Delete trailing whitespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62307 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 64 insertions, 64 deletions

diff --git a/lib/CodeGen/ShadowStackGC.cpp b/lib/CodeGen/ShadowStackGC.cpp
index 0576228bd2..472bd374d9 100644
--- a/lib/CodeGen/ShadowStackGC.cpp
+++ b/lib/CodeGen/ShadowStackGC.cpp
@@ -36,26 +36,26 @@
 using namespace llvm;
 
 namespace {
-  
+
   class VISIBILITY_HIDDEN ShadowStackGC : public GCStrategy {
     /// RootChain - This is the global linked-list that contains the chain of GC
     /// roots.
     GlobalVariable *Head;
-    
+
     /// StackEntryTy - Abstract type of a link in the shadow stack.
-    /// 
+    ///
     const StructType *StackEntryTy;
-    
+
     /// Roots - GC roots in the current function. Each is a pair of the
     /// intrinsic call and its corresponding alloca.
     std::vector<std::pair<CallInst*,AllocaInst*> > Roots;
-    
+
   public:
     ShadowStackGC();
-    
+
     bool initializeCustomLowering(Module &M);
     bool performCustomLowering(Function &F);
-    
+
   private:
     bool IsNullValue(Value *V);
     Constant *GetFrameMap(Function &F);
@@ -68,58 +68,58 @@ namespace {
   };
 
 }
-  
+
 static GCRegistry::Add<ShadowStackGC>
 X("shadow-stack", "Very portable GC for uncooperative code generators");
-  
+
 namespace {
   /// EscapeEnumerator - This is a little algorithm to find all escape points
   /// from a function so that "finally"-style code can be inserted. In addition
   /// to finding the existing return and unwind instructions, it also (if
   /// necessary) transforms any call instructions into invokes and sends them to
   /// a landing pad.
-  /// 
+  ///
   /// It's wrapped up in a state machine using the same transform C# uses for
   /// 'yield return' enumerators, This transform allows it to be non-allocating.
   class VISIBILITY_HIDDEN EscapeEnumerator {
     Function &F;
     const char *CleanupBBName;
-    
+
     // State.
     int State;
     Function::iterator StateBB, StateE;
     IRBuilder<> Builder;
-    
+
   public:
     EscapeEnumerator(Function &F, const char *N = "cleanup")
       : F(F), CleanupBBName(N), State(0) {}
-    
+
     IRBuilder<> *Next() {
       switch (State) {
       default:
         return 0;
-        
+
       case 0:
         StateBB = F.begin();
         StateE = F.end();
         State = 1;
-        
+
       case 1:
         // Find all 'return' and 'unwind' instructions.
         while (StateBB != StateE) {
           BasicBlock *CurBB = StateBB++;
-          
+
           // Branches and invokes do not escape, only unwind and return do.
           TerminatorInst *TI = CurBB->getTerminator();
           if (!isa<UnwindInst>(TI) && !isa<ReturnInst>(TI))
             continue;
-          
+
           Builder.SetInsertPoint(TI->getParent(), TI);
           return &Builder;
         }
-        
+
         State = 2;
-        
+
         // Find all 'call' instructions.
         SmallVector<Instruction*,16> Calls;
         for (Function::iterator BB = F.begin(),
@@ -130,33 +130,33 @@ namespace {
               if (!CI->getCalledFunction() ||
                   !CI->getCalledFunction()->getIntrinsicID())
                 Calls.push_back(CI);
-        
+
         if (Calls.empty())
           return 0;
-        
+
         // Create a cleanup block.
         BasicBlock *CleanupBB = BasicBlock::Create(CleanupBBName, &F);
         UnwindInst *UI = new UnwindInst(CleanupBB);
-        
+
         // Transform the 'call' instructions into 'invoke's branching to the
         // cleanup block. Go in reverse order to make prettier BB names.
         SmallVector<Value*,16> Args;
         for (unsigned I = Calls.size(); I != 0; ) {
           CallInst *CI = cast<CallInst>(Calls[--I]);
-          
+
           // Split the basic block containing the function call.
           BasicBlock *CallBB = CI->getParent();
           BasicBlock *NewBB =
             CallBB->splitBasicBlock(CI, CallBB->getName() + ".cont");
-          
+
           // Remove the unconditional branch inserted at the end of CallBB.
           CallBB->getInstList().pop_back();
           NewBB->getInstList().remove(CI);
-          
+
           // Create a new invoke instruction.
           Args.clear();
           Args.append(CI->op_begin() + 1, CI->op_end());
-          
+
           InvokeInst *II = InvokeInst::Create(CI->getOperand(0),
                                               NewBB, CleanupBB,
                                               Args.begin(), Args.end(),
@@ -166,7 +166,7 @@ namespace {
           CI->replaceAllUsesWith(II);
           delete CI;
         }
-        
+
         Builder.SetInsertPoint(UI->getParent(), UI);
         return &Builder;
       }
@@ -185,9 +185,9 @@ ShadowStackGC::ShadowStackGC() : Head(0), StackEntryTy(0) {
 
 Constant *ShadowStackGC::GetFrameMap(Function &F) {
   // doInitialization creates the abstract type of this value.
-  
+
   Type *VoidPtr = PointerType::getUnqual(Type::Int8Ty);
-  
+
   // Truncate the ShadowStackDescriptor if some metadata is null.
   unsigned NumMeta = 0;
   SmallVector<Constant*,16> Metadata;
@@ -197,33 +197,33 @@ Constant *ShadowStackGC::GetFrameMap(Function &F) {
       NumMeta = I + 1;
     Metadata.push_back(ConstantExpr::getBitCast(C, VoidPtr));
   }
-  
+
   Constant *BaseElts[] = {
     ConstantInt::get(Type::Int32Ty, Roots.size(), false),
     ConstantInt::get(Type::Int32Ty, NumMeta, false),
   };
-  
+
   Constant *DescriptorElts[] = {
     ConstantStruct::get(BaseElts, 2),
     ConstantArray::get(ArrayType::get(VoidPtr, NumMeta),
                        Metadata.begin(), NumMeta)
   };
-  
+
   Constant *FrameMap = ConstantStruct::get(DescriptorElts, 2);
-  
+
   std::string TypeName("gc_map.");
   TypeName += utostr(NumMeta);
   F.getParent()->addTypeName(TypeName, FrameMap->getType());
-  
+
   // FIXME: Is this actually dangerous as WritingAnLLVMPass.html claims? Seems
   //        that, short of multithreaded LLVM, it should be safe; all that is
   //        necessary is that a simple Module::iterator loop not be invalidated.
   //        Appending to the GlobalVariable list is safe in that sense.
-  // 
+  //
   //        All of the output passes emit globals last. The ExecutionEngine
   //        explicitly supports adding globals to the module after
   //        initialization.
-  // 
+  //
   //        Still, if it isn't deemed acceptable, then this transformation needs
   //        to be a ModulePass (which means it cannot be in the 'llc' pipeline
   //        (which uses a FunctionPassManager (which segfaults (not asserts) if
@@ -232,7 +232,7 @@ Constant *ShadowStackGC::GetFrameMap(Function &F) {
                                     GlobalVariable::InternalLinkage,
                                     FrameMap, "__gc_" + F.getName(),
                                     F.getParent());
-  
+
   Constant *GEPIndices[2] = { ConstantInt::get(Type::Int32Ty, 0),
                               ConstantInt::get(Type::Int32Ty, 0) };
   return ConstantExpr::getGetElementPtr(GV, GEPIndices, 2);
@@ -245,11 +245,11 @@ const Type* ShadowStackGC::GetConcreteStackEntryType(Function &F) {
   for (size_t I = 0; I != Roots.size(); I++)
     EltTys.push_back(Roots[I].second->getAllocatedType());
   Type *Ty = StructType::get(EltTys);
-  
+
   std::string TypeName("gc_stackentry.");
   TypeName += F.getName();
   F.getParent()->addTypeName(TypeName, Ty);
-  
+
   return Ty;
 }
 
@@ -267,25 +267,25 @@ bool ShadowStackGC::initializeCustomLowering(Module &M) {
   StructType *FrameMapTy = StructType::get(EltTys);
   M.addTypeName("gc_map", FrameMapTy);
   PointerType *FrameMapPtrTy = PointerType::getUnqual(FrameMapTy);
-  
+
   // struct StackEntry {
   //   ShadowStackEntry *Next; // Caller's stack entry.
   //   FrameMap *Map;          // Pointer to constant FrameMap.
   //   void *Roots[];          // Stack roots (in-place array, so we pretend).
   // };
   OpaqueType *RecursiveTy = OpaqueType::get();
-  
+
   EltTys.clear();
   EltTys.push_back(PointerType::getUnqual(RecursiveTy));
   EltTys.push_back(FrameMapPtrTy);
   PATypeHolder LinkTyH = StructType::get(EltTys);
-  
+
   RecursiveTy->refineAbstractTypeTo(LinkTyH.get());
   StackEntryTy = cast<StructType>(LinkTyH.get());
   const PointerType *StackEntryPtrTy = PointerType::getUnqual(StackEntryTy);
   M.addTypeName("gc_stackentry", LinkTyH.get());  // FIXME: Is this safe from
                                                   //        a FunctionPass?
-  
+
   // Get the root chain if it already exists.
   Head = M.getGlobalVariable("llvm_gc_root_chain");
   if (!Head) {
@@ -299,7 +299,7 @@ bool ShadowStackGC::initializeCustomLowering(Module &M) {
     Head->setInitializer(Constant::getNullValue(StackEntryPtrTy));
     Head->setLinkage(GlobalValue::LinkOnceLinkage);
   }
-  
+
   return true;
 }
 
@@ -313,11 +313,11 @@ void ShadowStackGC::CollectRoots(Function &F) {
   // FIXME: Account for original alignment. Could fragment the root array.
   //   Approach 1: Null initialize empty slots at runtime. Yuck.
   //   Approach 2: Emit a map of the array instead of just a count.
-  
+
   assert(Roots.empty() && "Not cleaned up?");
-  
+
   SmallVector<std::pair<CallInst*,AllocaInst*>,16> MetaRoots;
-  
+
   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++))
@@ -330,7 +330,7 @@ void ShadowStackGC::CollectRoots(Function &F) {
             else
               MetaRoots.push_back(Pair);
           }
-  
+
   // Number roots with metadata (usually empty) at the beginning, so that the
   // FrameMap::Meta array can be elided.
   Roots.insert(Roots.begin(), MetaRoots.begin(), MetaRoots.end());
@@ -343,9 +343,9 @@ ShadowStackGC::CreateGEP(IRBuilder<> &B, Value *BasePtr,
                        ConstantInt::get(Type::Int32Ty, Idx),
                        ConstantInt::get(Type::Int32Ty, Idx2) };
   Value* Val = B.CreateGEP(BasePtr, Indices, Indices + 3, Name);
-    
+
   assert(isa<GetElementPtrInst>(Val) && "Unexpected folded constant");
-    
+
   return dyn_cast<GetElementPtrInst>(Val);
 }
 
@@ -355,7 +355,7 @@ ShadowStackGC::CreateGEP(IRBuilder<> &B, Value *BasePtr,
   Value *Indices[] = { ConstantInt::get(Type::Int32Ty, 0),
                        ConstantInt::get(Type::Int32Ty, Idx) };
   Value *Val = B.CreateGEP(BasePtr, Indices, Indices + 2, Name);
-    
+
   assert(isa<GetElementPtrInst>(Val) && "Unexpected folded constant");
 
   return dyn_cast<GetElementPtrInst>(Val);
@@ -365,55 +365,55 @@ ShadowStackGC::CreateGEP(IRBuilder<> &B, Value *BasePtr,
 bool ShadowStackGC::performCustomLowering(Function &F) {
   // Find calls to llvm.gcroot.
   CollectRoots(F);
-  
+
   // If there are no roots in this function, then there is no need to add a
   // stack map entry for it.
   if (Roots.empty())
     return false;
-  
+
   // Build the constant map and figure the type of the shadow stack entry.
   Value *FrameMap = GetFrameMap(F);
   const Type *ConcreteStackEntryTy = GetConcreteStackEntryType(F);
-  
+
   // Build the shadow stack entry at the very start of the function.
   BasicBlock::iterator IP = F.getEntryBlock().begin();
   IRBuilder<> AtEntry(IP->getParent(), IP);
-  
+
   Instruction *StackEntry   = AtEntry.CreateAlloca(ConcreteStackEntryTy, 0,
                                                    "gc_frame");
-  
+
   while (isa<AllocaInst>(IP)) ++IP;
   AtEntry.SetInsertPoint(IP->getParent(), IP);
-  
+
   // Initialize the map pointer and load the current head of the shadow stack.
   Instruction *CurrentHead  = AtEntry.CreateLoad(Head, "gc_currhead");
   Instruction *EntryMapPtr  = CreateGEP(AtEntry, StackEntry,0,1,"gc_frame.map");
                               AtEntry.CreateStore(FrameMap, EntryMapPtr);
-  
+
   // After all the allocas...
   for (unsigned I = 0, E = Roots.size(); I != E; ++I) {
     // For each root, find the corresponding slot in the aggregate...
     Value *SlotPtr = CreateGEP(AtEntry, StackEntry, 1 + I, "gc_root");
-    
+
     // And use it in lieu of the alloca.
     AllocaInst *OriginalAlloca = Roots[I].second;
     SlotPtr->takeName(OriginalAlloca);
     OriginalAlloca->replaceAllUsesWith(SlotPtr);
   }
-  
+
   // Move past the original stores inserted by GCStrategy::InitRoots. This isn't
   // really necessary (the collector would never see the intermediate state at
   // runtime), but it's nicer not to push the half-initialized entry onto the
   // shadow stack.
   while (isa<StoreInst>(IP)) ++IP;
   AtEntry.SetInsertPoint(IP->getParent(), IP);
-  
+
   // Push the entry onto the shadow stack.
   Instruction *EntryNextPtr = CreateGEP(AtEntry,StackEntry,0,0,"gc_frame.next");
   Instruction *NewHeadVal   = CreateGEP(AtEntry,StackEntry, 0, "gc_newhead");
                               AtEntry.CreateStore(CurrentHead, EntryNextPtr);
                               AtEntry.CreateStore(NewHeadVal, Head);
-  
+
   // For each instruction that escapes...
   EscapeEnumerator EE(F, "gc_cleanup");
   while (IRBuilder<> *AtExit = EE.Next()) {
@@ -424,7 +424,7 @@ bool ShadowStackGC::performCustomLowering(Function &F) {
     Value *SavedHead = AtExit->CreateLoad(EntryNextPtr2, "gc_savedhead");
                        AtExit->CreateStore(SavedHead, Head);
   }
-  
+
   // Delete the original allocas (which are no longer used) and the intrinsic
   // calls (which are no longer valid). Doing this last avoids invalidating
   // iterators.
@@ -432,7 +432,7 @@ bool ShadowStackGC::performCustomLowering(Function &F) {
     Roots[I].first->eraseFromParent();
     Roots[I].second->eraseFromParent();
   }
-  
+
   Roots.clear();
   return true;
 }