Vendor import of llvm release_30 branch r142614:

http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614

1 files changed, 391 insertions, 4 deletions

diff --git a/lib/VMCore/AutoUpgrade.cpp b/lib/VMCore/AutoUpgrade.cpp
index 9e93ff3..b849d3e 100644
--- a/lib/VMCore/AutoUpgrade.cpp
+++ b/lib/VMCore/AutoUpgrade.cpp
@@ -14,11 +14,15 @@
 #include "llvm/AutoUpgrade.h"
 #include "llvm/Constants.h"
 #include "llvm/Function.h"
+#include "llvm/Instruction.h"
 #include "llvm/LLVMContext.h"
 #include "llvm/Module.h"
 #include "llvm/IntrinsicInst.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/CallSite.h"
+#include "llvm/Support/CFG.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/IRBuilder.h"
 #include <cstring>
@@ -34,11 +38,48 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
     return false;
   Name = Name.substr(5); // Strip off "llvm."
 
-  const FunctionType *FTy = F->getFunctionType();
+  FunctionType *FTy = F->getFunctionType();
   Module *M = F->getParent();
   
   switch (Name[0]) {
   default: break;
+  case 'a':
+    if (Name.startswith("atomic.cmp.swap") ||
+        Name.startswith("atomic.swap") ||
+        Name.startswith("atomic.load.add") ||
+        Name.startswith("atomic.load.sub") ||
+        Name.startswith("atomic.load.and") ||
+        Name.startswith("atomic.load.nand") ||
+        Name.startswith("atomic.load.or") ||
+        Name.startswith("atomic.load.xor") ||
+        Name.startswith("atomic.load.max") ||
+        Name.startswith("atomic.load.min") ||
+        Name.startswith("atomic.load.umax") ||
+        Name.startswith("atomic.load.umin"))
+      return true;
+  case 'i':
+    //  This upgrades the old llvm.init.trampoline to the new
+    //  llvm.init.trampoline and llvm.adjust.trampoline pair.
+    if (Name == "init.trampoline") {
+      // The new llvm.init.trampoline returns nothing.
+      if (FTy->getReturnType()->isVoidTy())
+        break;
+
+      assert(FTy->getNumParams() == 3 && "old init.trampoline takes 3 args!");
+
+      // Change the name of the old intrinsic so that we can play with its type.
+      std::string NameTmp = F->getName();
+      F->setName("");
+      NewFn = cast<Function>(M->getOrInsertFunction(
+                               NameTmp,
+                               Type::getVoidTy(M->getContext()),
+                               FTy->getParamType(0), FTy->getParamType(1),
+                               FTy->getParamType(2), (Type *)0));
+      return true;
+    }
+  case 'm':
+    if (Name == "memory.barrier")
+      return true;
   case 'p':
     //  This upgrades the llvm.prefetch intrinsic to accept one more parameter,
     //  which is a instruction / data cache identifier. The old version only
@@ -139,8 +180,8 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
         F->getName() == "llvm.x86.sse2.loadu.dq" ||
         F->getName() == "llvm.x86.sse2.loadu.pd") {
       // Convert to a native, unaligned load.
-      const Type *VecTy = CI->getType();
-      const Type *IntTy = IntegerType::get(C, 128);
+      Type *VecTy = CI->getType();
+      Type *IntTy = IntegerType::get(C, 128);
       IRBuilder<> Builder(C);
       Builder.SetInsertPoint(CI->getParent(), CI);
 
@@ -182,6 +223,80 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
 
       // Remove intrinsic.
       CI->eraseFromParent();
+    } else if (F->getName().startswith("llvm.atomic.cmp.swap")) {
+      IRBuilder<> Builder(C);
+      Builder.SetInsertPoint(CI->getParent(), CI);
+      Value *Val = Builder.CreateAtomicCmpXchg(CI->getArgOperand(0),
+                                               CI->getArgOperand(1),
+                                               CI->getArgOperand(2),
+                                               Monotonic);
+
+      // Replace intrinsic.
+      Val->takeName(CI);
+      if (!CI->use_empty())
+        CI->replaceAllUsesWith(Val);
+      CI->eraseFromParent();
+    } else if (F->getName().startswith("llvm.atomic")) {
+      IRBuilder<> Builder(C);
+      Builder.SetInsertPoint(CI->getParent(), CI);
+
+      AtomicRMWInst::BinOp Op;
+      if (F->getName().startswith("llvm.atomic.swap"))
+        Op = AtomicRMWInst::Xchg;
+      else if (F->getName().startswith("llvm.atomic.load.add"))
+        Op = AtomicRMWInst::Add;
+      else if (F->getName().startswith("llvm.atomic.load.sub"))
+        Op = AtomicRMWInst::Sub;
+      else if (F->getName().startswith("llvm.atomic.load.and"))
+        Op = AtomicRMWInst::And;
+      else if (F->getName().startswith("llvm.atomic.load.nand"))
+        Op = AtomicRMWInst::Nand;
+      else if (F->getName().startswith("llvm.atomic.load.or"))
+        Op = AtomicRMWInst::Or;
+      else if (F->getName().startswith("llvm.atomic.load.xor"))
+        Op = AtomicRMWInst::Xor;
+      else if (F->getName().startswith("llvm.atomic.load.max"))
+        Op = AtomicRMWInst::Max;
+      else if (F->getName().startswith("llvm.atomic.load.min"))
+        Op = AtomicRMWInst::Min;
+      else if (F->getName().startswith("llvm.atomic.load.umax"))
+        Op = AtomicRMWInst::UMax;
+      else if (F->getName().startswith("llvm.atomic.load.umin"))
+        Op = AtomicRMWInst::UMin;
+      else
+        llvm_unreachable("Unknown atomic");
+
+      Value *Val = Builder.CreateAtomicRMW(Op, CI->getArgOperand(0),
+                                           CI->getArgOperand(1),
+                                           Monotonic);
+
+      // Replace intrinsic.
+      Val->takeName(CI);
+      if (!CI->use_empty())
+        CI->replaceAllUsesWith(Val);
+      CI->eraseFromParent();
+    } else if (F->getName() == "llvm.memory.barrier") {
+      IRBuilder<> Builder(C);
+      Builder.SetInsertPoint(CI->getParent(), CI);
+
+      // Note that this conversion ignores the "device" bit; it was not really
+      // well-defined, and got abused because nobody paid enough attention to
+      // get it right. In practice, this probably doesn't matter; application
+      // code generally doesn't need anything stronger than
+      // SequentiallyConsistent (and realistically, SequentiallyConsistent
+      // is lowered to a strong enough barrier for almost anything).
+
+      if (cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue())
+        Builder.CreateFence(SequentiallyConsistent);
+      else if (!cast<ConstantInt>(CI->getArgOperand(0))->getZExtValue())
+        Builder.CreateFence(Release);
+      else if (!cast<ConstantInt>(CI->getArgOperand(3))->getZExtValue())
+        Builder.CreateFence(Acquire);
+      else
+        Builder.CreateFence(AcquireRelease);
+
+      // Remove intrinsic.
+      CI->eraseFromParent();
     } else {
       llvm_unreachable("Unknown function for CallInst upgrade.");
     }
@@ -192,7 +307,7 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
   case Intrinsic::prefetch: {
     IRBuilder<> Builder(C);
     Builder.SetInsertPoint(CI->getParent(), CI);
-    const llvm::Type *I32Ty = llvm::Type::getInt32Ty(CI->getContext());
+    llvm::Type *I32Ty = llvm::Type::getInt32Ty(CI->getContext());
 
     // Add the extra "data cache" argument
     Value *Operands[4] = { CI->getArgOperand(0), CI->getArgOperand(1),
@@ -212,6 +327,32 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
     CI->eraseFromParent();
     break;
   }
+  case Intrinsic::init_trampoline: {
+
+    //  Transform
+    //    %tramp = call i8* llvm.init.trampoline (i8* x, i8* y, i8* z)
+    //  to
+    //    call void llvm.init.trampoline (i8* %x, i8* %y, i8* %z)
+    //    %tramp = call i8* llvm.adjust.trampoline (i8* %x)
+
+    Function *AdjustTrampolineFn =
+      cast<Function>(Intrinsic::getDeclaration(F->getParent(),
+                                               Intrinsic::adjust_trampoline));
+
+    IRBuilder<> Builder(C);
+    Builder.SetInsertPoint(CI);
+
+    Builder.CreateCall3(NewFn, CI->getArgOperand(0), CI->getArgOperand(1),
+                        CI->getArgOperand(2));
+
+    CallInst *AdjustCall = Builder.CreateCall(AdjustTrampolineFn,
+                                              CI->getArgOperand(0),
+                                              CI->getName());
+    if (!CI->use_empty())
+      CI->replaceAllUsesWith(AdjustCall);
+    CI->eraseFromParent();
+    break;
+  }
   }
 }
 
@@ -279,3 +420,249 @@ void llvm::CheckDebugInfoIntrinsics(Module *M) {
     }
   }
 }
+
+/// FindExnAndSelIntrinsics - Find the eh_exception and eh_selector intrinsic
+/// calls reachable from the unwind basic block.
+static void FindExnAndSelIntrinsics(BasicBlock *BB, CallInst *&Exn,
+                                    CallInst *&Sel,
+                                    SmallPtrSet<BasicBlock*, 8> &Visited) {
+  if (!Visited.insert(BB)) return;
+
+  for (BasicBlock::iterator
+         I = BB->begin(), E = BB->end(); I != E; ++I) {
+    if (CallInst *CI = dyn_cast<CallInst>(I)) {
+      switch (CI->getCalledFunction()->getIntrinsicID()) {
+      default: break;
+      case Intrinsic::eh_exception:
+        assert(!Exn && "Found more than one eh.exception call!");
+        Exn = CI;
+        break;
+      case Intrinsic::eh_selector:
+        assert(!Sel && "Found more than one eh.selector call!");
+        Sel = CI;
+        break;
+      }
+
+      if (Exn && Sel) return;
+    }
+  }
+
+  if (Exn && Sel) return;
+
+  for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I) {
+    FindExnAndSelIntrinsics(*I, Exn, Sel, Visited);
+    if (Exn && Sel) return;
+  }
+}
+
+/// TransferClausesToLandingPadInst - Transfer the exception handling clauses
+/// from the eh_selector call to the new landingpad instruction.
+static void TransferClausesToLandingPadInst(LandingPadInst *LPI,
+                                            CallInst *EHSel) {
+  LLVMContext &Context = LPI->getContext();
+  unsigned N = EHSel->getNumArgOperands();
+
+  for (unsigned i = N - 1; i > 1; --i) {
+    if (const ConstantInt *CI = dyn_cast<ConstantInt>(EHSel->getArgOperand(i))){
+      unsigned FilterLength = CI->getZExtValue();
+      unsigned FirstCatch = i + FilterLength + !FilterLength;
+      assert(FirstCatch <= N && "Invalid filter length");
+
+      if (FirstCatch < N)
+        for (unsigned j = FirstCatch; j < N; ++j) {
+          Value *Val = EHSel->getArgOperand(j);
+          if (!Val->hasName() || Val->getName() != "llvm.eh.catch.all.value") {
+            LPI->addClause(EHSel->getArgOperand(j));
+          } else {
+            GlobalVariable *GV = cast<GlobalVariable>(Val);
+            LPI->addClause(GV->getInitializer());
+          }
+        }
+
+      if (!FilterLength) {
+        // Cleanup.
+        LPI->setCleanup(true);
+      } else {
+        // Filter.
+        SmallVector<Constant *, 4> TyInfo;
+        TyInfo.reserve(FilterLength - 1);
+        for (unsigned j = i + 1; j < FirstCatch; ++j)
+          TyInfo.push_back(cast<Constant>(EHSel->getArgOperand(j)));
+        ArrayType *AType =
+          ArrayType::get(!TyInfo.empty() ? TyInfo[0]->getType() :
+                         PointerType::getUnqual(Type::getInt8Ty(Context)),
+                         TyInfo.size());
+        LPI->addClause(ConstantArray::get(AType, TyInfo));
+      }
+
+      N = i;
+    }
+  }
+
+  if (N > 2)
+    for (unsigned j = 2; j < N; ++j) {
+      Value *Val = EHSel->getArgOperand(j);
+      if (!Val->hasName() || Val->getName() != "llvm.eh.catch.all.value") {
+        LPI->addClause(EHSel->getArgOperand(j));
+      } else {
+        GlobalVariable *GV = cast<GlobalVariable>(Val);
+        LPI->addClause(GV->getInitializer());
+      }
+    }
+}
+
+/// This function upgrades the old pre-3.0 exception handling system to the new
+/// one. N.B. This will be removed in 3.1.
+void llvm::UpgradeExceptionHandling(Module *M) {
+  Function *EHException = M->getFunction("llvm.eh.exception");
+  Function *EHSelector = M->getFunction("llvm.eh.selector");
+  if (!EHException || !EHSelector)
+    return;
+
+  LLVMContext &Context = M->getContext();
+  Type *ExnTy = PointerType::getUnqual(Type::getInt8Ty(Context));
+  Type *SelTy = Type::getInt32Ty(Context);
+  Type *LPadSlotTy = StructType::get(ExnTy, SelTy, NULL);
+
+  // This map links the invoke instruction with the eh.exception and eh.selector
+  // calls associated with it.
+  DenseMap<InvokeInst*, std::pair<Value*, Value*> > InvokeToIntrinsicsMap;
+  for (Module::iterator
+         I = M->begin(), E = M->end(); I != E; ++I) {
+    Function &F = *I;
+
+    for (Function::iterator
+           II = F.begin(), IE = F.end(); II != IE; ++II) {
+      BasicBlock *BB = &*II;
+      InvokeInst *Inst = dyn_cast<InvokeInst>(BB->getTerminator());
+      if (!Inst) continue;
+      BasicBlock *UnwindDest = Inst->getUnwindDest();
+      if (UnwindDest->isLandingPad()) continue; // Already converted.
+
+      SmallPtrSet<BasicBlock*, 8> Visited;
+      CallInst *Exn = 0;
+      CallInst *Sel = 0;
+      FindExnAndSelIntrinsics(UnwindDest, Exn, Sel, Visited);
+      assert(Exn && Sel && "Cannot find eh.exception and eh.selector calls!");
+      InvokeToIntrinsicsMap[Inst] = std::make_pair(Exn, Sel);
+    }
+  }
+
+  // This map stores the slots where the exception object and selector value are
+  // stored within a function.
+  DenseMap<Function*, std::pair<Value*, Value*> > FnToLPadSlotMap;
+  SmallPtrSet<Instruction*, 32> DeadInsts;
+  for (DenseMap<InvokeInst*, std::pair<Value*, Value*> >::iterator
+         I = InvokeToIntrinsicsMap.begin(), E = InvokeToIntrinsicsMap.end();
+       I != E; ++I) {
+    InvokeInst *Invoke = I->first;
+    BasicBlock *UnwindDest = Invoke->getUnwindDest();
+    Function *F = UnwindDest->getParent();
+    std::pair<Value*, Value*> EHIntrinsics = I->second;
+    CallInst *Exn = cast<CallInst>(EHIntrinsics.first);
+    CallInst *Sel = cast<CallInst>(EHIntrinsics.second);
+
+    // Store the exception object and selector value in the entry block.
+    Value *ExnSlot = 0;
+    Value *SelSlot = 0;
+    if (!FnToLPadSlotMap[F].first) {
+      BasicBlock *Entry = &F->front();
+      ExnSlot = new AllocaInst(ExnTy, "exn", Entry->getTerminator());
+      SelSlot = new AllocaInst(SelTy, "sel", Entry->getTerminator());
+      FnToLPadSlotMap[F] = std::make_pair(ExnSlot, SelSlot);
+    } else {
+      ExnSlot = FnToLPadSlotMap[F].first;
+      SelSlot = FnToLPadSlotMap[F].second;
+    }
+
+    if (!UnwindDest->getSinglePredecessor()) {
+      // The unwind destination doesn't have a single predecessor. Create an
+      // unwind destination which has only one predecessor.
+      BasicBlock *NewBB = BasicBlock::Create(Context, "new.lpad",
+                                             UnwindDest->getParent());
+      BranchInst::Create(UnwindDest, NewBB);
+      Invoke->setUnwindDest(NewBB);
+
+      // Fix up any PHIs in the original unwind destination block.
+      for (BasicBlock::iterator
+             II = UnwindDest->begin(); isa<PHINode>(II); ++II) {
+        PHINode *PN = cast<PHINode>(II);
+        int Idx = PN->getBasicBlockIndex(Invoke->getParent());
+        if (Idx == -1) continue;
+        PN->setIncomingBlock(Idx, NewBB);
+      }
+
+      UnwindDest = NewBB;
+    }
+
+    IRBuilder<> Builder(Context);
+    Builder.SetInsertPoint(UnwindDest, UnwindDest->getFirstInsertionPt());
+
+    Value *PersFn = Sel->getArgOperand(1);
+    LandingPadInst *LPI = Builder.CreateLandingPad(LPadSlotTy, PersFn, 0);
+    Value *LPExn = Builder.CreateExtractValue(LPI, 0);
+    Value *LPSel = Builder.CreateExtractValue(LPI, 1);
+    Builder.CreateStore(LPExn, ExnSlot);
+    Builder.CreateStore(LPSel, SelSlot);
+
+    TransferClausesToLandingPadInst(LPI, Sel);
+
+    DeadInsts.insert(Exn);
+    DeadInsts.insert(Sel);
+  }
+
+  // Replace the old intrinsic calls with the values from the landingpad
+  // instruction(s). These values were stored in allocas for us to use here.
+  for (DenseMap<InvokeInst*, std::pair<Value*, Value*> >::iterator
+         I = InvokeToIntrinsicsMap.begin(), E = InvokeToIntrinsicsMap.end();
+       I != E; ++I) {
+    std::pair<Value*, Value*> EHIntrinsics = I->second;
+    CallInst *Exn = cast<CallInst>(EHIntrinsics.first);
+    CallInst *Sel = cast<CallInst>(EHIntrinsics.second);
+    BasicBlock *Parent = Exn->getParent();
+
+    std::pair<Value*,Value*> ExnSelSlots = FnToLPadSlotMap[Parent->getParent()];
+
+    IRBuilder<> Builder(Context);
+    Builder.SetInsertPoint(Parent, Exn);
+    LoadInst *LPExn = Builder.CreateLoad(ExnSelSlots.first, "exn.load");
+    LoadInst *LPSel = Builder.CreateLoad(ExnSelSlots.second, "sel.load");
+
+    Exn->replaceAllUsesWith(LPExn);
+    Sel->replaceAllUsesWith(LPSel);
+  }
+
+  // Remove the dead instructions.
+  for (SmallPtrSet<Instruction*, 32>::iterator
+         I = DeadInsts.begin(), E = DeadInsts.end(); I != E; ++I) {
+    Instruction *Inst = *I;
+    Inst->eraseFromParent();
+  }
+
+  // Replace calls to "llvm.eh.resume" with the 'resume' instruction. Load the
+  // exception and selector values from the stored place.
+  Function *EHResume = M->getFunction("llvm.eh.resume");
+  if (!EHResume) return;
+
+  while (!EHResume->use_empty()) {
+    CallInst *Resume = cast<CallInst>(EHResume->use_back());
+    BasicBlock *BB = Resume->getParent();
+
+    IRBuilder<> Builder(Context);
+    Builder.SetInsertPoint(BB, Resume);
+
+    Value *LPadVal =
+      Builder.CreateInsertValue(UndefValue::get(LPadSlotTy),
+                                Resume->getArgOperand(0), 0, "lpad.val");
+    LPadVal = Builder.CreateInsertValue(LPadVal, Resume->getArgOperand(1),
+                                        1, "lpad.val");
+    Builder.CreateResume(LPadVal);
+
+    // Remove all instructions after the 'resume.'
+    BasicBlock::iterator I = Resume;
+    while (I != BB->end()) {
+      Instruction *Inst = &*I++;
+      Inst->eraseFromParent();
+    }
+  }
+}