1 files changed, 0 insertions, 2114 deletions

diff --git a/contrib/llvm/tools/clang/lib/CodeGen/CGException.cpp b/contrib/llvm/tools/clang/lib/CodeGen/CGException.cpp
deleted file mode 100644
index 3b7a88a0b769..000000000000
--- a/contrib/llvm/tools/clang/lib/CodeGen/CGException.cpp
+++ /dev/null
@@ -1,2114 +0,0 @@
-//===--- CGException.cpp - Emit LLVM Code for C++ exceptions ----*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This contains code dealing with C++ exception related code generation.
-//
-//===----------------------------------------------------------------------===//
-
-#include "CodeGenFunction.h"
-#include "CGCXXABI.h"
-#include "CGCleanup.h"
-#include "CGObjCRuntime.h"
-#include "ConstantEmitter.h"
-#include "TargetInfo.h"
-#include "clang/AST/Mangle.h"
-#include "clang/AST/StmtCXX.h"
-#include "clang/AST/StmtObjC.h"
-#include "clang/AST/StmtVisitor.h"
-#include "clang/Basic/TargetBuiltins.h"
-#include "llvm/IR/Intrinsics.h"
-#include "llvm/IR/IntrinsicInst.h"
-#include "llvm/Support/SaveAndRestore.h"
-
-using namespace clang;
-using namespace CodeGen;
-
-static llvm::FunctionCallee getFreeExceptionFn(CodeGenModule &CGM) {
-  // void __cxa_free_exception(void *thrown_exception);
-
-  llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
-
-  return CGM.CreateRuntimeFunction(FTy, "__cxa_free_exception");
-}
-
-static llvm::FunctionCallee getUnexpectedFn(CodeGenModule &CGM) {
-  // void __cxa_call_unexpected(void *thrown_exception);
-
-  llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
-
-  return CGM.CreateRuntimeFunction(FTy, "__cxa_call_unexpected");
-}
-
-llvm::FunctionCallee CodeGenModule::getTerminateFn() {
-  // void __terminate();
-
-  llvm::FunctionType *FTy =
-    llvm::FunctionType::get(VoidTy, /*isVarArg=*/false);
-
-  StringRef name;
-
-  // In C++, use std::terminate().
-  if (getLangOpts().CPlusPlus &&
-      getTarget().getCXXABI().isItaniumFamily()) {
-    name = "_ZSt9terminatev";
-  } else if (getLangOpts().CPlusPlus &&
-             getTarget().getCXXABI().isMicrosoft()) {
-    if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
-      name = "__std_terminate";
-    else
-      name = "?terminate@@YAXXZ";
-  } else if (getLangOpts().ObjC &&
-             getLangOpts().ObjCRuntime.hasTerminate())
-    name = "objc_terminate";
-  else
-    name = "abort";
-  return CreateRuntimeFunction(FTy, name);
-}
-
-static llvm::FunctionCallee getCatchallRethrowFn(CodeGenModule &CGM,
-                                                 StringRef Name) {
-  llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
-
-  return CGM.CreateRuntimeFunction(FTy, Name);
-}
-
-const EHPersonality EHPersonality::GNU_C = { "__gcc_personality_v0", nullptr };
-const EHPersonality
-EHPersonality::GNU_C_SJLJ = { "__gcc_personality_sj0", nullptr };
-const EHPersonality
-EHPersonality::GNU_C_SEH = { "__gcc_personality_seh0", nullptr };
-const EHPersonality
-EHPersonality::NeXT_ObjC = { "__objc_personality_v0", nullptr };
-const EHPersonality
-EHPersonality::GNU_CPlusPlus = { "__gxx_personality_v0", nullptr };
-const EHPersonality
-EHPersonality::GNU_CPlusPlus_SJLJ = { "__gxx_personality_sj0", nullptr };
-const EHPersonality
-EHPersonality::GNU_CPlusPlus_SEH = { "__gxx_personality_seh0", nullptr };
-const EHPersonality
-EHPersonality::GNU_ObjC = {"__gnu_objc_personality_v0", "objc_exception_throw"};
-const EHPersonality
-EHPersonality::GNU_ObjC_SJLJ = {"__gnu_objc_personality_sj0", "objc_exception_throw"};
-const EHPersonality
-EHPersonality::GNU_ObjC_SEH = {"__gnu_objc_personality_seh0", "objc_exception_throw"};
-const EHPersonality
-EHPersonality::GNU_ObjCXX = { "__gnustep_objcxx_personality_v0", nullptr };
-const EHPersonality
-EHPersonality::GNUstep_ObjC = { "__gnustep_objc_personality_v0", nullptr };
-const EHPersonality
-EHPersonality::MSVC_except_handler = { "_except_handler3", nullptr };
-const EHPersonality
-EHPersonality::MSVC_C_specific_handler = { "__C_specific_handler", nullptr };
-const EHPersonality
-EHPersonality::MSVC_CxxFrameHandler3 = { "__CxxFrameHandler3", nullptr };
-const EHPersonality
-EHPersonality::GNU_Wasm_CPlusPlus = { "__gxx_wasm_personality_v0", nullptr };
-
-static const EHPersonality &getCPersonality(const TargetInfo &Target,
-                                            const LangOptions &L) {
-  const llvm::Triple &T = Target.getTriple();
-  if (T.isWindowsMSVCEnvironment())
-    return EHPersonality::MSVC_CxxFrameHandler3;
-  if (L.SjLjExceptions)
-    return EHPersonality::GNU_C_SJLJ;
-  if (L.DWARFExceptions)
-    return EHPersonality::GNU_C;
-  if (L.SEHExceptions)
-    return EHPersonality::GNU_C_SEH;
-  return EHPersonality::GNU_C;
-}
-
-static const EHPersonality &getObjCPersonality(const TargetInfo &Target,
-                                               const LangOptions &L) {
-  const llvm::Triple &T = Target.getTriple();
-  if (T.isWindowsMSVCEnvironment())
-    return EHPersonality::MSVC_CxxFrameHandler3;
-
-  switch (L.ObjCRuntime.getKind()) {
-  case ObjCRuntime::FragileMacOSX:
-    return getCPersonality(Target, L);
-  case ObjCRuntime::MacOSX:
-  case ObjCRuntime::iOS:
-  case ObjCRuntime::WatchOS:
-    return EHPersonality::NeXT_ObjC;
-  case ObjCRuntime::GNUstep:
-    if (L.ObjCRuntime.getVersion() >= VersionTuple(1, 7))
-      return EHPersonality::GNUstep_ObjC;
-    LLVM_FALLTHROUGH;
-  case ObjCRuntime::GCC:
-  case ObjCRuntime::ObjFW:
-    if (L.SjLjExceptions)
-      return EHPersonality::GNU_ObjC_SJLJ;
-    if (L.SEHExceptions)
-      return EHPersonality::GNU_ObjC_SEH;
-    return EHPersonality::GNU_ObjC;
-  }
-  llvm_unreachable("bad runtime kind");
-}
-
-static const EHPersonality &getCXXPersonality(const TargetInfo &Target,
-                                              const LangOptions &L) {
-  const llvm::Triple &T = Target.getTriple();
-  if (T.isWindowsMSVCEnvironment())
-    return EHPersonality::MSVC_CxxFrameHandler3;
-  if (L.SjLjExceptions)
-    return EHPersonality::GNU_CPlusPlus_SJLJ;
-  if (L.DWARFExceptions)
-    return EHPersonality::GNU_CPlusPlus;
-  if (L.SEHExceptions)
-    return EHPersonality::GNU_CPlusPlus_SEH;
-  // Wasm EH is a non-MVP feature for now.
-  if (Target.hasFeature("exception-handling") &&
-      (T.getArch() == llvm::Triple::wasm32 ||
-       T.getArch() == llvm::Triple::wasm64))
-    return EHPersonality::GNU_Wasm_CPlusPlus;
-  return EHPersonality::GNU_CPlusPlus;
-}
-
-/// Determines the personality function to use when both C++
-/// and Objective-C exceptions are being caught.
-static const EHPersonality &getObjCXXPersonality(const TargetInfo &Target,
-                                                 const LangOptions &L) {
-  if (Target.getTriple().isWindowsMSVCEnvironment())
-    return EHPersonality::MSVC_CxxFrameHandler3;
-
-  switch (L.ObjCRuntime.getKind()) {
-  // In the fragile ABI, just use C++ exception handling and hope
-  // they're not doing crazy exception mixing.
-  case ObjCRuntime::FragileMacOSX:
-    return getCXXPersonality(Target, L);
-
-  // The ObjC personality defers to the C++ personality for non-ObjC
-  // handlers.  Unlike the C++ case, we use the same personality
-  // function on targets using (backend-driven) SJLJ EH.
-  case ObjCRuntime::MacOSX:
-  case ObjCRuntime::iOS:
-  case ObjCRuntime::WatchOS:
-    return getObjCPersonality(Target, L);
-
-  case ObjCRuntime::GNUstep:
-    return EHPersonality::GNU_ObjCXX;
-
-  // The GCC runtime's personality function inherently doesn't support
-  // mixed EH.  Use the ObjC personality just to avoid returning null.
-  case ObjCRuntime::GCC:
-  case ObjCRuntime::ObjFW:
-    return getObjCPersonality(Target, L);
-  }
-  llvm_unreachable("bad runtime kind");
-}
-
-static const EHPersonality &getSEHPersonalityMSVC(const llvm::Triple &T) {
-  if (T.getArch() == llvm::Triple::x86)
-    return EHPersonality::MSVC_except_handler;
-  return EHPersonality::MSVC_C_specific_handler;
-}
-
-const EHPersonality &EHPersonality::get(CodeGenModule &CGM,
-                                        const FunctionDecl *FD) {
-  const llvm::Triple &T = CGM.getTarget().getTriple();
-  const LangOptions &L = CGM.getLangOpts();
-  const TargetInfo &Target = CGM.getTarget();
-
-  // Functions using SEH get an SEH personality.
-  if (FD && FD->usesSEHTry())
-    return getSEHPersonalityMSVC(T);
-
-  if (L.ObjC)
-    return L.CPlusPlus ? getObjCXXPersonality(Target, L)
-                       : getObjCPersonality(Target, L);
-  return L.CPlusPlus ? getCXXPersonality(Target, L)
-                     : getCPersonality(Target, L);
-}
-
-const EHPersonality &EHPersonality::get(CodeGenFunction &CGF) {
-  const auto *FD = CGF.CurCodeDecl;
-  // For outlined finallys and filters, use the SEH personality in case they
-  // contain more SEH. This mostly only affects finallys. Filters could
-  // hypothetically use gnu statement expressions to sneak in nested SEH.
-  FD = FD ? FD : CGF.CurSEHParent;
-  return get(CGF.CGM, dyn_cast_or_null<FunctionDecl>(FD));
-}
-
-static llvm::FunctionCallee getPersonalityFn(CodeGenModule &CGM,
-                                             const EHPersonality &Personality) {
-  return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.Int32Ty, true),
-                                   Personality.PersonalityFn,
-                                   llvm::AttributeList(), /*Local=*/true);
-}
-
-static llvm::Constant *getOpaquePersonalityFn(CodeGenModule &CGM,
-                                        const EHPersonality &Personality) {
-  llvm::FunctionCallee Fn = getPersonalityFn(CGM, Personality);
-  llvm::PointerType* Int8PtrTy = llvm::PointerType::get(
-      llvm::Type::getInt8Ty(CGM.getLLVMContext()),
-      CGM.getDataLayout().getProgramAddressSpace());
-
-  return llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(Fn.getCallee()),
-                                        Int8PtrTy);
-}
-
-/// Check whether a landingpad instruction only uses C++ features.
-static bool LandingPadHasOnlyCXXUses(llvm::LandingPadInst *LPI) {
-  for (unsigned I = 0, E = LPI->getNumClauses(); I != E; ++I) {
-    // Look for something that would've been returned by the ObjC
-    // runtime's GetEHType() method.
-    llvm::Value *Val = LPI->getClause(I)->stripPointerCasts();
-    if (LPI->isCatch(I)) {
-      // Check if the catch value has the ObjC prefix.
-      if (llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Val))
-        // ObjC EH selector entries are always global variables with
-        // names starting like this.
-        if (GV->getName().startswith("OBJC_EHTYPE"))
-          return false;
-    } else {
-      // Check if any of the filter values have the ObjC prefix.
-      llvm::Constant *CVal = cast<llvm::Constant>(Val);
-      for (llvm::User::op_iterator
-              II = CVal->op_begin(), IE = CVal->op_end(); II != IE; ++II) {
-        if (llvm::GlobalVariable *GV =
-            cast<llvm::GlobalVariable>((*II)->stripPointerCasts()))
-          // ObjC EH selector entries are always global variables with
-          // names starting like this.
-          if (GV->getName().startswith("OBJC_EHTYPE"))
-            return false;
-      }
-    }
-  }
-  return true;
-}
-
-/// Check whether a personality function could reasonably be swapped
-/// for a C++ personality function.
-static bool PersonalityHasOnlyCXXUses(llvm::Constant *Fn) {
-  for (llvm::User *U : Fn->users()) {
-    // Conditionally white-list bitcasts.
-    if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(U)) {
-      if (CE->getOpcode() != llvm::Instruction::BitCast) return false;
-      if (!PersonalityHasOnlyCXXUses(CE))
-        return false;
-      continue;
-    }
-
-    // Otherwise it must be a function.
-    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()))
-          return false;
-    }
-  }
-
-  return true;
-}
-
-/// Try to use the C++ personality function in ObjC++.  Not doing this
-/// can cause some incompatibilities with gcc, which is more
-/// aggressive about only using the ObjC++ personality in a function
-/// when it really needs it.
-void CodeGenModule::SimplifyPersonality() {
-  // If we're not in ObjC++ -fexceptions, there's nothing to do.
-  if (!LangOpts.CPlusPlus || !LangOpts.ObjC || !LangOpts.Exceptions)
-    return;
-
-  // Both the problem this endeavors to fix and the way the logic
-  // above works is specific to the NeXT runtime.
-  if (!LangOpts.ObjCRuntime.isNeXTFamily())
-    return;
-
-  const EHPersonality &ObjCXX = EHPersonality::get(*this, /*FD=*/nullptr);
-  const EHPersonality &CXX = getCXXPersonality(getTarget(), LangOpts);
-  if (&ObjCXX == &CXX)
-    return;
-
-  assert(std::strcmp(ObjCXX.PersonalityFn, CXX.PersonalityFn) != 0 &&
-         "Different EHPersonalities using the same personality function.");
-
-  llvm::Function *Fn = getModule().getFunction(ObjCXX.PersonalityFn);
-
-  // Nothing to do if it's unused.
-  if (!Fn || Fn->use_empty()) return;
-
-  // Can't do the optimization if it has non-C++ uses.
-  if (!PersonalityHasOnlyCXXUses(Fn)) return;
-
-  // Create the C++ personality function and kill off the old
-  // function.
-  llvm::FunctionCallee CXXFn = getPersonalityFn(*this, CXX);
-
-  // This can happen if the user is screwing with us.
-  if (Fn->getType() != CXXFn.getCallee()->getType())
-    return;
-
-  Fn->replaceAllUsesWith(CXXFn.getCallee());
-  Fn->eraseFromParent();
-}
-
-/// Returns the value to inject into a selector to indicate the
-/// presence of a catch-all.
-static llvm::Constant *getCatchAllValue(CodeGenFunction &CGF) {
-  // Possibly we should use @llvm.eh.catch.all.value here.
-  return llvm::ConstantPointerNull::get(CGF.Int8PtrTy);
-}
-
-namespace {
-  /// A cleanup to free the exception object if its initialization
-  /// throws.
-  struct FreeException final : EHScopeStack::Cleanup {
-    llvm::Value *exn;
-    FreeException(llvm::Value *exn) : exn(exn) {}
-    void Emit(CodeGenFunction &CGF, Flags flags) override {
-      CGF.EmitNounwindRuntimeCall(getFreeExceptionFn(CGF.CGM), exn);
-    }
-  };
-} // end anonymous namespace
-
-// Emits an exception expression into the given location.  This
-// differs from EmitAnyExprToMem only in that, if a final copy-ctor
-// call is required, an exception within that copy ctor causes
-// std::terminate to be invoked.
-void CodeGenFunction::EmitAnyExprToExn(const Expr *e, Address addr) {
-  // Make sure the exception object is cleaned up if there's an
-  // exception during initialization.
-  pushFullExprCleanup<FreeException>(EHCleanup, addr.getPointer());
-  EHScopeStack::stable_iterator cleanup = EHStack.stable_begin();
-
-  // __cxa_allocate_exception returns a void*;  we need to cast this
-  // to the appropriate type for the object.
-  llvm::Type *ty = ConvertTypeForMem(e->getType())->getPointerTo();
-  Address typedAddr = Builder.CreateBitCast(addr, ty);
-
-  // FIXME: this isn't quite right!  If there's a final unelided call
-  // to a copy constructor, then according to [except.terminate]p1 we
-  // must call std::terminate() if that constructor throws, because
-  // technically that copy occurs after the exception expression is
-  // evaluated but before the exception is caught.  But the best way
-  // to handle that is to teach EmitAggExpr to do the final copy
-  // differently if it can't be elided.
-  EmitAnyExprToMem(e, typedAddr, e->getType().getQualifiers(),
-                   /*IsInit*/ true);
-
-  // Deactivate the cleanup block.
-  DeactivateCleanupBlock(cleanup,
-                         cast<llvm::Instruction>(typedAddr.getPointer()));
-}
-
-Address CodeGenFunction::getExceptionSlot() {
-  if (!ExceptionSlot)
-    ExceptionSlot = CreateTempAlloca(Int8PtrTy, "exn.slot");
-  return Address(ExceptionSlot, getPointerAlign());
-}
-
-Address CodeGenFunction::getEHSelectorSlot() {
-  if (!EHSelectorSlot)
-    EHSelectorSlot = CreateTempAlloca(Int32Ty, "ehselector.slot");
-  return Address(EHSelectorSlot, CharUnits::fromQuantity(4));
-}
-
-llvm::Value *CodeGenFunction::getExceptionFromSlot() {
-  return Builder.CreateLoad(getExceptionSlot(), "exn");
-}
-
-llvm::Value *CodeGenFunction::getSelectorFromSlot() {
-  return Builder.CreateLoad(getEHSelectorSlot(), "sel");
-}
-
-void CodeGenFunction::EmitCXXThrowExpr(const CXXThrowExpr *E,
-                                       bool KeepInsertionPoint) {
-  if (const Expr *SubExpr = E->getSubExpr()) {
-    QualType ThrowType = SubExpr->getType();
-    if (ThrowType->isObjCObjectPointerType()) {
-      const Stmt *ThrowStmt = E->getSubExpr();
-      const ObjCAtThrowStmt S(E->getExprLoc(), const_cast<Stmt *>(ThrowStmt));
-      CGM.getObjCRuntime().EmitThrowStmt(*this, S, false);
-    } else {
-      CGM.getCXXABI().emitThrow(*this, E);
-    }
-  } else {
-    CGM.getCXXABI().emitRethrow(*this, /*isNoReturn=*/true);
-  }
-
-  // throw is an expression, and the expression emitters expect us
-  // to leave ourselves at a valid insertion point.
-  if (KeepInsertionPoint)
-    EmitBlock(createBasicBlock("throw.cont"));
-}
-
-void CodeGenFunction::EmitStartEHSpec(const Decl *D) {
-  if (!CGM.getLangOpts().CXXExceptions)
-    return;
-
-  const FunctionDecl* FD = dyn_cast_or_null<FunctionDecl>(D);
-  if (!FD) {
-    // Check if CapturedDecl is nothrow and create terminate scope for it.
-    if (const CapturedDecl* CD = dyn_cast_or_null<CapturedDecl>(D)) {
-      if (CD->isNothrow())
-        EHStack.pushTerminate();
-    }
-    return;
-  }
-  const FunctionProtoType *Proto = FD->getType()->getAs<FunctionProtoType>();
-  if (!Proto)
-    return;
-
-  ExceptionSpecificationType EST = Proto->getExceptionSpecType();
-  if (isNoexceptExceptionSpec(EST) && Proto->canThrow() == CT_Cannot) {
-    // noexcept functions are simple terminate scopes.
-    EHStack.pushTerminate();
-  } else if (EST == EST_Dynamic || EST == EST_DynamicNone) {
-    // TODO: Revisit exception specifications for the MS ABI.  There is a way to
-    // encode these in an object file but MSVC doesn't do anything with it.
-    if (getTarget().getCXXABI().isMicrosoft())
-      return;
-    unsigned NumExceptions = Proto->getNumExceptions();
-    EHFilterScope *Filter = EHStack.pushFilter(NumExceptions);
-
-    for (unsigned I = 0; I != NumExceptions; ++I) {
-      QualType Ty = Proto->getExceptionType(I);
-      QualType ExceptType = Ty.getNonReferenceType().getUnqualifiedType();
-      llvm::Value *EHType = CGM.GetAddrOfRTTIDescriptor(ExceptType,
-                                                        /*ForEH=*/true);
-      Filter->setFilter(I, EHType);
-    }
-  }
-}
-
-/// Emit the dispatch block for a filter scope if necessary.
-static void emitFilterDispatchBlock(CodeGenFunction &CGF,
-                                    EHFilterScope &filterScope) {
-  llvm::BasicBlock *dispatchBlock = filterScope.getCachedEHDispatchBlock();
-  if (!dispatchBlock) return;
-  if (dispatchBlock->use_empty()) {
-    delete dispatchBlock;
-    return;
-  }
-
-  CGF.EmitBlockAfterUses(dispatchBlock);
-
-  // If this isn't a catch-all filter, we need to check whether we got
-  // here because the filter triggered.
-  if (filterScope.getNumFilters()) {
-    // Load the selector value.
-    llvm::Value *selector = CGF.getSelectorFromSlot();
-    llvm::BasicBlock *unexpectedBB = CGF.createBasicBlock("ehspec.unexpected");
-
-    llvm::Value *zero = CGF.Builder.getInt32(0);
-    llvm::Value *failsFilter =
-        CGF.Builder.CreateICmpSLT(selector, zero, "ehspec.fails");
-    CGF.Builder.CreateCondBr(failsFilter, unexpectedBB,
-                             CGF.getEHResumeBlock(false));
-
-    CGF.EmitBlock(unexpectedBB);
-  }
-
-  // Call __cxa_call_unexpected.  This doesn't need to be an invoke
-  // because __cxa_call_unexpected magically filters exceptions
-  // according to the last landing pad the exception was thrown
-  // into.  Seriously.
-  llvm::Value *exn = CGF.getExceptionFromSlot();
-  CGF.EmitRuntimeCall(getUnexpectedFn(CGF.CGM), exn)
-    ->setDoesNotReturn();
-  CGF.Builder.CreateUnreachable();
-}
-
-void CodeGenFunction::EmitEndEHSpec(const Decl *D) {
-  if (!CGM.getLangOpts().CXXExceptions)
-    return;
-
-  const FunctionDecl* FD = dyn_cast_or_null<FunctionDecl>(D);
-  if (!FD) {
-    // Check if CapturedDecl is nothrow and pop terminate scope for it.
-    if (const CapturedDecl* CD = dyn_cast_or_null<CapturedDecl>(D)) {
-      if (CD->isNothrow())
-        EHStack.popTerminate();
-    }
-    return;
-  }
-  const FunctionProtoType *Proto = FD->getType()->getAs<FunctionProtoType>();
-  if (!Proto)
-    return;
-
-  ExceptionSpecificationType EST = Proto->getExceptionSpecType();
-  if (isNoexceptExceptionSpec(EST) && Proto->canThrow() == CT_Cannot) {
-    EHStack.popTerminate();
-  } else if (EST == EST_Dynamic || EST == EST_DynamicNone) {
-    // TODO: Revisit exception specifications for the MS ABI.  There is a way to
-    // encode these in an object file but MSVC doesn't do anything with it.
-    if (getTarget().getCXXABI().isMicrosoft())
-      return;
-    EHFilterScope &filterScope = cast<EHFilterScope>(*EHStack.begin());
-    emitFilterDispatchBlock(*this, filterScope);
-    EHStack.popFilter();
-  }
-}
-
-void CodeGenFunction::EmitCXXTryStmt(const CXXTryStmt &S) {
-  EnterCXXTryStmt(S);
-  EmitStmt(S.getTryBlock());
-  ExitCXXTryStmt(S);
-}
-
-void CodeGenFunction::EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock) {
-  unsigned NumHandlers = S.getNumHandlers();
-  EHCatchScope *CatchScope = EHStack.pushCatch(NumHandlers);
-
-  for (unsigned I = 0; I != NumHandlers; ++I) {
-    const CXXCatchStmt *C = S.getHandler(I);
-
-    llvm::BasicBlock *Handler = createBasicBlock("catch");
-    if (C->getExceptionDecl()) {
-      // FIXME: Dropping the reference type on the type into makes it
-      // impossible to correctly implement catch-by-reference
-      // semantics for pointers.  Unfortunately, this is what all
-      // existing compilers do, and it's not clear that the standard
-      // personality routine is capable of doing this right.  See C++ DR 388:
-      //   http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#388
-      Qualifiers CaughtTypeQuals;
-      QualType CaughtType = CGM.getContext().getUnqualifiedArrayType(
-          C->getCaughtType().getNonReferenceType(), CaughtTypeQuals);
-
-      CatchTypeInfo TypeInfo{nullptr, 0};
-      if (CaughtType->isObjCObjectPointerType())
-        TypeInfo.RTTI = CGM.getObjCRuntime().GetEHType(CaughtType);
-      else
-        TypeInfo = CGM.getCXXABI().getAddrOfCXXCatchHandlerType(
-            CaughtType, C->getCaughtType());
-      CatchScope->setHandler(I, TypeInfo, Handler);
-    } else {
-      // No exception decl indicates '...', a catch-all.
-      CatchScope->setHandler(I, CGM.getCXXABI().getCatchAllTypeInfo(), Handler);
-    }
-  }
-}
-
-llvm::BasicBlock *
-CodeGenFunction::getEHDispatchBlock(EHScopeStack::stable_iterator si) {
-  if (EHPersonality::get(*this).usesFuncletPads())
-    return getFuncletEHDispatchBlock(si);
-
-  // The dispatch block for the end of the scope chain is a block that
-  // just resumes unwinding.
-  if (si == EHStack.stable_end())
-    return getEHResumeBlock(true);
-
-  // Otherwise, we should look at the actual scope.
-  EHScope &scope = *EHStack.find(si);
-
-  llvm::BasicBlock *dispatchBlock = scope.getCachedEHDispatchBlock();
-  if (!dispatchBlock) {
-    switch (scope.getKind()) {
-    case EHScope::Catch: {
-      // Apply a special case to a single catch-all.
-      EHCatchScope &catchScope = cast<EHCatchScope>(scope);
-      if (catchScope.getNumHandlers() == 1 &&
-          catchScope.getHandler(0).isCatchAll()) {
-        dispatchBlock = catchScope.getHandler(0).Block;
-
-      // Otherwise, make a dispatch block.
-      } else {
-        dispatchBlock = createBasicBlock("catch.dispatch");
-      }
-      break;
-    }
-
-    case EHScope::Cleanup:
-      dispatchBlock = createBasicBlock("ehcleanup");
-      break;
-
-    case EHScope::Filter:
-      dispatchBlock = createBasicBlock("filter.dispatch");
-      break;
-
-    case EHScope::Terminate:
-      dispatchBlock = getTerminateHandler();
-      break;
-
-    case EHScope::PadEnd:
-      llvm_unreachable("PadEnd unnecessary for Itanium!");
-    }
-    scope.setCachedEHDispatchBlock(dispatchBlock);
-  }
-  return dispatchBlock;
-}
-
-llvm::BasicBlock *
-CodeGenFunction::getFuncletEHDispatchBlock(EHScopeStack::stable_iterator SI) {
-  // Returning nullptr indicates that the previous dispatch block should unwind
-  // to caller.
-  if (SI == EHStack.stable_end())
-    return nullptr;
-
-  // Otherwise, we should look at the actual scope.
-  EHScope &EHS = *EHStack.find(SI);
-
-  llvm::BasicBlock *DispatchBlock = EHS.getCachedEHDispatchBlock();
-  if (DispatchBlock)
-    return DispatchBlock;
-
-  if (EHS.getKind() == EHScope::Terminate)
-    DispatchBlock = getTerminateFunclet();
-  else
-    DispatchBlock = createBasicBlock();
-  CGBuilderTy Builder(*this, DispatchBlock);
-
-  switch (EHS.getKind()) {
-  case EHScope::Catch:
-    DispatchBlock->setName("catch.dispatch");
-    break;
-
-  case EHScope::Cleanup:
-    DispatchBlock->setName("ehcleanup");
-    break;
-
-  case EHScope::Filter:
-    llvm_unreachable("exception specifications not handled yet!");
-
-  case EHScope::Terminate:
-    DispatchBlock->setName("terminate");
-    break;
-
-  case EHScope::PadEnd:
-    llvm_unreachable("PadEnd dispatch block missing!");
-  }
-  EHS.setCachedEHDispatchBlock(DispatchBlock);
-  return DispatchBlock;
-}
-
-/// Check whether this is a non-EH scope, i.e. a scope which doesn't
-/// affect exception handling.  Currently, the only non-EH scopes are
-/// normal-only cleanup scopes.
-static bool isNonEHScope(const EHScope &S) {
-  switch (S.getKind()) {
-  case EHScope::Cleanup:
-    return !cast<EHCleanupScope>(S).isEHCleanup();
-  case EHScope::Filter:
-  case EHScope::Catch:
-  case EHScope::Terminate:
-  case EHScope::PadEnd:
-    return false;
-  }
-
-  llvm_unreachable("Invalid EHScope Kind!");
-}
-
-llvm::BasicBlock *CodeGenFunction::getInvokeDestImpl() {
-  assert(EHStack.requiresLandingPad());
-  assert(!EHStack.empty());
-
-  // If exceptions are disabled and SEH is not in use, then there is no invoke
-  // destination. SEH "works" even if exceptions are off. In practice, this
-  // means that C++ destructors and other EH cleanups don't run, which is
-  // consistent with MSVC's behavior.
-  const LangOptions &LO = CGM.getLangOpts();
-  if (!LO.Exceptions) {
-    if (!LO.Borland && !LO.MicrosoftExt)
-      return nullptr;
-    if (!currentFunctionUsesSEHTry())
-      return nullptr;
-  }
-
-  // CUDA device code doesn't have exceptions.
-  if (LO.CUDA && LO.CUDAIsDevice)
-    return nullptr;
-
-  // Check the innermost scope for a cached landing pad.  If this is
-  // a non-EH cleanup, we'll check enclosing scopes in EmitLandingPad.
-  llvm::BasicBlock *LP = EHStack.begin()->getCachedLandingPad();
-  if (LP) return LP;
-
-  const EHPersonality &Personality = EHPersonality::get(*this);
-
-  if (!CurFn->hasPersonalityFn())
-    CurFn->setPersonalityFn(getOpaquePersonalityFn(CGM, Personality));
-
-  if (Personality.usesFuncletPads()) {
-    // We don't need separate landing pads in the funclet model.
-    LP = getEHDispatchBlock(EHStack.getInnermostEHScope());
-  } else {
-    // Build the landing pad for this scope.
-    LP = EmitLandingPad();
-  }
-
-  assert(LP);
-
-  // Cache the landing pad on the innermost scope.  If this is a
-  // non-EH scope, cache the landing pad on the enclosing scope, too.
-  for (EHScopeStack::iterator ir = EHStack.begin(); true; ++ir) {
-    ir->setCachedLandingPad(LP);
-    if (!isNonEHScope(*ir)) break;
-  }
-
-  return LP;
-}
-
-llvm::BasicBlock *CodeGenFunction::EmitLandingPad() {
-  assert(EHStack.requiresLandingPad());
-
-  EHScope &innermostEHScope = *EHStack.find(EHStack.getInnermostEHScope());
-  switch (innermostEHScope.getKind()) {
-  case EHScope::Terminate:
-    return getTerminateLandingPad();
-
-  case EHScope::PadEnd:
-    llvm_unreachable("PadEnd unnecessary for Itanium!");
-
-  case EHScope::Catch:
-  case EHScope::Cleanup:
-  case EHScope::Filter:
-    if (llvm::BasicBlock *lpad = innermostEHScope.getCachedLandingPad())
-      return lpad;
-  }
-
-  // Save the current IR generation state.
-  CGBuilderTy::InsertPoint savedIP = Builder.saveAndClearIP();
-  auto DL = ApplyDebugLocation::CreateDefaultArtificial(*this, CurEHLocation);
-
-  // Create and configure the landing pad.
-  llvm::BasicBlock *lpad = createBasicBlock("lpad");
-  EmitBlock(lpad);
-
-  llvm::LandingPadInst *LPadInst =
-      Builder.CreateLandingPad(llvm::StructType::get(Int8PtrTy, Int32Ty), 0);
-
-  llvm::Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
-  Builder.CreateStore(LPadExn, getExceptionSlot());
-  llvm::Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
-  Builder.CreateStore(LPadSel, getEHSelectorSlot());
-
-  // Save the exception pointer.  It's safe to use a single exception
-  // pointer per function because EH cleanups can never have nested
-  // try/catches.
-  // Build the landingpad instruction.
-
-  // Accumulate all the handlers in scope.
-  bool hasCatchAll = false;
-  bool hasCleanup = false;
-  bool hasFilter = false;
-  SmallVector<llvm::Value*, 4> filterTypes;
-  llvm::SmallPtrSet<llvm::Value*, 4> catchTypes;
-  for (EHScopeStack::iterator I = EHStack.begin(), E = EHStack.end(); I != E;
-       ++I) {
-
-    switch (I->getKind()) {
-    case EHScope::Cleanup:
-      // If we have a cleanup, remember that.
-      hasCleanup = (hasCleanup || cast<EHCleanupScope>(*I).isEHCleanup());
-      continue;
-
-    case EHScope::Filter: {
-      assert(I.next() == EHStack.end() && "EH filter is not end of EH stack");
-      assert(!hasCatchAll && "EH filter reached after catch-all");
-
-      // Filter scopes get added to the landingpad in weird ways.
-      EHFilterScope &filter = cast<EHFilterScope>(*I);
-      hasFilter = true;
-
-      // Add all the filter values.
-      for (unsigned i = 0, e = filter.getNumFilters(); i != e; ++i)
-        filterTypes.push_back(filter.getFilter(i));
-      goto done;
-    }
-
-    case EHScope::Terminate:
-      // Terminate scopes are basically catch-alls.
-      assert(!hasCatchAll);
-      hasCatchAll = true;
-      goto done;
-
-    case EHScope::Catch:
-      break;
-
-    case EHScope::PadEnd:
-      llvm_unreachable("PadEnd unnecessary for Itanium!");
-    }
-
-    EHCatchScope &catchScope = cast<EHCatchScope>(*I);
-    for (unsigned hi = 0, he = catchScope.getNumHandlers(); hi != he; ++hi) {
-      EHCatchScope::Handler handler = catchScope.getHandler(hi);
-      assert(handler.Type.Flags == 0 &&
-             "landingpads do not support catch handler flags");
-
-      // If this is a catch-all, register that and abort.
-      if (!handler.Type.RTTI) {
-        assert(!hasCatchAll);
-        hasCatchAll = true;
-        goto done;
-      }
-
-      // Check whether we already have a handler for this type.
-      if (catchTypes.insert(handler.Type.RTTI).second)
-        // If not, add it directly to the landingpad.
-        LPadInst->addClause(handler.Type.RTTI);
-    }
-  }
-
- done:
-  // If we have a catch-all, add null to the landingpad.
-  assert(!(hasCatchAll && hasFilter));
-  if (hasCatchAll) {
-    LPadInst->addClause(getCatchAllValue(*this));
-
-  // If we have an EH filter, we need to add those handlers in the
-  // right place in the landingpad, which is to say, at the end.
-  } else if (hasFilter) {
-    // Create a filter expression: a constant array indicating which filter
-    // types there are. The personality routine only lands here if the filter
-    // doesn't match.
-    SmallVector<llvm::Constant*, 8> Filters;
-    llvm::ArrayType *AType =
-      llvm::ArrayType::get(!filterTypes.empty() ?
-                             filterTypes[0]->getType() : Int8PtrTy,
-                           filterTypes.size());
-
-    for (unsigned i = 0, e = filterTypes.size(); i != e; ++i)
-      Filters.push_back(cast<llvm::Constant>(filterTypes[i]));
-    llvm::Constant *FilterArray = llvm::ConstantArray::get(AType, Filters);
-    LPadInst->addClause(FilterArray);
-
-    // Also check whether we need a cleanup.
-    if (hasCleanup)
-      LPadInst->setCleanup(true);
-
-  // Otherwise, signal that we at least have cleanups.
-  } else if (hasCleanup) {
-    LPadInst->setCleanup(true);
-  }
-
-  assert((LPadInst->getNumClauses() > 0 || LPadInst->isCleanup()) &&
-         "landingpad instruction has no clauses!");
-
-  // Tell the backend how to generate the landing pad.
-  Builder.CreateBr(getEHDispatchBlock(EHStack.getInnermostEHScope()));
-
-  // Restore the old IR generation state.
-  Builder.restoreIP(savedIP);
-
-  return lpad;
-}
-
-static void emitCatchPadBlock(CodeGenFunction &CGF, EHCatchScope &CatchScope) {
-  llvm::BasicBlock *DispatchBlock = CatchScope.getCachedEHDispatchBlock();
-  assert(DispatchBlock);
-
-  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveIP();
-  CGF.EmitBlockAfterUses(DispatchBlock);
-
-  llvm::Value *ParentPad = CGF.CurrentFuncletPad;
-  if (!ParentPad)
-    ParentPad = llvm::ConstantTokenNone::get(CGF.getLLVMContext());
-  llvm::BasicBlock *UnwindBB =
-      CGF.getEHDispatchBlock(CatchScope.getEnclosingEHScope());
-
-  unsigned NumHandlers = CatchScope.getNumHandlers();
-  llvm::CatchSwitchInst *CatchSwitch =
-      CGF.Builder.CreateCatchSwitch(ParentPad, UnwindBB, NumHandlers);
-
-  // Test against each of the exception types we claim to catch.
-  for (unsigned I = 0; I < NumHandlers; ++I) {
-    const EHCatchScope::Handler &Handler = CatchScope.getHandler(I);
-
-    CatchTypeInfo TypeInfo = Handler.Type;
-    if (!TypeInfo.RTTI)
-      TypeInfo.RTTI = llvm::Constant::getNullValue(CGF.VoidPtrTy);
-
-    CGF.Builder.SetInsertPoint(Handler.Block);
-
-    if (EHPersonality::get(CGF).isMSVCXXPersonality()) {
-      CGF.Builder.CreateCatchPad(
-          CatchSwitch, {TypeInfo.RTTI, CGF.Builder.getInt32(TypeInfo.Flags),
-                        llvm::Constant::getNullValue(CGF.VoidPtrTy)});
-    } else {
-      CGF.Builder.CreateCatchPad(CatchSwitch, {TypeInfo.RTTI});
-    }
-
-    CatchSwitch->addHandler(Handler.Block);
-  }
-  CGF.Builder.restoreIP(SavedIP);
-}
-
-// Wasm uses Windows-style EH instructions, but it merges all catch clauses into
-// one big catchpad, within which we use Itanium's landingpad-style selector
-// comparison instructions.
-static void emitWasmCatchPadBlock(CodeGenFunction &CGF,
-                                  EHCatchScope &CatchScope) {
-  llvm::BasicBlock *DispatchBlock = CatchScope.getCachedEHDispatchBlock();
-  assert(DispatchBlock);
-
-  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveIP();
-  CGF.EmitBlockAfterUses(DispatchBlock);
-
-  llvm::Value *ParentPad = CGF.CurrentFuncletPad;
-  if (!ParentPad)
-    ParentPad = llvm::ConstantTokenNone::get(CGF.getLLVMContext());
-  llvm::BasicBlock *UnwindBB =
-      CGF.getEHDispatchBlock(CatchScope.getEnclosingEHScope());
-
-  unsigned NumHandlers = CatchScope.getNumHandlers();
-  llvm::CatchSwitchInst *CatchSwitch =
-      CGF.Builder.CreateCatchSwitch(ParentPad, UnwindBB, NumHandlers);
-
-  // We don't use a landingpad instruction, so generate intrinsic calls to
-  // provide exception and selector values.
-  llvm::BasicBlock *WasmCatchStartBlock = CGF.createBasicBlock("catch.start");
-  CatchSwitch->addHandler(WasmCatchStartBlock);
-  CGF.EmitBlockAfterUses(WasmCatchStartBlock);
-
-  // Create a catchpad instruction.
-  SmallVector<llvm::Value *, 4> CatchTypes;
-  for (unsigned I = 0, E = NumHandlers; I < E; ++I) {
-    const EHCatchScope::Handler &Handler = CatchScope.getHandler(I);
-    CatchTypeInfo TypeInfo = Handler.Type;
-    if (!TypeInfo.RTTI)
-      TypeInfo.RTTI = llvm::Constant::getNullValue(CGF.VoidPtrTy);
-    CatchTypes.push_back(TypeInfo.RTTI);
-  }
-  auto *CPI = CGF.Builder.CreateCatchPad(CatchSwitch, CatchTypes);
-
-  // Create calls to wasm.get.exception and wasm.get.ehselector intrinsics.
-  // Before they are lowered appropriately later, they provide values for the
-  // exception and selector.
-  llvm::Function *GetExnFn =
-      CGF.CGM.getIntrinsic(llvm::Intrinsic::wasm_get_exception);
-  llvm::Function *GetSelectorFn =
-      CGF.CGM.getIntrinsic(llvm::Intrinsic::wasm_get_ehselector);
-  llvm::CallInst *Exn = CGF.Builder.CreateCall(GetExnFn, CPI);
-  CGF.Builder.CreateStore(Exn, CGF.getExceptionSlot());
-  llvm::CallInst *Selector = CGF.Builder.CreateCall(GetSelectorFn, CPI);
-
-  llvm::Function *TypeIDFn = CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for);
-
-  // If there's only a single catch-all, branch directly to its handler.
-  if (CatchScope.getNumHandlers() == 1 &&
-      CatchScope.getHandler(0).isCatchAll()) {
-    CGF.Builder.CreateBr(CatchScope.getHandler(0).Block);
-    CGF.Builder.restoreIP(SavedIP);
-    return;
-  }
-
-  // Test against each of the exception types we claim to catch.
-  for (unsigned I = 0, E = NumHandlers;; ++I) {
-    assert(I < E && "ran off end of handlers!");
-    const EHCatchScope::Handler &Handler = CatchScope.getHandler(I);
-    CatchTypeInfo TypeInfo = Handler.Type;
-    if (!TypeInfo.RTTI)
-      TypeInfo.RTTI = llvm::Constant::getNullValue(CGF.VoidPtrTy);
-
-    // Figure out the next block.
-    llvm::BasicBlock *NextBlock;
-
-    bool EmitNextBlock = false, NextIsEnd = false;
-
-    // If this is the last handler, we're at the end, and the next block is a
-    // block that contains a call to the rethrow function, so we can unwind to
-    // the enclosing EH scope. The call itself will be generated later.
-    if (I + 1 == E) {
-      NextBlock = CGF.createBasicBlock("rethrow");
-      EmitNextBlock = true;
-      NextIsEnd = true;
-
-      // If the next handler is a catch-all, we're at the end, and the
-      // next block is that handler.
-    } else if (CatchScope.getHandler(I + 1).isCatchAll()) {
-      NextBlock = CatchScope.getHandler(I + 1).Block;
-      NextIsEnd = true;
-
-      // Otherwise, we're not at the end and we need a new block.
-    } else {
-      NextBlock = CGF.createBasicBlock("catch.fallthrough");
-      EmitNextBlock = true;
-    }
-
-    // Figure out the catch type's index in the LSDA's type table.
-    llvm::CallInst *TypeIndex = CGF.Builder.CreateCall(TypeIDFn, TypeInfo.RTTI);
-    TypeIndex->setDoesNotThrow();
-
-    llvm::Value *MatchesTypeIndex =
-        CGF.Builder.CreateICmpEQ(Selector, TypeIndex, "matches");
-    CGF.Builder.CreateCondBr(MatchesTypeIndex, Handler.Block, NextBlock);
-
-    if (EmitNextBlock)
-      CGF.EmitBlock(NextBlock);
-    if (NextIsEnd)
-      break;
-  }
-
-  CGF.Builder.restoreIP(SavedIP);
-}
-
-/// Emit the structure of the dispatch block for the given catch scope.
-/// It is an invariant that the dispatch block already exists.
-static void emitCatchDispatchBlock(CodeGenFunction &CGF,
-                                   EHCatchScope &catchScope) {
-  if (EHPersonality::get(CGF).isWasmPersonality())
-    return emitWasmCatchPadBlock(CGF, catchScope);
-  if (EHPersonality::get(CGF).usesFuncletPads())
-    return emitCatchPadBlock(CGF, catchScope);
-
-  llvm::BasicBlock *dispatchBlock = catchScope.getCachedEHDispatchBlock();
-  assert(dispatchBlock);
-
-  // If there's only a single catch-all, getEHDispatchBlock returned
-  // that catch-all as the dispatch block.
-  if (catchScope.getNumHandlers() == 1 &&
-      catchScope.getHandler(0).isCatchAll()) {
-    assert(dispatchBlock == catchScope.getHandler(0).Block);
-    return;
-  }
-
-  CGBuilderTy::InsertPoint savedIP = CGF.Builder.saveIP();
-  CGF.EmitBlockAfterUses(dispatchBlock);
-
-  // Select the right handler.
-  llvm::Function *llvm_eh_typeid_for =
-    CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for);
-
-  // Load the selector value.
-  llvm::Value *selector = CGF.getSelectorFromSlot();
-
-  // Test against each of the exception types we claim to catch.
-  for (unsigned i = 0, e = catchScope.getNumHandlers(); ; ++i) {
-    assert(i < e && "ran off end of handlers!");
-    const EHCatchScope::Handler &handler = catchScope.getHandler(i);
-
-    llvm::Value *typeValue = handler.Type.RTTI;
-    assert(handler.Type.Flags == 0 &&
-           "landingpads do not support catch handler flags");
-    assert(typeValue && "fell into catch-all case!");
-    typeValue = CGF.Builder.CreateBitCast(typeValue, CGF.Int8PtrTy);
-
-    // Figure out the next block.
-    bool nextIsEnd;
-    llvm::BasicBlock *nextBlock;
-
-    // If this is the last handler, we're at the end, and the next
-    // block is the block for the enclosing EH scope.
-    if (i + 1 == e) {
-      nextBlock = CGF.getEHDispatchBlock(catchScope.getEnclosingEHScope());
-      nextIsEnd = true;
-
-    // If the next handler is a catch-all, we're at the end, and the
-    // next block is that handler.
-    } else if (catchScope.getHandler(i+1).isCatchAll()) {
-      nextBlock = catchScope.getHandler(i+1).Block;
-      nextIsEnd = true;
-
-    // Otherwise, we're not at the end and we need a new block.
-    } else {
-      nextBlock = CGF.createBasicBlock("catch.fallthrough");
-      nextIsEnd = false;
-    }
-
-    // Figure out the catch type's index in the LSDA's type table.
-    llvm::CallInst *typeIndex =
-      CGF.Builder.CreateCall(llvm_eh_typeid_for, typeValue);
-    typeIndex->setDoesNotThrow();
-
-    llvm::Value *matchesTypeIndex =
-      CGF.Builder.CreateICmpEQ(selector, typeIndex, "matches");
-    CGF.Builder.CreateCondBr(matchesTypeIndex, handler.Block, nextBlock);
-
-    // If the next handler is a catch-all, we're completely done.
-    if (nextIsEnd) {
-      CGF.Builder.restoreIP(savedIP);
-      return;
-    }
-    // Otherwise we need to emit and continue at that block.
-    CGF.EmitBlock(nextBlock);
-  }
-}
-
-void CodeGenFunction::popCatchScope() {
-  EHCatchScope &catchScope = cast<EHCatchScope>(*EHStack.begin());
-  if (catchScope.hasEHBranches())
-    emitCatchDispatchBlock(*this, catchScope);
-  EHStack.popCatch();
-}
-
-void CodeGenFunction::ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock) {
-  unsigned NumHandlers = S.getNumHandlers();
-  EHCatchScope &CatchScope = cast<EHCatchScope>(*EHStack.begin());
-  assert(CatchScope.getNumHandlers() == NumHandlers);
-  llvm::BasicBlock *DispatchBlock = CatchScope.getCachedEHDispatchBlock();
-
-  // If the catch was not required, bail out now.
-  if (!CatchScope.hasEHBranches()) {
-    CatchScope.clearHandlerBlocks();
-    EHStack.popCatch();
-    return;
-  }
-
-  // Emit the structure of the EH dispatch for this catch.
-  emitCatchDispatchBlock(*this, CatchScope);
-
-  // Copy the handler blocks off before we pop the EH stack.  Emitting
-  // the handlers might scribble on this memory.
-  SmallVector<EHCatchScope::Handler, 8> Handlers(
-      CatchScope.begin(), CatchScope.begin() + NumHandlers);
-
-  EHStack.popCatch();
-
-  // The fall-through block.
-  llvm::BasicBlock *ContBB = createBasicBlock("try.cont");
-
-  // We just emitted the body of the try; jump to the continue block.
-  if (HaveInsertPoint())
-    Builder.CreateBr(ContBB);
-
-  // Determine if we need an implicit rethrow for all these catch handlers;
-  // see the comment below.
-  bool doImplicitRethrow = false;
-  if (IsFnTryBlock)
-    doImplicitRethrow = isa<CXXDestructorDecl>(CurCodeDecl) ||
-                        isa<CXXConstructorDecl>(CurCodeDecl);
-
-  // Wasm uses Windows-style EH instructions, but merges all catch clauses into
-  // one big catchpad. So we save the old funclet pad here before we traverse
-  // each catch handler.
-  SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(
-      CurrentFuncletPad);
-  llvm::BasicBlock *WasmCatchStartBlock = nullptr;
-  if (EHPersonality::get(*this).isWasmPersonality()) {
-    auto *CatchSwitch =
-        cast<llvm::CatchSwitchInst>(DispatchBlock->getFirstNonPHI());
-    WasmCatchStartBlock = CatchSwitch->hasUnwindDest()
-                              ? CatchSwitch->getSuccessor(1)
-                              : CatchSwitch->getSuccessor(0);
-    auto *CPI = cast<llvm::CatchPadInst>(WasmCatchStartBlock->getFirstNonPHI());
-    CurrentFuncletPad = CPI;
-  }
-
-  // Perversely, we emit the handlers backwards precisely because we
-  // want them to appear in source order.  In all of these cases, the
-  // catch block will have exactly one predecessor, which will be a
-  // particular block in the catch dispatch.  However, in the case of
-  // a catch-all, one of the dispatch blocks will branch to two
-  // different handlers, and EmitBlockAfterUses will cause the second
-  // handler to be moved before the first.
-  bool HasCatchAll = false;
-  for (unsigned I = NumHandlers; I != 0; --I) {
-    HasCatchAll |= Handlers[I - 1].isCatchAll();
-    llvm::BasicBlock *CatchBlock = Handlers[I-1].Block;
-    EmitBlockAfterUses(CatchBlock);
-
-    // Catch the exception if this isn't a catch-all.
-    const CXXCatchStmt *C = S.getHandler(I-1);
-
-    // Enter a cleanup scope, including the catch variable and the
-    // end-catch.
-    RunCleanupsScope CatchScope(*this);
-
-    // Initialize the catch variable and set up the cleanups.
-    SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(
-        CurrentFuncletPad);
-    CGM.getCXXABI().emitBeginCatch(*this, C);
-
-    // Emit the PGO counter increment.
-    incrementProfileCounter(C);
-
-    // Perform the body of the catch.
-    EmitStmt(C->getHandlerBlock());
-
-    // [except.handle]p11:
-    //   The currently handled exception is rethrown if control
-    //   reaches the end of a handler of the function-try-block of a
-    //   constructor or destructor.
-
-    // It is important that we only do this on fallthrough and not on
-    // return.  Note that it's illegal to put a return in a
-    // constructor function-try-block's catch handler (p14), so this
-    // really only applies to destructors.
-    if (doImplicitRethrow && HaveInsertPoint()) {
-      CGM.getCXXABI().emitRethrow(*this, /*isNoReturn*/false);
-      Builder.CreateUnreachable();
-      Builder.ClearInsertionPoint();
-    }
-
-    // Fall out through the catch cleanups.
-    CatchScope.ForceCleanup();
-
-    // Branch out of the try.
-    if (HaveInsertPoint())
-      Builder.CreateBr(ContBB);
-  }
-
-  // Because in wasm we merge all catch clauses into one big catchpad, in case
-  // none of the types in catch handlers matches after we test against each of
-  // them, we should unwind to the next EH enclosing scope. We generate a call
-  // to rethrow function here to do that.
-  if (EHPersonality::get(*this).isWasmPersonality() && !HasCatchAll) {
-    assert(WasmCatchStartBlock);
-    // Navigate for the "rethrow" block we created in emitWasmCatchPadBlock().
-    // Wasm uses landingpad-style conditional branches to compare selectors, so
-    // we follow the false destination for each of the cond branches to reach
-    // the rethrow block.
-    llvm::BasicBlock *RethrowBlock = WasmCatchStartBlock;
-    while (llvm::Instruction *TI = RethrowBlock->getTerminator()) {
-      auto *BI = cast<llvm::BranchInst>(TI);
-      assert(BI->isConditional());
-      RethrowBlock = BI->getSuccessor(1);
-    }
-    assert(RethrowBlock != WasmCatchStartBlock && RethrowBlock->empty());
-    Builder.SetInsertPoint(RethrowBlock);
-    llvm::Function *RethrowInCatchFn =
-        CGM.getIntrinsic(llvm::Intrinsic::wasm_rethrow_in_catch);
-    EmitNoreturnRuntimeCallOrInvoke(RethrowInCatchFn, {});
-  }
-
-  EmitBlock(ContBB);
-  incrementProfileCounter(&S);
-}
-
-namespace {
-  struct CallEndCatchForFinally final : EHScopeStack::Cleanup {
-    llvm::Value *ForEHVar;
-    llvm::FunctionCallee EndCatchFn;
-    CallEndCatchForFinally(llvm::Value *ForEHVar,
-                           llvm::FunctionCallee EndCatchFn)
-        : ForEHVar(ForEHVar), EndCatchFn(EndCatchFn) {}
-
-    void Emit(CodeGenFunction &CGF, Flags flags) override {
-      llvm::BasicBlock *EndCatchBB = CGF.createBasicBlock("finally.endcatch");
-      llvm::BasicBlock *CleanupContBB =
-        CGF.createBasicBlock("finally.cleanup.cont");
-
-      llvm::Value *ShouldEndCatch =
-        CGF.Builder.CreateFlagLoad(ForEHVar, "finally.endcatch");
-      CGF.Builder.CreateCondBr(ShouldEndCatch, EndCatchBB, CleanupContBB);
-      CGF.EmitBlock(EndCatchBB);
-      CGF.EmitRuntimeCallOrInvoke(EndCatchFn); // catch-all, so might throw
-      CGF.EmitBlock(CleanupContBB);
-    }
-  };
-
-  struct PerformFinally final : EHScopeStack::Cleanup {
-    const Stmt *Body;
-    llvm::Value *ForEHVar;
-    llvm::FunctionCallee EndCatchFn;
-    llvm::FunctionCallee RethrowFn;
-    llvm::Value *SavedExnVar;
-
-    PerformFinally(const Stmt *Body, llvm::Value *ForEHVar,
-                   llvm::FunctionCallee EndCatchFn,
-                   llvm::FunctionCallee RethrowFn, llvm::Value *SavedExnVar)
-        : Body(Body), ForEHVar(ForEHVar), EndCatchFn(EndCatchFn),
-          RethrowFn(RethrowFn), SavedExnVar(SavedExnVar) {}
-
-    void Emit(CodeGenFunction &CGF, Flags flags) override {
-      // Enter a cleanup to call the end-catch function if one was provided.
-      if (EndCatchFn)
-        CGF.EHStack.pushCleanup<CallEndCatchForFinally>(NormalAndEHCleanup,
-                                                        ForEHVar, EndCatchFn);
-
-      // Save the current cleanup destination in case there are
-      // cleanups in the finally block.
-      llvm::Value *SavedCleanupDest =
-        CGF.Builder.CreateLoad(CGF.getNormalCleanupDestSlot(),
-                               "cleanup.dest.saved");
-
-      // Emit the finally block.
-      CGF.EmitStmt(Body);
-
-      // If the end of the finally is reachable, check whether this was
-      // for EH.  If so, rethrow.
-      if (CGF.HaveInsertPoint()) {
-        llvm::BasicBlock *RethrowBB = CGF.createBasicBlock("finally.rethrow");
-        llvm::BasicBlock *ContBB = CGF.createBasicBlock("finally.cont");
-
-        llvm::Value *ShouldRethrow =
-          CGF.Builder.CreateFlagLoad(ForEHVar, "finally.shouldthrow");
-        CGF.Builder.CreateCondBr(ShouldRethrow, RethrowBB, ContBB);
-
-        CGF.EmitBlock(RethrowBB);
-        if (SavedExnVar) {
-          CGF.EmitRuntimeCallOrInvoke(RethrowFn,
-            CGF.Builder.CreateAlignedLoad(SavedExnVar, CGF.getPointerAlign()));
-        } else {
-          CGF.EmitRuntimeCallOrInvoke(RethrowFn);
-        }
-        CGF.Builder.CreateUnreachable();
-
-        CGF.EmitBlock(ContBB);
-
-        // Restore the cleanup destination.
-        CGF.Builder.CreateStore(SavedCleanupDest,
-                                CGF.getNormalCleanupDestSlot());
-      }
-
-      // Leave the end-catch cleanup.  As an optimization, pretend that
-      // the fallthrough path was inaccessible; we've dynamically proven
-      // that we're not in the EH case along that path.
-      if (EndCatchFn) {
-        CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
-        CGF.PopCleanupBlock();
-        CGF.Builder.restoreIP(SavedIP);
-      }
-
-      // Now make sure we actually have an insertion point or the
-      // cleanup gods will hate us.
-      CGF.EnsureInsertPoint();
-    }
-  };
-} // end anonymous namespace
-
-/// Enters a finally block for an implementation using zero-cost
-/// exceptions.  This is mostly general, but hard-codes some
-/// language/ABI-specific behavior in the catch-all sections.
-void CodeGenFunction::FinallyInfo::enter(CodeGenFunction &CGF, const Stmt *body,
-                                         llvm::FunctionCallee beginCatchFn,
-                                         llvm::FunctionCallee endCatchFn,
-                                         llvm::FunctionCallee rethrowFn) {
-  assert((!!beginCatchFn) == (!!endCatchFn) &&
-         "begin/end catch functions not paired");
-  assert(rethrowFn && "rethrow function is required");
-
-  BeginCatchFn = beginCatchFn;
-
-  // The rethrow function has one of the following two types:
-  //   void (*)()
-  //   void (*)(void*)
-  // In the latter case we need to pass it the exception object.
-  // But we can't use the exception slot because the @finally might
-  // have a landing pad (which would overwrite the exception slot).
-  llvm::FunctionType *rethrowFnTy = rethrowFn.getFunctionType();
-  SavedExnVar = nullptr;
-  if (rethrowFnTy->getNumParams())
-    SavedExnVar = CGF.CreateTempAlloca(CGF.Int8PtrTy, "finally.exn");
-
-  // A finally block is a statement which must be executed on any edge
-  // out of a given scope.  Unlike a cleanup, the finally block may
-  // contain arbitrary control flow leading out of itself.  In
-  // addition, finally blocks should always be executed, even if there
-  // are no catch handlers higher on the stack.  Therefore, we
-  // surround the protected scope with a combination of a normal
-  // cleanup (to catch attempts to break out of the block via normal
-  // control flow) and an EH catch-all (semantically "outside" any try
-  // statement to which the finally block might have been attached).
-  // The finally block itself is generated in the context of a cleanup
-  // which conditionally leaves the catch-all.
-
-  // Jump destination for performing the finally block on an exception
-  // edge.  We'll never actually reach this block, so unreachable is
-  // fine.
-  RethrowDest = CGF.getJumpDestInCurrentScope(CGF.getUnreachableBlock());
-
-  // Whether the finally block is being executed for EH purposes.
-  ForEHVar = CGF.CreateTempAlloca(CGF.Builder.getInt1Ty(), "finally.for-eh");
-  CGF.Builder.CreateFlagStore(false, ForEHVar);
-
-  // Enter a normal cleanup which will perform the @finally block.
-  CGF.EHStack.pushCleanup<PerformFinally>(NormalCleanup, body,
-                                          ForEHVar, endCatchFn,
-                                          rethrowFn, SavedExnVar);
-
-  // Enter a catch-all scope.
-  llvm::BasicBlock *catchBB = CGF.createBasicBlock("finally.catchall");
-  EHCatchScope *catchScope = CGF.EHStack.pushCatch(1);
-  catchScope->setCatchAllHandler(0, catchBB);
-}
-
-void CodeGenFunction::FinallyInfo::exit(CodeGenFunction &CGF) {
-  // Leave the finally catch-all.
-  EHCatchScope &catchScope = cast<EHCatchScope>(*CGF.EHStack.begin());
-  llvm::BasicBlock *catchBB = catchScope.getHandler(0).Block;
-
-  CGF.popCatchScope();
-
-  // If there are any references to the catch-all block, emit it.
-  if (catchBB->use_empty()) {
-    delete catchBB;
-  } else {
-    CGBuilderTy::InsertPoint savedIP = CGF.Builder.saveAndClearIP();
-    CGF.EmitBlock(catchBB);
-
-    llvm::Value *exn = nullptr;
-
-    // If there's a begin-catch function, call it.
-    if (BeginCatchFn) {
-      exn = CGF.getExceptionFromSlot();
-      CGF.EmitNounwindRuntimeCall(BeginCatchFn, exn);
-    }
-
-    // If we need to remember the exception pointer to rethrow later, do so.
-    if (SavedExnVar) {
-      if (!exn) exn = CGF.getExceptionFromSlot();
-      CGF.Builder.CreateAlignedStore(exn, SavedExnVar, CGF.getPointerAlign());
-    }
-
-    // Tell the cleanups in the finally block that we're do this for EH.
-    CGF.Builder.CreateFlagStore(true, ForEHVar);
-
-    // Thread a jump through the finally cleanup.
-    CGF.EmitBranchThroughCleanup(RethrowDest);
-
-    CGF.Builder.restoreIP(savedIP);
-  }
-
-  // Finally, leave the @finally cleanup.
-  CGF.PopCleanupBlock();
-}
-
-llvm::BasicBlock *CodeGenFunction::getTerminateLandingPad() {
-  if (TerminateLandingPad)
-    return TerminateLandingPad;
-
-  CGBuilderTy::InsertPoint SavedIP = Builder.saveAndClearIP();
-
-  // This will get inserted at the end of the function.
-  TerminateLandingPad = createBasicBlock("terminate.lpad");
-  Builder.SetInsertPoint(TerminateLandingPad);
-
-  // Tell the backend that this is a landing pad.
-  const EHPersonality &Personality = EHPersonality::get(*this);
-
-  if (!CurFn->hasPersonalityFn())
-    CurFn->setPersonalityFn(getOpaquePersonalityFn(CGM, Personality));
-
-  llvm::LandingPadInst *LPadInst =
-      Builder.CreateLandingPad(llvm::StructType::get(Int8PtrTy, Int32Ty), 0);
-  LPadInst->addClause(getCatchAllValue(*this));
-
-  llvm::Value *Exn = nullptr;
-  if (getLangOpts().CPlusPlus)
-    Exn = Builder.CreateExtractValue(LPadInst, 0);
-  llvm::CallInst *terminateCall =
-      CGM.getCXXABI().emitTerminateForUnexpectedException(*this, Exn);
-  terminateCall->setDoesNotReturn();
-  Builder.CreateUnreachable();
-
-  // Restore the saved insertion state.
-  Builder.restoreIP(SavedIP);
-
-  return TerminateLandingPad;
-}
-
-llvm::BasicBlock *CodeGenFunction::getTerminateHandler() {
-  if (TerminateHandler)
-    return TerminateHandler;
-
-  // Set up the terminate handler.  This block is inserted at the very
-  // end of the function by FinishFunction.
-  TerminateHandler = createBasicBlock("terminate.handler");
-  CGBuilderTy::InsertPoint SavedIP = Builder.saveAndClearIP();
-  Builder.SetInsertPoint(TerminateHandler);
-
-  llvm::Value *Exn = nullptr;
-  if (getLangOpts().CPlusPlus)
-    Exn = getExceptionFromSlot();
-  llvm::CallInst *terminateCall =
-      CGM.getCXXABI().emitTerminateForUnexpectedException(*this, Exn);
-  terminateCall->setDoesNotReturn();
-  Builder.CreateUnreachable();
-
-  // Restore the saved insertion state.
-  Builder.restoreIP(SavedIP);
-
-  return TerminateHandler;
-}
-
-llvm::BasicBlock *CodeGenFunction::getTerminateFunclet() {
-  assert(EHPersonality::get(*this).usesFuncletPads() &&
-         "use getTerminateLandingPad for non-funclet EH");
-
-  llvm::BasicBlock *&TerminateFunclet = TerminateFunclets[CurrentFuncletPad];
-  if (TerminateFunclet)
-    return TerminateFunclet;
-
-  CGBuilderTy::InsertPoint SavedIP = Builder.saveAndClearIP();
-
-  // Set up the terminate handler.  This block is inserted at the very
-  // end of the function by FinishFunction.
-  TerminateFunclet = createBasicBlock("terminate.handler");
-  Builder.SetInsertPoint(TerminateFunclet);
-
-  // Create the cleanuppad using the current parent pad as its token. Use 'none'
-  // if this is a top-level terminate scope, which is the common case.
-  SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(
-      CurrentFuncletPad);
-  llvm::Value *ParentPad = CurrentFuncletPad;
-  if (!ParentPad)
-    ParentPad = llvm::ConstantTokenNone::get(CGM.getLLVMContext());
-  CurrentFuncletPad = Builder.CreateCleanupPad(ParentPad);
-
-  // Emit the __std_terminate call.
-  llvm::Value *Exn = nullptr;
-  // In case of wasm personality, we need to pass the exception value to
-  // __clang_call_terminate function.
-  if (getLangOpts().CPlusPlus &&
-      EHPersonality::get(*this).isWasmPersonality()) {
-    llvm::Function *GetExnFn =
-        CGM.getIntrinsic(llvm::Intrinsic::wasm_get_exception);
-    Exn = Builder.CreateCall(GetExnFn, CurrentFuncletPad);
-  }
-  llvm::CallInst *terminateCall =
-      CGM.getCXXABI().emitTerminateForUnexpectedException(*this, Exn);
-  terminateCall->setDoesNotReturn();
-  Builder.CreateUnreachable();
-
-  // Restore the saved insertion state.
-  Builder.restoreIP(SavedIP);
-
-  return TerminateFunclet;
-}
-
-llvm::BasicBlock *CodeGenFunction::getEHResumeBlock(bool isCleanup) {
-  if (EHResumeBlock) return EHResumeBlock;
-
-  CGBuilderTy::InsertPoint SavedIP = Builder.saveIP();
-
-  // We emit a jump to a notional label at the outermost unwind state.
-  EHResumeBlock = createBasicBlock("eh.resume");
-  Builder.SetInsertPoint(EHResumeBlock);
-
-  const EHPersonality &Personality = EHPersonality::get(*this);
-
-  // This can always be a call because we necessarily didn't find
-  // anything on the EH stack which needs our help.
-  const char *RethrowName = Personality.CatchallRethrowFn;
-  if (RethrowName != nullptr && !isCleanup) {
-    EmitRuntimeCall(getCatchallRethrowFn(CGM, RethrowName),
-                    getExceptionFromSlot())->setDoesNotReturn();
-    Builder.CreateUnreachable();
-    Builder.restoreIP(SavedIP);
-    return EHResumeBlock;
-  }
-
-  // Recreate the landingpad's return value for the 'resume' instruction.
-  llvm::Value *Exn = getExceptionFromSlot();
-  llvm::Value *Sel = getSelectorFromSlot();
-
-  llvm::Type *LPadType = llvm::StructType::get(Exn->getType(), Sel->getType());
-  llvm::Value *LPadVal = llvm::UndefValue::get(LPadType);
-  LPadVal = Builder.CreateInsertValue(LPadVal, Exn, 0, "lpad.val");
-  LPadVal = Builder.CreateInsertValue(LPadVal, Sel, 1, "lpad.val");
-
-  Builder.CreateResume(LPadVal);
-  Builder.restoreIP(SavedIP);
-  return EHResumeBlock;
-}
-
-void CodeGenFunction::EmitSEHTryStmt(const SEHTryStmt &S) {
-  EnterSEHTryStmt(S);
-  {
-    JumpDest TryExit = getJumpDestInCurrentScope("__try.__leave");
-
-    SEHTryEpilogueStack.push_back(&TryExit);
-    EmitStmt(S.getTryBlock());
-    SEHTryEpilogueStack.pop_back();
-
-    if (!TryExit.getBlock()->use_empty())
-      EmitBlock(TryExit.getBlock(), /*IsFinished=*/true);
-    else
-      delete TryExit.getBlock();
-  }
-  ExitSEHTryStmt(S);
-}
-
-namespace {
-struct PerformSEHFinally final : EHScopeStack::Cleanup {
-  llvm::Function *OutlinedFinally;
-  PerformSEHFinally(llvm::Function *OutlinedFinally)
-      : OutlinedFinally(OutlinedFinally) {}
-
-  void Emit(CodeGenFunction &CGF, Flags F) override {
-    ASTContext &Context = CGF.getContext();
-    CodeGenModule &CGM = CGF.CGM;
-
-    CallArgList Args;
-
-    // Compute the two argument values.
-    QualType ArgTys[2] = {Context.UnsignedCharTy, Context.VoidPtrTy};
-    llvm::Value *FP = nullptr;
-    // If CFG.IsOutlinedSEHHelper is true, then we are within a finally block.
-    if (CGF.IsOutlinedSEHHelper) {
-      FP = &CGF.CurFn->arg_begin()[1];
-    } else {
-      llvm::Function *LocalAddrFn =
-          CGM.getIntrinsic(llvm::Intrinsic::localaddress);
-      FP = CGF.Builder.CreateCall(LocalAddrFn);
-    }
-
-    llvm::Value *IsForEH =
-        llvm::ConstantInt::get(CGF.ConvertType(ArgTys[0]), F.isForEHCleanup());
-    Args.add(RValue::get(IsForEH), ArgTys[0]);
-    Args.add(RValue::get(FP), ArgTys[1]);
-
-    // Arrange a two-arg function info and type.
-    const CGFunctionInfo &FnInfo =
-        CGM.getTypes().arrangeBuiltinFunctionCall(Context.VoidTy, Args);
-
-    auto Callee = CGCallee::forDirect(OutlinedFinally);
-    CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args);
-  }
-};
-} // end anonymous namespace
-
-namespace {
-/// Find all local variable captures in the statement.
-struct CaptureFinder : ConstStmtVisitor<CaptureFinder> {
-  CodeGenFunction &ParentCGF;
-  const VarDecl *ParentThis;
-  llvm::SmallSetVector<const VarDecl *, 4> Captures;
-  Address SEHCodeSlot = Address::invalid();
-  CaptureFinder(CodeGenFunction &ParentCGF, const VarDecl *ParentThis)
-      : ParentCGF(ParentCGF), ParentThis(ParentThis) {}
-
-  // Return true if we need to do any capturing work.
-  bool foundCaptures() {
-    return !Captures.empty() || SEHCodeSlot.isValid();
-  }
-
-  void Visit(const Stmt *S) {
-    // See if this is a capture, then recurse.
-    ConstStmtVisitor<CaptureFinder>::Visit(S);
-    for (const Stmt *Child : S->children())
-      if (Child)
-        Visit(Child);
-  }
-
-  void VisitDeclRefExpr(const DeclRefExpr *E) {
-    // If this is already a capture, just make sure we capture 'this'.
-    if (E->refersToEnclosingVariableOrCapture()) {
-      Captures.insert(ParentThis);
-      return;
-    }
-
-    const auto *D = dyn_cast<VarDecl>(E->getDecl());
-    if (D && D->isLocalVarDeclOrParm() && D->hasLocalStorage())
-      Captures.insert(D);
-  }
-
-  void VisitCXXThisExpr(const CXXThisExpr *E) {
-    Captures.insert(ParentThis);
-  }
-
-  void VisitCallExpr(const CallExpr *E) {
-    // We only need to add parent frame allocations for these builtins in x86.
-    if (ParentCGF.getTarget().getTriple().getArch() != llvm::Triple::x86)
-      return;
-
-    unsigned ID = E->getBuiltinCallee();
-    switch (ID) {
-    case Builtin::BI__exception_code:
-    case Builtin::BI_exception_code:
-      // This is the simple case where we are the outermost finally. All we
-      // have to do here is make sure we escape this and recover it in the
-      // outlined handler.
-      if (!SEHCodeSlot.isValid())
-        SEHCodeSlot = ParentCGF.SEHCodeSlotStack.back();
-      break;
-    }
-  }
-};
-} // end anonymous namespace
-
-Address CodeGenFunction::recoverAddrOfEscapedLocal(CodeGenFunction &ParentCGF,
-                                                   Address ParentVar,
-                                                   llvm::Value *ParentFP) {
-  llvm::CallInst *RecoverCall = nullptr;
-  CGBuilderTy Builder(*this, AllocaInsertPt);
-  if (auto *ParentAlloca = dyn_cast<llvm::AllocaInst>(ParentVar.getPointer())) {
-    // Mark the variable escaped if nobody else referenced it and compute the
-    // localescape index.
-    auto InsertPair = ParentCGF.EscapedLocals.insert(
-        std::make_pair(ParentAlloca, ParentCGF.EscapedLocals.size()));
-    int FrameEscapeIdx = InsertPair.first->second;
-    // call i8* @llvm.localrecover(i8* bitcast(@parentFn), i8* %fp, i32 N)
-    llvm::Function *FrameRecoverFn = llvm::Intrinsic::getDeclaration(
-        &CGM.getModule(), llvm::Intrinsic::localrecover);
-    llvm::Constant *ParentI8Fn =
-        llvm::ConstantExpr::getBitCast(ParentCGF.CurFn, Int8PtrTy);
-    RecoverCall = Builder.CreateCall(
-        FrameRecoverFn, {ParentI8Fn, ParentFP,
-                         llvm::ConstantInt::get(Int32Ty, FrameEscapeIdx)});
-
-  } else {
-    // If the parent didn't have an alloca, we're doing some nested outlining.
-    // Just clone the existing localrecover call, but tweak the FP argument to
-    // use our FP value. All other arguments are constants.
-    auto *ParentRecover =
-        cast<llvm::IntrinsicInst>(ParentVar.getPointer()->stripPointerCasts());
-    assert(ParentRecover->getIntrinsicID() == llvm::Intrinsic::localrecover &&
-           "expected alloca or localrecover in parent LocalDeclMap");
-    RecoverCall = cast<llvm::CallInst>(ParentRecover->clone());
-    RecoverCall->setArgOperand(1, ParentFP);
-    RecoverCall->insertBefore(AllocaInsertPt);
-  }
-
-  // Bitcast the variable, rename it, and insert it in the local decl map.
-  llvm::Value *ChildVar =
-      Builder.CreateBitCast(RecoverCall, ParentVar.getType());
-  ChildVar->setName(ParentVar.getName());
-  return Address(ChildVar, ParentVar.getAlignment());
-}
-
-void CodeGenFunction::EmitCapturedLocals(CodeGenFunction &ParentCGF,
-                                         const Stmt *OutlinedStmt,
-                                         bool IsFilter) {
-  // Find all captures in the Stmt.
-  CaptureFinder Finder(ParentCGF, ParentCGF.CXXABIThisDecl);
-  Finder.Visit(OutlinedStmt);
-
-  // We can exit early on x86_64 when there are no captures. We just have to
-  // save the exception code in filters so that __exception_code() works.
-  if (!Finder.foundCaptures() &&
-      CGM.getTarget().getTriple().getArch() != llvm::Triple::x86) {
-    if (IsFilter)
-      EmitSEHExceptionCodeSave(ParentCGF, nullptr, nullptr);
-    return;
-  }
-
-  llvm::Value *EntryFP = nullptr;
-  CGBuilderTy Builder(CGM, AllocaInsertPt);
-  if (IsFilter && CGM.getTarget().getTriple().getArch() == llvm::Triple::x86) {
-    // 32-bit SEH filters need to be careful about FP recovery.  The end of the
-    // EH registration is passed in as the EBP physical register.  We can
-    // recover that with llvm.frameaddress(1).
-    EntryFP = Builder.CreateCall(
-        CGM.getIntrinsic(llvm::Intrinsic::frameaddress), {Builder.getInt32(1)});
-  } else {
-    // Otherwise, for x64 and 32-bit finally functions, the parent FP is the
-    // second parameter.
-    auto AI = CurFn->arg_begin();
-    ++AI;
-    EntryFP = &*AI;
-  }
-
-  llvm::Value *ParentFP = EntryFP;
-  if (IsFilter) {
-    // Given whatever FP the runtime provided us in EntryFP, recover the true
-    // frame pointer of the parent function. We only need to do this in filters,
-    // since finally funclets recover the parent FP for us.
-    llvm::Function *RecoverFPIntrin =
-        CGM.getIntrinsic(llvm::Intrinsic::eh_recoverfp);
-    llvm::Constant *ParentI8Fn =
-        llvm::ConstantExpr::getBitCast(ParentCGF.CurFn, Int8PtrTy);
-    ParentFP = Builder.CreateCall(RecoverFPIntrin, {ParentI8Fn, EntryFP});
-  }
-
-  // Create llvm.localrecover calls for all captures.
-  for (const VarDecl *VD : Finder.Captures) {
-    if (isa<ImplicitParamDecl>(VD)) {
-      CGM.ErrorUnsupported(VD, "'this' captured by SEH");
-      CXXThisValue = llvm::UndefValue::get(ConvertTypeForMem(VD->getType()));
-      continue;
-    }
-    if (VD->getType()->isVariablyModifiedType()) {
-      CGM.ErrorUnsupported(VD, "VLA captured by SEH");
-      continue;
-    }
-    assert((isa<ImplicitParamDecl>(VD) || VD->isLocalVarDeclOrParm()) &&
-           "captured non-local variable");
-
-    // If this decl hasn't been declared yet, it will be declared in the
-    // OutlinedStmt.
-    auto I = ParentCGF.LocalDeclMap.find(VD);
-    if (I == ParentCGF.LocalDeclMap.end())
-      continue;
-
-    Address ParentVar = I->second;
-    setAddrOfLocalVar(
-        VD, recoverAddrOfEscapedLocal(ParentCGF, ParentVar, ParentFP));
-  }
-
-  if (Finder.SEHCodeSlot.isValid()) {
-    SEHCodeSlotStack.push_back(
-        recoverAddrOfEscapedLocal(ParentCGF, Finder.SEHCodeSlot, ParentFP));
-  }
-
-  if (IsFilter)
-    EmitSEHExceptionCodeSave(ParentCGF, ParentFP, EntryFP);
-}
-
-/// Arrange a function prototype that can be called by Windows exception
-/// handling personalities. On Win64, the prototype looks like:
-/// RetTy func(void *EHPtrs, void *ParentFP);
-void CodeGenFunction::startOutlinedSEHHelper(CodeGenFunction &ParentCGF,
-                                             bool IsFilter,
-                                             const Stmt *OutlinedStmt) {
-  SourceLocation StartLoc = OutlinedStmt->getBeginLoc();
-
-  // Get the mangled function name.
-  SmallString<128> Name;
-  {
-    llvm::raw_svector_ostream OS(Name);
-    const NamedDecl *ParentSEHFn = ParentCGF.CurSEHParent;
-    assert(ParentSEHFn && "No CurSEHParent!");
-    MangleContext &Mangler = CGM.getCXXABI().getMangleContext();
-    if (IsFilter)
-      Mangler.mangleSEHFilterExpression(ParentSEHFn, OS);
-    else
-      Mangler.mangleSEHFinallyBlock(ParentSEHFn, OS);
-  }
-
-  FunctionArgList Args;
-  if (CGM.getTarget().getTriple().getArch() != llvm::Triple::x86 || !IsFilter) {
-    // All SEH finally functions take two parameters. Win64 filters take two
-    // parameters. Win32 filters take no parameters.
-    if (IsFilter) {
-      Args.push_back(ImplicitParamDecl::Create(
-          getContext(), /*DC=*/nullptr, StartLoc,
-          &getContext().Idents.get("exception_pointers"),
-          getContext().VoidPtrTy, ImplicitParamDecl::Other));
-    } else {
-      Args.push_back(ImplicitParamDecl::Create(
-          getContext(), /*DC=*/nullptr, StartLoc,
-          &getContext().Idents.get("abnormal_termination"),
-          getContext().UnsignedCharTy, ImplicitParamDecl::Other));
-    }
-    Args.push_back(ImplicitParamDecl::Create(
-        getContext(), /*DC=*/nullptr, StartLoc,
-        &getContext().Idents.get("frame_pointer"), getContext().VoidPtrTy,
-        ImplicitParamDecl::Other));
-  }
-
-  QualType RetTy = IsFilter ? getContext().LongTy : getContext().VoidTy;
-
-  const CGFunctionInfo &FnInfo =
-    CGM.getTypes().arrangeBuiltinFunctionDeclaration(RetTy, Args);
-
-  llvm::FunctionType *FnTy = CGM.getTypes().GetFunctionType(FnInfo);
-  llvm::Function *Fn = llvm::Function::Create(
-      FnTy, llvm::GlobalValue::InternalLinkage, Name.str(), &CGM.getModule());
-
-  IsOutlinedSEHHelper = true;
-
-  StartFunction(GlobalDecl(), RetTy, Fn, FnInfo, Args,
-                OutlinedStmt->getBeginLoc(), OutlinedStmt->getBeginLoc());
-  CurSEHParent = ParentCGF.CurSEHParent;
-
-  CGM.SetLLVMFunctionAttributes(GlobalDecl(), FnInfo, CurFn);
-  EmitCapturedLocals(ParentCGF, OutlinedStmt, IsFilter);
-}
-
-/// Create a stub filter function that will ultimately hold the code of the
-/// filter expression. The EH preparation passes in LLVM will outline the code
-/// from the main function body into this stub.
-llvm::Function *
-CodeGenFunction::GenerateSEHFilterFunction(CodeGenFunction &ParentCGF,
-                                           const SEHExceptStmt &Except) {
-  const Expr *FilterExpr = Except.getFilterExpr();
-  startOutlinedSEHHelper(ParentCGF, true, FilterExpr);
-
-  // Emit the original filter expression, convert to i32, and return.
-  llvm::Value *R = EmitScalarExpr(FilterExpr);
-  R = Builder.CreateIntCast(R, ConvertType(getContext().LongTy),
-                            FilterExpr->getType()->isSignedIntegerType());
-  Builder.CreateStore(R, ReturnValue);
-
-  FinishFunction(FilterExpr->getEndLoc());
-
-  return CurFn;
-}
-
-llvm::Function *
-CodeGenFunction::GenerateSEHFinallyFunction(CodeGenFunction &ParentCGF,
-                                            const SEHFinallyStmt &Finally) {
-  const Stmt *FinallyBlock = Finally.getBlock();
-  startOutlinedSEHHelper(ParentCGF, false, FinallyBlock);
-
-  // Emit the original filter expression, convert to i32, and return.
-  EmitStmt(FinallyBlock);
-
-  FinishFunction(FinallyBlock->getEndLoc());
-
-  return CurFn;
-}
-
-void CodeGenFunction::EmitSEHExceptionCodeSave(CodeGenFunction &ParentCGF,
-                                               llvm::Value *ParentFP,
-                                               llvm::Value *EntryFP) {
-  // Get the pointer to the EXCEPTION_POINTERS struct. This is returned by the
-  // __exception_info intrinsic.
-  if (CGM.getTarget().getTriple().getArch() != llvm::Triple::x86) {
-    // On Win64, the info is passed as the first parameter to the filter.
-    SEHInfo = &*CurFn->arg_begin();
-    SEHCodeSlotStack.push_back(
-        CreateMemTemp(getContext().IntTy, "__exception_code"));
-  } else {
-    // On Win32, the EBP on entry to the filter points to the end of an
-    // exception registration object. It contains 6 32-bit fields, and the info
-    // pointer is stored in the second field. So, GEP 20 bytes backwards and
-    // load the pointer.
-    SEHInfo = Builder.CreateConstInBoundsGEP1_32(Int8Ty, EntryFP, -20);
-    SEHInfo = Builder.CreateBitCast(SEHInfo, Int8PtrTy->getPointerTo());
-    SEHInfo = Builder.CreateAlignedLoad(Int8PtrTy, SEHInfo, getPointerAlign());
-    SEHCodeSlotStack.push_back(recoverAddrOfEscapedLocal(
-        ParentCGF, ParentCGF.SEHCodeSlotStack.back(), ParentFP));
-  }
-
-  // Save the exception code in the exception slot to unify exception access in
-  // the filter function and the landing pad.
-  // struct EXCEPTION_POINTERS {
-  //   EXCEPTION_RECORD *ExceptionRecord;
-  //   CONTEXT *ContextRecord;
-  // };
-  // int exceptioncode = exception_pointers->ExceptionRecord->ExceptionCode;
-  llvm::Type *RecordTy = CGM.Int32Ty->getPointerTo();
-  llvm::Type *PtrsTy = llvm::StructType::get(RecordTy, CGM.VoidPtrTy);
-  llvm::Value *Ptrs = Builder.CreateBitCast(SEHInfo, PtrsTy->getPointerTo());
-  llvm::Value *Rec = Builder.CreateStructGEP(PtrsTy, Ptrs, 0);
-  Rec = Builder.CreateAlignedLoad(Rec, getPointerAlign());
-  llvm::Value *Code = Builder.CreateAlignedLoad(Rec, getIntAlign());
-  assert(!SEHCodeSlotStack.empty() && "emitting EH code outside of __except");
-  Builder.CreateStore(Code, SEHCodeSlotStack.back());
-}
-
-llvm::Value *CodeGenFunction::EmitSEHExceptionInfo() {
-  // Sema should diagnose calling this builtin outside of a filter context, but
-  // don't crash if we screw up.
-  if (!SEHInfo)
-    return llvm::UndefValue::get(Int8PtrTy);
-  assert(SEHInfo->getType() == Int8PtrTy);
-  return SEHInfo;
-}
-
-llvm::Value *CodeGenFunction::EmitSEHExceptionCode() {
-  assert(!SEHCodeSlotStack.empty() && "emitting EH code outside of __except");
-  return Builder.CreateLoad(SEHCodeSlotStack.back());
-}
-
-llvm::Value *CodeGenFunction::EmitSEHAbnormalTermination() {
-  // Abnormal termination is just the first parameter to the outlined finally
-  // helper.
-  auto AI = CurFn->arg_begin();
-  return Builder.CreateZExt(&*AI, Int32Ty);
-}
-
-void CodeGenFunction::pushSEHCleanup(CleanupKind Kind,
-                                     llvm::Function *FinallyFunc) {
-  EHStack.pushCleanup<PerformSEHFinally>(Kind, FinallyFunc);
-}
-
-void CodeGenFunction::EnterSEHTryStmt(const SEHTryStmt &S) {
-  CodeGenFunction HelperCGF(CGM, /*suppressNewContext=*/true);
-  if (const SEHFinallyStmt *Finally = S.getFinallyHandler()) {
-    // Outline the finally block.
-    llvm::Function *FinallyFunc =
-        HelperCGF.GenerateSEHFinallyFunction(*this, *Finally);
-
-    // Push a cleanup for __finally blocks.
-    EHStack.pushCleanup<PerformSEHFinally>(NormalAndEHCleanup, FinallyFunc);
-    return;
-  }
-
-  // Otherwise, we must have an __except block.
-  const SEHExceptStmt *Except = S.getExceptHandler();
-  assert(Except);
-  EHCatchScope *CatchScope = EHStack.pushCatch(1);
-  SEHCodeSlotStack.push_back(
-      CreateMemTemp(getContext().IntTy, "__exception_code"));
-
-  // If the filter is known to evaluate to 1, then we can use the clause
-  // "catch i8* null". We can't do this on x86 because the filter has to save
-  // the exception code.
-  llvm::Constant *C =
-    ConstantEmitter(*this).tryEmitAbstract(Except->getFilterExpr(),
-                                           getContext().IntTy);
-  if (CGM.getTarget().getTriple().getArch() != llvm::Triple::x86 && C &&
-      C->isOneValue()) {
-    CatchScope->setCatchAllHandler(0, createBasicBlock("__except"));
-    return;
-  }
-
-  // In general, we have to emit an outlined filter function. Use the function
-  // in place of the RTTI typeinfo global that C++ EH uses.
-  llvm::Function *FilterFunc =
-      HelperCGF.GenerateSEHFilterFunction(*this, *Except);
-  llvm::Constant *OpaqueFunc =
-      llvm::ConstantExpr::getBitCast(FilterFunc, Int8PtrTy);
-  CatchScope->setHandler(0, OpaqueFunc, createBasicBlock("__except.ret"));
-}
-
-void CodeGenFunction::ExitSEHTryStmt(const SEHTryStmt &S) {
-  // Just pop the cleanup if it's a __finally block.
-  if (S.getFinallyHandler()) {
-    PopCleanupBlock();
-    return;
-  }
-
-  // Otherwise, we must have an __except block.
-  const SEHExceptStmt *Except = S.getExceptHandler();
-  assert(Except && "__try must have __finally xor __except");
-  EHCatchScope &CatchScope = cast<EHCatchScope>(*EHStack.begin());
-
-  // Don't emit the __except block if the __try block lacked invokes.
-  // TODO: Model unwind edges from instructions, either with iload / istore or
-  // a try body function.
-  if (!CatchScope.hasEHBranches()) {
-    CatchScope.clearHandlerBlocks();
-    EHStack.popCatch();
-    SEHCodeSlotStack.pop_back();
-    return;
-  }
-
-  // The fall-through block.
-  llvm::BasicBlock *ContBB = createBasicBlock("__try.cont");
-
-  // We just emitted the body of the __try; jump to the continue block.
-  if (HaveInsertPoint())
-    Builder.CreateBr(ContBB);
-
-  // Check if our filter function returned true.
-  emitCatchDispatchBlock(*this, CatchScope);
-
-  // Grab the block before we pop the handler.
-  llvm::BasicBlock *CatchPadBB = CatchScope.getHandler(0).Block;
-  EHStack.popCatch();
-
-  EmitBlockAfterUses(CatchPadBB);
-
-  // __except blocks don't get outlined into funclets, so immediately do a
-  // catchret.
-  llvm::CatchPadInst *CPI =
-      cast<llvm::CatchPadInst>(CatchPadBB->getFirstNonPHI());
-  llvm::BasicBlock *ExceptBB = createBasicBlock("__except");
-  Builder.CreateCatchRet(CPI, ExceptBB);
-  EmitBlock(ExceptBB);
-
-  // On Win64, the exception code is returned in EAX. Copy it into the slot.
-  if (CGM.getTarget().getTriple().getArch() != llvm::Triple::x86) {
-    llvm::Function *SEHCodeIntrin =
-        CGM.getIntrinsic(llvm::Intrinsic::eh_exceptioncode);
-    llvm::Value *Code = Builder.CreateCall(SEHCodeIntrin, {CPI});
-    Builder.CreateStore(Code, SEHCodeSlotStack.back());
-  }
-
-  // Emit the __except body.
-  EmitStmt(Except->getBlock());
-
-  // End the lifetime of the exception code.
-  SEHCodeSlotStack.pop_back();
-
-  if (HaveInsertPoint())
-    Builder.CreateBr(ContBB);
-
-  EmitBlock(ContBB);
-}
-
-void CodeGenFunction::EmitSEHLeaveStmt(const SEHLeaveStmt &S) {
-  // If this code is reachable then emit a stop point (if generating
-  // debug info). We have to do this ourselves because we are on the
-  // "simple" statement path.
-  if (HaveInsertPoint())
-    EmitStopPoint(&S);
-
-  // This must be a __leave from a __finally block, which we warn on and is UB.
-  // Just emit unreachable.
-  if (!isSEHTryScope()) {
-    Builder.CreateUnreachable();
-    Builder.ClearInsertionPoint();
-    return;
-  }
-
-  EmitBranchThroughCleanup(*SEHTryEpilogueStack.back());
-}