1 //===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===//
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 is the code that handles AST -> LLVM type lowering.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "CodeGenTypes.h"
14 #include "CGCXXABI.h"
15 #include "CGCall.h"
16 #include "CGOpenCLRuntime.h"
17 #include "CGRecordLayout.h"
18 #include "TargetInfo.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/CodeGen/CGFunctionInfo.h"
25 #include "llvm/IR/DataLayout.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/Module.h"
28 using namespace clang;
29 using namespace CodeGen;
30
CodeGenTypes(CodeGenModule & cgm)31 CodeGenTypes::CodeGenTypes(CodeGenModule &cgm)
32 : CGM(cgm), Context(cgm.getContext()), TheModule(cgm.getModule()),
33 Target(cgm.getTarget()), TheCXXABI(cgm.getCXXABI()),
34 TheABIInfo(cgm.getTargetCodeGenInfo().getABIInfo()) {
35 SkippedLayout = false;
36 }
37
~CodeGenTypes()38 CodeGenTypes::~CodeGenTypes() {
39 for (llvm::FoldingSet<CGFunctionInfo>::iterator
40 I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; )
41 delete &*I++;
42 }
43
getCodeGenOpts() const44 const CodeGenOptions &CodeGenTypes::getCodeGenOpts() const {
45 return CGM.getCodeGenOpts();
46 }
47
addRecordTypeName(const RecordDecl * RD,llvm::StructType * Ty,StringRef suffix)48 void CodeGenTypes::addRecordTypeName(const RecordDecl *RD,
49 llvm::StructType *Ty,
50 StringRef suffix) {
51 SmallString<256> TypeName;
52 llvm::raw_svector_ostream OS(TypeName);
53 OS << RD->getKindName() << '.';
54
55 // Name the codegen type after the typedef name
56 // if there is no tag type name available
57 if (RD->getIdentifier()) {
58 // FIXME: We should not have to check for a null decl context here.
59 // Right now we do it because the implicit Obj-C decls don't have one.
60 if (RD->getDeclContext())
61 RD->printQualifiedName(OS);
62 else
63 RD->printName(OS);
64 } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) {
65 // FIXME: We should not have to check for a null decl context here.
66 // Right now we do it because the implicit Obj-C decls don't have one.
67 if (TDD->getDeclContext())
68 TDD->printQualifiedName(OS);
69 else
70 TDD->printName(OS);
71 } else
72 OS << "anon";
73
74 if (!suffix.empty())
75 OS << suffix;
76
77 Ty->setName(OS.str());
78 }
79
80 /// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
81 /// ConvertType in that it is used to convert to the memory representation for
82 /// a type. For example, the scalar representation for _Bool is i1, but the
83 /// memory representation is usually i8 or i32, depending on the target.
ConvertTypeForMem(QualType T,bool ForBitField)84 llvm::Type *CodeGenTypes::ConvertTypeForMem(QualType T, bool ForBitField) {
85 if (T->isConstantMatrixType()) {
86 const Type *Ty = Context.getCanonicalType(T).getTypePtr();
87 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty);
88 return llvm::ArrayType::get(ConvertType(MT->getElementType()),
89 MT->getNumRows() * MT->getNumColumns());
90 }
91
92 llvm::Type *R = ConvertType(T);
93
94 // If this is a bool type, or an ExtIntType in a bitfield representation,
95 // map this integer to the target-specified size.
96 if ((ForBitField && T->isExtIntType()) || R->isIntegerTy(1))
97 return llvm::IntegerType::get(getLLVMContext(),
98 (unsigned)Context.getTypeSize(T));
99
100 // Else, don't map it.
101 return R;
102 }
103
104 /// isRecordLayoutComplete - Return true if the specified type is already
105 /// completely laid out.
isRecordLayoutComplete(const Type * Ty) const106 bool CodeGenTypes::isRecordLayoutComplete(const Type *Ty) const {
107 llvm::DenseMap<const Type*, llvm::StructType *>::const_iterator I =
108 RecordDeclTypes.find(Ty);
109 return I != RecordDeclTypes.end() && !I->second->isOpaque();
110 }
111
112 static bool
113 isSafeToConvert(QualType T, CodeGenTypes &CGT,
114 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked);
115
116
117 /// isSafeToConvert - Return true if it is safe to convert the specified record
118 /// decl to IR and lay it out, false if doing so would cause us to get into a
119 /// recursive compilation mess.
120 static bool
isSafeToConvert(const RecordDecl * RD,CodeGenTypes & CGT,llvm::SmallPtrSet<const RecordDecl *,16> & AlreadyChecked)121 isSafeToConvert(const RecordDecl *RD, CodeGenTypes &CGT,
122 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
123 // If we have already checked this type (maybe the same type is used by-value
124 // multiple times in multiple structure fields, don't check again.
125 if (!AlreadyChecked.insert(RD).second)
126 return true;
127
128 const Type *Key = CGT.getContext().getTagDeclType(RD).getTypePtr();
129
130 // If this type is already laid out, converting it is a noop.
131 if (CGT.isRecordLayoutComplete(Key)) return true;
132
133 // If this type is currently being laid out, we can't recursively compile it.
134 if (CGT.isRecordBeingLaidOut(Key))
135 return false;
136
137 // If this type would require laying out bases that are currently being laid
138 // out, don't do it. This includes virtual base classes which get laid out
139 // when a class is translated, even though they aren't embedded by-value into
140 // the class.
141 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
142 for (const auto &I : CRD->bases())
143 if (!isSafeToConvert(I.getType()->castAs<RecordType>()->getDecl(), CGT,
144 AlreadyChecked))
145 return false;
146 }
147
148 // If this type would require laying out members that are currently being laid
149 // out, don't do it.
150 for (const auto *I : RD->fields())
151 if (!isSafeToConvert(I->getType(), CGT, AlreadyChecked))
152 return false;
153
154 // If there are no problems, lets do it.
155 return true;
156 }
157
158 /// isSafeToConvert - Return true if it is safe to convert this field type,
159 /// which requires the structure elements contained by-value to all be
160 /// recursively safe to convert.
161 static bool
isSafeToConvert(QualType T,CodeGenTypes & CGT,llvm::SmallPtrSet<const RecordDecl *,16> & AlreadyChecked)162 isSafeToConvert(QualType T, CodeGenTypes &CGT,
163 llvm::SmallPtrSet<const RecordDecl*, 16> &AlreadyChecked) {
164 // Strip off atomic type sugar.
165 if (const auto *AT = T->getAs<AtomicType>())
166 T = AT->getValueType();
167
168 // If this is a record, check it.
169 if (const auto *RT = T->getAs<RecordType>())
170 return isSafeToConvert(RT->getDecl(), CGT, AlreadyChecked);
171
172 // If this is an array, check the elements, which are embedded inline.
173 if (const auto *AT = CGT.getContext().getAsArrayType(T))
174 return isSafeToConvert(AT->getElementType(), CGT, AlreadyChecked);
175
176 // Otherwise, there is no concern about transforming this. We only care about
177 // things that are contained by-value in a structure that can have another
178 // structure as a member.
179 return true;
180 }
181
182
183 /// isSafeToConvert - Return true if it is safe to convert the specified record
184 /// decl to IR and lay it out, false if doing so would cause us to get into a
185 /// recursive compilation mess.
isSafeToConvert(const RecordDecl * RD,CodeGenTypes & CGT)186 static bool isSafeToConvert(const RecordDecl *RD, CodeGenTypes &CGT) {
187 // If no structs are being laid out, we can certainly do this one.
188 if (CGT.noRecordsBeingLaidOut()) return true;
189
190 llvm::SmallPtrSet<const RecordDecl*, 16> AlreadyChecked;
191 return isSafeToConvert(RD, CGT, AlreadyChecked);
192 }
193
194 /// isFuncParamTypeConvertible - Return true if the specified type in a
195 /// function parameter or result position can be converted to an IR type at this
196 /// point. This boils down to being whether it is complete, as well as whether
197 /// we've temporarily deferred expanding the type because we're in a recursive
198 /// context.
isFuncParamTypeConvertible(QualType Ty)199 bool CodeGenTypes::isFuncParamTypeConvertible(QualType Ty) {
200 // Some ABIs cannot have their member pointers represented in IR unless
201 // certain circumstances have been reached.
202 if (const auto *MPT = Ty->getAs<MemberPointerType>())
203 return getCXXABI().isMemberPointerConvertible(MPT);
204
205 // If this isn't a tagged type, we can convert it!
206 const TagType *TT = Ty->getAs<TagType>();
207 if (!TT) return true;
208
209 // Incomplete types cannot be converted.
210 if (TT->isIncompleteType())
211 return false;
212
213 // If this is an enum, then it is always safe to convert.
214 const RecordType *RT = dyn_cast<RecordType>(TT);
215 if (!RT) return true;
216
217 // Otherwise, we have to be careful. If it is a struct that we're in the
218 // process of expanding, then we can't convert the function type. That's ok
219 // though because we must be in a pointer context under the struct, so we can
220 // just convert it to a dummy type.
221 //
222 // We decide this by checking whether ConvertRecordDeclType returns us an
223 // opaque type for a struct that we know is defined.
224 return isSafeToConvert(RT->getDecl(), *this);
225 }
226
227
228 /// Code to verify a given function type is complete, i.e. the return type
229 /// and all of the parameter types are complete. Also check to see if we are in
230 /// a RS_StructPointer context, and if so whether any struct types have been
231 /// pended. If so, we don't want to ask the ABI lowering code to handle a type
232 /// that cannot be converted to an IR type.
isFuncTypeConvertible(const FunctionType * FT)233 bool CodeGenTypes::isFuncTypeConvertible(const FunctionType *FT) {
234 if (!isFuncParamTypeConvertible(FT->getReturnType()))
235 return false;
236
237 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
238 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
239 if (!isFuncParamTypeConvertible(FPT->getParamType(i)))
240 return false;
241
242 return true;
243 }
244
245 /// UpdateCompletedType - When we find the full definition for a TagDecl,
246 /// replace the 'opaque' type we previously made for it if applicable.
UpdateCompletedType(const TagDecl * TD)247 void CodeGenTypes::UpdateCompletedType(const TagDecl *TD) {
248 // If this is an enum being completed, then we flush all non-struct types from
249 // the cache. This allows function types and other things that may be derived
250 // from the enum to be recomputed.
251 if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) {
252 // Only flush the cache if we've actually already converted this type.
253 if (TypeCache.count(ED->getTypeForDecl())) {
254 // Okay, we formed some types based on this. We speculated that the enum
255 // would be lowered to i32, so we only need to flush the cache if this
256 // didn't happen.
257 if (!ConvertType(ED->getIntegerType())->isIntegerTy(32))
258 TypeCache.clear();
259 }
260 // If necessary, provide the full definition of a type only used with a
261 // declaration so far.
262 if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
263 DI->completeType(ED);
264 return;
265 }
266
267 // If we completed a RecordDecl that we previously used and converted to an
268 // anonymous type, then go ahead and complete it now.
269 const RecordDecl *RD = cast<RecordDecl>(TD);
270 if (RD->isDependentType()) return;
271
272 // Only complete it if we converted it already. If we haven't converted it
273 // yet, we'll just do it lazily.
274 if (RecordDeclTypes.count(Context.getTagDeclType(RD).getTypePtr()))
275 ConvertRecordDeclType(RD);
276
277 // If necessary, provide the full definition of a type only used with a
278 // declaration so far.
279 if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
280 DI->completeType(RD);
281 }
282
RefreshTypeCacheForClass(const CXXRecordDecl * RD)283 void CodeGenTypes::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
284 QualType T = Context.getRecordType(RD);
285 T = Context.getCanonicalType(T);
286
287 const Type *Ty = T.getTypePtr();
288 if (RecordsWithOpaqueMemberPointers.count(Ty)) {
289 TypeCache.clear();
290 RecordsWithOpaqueMemberPointers.clear();
291 }
292 }
293
getTypeForFormat(llvm::LLVMContext & VMContext,const llvm::fltSemantics & format,bool UseNativeHalf=false)294 static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext,
295 const llvm::fltSemantics &format,
296 bool UseNativeHalf = false) {
297 if (&format == &llvm::APFloat::IEEEhalf()) {
298 if (UseNativeHalf)
299 return llvm::Type::getHalfTy(VMContext);
300 else
301 return llvm::Type::getInt16Ty(VMContext);
302 }
303 if (&format == &llvm::APFloat::BFloat())
304 return llvm::Type::getBFloatTy(VMContext);
305 if (&format == &llvm::APFloat::IEEEsingle())
306 return llvm::Type::getFloatTy(VMContext);
307 if (&format == &llvm::APFloat::IEEEdouble())
308 return llvm::Type::getDoubleTy(VMContext);
309 if (&format == &llvm::APFloat::IEEEquad())
310 return llvm::Type::getFP128Ty(VMContext);
311 if (&format == &llvm::APFloat::PPCDoubleDouble())
312 return llvm::Type::getPPC_FP128Ty(VMContext);
313 if (&format == &llvm::APFloat::x87DoubleExtended())
314 return llvm::Type::getX86_FP80Ty(VMContext);
315 llvm_unreachable("Unknown float format!");
316 }
317
ConvertFunctionTypeInternal(QualType QFT)318 llvm::Type *CodeGenTypes::ConvertFunctionTypeInternal(QualType QFT) {
319 assert(QFT.isCanonical());
320 const Type *Ty = QFT.getTypePtr();
321 const FunctionType *FT = cast<FunctionType>(QFT.getTypePtr());
322 // First, check whether we can build the full function type. If the
323 // function type depends on an incomplete type (e.g. a struct or enum), we
324 // cannot lower the function type.
325 if (!isFuncTypeConvertible(FT)) {
326 // This function's type depends on an incomplete tag type.
327
328 // Force conversion of all the relevant record types, to make sure
329 // we re-convert the FunctionType when appropriate.
330 if (const RecordType *RT = FT->getReturnType()->getAs<RecordType>())
331 ConvertRecordDeclType(RT->getDecl());
332 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
333 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
334 if (const RecordType *RT = FPT->getParamType(i)->getAs<RecordType>())
335 ConvertRecordDeclType(RT->getDecl());
336
337 SkippedLayout = true;
338
339 // Return a placeholder type.
340 return llvm::StructType::get(getLLVMContext());
341 }
342
343 // While we're converting the parameter types for a function, we don't want
344 // to recursively convert any pointed-to structs. Converting directly-used
345 // structs is ok though.
346 if (!RecordsBeingLaidOut.insert(Ty).second) {
347 SkippedLayout = true;
348 return llvm::StructType::get(getLLVMContext());
349 }
350
351 // The function type can be built; call the appropriate routines to
352 // build it.
353 const CGFunctionInfo *FI;
354 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) {
355 FI = &arrangeFreeFunctionType(
356 CanQual<FunctionProtoType>::CreateUnsafe(QualType(FPT, 0)));
357 } else {
358 const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(FT);
359 FI = &arrangeFreeFunctionType(
360 CanQual<FunctionNoProtoType>::CreateUnsafe(QualType(FNPT, 0)));
361 }
362
363 llvm::Type *ResultType = nullptr;
364 // If there is something higher level prodding our CGFunctionInfo, then
365 // don't recurse into it again.
366 if (FunctionsBeingProcessed.count(FI)) {
367
368 ResultType = llvm::StructType::get(getLLVMContext());
369 SkippedLayout = true;
370 } else {
371
372 // Otherwise, we're good to go, go ahead and convert it.
373 ResultType = GetFunctionType(*FI);
374 }
375
376 RecordsBeingLaidOut.erase(Ty);
377
378 if (SkippedLayout)
379 TypeCache.clear();
380
381 if (RecordsBeingLaidOut.empty())
382 while (!DeferredRecords.empty())
383 ConvertRecordDeclType(DeferredRecords.pop_back_val());
384 return ResultType;
385 }
386
387 /// ConvertType - Convert the specified type to its LLVM form.
ConvertType(QualType T)388 llvm::Type *CodeGenTypes::ConvertType(QualType T) {
389 T = Context.getCanonicalType(T);
390
391 const Type *Ty = T.getTypePtr();
392
393 // For the device-side compilation, CUDA device builtin surface/texture types
394 // may be represented in different types.
395 if (Context.getLangOpts().CUDAIsDevice) {
396 if (T->isCUDADeviceBuiltinSurfaceType()) {
397 if (auto *Ty = CGM.getTargetCodeGenInfo()
398 .getCUDADeviceBuiltinSurfaceDeviceType())
399 return Ty;
400 } else if (T->isCUDADeviceBuiltinTextureType()) {
401 if (auto *Ty = CGM.getTargetCodeGenInfo()
402 .getCUDADeviceBuiltinTextureDeviceType())
403 return Ty;
404 }
405 }
406
407 // RecordTypes are cached and processed specially.
408 if (const RecordType *RT = dyn_cast<RecordType>(Ty))
409 return ConvertRecordDeclType(RT->getDecl());
410
411 // See if type is already cached.
412 llvm::DenseMap<const Type *, llvm::Type *>::iterator TCI = TypeCache.find(Ty);
413 // If type is found in map then use it. Otherwise, convert type T.
414 if (TCI != TypeCache.end())
415 return TCI->second;
416
417 // If we don't have it in the cache, convert it now.
418 llvm::Type *ResultType = nullptr;
419 switch (Ty->getTypeClass()) {
420 case Type::Record: // Handled above.
421 #define TYPE(Class, Base)
422 #define ABSTRACT_TYPE(Class, Base)
423 #define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
424 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
425 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class:
426 #include "clang/AST/TypeNodes.inc"
427 llvm_unreachable("Non-canonical or dependent types aren't possible.");
428
429 case Type::Builtin: {
430 switch (cast<BuiltinType>(Ty)->getKind()) {
431 case BuiltinType::Void:
432 case BuiltinType::ObjCId:
433 case BuiltinType::ObjCClass:
434 case BuiltinType::ObjCSel:
435 // LLVM void type can only be used as the result of a function call. Just
436 // map to the same as char.
437 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
438 break;
439
440 case BuiltinType::Bool:
441 // Note that we always return bool as i1 for use as a scalar type.
442 ResultType = llvm::Type::getInt1Ty(getLLVMContext());
443 break;
444
445 case BuiltinType::Char_S:
446 case BuiltinType::Char_U:
447 case BuiltinType::SChar:
448 case BuiltinType::UChar:
449 case BuiltinType::Short:
450 case BuiltinType::UShort:
451 case BuiltinType::Int:
452 case BuiltinType::UInt:
453 case BuiltinType::Long:
454 case BuiltinType::ULong:
455 case BuiltinType::LongLong:
456 case BuiltinType::ULongLong:
457 case BuiltinType::WChar_S:
458 case BuiltinType::WChar_U:
459 case BuiltinType::Char8:
460 case BuiltinType::Char16:
461 case BuiltinType::Char32:
462 case BuiltinType::ShortAccum:
463 case BuiltinType::Accum:
464 case BuiltinType::LongAccum:
465 case BuiltinType::UShortAccum:
466 case BuiltinType::UAccum:
467 case BuiltinType::ULongAccum:
468 case BuiltinType::ShortFract:
469 case BuiltinType::Fract:
470 case BuiltinType::LongFract:
471 case BuiltinType::UShortFract:
472 case BuiltinType::UFract:
473 case BuiltinType::ULongFract:
474 case BuiltinType::SatShortAccum:
475 case BuiltinType::SatAccum:
476 case BuiltinType::SatLongAccum:
477 case BuiltinType::SatUShortAccum:
478 case BuiltinType::SatUAccum:
479 case BuiltinType::SatULongAccum:
480 case BuiltinType::SatShortFract:
481 case BuiltinType::SatFract:
482 case BuiltinType::SatLongFract:
483 case BuiltinType::SatUShortFract:
484 case BuiltinType::SatUFract:
485 case BuiltinType::SatULongFract:
486 ResultType = llvm::IntegerType::get(getLLVMContext(),
487 static_cast<unsigned>(Context.getTypeSize(T)));
488 break;
489
490 case BuiltinType::Float16:
491 ResultType =
492 getTypeForFormat(getLLVMContext(), Context.getFloatTypeSemantics(T),
493 /* UseNativeHalf = */ true);
494 break;
495
496 case BuiltinType::Half:
497 // Half FP can either be storage-only (lowered to i16) or native.
498 ResultType = getTypeForFormat(
499 getLLVMContext(), Context.getFloatTypeSemantics(T),
500 Context.getLangOpts().NativeHalfType ||
501 !Context.getTargetInfo().useFP16ConversionIntrinsics());
502 break;
503 case BuiltinType::BFloat16:
504 case BuiltinType::Float:
505 case BuiltinType::Double:
506 case BuiltinType::LongDouble:
507 case BuiltinType::Float128:
508 ResultType = getTypeForFormat(getLLVMContext(),
509 Context.getFloatTypeSemantics(T),
510 /* UseNativeHalf = */ false);
511 break;
512
513 case BuiltinType::NullPtr:
514 // Model std::nullptr_t as i8*
515 ResultType = llvm::Type::getInt8PtrTy(getLLVMContext());
516 break;
517
518 case BuiltinType::UInt128:
519 case BuiltinType::Int128:
520 ResultType = llvm::IntegerType::get(getLLVMContext(), 128);
521 break;
522
523 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
524 case BuiltinType::Id:
525 #include "clang/Basic/OpenCLImageTypes.def"
526 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
527 case BuiltinType::Id:
528 #include "clang/Basic/OpenCLExtensionTypes.def"
529 case BuiltinType::OCLSampler:
530 case BuiltinType::OCLEvent:
531 case BuiltinType::OCLClkEvent:
532 case BuiltinType::OCLQueue:
533 case BuiltinType::OCLReserveID:
534 ResultType = CGM.getOpenCLRuntime().convertOpenCLSpecificType(Ty);
535 break;
536 case BuiltinType::SveInt8:
537 case BuiltinType::SveUint8:
538 case BuiltinType::SveInt8x2:
539 case BuiltinType::SveUint8x2:
540 case BuiltinType::SveInt8x3:
541 case BuiltinType::SveUint8x3:
542 case BuiltinType::SveInt8x4:
543 case BuiltinType::SveUint8x4:
544 case BuiltinType::SveInt16:
545 case BuiltinType::SveUint16:
546 case BuiltinType::SveInt16x2:
547 case BuiltinType::SveUint16x2:
548 case BuiltinType::SveInt16x3:
549 case BuiltinType::SveUint16x3:
550 case BuiltinType::SveInt16x4:
551 case BuiltinType::SveUint16x4:
552 case BuiltinType::SveInt32:
553 case BuiltinType::SveUint32:
554 case BuiltinType::SveInt32x2:
555 case BuiltinType::SveUint32x2:
556 case BuiltinType::SveInt32x3:
557 case BuiltinType::SveUint32x3:
558 case BuiltinType::SveInt32x4:
559 case BuiltinType::SveUint32x4:
560 case BuiltinType::SveInt64:
561 case BuiltinType::SveUint64:
562 case BuiltinType::SveInt64x2:
563 case BuiltinType::SveUint64x2:
564 case BuiltinType::SveInt64x3:
565 case BuiltinType::SveUint64x3:
566 case BuiltinType::SveInt64x4:
567 case BuiltinType::SveUint64x4:
568 case BuiltinType::SveBool:
569 case BuiltinType::SveFloat16:
570 case BuiltinType::SveFloat16x2:
571 case BuiltinType::SveFloat16x3:
572 case BuiltinType::SveFloat16x4:
573 case BuiltinType::SveFloat32:
574 case BuiltinType::SveFloat32x2:
575 case BuiltinType::SveFloat32x3:
576 case BuiltinType::SveFloat32x4:
577 case BuiltinType::SveFloat64:
578 case BuiltinType::SveFloat64x2:
579 case BuiltinType::SveFloat64x3:
580 case BuiltinType::SveFloat64x4:
581 case BuiltinType::SveBFloat16:
582 case BuiltinType::SveBFloat16x2:
583 case BuiltinType::SveBFloat16x3:
584 case BuiltinType::SveBFloat16x4: {
585 ASTContext::BuiltinVectorTypeInfo Info =
586 Context.getBuiltinVectorTypeInfo(cast<BuiltinType>(Ty));
587 return llvm::ScalableVectorType::get(ConvertType(Info.ElementType),
588 Info.EC.Min * Info.NumVectors);
589 }
590 case BuiltinType::Dependent:
591 #define BUILTIN_TYPE(Id, SingletonId)
592 #define PLACEHOLDER_TYPE(Id, SingletonId) \
593 case BuiltinType::Id:
594 #include "clang/AST/BuiltinTypes.def"
595 llvm_unreachable("Unexpected placeholder builtin type!");
596 }
597 break;
598 }
599 case Type::Auto:
600 case Type::DeducedTemplateSpecialization:
601 llvm_unreachable("Unexpected undeduced type!");
602 case Type::Complex: {
603 llvm::Type *EltTy = ConvertType(cast<ComplexType>(Ty)->getElementType());
604 ResultType = llvm::StructType::get(EltTy, EltTy);
605 break;
606 }
607 case Type::LValueReference:
608 case Type::RValueReference: {
609 const ReferenceType *RTy = cast<ReferenceType>(Ty);
610 QualType ETy = RTy->getPointeeType();
611 llvm::Type *PointeeType = ConvertTypeForMem(ETy);
612 unsigned AS = Context.getTargetAddressSpace(ETy);
613 ResultType = llvm::PointerType::get(PointeeType, AS);
614 break;
615 }
616 case Type::Pointer: {
617 const PointerType *PTy = cast<PointerType>(Ty);
618 QualType ETy = PTy->getPointeeType();
619 llvm::Type *PointeeType = ConvertTypeForMem(ETy);
620 if (PointeeType->isVoidTy())
621 PointeeType = llvm::Type::getInt8Ty(getLLVMContext());
622
623 unsigned AS = PointeeType->isFunctionTy()
624 ? getDataLayout().getProgramAddressSpace()
625 : Context.getTargetAddressSpace(ETy);
626
627 ResultType = llvm::PointerType::get(PointeeType, AS);
628 break;
629 }
630
631 case Type::VariableArray: {
632 const VariableArrayType *A = cast<VariableArrayType>(Ty);
633 assert(A->getIndexTypeCVRQualifiers() == 0 &&
634 "FIXME: We only handle trivial array types so far!");
635 // VLAs resolve to the innermost element type; this matches
636 // the return of alloca, and there isn't any obviously better choice.
637 ResultType = ConvertTypeForMem(A->getElementType());
638 break;
639 }
640 case Type::IncompleteArray: {
641 const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty);
642 assert(A->getIndexTypeCVRQualifiers() == 0 &&
643 "FIXME: We only handle trivial array types so far!");
644 // int X[] -> [0 x int], unless the element type is not sized. If it is
645 // unsized (e.g. an incomplete struct) just use [0 x i8].
646 ResultType = ConvertTypeForMem(A->getElementType());
647 if (!ResultType->isSized()) {
648 SkippedLayout = true;
649 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
650 }
651 ResultType = llvm::ArrayType::get(ResultType, 0);
652 break;
653 }
654 case Type::ConstantArray: {
655 const ConstantArrayType *A = cast<ConstantArrayType>(Ty);
656 llvm::Type *EltTy = ConvertTypeForMem(A->getElementType());
657
658 // Lower arrays of undefined struct type to arrays of i8 just to have a
659 // concrete type.
660 if (!EltTy->isSized()) {
661 SkippedLayout = true;
662 EltTy = llvm::Type::getInt8Ty(getLLVMContext());
663 }
664
665 ResultType = llvm::ArrayType::get(EltTy, A->getSize().getZExtValue());
666 break;
667 }
668 case Type::ExtVector:
669 case Type::Vector: {
670 const VectorType *VT = cast<VectorType>(Ty);
671 ResultType = llvm::FixedVectorType::get(ConvertType(VT->getElementType()),
672 VT->getNumElements());
673 break;
674 }
675 case Type::ConstantMatrix: {
676 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty);
677 ResultType =
678 llvm::FixedVectorType::get(ConvertType(MT->getElementType()),
679 MT->getNumRows() * MT->getNumColumns());
680 break;
681 }
682 case Type::FunctionNoProto:
683 case Type::FunctionProto:
684 ResultType = ConvertFunctionTypeInternal(T);
685 break;
686 case Type::ObjCObject:
687 ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType());
688 break;
689
690 case Type::ObjCInterface: {
691 // Objective-C interfaces are always opaque (outside of the
692 // runtime, which can do whatever it likes); we never refine
693 // these.
694 llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)];
695 if (!T)
696 T = llvm::StructType::create(getLLVMContext());
697 ResultType = T;
698 break;
699 }
700
701 case Type::ObjCObjectPointer: {
702 // Protocol qualifications do not influence the LLVM type, we just return a
703 // pointer to the underlying interface type. We don't need to worry about
704 // recursive conversion.
705 llvm::Type *T =
706 ConvertTypeForMem(cast<ObjCObjectPointerType>(Ty)->getPointeeType());
707 ResultType = T->getPointerTo();
708 break;
709 }
710
711 case Type::Enum: {
712 const EnumDecl *ED = cast<EnumType>(Ty)->getDecl();
713 if (ED->isCompleteDefinition() || ED->isFixed())
714 return ConvertType(ED->getIntegerType());
715 // Return a placeholder 'i32' type. This can be changed later when the
716 // type is defined (see UpdateCompletedType), but is likely to be the
717 // "right" answer.
718 ResultType = llvm::Type::getInt32Ty(getLLVMContext());
719 break;
720 }
721
722 case Type::BlockPointer: {
723 const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType();
724 llvm::Type *PointeeType = CGM.getLangOpts().OpenCL
725 ? CGM.getGenericBlockLiteralType()
726 : ConvertTypeForMem(FTy);
727 unsigned AS = Context.getTargetAddressSpace(FTy);
728 ResultType = llvm::PointerType::get(PointeeType, AS);
729 break;
730 }
731
732 case Type::MemberPointer: {
733 auto *MPTy = cast<MemberPointerType>(Ty);
734 if (!getCXXABI().isMemberPointerConvertible(MPTy)) {
735 RecordsWithOpaqueMemberPointers.insert(MPTy->getClass());
736 ResultType = llvm::StructType::create(getLLVMContext());
737 } else {
738 ResultType = getCXXABI().ConvertMemberPointerType(MPTy);
739 }
740 break;
741 }
742
743 case Type::Atomic: {
744 QualType valueType = cast<AtomicType>(Ty)->getValueType();
745 ResultType = ConvertTypeForMem(valueType);
746
747 // Pad out to the inflated size if necessary.
748 uint64_t valueSize = Context.getTypeSize(valueType);
749 uint64_t atomicSize = Context.getTypeSize(Ty);
750 if (valueSize != atomicSize) {
751 assert(valueSize < atomicSize);
752 llvm::Type *elts[] = {
753 ResultType,
754 llvm::ArrayType::get(CGM.Int8Ty, (atomicSize - valueSize) / 8)
755 };
756 ResultType = llvm::StructType::get(getLLVMContext(),
757 llvm::makeArrayRef(elts));
758 }
759 break;
760 }
761 case Type::Pipe: {
762 ResultType = CGM.getOpenCLRuntime().getPipeType(cast<PipeType>(Ty));
763 break;
764 }
765 case Type::ExtInt: {
766 const auto &EIT = cast<ExtIntType>(Ty);
767 ResultType = llvm::Type::getIntNTy(getLLVMContext(), EIT->getNumBits());
768 break;
769 }
770 }
771
772 assert(ResultType && "Didn't convert a type?");
773
774 TypeCache[Ty] = ResultType;
775 return ResultType;
776 }
777
isPaddedAtomicType(QualType type)778 bool CodeGenModule::isPaddedAtomicType(QualType type) {
779 return isPaddedAtomicType(type->castAs<AtomicType>());
780 }
781
isPaddedAtomicType(const AtomicType * type)782 bool CodeGenModule::isPaddedAtomicType(const AtomicType *type) {
783 return Context.getTypeSize(type) != Context.getTypeSize(type->getValueType());
784 }
785
786 /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
ConvertRecordDeclType(const RecordDecl * RD)787 llvm::StructType *CodeGenTypes::ConvertRecordDeclType(const RecordDecl *RD) {
788 // TagDecl's are not necessarily unique, instead use the (clang)
789 // type connected to the decl.
790 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
791
792 llvm::StructType *&Entry = RecordDeclTypes[Key];
793
794 // If we don't have a StructType at all yet, create the forward declaration.
795 if (!Entry) {
796 Entry = llvm::StructType::create(getLLVMContext());
797 addRecordTypeName(RD, Entry, "");
798 }
799 llvm::StructType *Ty = Entry;
800
801 // If this is still a forward declaration, or the LLVM type is already
802 // complete, there's nothing more to do.
803 RD = RD->getDefinition();
804 if (!RD || !RD->isCompleteDefinition() || !Ty->isOpaque())
805 return Ty;
806
807 // If converting this type would cause us to infinitely loop, don't do it!
808 if (!isSafeToConvert(RD, *this)) {
809 DeferredRecords.push_back(RD);
810 return Ty;
811 }
812
813 // Okay, this is a definition of a type. Compile the implementation now.
814 bool InsertResult = RecordsBeingLaidOut.insert(Key).second;
815 (void)InsertResult;
816 assert(InsertResult && "Recursively compiling a struct?");
817
818 // Force conversion of non-virtual base classes recursively.
819 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
820 for (const auto &I : CRD->bases()) {
821 if (I.isVirtual()) continue;
822 ConvertRecordDeclType(I.getType()->castAs<RecordType>()->getDecl());
823 }
824 }
825
826 // Layout fields.
827 std::unique_ptr<CGRecordLayout> Layout = ComputeRecordLayout(RD, Ty);
828 CGRecordLayouts[Key] = std::move(Layout);
829
830 // We're done laying out this struct.
831 bool EraseResult = RecordsBeingLaidOut.erase(Key); (void)EraseResult;
832 assert(EraseResult && "struct not in RecordsBeingLaidOut set?");
833
834 // If this struct blocked a FunctionType conversion, then recompute whatever
835 // was derived from that.
836 // FIXME: This is hugely overconservative.
837 if (SkippedLayout)
838 TypeCache.clear();
839
840 // If we're done converting the outer-most record, then convert any deferred
841 // structs as well.
842 if (RecordsBeingLaidOut.empty())
843 while (!DeferredRecords.empty())
844 ConvertRecordDeclType(DeferredRecords.pop_back_val());
845
846 return Ty;
847 }
848
849 /// getCGRecordLayout - Return record layout info for the given record decl.
850 const CGRecordLayout &
getCGRecordLayout(const RecordDecl * RD)851 CodeGenTypes::getCGRecordLayout(const RecordDecl *RD) {
852 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
853
854 auto I = CGRecordLayouts.find(Key);
855 if (I != CGRecordLayouts.end())
856 return *I->second;
857 // Compute the type information.
858 ConvertRecordDeclType(RD);
859
860 // Now try again.
861 I = CGRecordLayouts.find(Key);
862
863 assert(I != CGRecordLayouts.end() &&
864 "Unable to find record layout information for type");
865 return *I->second;
866 }
867
isPointerZeroInitializable(QualType T)868 bool CodeGenTypes::isPointerZeroInitializable(QualType T) {
869 assert((T->isAnyPointerType() || T->isBlockPointerType()) && "Invalid type");
870 return isZeroInitializable(T);
871 }
872
isZeroInitializable(QualType T)873 bool CodeGenTypes::isZeroInitializable(QualType T) {
874 if (T->getAs<PointerType>())
875 return Context.getTargetNullPointerValue(T) == 0;
876
877 if (const auto *AT = Context.getAsArrayType(T)) {
878 if (isa<IncompleteArrayType>(AT))
879 return true;
880 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
881 if (Context.getConstantArrayElementCount(CAT) == 0)
882 return true;
883 T = Context.getBaseElementType(T);
884 }
885
886 // Records are non-zero-initializable if they contain any
887 // non-zero-initializable subobjects.
888 if (const RecordType *RT = T->getAs<RecordType>()) {
889 const RecordDecl *RD = RT->getDecl();
890 return isZeroInitializable(RD);
891 }
892
893 // We have to ask the ABI about member pointers.
894 if (const MemberPointerType *MPT = T->getAs<MemberPointerType>())
895 return getCXXABI().isZeroInitializable(MPT);
896
897 // Everything else is okay.
898 return true;
899 }
900
isZeroInitializable(const RecordDecl * RD)901 bool CodeGenTypes::isZeroInitializable(const RecordDecl *RD) {
902 return getCGRecordLayout(RD).isZeroInitializable();
903 }
904