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 CharUnits FieldOffset = CurStructOffset + asDerived().getFieldOffset(FD);
191 ASTContext &Ctx = asDerived().getContext();
192 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
193 unsigned NumElts = Ctx.getConstantArrayElementCount(CAT);
194 QualType EltTy = Ctx.getBaseElementType(CAT);
195 CharUnits EltSize = Ctx.getTypeSizeInChars(EltTy);
196 appendStr("_AB" + llvm::to_string(FieldOffset.getQuantity()) + "s" +
197 llvm::to_string(EltSize.getQuantity()) + "n" +
198 llvm::to_string(NumElts));
199 EltTy = IsVolatile ? EltTy.withVolatile() : EltTy;
200 asDerived().visitWithKind(FK, EltTy, nullptr, FieldOffset);
204 void appendStr(StringRef Str) { Name += Str; }
206 std::string getName(QualType QT, bool IsVolatile) {
207 QT = IsVolatile ? QT.withVolatile() : QT;
208 asDerived().visitStructFields(QT, CharUnits::Zero());
212 Derived &asDerived() { return static_cast<Derived &>(*this); }
217 template <class Derived>
218 struct GenUnaryFuncName : StructVisitor<Derived>, GenFuncNameBase<Derived> {
219 GenUnaryFuncName(StringRef Prefix, CharUnits DstAlignment, ASTContext &Ctx)
220 : StructVisitor<Derived>(Ctx) {
221 this->appendStr(Prefix);
222 this->appendStr(llvm::to_string(DstAlignment.getQuantity()));
226 // Helper function to create a null constant.
227 static llvm::Constant *getNullForVariable(Address Addr) {
228 llvm::Type *Ty = Addr.getElementType();
229 return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(Ty));
232 template <bool IsMove>
233 struct GenBinaryFuncName : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>,
234 GenFuncNameBase<GenBinaryFuncName<IsMove>> {
236 GenBinaryFuncName(StringRef Prefix, CharUnits DstAlignment,
237 CharUnits SrcAlignment, ASTContext &Ctx)
238 : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>(Ctx) {
239 this->appendStr(Prefix);
240 this->appendStr(llvm::to_string(DstAlignment.getQuantity()));
241 this->appendStr("_" + llvm::to_string(SrcAlignment.getQuantity()));
244 void flushTrivialFields() {
245 if (this->Start == this->End)
248 this->appendStr("_t" + llvm::to_string(this->Start.getQuantity()) + "w" +
249 llvm::to_string((this->End - this->Start).getQuantity()));
251 this->Start = this->End = CharUnits::Zero();
254 void visitVolatileTrivial(QualType FT, const FieldDecl *FD,
255 CharUnits CurStackOffset) {
256 // Because volatile fields can be bit-fields and are individually copied,
257 // their offset and width are in bits.
258 uint64_t OffsetInBits =
259 this->Ctx.toBits(CurStackOffset) + this->getFieldOffsetInBits(FD);
260 this->appendStr("_tv" + llvm::to_string(OffsetInBits) + "w" +
261 llvm::to_string(getFieldSize(FD, FT, this->Ctx)));
265 struct GenDefaultInitializeFuncName
266 : GenUnaryFuncName<GenDefaultInitializeFuncName>,
267 DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName> {
268 using Super = DefaultInitializedTypeVisitor<GenDefaultInitializeFuncName>;
269 GenDefaultInitializeFuncName(CharUnits DstAlignment, ASTContext &Ctx)
270 : GenUnaryFuncName<GenDefaultInitializeFuncName>("__default_constructor_",
271 DstAlignment, Ctx) {}
272 void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
273 const FieldDecl *FD, CharUnits CurStructOffset) {
274 if (const auto *AT = getContext().getAsArrayType(FT)) {
275 visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
279 Super::visitWithKind(PDIK, FT, FD, CurStructOffset);
283 struct GenDestructorFuncName : GenUnaryFuncName<GenDestructorFuncName>,
284 DestructedTypeVisitor<GenDestructorFuncName> {
285 using Super = DestructedTypeVisitor<GenDestructorFuncName>;
286 GenDestructorFuncName(CharUnits DstAlignment, ASTContext &Ctx)
287 : GenUnaryFuncName<GenDestructorFuncName>("__destructor_", DstAlignment,
289 void visitWithKind(QualType::DestructionKind DK, QualType FT,
290 const FieldDecl *FD, CharUnits CurStructOffset) {
291 if (const auto *AT = getContext().getAsArrayType(FT)) {
292 visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset);
296 Super::visitWithKind(DK, FT, FD, CurStructOffset);
300 // Helper function that creates CGFunctionInfo for an N-ary special function.
302 static const CGFunctionInfo &getFunctionInfo(CodeGenModule &CGM,
303 FunctionArgList &Args) {
304 ASTContext &Ctx = CGM.getContext();
305 llvm::SmallVector<ImplicitParamDecl *, N> Params;
306 QualType ParamTy = Ctx.getPointerType(Ctx.VoidPtrTy);
308 for (unsigned I = 0; I < N; ++I)
309 Params.push_back(ImplicitParamDecl::Create(
310 Ctx, nullptr, SourceLocation(), &Ctx.Idents.get(ValNameStr[I]), ParamTy,
311 ImplicitParamDecl::Other));
313 for (auto &P : Params)
316 return CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
319 // Template classes that are used as bases for classes that emit special
321 template <class Derived> struct GenFuncBase {
323 void visitStruct(QualType FT, const FieldDecl *FD, CharUnits CurStackOffset,
324 std::array<Address, N> Addrs) {
325 this->asDerived().callSpecialFunction(
326 FT, CurStackOffset + asDerived().getFieldOffset(FD), Addrs);
329 template <class FieldKind, size_t N>
330 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
331 const FieldDecl *FD, CharUnits CurStackOffset,
332 std::array<Address, N> Addrs) {
333 // Non-volatile trivial fields are copied when flushTrivialFields is called.
335 return asDerived().visitTrivial(QualType(AT, 0), FD, CurStackOffset,
338 CodeGenFunction &CGF = *this->CGF;
339 ASTContext &Ctx = CGF.getContext();
341 // Compute the end address.
343 std::array<Address, N> StartAddrs = Addrs;
344 for (unsigned I = 0; I < N; ++I)
345 StartAddrs[I] = getAddrWithOffset(Addrs[I], CurStackOffset, FD);
346 Address DstAddr = StartAddrs[DstIdx];
347 llvm::Value *NumElts = CGF.emitArrayLength(AT, BaseEltQT, DstAddr);
348 unsigned BaseEltSize = Ctx.getTypeSizeInChars(BaseEltQT).getQuantity();
349 llvm::Value *BaseEltSizeVal =
350 llvm::ConstantInt::get(NumElts->getType(), BaseEltSize);
351 llvm::Value *SizeInBytes =
352 CGF.Builder.CreateNUWMul(BaseEltSizeVal, NumElts);
353 Address BC = CGF.Builder.CreateBitCast(DstAddr, CGF.CGM.Int8PtrTy);
354 llvm::Value *DstArrayEnd =
355 CGF.Builder.CreateInBoundsGEP(BC.getPointer(), SizeInBytes);
356 DstArrayEnd = CGF.Builder.CreateBitCast(DstArrayEnd, CGF.CGM.Int8PtrPtrTy,
358 llvm::BasicBlock *PreheaderBB = CGF.Builder.GetInsertBlock();
360 // Create the header block and insert the phi instructions.
361 llvm::BasicBlock *HeaderBB = CGF.createBasicBlock("loop.header");
362 CGF.EmitBlock(HeaderBB);
363 llvm::PHINode *PHIs[N];
365 for (unsigned I = 0; I < N; ++I) {
366 PHIs[I] = CGF.Builder.CreatePHI(CGF.CGM.Int8PtrPtrTy, 2, "addr.cur");
367 PHIs[I]->addIncoming(StartAddrs[I].getPointer(), PreheaderBB);
370 // Create the exit and loop body blocks.
371 llvm::BasicBlock *ExitBB = CGF.createBasicBlock("loop.exit");
372 llvm::BasicBlock *LoopBB = CGF.createBasicBlock("loop.body");
374 // Emit the comparison and conditional branch instruction that jumps to
375 // either the exit or the loop body.
377 CGF.Builder.CreateICmpEQ(PHIs[DstIdx], DstArrayEnd, "done");
378 CGF.Builder.CreateCondBr(Done, ExitBB, LoopBB);
380 // Visit the element of the array in the loop body.
381 CGF.EmitBlock(LoopBB);
382 QualType EltQT = AT->getElementType();
383 CharUnits EltSize = Ctx.getTypeSizeInChars(EltQT);
384 std::array<Address, N> NewAddrs = Addrs;
386 for (unsigned I = 0; I < N; ++I)
387 NewAddrs[I] = Address(
388 PHIs[I], StartAddrs[I].getAlignment().alignmentAtOffset(EltSize));
390 EltQT = IsVolatile ? EltQT.withVolatile() : EltQT;
391 this->asDerived().visitWithKind(FK, EltQT, nullptr, CharUnits::Zero(),
394 LoopBB = CGF.Builder.GetInsertBlock();
396 for (unsigned I = 0; I < N; ++I) {
397 // Instrs to update the destination and source addresses.
398 // Update phi instructions.
399 NewAddrs[I] = getAddrWithOffset(NewAddrs[I], EltSize);
400 PHIs[I]->addIncoming(NewAddrs[I].getPointer(), LoopBB);
403 // Insert an unconditional branch to the header block.
404 CGF.Builder.CreateBr(HeaderBB);
405 CGF.EmitBlock(ExitBB);
408 /// Return an address with the specified offset from the passed address.
409 Address getAddrWithOffset(Address Addr, CharUnits Offset) {
410 assert(Addr.isValid() && "invalid address");
411 if (Offset.getQuantity() == 0)
413 Addr = CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrTy);
414 Addr = CGF->Builder.CreateConstInBoundsGEP(Addr, Offset.getQuantity(),
416 return CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrPtrTy);
419 Address getAddrWithOffset(Address Addr, CharUnits StructFieldOffset,
420 const FieldDecl *FD) {
421 return getAddrWithOffset(Addr, StructFieldOffset +
422 asDerived().getFieldOffset(FD));
427 getFunction(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
428 std::array<CharUnits, N> Alignments, CodeGenModule &CGM) {
429 // If the special function already exists in the module, return it.
430 if (llvm::Function *F = CGM.getModule().getFunction(FuncName)) {
431 bool WrongType = false;
432 if (!F->getReturnType()->isVoidTy())
435 for (const llvm::Argument &Arg : F->args())
436 if (Arg.getType() != CGM.Int8PtrPtrTy)
441 std::string FuncName = F->getName();
442 SourceLocation Loc = QT->castAs<RecordType>()->getDecl()->getLocation();
443 CGM.Error(Loc, "special function " + FuncName +
444 " for non-trivial C struct has incorrect type");
450 ASTContext &Ctx = CGM.getContext();
451 FunctionArgList Args;
452 const CGFunctionInfo &FI = getFunctionInfo<N>(CGM, Args);
453 llvm::FunctionType *FuncTy = CGM.getTypes().GetFunctionType(FI);
455 llvm::Function::Create(FuncTy, llvm::GlobalValue::LinkOnceODRLinkage,
456 FuncName, &CGM.getModule());
457 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
458 CGM.SetLLVMFunctionAttributes(nullptr, FI, F);
459 CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
460 IdentifierInfo *II = &Ctx.Idents.get(FuncName);
461 FunctionDecl *FD = FunctionDecl::Create(
462 Ctx, Ctx.getTranslationUnitDecl(), SourceLocation(), SourceLocation(),
463 II, Ctx.VoidTy, nullptr, SC_PrivateExtern, false, false);
464 CodeGenFunction NewCGF(CGM);
466 CGF->StartFunction(FD, Ctx.VoidTy, F, FI, Args);
468 for (unsigned I = 0; I < N; ++I) {
469 llvm::Value *V = CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[I]));
470 Addrs[I] = Address(V, Alignments[I]);
473 asDerived().visitStructFields(QT, CharUnits::Zero(), Addrs);
474 CGF->FinishFunction();
479 void callFunc(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
480 CodeGenFunction &CallerCGF) {
481 std::array<CharUnits, N> Alignments;
482 llvm::Value *Ptrs[N];
484 for (unsigned I = 0; I < N; ++I) {
485 Alignments[I] = Addrs[I].getAlignment();
487 CallerCGF.Builder.CreateBitCast(Addrs[I], CallerCGF.CGM.Int8PtrPtrTy)
491 if (llvm::Function *F =
492 getFunction(FuncName, QT, Addrs, Alignments, CallerCGF.CGM))
493 CallerCGF.EmitNounwindRuntimeCall(F, Ptrs);
496 Derived &asDerived() { return static_cast<Derived &>(*this); }
498 void setCGF(CodeGenFunction *F) { CGF = F; }
500 CodeGenFunction *CGF = nullptr;
503 template <class Derived, bool IsMove>
504 struct GenBinaryFunc : CopyStructVisitor<Derived, IsMove>,
505 GenFuncBase<Derived> {
506 GenBinaryFunc(ASTContext &Ctx) : CopyStructVisitor<Derived, IsMove>(Ctx) {}
508 void flushTrivialFields(std::array<Address, 2> Addrs) {
509 CharUnits Size = this->End - this->Start;
511 if (Size.getQuantity() == 0)
514 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], this->Start);
515 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], this->Start);
518 if (Size.getQuantity() >= 16 || !llvm::isPowerOf2_32(Size.getQuantity())) {
519 llvm::Value *SizeVal =
520 llvm::ConstantInt::get(this->CGF->SizeTy, Size.getQuantity());
522 this->CGF->Builder.CreateElementBitCast(DstAddr, this->CGF->Int8Ty);
524 this->CGF->Builder.CreateElementBitCast(SrcAddr, this->CGF->Int8Ty);
525 this->CGF->Builder.CreateMemCpy(DstAddr, SrcAddr, SizeVal, false);
527 llvm::Type *Ty = llvm::Type::getIntNTy(
528 this->CGF->getLLVMContext(),
529 Size.getQuantity() * this->CGF->getContext().getCharWidth());
530 DstAddr = this->CGF->Builder.CreateElementBitCast(DstAddr, Ty);
531 SrcAddr = this->CGF->Builder.CreateElementBitCast(SrcAddr, Ty);
532 llvm::Value *SrcVal = this->CGF->Builder.CreateLoad(SrcAddr, false);
533 this->CGF->Builder.CreateStore(SrcVal, DstAddr, false);
536 this->Start = this->End = CharUnits::Zero();
539 template <class... Ts>
540 void visitVolatileTrivial(QualType FT, const FieldDecl *FD, CharUnits Offset,
541 std::array<Address, 2> Addrs) {
544 QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
545 llvm::PointerType *PtrTy = this->CGF->ConvertType(RT)->getPointerTo();
546 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
547 LValue DstBase = this->CGF->MakeAddrLValue(
548 this->CGF->Builder.CreateBitCast(DstAddr, PtrTy), FT);
549 DstLV = this->CGF->EmitLValueForField(DstBase, FD);
550 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
551 LValue SrcBase = this->CGF->MakeAddrLValue(
552 this->CGF->Builder.CreateBitCast(SrcAddr, PtrTy), FT);
553 SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
555 llvm::PointerType *Ty = this->CGF->ConvertType(FT)->getPointerTo();
556 Address DstAddr = this->CGF->Builder.CreateBitCast(Addrs[DstIdx], Ty);
557 Address SrcAddr = this->CGF->Builder.CreateBitCast(Addrs[SrcIdx], Ty);
558 DstLV = this->CGF->MakeAddrLValue(DstAddr, FT);
559 SrcLV = this->CGF->MakeAddrLValue(SrcAddr, FT);
561 RValue SrcVal = this->CGF->EmitLoadOfLValue(SrcLV, SourceLocation());
562 this->CGF->EmitStoreThroughLValue(SrcVal, DstLV);
566 // These classes that emit the special functions for a non-trivial struct.
567 struct GenDestructor : StructVisitor<GenDestructor>,
568 GenFuncBase<GenDestructor>,
569 DestructedTypeVisitor<GenDestructor> {
570 using Super = DestructedTypeVisitor<GenDestructor>;
571 GenDestructor(ASTContext &Ctx) : StructVisitor<GenDestructor>(Ctx) {}
573 void visitWithKind(QualType::DestructionKind DK, QualType FT,
574 const FieldDecl *FD, CharUnits CurStructOffset,
575 std::array<Address, 1> Addrs) {
576 if (const auto *AT = getContext().getAsArrayType(FT)) {
577 visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset, Addrs);
581 Super::visitWithKind(DK, FT, FD, CurStructOffset, Addrs);
584 void visitARCStrong(QualType QT, const FieldDecl *FD,
585 CharUnits CurStackOffset, std::array<Address, 1> Addrs) {
586 CGF->destroyARCStrongImprecise(
587 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
590 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
591 std::array<Address, 1> Addrs) {
593 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
596 void callSpecialFunction(QualType FT, CharUnits Offset,
597 std::array<Address, 1> Addrs) {
598 CGF->callCStructDestructor(
599 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
603 struct GenDefaultInitialize
604 : StructVisitor<GenDefaultInitialize>,
605 GenFuncBase<GenDefaultInitialize>,
606 DefaultInitializedTypeVisitor<GenDefaultInitialize> {
607 using Super = DefaultInitializedTypeVisitor<GenDefaultInitialize>;
608 typedef GenFuncBase<GenDefaultInitialize> GenFuncBaseTy;
610 GenDefaultInitialize(ASTContext &Ctx)
611 : StructVisitor<GenDefaultInitialize>(Ctx) {}
613 void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
614 const FieldDecl *FD, CharUnits CurStructOffset,
615 std::array<Address, 1> Addrs) {
616 if (const auto *AT = getContext().getAsArrayType(FT)) {
617 visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset,
622 Super::visitWithKind(PDIK, FT, FD, CurStructOffset, Addrs);
625 void visitARCStrong(QualType QT, const FieldDecl *FD,
626 CharUnits CurStackOffset, std::array<Address, 1> Addrs) {
627 CGF->EmitNullInitialization(
628 getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
631 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
632 std::array<Address, 1> Addrs) {
633 CGF->EmitNullInitialization(
634 getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD), QT);
637 template <class FieldKind, size_t... Is>
638 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
639 const FieldDecl *FD, CharUnits CurStackOffset,
640 std::array<Address, 1> Addrs) {
642 return visitTrivial(QualType(AT, 0), FD, CurStackOffset, Addrs);
644 ASTContext &Ctx = getContext();
645 CharUnits Size = Ctx.getTypeSizeInChars(QualType(AT, 0));
646 QualType EltTy = Ctx.getBaseElementType(QualType(AT, 0));
648 if (Size < CharUnits::fromQuantity(16) || EltTy->getAs<RecordType>()) {
649 GenFuncBaseTy::visitArray(FK, AT, IsVolatile, FD, CurStackOffset, Addrs);
653 llvm::Constant *SizeVal = CGF->Builder.getInt64(Size.getQuantity());
654 Address DstAddr = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
655 Address Loc = CGF->Builder.CreateElementBitCast(DstAddr, CGF->Int8Ty);
656 CGF->Builder.CreateMemSet(Loc, CGF->Builder.getInt8(0), SizeVal,
660 void callSpecialFunction(QualType FT, CharUnits Offset,
661 std::array<Address, 1> Addrs) {
662 CGF->callCStructDefaultConstructor(
663 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
667 struct GenCopyConstructor : GenBinaryFunc<GenCopyConstructor, false> {
668 GenCopyConstructor(ASTContext &Ctx)
669 : GenBinaryFunc<GenCopyConstructor, false>(Ctx) {}
671 void visitARCStrong(QualType QT, const FieldDecl *FD,
672 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
673 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
674 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
675 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
676 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
677 llvm::Value *Val = CGF->EmitARCRetain(QT, SrcVal);
678 CGF->EmitStoreOfScalar(Val, CGF->MakeAddrLValue(Addrs[DstIdx], QT), true);
681 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
682 std::array<Address, 2> Addrs) {
683 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
684 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
685 CGF->EmitARCCopyWeak(Addrs[DstIdx], Addrs[SrcIdx]);
688 void callSpecialFunction(QualType FT, CharUnits Offset,
689 std::array<Address, 2> Addrs) {
690 CGF->callCStructCopyConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
691 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
695 struct GenMoveConstructor : GenBinaryFunc<GenMoveConstructor, true> {
696 GenMoveConstructor(ASTContext &Ctx)
697 : GenBinaryFunc<GenMoveConstructor, true>(Ctx) {}
699 void visitARCStrong(QualType QT, const FieldDecl *FD,
700 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
701 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
702 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
703 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
704 llvm::Value *SrcVal =
705 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
706 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress()), SrcLV);
707 CGF->EmitStoreOfScalar(SrcVal, CGF->MakeAddrLValue(Addrs[DstIdx], QT),
708 /* isInitialization */ true);
711 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
712 std::array<Address, 2> Addrs) {
713 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
714 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
715 CGF->EmitARCMoveWeak(Addrs[DstIdx], Addrs[SrcIdx]);
718 void callSpecialFunction(QualType FT, CharUnits Offset,
719 std::array<Address, 2> Addrs) {
720 CGF->callCStructMoveConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
721 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
725 struct GenCopyAssignment : GenBinaryFunc<GenCopyAssignment, false> {
726 GenCopyAssignment(ASTContext &Ctx)
727 : GenBinaryFunc<GenCopyAssignment, false>(Ctx) {}
729 void visitARCStrong(QualType QT, const FieldDecl *FD,
730 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
731 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
732 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
733 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
734 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
735 CGF->EmitARCStoreStrong(CGF->MakeAddrLValue(Addrs[DstIdx], QT), SrcVal,
739 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
740 std::array<Address, 2> Addrs) {
741 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
742 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
743 CGF->emitARCCopyAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
746 void callSpecialFunction(QualType FT, CharUnits Offset,
747 std::array<Address, 2> Addrs) {
748 CGF->callCStructCopyAssignmentOperator(
749 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
750 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
754 struct GenMoveAssignment : GenBinaryFunc<GenMoveAssignment, true> {
755 GenMoveAssignment(ASTContext &Ctx)
756 : GenBinaryFunc<GenMoveAssignment, true>(Ctx) {}
758 void visitARCStrong(QualType QT, const FieldDecl *FD,
759 CharUnits CurStackOffset, std::array<Address, 2> Addrs) {
760 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
761 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
762 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
763 llvm::Value *SrcVal =
764 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
765 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress()), SrcLV);
766 LValue DstLV = CGF->MakeAddrLValue(Addrs[DstIdx], QT);
767 llvm::Value *DstVal =
768 CGF->EmitLoadOfLValue(DstLV, SourceLocation()).getScalarVal();
769 CGF->EmitStoreOfScalar(SrcVal, DstLV);
770 CGF->EmitARCRelease(DstVal, ARCImpreciseLifetime);
773 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStackOffset,
774 std::array<Address, 2> Addrs) {
775 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStackOffset, FD);
776 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStackOffset, FD);
777 CGF->emitARCMoveAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
780 void callSpecialFunction(QualType FT, CharUnits Offset,
781 std::array<Address, 2> Addrs) {
782 CGF->callCStructMoveAssignmentOperator(
783 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
784 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
790 void CodeGenFunction::destroyNonTrivialCStruct(CodeGenFunction &CGF,
791 Address Addr, QualType Type) {
792 CGF.callCStructDestructor(CGF.MakeAddrLValue(Addr, Type));
795 // Default-initialize a variable that is a non-trivial struct or an array of
797 void CodeGenFunction::defaultInitNonTrivialCStructVar(LValue Dst) {
798 GenDefaultInitialize Gen(getContext());
799 Address DstPtr = Builder.CreateBitCast(Dst.getAddress(), CGM.Int8PtrPtrTy);
801 QualType QT = Dst.getType();
802 QT = Dst.isVolatile() ? QT.withVolatile() : QT;
803 Gen.visit(QT, nullptr, CharUnits::Zero(), std::array<Address, 1>({{DstPtr}}));
806 template <class G, size_t N>
807 static void callSpecialFunction(G &&Gen, StringRef FuncName, QualType QT,
808 bool IsVolatile, CodeGenFunction &CGF,
809 std::array<Address, N> Addrs) {
810 for (unsigned I = 0; I < N; ++I)
811 Addrs[I] = CGF.Builder.CreateBitCast(Addrs[I], CGF.CGM.Int8PtrPtrTy);
812 QT = IsVolatile ? QT.withVolatile() : QT;
813 Gen.callFunc(FuncName, QT, Addrs, CGF);
816 // Functions to emit calls to the special functions of a non-trivial C struct.
817 void CodeGenFunction::callCStructDefaultConstructor(LValue Dst) {
818 bool IsVolatile = Dst.isVolatile();
819 Address DstPtr = Dst.getAddress();
820 QualType QT = Dst.getType();
821 GenDefaultInitializeFuncName GenName(DstPtr.getAlignment(), getContext());
822 std::string FuncName = GenName.getName(QT, IsVolatile);
823 callSpecialFunction(GenDefaultInitialize(getContext()), FuncName, QT,
824 IsVolatile, *this, std::array<Address, 1>({{DstPtr}}));
827 void CodeGenFunction::callCStructDestructor(LValue Dst) {
828 bool IsVolatile = Dst.isVolatile();
829 Address DstPtr = Dst.getAddress();
830 QualType QT = Dst.getType();
831 GenDestructorFuncName GenName(DstPtr.getAlignment(), getContext());
832 std::string FuncName = GenName.getName(QT, IsVolatile);
833 callSpecialFunction(GenDestructor(getContext()), FuncName, QT, IsVolatile,
834 *this, std::array<Address, 1>({{DstPtr}}));
837 void CodeGenFunction::callCStructCopyConstructor(LValue Dst, LValue Src) {
838 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
839 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
840 QualType QT = Dst.getType();
841 GenBinaryFuncName<false> GenName("__copy_constructor_", DstPtr.getAlignment(),
842 SrcPtr.getAlignment(), getContext());
843 std::string FuncName = GenName.getName(QT, IsVolatile);
844 callSpecialFunction(GenCopyConstructor(getContext()), FuncName, QT,
846 std::array<Address, 2>({{DstPtr, SrcPtr}}));
849 void CodeGenFunction::callCStructCopyAssignmentOperator(LValue Dst, LValue Src
852 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
853 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
854 QualType QT = Dst.getType();
855 GenBinaryFuncName<false> GenName("__copy_assignment_", DstPtr.getAlignment(),
856 SrcPtr.getAlignment(), getContext());
857 std::string FuncName = GenName.getName(QT, IsVolatile);
858 callSpecialFunction(GenCopyAssignment(getContext()), FuncName, QT, IsVolatile,
859 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
862 void CodeGenFunction::callCStructMoveConstructor(LValue Dst, LValue Src) {
863 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
864 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
865 QualType QT = Dst.getType();
866 GenBinaryFuncName<true> GenName("__move_constructor_", DstPtr.getAlignment(),
867 SrcPtr.getAlignment(), getContext());
868 std::string FuncName = GenName.getName(QT, IsVolatile);
869 callSpecialFunction(GenMoveConstructor(getContext()), FuncName, QT,
871 std::array<Address, 2>({{DstPtr, SrcPtr}}));
874 void CodeGenFunction::callCStructMoveAssignmentOperator(LValue Dst, LValue Src
877 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
878 Address DstPtr = Dst.getAddress(), SrcPtr = Src.getAddress();
879 QualType QT = Dst.getType();
880 GenBinaryFuncName<true> GenName("__move_assignment_", DstPtr.getAlignment(),
881 SrcPtr.getAlignment(), getContext());
882 std::string FuncName = GenName.getName(QT, IsVolatile);
883 callSpecialFunction(GenMoveAssignment(getContext()), FuncName, QT, IsVolatile,
884 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));