostCall: return "post-call";
+ }
+}
+
+bool Printer::runOnFunction(Function &F) {
+ if (!F.hasGC()) {
+ GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
+
+ OS << "GC roots for " << FD->getFunction().getNameStr() << ":\n";
+ for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
+ RE = FD->roots_end(); RI != RE; ++RI)
+ OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
+
+ OS << "GC safe points for " << FD->getFunction().getNameStr() << ":\n";
+ for (GCFunctionInfo::iterator PI = FD->begin(),
+ PE = FD->end(); PI != PE; ++PI) {
+
+ OS << "\tlabel " << PI->Num << ": " << DescKind(PI->Kind) << ", live = {";
+
+ for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
+ RE = FD->live_end(PI);;) {
+ OS << " " << RI->Num;
+ if (++RI == RE)
+ break;
+ OS << ",";
+ }
+
+ OS << " }\n";
+ }
+ }
+
+ return false;
+}
+
+// -----------------------------------------------------------------------------
+
+char Deleter::ID = 0;
+
+FunctionPass *llvm::createGCInfoDeleter() {
+ return new Deleter();
+}
+
+Deleter::Deleter() : FunctionPass(&ID) {}
+
+const char *Deleter::getPassName() const {
+ return "Delete Garbage Collector Information";
+}
+
+void Deleter::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ AU.addRequired<GCModuleInfo>();
+}
+
+bool Deleter::runOnFunction(Function &MF) {
+ return false;
+}
+
+bool Deleter::doFinalization(Module &M) {
+ GCModuleInfo *GMI = getAnalysisIfAvailable<GCModuleInfo>();
+ assert(GMI && "Deleter didn't require GCModuleInfo?!");
+ GMI->clear();
+ return false;
+}