clang/lib/CodeGen/CGNonTrivialStruct.cpp

   1 //===--- CGNonTrivialStruct.cpp - Emit Special Functions for C Structs ----===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file defines functions to generate various special functions for C
  10 // structs.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "CodeGenFunction.h"
  15 #include "CodeGenModule.h"
  16 #include "clang/AST/NonTrivialTypeVisitor.h"
  17 #include "clang/CodeGen/CodeGenABITypes.h"
  18 #include "llvm/Support/ScopedPrinter.h"
  19 #include <array>
  20
  21 using namespace clang;
  22 using namespace CodeGen;
  23
  24 // Return the size of a field in number of bits.
  25 static uint64_t getFieldSize(const FieldDecl *FD, QualType FT,
  26                              ASTContext &Ctx) {
  27   if (FD && FD->isBitField())
  28     return FD->getBitWidthValue(Ctx);
  29   return Ctx.getTypeSize(FT);
  30 }
  31
  32 namespace {
  33 enum { DstIdx = 0, SrcIdx = 1 };
  34 const char *ValNameStr[2] = {"dst", "src"};
  35
  36 template <class Derived> struct StructVisitor {
  37   StructVisitor(ASTContext &Ctx) : Ctx(Ctx) {}
  38
  39   template <class... Ts>
  40   void visitStructFields(QualType QT, CharUnits CurStructOffset, Ts... Args) {
  41     const RecordDecl *RD = QT->castAs<RecordType>()->getDecl();
  42
  43     // Iterate over the fields of the struct.
  44     for (const FieldDecl *FD : RD->fields()) {
  45       QualType FT = FD->getType();
  46       FT = QT.isVolatileQualified() ? FT.withVolatile() : FT;
  47       asDerived().visit(FT, FD, CurStructOffset, Args...);
  48     }
  49
  50     asDerived().flushTrivialFields(Args...);
  51   }
  52
  53   template <class... Ts> void visitTrivial(Ts... Args) {}
  54
  55   template <class... Ts> void visitCXXDestructor(Ts... Args) {
  56     llvm_unreachable("field of a C++ struct type is not expected");
  57   }
  58
  59   template <class... Ts> void flushTrivialFields(Ts... Args) {}
  60
  61   uint64_t getFieldOffsetInBits(const FieldDecl *FD) {
  62     return FD ? Ctx.getASTRecordLayout(FD->getParent())
  63                     .getFieldOffset(FD->getFieldIndex())
  64               : 0;
  65   }
  66
  67   CharUnits getFieldOffset(const FieldDecl *FD) {
  68     return Ctx.toCharUnitsFromBits(getFieldOffsetInBits(FD));
  69   }
  70
  71   Derived &asDerived() { return static_cast<Derived &>(*this); }
  72
  73   ASTContext &getContext() { return Ctx; }
  74   ASTContext &Ctx;
  75 };
  76
  77 template <class Derived, bool IsMove>
  78 struct CopyStructVisitor : StructVisitor<Derived>,
  79                            CopiedTypeVisitor<Derived, IsMove> {
  80   using StructVisitor<Derived>::asDerived;
  81   using Super = CopiedTypeVisitor<Derived, IsMove>;
  82
  83   CopyStructVisitor(ASTContext &Ctx) : StructVisitor<Derived>(Ctx) {}
  84
  85   template <class... Ts>
  86   void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
  87                 const FieldDecl *FD, CharUnits CurStructOffset, Ts &&... Args) {
  88     if (PCK)
  89       asDerived().flushTrivialFields(std::forward<Ts>(Args)...);
  90   }
  91
  92   template <class... Ts>
  93   void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
  94                      const FieldDecl *FD, CharUnits CurStructOffset,
  95                      Ts &&... Args) {
  96     if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
  97       asDerived().visitArray(PCK, AT, FT.isVolatileQualified(), FD,
  98                              CurStructOffset, std::forward<Ts>(Args)...);
  99       return;
 100     }
 101
 102     Super::visitWithKind(PCK, FT, FD, CurStructOffset,
 103                          std::forward<Ts>(Args)...);
 104   }
 105
 106   template <class... Ts>
 107   void visitTrivial(QualType FT, const FieldDecl *FD, CharUnits CurStructOffset,
 108                     Ts... Args) {
 109     assert(!FT.isVolatileQualified() && "volatile field not expected");
 110     ASTContext &Ctx = asDerived().getContext();
 111     uint64_t FieldSize = getFieldSize(FD, FT, Ctx);
 112
 113     // Ignore zero-sized fields.
 114     if (FieldSize == 0)
 115       return;
 116
 117     uint64_t FStartInBits = asDerived().getFieldOffsetInBits(FD);
 118     uint64_t FEndInBits = FStartInBits + FieldSize;
 119     uint64_t RoundedFEnd = llvm::alignTo(FEndInBits, Ctx.getCharWidth());
 120
 121     // Set Start if this is the first field of a sequence of trivial fields.
 122     if (Start == End)
 123       Start = CurStructOffset + Ctx.toCharUnitsFromBits(FStartInBits);
 124     End = CurStructOffset + Ctx.toCharUnitsFromBits(RoundedFEnd);
 125   }
 126
 127   CharUnits Start = CharUnits::Zero(), End = CharUnits::Zero();
 128 };
 129
 130 // This function creates the mangled name of a special function of a non-trivial
 131 // C struct. Since there is no ODR in C, the function is mangled based on the
 132 // struct contents and not the name. The mangled name has the following
 133 // structure:
 134 //
 135 // <function-name> ::= <prefix> <alignment-info> "_" <struct-field-info>
 136 // <prefix> ::= "__destructor_" | "__default_constructor_" |
 137 //              "__copy_constructor_" | "__move_constructor_" |
 138 //              "__copy_assignment_" | "__move_assignment_"
 139 // <alignment-info> ::= <dst-alignment> ["_" <src-alignment>]
 140 // <struct-field-info> ::= <field-info>+
 141 // <field-info> ::= <struct-or-scalar-field-info> | <array-field-info>
 142 // <struct-or-scalar-field-info> ::= "_S" <struct-field-info> |
 143 //                                   <strong-field-info> | <trivial-field-info>
 144 // <array-field-info> ::= "_AB" <array-offset> "s" <element-size> "n"
 145 //                        <num-elements> <innermost-element-info> "_AE"
 146 // <innermost-element-info> ::= <struct-or-scalar-field-info>
 147 // <strong-field-info> ::= "_s" ["b"] ["v"] <field-offset>
 148 // <trivial-field-info> ::= "_t" ["v"] <field-offset> "_" <field-size>
 149
 150 template <class Derived> struct GenFuncNameBase {
 151   std::string getVolatileOffsetStr(bool IsVolatile, CharUnits Offset) {
 152     std::string S;
 153     if (IsVolatile)
 154       S = "v";
 155     S += llvm::to_string(Offset.getQuantity());
 156     return S;
 157   }
 158
 159   void visitARCStrong(QualType FT, const FieldDecl *FD,
 160                       CharUnits CurStructOffset) {
 161     appendStr("_s");
 162     if (FT->isBlockPointerType())
 163       appendStr("b");
 164     CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
 165     appendStr(getVolatileOffsetStr(FT.isVolatileQualified(), FieldOffset));
 166   }
 167
 168   void visitARCWeak(QualType FT, const FieldDecl *FD,
 169                     CharUnits CurStructOffset) {
 170     appendStr("_w");
 171     CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
 172     appendStr(getVolatileOffsetStr(FT.isVolatileQualified(), FieldOffset));
 173   }
 174
 175   void visitStruct(QualType QT, const FieldDecl *FD,
 176                    CharUnits CurStructOffset) {
 177     CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
 178     appendStr("_S");
 179     asDerived().visitStructFields(QT, FieldOffset);
 180   }
 181
 182   template <class FieldKind>
 183   void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
 184                   const FieldDecl *FD, CharUnits CurStructOffset) {
 185     // String for non-volatile trivial fields is emitted when
 186     // flushTrivialFields is called.
 187     if (!FK)
 188       return asDerived().visitTrivial(QualType(AT, 0), FD, CurStructOffset);
 189
 190     asDerived().flushTrivialFields();
 191     CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
 192     ASTContext &Ctx = asDerived().getContext();
 193     const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
 194     unsigned NumElts = Ctx.getConstantArrayElementCount(CAT);
 195     QualType EltTy = Ctx.getBaseElementType(CAT);
 196     CharUnits EltSize = Ctx.getTypeSizeInChars(EltTy);
 197     appendStr("_AB" + llvm::to_string(FieldOffset.getQuantity()) + "s" +
 198               llvm::to_string(EltSize.getQuantity()) + "n" +
 199               llvm::to_string(NumElts));
 200     EltTy = IsVolatile ? EltTy.withVolatile() : EltTy;
 201     asDerived().visitWithKind(FK, EltTy, nullptr, FieldOffset);
 202     appendStr("_AE");
 203   }
 204
 205   void appendStr(StringRef Str) { Name += Str; }
 206
 207   std::string getName(QualType QT, bool IsVolatile) {
 208     QT = IsVolatile ? QT.withVolatile() : QT;
 209     asDerived().visitStructFields(QT, CharUnits::Zero());
 210     return Name;
 211   }
 212
 213   Derived &asDerived() { return static_cast<Derived &>(*this); }
 214
 215   std::string Name;
 216 };
 217
 218 template <class Derived>
 219 struct GenUnaryFuncName : StructVisitor<Derived>, GenFuncNameBase<Derived> {
 220   GenUnaryFuncName(StringRef Prefix, CharUnits DstAlignment, ASTContext &Ctx)
 221       : StructVisitor<Derived>(Ctx) {
 222     this->appendStr(Prefix);
 223     this->appendStr(llvm::to_string(DstAlignment.getQuantity()));
 224   }
 225 };
 226
 227 // Helper function to create a null constant.
 228 static llvm::Constant *getNullForVariable(Address Addr) {
 229   llvm::Type *Ty = Addr.getElementType();
 230   return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(Ty));
 231 }
 232
 233 template <bool IsMove>
 234 struct GenBinaryFuncName : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>,
 235                            GenFuncNameBase<GenBinaryFuncName<IsMove>> {
 236
 237   GenBinaryFuncName(StringRef Prefix, CharUnits DstAlignment,
 238                     CharUnits SrcAlignment, ASTContext &Ctx)
 239       : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>(Ctx) {
 240     this->appendStr(Prefix);
 241     this->appendStr(llvm::to_string(DstAlignment.getQuantity()));
 242     this->appendStr("_" + llvm::to_string(SrcAlignment.getQuantity()));
 243   }
 244
 245   void flushTrivialFields() {
 246     if (this->Start == this->End)
 247       return;
 248
 249     this->appendStr("_t" + llvm::to_string(this->Start.getQuantity()) + "w" +
 250                     llvm::to_string((this->End - this->Start).getQuantity()));
 251
 252     this->Start = this->End = CharUnits::Zero();
 253   }
 254
 255   void visitVolatileTrivial(QualType FT, const FieldDecl *FD,
 256                             CharUnits CurStructOffset) {
 257     // Zero-length bit-fields don't need to be copied/assigned.
 258     if (FD && FD->isZeroLengthBitField(this->Ctx))
 259       return;
 260
 261     // Because volatile fields can be bit-fields and are individually copied,
 262     // their offset and width are in bits.
 263     uint64_t OffsetInBits =
 264         this->Ctx.toBits(CurStructOffset) + this->getFieldOffsetInBits(FD);
 265     this->appendStr("_tv" + llvm::to_string(OffsetInBits) + "w" +
 266                     llvm::to_string(getFieldSize(FD, FT, this->Ctx)));
 267   }
 268 };
 269
 270 struct GenDefaultInitializeFuncName
 271     : GenUnaryFuncName<GenDefaultInitializeFuncName>,
 272       DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName> {
 273   using Super = DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName>;
 274   GenDefaultInitializeFuncName(CharUnits DstAlignment, ASTContext &Ctx)
 275       : GenUnaryFuncName<GenDefaultInitializeFuncName>("__default_constructor_",
 276                                                        DstAlignment, Ctx) {}
 277   void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
 278                      const FieldDecl *FD, CharUnits CurStructOffset) {
 279     if (const auto *AT = getContext().getAsArrayType(FT)) {
 280       visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
 281       return;
 282     }
 283
 284     Super::visitWithKind(PDIK, FT, FD, CurStructOffset);
 285   }
 286 };
 287
 288 struct GenDestructorFuncName : GenUnaryFuncName<GenDestructorFuncName>,
 289                                DestructedTypeVisitor<GenDestructorFuncName> {
 290   using Super = DestructedTypeVisitor<GenDestructorFuncName>;
 291   GenDestructorFuncName(const char *Prefix, CharUnits DstAlignment,
 292                         ASTContext &Ctx)
 293       : GenUnaryFuncName<GenDestructorFuncName>(Prefix, DstAlignment, Ctx) {}
 294   void visitWithKind(QualType::DestructionKind DK, QualType FT,
 295                      const FieldDecl *FD, CharUnits CurStructOffset) {
 296     if (const auto *AT = getContext().getAsArrayType(FT)) {
 297       visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
 298       return;
 299     }
 300
 301     Super::visitWithKind(DK, FT, FD, CurStructOffset);
 302   }
 303 };
 304
 305 // Helper function that creates CGFunctionInfo for an N-ary special function.
 306 template <size_t N>
 307 static const CGFunctionInfo &getFunctionInfo(CodeGenModule &CGM,
 308                                              FunctionArgList &Args) {
 309   ASTContext &Ctx = CGM.getContext();
 310   llvm::SmallVector<ImplicitParamDecl *, N> Params;
 311   QualType ParamTy = Ctx.getPointerType(Ctx.VoidPtrTy);
 312
 313   for (unsigned I = 0; I < N; ++I)
 314     Params.push_back(ImplicitParamDecl::Create(
 315         Ctx, nullptr, SourceLocation(), &Ctx.Idents.get(ValNameStr[I]), ParamTy,
 316         ImplicitParamDecl::Other));
 317
 318   llvm::append_range(Args, Params);
 319
 320   return CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
 321 }
 322
 323 template <size_t N, size_t... Ints>
 324 static std::array<Address, N> getParamAddrs(std::index_sequence<Ints...> IntSeq,
 325                                             std::array<CharUnits, N> Alignments,
 326                                             const FunctionArgList &Args,
 327                                             CodeGenFunction *CGF) {
 328   return std::array<Address, N>{
 329       {Address(CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[Ints])),
 330                CGF->VoidPtrTy, Alignments[Ints], KnownNonNull)...}};
 331 }
 332
 333 // Template classes that are used as bases for classes that emit special
 334 // functions.
 335 template <class Derived> struct GenFuncBase {
 336   template <size_t N>
 337   void visitStruct(QualType FT, const FieldDecl *FD, CharUnits CurStructOffset,
 338                    std::array<Address, N> Addrs) {
 339     this->asDerived().callSpecialFunction(
 340         FT, CurStructOffset + asDerived().getFieldOffset(FD), Addrs);
 341   }
 342
 343   template <class FieldKind, size_t N>
 344   void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
 345                   const FieldDecl *FD, CharUnits CurStructOffset,
 346                   std::array<Address, N> Addrs) {
 347     // Non-volatile trivial fields are copied when flushTrivialFields is called.
 348     if (!FK)
 349       return asDerived().visitTrivial(QualType(AT, 0), FD, CurStructOffset,
 350                                       Addrs);
 351
 352     asDerived().flushTrivialFields(Addrs);
 353     CodeGenFunction &CGF = *this->CGF;
 354     ASTContext &Ctx = CGF.getContext();
 355
 356     // Compute the end address.
 357     QualType BaseEltQT;
 358     std::array<Address, N> StartAddrs = Addrs;
 359     for (unsigned I = 0; I < N; ++I)
 360       StartAddrs[I] = getAddrWithOffset(Addrs[I], CurStructOffset, FD);
 361     Address DstAddr = StartAddrs[DstIdx];
 362     llvm::Value *NumElts = CGF.emitArrayLength(AT, BaseEltQT, DstAddr);
 363     unsigned BaseEltSize = Ctx.getTypeSizeInChars(BaseEltQT).getQuantity();
 364     llvm::Value *BaseEltSizeVal =
 365         llvm::ConstantInt::get(NumElts->getType(), BaseEltSize);
 366     llvm::Value *SizeInBytes =
 367         CGF.Builder.CreateNUWMul(BaseEltSizeVal, NumElts);
 368     llvm::Value *DstArrayEnd = CGF.Builder.CreateInBoundsGEP(
 369         CGF.Int8Ty, DstAddr.getPointer(), SizeInBytes);
 370     DstArrayEnd = CGF.Builder.CreateBitCast(
 371         DstArrayEnd, CGF.CGM.Int8PtrPtrTy, "dstarray.end");
 372     llvm::BasicBlock *PreheaderBB = CGF.Builder.GetInsertBlock();
 373
 374     // Create the header block and insert the phi instructions.
 375     llvm::BasicBlock *HeaderBB = CGF.createBasicBlock("loop.header");
 376     CGF.EmitBlock(HeaderBB);
 377     llvm::PHINode *PHIs[N];
 378
 379     for (unsigned I = 0; I < N; ++I) {
 380       PHIs[I] = CGF.Builder.CreatePHI(CGF.CGM.Int8PtrPtrTy, 2, "addr.cur");
 381       PHIs[I]->addIncoming(StartAddrs[I].getPointer(), PreheaderBB);
 382     }
 383
 384     // Create the exit and loop body blocks.
 385     llvm::BasicBlock *ExitBB = CGF.createBasicBlock("loop.exit");
 386     llvm::BasicBlock *LoopBB = CGF.createBasicBlock("loop.body");
 387
 388     // Emit the comparison and conditional branch instruction that jumps to
 389     // either the exit or the loop body.
 390     llvm::Value *Done =
 391         CGF.Builder.CreateICmpEQ(PHIs[DstIdx], DstArrayEnd, "done");
 392     CGF.Builder.CreateCondBr(Done, ExitBB, LoopBB);
 393
 394     // Visit the element of the array in the loop body.
 395     CGF.EmitBlock(LoopBB);
 396     QualType EltQT = AT->getElementType();
 397     CharUnits EltSize = Ctx.getTypeSizeInChars(EltQT);
 398     std::array<Address, N> NewAddrs = Addrs;
 399
 400     for (unsigned I = 0; I < N; ++I)
 401       NewAddrs[I] =
 402             Address(PHIs[I], CGF.Int8PtrTy,
 403                     StartAddrs[I].getAlignment().alignmentAtOffset(EltSize));
 404
 405     EltQT = IsVolatile ? EltQT.withVolatile() : EltQT;
 406     this->asDerived().visitWithKind(FK, EltQT, nullptr, CharUnits::Zero(),
 407                                     NewAddrs);
 408
 409     LoopBB = CGF.Builder.GetInsertBlock();
 410
 411     for (unsigned I = 0; I < N; ++I) {
 412       // Instrs to update the destination and source addresses.
 413       // Update phi instructions.
 414       NewAddrs[I] = getAddrWithOffset(NewAddrs[I], EltSize);
 415       PHIs[I]->addIncoming(NewAddrs[I].getPointer(), LoopBB);
 416     }
 417
 418     // Insert an unconditional branch to the header block.
 419     CGF.Builder.CreateBr(HeaderBB);
 420     CGF.EmitBlock(ExitBB);
 421   }
 422
 423   /// Return an address with the specified offset from the passed address.
 424   Address getAddrWithOffset(Address Addr, CharUnits Offset) {
 425     assert(Addr.isValid() && "invalid address");
 426     if (Offset.getQuantity() == 0)
 427       return Addr;
 428     Addr = Addr.withElementType(CGF->CGM.Int8Ty);
 429     Addr = CGF->Builder.CreateConstInBoundsGEP(Addr, Offset.getQuantity());
 430     return Addr.withElementType(CGF->CGM.Int8PtrTy);
 431   }
 432
 433   Address getAddrWithOffset(Address Addr, CharUnits StructFieldOffset,
 434                             const FieldDecl *FD) {
 435     return getAddrWithOffset(Addr, StructFieldOffset +
 436                                        asDerived().getFieldOffset(FD));
 437   }
 438
 439   template <size_t N>
 440   llvm::Function *getFunction(StringRef FuncName, QualType QT,
 441                               std::array<CharUnits, N> Alignments,
 442                               CodeGenModule &CGM) {
 443     // If the special function already exists in the module, return it.
 444     if (llvm::Function *F = CGM.getModule().getFunction(FuncName)) {
 445       bool WrongType = false;
 446       if (!F->getReturnType()->isVoidTy())
 447         WrongType = true;
 448       else {
 449         for (const llvm::Argument &Arg : F->args())
 450           if (Arg.getType() != CGM.Int8PtrPtrTy)
 451             WrongType = true;
 452       }
 453
 454       if (WrongType) {
 455         std::string FuncName = std::string(F->getName());
 456         SourceLocation Loc = QT->castAs<RecordType>()->getDecl()->getLocation();
 457         CGM.Error(Loc, "special function " + FuncName +
 458                            " for non-trivial C struct has incorrect type");
 459         return nullptr;
 460       }
 461       return F;
 462     }
 463
 464     ASTContext &Ctx = CGM.getContext();
 465     FunctionArgList Args;
 466     const CGFunctionInfo &FI = getFunctionInfo<N>(CGM, Args);
 467     llvm::FunctionType *FuncTy = CGM.getTypes().GetFunctionType(FI);
 468     llvm::Function *F =
 469         llvm::Function::Create(FuncTy, llvm::GlobalValue::LinkOnceODRLinkage,
 470                                FuncName, &CGM.getModule());
 471     F->setVisibility(llvm::GlobalValue::HiddenVisibility);
 472     CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F, /*IsThunk=*/false);
 473     CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
 474     CodeGenFunction NewCGF(CGM);
 475     setCGF(&NewCGF);
 476     CGF->StartFunction(GlobalDecl(), Ctx.VoidTy, F, FI, Args);
 477     auto AL = ApplyDebugLocation::CreateArtificial(*CGF);
 478     std::array<Address, N> Addrs =
 479         getParamAddrs<N>(std::make_index_sequence<N>{}, Alignments, Args, CGF);
 480     asDerived().visitStructFields(QT, CharUnits::Zero(), Addrs);
 481     CGF->FinishFunction();
 482     return F;
 483   }
 484
 485   template <size_t N>
 486   void callFunc(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
 487                 CodeGenFunction &CallerCGF) {
 488     std::array<CharUnits, N> Alignments;
 489     llvm::Value *Ptrs[N];
 490
 491     for (unsigned I = 0; I < N; ++I) {
 492       Alignments[I] = Addrs[I].getAlignment();
 493       Ptrs[I] = Addrs[I].getPointer();
 494     }
 495
 496     if (llvm::Function *F =
 497             getFunction(FuncName, QT, Alignments, CallerCGF.CGM))
 498       CallerCGF.EmitNounwindRuntimeCall(F, Ptrs);
 499   }
 500
 501   Derived &asDerived() { return static_cast<Derived &>(*this); }
 502
 503   void setCGF(CodeGenFunction *F) { CGF = F; }
 504
 505   CodeGenFunction *CGF = nullptr;
 506 };
 507
 508 template <class Derived, bool IsMove>
 509 struct GenBinaryFunc : CopyStructVisitor<Derived, IsMove>,
 510                        GenFuncBase<Derived> {
 511   GenBinaryFunc(ASTContext &Ctx) : CopyStructVisitor<Derived, IsMove>(Ctx) {}
 512
 513   void flushTrivialFields(std::array<Address, 2> Addrs) {
 514     CharUnits Size = this->End - this->Start;
 515
 516     if (Size.getQuantity() == 0)
 517       return;
 518
 519     Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], this->Start);
 520     Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], this->Start);
 521
 522     // Emit memcpy.
 523     if (Size.getQuantity() >= 16 ||
 524         !llvm::has_single_bit<uint32_t>(Size.getQuantity())) {
 525       llvm::Value *SizeVal =
 526           llvm::ConstantInt::get(this->CGF->SizeTy, Size.getQuantity());
 527       DstAddr = DstAddr.withElementType(this->CGF->Int8Ty);
 528       SrcAddr = SrcAddr.withElementType(this->CGF->Int8Ty);
 529       this->CGF->Builder.CreateMemCpy(DstAddr, SrcAddr, SizeVal, false);
 530     } else {
 531       llvm::Type *Ty = llvm::Type::getIntNTy(
 532           this->CGF->getLLVMContext(),
 533           Size.getQuantity() * this->CGF->getContext().getCharWidth());
 534       DstAddr = DstAddr.withElementType(Ty);
 535       SrcAddr = SrcAddr.withElementType(Ty);
 536       llvm::Value *SrcVal = this->CGF->Builder.CreateLoad(SrcAddr, false);
 537       this->CGF->Builder.CreateStore(SrcVal, DstAddr, false);
 538     }
 539
 540     this->Start = this->End = CharUnits::Zero();
 541   }
 542
 543   template <class... Ts>
 544   void visitVolatileTrivial(QualType FT, const FieldDecl *FD, CharUnits Offset,
 545                             std::array<Address, 2> Addrs) {
 546     LValue DstLV, SrcLV;
 547     if (FD) {
 548       // No need to copy zero-length bit-fields.
 549       if (FD->isZeroLengthBitField(this->CGF->getContext()))
 550         return;
 551
 552       QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
 553       llvm::Type *Ty = this->CGF->ConvertType(RT);
 554       Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
 555       LValue DstBase =
 556           this->CGF->MakeAddrLValue(DstAddr.withElementType(Ty), FT);
 557       DstLV = this->CGF->EmitLValueForField(DstBase, FD);
 558       Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
 559       LValue SrcBase =
 560           this->CGF->MakeAddrLValue(SrcAddr.withElementType(Ty), FT);
 561       SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
 562     } else {
 563       llvm::Type *Ty = this->CGF->ConvertTypeForMem(FT);
 564       Address DstAddr = Addrs[DstIdx].withElementType(Ty);
 565       Address SrcAddr = Addrs[SrcIdx].withElementType(Ty);
 566       DstLV = this->CGF->MakeAddrLValue(DstAddr, FT);
 567       SrcLV = this->CGF->MakeAddrLValue(SrcAddr, FT);
 568     }
 569     RValue SrcVal = this->CGF->EmitLoadOfLValue(SrcLV, SourceLocation());
 570     this->CGF->EmitStoreThroughLValue(SrcVal, DstLV);
 571   }
 572 };
 573
 574 // These classes that emit the special functions for a non-trivial struct.
 575 struct GenDestructor : StructVisitor<GenDestructor>,
 576                        GenFuncBase<GenDestructor>,
 577                        DestructedTypeVisitor<GenDestructor> {
 578   using Super = DestructedTypeVisitor<GenDestructor>;
 579   GenDestructor(ASTContext &Ctx) : StructVisitor<GenDestructor>(Ctx) {}
 580
 581   void visitWithKind(QualType::DestructionKind DK, QualType FT,
 582                      const FieldDecl *FD, CharUnits CurStructOffset,
 583                      std::array<Address, 1> Addrs) {
 584     if (const auto *AT = getContext().getAsArrayType(FT)) {
 585       visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset, Addrs);
 586       return;
 587     }
 588
 589     Super::visitWithKind(DK, FT, FD, CurStructOffset, Addrs);
 590   }
 591
 592   void visitARCStrong(QualType QT, const FieldDecl *FD,
 593                       CharUnits CurStructOffset, std::array<Address, 1> Addrs) {
 594     CGF->destroyARCStrongImprecise(
 595         *CGF, getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
 596   }
 597
 598   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 599                     std::array<Address, 1> Addrs) {
 600     CGF->destroyARCWeak(
 601         *CGF, getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
 602   }
 603
 604   void callSpecialFunction(QualType FT, CharUnits Offset,
 605                            std::array<Address, 1> Addrs) {
 606     CGF->callCStructDestructor(
 607         CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
 608   }
 609 };
 610
 611 struct GenDefaultInitialize
 612     : StructVisitor<GenDefaultInitialize>,
 613       GenFuncBase<GenDefaultInitialize>,
 614       DefaultInitializedTypeVisitor<GenDefaultInitialize> {
 615   using Super = DefaultInitializedTypeVisitor<GenDefaultInitialize>;
 616   typedef GenFuncBase<GenDefaultInitialize> GenFuncBaseTy;
 617
 618   GenDefaultInitialize(ASTContext &Ctx)
 619       : StructVisitor<GenDefaultInitialize>(Ctx) {}
 620
 621   void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
 622                      const FieldDecl *FD, CharUnits CurStructOffset,
 623                      std::array<Address, 1> Addrs) {
 624     if (const auto *AT = getContext().getAsArrayType(FT)) {
 625       visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset,
 626                  Addrs);
 627       return;
 628     }
 629
 630     Super::visitWithKind(PDIK, FT, FD, CurStructOffset, Addrs);
 631   }
 632
 633   void visitARCStrong(QualType QT, const FieldDecl *FD,
 634                       CharUnits CurStructOffset, std::array<Address, 1> Addrs) {
 635     CGF->EmitNullInitialization(
 636         getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
 637   }
 638
 639   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 640                     std::array<Address, 1> Addrs) {
 641     CGF->EmitNullInitialization(
 642         getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
 643   }
 644
 645   template <class FieldKind, size_t... Is>
 646   void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
 647                   const FieldDecl *FD, CharUnits CurStructOffset,
 648                   std::array<Address, 1> Addrs) {
 649     if (!FK)
 650       return visitTrivial(QualType(AT, 0), FD, CurStructOffset, Addrs);
 651
 652     ASTContext &Ctx = getContext();
 653     CharUnits Size = Ctx.getTypeSizeInChars(QualType(AT, 0));
 654     QualType EltTy = Ctx.getBaseElementType(QualType(AT, 0));
 655
 656     if (Size < CharUnits::fromQuantity(16) || EltTy->getAs<RecordType>()) {
 657       GenFuncBaseTy::visitArray(FK, AT, IsVolatile, FD, CurStructOffset, Addrs);
 658       return;
 659     }
 660
 661     llvm::Constant *SizeVal = CGF->Builder.getInt64(Size.getQuantity());
 662     Address DstAddr = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 663     Address Loc = DstAddr.withElementType(CGF->Int8Ty);
 664     CGF->Builder.CreateMemSet(Loc, CGF->Builder.getInt8(0), SizeVal,
 665                               IsVolatile);
 666   }
 667
 668   void callSpecialFunction(QualType FT, CharUnits Offset,
 669                            std::array<Address, 1> Addrs) {
 670     CGF->callCStructDefaultConstructor(
 671         CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
 672   }
 673 };
 674
 675 struct GenCopyConstructor : GenBinaryFunc<GenCopyConstructor, false> {
 676   GenCopyConstructor(ASTContext &Ctx)
 677       : GenBinaryFunc<GenCopyConstructor, false>(Ctx) {}
 678
 679   void visitARCStrong(QualType QT, const FieldDecl *FD,
 680                       CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
 681     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 682     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 683     llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
 684         Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
 685     llvm::Value *Val = CGF->EmitARCRetain(QT, SrcVal);
 686     CGF->EmitStoreOfScalar(Val, CGF->MakeAddrLValue(Addrs[DstIdx], QT), true);
 687   }
 688
 689   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 690                     std::array<Address, 2> Addrs) {
 691     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 692     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 693     CGF->EmitARCCopyWeak(Addrs[DstIdx], Addrs[SrcIdx]);
 694   }
 695
 696   void callSpecialFunction(QualType FT, CharUnits Offset,
 697                            std::array<Address, 2> Addrs) {
 698     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
 699     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
 700     CGF->callCStructCopyConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
 701                                     CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
 702   }
 703 };
 704
 705 struct GenMoveConstructor : GenBinaryFunc<GenMoveConstructor, true> {
 706   GenMoveConstructor(ASTContext &Ctx)
 707       : GenBinaryFunc<GenMoveConstructor, true>(Ctx) {}
 708
 709   void visitARCStrong(QualType QT, const FieldDecl *FD,
 710                       CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
 711     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 712     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 713     LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
 714     llvm::Value *SrcVal =
 715         CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
 716     CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress(*CGF)), SrcLV);
 717     CGF->EmitStoreOfScalar(SrcVal, CGF->MakeAddrLValue(Addrs[DstIdx], QT),
 718                            /* isInitialization */ true);
 719   }
 720
 721   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 722                     std::array<Address, 2> Addrs) {
 723     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 724     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 725     CGF->EmitARCMoveWeak(Addrs[DstIdx], Addrs[SrcIdx]);
 726   }
 727
 728   void callSpecialFunction(QualType FT, CharUnits Offset,
 729                            std::array<Address, 2> Addrs) {
 730     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
 731     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
 732     CGF->callCStructMoveConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
 733                                     CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
 734   }
 735 };
 736
 737 struct GenCopyAssignment : GenBinaryFunc<GenCopyAssignment, false> {
 738   GenCopyAssignment(ASTContext &Ctx)
 739       : GenBinaryFunc<GenCopyAssignment, false>(Ctx) {}
 740
 741   void visitARCStrong(QualType QT, const FieldDecl *FD,
 742                       CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
 743     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 744     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 745     llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
 746         Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
 747     CGF->EmitARCStoreStrong(CGF->MakeAddrLValue(Addrs[DstIdx], QT), SrcVal,
 748                             false);
 749   }
 750
 751   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 752                     std::array<Address, 2> Addrs) {
 753     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 754     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 755     CGF->emitARCCopyAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
 756   }
 757
 758   void callSpecialFunction(QualType FT, CharUnits Offset,
 759                            std::array<Address, 2> Addrs) {
 760     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
 761     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
 762     CGF->callCStructCopyAssignmentOperator(
 763         CGF->MakeAddrLValue(Addrs[DstIdx], FT),
 764         CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
 765   }
 766 };
 767
 768 struct GenMoveAssignment : GenBinaryFunc<GenMoveAssignment, true> {
 769   GenMoveAssignment(ASTContext &Ctx)
 770       : GenBinaryFunc<GenMoveAssignment, true>(Ctx) {}
 771
 772   void visitARCStrong(QualType QT, const FieldDecl *FD,
 773                       CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
 774     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 775     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 776     LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
 777     llvm::Value *SrcVal =
 778         CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
 779     CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress(*CGF)), SrcLV);
 780     LValue DstLV = CGF->MakeAddrLValue(Addrs[DstIdx], QT);
 781     llvm::Value *DstVal =
 782         CGF->EmitLoadOfLValue(DstLV, SourceLocation()).getScalarVal();
 783     CGF->EmitStoreOfScalar(SrcVal, DstLV);
 784     CGF->EmitARCRelease(DstVal, ARCImpreciseLifetime);
 785   }
 786
 787   void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
 788                     std::array<Address, 2> Addrs) {
 789     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
 790     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
 791     CGF->emitARCMoveAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
 792   }
 793
 794   void callSpecialFunction(QualType FT, CharUnits Offset,
 795                            std::array<Address, 2> Addrs) {
 796     Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
 797     Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
 798     CGF->callCStructMoveAssignmentOperator(
 799         CGF->MakeAddrLValue(Addrs[DstIdx], FT),
 800         CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
 801   }
 802 };
 803
 804 } // namespace
 805
 806 void CodeGenFunction::destroyNonTrivialCStruct(CodeGenFunction &CGF,
 807                                                Address Addr, QualType Type) {
 808   CGF.callCStructDestructor(CGF.MakeAddrLValue(Addr, Type));
 809 }
 810
 811 // Default-initialize a variable that is a non-trivial struct or an array of
 812 // such structure.
 813 void CodeGenFunction::defaultInitNonTrivialCStructVar(LValue Dst) {
 814   GenDefaultInitialize Gen(getContext());
 815   Address DstPtr = Dst.getAddress(*this).withElementType(CGM.Int8PtrTy);
 816   Gen.setCGF(this);
 817   QualType QT = Dst.getType();
 818   QT = Dst.isVolatile() ? QT.withVolatile() : QT;
 819   Gen.visit(QT, nullptr, CharUnits::Zero(), std::array<Address, 1>({{DstPtr}}));
 820 }
 821
 822 template <class G, size_t N>
 823 static void callSpecialFunction(G &&Gen, StringRef FuncName, QualType QT,
 824                                 bool IsVolatile, CodeGenFunction &CGF,
 825                                 std::array<Address, N> Addrs) {
 826   auto SetArtificialLoc = ApplyDebugLocation::CreateArtificial(CGF);
 827   for (unsigned I = 0; I < N; ++I)
 828     Addrs[I] = Addrs[I].withElementType(CGF.CGM.Int8PtrTy);
 829   QT = IsVolatile ? QT.withVolatile() : QT;
 830   Gen.callFunc(FuncName, QT, Addrs, CGF);
 831 }
 832
 833 template <class G, size_t N>
 834 static llvm::Function *
 835 getSpecialFunction(G &&Gen, StringRef FuncName, QualType QT, bool IsVolatile,
 836                    std::array<CharUnits, N> Alignments, CodeGenModule &CGM) {
 837   QT = IsVolatile ? QT.withVolatile() : QT;
 838   // The following call requires an array of addresses as arguments, but doesn't
 839   // actually use them (it overwrites them with the addresses of the arguments
 840   // of the created function).
 841   return Gen.getFunction(FuncName, QT, Alignments, CGM);
 842 }
 843
 844 // Functions to emit calls to the special functions of a non-trivial C struct.
 845 void CodeGenFunction::callCStructDefaultConstructor(LValue Dst) {
 846   bool IsVolatile = Dst.isVolatile();
 847   Address DstPtr = Dst.getAddress(*this);
 848   QualType QT = Dst.getType();
 849   GenDefaultInitializeFuncName GenName(DstPtr.getAlignment(), getContext());
 850   std::string FuncName = GenName.getName(QT, IsVolatile);
 851   callSpecialFunction(GenDefaultInitialize(getContext()), FuncName, QT,
 852                       IsVolatile, *this, std::array<Address, 1>({{DstPtr}}));
 853 }
 854
 855 std::string CodeGenFunction::getNonTrivialCopyConstructorStr(
 856     QualType QT, CharUnits Alignment, bool IsVolatile, ASTContext &Ctx) {
 857   GenBinaryFuncName<false> GenName("", Alignment, Alignment, Ctx);
 858   return GenName.getName(QT, IsVolatile);
 859 }
 860
 861 std::string CodeGenFunction::getNonTrivialDestructorStr(QualType QT,
 862                                                         CharUnits Alignment,
 863                                                         bool IsVolatile,
 864                                                         ASTContext &Ctx) {
 865   GenDestructorFuncName GenName("", Alignment, Ctx);
 866   return GenName.getName(QT, IsVolatile);
 867 }
 868
 869 void CodeGenFunction::callCStructDestructor(LValue Dst) {
 870   bool IsVolatile = Dst.isVolatile();
 871   Address DstPtr = Dst.getAddress(*this);
 872   QualType QT = Dst.getType();
 873   GenDestructorFuncName GenName("__destructor_", DstPtr.getAlignment(),
 874                                 getContext());
 875   std::string FuncName = GenName.getName(QT, IsVolatile);
 876   callSpecialFunction(GenDestructor(getContext()), FuncName, QT, IsVolatile,
 877                       *this, std::array<Address, 1>({{DstPtr}}));
 878 }
 879
 880 void CodeGenFunction::callCStructCopyConstructor(LValue Dst, LValue Src) {
 881   bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
 882   Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
 883   QualType QT = Dst.getType();
 884   GenBinaryFuncName<false> GenName("__copy_constructor_", DstPtr.getAlignment(),
 885                                    SrcPtr.getAlignment(), getContext());
 886   std::string FuncName = GenName.getName(QT, IsVolatile);
 887   callSpecialFunction(GenCopyConstructor(getContext()), FuncName, QT,
 888                       IsVolatile, *this,
 889                       std::array<Address, 2>({{DstPtr, SrcPtr}}));
 890 }
 891
 892 void CodeGenFunction::callCStructCopyAssignmentOperator(LValue Dst, LValue Src
 893
 894 ) {
 895   bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
 896   Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
 897   QualType QT = Dst.getType();
 898   GenBinaryFuncName<false> GenName("__copy_assignment_", DstPtr.getAlignment(),
 899                                    SrcPtr.getAlignment(), getContext());
 900   std::string FuncName = GenName.getName(QT, IsVolatile);
 901   callSpecialFunction(GenCopyAssignment(getContext()), FuncName, QT, IsVolatile,
 902                       *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
 903 }
 904
 905 void CodeGenFunction::callCStructMoveConstructor(LValue Dst, LValue Src) {
 906   bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
 907   Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
 908   QualType QT = Dst.getType();
 909   GenBinaryFuncName<true> GenName("__move_constructor_", DstPtr.getAlignment(),
 910                                   SrcPtr.getAlignment(), getContext());
 911   std::string FuncName = GenName.getName(QT, IsVolatile);
 912   callSpecialFunction(GenMoveConstructor(getContext()), FuncName, QT,
 913                       IsVolatile, *this,
 914                       std::array<Address, 2>({{DstPtr, SrcPtr}}));
 915 }
 916
 917 void CodeGenFunction::callCStructMoveAssignmentOperator(LValue Dst, LValue Src
 918
 919 ) {
 920   bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
 921   Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
 922   QualType QT = Dst.getType();
 923   GenBinaryFuncName<true> GenName("__move_assignment_", DstPtr.getAlignment(),
 924                                   SrcPtr.getAlignment(), getContext());
 925   std::string FuncName = GenName.getName(QT, IsVolatile);
 926   callSpecialFunction(GenMoveAssignment(getContext()), FuncName, QT, IsVolatile,
 927                       *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
 928 }
 929
 930 llvm::Function *clang::CodeGen::getNonTrivialCStructDefaultConstructor(
 931     CodeGenModule &CGM, CharUnits DstAlignment, bool IsVolatile, QualType QT) {
 932   ASTContext &Ctx = CGM.getContext();
 933   GenDefaultInitializeFuncName GenName(DstAlignment, Ctx);
 934   std::string FuncName = GenName.getName(QT, IsVolatile);
 935   return getSpecialFunction(GenDefaultInitialize(Ctx), FuncName, QT, IsVolatile,
 936                             std::array<CharUnits, 1>({{DstAlignment}}), CGM);
 937 }
 938
 939 llvm::Function *clang::CodeGen::getNonTrivialCStructCopyConstructor(
 940     CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
 941     bool IsVolatile, QualType QT) {
 942   ASTContext &Ctx = CGM.getContext();
 943   GenBinaryFuncName<false> GenName("__copy_constructor_", DstAlignment,
 944                                    SrcAlignment, Ctx);
 945   std::string FuncName = GenName.getName(QT, IsVolatile);
 946   return getSpecialFunction(
 947       GenCopyConstructor(Ctx), FuncName, QT, IsVolatile,
 948       std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
 949 }
 950
 951 llvm::Function *clang::CodeGen::getNonTrivialCStructMoveConstructor(
 952     CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
 953     bool IsVolatile, QualType QT) {
 954   ASTContext &Ctx = CGM.getContext();
 955   GenBinaryFuncName<true> GenName("__move_constructor_", DstAlignment,
 956                                   SrcAlignment, Ctx);
 957   std::string FuncName = GenName.getName(QT, IsVolatile);
 958   return getSpecialFunction(
 959       GenMoveConstructor(Ctx), FuncName, QT, IsVolatile,
 960       std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
 961 }
 962
 963 llvm::Function *clang::CodeGen::getNonTrivialCStructCopyAssignmentOperator(
 964     CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
 965     bool IsVolatile, QualType QT) {
 966   ASTContext &Ctx = CGM.getContext();
 967   GenBinaryFuncName<false> GenName("__copy_assignment_", DstAlignment,
 968                                    SrcAlignment, Ctx);
 969   std::string FuncName = GenName.getName(QT, IsVolatile);
 970   return getSpecialFunction(
 971       GenCopyAssignment(Ctx), FuncName, QT, IsVolatile,
 972       std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
 973 }
 974
 975 llvm::Function *clang::CodeGen::getNonTrivialCStructMoveAssignmentOperator(
 976     CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
 977     bool IsVolatile, QualType QT) {
 978   ASTContext &Ctx = CGM.getContext();
 979   GenBinaryFuncName<true> GenName("__move_assignment_", DstAlignment,
 980                                   SrcAlignment, Ctx);
 981   std::string FuncName = GenName.getName(QT, IsVolatile);
 982   return getSpecialFunction(
 983       GenMoveAssignment(Ctx), FuncName, QT, IsVolatile,
 984       std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
 985 }
 986
 987 llvm::Function *clang::CodeGen::getNonTrivialCStructDestructor(
 988     CodeGenModule &CGM, CharUnits DstAlignment, bool IsVolatile, QualType QT) {
 989   ASTContext &Ctx = CGM.getContext();
 990   GenDestructorFuncName GenName("__destructor_", DstAlignment, Ctx);
 991   std::string FuncName = GenName.getName(QT, IsVolatile);
 992   return getSpecialFunction(GenDestructor(Ctx), FuncName, QT, IsVolatile,
 993                             std::array<CharUnits, 1>({{DstAlignment}}), CGM);
 994 }