[CodeGen] Use range-based for loops (NFC)

clang/lib/CodeGen/CGBlocks.cpp

@@ -1415,10 +1415,10 @@ llvm::Function *CodeGenFunction::GenerateBlockFunction(
   // Arrange for local static and local extern declarations to appear
   // to be local to this function as well, in case they're directly
   // referenced in a block.
-  for (DeclMapTy::const_iterator i = ldm.begin(), e = ldm.end(); i != e; ++i) {
-    const auto *var = dyn_cast<VarDecl>(i->first);
+  for (const auto &KV : ldm) {
+    const auto *var = dyn_cast<VarDecl>(KV.first);
     if (var && !var->hasLocalStorage())
-      setAddrOfLocalVar(var, i->second);
+      setAddrOfLocalVar(var, KV.second);
   }
 
   // Begin building the function declaration.

clang/lib/CodeGen/CGCleanup.cpp

@@ -962,8 +962,8 @@ void CodeGenFunction::PopCleanupBlock(bool FallthroughIsBranchThrough,
 
       // Append the prepared cleanup prologue from above.
       llvm::BasicBlock *NormalExit = Builder.GetInsertBlock();
-      for (unsigned I = 0, E = InstsToAppend.size(); I != E; ++I)
-        InstsToAppend[I]->insertInto(NormalExit, NormalExit->end());
+      for (llvm::Instruction *Inst : InstsToAppend)
+        Inst->insertInto(NormalExit, NormalExit->end());
 
       // Optimistically hope that any fixups will continue falling through.
       for (unsigned I = FixupDepth, E = EHStack.getNumBranchFixups();

clang/lib/CodeGen/CGDeclCXX.cpp

@@ -1121,9 +1121,9 @@ CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
       EmitObjCAutoreleasePoolCleanup(token);
     }
 
-    for (unsigned i = 0, e = Decls.size(); i != e; ++i)
-      if (Decls[i])
-        EmitRuntimeCall(Decls[i]);
+    for (llvm::Function *Decl : Decls)
+      if (Decl)
+        EmitRuntimeCall(Decl);
 
     Scope.ForceCleanup();
 

clang/lib/CodeGen/CGException.cpp

@@ -319,9 +319,9 @@ static bool PersonalityHasOnlyCXXUses(llvm::Constant *Fn) {
     llvm::Function *F = dyn_cast<llvm::Function>(U);
     if (!F) return false;
 
-    for (auto BB = F->begin(), E = F->end(); BB != E; ++BB) {
-      if (BB->isLandingPad())
-        if (!LandingPadHasOnlyCXXUses(BB->getLandingPadInst()))
+    for (llvm::BasicBlock &BB : *F) {
+      if (BB.isLandingPad())
+        if (!LandingPadHasOnlyCXXUses(BB.getLandingPadInst()))
           return false;
     }
   }
@@ -937,8 +937,8 @@ llvm::BasicBlock *CodeGenFunction::EmitLandingPad() {
                              filterTypes[0]->getType() : Int8PtrTy,
                            filterTypes.size());
 
-    for (unsigned i = 0, e = filterTypes.size(); i != e; ++i)
-      Filters.push_back(cast<llvm::Constant>(filterTypes[i]));
+    for (llvm::Value *filterType : filterTypes)
+      Filters.push_back(cast<llvm::Constant>(filterType));
     llvm::Constant *FilterArray = llvm::ConstantArray::get(AType, Filters);
     LPadInst->addClause(FilterArray);
 

clang/lib/CodeGen/CGExpr.cpp

@@ -3801,8 +3801,8 @@ void CodeGenFunction::EmitCheck(
       ArgTypes.push_back(Args.back()->getType());
     }
 
-    for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
-      Args.push_back(EmitCheckValue(DynamicArgs[i]));
+    for (llvm::Value *DynamicArg : DynamicArgs) {
+      Args.push_back(EmitCheckValue(DynamicArg));
       ArgTypes.push_back(IntPtrTy);
     }
   }
@@ -4932,8 +4932,8 @@ EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
   llvm::Constant *BaseElts = Base.getExtVectorElts();
   SmallVector<llvm::Constant *, 4> CElts;
 
-  for (unsigned i = 0, e = Indices.size(); i != e; ++i)
-    CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
+  for (unsigned Index : Indices)
+    CElts.push_back(BaseElts->getAggregateElement(Index));
   llvm::Constant *CV = llvm::ConstantVector::get(CElts);
   return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
                                   Base.getBaseInfo(), TBAAAccessInfo());
@@ -6660,8 +6660,8 @@ static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
   }
 
   // Unbind all the opaques now.
-  for (unsigned i = 0, e = opaques.size(); i != e; ++i)
-    opaques[i].unbind(CGF);
+  for (CodeGenFunction::OpaqueValueMappingData &opaque : opaques)
+    opaque.unbind(CGF);
 
   return result;
 }

clang/lib/CodeGen/CGExprConstant.cpp

@@ -871,9 +871,7 @@ bool ConstStructBuilder::Build(const APValue &Val, const RecordDecl *RD,
     }
     llvm::stable_sort(Bases);
 
-    for (unsigned I = 0, N = Bases.size(); I != N; ++I) {
-      BaseInfo &Base = Bases[I];
-
+    for (const BaseInfo &Base : Bases) {
       bool IsPrimaryBase = Layout.getPrimaryBase() == Base.Decl;
       Build(Val.getStructBase(Base.Index), Base.Decl, IsPrimaryBase,
             VTableClass, Offset + Base.Offset);

clang/lib/CodeGen/CGObjC.cpp

@@ -3173,8 +3173,8 @@ ARCExprEmitter<Impl,Result>::visitPseudoObjectExpr(const PseudoObjectExpr *E) {
   }
 
   // Unbind all the opaques now.
-  for (unsigned i = 0, e = opaques.size(); i != e; ++i)
-    opaques[i].unbind(CGF);
+  for (CodeGenFunction::OpaqueValueMappingData &opaque : opaques)
+    opaque.unbind(CGF);
 
   return result;
 }

clang/lib/CodeGen/CGObjCGNU.cpp

@@ -1103,8 +1103,7 @@ class CGObjCGNUstep2 : public CGObjCGNUstep {
     bool isNamed = !isNonASCII;
     if (isNamed) {
       StringName = ".objc_str_";
-      for (int i=0,e=Str.size() ; i<e ; ++i) {
-        unsigned char c = Str[i];
+      for (unsigned char c : Str) {
         if (isalnum(c))
           StringName += c;
         else if (c == ' ')
@@ -2560,10 +2559,9 @@ llvm::Value *CGObjCGNU::GetTypedSelector(CodeGenFunction &CGF, Selector Sel,
   SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel];
   llvm::GlobalAlias *SelValue = nullptr;
 
-  for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
-      e = Types.end() ; i!=e ; i++) {
-    if (i->first == TypeEncoding) {
-      SelValue = i->second;
+  for (const TypedSelector &Type : Types) {
+    if (Type.first == TypeEncoding) {
+      SelValue = Type.second;
       break;
     }
   }
@@ -3333,13 +3331,12 @@ CGObjCGNU::GenerateProtocolList(ArrayRef<std::string> Protocols) {
   ProtocolList.addInt(LongTy, Protocols.size());
 
   auto Elements = ProtocolList.beginArray(PtrToInt8Ty);
-  for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
-      iter != endIter ; iter++) {
+  for (const std::string &Protocol : Protocols) {
     llvm::Constant *protocol = nullptr;
-    llvm::StringMap<llvm::Constant*>::iterator value =
-      ExistingProtocols.find(*iter);
+    llvm::StringMap<llvm::Constant *>::iterator value =
+        ExistingProtocols.find(Protocol);
     if (value == ExistingProtocols.end()) {
-      protocol = GenerateEmptyProtocol(*iter);
+      protocol = GenerateEmptyProtocol(Protocol);
     } else {
       protocol = value->getValue();
     }

clang/lib/CodeGen/CGObjCMac.cpp

@@ -2702,8 +2702,8 @@ llvm::Constant *CGObjCCommonMac::getBitmapBlockLayout(bool ComputeByrefLayout) {
   unsigned char inst = (BLOCK_LAYOUT_OPERATOR << 4) | 0;
   Layout.push_back(inst);
   std::string BitMap;
-  for (unsigned i = 0, e = Layout.size(); i != e; i++)
-    BitMap += Layout[i];
+  for (unsigned char C : Layout)
+    BitMap += C;
 
   if (CGM.getLangOpts().ObjCGCBitmapPrint) {
     if (ComputeByrefLayout)
@@ -4225,9 +4225,8 @@ FragileHazards::FragileHazards(CodeGenFunction &CGF) : CGF(CGF) {
     return;
 
   // Collect all the blocks in the function.
-  for (llvm::Function::iterator I = CGF.CurFn->begin(), E = CGF.CurFn->end();
-       I != E; ++I)
-    BlocksBeforeTry.insert(&*I);
+  for (llvm::BasicBlock &BB : *CGF.CurFn)
+    BlocksBeforeTry.insert(&BB);
 
   llvm::FunctionType *AsmFnTy = GetAsmFnType();
 
@@ -4299,9 +4298,7 @@ void FragileHazards::emitHazardsInNewBlocks() {
   CGBuilderTy Builder(CGF, CGF.getLLVMContext());
 
   // Iterate through all blocks, skipping those prior to the try.
-  for (llvm::Function::iterator FI = CGF.CurFn->begin(), FE = CGF.CurFn->end();
-       FI != FE; ++FI) {
-    llvm::BasicBlock &BB = *FI;
+  for (llvm::BasicBlock &BB : *CGF.CurFn) {
     if (BlocksBeforeTry.count(&BB))
       continue;
 
@@ -4348,10 +4345,9 @@ void FragileHazards::collectLocals() {
   // Collect all the allocas currently in the function.  This is
   // probably way too aggressive.
   llvm::BasicBlock &Entry = CGF.CurFn->getEntryBlock();
-  for (llvm::BasicBlock::iterator I = Entry.begin(), E = Entry.end(); I != E;
-       ++I)
-    if (isa<llvm::AllocaInst>(*I) && !AllocasToIgnore.count(&*I))
-      Locals.push_back(&*I);
+  for (llvm::Instruction &I : Entry)
+    if (isa<llvm::AllocaInst>(I) && !AllocasToIgnore.count(&I))
+      Locals.push_back(&I);
 }
 
 llvm::FunctionType *FragileHazards::GetAsmFnType() {

clang/lib/CodeGen/CGObjCRuntime.cpp

@@ -220,9 +220,7 @@ void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
   CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
 
   // Emit the handlers.
-  for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
-    CatchHandler &Handler = Handlers[I];
-
+  for (CatchHandler &Handler : Handlers) {
     CGF.EmitBlock(Handler.Block);
 
     CodeGenFunction::LexicalScope Cleanups(CGF, Handler.Body->getSourceRange());