clang 19.0.0git
CodeGenTypes.cpp
Go to the documentation of this file.
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"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/Expr.h"
25#include "llvm/IR/DataLayout.h"
26#include "llvm/IR/DerivedTypes.h"
27#include "llvm/IR/Module.h"
28
29using namespace clang;
30using namespace CodeGen;
31
33 : CGM(cgm), Context(cgm.getContext()), TheModule(cgm.getModule()),
34 Target(cgm.getTarget()), TheCXXABI(cgm.getCXXABI()),
35 TheABIInfo(cgm.getTargetCodeGenInfo().getABIInfo()) {
36 SkippedLayout = false;
37 LongDoubleReferenced = false;
38}
39
41 for (llvm::FoldingSet<CGFunctionInfo>::iterator
42 I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; )
43 delete &*I++;
44}
45
47 return CGM.getCodeGenOpts();
48}
49
51 llvm::StructType *Ty,
52 StringRef suffix) {
54 llvm::raw_svector_ostream OS(TypeName);
55 OS << RD->getKindName() << '.';
56
57 // FIXME: We probably want to make more tweaks to the printing policy. For
58 // example, we should probably enable PrintCanonicalTypes and
59 // FullyQualifiedNames.
61 Policy.SuppressInlineNamespace = false;
62
63 // Name the codegen type after the typedef name
64 // if there is no tag type name available
65 if (RD->getIdentifier()) {
66 // FIXME: We should not have to check for a null decl context here.
67 // Right now we do it because the implicit Obj-C decls don't have one.
68 if (RD->getDeclContext())
69 RD->printQualifiedName(OS, Policy);
70 else
71 RD->printName(OS, Policy);
72 } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) {
73 // FIXME: We should not have to check for a null decl context here.
74 // Right now we do it because the implicit Obj-C decls don't have one.
75 if (TDD->getDeclContext())
76 TDD->printQualifiedName(OS, Policy);
77 else
78 TDD->printName(OS);
79 } else
80 OS << "anon";
81
82 if (!suffix.empty())
83 OS << suffix;
84
85 Ty->setName(OS.str());
86}
87
88/// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
89/// ConvertType in that it is used to convert to the memory representation for
90/// a type. For example, the scalar representation for _Bool is i1, but the
91/// memory representation is usually i8 or i32, depending on the target.
92///
93/// We generally assume that the alloc size of this type under the LLVM
94/// data layout is the same as the size of the AST type. The alignment
95/// does not have to match: Clang should always use explicit alignments
96/// and packed structs as necessary to produce the layout it needs.
97/// But the size does need to be exactly right or else things like struct
98/// layout will break.
100 if (T->isConstantMatrixType()) {
101 const Type *Ty = Context.getCanonicalType(T).getTypePtr();
102 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty);
103 return llvm::ArrayType::get(ConvertType(MT->getElementType()),
104 MT->getNumRows() * MT->getNumColumns());
105 }
106
107 llvm::Type *R = ConvertType(T);
108
109 // Check for the boolean vector case.
110 if (T->isExtVectorBoolType()) {
111 auto *FixedVT = cast<llvm::FixedVectorType>(R);
112 // Pad to at least one byte.
113 uint64_t BytePadded = std::max<uint64_t>(FixedVT->getNumElements(), 8);
114 return llvm::IntegerType::get(FixedVT->getContext(), BytePadded);
115 }
116
117 // If T is _Bool or a _BitInt type, ConvertType will produce an IR type
118 // with the exact semantic bit-width of the AST type; for example,
119 // _BitInt(17) will turn into i17. In memory, however, we need to store
120 // such values extended to their full storage size as decided by AST
121 // layout; this is an ABI requirement. Ideally, we would always use an
122 // integer type that's just the bit-size of the AST type; for example, if
123 // sizeof(_BitInt(17)) == 4, _BitInt(17) would turn into i32. That is what's
124 // returned by convertTypeForLoadStore. However, that type does not
125 // always satisfy the size requirement on memory representation types
126 // describe above. For example, a 32-bit platform might reasonably set
127 // sizeof(_BitInt(65)) == 12, but i96 is likely to have to have an alloc size
128 // of 16 bytes in the LLVM data layout. In these cases, we simply return
129 // a byte array of the appropriate size.
130 if (T->isBitIntType()) {
132 return llvm::ArrayType::get(CGM.Int8Ty,
133 Context.getTypeSizeInChars(T).getQuantity());
134 return llvm::IntegerType::get(getLLVMContext(),
135 (unsigned)Context.getTypeSize(T));
136 }
137
138 if (R->isIntegerTy(1))
139 return llvm::IntegerType::get(getLLVMContext(),
140 (unsigned)Context.getTypeSize(T));
141
142 // Else, don't map it.
143 return R;
144}
145
147 llvm::Type *LLVMTy) {
148 if (!LLVMTy)
149 LLVMTy = ConvertType(ASTTy);
150
151 CharUnits ASTSize = Context.getTypeSizeInChars(ASTTy);
152 CharUnits LLVMSize =
154 return ASTSize != LLVMSize;
155}
156
158 llvm::Type *LLVMTy) {
159 if (!LLVMTy)
160 LLVMTy = ConvertType(T);
161
162 if (T->isBitIntType())
163 return llvm::Type::getIntNTy(
165
166 if (LLVMTy->isIntegerTy(1))
167 return llvm::IntegerType::get(getLLVMContext(),
168 (unsigned)Context.getTypeSize(T));
169
170 if (T->isExtVectorBoolType())
171 return ConvertTypeForMem(T);
172
173 return LLVMTy;
174}
175
176/// isRecordLayoutComplete - Return true if the specified type is already
177/// completely laid out.
179 llvm::DenseMap<const Type*, llvm::StructType *>::const_iterator I =
180 RecordDeclTypes.find(Ty);
181 return I != RecordDeclTypes.end() && !I->second->isOpaque();
182}
183
184/// isFuncParamTypeConvertible - Return true if the specified type in a
185/// function parameter or result position can be converted to an IR type at this
186/// point. This boils down to being whether it is complete.
188 // Some ABIs cannot have their member pointers represented in IR unless
189 // certain circumstances have been reached.
190 if (const auto *MPT = Ty->getAs<MemberPointerType>())
192
193 // If this isn't a tagged type, we can convert it!
194 const TagType *TT = Ty->getAs<TagType>();
195 if (!TT) return true;
196
197 // Incomplete types cannot be converted.
198 return !TT->isIncompleteType();
199}
200
201
202/// Code to verify a given function type is complete, i.e. the return type
203/// and all of the parameter types are complete. Also check to see if we are in
204/// a RS_StructPointer context, and if so whether any struct types have been
205/// pended. If so, we don't want to ask the ABI lowering code to handle a type
206/// that cannot be converted to an IR type.
209 return false;
210
211 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
212 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
213 if (!isFuncParamTypeConvertible(FPT->getParamType(i)))
214 return false;
215
216 return true;
217}
218
219/// UpdateCompletedType - When we find the full definition for a TagDecl,
220/// replace the 'opaque' type we previously made for it if applicable.
222 // If this is an enum being completed, then we flush all non-struct types from
223 // the cache. This allows function types and other things that may be derived
224 // from the enum to be recomputed.
225 if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) {
226 // Only flush the cache if we've actually already converted this type.
227 if (TypeCache.count(ED->getTypeForDecl())) {
228 // Okay, we formed some types based on this. We speculated that the enum
229 // would be lowered to i32, so we only need to flush the cache if this
230 // didn't happen.
231 if (!ConvertType(ED->getIntegerType())->isIntegerTy(32))
232 TypeCache.clear();
233 }
234 // If necessary, provide the full definition of a type only used with a
235 // declaration so far.
236 if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
237 DI->completeType(ED);
238 return;
239 }
240
241 // If we completed a RecordDecl that we previously used and converted to an
242 // anonymous type, then go ahead and complete it now.
243 const RecordDecl *RD = cast<RecordDecl>(TD);
244 if (RD->isDependentType()) return;
245
246 // Only complete it if we converted it already. If we haven't converted it
247 // yet, we'll just do it lazily.
248 if (RecordDeclTypes.count(Context.getTagDeclType(RD).getTypePtr()))
250
251 // If necessary, provide the full definition of a type only used with a
252 // declaration so far.
253 if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
254 DI->completeType(RD);
255}
256
258 QualType T = Context.getRecordType(RD);
259 T = Context.getCanonicalType(T);
260
261 const Type *Ty = T.getTypePtr();
262 if (RecordsWithOpaqueMemberPointers.count(Ty)) {
263 TypeCache.clear();
264 RecordsWithOpaqueMemberPointers.clear();
265 }
266}
267
268static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext,
269 const llvm::fltSemantics &format,
270 bool UseNativeHalf = false) {
271 if (&format == &llvm::APFloat::IEEEhalf()) {
272 if (UseNativeHalf)
273 return llvm::Type::getHalfTy(VMContext);
274 else
275 return llvm::Type::getInt16Ty(VMContext);
276 }
277 if (&format == &llvm::APFloat::BFloat())
278 return llvm::Type::getBFloatTy(VMContext);
279 if (&format == &llvm::APFloat::IEEEsingle())
280 return llvm::Type::getFloatTy(VMContext);
281 if (&format == &llvm::APFloat::IEEEdouble())
282 return llvm::Type::getDoubleTy(VMContext);
283 if (&format == &llvm::APFloat::IEEEquad())
284 return llvm::Type::getFP128Ty(VMContext);
285 if (&format == &llvm::APFloat::PPCDoubleDouble())
286 return llvm::Type::getPPC_FP128Ty(VMContext);
287 if (&format == &llvm::APFloat::x87DoubleExtended())
288 return llvm::Type::getX86_FP80Ty(VMContext);
289 llvm_unreachable("Unknown float format!");
290}
291
292llvm::Type *CodeGenTypes::ConvertFunctionTypeInternal(QualType QFT) {
293 assert(QFT.isCanonical());
294 const FunctionType *FT = cast<FunctionType>(QFT.getTypePtr());
295 // First, check whether we can build the full function type. If the
296 // function type depends on an incomplete type (e.g. a struct or enum), we
297 // cannot lower the function type.
298 if (!isFuncTypeConvertible(FT)) {
299 // This function's type depends on an incomplete tag type.
300
301 // Force conversion of all the relevant record types, to make sure
302 // we re-convert the FunctionType when appropriate.
303 if (const RecordType *RT = FT->getReturnType()->getAs<RecordType>())
304 ConvertRecordDeclType(RT->getDecl());
305 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT))
306 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++)
307 if (const RecordType *RT = FPT->getParamType(i)->getAs<RecordType>())
308 ConvertRecordDeclType(RT->getDecl());
309
310 SkippedLayout = true;
311
312 // Return a placeholder type.
313 return llvm::StructType::get(getLLVMContext());
314 }
315
316 // The function type can be built; call the appropriate routines to
317 // build it.
318 const CGFunctionInfo *FI;
319 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) {
322 } else {
323 const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(FT);
326 }
327
328 llvm::Type *ResultType = nullptr;
329 // If there is something higher level prodding our CGFunctionInfo, then
330 // don't recurse into it again.
331 if (FunctionsBeingProcessed.count(FI)) {
332
333 ResultType = llvm::StructType::get(getLLVMContext());
334 SkippedLayout = true;
335 } else {
336
337 // Otherwise, we're good to go, go ahead and convert it.
338 ResultType = GetFunctionType(*FI);
339 }
340
341 return ResultType;
342}
343
344/// ConvertType - Convert the specified type to its LLVM form.
346 T = Context.getCanonicalType(T);
347
348 const Type *Ty = T.getTypePtr();
349
350 // For the device-side compilation, CUDA device builtin surface/texture types
351 // may be represented in different types.
352 if (Context.getLangOpts().CUDAIsDevice) {
354 if (auto *Ty = CGM.getTargetCodeGenInfo()
356 return Ty;
357 } else if (T->isCUDADeviceBuiltinTextureType()) {
358 if (auto *Ty = CGM.getTargetCodeGenInfo()
360 return Ty;
361 }
362 }
363
364 // RecordTypes are cached and processed specially.
365 if (const RecordType *RT = dyn_cast<RecordType>(Ty))
366 return ConvertRecordDeclType(RT->getDecl());
367
368 llvm::Type *CachedType = nullptr;
369 auto TCI = TypeCache.find(Ty);
370 if (TCI != TypeCache.end())
371 CachedType = TCI->second;
372 // With expensive checks, check that the type we compute matches the
373 // cached type.
374#ifndef EXPENSIVE_CHECKS
375 if (CachedType)
376 return CachedType;
377#endif
378
379 // If we don't have it in the cache, convert it now.
380 llvm::Type *ResultType = nullptr;
381 switch (Ty->getTypeClass()) {
382 case Type::Record: // Handled above.
383#define TYPE(Class, Base)
384#define ABSTRACT_TYPE(Class, Base)
385#define NON_CANONICAL_TYPE(Class, Base) case Type::Class:
386#define DEPENDENT_TYPE(Class, Base) case Type::Class:
387#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class:
388#include "clang/AST/TypeNodes.inc"
389 llvm_unreachable("Non-canonical or dependent types aren't possible.");
390
391 case Type::Builtin: {
392 switch (cast<BuiltinType>(Ty)->getKind()) {
393 case BuiltinType::Void:
394 case BuiltinType::ObjCId:
395 case BuiltinType::ObjCClass:
396 case BuiltinType::ObjCSel:
397 // LLVM void type can only be used as the result of a function call. Just
398 // map to the same as char.
399 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
400 break;
401
402 case BuiltinType::Bool:
403 // Note that we always return bool as i1 for use as a scalar type.
404 ResultType = llvm::Type::getInt1Ty(getLLVMContext());
405 break;
406
407 case BuiltinType::Char_S:
408 case BuiltinType::Char_U:
409 case BuiltinType::SChar:
410 case BuiltinType::UChar:
411 case BuiltinType::Short:
412 case BuiltinType::UShort:
413 case BuiltinType::Int:
414 case BuiltinType::UInt:
415 case BuiltinType::Long:
416 case BuiltinType::ULong:
417 case BuiltinType::LongLong:
418 case BuiltinType::ULongLong:
419 case BuiltinType::WChar_S:
420 case BuiltinType::WChar_U:
421 case BuiltinType::Char8:
422 case BuiltinType::Char16:
423 case BuiltinType::Char32:
424 case BuiltinType::ShortAccum:
425 case BuiltinType::Accum:
426 case BuiltinType::LongAccum:
427 case BuiltinType::UShortAccum:
428 case BuiltinType::UAccum:
429 case BuiltinType::ULongAccum:
430 case BuiltinType::ShortFract:
431 case BuiltinType::Fract:
432 case BuiltinType::LongFract:
433 case BuiltinType::UShortFract:
434 case BuiltinType::UFract:
435 case BuiltinType::ULongFract:
436 case BuiltinType::SatShortAccum:
437 case BuiltinType::SatAccum:
438 case BuiltinType::SatLongAccum:
439 case BuiltinType::SatUShortAccum:
440 case BuiltinType::SatUAccum:
441 case BuiltinType::SatULongAccum:
442 case BuiltinType::SatShortFract:
443 case BuiltinType::SatFract:
444 case BuiltinType::SatLongFract:
445 case BuiltinType::SatUShortFract:
446 case BuiltinType::SatUFract:
447 case BuiltinType::SatULongFract:
448 ResultType = llvm::IntegerType::get(getLLVMContext(),
449 static_cast<unsigned>(Context.getTypeSize(T)));
450 break;
451
452 case BuiltinType::Float16:
453 ResultType =
455 /* UseNativeHalf = */ true);
456 break;
457
458 case BuiltinType::Half:
459 // Half FP can either be storage-only (lowered to i16) or native.
460 ResultType = getTypeForFormat(
462 Context.getLangOpts().NativeHalfType ||
464 break;
465 case BuiltinType::LongDouble:
466 LongDoubleReferenced = true;
467 [[fallthrough]];
468 case BuiltinType::BFloat16:
469 case BuiltinType::Float:
470 case BuiltinType::Double:
471 case BuiltinType::Float128:
472 case BuiltinType::Ibm128:
473 ResultType = getTypeForFormat(getLLVMContext(),
474 Context.getFloatTypeSemantics(T),
475 /* UseNativeHalf = */ false);
476 break;
477
478 case BuiltinType::NullPtr:
479 // Model std::nullptr_t as i8*
480 ResultType = llvm::PointerType::getUnqual(getLLVMContext());
481 break;
482
483 case BuiltinType::UInt128:
484 case BuiltinType::Int128:
485 ResultType = llvm::IntegerType::get(getLLVMContext(), 128);
486 break;
487
488#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
489 case BuiltinType::Id:
490#include "clang/Basic/OpenCLImageTypes.def"
491#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
492 case BuiltinType::Id:
493#include "clang/Basic/OpenCLExtensionTypes.def"
494 case BuiltinType::OCLSampler:
495 case BuiltinType::OCLEvent:
496 case BuiltinType::OCLClkEvent:
497 case BuiltinType::OCLQueue:
498 case BuiltinType::OCLReserveID:
499 ResultType = CGM.getOpenCLRuntime().convertOpenCLSpecificType(Ty);
500 break;
501 case BuiltinType::SveInt8:
502 case BuiltinType::SveUint8:
503 case BuiltinType::SveInt8x2:
504 case BuiltinType::SveUint8x2:
505 case BuiltinType::SveInt8x3:
506 case BuiltinType::SveUint8x3:
507 case BuiltinType::SveInt8x4:
508 case BuiltinType::SveUint8x4:
509 case BuiltinType::SveInt16:
510 case BuiltinType::SveUint16:
511 case BuiltinType::SveInt16x2:
512 case BuiltinType::SveUint16x2:
513 case BuiltinType::SveInt16x3:
514 case BuiltinType::SveUint16x3:
515 case BuiltinType::SveInt16x4:
516 case BuiltinType::SveUint16x4:
517 case BuiltinType::SveInt32:
518 case BuiltinType::SveUint32:
519 case BuiltinType::SveInt32x2:
520 case BuiltinType::SveUint32x2:
521 case BuiltinType::SveInt32x3:
522 case BuiltinType::SveUint32x3:
523 case BuiltinType::SveInt32x4:
524 case BuiltinType::SveUint32x4:
525 case BuiltinType::SveInt64:
526 case BuiltinType::SveUint64:
527 case BuiltinType::SveInt64x2:
528 case BuiltinType::SveUint64x2:
529 case BuiltinType::SveInt64x3:
530 case BuiltinType::SveUint64x3:
531 case BuiltinType::SveInt64x4:
532 case BuiltinType::SveUint64x4:
533 case BuiltinType::SveBool:
534 case BuiltinType::SveBoolx2:
535 case BuiltinType::SveBoolx4:
536 case BuiltinType::SveFloat16:
537 case BuiltinType::SveFloat16x2:
538 case BuiltinType::SveFloat16x3:
539 case BuiltinType::SveFloat16x4:
540 case BuiltinType::SveFloat32:
541 case BuiltinType::SveFloat32x2:
542 case BuiltinType::SveFloat32x3:
543 case BuiltinType::SveFloat32x4:
544 case BuiltinType::SveFloat64:
545 case BuiltinType::SveFloat64x2:
546 case BuiltinType::SveFloat64x3:
547 case BuiltinType::SveFloat64x4:
548 case BuiltinType::SveBFloat16:
549 case BuiltinType::SveBFloat16x2:
550 case BuiltinType::SveBFloat16x3:
551 case BuiltinType::SveBFloat16x4: {
553 Context.getBuiltinVectorTypeInfo(cast<BuiltinType>(Ty));
554 return llvm::ScalableVectorType::get(ConvertType(Info.ElementType),
555 Info.EC.getKnownMinValue() *
556 Info.NumVectors);
557 }
558 case BuiltinType::SveCount:
559 return llvm::TargetExtType::get(getLLVMContext(), "aarch64.svcount");
560#define PPC_VECTOR_TYPE(Name, Id, Size) \
561 case BuiltinType::Id: \
562 ResultType = \
563 llvm::FixedVectorType::get(ConvertType(Context.BoolTy), Size); \
564 break;
565#include "clang/Basic/PPCTypes.def"
566#define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
567#include "clang/Basic/RISCVVTypes.def"
568 {
570 Context.getBuiltinVectorTypeInfo(cast<BuiltinType>(Ty));
571 // Tuple types are expressed as aggregregate types of the same scalable
572 // vector type (e.g. vint32m1x2_t is two vint32m1_t, which is {<vscale x
573 // 2 x i32>, <vscale x 2 x i32>}).
574 if (Info.NumVectors != 1) {
575 llvm::Type *EltTy = llvm::ScalableVectorType::get(
576 ConvertType(Info.ElementType), Info.EC.getKnownMinValue());
578 return llvm::StructType::get(getLLVMContext(), EltTys);
579 }
580 return llvm::ScalableVectorType::get(ConvertType(Info.ElementType),
581 Info.EC.getKnownMinValue());
582 }
583#define WASM_REF_TYPE(Name, MangledName, Id, SingletonId, AS) \
584 case BuiltinType::Id: { \
585 if (BuiltinType::Id == BuiltinType::WasmExternRef) \
586 ResultType = CGM.getTargetCodeGenInfo().getWasmExternrefReferenceType(); \
587 else \
588 llvm_unreachable("Unexpected wasm reference builtin type!"); \
589 } break;
590#include "clang/Basic/WebAssemblyReferenceTypes.def"
591#define AMDGPU_OPAQUE_PTR_TYPE(Name, MangledName, AS, Width, Align, Id, \
592 SingletonId) \
593 case BuiltinType::Id: \
594 return llvm::PointerType::get(getLLVMContext(), AS);
595#include "clang/Basic/AMDGPUTypes.def"
596 case BuiltinType::Dependent:
597#define BUILTIN_TYPE(Id, SingletonId)
598#define PLACEHOLDER_TYPE(Id, SingletonId) \
599 case BuiltinType::Id:
600#include "clang/AST/BuiltinTypes.def"
601 llvm_unreachable("Unexpected placeholder builtin type!");
602 }
603 break;
604 }
605 case Type::Auto:
606 case Type::DeducedTemplateSpecialization:
607 llvm_unreachable("Unexpected undeduced type!");
608 case Type::Complex: {
609 llvm::Type *EltTy = ConvertType(cast<ComplexType>(Ty)->getElementType());
610 ResultType = llvm::StructType::get(EltTy, EltTy);
611 break;
612 }
613 case Type::LValueReference:
614 case Type::RValueReference: {
615 const ReferenceType *RTy = cast<ReferenceType>(Ty);
616 QualType ETy = RTy->getPointeeType();
617 unsigned AS = getTargetAddressSpace(ETy);
618 ResultType = llvm::PointerType::get(getLLVMContext(), AS);
619 break;
620 }
621 case Type::Pointer: {
622 const PointerType *PTy = cast<PointerType>(Ty);
623 QualType ETy = PTy->getPointeeType();
624 unsigned AS = getTargetAddressSpace(ETy);
625 ResultType = llvm::PointerType::get(getLLVMContext(), AS);
626 break;
627 }
628
629 case Type::VariableArray: {
630 const VariableArrayType *A = cast<VariableArrayType>(Ty);
631 assert(A->getIndexTypeCVRQualifiers() == 0 &&
632 "FIXME: We only handle trivial array types so far!");
633 // VLAs resolve to the innermost element type; this matches
634 // the return of alloca, and there isn't any obviously better choice.
635 ResultType = ConvertTypeForMem(A->getElementType());
636 break;
637 }
638 case Type::IncompleteArray: {
639 const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty);
640 assert(A->getIndexTypeCVRQualifiers() == 0 &&
641 "FIXME: We only handle trivial array types so far!");
642 // int X[] -> [0 x int], unless the element type is not sized. If it is
643 // unsized (e.g. an incomplete struct) just use [0 x i8].
644 ResultType = ConvertTypeForMem(A->getElementType());
645 if (!ResultType->isSized()) {
646 SkippedLayout = true;
647 ResultType = llvm::Type::getInt8Ty(getLLVMContext());
648 }
649 ResultType = llvm::ArrayType::get(ResultType, 0);
650 break;
651 }
652 case Type::ArrayParameter:
653 case Type::ConstantArray: {
654 const ConstantArrayType *A = cast<ConstantArrayType>(Ty);
655 llvm::Type *EltTy = ConvertTypeForMem(A->getElementType());
656
657 // Lower arrays of undefined struct type to arrays of i8 just to have a
658 // concrete type.
659 if (!EltTy->isSized()) {
660 SkippedLayout = true;
661 EltTy = llvm::Type::getInt8Ty(getLLVMContext());
662 }
663
664 ResultType = llvm::ArrayType::get(EltTy, A->getZExtSize());
665 break;
666 }
667 case Type::ExtVector:
668 case Type::Vector: {
669 const auto *VT = cast<VectorType>(Ty);
670 // An ext_vector_type of Bool is really a vector of bits.
671 llvm::Type *IRElemTy = VT->isExtVectorBoolType()
672 ? llvm::Type::getInt1Ty(getLLVMContext())
673 : ConvertType(VT->getElementType());
674 ResultType = llvm::FixedVectorType::get(IRElemTy, VT->getNumElements());
675 break;
676 }
677 case Type::ConstantMatrix: {
678 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty);
679 ResultType =
680 llvm::FixedVectorType::get(ConvertType(MT->getElementType()),
681 MT->getNumRows() * MT->getNumColumns());
682 break;
683 }
684 case Type::FunctionNoProto:
685 case Type::FunctionProto:
686 ResultType = ConvertFunctionTypeInternal(T);
687 break;
688 case Type::ObjCObject:
689 ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType());
690 break;
691
692 case Type::ObjCInterface: {
693 // Objective-C interfaces are always opaque (outside of the
694 // runtime, which can do whatever it likes); we never refine
695 // these.
696 llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)];
697 if (!T)
698 T = llvm::StructType::create(getLLVMContext());
699 ResultType = T;
700 break;
701 }
702
703 case Type::ObjCObjectPointer:
704 ResultType = llvm::PointerType::getUnqual(getLLVMContext());
705 break;
706
707 case Type::Enum: {
708 const EnumDecl *ED = cast<EnumType>(Ty)->getDecl();
709 if (ED->isCompleteDefinition() || ED->isFixed())
710 return ConvertType(ED->getIntegerType());
711 // Return a placeholder 'i32' type. This can be changed later when the
712 // type is defined (see UpdateCompletedType), but is likely to be the
713 // "right" answer.
714 ResultType = llvm::Type::getInt32Ty(getLLVMContext());
715 break;
716 }
717
718 case Type::BlockPointer: {
719 // Block pointers lower to function type. For function type,
720 // getTargetAddressSpace() returns default address space for
721 // function pointer i.e. program address space. Therefore, for block
722 // pointers, it is important to pass the pointee AST address space when
723 // calling getTargetAddressSpace(), to ensure that we get the LLVM IR
724 // address space for data pointers and not function pointers.
725 const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType();
726 unsigned AS = Context.getTargetAddressSpace(FTy.getAddressSpace());
727 ResultType = llvm::PointerType::get(getLLVMContext(), AS);
728 break;
729 }
730
731 case Type::MemberPointer: {
732 auto *MPTy = cast<MemberPointerType>(Ty);
733 if (!getCXXABI().isMemberPointerConvertible(MPTy)) {
734 auto *C = MPTy->getClass();
735 auto Insertion = RecordsWithOpaqueMemberPointers.insert({C, nullptr});
736 if (Insertion.second)
737 Insertion.first->second = llvm::StructType::create(getLLVMContext());
738 ResultType = Insertion.first->second;
739 } else {
740 ResultType = getCXXABI().ConvertMemberPointerType(MPTy);
741 }
742 break;
743 }
744
745 case Type::Atomic: {
746 QualType valueType = cast<AtomicType>(Ty)->getValueType();
747 ResultType = ConvertTypeForMem(valueType);
748
749 // Pad out to the inflated size if necessary.
750 uint64_t valueSize = Context.getTypeSize(valueType);
751 uint64_t atomicSize = Context.getTypeSize(Ty);
752 if (valueSize != atomicSize) {
753 assert(valueSize < atomicSize);
754 llvm::Type *elts[] = {
755 ResultType,
756 llvm::ArrayType::get(CGM.Int8Ty, (atomicSize - valueSize) / 8)
757 };
758 ResultType =
759 llvm::StructType::get(getLLVMContext(), llvm::ArrayRef(elts));
760 }
761 break;
762 }
763 case Type::Pipe: {
764 ResultType = CGM.getOpenCLRuntime().getPipeType(cast<PipeType>(Ty));
765 break;
766 }
767 case Type::BitInt: {
768 const auto &EIT = cast<BitIntType>(Ty);
769 ResultType = llvm::Type::getIntNTy(getLLVMContext(), EIT->getNumBits());
770 break;
771 }
772 }
773
774 assert(ResultType && "Didn't convert a type?");
775 assert((!CachedType || CachedType == ResultType) &&
776 "Cached type doesn't match computed type");
777
778 TypeCache[Ty] = ResultType;
779 return ResultType;
780}
781
783 return isPaddedAtomicType(type->castAs<AtomicType>());
784}
785
787 return Context.getTypeSize(type) != Context.getTypeSize(type->getValueType());
788}
789
790/// ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
792 // TagDecl's are not necessarily unique, instead use the (clang)
793 // type connected to the decl.
794 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
795
796 llvm::StructType *&Entry = RecordDeclTypes[Key];
797
798 // If we don't have a StructType at all yet, create the forward declaration.
799 if (!Entry) {
800 Entry = llvm::StructType::create(getLLVMContext());
801 addRecordTypeName(RD, Entry, "");
802 }
803 llvm::StructType *Ty = Entry;
804
805 // If this is still a forward declaration, or the LLVM type is already
806 // complete, there's nothing more to do.
807 RD = RD->getDefinition();
808 if (!RD || !RD->isCompleteDefinition() || !Ty->isOpaque())
809 return Ty;
810
811 // Force conversion of non-virtual base classes recursively.
812 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
813 for (const auto &I : CRD->bases()) {
814 if (I.isVirtual()) continue;
815 ConvertRecordDeclType(I.getType()->castAs<RecordType>()->getDecl());
816 }
817 }
818
819 // Layout fields.
820 std::unique_ptr<CGRecordLayout> Layout = ComputeRecordLayout(RD, Ty);
821 CGRecordLayouts[Key] = std::move(Layout);
822
823 // If this struct blocked a FunctionType conversion, then recompute whatever
824 // was derived from that.
825 // FIXME: This is hugely overconservative.
826 if (SkippedLayout)
827 TypeCache.clear();
828
829 return Ty;
830}
831
832/// getCGRecordLayout - Return record layout info for the given record decl.
833const CGRecordLayout &
835 const Type *Key = Context.getTagDeclType(RD).getTypePtr();
836
837 auto I = CGRecordLayouts.find(Key);
838 if (I != CGRecordLayouts.end())
839 return *I->second;
840 // Compute the type information.
842
843 // Now try again.
844 I = CGRecordLayouts.find(Key);
845
846 assert(I != CGRecordLayouts.end() &&
847 "Unable to find record layout information for type");
848 return *I->second;
849}
850
852 assert((T->isAnyPointerType() || T->isBlockPointerType()) && "Invalid type");
853 return isZeroInitializable(T);
854}
855
857 if (T->getAs<PointerType>())
858 return Context.getTargetNullPointerValue(T) == 0;
859
860 if (const auto *AT = Context.getAsArrayType(T)) {
861 if (isa<IncompleteArrayType>(AT))
862 return true;
863 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
864 if (Context.getConstantArrayElementCount(CAT) == 0)
865 return true;
866 T = Context.getBaseElementType(T);
867 }
868
869 // Records are non-zero-initializable if they contain any
870 // non-zero-initializable subobjects.
871 if (const RecordType *RT = T->getAs<RecordType>()) {
872 const RecordDecl *RD = RT->getDecl();
873 return isZeroInitializable(RD);
874 }
875
876 // We have to ask the ABI about member pointers.
877 if (const MemberPointerType *MPT = T->getAs<MemberPointerType>())
878 return getCXXABI().isZeroInitializable(MPT);
879
880 // Everything else is okay.
881 return true;
882}
883
886}
887
889 // Return the address space for the type. If the type is a
890 // function type without an address space qualifier, the
891 // program address space is used. Otherwise, the target picks
892 // the best address space based on the type information
893 return T->isFunctionType() && !T.hasAddressSpace()
894 ? getDataLayout().getProgramAddressSpace()
895 : getContext().getTargetAddressSpace(T.getAddressSpace());
896}
Defines the clang::ASTContext interface.
Expr * E
static llvm::Type * getTypeForFormat(llvm::LLVMContext &VMContext, const llvm::fltSemantics &format, bool UseNativeHalf=false)
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:1152
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate....
llvm::MachO::Target Target
Definition: MachO.h:51
static CharUnits getTypeAllocSize(CodeGenModule &CGM, llvm::Type *type)
BuiltinVectorTypeInfo getBuiltinVectorTypeInfo(const BuiltinType *VecTy) const
Returns the element type, element count and number of vectors (in case of tuple) for a builtin vector...
const llvm::fltSemantics & getFloatTypeSemantics(QualType T) const
Return the APFloat 'semantics' for the specified scalar floating point type.
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl.
QualType getRecordType(const RecordDecl *Decl) const
uint64_t getTargetNullPointerValue(QualType QT) const
Get target-dependent integer value for null pointer which is used for constant folding.
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2619
const LangOptions & getLangOpts() const
Definition: ASTContext.h:790
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:712
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2385
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:772
uint64_t getConstantArrayElementCount(const ConstantArrayType *CA) const
Return number of constant array elements.
unsigned getTargetAddressSpace(LangAS AS) const
QualType getElementType() const
Definition: Type.h:3552
unsigned getIndexTypeCVRQualifiers() const
Definition: Type.h:3562
Represents a C++ struct/union/class.
Definition: DeclCXX.h:258
Represents a canonical, potentially-qualified type.
Definition: CanonicalType.h:65
const T * getTypePtr() const
Retrieve the underlying type pointer, which refers to a canonical type.
Definition: CanonicalType.h:83
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:185
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
CodeGenOptions - Track various options which control how the code is optimized and passed to the back...
virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const
Return whether or not a member pointers type is convertible to an IR type.
Definition: CGCXXABI.h:213
virtual llvm::Type * ConvertMemberPointerType(const MemberPointerType *MPT)
Find the LLVM type used to represent the given member pointer type.
Definition: CGCXXABI.cpp:43
virtual bool isZeroInitializable(const MemberPointerType *MPT)
Return true if the given member pointer can be zero-initialized (in the C++ sense) with an LLVM zeroi...
Definition: CGCXXABI.cpp:123
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:58
CGFunctionInfo - Class to encapsulate the information about a function definition.
virtual llvm::Type * getPipeType(const PipeType *T, StringRef Name, llvm::Type *&PipeTy)
virtual llvm::Type * convertOpenCLSpecificType(const Type *T)
CGRecordLayout - This class handles struct and union layout info while lowering AST types to LLVM typ...
bool isZeroInitializable() const
Check whether this struct can be C++ zero-initialized with a zeroinitializer.
This class organizes the cross-function state that is used while generating LLVM code.
CGDebugInfo * getModuleDebugInfo()
bool isPaddedAtomicType(QualType type)
CGOpenCLRuntime & getOpenCLRuntime()
Return a reference to the configured OpenCL runtime.
const TargetCodeGenInfo & getTargetCodeGenInfo()
const CodeGenOptions & getCodeGenOpts() const
CodeGenTypes(CodeGenModule &cgm)
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
bool isPointerZeroInitializable(QualType T)
Check if the pointer type can be zero-initialized (in the C++ sense) with an LLVM zeroinitializer.
const CodeGenOptions & getCodeGenOpts() const
ASTContext & getContext() const
Definition: CodeGenTypes.h:108
const CGFunctionInfo & arrangeFreeFunctionType(CanQual< FunctionProtoType > Ty)
Arrange the argument and result information for a value of the given freestanding function type.
Definition: CGCall.cpp:206
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1632
bool isFuncTypeConvertible(const FunctionType *FT)
isFuncTypeConvertible - Utility to check whether a function type can be converted to an LLVM type (i....
std::unique_ptr< CGRecordLayout > ComputeRecordLayout(const RecordDecl *D, llvm::StructType *Ty)
Compute a new LLVM record layout object for the given record.
llvm::Type * convertTypeForLoadStore(QualType T, llvm::Type *LLVMTy=nullptr)
Given that T is a scalar type, return the IR type that should be used for load and store operations.
const CGRecordLayout & getCGRecordLayout(const RecordDecl *)
getCGRecordLayout - Return record layout info for the given record decl.
unsigned getTargetAddressSpace(QualType T) const
llvm::StructType * ConvertRecordDeclType(const RecordDecl *TD)
ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
void RefreshTypeCacheForClass(const CXXRecordDecl *RD)
Remove stale types from the type cache when an inheritance model gets assigned to a class.
bool isRecordLayoutComplete(const Type *Ty) const
isRecordLayoutComplete - Return true if the specified type is already completely laid out.
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
void UpdateCompletedType(const TagDecl *TD)
UpdateCompletedType - When we find the full definition for a TagDecl, replace the 'opaque' type we pr...
llvm::LLVMContext & getLLVMContext()
Definition: CodeGenTypes.h:112
bool typeRequiresSplitIntoByteArray(QualType ASTTy, llvm::Type *LLVMTy=nullptr)
Check whether the given type needs to be laid out in memory using an opaque byte-array type because i...
const llvm::DataLayout & getDataLayout() const
Definition: CodeGenTypes.h:104
CGCXXABI & getCXXABI() const
Definition: CodeGenTypes.h:111
bool isFuncParamTypeConvertible(QualType Ty)
isFuncParamTypeConvertible - Return true if the specified type in a function parameter or result posi...
bool isZeroInitializable(QualType T)
IsZeroInitializable - Return whether a type can be zero-initialized (in the C++ sense) with an LLVM z...
void addRecordTypeName(const RecordDecl *RD, llvm::StructType *Ty, StringRef suffix)
addRecordTypeName - Compute a name from the given record decl with an optional suffix and name the gi...
virtual llvm::Type * getCUDADeviceBuiltinSurfaceDeviceType() const
Return the device-side type for the CUDA device builtin surface type.
Definition: TargetInfo.h:381
virtual llvm::Type * getCUDADeviceBuiltinTextureDeviceType() const
Return the device-side type for the CUDA device builtin texture type.
Definition: TargetInfo.h:386
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:3578
uint64_t getZExtSize() const
Return the size zero-extended as a uint64_t.
Definition: Type.h:3654
Represents a concrete matrix type with constant number of rows and columns.
Definition: Type.h:4189
unsigned getNumColumns() const
Returns the number of columns in the matrix.
Definition: Type.h:4210
unsigned getNumRows() const
Returns the number of rows in the matrix.
Definition: Type.h:4207
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:523
DeclContext * getDeclContext()
Definition: DeclBase.h:454
Represents an enum.
Definition: Decl.h:3840
bool isFixed() const
Returns true if this is an Objective-C, C++11, or Microsoft-style enumeration with a fixed underlying...
Definition: Decl.h:4054
QualType getIntegerType() const
Return the integer type this enum decl corresponds to.
Definition: Decl.h:4000
Represents a K&R-style 'int foo()' function, which has no information available about its arguments.
Definition: Type.h:4638
Represents a prototype with parameter type info, e.g.
Definition: Type.h:4973
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:4278
QualType getReturnType() const
Definition: Type.h:4600
Represents a C array with an unspecified size.
Definition: Type.h:3725
QualType getElementType() const
Returns type of the elements being stored in the matrix.
Definition: Type.h:4167
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:3482
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:270
void printQualifiedName(raw_ostream &OS) const
Returns a human-readable qualified name for this declaration, like A::B::i, for i being member of nam...
Definition: Decl.cpp:1675
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:3161
QualType getPointeeType() const
Definition: Type.h:3171
A (possibly-)qualified type.
Definition: Type.h:941
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:7743
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:7869
bool isCanonical() const
Definition: Type.h:7800
Represents a struct/union/class.
Definition: Decl.h:4141
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:4332
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:5936
RecordDecl * getDecl() const
Definition: Type.h:5946
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:3402
QualType getPointeeType() const
Definition: Type.h:3420
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3557
StringRef getKindName() const
Definition: Decl.h:3748
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3660
TypedefNameDecl * getTypedefNameForAnonDecl() const
Definition: Decl.h:3785
void printName(raw_ostream &OS, const PrintingPolicy &Policy) const override
Pretty-print the unqualified name of this declaration.
Definition: Decl.cpp:4791
bool isDependentType() const
Whether this declaration declares a type that is dependent, i.e., a type that somehow depends on temp...
Definition: Decl.h:3711
virtual bool useFP16ConversionIntrinsics() const
Check whether llvm intrinsics such as llvm.convert.to.fp16 should be used to convert to and from __fp...
Definition: TargetInfo.h:992
The base class of the type hierarchy.
Definition: Type.h:1829
bool isBlockPointerType() const
Definition: Type.h:8006
bool isConstantMatrixType() const
Definition: Type.h:8126
bool isCUDADeviceBuiltinSurfaceType() const
Check if the type is the CUDA device builtin surface type.
Definition: Type.cpp:4985
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:705
bool isExtVectorBoolType() const
Definition: Type.h:8112
bool isBitIntType() const
Definition: Type.h:8230
bool isCUDADeviceBuiltinTextureType() const
Check if the type is the CUDA device builtin texture type.
Definition: Type.cpp:4992
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types,...
Definition: Type.cpp:2362
bool isFunctionType() const
Definition: Type.h:7992
bool isAnyPointerType() const
Definition: Type.h:8000
TypeClass getTypeClass() const
Definition: Type.h:2316
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:8516
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:3405
Represents a C array with a specified size that is not an integer-constant-expression.
Definition: Type.h:3769
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
The JSON file list parser is used to communicate input to InstallAPI.
const FunctionProtoType * T
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Describes how types, statements, expressions, and declarations should be printed.
Definition: PrettyPrinter.h:57
unsigned SuppressInlineNamespace
Suppress printing parts of scope specifiers that correspond to inline namespaces, where the name is u...