Factor GC metadata table assembly generation out of Collector in preparation for splitting AsmPrinter into its own library.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54881 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 212 insertions, 0 deletions

diff --git a/lib/CodeGen/GCMetadata.cpp b/lib/CodeGen/GCMetadata.cpp
new file mode 100644
index 0000000..c02a73b
--- /dev/null
+++ b/lib/CodeGen/GCMetadata.cpp
@@ -0,0 +1,212 @@
+//===-- CollectorMetadata.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 CollectorMetadata and CollectorModuleMetadata
+// classes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCMetadata.h"
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/Pass.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Function.h"
+#include "llvm/Support/Compiler.h"
+
+using namespace llvm;
+
+namespace {
+  
+  class VISIBILITY_HIDDEN Printer : public FunctionPass {
+    static char ID;
+    std::ostream &OS;
+    
+  public:
+    explicit Printer(std::ostream &OS = *cerr);
+    
+    const char *getPassName() const;
+    void getAnalysisUsage(AnalysisUsage &AU) const;
+    
+    bool runOnFunction(Function &F);
+  };
+  
+  class VISIBILITY_HIDDEN 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<CollectorModuleMetadata>
+X("collector-metadata", "Create Garbage Collector Module Metadata");
+
+// -----------------------------------------------------------------------------
+
+CollectorMetadata::CollectorMetadata(const Function &F, Collector &C)
+  : F(F), C(C), FrameSize(~0LL) {}
+
+CollectorMetadata::~CollectorMetadata() {}
+
+// -----------------------------------------------------------------------------
+
+char CollectorModuleMetadata::ID = 0;
+
+CollectorModuleMetadata::CollectorModuleMetadata()
+  : ImmutablePass((intptr_t)&ID) {}
+
+CollectorModuleMetadata::~CollectorModuleMetadata() {
+  clear();
+}
+
+Collector *CollectorModuleMetadata::
+getOrCreateCollector(const Module *M, const std::string &Name) {
+  const char *Start = Name.c_str();
+  
+  collector_map_type::iterator NMI = NameMap.find(Start, Start + Name.size());
+  if (NMI != NameMap.end())
+    return NMI->getValue();
+  
+  for (CollectorRegistry::iterator I = CollectorRegistry::begin(),
+                                   E = CollectorRegistry::end(); I != E; ++I) {
+    if (strcmp(Start, I->getName()) == 0) {
+      Collector *C = I->instantiate();
+      C->M = M;
+      C->Name = Name;
+      NameMap.GetOrCreateValue(Start, Start + Name.size()).setValue(C);
+      Collectors.push_back(C);
+      return C;
+    }
+  }
+  
+  cerr << "unsupported collector: " << Name << "\n";
+  abort();
+}
+
+CollectorMetadata &CollectorModuleMetadata::get(const Function &F) {
+  assert(F.hasCollector());
+  function_map_type::iterator I = Map.find(&F);
+  if (I != Map.end())
+    return *I->second;
+    
+  Collector *C = getOrCreateCollector(F.getParent(), F.getCollector());
+  CollectorMetadata *MD = C->insertFunctionMetadata(F);
+  Map[&F] = MD;
+  return *MD;
+}
+
+void CollectorModuleMetadata::clear() {
+  Map.clear();
+  NameMap.clear();
+  
+  for (iterator I = begin(), E = end(); I != E; ++I)
+    delete *I;
+  Collectors.clear();
+}
+
+// -----------------------------------------------------------------------------
+
+char Printer::ID = 0;
+
+FunctionPass *llvm::createCollectorMetadataPrinter(std::ostream &OS) {
+  return new Printer(OS);
+}
+
+Printer::Printer(std::ostream &OS)
+  : FunctionPass(intptr_t(&ID)), OS(OS) {}
+
+const char *Printer::getPassName() const {
+  return "Print Garbage Collector Information";
+}
+
+void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
+  FunctionPass::getAnalysisUsage(AU);
+  AU.setPreservesAll();
+  AU.addRequired<CollectorModuleMetadata>();
+}
+
+static const char *DescKind(GC::PointKind Kind) {
+  switch (Kind) {
+    default: assert(0 && "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.hasCollector()) {
+    CollectorMetadata *FD = &getAnalysis<CollectorModuleMetadata>().get(F);
+    
+    OS << "GC roots for " << FD->getFunction().getNameStart() << ":\n";
+    for (CollectorMetadata::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().getNameStart() << ":\n";
+    for (CollectorMetadata::iterator PI = FD->begin(),
+                                     PE = FD->end(); PI != PE; ++PI) {
+      
+      OS << "\tlabel " << PI->Num << ": " << DescKind(PI->Kind) << ", live = {";
+      
+      for (CollectorMetadata::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::createCollectorMetadataDeleter() {
+  return new Deleter();
+}
+
+Deleter::Deleter() : FunctionPass(intptr_t(&ID)) {}
+
+const char *Deleter::getPassName() const {
+  return "Delete Garbage Collector Information";
+}
+
+void Deleter::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesAll();
+  AU.addRequired<CollectorModuleMetadata>();
+}
+
+bool Deleter::runOnFunction(Function &MF) {
+  return false;
+}
+
+bool Deleter::doFinalization(Module &M) {
+  CollectorModuleMetadata *CMM = getAnalysisToUpdate<CollectorModuleMetadata>();
+  assert(CMM && "Deleter didn't require CollectorModuleMetadata?!");
+  CMM->clear();
+  return false;
+}