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, 0 insertions, 407 deletions

diff --git a/lib/CodeGen/Collector.cpp b/lib/CodeGen/Collector.cpp
deleted file mode 100644
index 6fd018961a..0000000000
--- a/lib/CodeGen/Collector.cpp
+++ /dev/null
@@ -1,407 +0,0 @@
-//===-- Collector.cpp - Garbage collection infrastructure -----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements target- and collector-independent garbage collection
-// infrastructure.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/Collector.h"
-#include "llvm/CodeGen/Passes.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/Target/TargetFrameInfo.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Support/Compiler.h"
-
-using namespace llvm;
-
-namespace {
-  
-  /// LowerIntrinsics - This pass rewrites calls to the llvm.gcread or
-  /// llvm.gcwrite intrinsics, replacing them with simple loads and stores as 
-  /// directed by the Collector. It also performs automatic root initialization
-  /// and custom intrinsic lowering.
-  class VISIBILITY_HIDDEN LowerIntrinsics : public FunctionPass {
-    static bool NeedsDefaultLoweringPass(const Collector &C);
-    static bool NeedsCustomLoweringPass(const Collector &C);
-    static bool CouldBecomeSafePoint(Instruction *I);
-    bool PerformDefaultLowering(Function &F, Collector &Coll);
-    static bool InsertRootInitializers(Function &F,
-                                       AllocaInst **Roots, unsigned Count);
-    
-  public:
-    static char ID;
-    
-    LowerIntrinsics();
-    const char *getPassName() const;
-    void getAnalysisUsage(AnalysisUsage &AU) const;
-    
-    bool doInitialization(Module &M);
-    bool runOnFunction(Function &F);
-  };
-  
-  
-  /// MachineCodeAnalysis - This is a target-independent pass over the machine 
-  /// function representation to identify safe points for the garbage collector
-  /// in the machine code. It inserts labels at safe points and populates a
-  /// CollectorMetadata record for each function.
-  class VISIBILITY_HIDDEN MachineCodeAnalysis : public MachineFunctionPass {
-    const TargetMachine *TM;
-    CollectorMetadata *MD;
-    MachineModuleInfo *MMI;
-    const TargetInstrInfo *TII;
-    MachineFrameInfo *MFI;
-    
-    void FindSafePoints(MachineFunction &MF);
-    void VisitCallPoint(MachineBasicBlock::iterator MI);
-    unsigned InsertLabel(MachineBasicBlock &MBB, 
-                         MachineBasicBlock::iterator MI) const;
-    
-    void FindStackOffsets(MachineFunction &MF);
-    
-  public:
-    static char ID;
-    
-    MachineCodeAnalysis();
-    const char *getPassName() const;
-    void getAnalysisUsage(AnalysisUsage &AU) const;
-    
-    bool runOnMachineFunction(MachineFunction &MF);
-  };
-  
-}
-
-// -----------------------------------------------------------------------------
-
-Collector::Collector() :
-  NeededSafePoints(0),
-  CustomReadBarriers(false),
-  CustomWriteBarriers(false),
-  CustomRoots(false),
-  InitRoots(true),
-  UsesMetadata(false)
-{}
-
-Collector::~Collector() {
-  for (iterator I = begin(), E = end(); I != E; ++I)
-    delete *I;
-  
-  Functions.clear();
-}
- 
-bool Collector::initializeCustomLowering(Module &M) { return false; }
- 
-bool Collector::performCustomLowering(Function &F) {
-  cerr << "gc " << getName() << " must override performCustomLowering.\n";
-  abort();
-  return 0;
-}
-    
-CollectorMetadata *Collector::insertFunctionMetadata(const Function &F) {
-  CollectorMetadata *CM = new CollectorMetadata(F, *this);
-  Functions.push_back(CM);
-  return CM;
-} 
-
-// -----------------------------------------------------------------------------
-
-GCMetadataPrinter::GCMetadataPrinter() { }
-
-GCMetadataPrinter::~GCMetadataPrinter() { }
-
-void GCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
-                                      const TargetAsmInfo &TAI) {
-  // Default is no action.
-}
-
-void GCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
-                                       const TargetAsmInfo &TAI) {
-  // Default is no action.
-}
-
-// -----------------------------------------------------------------------------
-
-FunctionPass *llvm::createGCLoweringPass() {
-  return new LowerIntrinsics();
-}
- 
-char LowerIntrinsics::ID = 0;
-
-LowerIntrinsics::LowerIntrinsics()
-  : FunctionPass((intptr_t)&ID) {}
-
-const char *LowerIntrinsics::getPassName() const {
-  return "Lower Garbage Collection Instructions";
-}
-    
-void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
-  FunctionPass::getAnalysisUsage(AU);
-  AU.addRequired<CollectorModuleMetadata>();
-}
-
-/// doInitialization - If this module uses the GC intrinsics, find them now.
-bool LowerIntrinsics::doInitialization(Module &M) {
-  // FIXME: This is rather antisocial in the context of a JIT since it performs
-  //        work against the entire module. But this cannot be done at
-  //        runFunction time (initializeCustomLowering likely needs to change
-  //        the module).
-  CollectorModuleMetadata *CMM = getAnalysisToUpdate<CollectorModuleMetadata>();
-  assert(CMM && "LowerIntrinsics didn't require CollectorModuleMetadata!?");
-  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
-    if (I->hasCollector())
-      CMM->get(*I); // Instantiate the Collector.
-  
-  bool MadeChange = false;
-  for (CollectorModuleMetadata::iterator I = CMM->begin(),
-                                         E = CMM->end(); I != E; ++I)
-    if (NeedsCustomLoweringPass(**I))
-      if ((*I)->initializeCustomLowering(M))
-        MadeChange = true;
-  
-  return MadeChange;
-}
-
-bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots, 
-                                                          unsigned Count) {
-  // Scroll past alloca instructions.
-  BasicBlock::iterator IP = F.getEntryBlock().begin();
-  while (isa<AllocaInst>(IP)) ++IP;
-  
-  // Search for initializers in the initial BB.
-  SmallPtrSet<AllocaInst*,16> InitedRoots;
-  for (; !CouldBecomeSafePoint(IP); ++IP)
-    if (StoreInst *SI = dyn_cast<StoreInst>(IP))
-      if (AllocaInst *AI =
-          dyn_cast<AllocaInst>(SI->getOperand(1)->stripPointerCasts()))
-        InitedRoots.insert(AI);
-  
-  // Add root initializers.
-  bool MadeChange = false;
-  
-  for (AllocaInst **I = Roots, **E = Roots + Count; I != E; ++I)
-    if (!InitedRoots.count(*I)) {
-      new StoreInst(ConstantPointerNull::get(cast<PointerType>(
-                      cast<PointerType>((*I)->getType())->getElementType())),
-                    *I, IP);
-      MadeChange = true;
-    }
-  
-  return MadeChange;
-}
-
-bool LowerIntrinsics::NeedsDefaultLoweringPass(const Collector &C) {
-  // Default lowering is necessary only if read or write barriers have a default
-  // action. The default for roots is no action.
-  return !C.customWriteBarrier()
-      || !C.customReadBarrier()
-      || C.initializeRoots();
-}
-
-bool LowerIntrinsics::NeedsCustomLoweringPass(const Collector &C) {
-  // Custom lowering is only necessary if enabled for some action.
-  return C.customWriteBarrier()
-      || C.customReadBarrier()
-      || C.customRoots();
-}
-
-/// CouldBecomeSafePoint - Predicate to conservatively determine whether the
-/// instruction could introduce a safe point.
-bool LowerIntrinsics::CouldBecomeSafePoint(Instruction *I) {
-  // The natural definition of instructions which could introduce safe points
-  // are:
-  // 
-  //   - call, invoke (AfterCall, BeforeCall)
-  //   - phis (Loops)
-  //   - invoke, ret, unwind (Exit)
-  // 
-  // However, instructions as seemingly inoccuous as arithmetic can become
-  // libcalls upon lowering (e.g., div i64 on a 32-bit platform), so instead
-  // it is necessary to take a conservative approach.
-  
-  if (isa<AllocaInst>(I) || isa<GetElementPtrInst>(I) ||
-      isa<StoreInst>(I) || isa<LoadInst>(I))
-    return false;
-  
-  // llvm.gcroot is safe because it doesn't do anything at runtime.
-  if (CallInst *CI = dyn_cast<CallInst>(I))
-    if (Function *F = CI->getCalledFunction())
-      if (unsigned IID = F->getIntrinsicID())
-        if (IID == Intrinsic::gcroot)
-          return false;
-  
-  return true;
-}
-
-/// runOnFunction - Replace gcread/gcwrite intrinsics with loads and stores.
-/// Leave gcroot intrinsics; the code generator needs to see those.
-bool LowerIntrinsics::runOnFunction(Function &F) {
-  // Quick exit for functions that do not use GC.
-  if (!F.hasCollector()) return false;
-  
-  CollectorMetadata &MD = getAnalysis<CollectorModuleMetadata>().get(F);
-  Collector &Coll = MD.getCollector();
-  
-  bool MadeChange = false;
-  
-  if (NeedsDefaultLoweringPass(Coll))
-    MadeChange |= PerformDefaultLowering(F, Coll);
-  
-  if (NeedsCustomLoweringPass(Coll))
-    MadeChange |= Coll.performCustomLowering(F);
-  
-  return MadeChange;
-}
-
-bool LowerIntrinsics::PerformDefaultLowering(Function &F, Collector &Coll) {
-  bool LowerWr = !Coll.customWriteBarrier();
-  bool LowerRd = !Coll.customReadBarrier();
-  bool InitRoots = Coll.initializeRoots();
-  
-  SmallVector<AllocaInst*,32> Roots;
-  
-  bool MadeChange = false;
-  for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
-    for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E;) {
-      if (IntrinsicInst *CI = dyn_cast<IntrinsicInst>(II++)) {
-        Function *F = CI->getCalledFunction();
-        switch (F->getIntrinsicID()) {
-        case Intrinsic::gcwrite:
-          if (LowerWr) {
-            // Replace a write barrier with a simple store.
-            Value *St = new StoreInst(CI->getOperand(1), CI->getOperand(3), CI);
-            CI->replaceAllUsesWith(St);
-            CI->eraseFromParent();
-          }
-          break;
-        case Intrinsic::gcread:
-          if (LowerRd) {
-            // Replace a read barrier with a simple load.
-            Value *Ld = new LoadInst(CI->getOperand(2), "", CI);
-            Ld->takeName(CI);
-            CI->replaceAllUsesWith(Ld);
-            CI->eraseFromParent();
-          }
-          break;
-        case Intrinsic::gcroot:
-          if (InitRoots) {
-            // Initialize the GC root, but do not delete the intrinsic. The
-            // backend needs the intrinsic to flag the stack slot.
-            Roots.push_back(cast<AllocaInst>(
-                              CI->getOperand(1)->stripPointerCasts()));
-          }
-          break;
-        default:
-          continue;
-        }
-        
-        MadeChange = true;
-      }
-    }
-  }
-  
-  if (Roots.size())
-    MadeChange |= InsertRootInitializers(F, Roots.begin(), Roots.size());
-  
-  return MadeChange;
-}
-
-// -----------------------------------------------------------------------------
-
-FunctionPass *llvm::createGCMachineCodeAnalysisPass() {
-  return new MachineCodeAnalysis();
-}
-
-char MachineCodeAnalysis::ID = 0;
-
-MachineCodeAnalysis::MachineCodeAnalysis()
-  : MachineFunctionPass(intptr_t(&ID)) {}
-
-const char *MachineCodeAnalysis::getPassName() const {
-  return "Analyze Machine Code For Garbage Collection";
-}
-
-void MachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
-  MachineFunctionPass::getAnalysisUsage(AU);
-  AU.setPreservesAll();
-  AU.addRequired<MachineModuleInfo>();
-  AU.addRequired<CollectorModuleMetadata>();
-}
-
-unsigned MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB, 
-                                     MachineBasicBlock::iterator MI) const {
-  unsigned Label = MMI->NextLabelID();
-  BuildMI(MBB, MI, TII->get(TargetInstrInfo::GC_LABEL)).addImm(Label);
-  return Label;
-}
-
-void MachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
-  // Find the return address (next instruction), too, so as to bracket the call
-  // instruction.
-  MachineBasicBlock::iterator RAI = CI; 
-  ++RAI;                                
-  
-  if (MD->getCollector().needsSafePoint(GC::PreCall))
-    MD->addSafePoint(GC::PreCall, InsertLabel(*CI->getParent(), CI));
-  
-  if (MD->getCollector().needsSafePoint(GC::PostCall))
-    MD->addSafePoint(GC::PostCall, InsertLabel(*CI->getParent(), RAI));
-}
-
-void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
-  for (MachineFunction::iterator BBI = MF.begin(),
-                                 BBE = MF.end(); BBI != BBE; ++BBI)
-    for (MachineBasicBlock::iterator MI = BBI->begin(),
-                                     ME = BBI->end(); MI != ME; ++MI)
-      if (MI->getDesc().isCall())
-        VisitCallPoint(MI);
-}
-
-void MachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
-  uint64_t StackSize = MFI->getStackSize();
-  uint64_t OffsetAdjustment = MFI->getOffsetAdjustment();
-  uint64_t OffsetOfLocalArea = TM->getFrameInfo()->getOffsetOfLocalArea();
-  
-  for (CollectorMetadata::roots_iterator RI = MD->roots_begin(),
-                                         RE = MD->roots_end(); RI != RE; ++RI)
-    RI->StackOffset = MFI->getObjectOffset(RI->Num) + StackSize
-                      - OffsetOfLocalArea + OffsetAdjustment;
-}
-
-bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
-  // Quick exit for functions that do not use GC.
-  if (!MF.getFunction()->hasCollector()) return false;
-  
-  MD = &getAnalysis<CollectorModuleMetadata>().get(*MF.getFunction());
-  if (!MD->getCollector().needsSafePoints())
-    return false;
-  
-  TM = &MF.getTarget();
-  MMI = &getAnalysis<MachineModuleInfo>();
-  TII = TM->getInstrInfo();
-  MFI = MF.getFrameInfo();
-  
-  // Find the size of the stack frame.
-  MD->setFrameSize(MFI->getStackSize());
-  
-  // Find all safe points.
-  FindSafePoints(MF);
-  
-  // Find the stack offsets for all roots.
-  FindStackOffsets(MF);
-  
-  return false;
-}