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
21using namespace clang;
22using namespace CodeGen;
23
24// Return the size of a field in number of bits.
25static 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
32namespace {
33enum { DstIdx = 0, SrcIdx = 1 };
34const char *ValNameStr[2] = {"dst", "src"};
35
36template <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
77template <class Derived, bool IsMove>
78struct 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
150template <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
218template <class Derived>
219struct 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.
228static llvm::Constant *getNullForVariable(Address Addr) {
229 llvm::Type *Ty = Addr.getElementType();
230 return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(Ty));
231}
232
233template <bool IsMove>
234struct 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
270struct 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
288struct 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.
306template <size_t N>
307static 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 for (auto &P : Params)
319 Args.push_back(P);
320
321 return CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
322}
323
324template <size_t N, size_t... Ints>
325static std::array<Address, N> getParamAddrs(std::index_sequence<Ints...> IntSeq,
326 std::array<CharUnits, N> Alignments,
327 FunctionArgList Args,
328 CodeGenFunction *CGF) {
329 return std::array<Address, N>{{
330 Address(CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[Ints])),
331 Alignments[Ints])...}};
332}
333
334// Template classes that are used as bases for classes that emit special
335// functions.
336template <class Derived> struct GenFuncBase {
337 template <size_t N>
338 void visitStruct(QualType FT, const FieldDecl *FD, CharUnits CurStructOffset,
339 std::array<Address, N> Addrs) {
340 this->asDerived().callSpecialFunction(
341 FT, CurStructOffset + asDerived().getFieldOffset(FD), Addrs);
342 }
343
344 template <class FieldKind, size_t N>
345 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
346 const FieldDecl *FD, CharUnits CurStructOffset,
347 std::array<Address, N> Addrs) {
348 // Non-volatile trivial fields are copied when flushTrivialFields is called.
349 if (!FK)
350 return asDerived().visitTrivial(QualType(AT, 0), FD, CurStructOffset,
351 Addrs);
352
353 asDerived().flushTrivialFields(Addrs);
354 CodeGenFunction &CGF = *this->CGF;
355 ASTContext &Ctx = CGF.getContext();
356
357 // Compute the end address.
358 QualType BaseEltQT;
359 std::array<Address, N> StartAddrs = Addrs;
360 for (unsigned I = 0; I < N; ++I)
361 StartAddrs[I] = getAddrWithOffset(Addrs[I], CurStructOffset, FD);
362 Address DstAddr = StartAddrs[DstIdx];
363 llvm::Value *NumElts = CGF.emitArrayLength(AT, BaseEltQT, DstAddr);
364 unsigned BaseEltSize = Ctx.getTypeSizeInChars(BaseEltQT).getQuantity();
365 llvm::Value *BaseEltSizeVal =
366 llvm::ConstantInt::get(NumElts->getType(), BaseEltSize);
367 llvm::Value *SizeInBytes =
368 CGF.Builder.CreateNUWMul(BaseEltSizeVal, NumElts);
369 Address BC = CGF.Builder.CreateBitCast(DstAddr, CGF.CGM.Int8PtrTy);
370 llvm::Value *DstArrayEnd =
371 CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, BC.getPointer(), SizeInBytes);
372 DstArrayEnd = CGF.Builder.CreateBitCast(DstArrayEnd, CGF.CGM.Int8PtrPtrTy,
373 "dstarray.end");
374 llvm::BasicBlock *PreheaderBB = CGF.Builder.GetInsertBlock();
375
376 // Create the header block and insert the phi instructions.
377 llvm::BasicBlock *HeaderBB = CGF.createBasicBlock("loop.header");
378 CGF.EmitBlock(HeaderBB);
379 llvm::PHINode *PHIs[N];
380
381 for (unsigned I = 0; I < N; ++I) {
382 PHIs[I] = CGF.Builder.CreatePHI(CGF.CGM.Int8PtrPtrTy, 2, "addr.cur");
383 PHIs[I]->addIncoming(StartAddrs[I].getPointer(), PreheaderBB);
384 }
385
386 // Create the exit and loop body blocks.
387 llvm::BasicBlock *ExitBB = CGF.createBasicBlock("loop.exit");
388 llvm::BasicBlock *LoopBB = CGF.createBasicBlock("loop.body");
389
390 // Emit the comparison and conditional branch instruction that jumps to
391 // either the exit or the loop body.
392 llvm::Value *Done =
393 CGF.Builder.CreateICmpEQ(PHIs[DstIdx], DstArrayEnd, "done");
394 CGF.Builder.CreateCondBr(Done, ExitBB, LoopBB);
395
396 // Visit the element of the array in the loop body.
397 CGF.EmitBlock(LoopBB);
398 QualType EltQT = AT->getElementType();
399 CharUnits EltSize = Ctx.getTypeSizeInChars(EltQT);
400 std::array<Address, N> NewAddrs = Addrs;
401
402 for (unsigned I = 0; I < N; ++I)
403 NewAddrs[I] = Address(
404 PHIs[I], StartAddrs[I].getAlignment().alignmentAtOffset(EltSize));
405
406 EltQT = IsVolatile ? EltQT.withVolatile() : EltQT;
407 this->asDerived().visitWithKind(FK, EltQT, nullptr, CharUnits::Zero(),
408 NewAddrs);
409
410 LoopBB = CGF.Builder.GetInsertBlock();
411
412 for (unsigned I = 0; I < N; ++I) {
413 // Instrs to update the destination and source addresses.
414 // Update phi instructions.
415 NewAddrs[I] = getAddrWithOffset(NewAddrs[I], EltSize);
416 PHIs[I]->addIncoming(NewAddrs[I].getPointer(), LoopBB);
417 }
418
419 // Insert an unconditional branch to the header block.
420 CGF.Builder.CreateBr(HeaderBB);
421 CGF.EmitBlock(ExitBB);
422 }
423
424 /// Return an address with the specified offset from the passed address.
425 Address getAddrWithOffset(Address Addr, CharUnits Offset) {
426 assert(Addr.isValid() && "invalid address");
427 if (Offset.getQuantity() == 0)
428 return Addr;
429 Addr = CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrTy);
430 Addr = CGF->Builder.CreateConstInBoundsGEP(Addr, Offset.getQuantity());
431 return CGF->Builder.CreateBitCast(Addr, CGF->CGM.Int8PtrPtrTy);
432 }
433
434 Address getAddrWithOffset(Address Addr, CharUnits StructFieldOffset,
435 const FieldDecl *FD) {
436 return getAddrWithOffset(Addr, StructFieldOffset +
437 asDerived().getFieldOffset(FD));
438 }
439
440 template <size_t N>
441 llvm::Function *getFunction(StringRef FuncName, QualType QT,
442 std::array<CharUnits, N> Alignments,
443 CodeGenModule &CGM) {
444 // If the special function already exists in the module, return it.
445 if (llvm::Function *F = CGM.getModule().getFunction(FuncName)) {
446 bool WrongType = false;
447 if (!F->getReturnType()->isVoidTy())
448 WrongType = true;
449 else {
450 for (const llvm::Argument &Arg : F->args())
451 if (Arg.getType() != CGM.Int8PtrPtrTy)
452 WrongType = true;
453 }
454
455 if (WrongType) {
456 std::string FuncName = std::string(F->getName());
457 SourceLocation Loc = QT->castAs<RecordType>()->getDecl()->getLocation();
458 CGM.Error(Loc, "special function " + FuncName +
459 " for non-trivial C struct has incorrect type");
460 return nullptr;
461 }
462 return F;
463 }
464
465 ASTContext &Ctx = CGM.getContext();
466 FunctionArgList Args;
467 const CGFunctionInfo &FI = getFunctionInfo<N>(CGM, Args);
468 llvm::FunctionType *FuncTy = CGM.getTypes().GetFunctionType(FI);
469 llvm::Function *F =
470 llvm::Function::Create(FuncTy, llvm::GlobalValue::LinkOnceODRLinkage,
471 FuncName, &CGM.getModule());
472 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
473 CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F);
474 CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
475 IdentifierInfo *II = &Ctx.Idents.get(FuncName);
476 FunctionDecl *FD = FunctionDecl::Create(
477 Ctx, Ctx.getTranslationUnitDecl(), SourceLocation(), SourceLocation(),
478 II, Ctx.getFunctionType(Ctx.VoidTy, llvm::None, {}), nullptr,
479 SC_PrivateExtern, false, false);
480 CodeGenFunction NewCGF(CGM);
481 setCGF(&NewCGF);
482 CGF->StartFunction(FD, Ctx.VoidTy, F, FI, Args);
483 std::array<Address, N> Addrs =
484 getParamAddrs<N>(std::make_index_sequence<N>{}, Alignments, Args, CGF);
485 asDerived().visitStructFields(QT, CharUnits::Zero(), Addrs);
486 CGF->FinishFunction();
487 return F;
488 }
489
490 template <size_t N>
491 void callFunc(StringRef FuncName, QualType QT, std::array<Address, N> Addrs,
492 CodeGenFunction &CallerCGF) {
493 std::array<CharUnits, N> Alignments;
494 llvm::Value *Ptrs[N];
495
496 for (unsigned I = 0; I < N; ++I) {
497 Alignments[I] = Addrs[I].getAlignment();
498 Ptrs[I] =
499 CallerCGF.Builder.CreateBitCast(Addrs[I], CallerCGF.CGM.Int8PtrPtrTy)
500 .getPointer();
501 }
502
503 if (llvm::Function *F =
504 getFunction(FuncName, QT, Alignments, CallerCGF.CGM))
505 CallerCGF.EmitNounwindRuntimeCall(F, Ptrs);
506 }
507
508 Derived &asDerived() { return static_cast<Derived &>(*this); }
509
510 void setCGF(CodeGenFunction *F) { CGF = F; }
511
512 CodeGenFunction *CGF = nullptr;
513};
514
515template <class Derived, bool IsMove>
516struct GenBinaryFunc : CopyStructVisitor<Derived, IsMove>,
517 GenFuncBase<Derived> {
518 GenBinaryFunc(ASTContext &Ctx) : CopyStructVisitor<Derived, IsMove>(Ctx) {}
519
520 void flushTrivialFields(std::array<Address, 2> Addrs) {
521 CharUnits Size = this->End - this->Start;
522
523 if (Size.getQuantity() == 0)
524 return;
525
526 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], this->Start);
527 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], this->Start);
528
529 // Emit memcpy.
530 if (Size.getQuantity() >= 16 || !llvm::isPowerOf2_32(Size.getQuantity())) {
531 llvm::Value *SizeVal =
532 llvm::ConstantInt::get(this->CGF->SizeTy, Size.getQuantity());
533 DstAddr =
534 this->CGF->Builder.CreateElementBitCast(DstAddr, this->CGF->Int8Ty);
535 SrcAddr =
536 this->CGF->Builder.CreateElementBitCast(SrcAddr, this->CGF->Int8Ty);
537 this->CGF->Builder.CreateMemCpy(DstAddr, SrcAddr, SizeVal, false);
538 } else {
539 llvm::Type *Ty = llvm::Type::getIntNTy(
540 this->CGF->getLLVMContext(),
541 Size.getQuantity() * this->CGF->getContext().getCharWidth());
542 DstAddr = this->CGF->Builder.CreateElementBitCast(DstAddr, Ty);
543 SrcAddr = this->CGF->Builder.CreateElementBitCast(SrcAddr, Ty);
544 llvm::Value *SrcVal = this->CGF->Builder.CreateLoad(SrcAddr, false);
545 this->CGF->Builder.CreateStore(SrcVal, DstAddr, false);
546 }
547
548 this->Start = this->End = CharUnits::Zero();
549 }
550
551 template <class... Ts>
552 void visitVolatileTrivial(QualType FT, const FieldDecl *FD, CharUnits Offset,
553 std::array<Address, 2> Addrs) {
554 LValue DstLV, SrcLV;
555 if (FD) {
556 // No need to copy zero-length bit-fields.
557 if (FD->isZeroLengthBitField(this->CGF->getContext()))
558 return;
559
560 QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
561 llvm::PointerType *PtrTy = this->CGF->ConvertType(RT)->getPointerTo();
562 Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
563 LValue DstBase = this->CGF->MakeAddrLValue(
564 this->CGF->Builder.CreateBitCast(DstAddr, PtrTy), FT);
565 DstLV = this->CGF->EmitLValueForField(DstBase, FD);
566 Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
567 LValue SrcBase = this->CGF->MakeAddrLValue(
568 this->CGF->Builder.CreateBitCast(SrcAddr, PtrTy), FT);
569 SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
570 } else {
571 llvm::PointerType *Ty = this->CGF->ConvertTypeForMem(FT)->getPointerTo();
572 Address DstAddr = this->CGF->Builder.CreateBitCast(Addrs[DstIdx], Ty);
573 Address SrcAddr = this->CGF->Builder.CreateBitCast(Addrs[SrcIdx], Ty);
574 DstLV = this->CGF->MakeAddrLValue(DstAddr, FT);
575 SrcLV = this->CGF->MakeAddrLValue(SrcAddr, FT);
576 }
577 RValue SrcVal = this->CGF->EmitLoadOfLValue(SrcLV, SourceLocation());
578 this->CGF->EmitStoreThroughLValue(SrcVal, DstLV);
579 }
580};
581
582// These classes that emit the special functions for a non-trivial struct.
583struct GenDestructor : StructVisitor<GenDestructor>,
584 GenFuncBase<GenDestructor>,
585 DestructedTypeVisitor<GenDestructor> {
586 using Super = DestructedTypeVisitor<GenDestructor>;
587 GenDestructor(ASTContext &Ctx) : StructVisitor<GenDestructor>(Ctx) {}
588
589 void visitWithKind(QualType::DestructionKind DK, QualType FT,
590 const FieldDecl *FD, CharUnits CurStructOffset,
591 std::array<Address, 1> Addrs) {
592 if (const auto *AT = getContext().getAsArrayType(FT)) {
593 visitArray(DK, AT, FT.isVolatileQualified(), FD, CurStructOffset, Addrs);
594 return;
595 }
596
597 Super::visitWithKind(DK, FT, FD, CurStructOffset, Addrs);
598 }
599
600 void visitARCStrong(QualType QT, const FieldDecl *FD,
601 CharUnits CurStructOffset, std::array<Address, 1> Addrs) {
602 CGF->destroyARCStrongImprecise(
603 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
604 }
605
606 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
607 std::array<Address, 1> Addrs) {
608 CGF->destroyARCWeak(
609 *CGF, getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
610 }
611
612 void callSpecialFunction(QualType FT, CharUnits Offset,
613 std::array<Address, 1> Addrs) {
614 CGF->callCStructDestructor(
615 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
616 }
617};
618
619struct GenDefaultInitialize
620 : StructVisitor<GenDefaultInitialize>,
621 GenFuncBase<GenDefaultInitialize>,
622 DefaultInitializedTypeVisitor<GenDefaultInitialize> {
623 using Super = DefaultInitializedTypeVisitor<GenDefaultInitialize>;
624 typedef GenFuncBase<GenDefaultInitialize> GenFuncBaseTy;
625
626 GenDefaultInitialize(ASTContext &Ctx)
627 : StructVisitor<GenDefaultInitialize>(Ctx) {}
628
629 void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
630 const FieldDecl *FD, CharUnits CurStructOffset,
631 std::array<Address, 1> Addrs) {
632 if (const auto *AT = getContext().getAsArrayType(FT)) {
633 visitArray(PDIK, AT, FT.isVolatileQualified(), FD, CurStructOffset,
634 Addrs);
635 return;
636 }
637
638 Super::visitWithKind(PDIK, FT, FD, CurStructOffset, Addrs);
639 }
640
641 void visitARCStrong(QualType QT, const FieldDecl *FD,
642 CharUnits CurStructOffset, std::array<Address, 1> Addrs) {
643 CGF->EmitNullInitialization(
644 getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
645 }
646
647 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
648 std::array<Address, 1> Addrs) {
649 CGF->EmitNullInitialization(
650 getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD), QT);
651 }
652
653 template <class FieldKind, size_t... Is>
654 void visitArray(FieldKind FK, const ArrayType *AT, bool IsVolatile,
655 const FieldDecl *FD, CharUnits CurStructOffset,
656 std::array<Address, 1> Addrs) {
657 if (!FK)
658 return visitTrivial(QualType(AT, 0), FD, CurStructOffset, Addrs);
659
660 ASTContext &Ctx = getContext();
661 CharUnits Size = Ctx.getTypeSizeInChars(QualType(AT, 0));
662 QualType EltTy = Ctx.getBaseElementType(QualType(AT, 0));
663
664 if (Size < CharUnits::fromQuantity(16) || EltTy->getAs<RecordType>()) {
665 GenFuncBaseTy::visitArray(FK, AT, IsVolatile, FD, CurStructOffset, Addrs);
666 return;
667 }
668
669 llvm::Constant *SizeVal = CGF->Builder.getInt64(Size.getQuantity());
670 Address DstAddr = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
671 Address Loc = CGF->Builder.CreateElementBitCast(DstAddr, CGF->Int8Ty);
672 CGF->Builder.CreateMemSet(Loc, CGF->Builder.getInt8(0), SizeVal,
673 IsVolatile);
674 }
675
676 void callSpecialFunction(QualType FT, CharUnits Offset,
677 std::array<Address, 1> Addrs) {
678 CGF->callCStructDefaultConstructor(
679 CGF->MakeAddrLValue(getAddrWithOffset(Addrs[DstIdx], Offset), FT));
680 }
681};
682
683struct GenCopyConstructor : GenBinaryFunc<GenCopyConstructor, false> {
684 GenCopyConstructor(ASTContext &Ctx)
685 : GenBinaryFunc<GenCopyConstructor, false>(Ctx) {}
686
687 void visitARCStrong(QualType QT, const FieldDecl *FD,
688 CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
689 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
690 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
691 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
692 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
693 llvm::Value *Val = CGF->EmitARCRetain(QT, SrcVal);
694 CGF->EmitStoreOfScalar(Val, CGF->MakeAddrLValue(Addrs[DstIdx], QT), true);
695 }
696
697 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
698 std::array<Address, 2> Addrs) {
699 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
700 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
701 CGF->EmitARCCopyWeak(Addrs[DstIdx], Addrs[SrcIdx]);
702 }
703
704 void callSpecialFunction(QualType FT, CharUnits Offset,
705 std::array<Address, 2> Addrs) {
706 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
707 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
708 CGF->callCStructCopyConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
709 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
710 }
711};
712
713struct GenMoveConstructor : GenBinaryFunc<GenMoveConstructor, true> {
714 GenMoveConstructor(ASTContext &Ctx)
715 : GenBinaryFunc<GenMoveConstructor, true>(Ctx) {}
716
717 void visitARCStrong(QualType QT, const FieldDecl *FD,
718 CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
719 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
720 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
721 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
722 llvm::Value *SrcVal =
723 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
724 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress(*CGF)), SrcLV);
725 CGF->EmitStoreOfScalar(SrcVal, CGF->MakeAddrLValue(Addrs[DstIdx], QT),
726 /* isInitialization */ true);
727 }
728
729 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
730 std::array<Address, 2> Addrs) {
731 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
732 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
733 CGF->EmitARCMoveWeak(Addrs[DstIdx], Addrs[SrcIdx]);
734 }
735
736 void callSpecialFunction(QualType FT, CharUnits Offset,
737 std::array<Address, 2> Addrs) {
738 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
739 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
740 CGF->callCStructMoveConstructor(CGF->MakeAddrLValue(Addrs[DstIdx], FT),
741 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
742 }
743};
744
745struct GenCopyAssignment : GenBinaryFunc<GenCopyAssignment, false> {
746 GenCopyAssignment(ASTContext &Ctx)
747 : GenBinaryFunc<GenCopyAssignment, false>(Ctx) {}
748
749 void visitARCStrong(QualType QT, const FieldDecl *FD,
750 CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
751 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
752 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
753 llvm::Value *SrcVal = CGF->EmitLoadOfScalar(
754 Addrs[SrcIdx], QT.isVolatileQualified(), QT, SourceLocation());
755 CGF->EmitARCStoreStrong(CGF->MakeAddrLValue(Addrs[DstIdx], QT), SrcVal,
756 false);
757 }
758
759 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
760 std::array<Address, 2> Addrs) {
761 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
762 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
763 CGF->emitARCCopyAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
764 }
765
766 void callSpecialFunction(QualType FT, CharUnits Offset,
767 std::array<Address, 2> Addrs) {
768 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
769 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
770 CGF->callCStructCopyAssignmentOperator(
771 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
772 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
773 }
774};
775
776struct GenMoveAssignment : GenBinaryFunc<GenMoveAssignment, true> {
777 GenMoveAssignment(ASTContext &Ctx)
778 : GenBinaryFunc<GenMoveAssignment, true>(Ctx) {}
779
780 void visitARCStrong(QualType QT, const FieldDecl *FD,
781 CharUnits CurStructOffset, std::array<Address, 2> Addrs) {
782 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
783 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
784 LValue SrcLV = CGF->MakeAddrLValue(Addrs[SrcIdx], QT);
785 llvm::Value *SrcVal =
786 CGF->EmitLoadOfLValue(SrcLV, SourceLocation()).getScalarVal();
787 CGF->EmitStoreOfScalar(getNullForVariable(SrcLV.getAddress(*CGF)), SrcLV);
788 LValue DstLV = CGF->MakeAddrLValue(Addrs[DstIdx], QT);
789 llvm::Value *DstVal =
790 CGF->EmitLoadOfLValue(DstLV, SourceLocation()).getScalarVal();
791 CGF->EmitStoreOfScalar(SrcVal, DstLV);
792 CGF->EmitARCRelease(DstVal, ARCImpreciseLifetime);
793 }
794
795 void visitARCWeak(QualType QT, const FieldDecl *FD, CharUnits CurStructOffset,
796 std::array<Address, 2> Addrs) {
797 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], CurStructOffset, FD);
798 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], CurStructOffset, FD);
799 CGF->emitARCMoveAssignWeak(QT, Addrs[DstIdx], Addrs[SrcIdx]);
800 }
801
802 void callSpecialFunction(QualType FT, CharUnits Offset,
803 std::array<Address, 2> Addrs) {
804 Addrs[DstIdx] = getAddrWithOffset(Addrs[DstIdx], Offset);
805 Addrs[SrcIdx] = getAddrWithOffset(Addrs[SrcIdx], Offset);
806 CGF->callCStructMoveAssignmentOperator(
807 CGF->MakeAddrLValue(Addrs[DstIdx], FT),
808 CGF->MakeAddrLValue(Addrs[SrcIdx], FT));
809 }
810};
811
812} // namespace
813
814void CodeGenFunction::destroyNonTrivialCStruct(CodeGenFunction &CGF,
815 Address Addr, QualType Type) {
816 CGF.callCStructDestructor(CGF.MakeAddrLValue(Addr, Type));
817}
818
819// Default-initialize a variable that is a non-trivial struct or an array of
820// such structure.
821void CodeGenFunction::defaultInitNonTrivialCStructVar(LValue Dst) {
822 GenDefaultInitialize Gen(getContext());
823 Address DstPtr =
824 Builder.CreateBitCast(Dst.getAddress(*this), CGM.Int8PtrPtrTy);
825 Gen.setCGF(this);
826 QualType QT = Dst.getType();
827 QT = Dst.isVolatile() ? QT.withVolatile() : QT;
828 Gen.visit(QT, nullptr, CharUnits::Zero(), std::array<Address, 1>({{DstPtr}}));
829}
830
831template <class G, size_t N>
832static void callSpecialFunction(G &&Gen, StringRef FuncName, QualType QT,
833 bool IsVolatile, CodeGenFunction &CGF,
834 std::array<Address, N> Addrs) {
835 auto SetArtificialLoc = ApplyDebugLocation::CreateArtificial(CGF);
836 for (unsigned I = 0; I < N; ++I)
837 Addrs[I] = CGF.Builder.CreateBitCast(Addrs[I], CGF.CGM.Int8PtrPtrTy);
838 QT = IsVolatile ? QT.withVolatile() : QT;
839 Gen.callFunc(FuncName, QT, Addrs, CGF);
840}
841
842template <class G, size_t N>
843static llvm::Function *
844getSpecialFunction(G &&Gen, StringRef FuncName, QualType QT, bool IsVolatile,
845 std::array<CharUnits, N> Alignments, CodeGenModule &CGM) {
846 QT = IsVolatile ? QT.withVolatile() : QT;
847 // The following call requires an array of addresses as arguments, but doesn't
848 // actually use them (it overwrites them with the addresses of the arguments
849 // of the created function).
850 return Gen.getFunction(FuncName, QT, Alignments, CGM);
851}
852
853// Functions to emit calls to the special functions of a non-trivial C struct.
854void CodeGenFunction::callCStructDefaultConstructor(LValue Dst) {
855 bool IsVolatile = Dst.isVolatile();
856 Address DstPtr = Dst.getAddress(*this);
857 QualType QT = Dst.getType();
858 GenDefaultInitializeFuncName GenName(DstPtr.getAlignment(), getContext());
859 std::string FuncName = GenName.getName(QT, IsVolatile);
860 callSpecialFunction(GenDefaultInitialize(getContext()), FuncName, QT,
861 IsVolatile, *this, std::array<Address, 1>({{DstPtr}}));
862}
863
864std::string CodeGenFunction::getNonTrivialCopyConstructorStr(
865 QualType QT, CharUnits Alignment, bool IsVolatile, ASTContext &Ctx) {
866 GenBinaryFuncName<false> GenName("", Alignment, Alignment, Ctx);
867 return GenName.getName(QT, IsVolatile);
868}
869
870std::string CodeGenFunction::getNonTrivialDestructorStr(QualType QT,
871 CharUnits Alignment,
872 bool IsVolatile,
873 ASTContext &Ctx) {
874 GenDestructorFuncName GenName("", Alignment, Ctx);
875 return GenName.getName(QT, IsVolatile);
876}
877
878void CodeGenFunction::callCStructDestructor(LValue Dst) {
879 bool IsVolatile = Dst.isVolatile();
880 Address DstPtr = Dst.getAddress(*this);
881 QualType QT = Dst.getType();
882 GenDestructorFuncName GenName("__destructor_", DstPtr.getAlignment(),
883 getContext());
884 std::string FuncName = GenName.getName(QT, IsVolatile);
885 callSpecialFunction(GenDestructor(getContext()), FuncName, QT, IsVolatile,
886 *this, std::array<Address, 1>({{DstPtr}}));
887}
888
889void CodeGenFunction::callCStructCopyConstructor(LValue Dst, LValue Src) {
890 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
891 Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
892 QualType QT = Dst.getType();
893 GenBinaryFuncName<false> GenName("__copy_constructor_", DstPtr.getAlignment(),
894 SrcPtr.getAlignment(), getContext());
895 std::string FuncName = GenName.getName(QT, IsVolatile);
896 callSpecialFunction(GenCopyConstructor(getContext()), FuncName, QT,
897 IsVolatile, *this,
898 std::array<Address, 2>({{DstPtr, SrcPtr}}));
899}
900
901void CodeGenFunction::callCStructCopyAssignmentOperator(LValue Dst, LValue Src
902
903) {
904 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
905 Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
906 QualType QT = Dst.getType();
907 GenBinaryFuncName<false> GenName("__copy_assignment_", DstPtr.getAlignment(),
908 SrcPtr.getAlignment(), getContext());
909 std::string FuncName = GenName.getName(QT, IsVolatile);
910 callSpecialFunction(GenCopyAssignment(getContext()), FuncName, QT, IsVolatile,
911 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
912}
913
914void CodeGenFunction::callCStructMoveConstructor(LValue Dst, LValue Src) {
915 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
916 Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
917 QualType QT = Dst.getType();
918 GenBinaryFuncName<true> GenName("__move_constructor_", DstPtr.getAlignment(),
919 SrcPtr.getAlignment(), getContext());
920 std::string FuncName = GenName.getName(QT, IsVolatile);
921 callSpecialFunction(GenMoveConstructor(getContext()), FuncName, QT,
922 IsVolatile, *this,
923 std::array<Address, 2>({{DstPtr, SrcPtr}}));
924}
925
926void CodeGenFunction::callCStructMoveAssignmentOperator(LValue Dst, LValue Src
927
928) {
929 bool IsVolatile = Dst.isVolatile() || Src.isVolatile();
930 Address DstPtr = Dst.getAddress(*this), SrcPtr = Src.getAddress(*this);
931 QualType QT = Dst.getType();
932 GenBinaryFuncName<true> GenName("__move_assignment_", DstPtr.getAlignment(),
933 SrcPtr.getAlignment(), getContext());
934 std::string FuncName = GenName.getName(QT, IsVolatile);
935 callSpecialFunction(GenMoveAssignment(getContext()), FuncName, QT, IsVolatile,
936 *this, std::array<Address, 2>({{DstPtr, SrcPtr}}));
937}
938
939llvm::Function *clang::CodeGen::getNonTrivialCStructDefaultConstructor(
940 CodeGenModule &CGM, CharUnits DstAlignment, bool IsVolatile, QualType QT) {
941 ASTContext &Ctx = CGM.getContext();
942 GenDefaultInitializeFuncName GenName(DstAlignment, Ctx);
943 std::string FuncName = GenName.getName(QT, IsVolatile);
944 return getSpecialFunction(GenDefaultInitialize(Ctx), FuncName, QT, IsVolatile,
945 std::array<CharUnits, 1>({{DstAlignment}}), CGM);
946}
947
948llvm::Function *clang::CodeGen::getNonTrivialCStructCopyConstructor(
949 CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
950 bool IsVolatile, QualType QT) {
951 ASTContext &Ctx = CGM.getContext();
952 GenBinaryFuncName<false> GenName("__copy_constructor_", DstAlignment,
953 SrcAlignment, Ctx);
954 std::string FuncName = GenName.getName(QT, IsVolatile);
955 return getSpecialFunction(
956 GenCopyConstructor(Ctx), FuncName, QT, IsVolatile,
957 std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
958}
959
960llvm::Function *clang::CodeGen::getNonTrivialCStructMoveConstructor(
961 CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
962 bool IsVolatile, QualType QT) {
963 ASTContext &Ctx = CGM.getContext();
964 GenBinaryFuncName<true> GenName("__move_constructor_", DstAlignment,
965 SrcAlignment, Ctx);
966 std::string FuncName = GenName.getName(QT, IsVolatile);
967 return getSpecialFunction(
968 GenMoveConstructor(Ctx), FuncName, QT, IsVolatile,
969 std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
970}
971
972llvm::Function *clang::CodeGen::getNonTrivialCStructCopyAssignmentOperator(
973 CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
974 bool IsVolatile, QualType QT) {
975 ASTContext &Ctx = CGM.getContext();
976 GenBinaryFuncName<false> GenName("__copy_assignment_", DstAlignment,
977 SrcAlignment, Ctx);
978 std::string FuncName = GenName.getName(QT, IsVolatile);
979 return getSpecialFunction(
980 GenCopyAssignment(Ctx), FuncName, QT, IsVolatile,
981 std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
982}
983
984llvm::Function *clang::CodeGen::getNonTrivialCStructMoveAssignmentOperator(
985 CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
986 bool IsVolatile, QualType QT) {
987 ASTContext &Ctx = CGM.getContext();
988 GenBinaryFuncName<true> GenName("__move_assignment_", DstAlignment,
989 SrcAlignment, Ctx);
990 std::string FuncName = GenName.getName(QT, IsVolatile);
991 return getSpecialFunction(
992 GenMoveAssignment(Ctx), FuncName, QT, IsVolatile,
993 std::array<CharUnits, 2>({{DstAlignment, SrcAlignment}}), CGM);
994}
995
996llvm::Function *clang::CodeGen::getNonTrivialCStructDestructor(
997 CodeGenModule &CGM, CharUnits DstAlignment, bool IsVolatile, QualType QT) {
998 ASTContext &Ctx = CGM.getContext();
999 GenDestructorFuncName GenName("__destructor_", DstAlignment, Ctx);
1000 std::string FuncName = GenName.getName(QT, IsVolatile);
1001 return getSpecialFunction(GenDestructor(Ctx), FuncName, QT, IsVolatile,
1002 std::array<CharUnits, 1>({{DstAlignment}}), CGM);
1003}
1004