1 //===--- CGNonTrivialStruct.cpp - Emit Special Functions for C Structs ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines functions to generate various special functions for C
13 //===----------------------------------------------------------------------===//
15 #include "CodeGenFunction.h"
16 #include "CodeGenModule.h"
17 #include "clang/AST/NonTrivialTypeVisitor.h"
18 #include "llvm/Support/ScopedPrinter.h"
21 using namespace clang;
22 using namespace CodeGen;
24 // Return the size of a field in number of bits.
25 static uint64_t getFieldSize(const FieldDecl *FD, QualType FT,
27 if (FD && FD->isBitField())
28 return FD->getBitWidthValue(Ctx);
29 return Ctx.getTypeSize(FT);
33 enum { DstIdx = 0, SrcIdx = 1 };
34 const char *ValNameStr[2] = {"dst", "src"};
36 template <class Derived> struct StructVisitor {
37 StructVisitor(ASTContext &Ctx) : Ctx(Ctx) {}
39 template <class... Ts>
40 void visitStructFields(QualType QT, CharUnits CurStructOffset, Ts... Args) {
41 const RecordDecl *RD = QT->castAs<RecordType>()->getDecl();
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...);
50 asDerived().flushTrivialFields(Args...);
53 template <class... Ts> void visitTrivial(Ts... Args) {}
55 template <class... Ts> void visitCXXDestructor(Ts... Args) {
56 llvm_unreachable("field of a C++ struct type is not expected");
59 template <class... Ts> void flushTrivialFields(Ts... Args) {}
61 uint64_t getFieldOffsetInBits(const FieldDecl *FD) {
62 return FD ? Ctx.getASTRecordLayout(FD->getParent())
63 .getFieldOffset(FD->getFieldIndex())
67 CharUnits getFieldOffset(const FieldDecl *FD) {
68 return Ctx.toCharUnitsFromBits(getFieldOffsetInBits(FD));
71 Derived &asDerived() { return static_cast<Derived &>(*this); }
73 ASTContext &getContext() { return Ctx; }
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>;
83 CopyStructVisitor(ASTContext &Ctx) : StructVisitor<Derived>(Ctx) {}
85 template <class... Ts>
86 void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
87 const FieldDecl *FD, CharUnits CurStructOffsset,
90 asDerived().flushTrivialFields(std::forward<Ts>(Args)...);
93 template <class... Ts>
94 void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
95 const FieldDecl *FD, CharUnits CurStructOffsset,
97 if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
98 asDerived().visitArray(PCK, AT, FT.isVolatileQualified(), FD,
99 CurStructOffsset, std::forward<Ts>(Args)...);
103 Super::visitWithKind(PCK, FT, FD, CurStructOffsset,
104 std::forward<Ts>(Args)...);
107 template <class... Ts>
108 void visitTrivial(QualType FT, const FieldDecl *FD, CharUnits CurStructOffset,
110 assert(!FT.isVolatileQualified() && "volatile field not expected");
111 ASTContext &Ctx = asDerived().getContext();
112 uint64_t FieldSize = getFieldSize(FD, FT, Ctx);
114 // Ignore zero-sized fields.
118 uint64_t FStartInBits = asDerived().getFieldOffsetInBits(FD);
119 uint64_t FEndInBits = FStartInBits + FieldSize;
120 uint64_t RoundedFEnd = llvm::alignTo(FEndInBits, Ctx.getCharWidth());
122 // Set Start if this is the first field of a sequence of trivial fields.
124 Start = CurStructOffset + Ctx.toCharUnitsFromBits(FStartInBits);
125 End = CurStructOffset + Ctx.toCharUnitsFromBits(RoundedFEnd);
128 CharUnits Start = CharUnits::Zero(), End = CharUnits::Zero();
131 // This function creates the mangled name of a special function of a non-trivial
132 // C struct. Since there is no ODR in C, the function is mangled based on the
133 // struct contents and not the name. The mangled name has the following
136 // <function-name> ::= <prefix> <alignment-info> "_" <struct-field-info>
137 // <prefix> ::= "__destructor_" | "__default_constructor_" |
138 // "__copy_constructor_" | "__move_constructor_" |
139 // "__copy_assignment_" | "__move_assignment_"
140 // <alignment-info> ::= <dst-alignment> ["_" <src-alignment>]
141 // <struct-field-info> ::= <field-info>+
142 // <field-info> ::= <struct-or-scalar-field-info> | <array-field-info>
143 // <struct-or-scalar-field-info> ::= <struct-field-info> | <strong-field-info> |
144 // <trivial-field-info>
145 // <array-field-info> ::= "_AB" <array-offset> "s" <element-size> "n"
146 // <num-elements> <innermost-element-info> "_AE"
147 // <innermost-element-info> ::= <struct-or-scalar-field-info>
148 // <strong-field-info> ::= "_s" ["b"] ["v"] <field-offset>
149 // <trivial-field-info> ::= "_t" ["v"] <field-offset> "_" <field-size>
151 template <class Derived> struct GenFuncNameBase {
152 std::string getVolatileOffsetStr(bool IsVolatile, CharUnits Offset) {
156 S += llvm::to_string(Offset.getQuantity());
160 void visitARCStrong(QualType FT, const FieldDecl *FD,
161 CharUnits CurStructOffset) {
163 if (FT->isBlockPointerType())
165 CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
166 appendStr(getVolatileOffsetStr(FT.isVolatileQualified(), FieldOffset));
169 void visitARCWeak(QualType FT, const FieldDecl *FD,
170 CharUnits CurStructOffset) {
172 CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
173 appendStr(getVolatileOffsetStr(FT.isVolatileQualified(), FieldOffset));
176 void visitStruct(QualType QT, const FieldDecl *FD,
177 CharUnits CurStructOffset) {
178 CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
179 asDerived().visitStructFields(QT, FieldOffset);
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.
188 return asDerived().visitTrivial(QualType(AT, 0), FD, CurStructOffset);
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);
205 void appendStr(StringRef Str) { Name += Str; }
207 std::string getName(QualType QT, bool IsVolatile) {
208 QT = IsVolatile ? QT.withVolatile() : QT;
209 asDerived().visitStructFields(QT, CharUnits::Zero());
213 Derived &asDerived() { return static_cast<Derived &>(*this); }
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()));
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));
233 template <bool IsMove>
234 struct GenBinaryFuncName : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>,
235 GenFuncNameBase<GenBinaryFuncName<IsMove>> {
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()));
245 void flushTrivialFields() {
246 if (this->Start == this->End)
249 this->appendStr("_t" + llvm::to_string(this->Start.getQuantity()) + "w" +
250 llvm::to_string((this->End - this->Start).getQuantity()));
252 this->Start = this->End = CharUnits::Zero();
255 void visitVolatileTrivial(QualType FT, const FieldDecl *FD,
256 CharUnits CurStackOffset) {
257 // Because volatile fields can be bit-fields and are individually copied,
258 // their offset and width are in bits.
259 uint64_t OffsetInBits =
260 this->Ctx.toBits(CurStackOffset) + this->getFieldOffsetInBits(FD);
261 this->appendStr("_tv" + llvm::to_string(OffsetInBits) + "w" +
262 llvm::to_string(getFieldSize(FD, FT, this->Ctx)));
266 struct GenDefaultInitializeFuncName
267 : GenUnaryFuncName<GenDefaultInitializeFuncName>,
268 DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName> {
269 using Super = DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName>;
270 GenDefaultInitializeFuncName(CharUnits DstAlignment, ASTContext &Ctx)
271 : GenUnaryFuncName<GenDefaultInitializeFuncName>("__default_constructor_",
272 DstAlignment, Ctx) {}
273 void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
274 const FieldDecl *FD, CharUnits CurStructOffset) {
275 if (const auto *AT = getContext().getAsArrayType(FT)) {
276 visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
280 Super::visitWithKind(PDIK, FT, FD, CurStructOffset);
284 struct GenDestructorFuncName : GenUnaryFuncName<GenDestructorFuncName>,
285 DestructedTypeVisitor<GenDestructorFuncName> {
286 using Super = DestructedTypeVisitor<GenDestructorFuncName>;
287 GenDestructorFuncName(const char *Prefix, CharUnits DstAlignment,
289 : GenUnaryFuncName<GenDestructorFuncName>(Prefix, DstAlignment,
291 void visitWithKind(QualType::DestructionKind DK, QualType FT,
292 const FieldDecl *FD, CharUnits CurStructOffset) {
293 if (const auto *AT = getContext().getAsArrayType(FT)) {
294 visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
298 Super::visitWithKind(DK, FT, FD, CurStructOffset);
302 // Helper function that creates CGFunctionInfo for an N-ary special function.
304 static const CGFunctionInfo &getFunctionInfo(CodeGenModule &CGM,
305 FunctionArgList &Args) {
306 ASTContext &Ctx = CGM.getContext();
307 llvm::SmallVector<ImplicitParamDecl *, N> Params;
308 QualType ParamTy = Ctx.getPointerType(Ctx.VoidPtrTy);
310 for (unsigned I = 0; I < N; ++I)
311 Params.push_back(ImplicitParamDecl::Create(
312 Ctx, nullptr, SourceLocation(), &Ctx.Idents.get(ValNameStr[I]), ParamTy,
313 ImplicitParamDecl::Other));
315 for (auto &P : Params)
318 return CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
321 // Template classes that are used as bases for classes that emit special
323 template <class Derived> struct GenFuncBase {
325 void visitStruct(QualType FT, const FieldDecl *FD, CharUnits CurStackOffset,
326 std::array<Address, N> Addrs) {
327 this->asDerived().callSpecialFunction(
328 FT, CurStackOffset + asDerived().getFieldOffset(FD), Addrs);
331 template <class FieldKind, size_t N>
332 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
333 const FieldDecl *FD, CharUnits CurStackOffset,
334 std::array<Address, N> Addrs) {
335 // Non-volatile trivial fields are copied when flushTrivialFields is called.
337 return asDerived().visitTrivial(QualType(AT, 0), FD, CurStackOffset,
340 asDerived().flushTrivialFields(Addrs);
341 CodeGenFunction &CGF = *this->CGF;
342 ASTContext &Ctx = CGF.getContext();
344 // Compute the end address.
346 std::array<Address, N> StartAddrs = Addrs;
347 for (unsigned I = 0; I < N; ++I)
348 StartAddrs[I] = getAddrWithOffset(Addrs[I], CurStackOffset, FD);
349 Address DstAddr = StartAddrs[DstIdx];
350 llvm::Value *NumElts = CGF.emitArrayLength(AT, BaseEltQT, DstAddr);
351 unsigned BaseEltSize = Ctx.getTypeSizeInChars(BaseEltQT).getQuantity();
352 llvm::Value *BaseEltSizeVal =
353 llvm::ConstantInt::get(NumElts->getType(), BaseEltSize);
354 llvm::Value *SizeInBytes =
355 CGF.Builder.CreateNUWMul(BaseEltSizeVal, NumElts);
356 Address BC = CGF.Builder.CreateBitCast(DstAddr, CGF.CGM.Int8PtrTy);
357 llvm::Value *DstArrayEnd =
358 CGF.Builder.CreateInBoundsGEP(BC.getPointer(), SizeInBytes);
359 DstArrayEnd = CGF.Builder.CreateBitCast(DstArrayEnd, CGF.CGM.Int8PtrPtrTy,
361 llvm::BasicBlock *PreheaderBB = CGF.Builder.GetInsertBlock();
363 // Create the header block and insert the phi instructions.
364 llvm::BasicBlock *HeaderBB = CGF.createBasicBlock("loop.header");
365 CGF.EmitBlock(HeaderBB);
366 llvm::PHINode *PHIs[N];
368 for (unsigned I = 0; I < N; ++I) {
369 PHIs[I] = CGF.Builder.CreatePHI(CGF.CGM.Int8PtrPtrTy, 2, "addr.cur");
370 PHIs[I]->addIncoming(StartAddrs[I].getPointer(), PreheaderBB);
373 // Create the exit and loop body blocks.
374 llvm::BasicBlock *ExitBB = CGF.createBasicBlock("loop.exit");
375 llvm::BasicBlock *LoopBB = CGF.createBasicBlock("loop.body");
377 // Emit the comparison and conditional branch instruction that jumps to
378 // either the exit or the loop body.
380 CGF.Builder.CreateICmpEQ(PHIs[DstIdx], DstArrayEnd, "done");
381 CGF.Builder.CreateCondBr(Done, ExitBB, LoopBB);
383 // Visit the element of the array in the loop body.
384 CGF.EmitBlock(LoopBB);
385 QualType EltQT = AT->getElementType();
386 CharUnits EltSize = Ctx.getTypeSizeInChars(EltQT);
387 std::array<Address, N> NewAddrs = Addrs;
389 for (unsigned I = 0; I < N; ++I)
390 NewAddrs[I] = Address(
391 PHIs[I], StartAddrs[I].getAlignment().alignmentAtOffset(EltSize));
393 EltQT = IsVolatile ? EltQT.withVolatile() : EltQT;
394 this->asDerived().visitWithKind(FK, EltQT, nullptr, CharUnits::Zero(),
397 LoopBB = CGF.Builder.GetInsertBlock();
399 for (unsigned I = 0; I < N; ++I) {
400 // Instrs to update the destination and source addresses.
401 // Update phi instructions.
402 NewAddrs[I] = getAddrWithOffset(NewAddrs[I], EltSize);
403 PHIs[I]->addIncoming(NewAddrs[I].getPointer(), LoopBB);
406 // Insert an unconditional branch to the header block.
407 CGF.Builder.CreateBr(HeaderBB);
408 CGF.EmitBlock(ExitBB);
411 /// Return an address with the specified offset from the passed address.
412 Address getAddrWithOffset(Address Addr, CharUnits Offset) {
413 assert(Addr.isValid() && "invalid address");
414 if (Offset.getQuantity() == 0)
416 Addr = CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrTy);
417 Addr = CGF->Builder.CreateConstInBoundsGEP(Addr, Offset.getQuantity(),
419 return CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrPtrTy);
422 Address getAddrWithOffset(Address Addr, CharUnits StructFieldOffset,
423 const FieldDecl *FD) {
424 return getAddrWithOffset(Addr, StructFieldOffset +
425 asDerived().getFieldOffset(FD));
430 getFunction(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
431 std::array<CharUnits, N> Alignments, CodeGenModule &CGM) {
432 // If the special function already exists in the module, return it.
433 if (llvm::Function *F = CGM.getModule().getFunction(FuncName)) {
434 bool WrongType = false;
435 if (!F->getReturnType()->isVoidTy())
438 for (const llvm::Argument &Arg : F->args())
439 if (Arg.getType() != CGM.Int8PtrPtrTy)
444 std::string FuncName = F->getName();
445 SourceLocation Loc = QT->castAs<RecordType>()->getDecl()->getLocation();
446 CGM.Error(Loc, "special function " + FuncName +
447 " for non-trivial C struct has incorrect type");
453 ASTContext &Ctx = CGM.getContext();
454 FunctionArgList Args;
455 const CGFunctionInfo &FI = getFunctionInfo<N>(CGM, Args);
456 llvm::FunctionType *FuncTy = CGM.getTypes().GetFunctionType(FI);
458 llvm::Function::Create(FuncTy, llvm::GlobalValue::LinkOnceODRLinkage,
459 FuncName, &CGM.getModule());
460 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
461 CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F);
462 CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
463 IdentifierInfo *II = &Ctx.Idents.get(FuncName);
464 FunctionDecl *FD = FunctionDecl::Create(
465 Ctx, Ctx.getTranslationUnitDecl(), SourceLocation(), SourceLocation(),
466 II, Ctx.getFunctionType(Ctx.VoidTy, llvm::None, {}), nullptr,
467 SC_PrivateExtern, false, false);
468 CodeGenFunction NewCGF(CGM);
470 CGF->StartFunction(FD, Ctx.VoidTy, F, FI, Args);
472 for (unsigned I = 0; I < N; ++I) {
473 llvm::Value *V = CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[I]));
474 Addrs[I] = Address(V, Alignments[I]);
477 asDerived().visitStructFields(QT, CharUnits::Zero(), Addrs);
478 CGF->FinishFunction();
483 void callFunc(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
484 CodeGenFunction &CallerCGF) {
485 std::array<CharUnits, N> Alignments;
486 llvm::Value *Ptrs[N];
488 for (unsigned I = 0; I < N; ++I) {
489 Alignments[I] = Addrs[I].getAlignment();
491 CallerCGF.Builder.CreateBitCast(Addrs[I], CallerCGF.CGM.Int8PtrPtrTy)
495 if (llvm::Function *F =
496 getFunction(FuncName, QT, Addrs, Alignments, CallerCGF.CGM))
497 CallerCGF.EmitNounwindRuntimeCall(F, Ptrs);
500 Derived &asDerived() { return static_cast<Derived &>(*this); }
502 void setCGF(CodeGenFunction *F) { CGF = F; }
504 CodeGenFunction *CGF = nullptr;
507 template <class Derived, bool IsMove>
508 struct GenBinaryFunc : CopyStructVisitor<Derived, IsMove>,
509 GenFuncBase<Derived> {
510 GenBinaryFunc(ASTContext &Ctx) : CopyStructVisitor<Derived, IsMove>(Ctx) {}
512 void flushTrivialFields(std::array<Address, 2> Addrs) {
513 CharUnits Size = this->End - this->Start;
515 if (Size.getQuantity() == 0)
518 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], this->Start);
519 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], this->Start);
522 if (Size.getQuantity() >= 16 || !llvm::isPowerOf2_32(Size.getQuantity())) {
523 llvm::Value *SizeVal =
524 llvm::ConstantInt::get(this->CGF->SizeTy, Size.getQuantity());
526 this->CGF->Builder.CreateElementBitCast(DstAddr, this->CGF->Int8Ty);
528 this->CGF->Builder.CreateElementBitCast(SrcAddr, this->CGF->Int8Ty);
529 this->CGF->Builder.CreateMemCpy(DstAddr, SrcAddr, SizeVal, false);
531 llvm::Type *Ty = llvm::Type::getIntNTy(
532 this->CGF->getLLVMContext(),
533 Size.getQuantity() * this->CGF->getContext().getCharWidth());
534 DstAddr = this->CGF->Builder.CreateElementBitCast(DstAddr, Ty);
535 SrcAddr = this->CGF->Builder.CreateElementBitCast(SrcAddr, Ty);
536 llvm::Value *SrcVal = this->CGF->Builder.CreateLoad(SrcAddr, false);
537 this->CGF->Builder.CreateStore(SrcVal, DstAddr, false);
540 this->Start = this->End = CharUnits::Zero();
543 template <class... Ts>
544 void visitVolatileTrivial(QualType FT, const FieldDecl *FD, CharUnits Offset,
545 std::array<Address, 2> Addrs) {
548 QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
549 llvm::PointerType *PtrTy = this->CGF->ConvertType(RT)->getPointerTo();
550 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
551 LValue DstBase = this->CGF->MakeAddrLValue(
552 this->CGF->Builder.CreateBitCast(DstAddr, PtrTy), FT);
553 DstLV = this->CGF->EmitLValueForField(DstBase, FD);
554 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
555 LValue SrcBase = this->CGF->MakeAddrLValue(
556 this->CGF->Builder.CreateBitCast(SrcAddr, PtrTy), FT);
557 SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
559 llvm::PointerType *Ty = this->CGF->ConvertType(FT)->getPointerTo();
560 Address DstAddr = this->CGF->Builder.CreateBitCast(Addrs[DstIdx], Ty);
561 Address SrcAddr = this->CGF->Builder.CreateBitCast(Addrs[SrcIdx], Ty);
562 DstLV = this->CGF->MakeAddrLValue(DstAddr, FT);
563 SrcLV = this->CGF->MakeAddrLValue(SrcAddr, FT);
565 RValue SrcVal = this->CGF->EmitLoadOfLValue(SrcLV, SourceLocation());
566 this->CGF->EmitStoreThroughLValue(SrcVal, DstLV);
570 // These classes that emit the special functions for a non-trivial struct.
571 struct GenDestructor : StructVisitor<GenDestructor>,
572 GenFuncBase<GenDestructor>,
573 DestructedTypeVisitor<GenDestructor> {
574 using Super = DestructedTypeVisitor<GenDestructor>;
575 GenDestructor(ASTContext &Ctx) : StructVisitor<GenDestructor>(Ctx) {}
577 void visitWithKind(QualType::DestructionKind DK, QualType FT,
578 const FieldDecl *FD, CharUnits CurStructOffset,
579 std::array<Address, 1> Addrs) {
580 if (const auto *AT = getContext().getAsArrayType(FT)) {
581 visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset, Addrs);
585 Super::visitWithKind(DK, FT, FD, CurStructOffset, Addrs);
588 void visitARCStrong(QualType QT, const FieldDecl *FD,
589 CharUnits CurStackOffset, std::array<Address, 1> Addrs) {
590 CGF->destroyARCStrongImprecise(
591 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
594 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
595 std::array<Address, 1> Addrs) {
597 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
600 void callSpecialFunction(QualType FT, CharUnits Offset,
601 std::array<Address, 1> Addrs) {
602 CGF->callCStructDestructor(
603 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
607 struct GenDefaultInitialize
608 : StructVisitor<GenDefaultInitialize>,
609 GenFuncBase<GenDefaultInitialize>,
610 DefaultInitializedTypeVisitor<GenDefaultInitialize> {
611 using Super = DefaultInitializedTypeVisitor<GenDefaultInitialize>;
612 typedef GenFuncBase<GenDefaultInitialize> GenFuncBaseTy;
614 GenDefaultInitialize(ASTContext &Ctx)
615 : StructVisitor<GenDefaultInitialize>(Ctx) {}
617 void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
618 const FieldDecl *FD, CharUnits CurStructOffset,
619 std::array<Address, 1> Addrs) {
620 if (const auto *AT = getContext().getAsArrayType(FT)) {
621 visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset,
626 Super::visitWithKind(PDIK, FT, FD, CurStructOffset, Addrs);
629 void visitARCStrong(QualType QT, const FieldDecl *FD,
630 CharUnits CurStackOffset, std::array<Address, 1> Addrs) {
631 CGF->EmitNullInitialization(
632 getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
635 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
636 std::array<Address, 1> Addrs) {
637 CGF->EmitNullInitialization(
638 getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
641 template <class FieldKind, size_t... Is>
642 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
643 const FieldDecl *FD, CharUnits CurStackOffset,
644 std::array<Address, 1> Addrs) {
646 return visitTrivial(QualType(AT, 0), FD, CurStackOffset, Addrs);
648 ASTContext &Ctx = getContext();
649 CharUnits Size = Ctx.getTypeSizeInChars(QualType(AT, 0));
650 QualType EltTy = Ctx.getBaseElementType(QualType(AT, 0));
652 if (Size < CharUnits::fromQuantity(16) || EltTy->getAs<RecordType>()) {
653 GenFuncBaseTy::visitArray(FK, AT, IsVolatile, FD, CurStackOffset, Addrs);
657 llvm::Constant *SizeVal = CGF->Builder.getInt64(Size.getQuantity());
658 Address DstAddr = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
659 Address Loc = CGF->Builder.CreateElementBitCast(DstAddr, CGF->Int8Ty);
660 CGF->Builder.CreateMemSet(Loc, CGF->Builder.getInt8(0), SizeVal,
664 void callSpecialFunction(QualType FT, CharUnits Offset,
665 std::array<Address, 1> Addrs) {
666 CGF->callCStructDefaultConstructor(
667 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
671 struct GenCopyConstructor : GenBinaryFunc<GenCopyConstructor, false> {
672 GenCopyConstructor(ASTContext &Ctx)
673 : GenBinaryFunc<GenCopyConstructor, false>(Ctx) {}
675 void visitARCStrong(QualType QT, const FieldDecl *FD,
676 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
677 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
678 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
679 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
680 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
681 llvm::Value *Val = CGF->EmitARCRetain(QT, SrcVal);
682 CGF->EmitStoreOfScalar(Val, CGF->MakeAddrLValue(Addrs[DstIdx], QT), true);
685 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
686 std::array<Address, 2> Addrs) {
687 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
688 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
689 CGF->EmitARCCopyWeak(Addrs[DstIdx], Addrs[SrcIdx]);
692 void callSpecialFunction(QualType FT, CharUnits Offset,
693 std::array<Address, 2> Addrs) {
694 CGF->callCStructCopyConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
695 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
699 struct GenMoveConstructor : GenBinaryFunc<GenMoveConstructor, true> {
700 GenMoveConstructor(ASTContext &Ctx)
701 : GenBinaryFunc<GenMoveConstructor, true>(Ctx) {}
703 void visitARCStrong(QualType QT, const FieldDecl *FD,
704 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
705 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
706 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
707 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
708 llvm::Value *SrcVal =
709 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
710 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress()), SrcLV);
711 CGF->EmitStoreOfScalar(SrcVal, CGF->MakeAddrLValue(Addrs[DstIdx], QT),
712 /* isInitialization */ true);
715 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
716 std::array<Address, 2> Addrs) {
717 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
718 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
719 CGF->EmitARCMoveWeak(Addrs[DstIdx], Addrs[SrcIdx]);
722 void callSpecialFunction(QualType FT, CharUnits Offset,
723 std::array<Address, 2> Addrs) {
724 CGF->callCStructMoveConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
725 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
729 struct GenCopyAssignment : GenBinaryFunc<GenCopyAssignment, false> {
730 GenCopyAssignment(ASTContext &Ctx)
731 : GenBinaryFunc<GenCopyAssignment, false>(Ctx) {}
733 void visitARCStrong(QualType QT, const FieldDecl *FD,
734 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
735 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
736 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
737 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
738 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
739 CGF->EmitARCStoreStrong(CGF->MakeAddrLValue(Addrs[DstIdx], QT), SrcVal,
743 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
744 std::array<Address, 2> Addrs) {
745 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
746 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
747 CGF->emitARCCopyAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
750 void callSpecialFunction(QualType FT, CharUnits Offset,
751 std::array<Address, 2> Addrs) {
752 CGF->callCStructCopyAssignmentOperator(
753 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
754 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
758 struct GenMoveAssignment : GenBinaryFunc<GenMoveAssignment, true> {
759 GenMoveAssignment(ASTContext &Ctx)
760 : GenBinaryFunc<GenMoveAssignment, true>(Ctx) {}
762 void visitARCStrong(QualType QT, const FieldDecl *FD,
763 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
764 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
765 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
766 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
767 llvm::Value *SrcVal =
768 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
769 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress()), SrcLV);
770 LValue DstLV = CGF->MakeAddrLValue(Addrs[DstIdx], QT);
771 llvm::Value *DstVal =
772 CGF->EmitLoadOfLValue(DstLV, SourceLocation()).getScalarVal();
773 CGF->EmitStoreOfScalar(SrcVal, DstLV);
774 CGF->EmitARCRelease(DstVal, ARCImpreciseLifetime);
777 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
778 std::array<Address, 2> Addrs) {
779 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
780 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
781 CGF->emitARCMoveAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
784 void callSpecialFunction(QualType FT, CharUnits Offset,
785 std::array<Address, 2> Addrs) {
786 CGF->callCStructMoveAssignmentOperator(
787 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
788 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
794 void CodeGenFunction::destroyNonTrivialCStruct(CodeGenFunction &CGF,
795 Address Addr, QualType Type) {
796 CGF.callCStructDestructor(CGF.MakeAddrLValue(Addr, Type));
799 // Default-initialize a variable that is a non-trivial struct or an array of
801 void CodeGenFunction::defaultInitNonTrivialCStructVar(LValue Dst) {
802 GenDefaultInitialize Gen(getContext());
803 Address DstPtr = Builder.CreateBitCast(Dst.getAddress(), CGM.Int8PtrPtrTy);
805 QualType QT = Dst.getType();
806 QT = Dst.isVolatile() ? QT.withVolatile() : QT;
807 Gen.visit(QT, nullptr, CharUnits::Zero(), std::array<Address, 1>({{DstPtr}}));
810 template <class G, size_t N>
811 static void callSpecialFunction(G &&Gen, StringRef FuncName, QualType QT,
812 bool IsVolatile, CodeGenFunction &CGF,
813 std::array<Address, N> Addrs) {
814 for (unsigned I = 0; I < N; ++I)
815 Addrs[I] = CGF.Builder.CreateBitCast(Addrs[I], CGF.CGM.Int8PtrPtrTy);
816 QT = IsVolatile ? QT.withVolatile() : QT;
817 Gen.callFunc(FuncName, QT, Addrs, CGF);
820 // Functions to emit calls to the special functions of a non-trivial C struct.
821 void CodeGenFunction::callCStructDefaultConstructor(LValue Dst) {
822 bool IsVolatile = Dst.isVolatile();
823 Address DstPtr = Dst.getAddress();
824 QualType QT = Dst.getType();
825 GenDefaultInitializeFuncName GenName(DstPtr.getAlignment(), getContext());
826 std::string FuncName = GenName.getName(QT, IsVolatile);
827 callSpecialFunction(GenDefaultInitialize(getContext()), FuncName, QT,
828 IsVolatile, *this, std::array<Address, 1>({{DstPtr}}));
832 CodeGenFunction::getNonTrivialCopyConstructorStr(QualType QT,
836 GenBinaryFuncName<false> GenName("", Alignment, Alignment, Ctx);
837 return GenName.getName(QT, IsVolatile);
841 CodeGenFunction::getNonTrivialDestructorStr(QualType QT, CharUnits Alignment,
842 bool IsVolatile, ASTContext &Ctx) {
843 GenDestructorFuncName GenName("", Alignment, Ctx);
844 return GenName.getName(QT, IsVolatile);
847 void CodeGenFunction::callCStructDestructor(LValue Dst) {
848 bool IsVolatile = Dst.isVolatile();
849 Address DstPtr = Dst.getAddress();
850 QualType QT = Dst.getType();
851 GenDestructorFuncName GenName("__destructor_", DstPtr.getAlignment(),
853 std::string FuncName = GenName.getName(QT, IsVolatile);
854 callSpecialFunction(GenDestructor(getContext()), FuncName, QT, IsVolatile,
855 *this, std::array<Address, 1>({{DstPtr}}));
858 void CodeGenFunction::callCStructCopyConstructor(LValue Dst, LValue Src) {
859 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
860 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
861 QualType QT = Dst.getType();
862 GenBinaryFuncName<false> GenName("__copy_constructor_", DstPtr.getAlignment(),
863 SrcPtr.getAlignment(), getContext());
864 std::string FuncName = GenName.getName(QT, IsVolatile);
865 callSpecialFunction(GenCopyConstructor(getContext()), FuncName, QT,
867 std::array<Address, 2>({{DstPtr, SrcPtr}}));
870 void CodeGenFunction::callCStructCopyAssignmentOperator(LValue Dst, LValue Src
873 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
874 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
875 QualType QT = Dst.getType();
876 GenBinaryFuncName<false> GenName("__copy_assignment_", DstPtr.getAlignment(),
877 SrcPtr.getAlignment(), getContext());
878 std::string FuncName = GenName.getName(QT, IsVolatile);
879 callSpecialFunction(GenCopyAssignment(getContext()), FuncName, QT, IsVolatile,
880 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
883 void CodeGenFunction::callCStructMoveConstructor(LValue Dst, LValue Src) {
884 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
885 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
886 QualType QT = Dst.getType();
887 GenBinaryFuncName<true> GenName("__move_constructor_", DstPtr.getAlignment(),
888 SrcPtr.getAlignment(), getContext());
889 std::string FuncName = GenName.getName(QT, IsVolatile);
890 callSpecialFunction(GenMoveConstructor(getContext()), FuncName, QT,
892 std::array<Address, 2>({{DstPtr, SrcPtr}}));
895 void CodeGenFunction::callCStructMoveAssignmentOperator(LValue Dst, LValue Src
898 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
899 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
900 QualType QT = Dst.getType();
901 GenBinaryFuncName<true> GenName("__move_assignment_", DstPtr.getAlignment(),
902 SrcPtr.getAlignment(), getContext());
903 std::string FuncName = GenName.getName(QT, IsVolatile);
904 callSpecialFunction(GenMoveAssignment(getContext()), FuncName, QT, IsVolatile,
905 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));