1 //===- DeclTemplate.cpp - Template Declaration AST Node Implementation ----===//
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 implements the C++ related Decl classes for templates.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/AST/DeclTemplate.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTMutationListener.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclarationName.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/AST/ExternalASTSource.h"
20 #include "clang/AST/TemplateBase.h"
21 #include "clang/AST/TemplateName.h"
22 #include "clang/AST/Type.h"
23 #include "clang/AST/TypeLoc.h"
24 #include "clang/Basic/Builtins.h"
25 #include "clang/Basic/LLVM.h"
26 #include "clang/Basic/SourceLocation.h"
27 #include "llvm/ADT/ArrayRef.h"
28 #include "llvm/ADT/FoldingSet.h"
29 #include "llvm/ADT/None.h"
30 #include "llvm/ADT/PointerUnion.h"
31 #include "llvm/ADT/SmallVector.h"
32 #include "llvm/Support/Casting.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include <algorithm>
35 #include <cassert>
36 #include <cstdint>
37 #include <memory>
38 #include <utility>
39
40 using namespace clang;
41
42 //===----------------------------------------------------------------------===//
43 // TemplateParameterList Implementation
44 //===----------------------------------------------------------------------===//
45
46
TemplateParameterList(const ASTContext & C,SourceLocation TemplateLoc,SourceLocation LAngleLoc,ArrayRef<NamedDecl * > Params,SourceLocation RAngleLoc,Expr * RequiresClause)47 TemplateParameterList::TemplateParameterList(const ASTContext& C,
48 SourceLocation TemplateLoc,
49 SourceLocation LAngleLoc,
50 ArrayRef<NamedDecl *> Params,
51 SourceLocation RAngleLoc,
52 Expr *RequiresClause)
53 : TemplateLoc(TemplateLoc), LAngleLoc(LAngleLoc), RAngleLoc(RAngleLoc),
54 NumParams(Params.size()), ContainsUnexpandedParameterPack(false),
55 HasRequiresClause(RequiresClause != nullptr),
56 HasConstrainedParameters(false) {
57 for (unsigned Idx = 0; Idx < NumParams; ++Idx) {
58 NamedDecl *P = Params[Idx];
59 begin()[Idx] = P;
60
61 bool IsPack = P->isTemplateParameterPack();
62 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
63 if (!IsPack && NTTP->getType()->containsUnexpandedParameterPack())
64 ContainsUnexpandedParameterPack = true;
65 if (NTTP->hasPlaceholderTypeConstraint())
66 HasConstrainedParameters = true;
67 } else if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(P)) {
68 if (!IsPack &&
69 TTP->getTemplateParameters()->containsUnexpandedParameterPack())
70 ContainsUnexpandedParameterPack = true;
71 } else if (const TypeConstraint *TC =
72 cast<TemplateTypeParmDecl>(P)->getTypeConstraint()) {
73 if (TC->getImmediatelyDeclaredConstraint()
74 ->containsUnexpandedParameterPack())
75 ContainsUnexpandedParameterPack = true;
76 HasConstrainedParameters = true;
77 }
78 // FIXME: If a default argument contains an unexpanded parameter pack, the
79 // template parameter list does too.
80 }
81
82 if (HasRequiresClause) {
83 if (RequiresClause->containsUnexpandedParameterPack())
84 ContainsUnexpandedParameterPack = true;
85 *getTrailingObjects<Expr *>() = RequiresClause;
86 }
87 }
88
89 TemplateParameterList *
Create(const ASTContext & C,SourceLocation TemplateLoc,SourceLocation LAngleLoc,ArrayRef<NamedDecl * > Params,SourceLocation RAngleLoc,Expr * RequiresClause)90 TemplateParameterList::Create(const ASTContext &C, SourceLocation TemplateLoc,
91 SourceLocation LAngleLoc,
92 ArrayRef<NamedDecl *> Params,
93 SourceLocation RAngleLoc, Expr *RequiresClause) {
94 void *Mem = C.Allocate(totalSizeToAlloc<NamedDecl *, Expr *>(
95 Params.size(), RequiresClause ? 1u : 0u),
96 alignof(TemplateParameterList));
97 return new (Mem) TemplateParameterList(C, TemplateLoc, LAngleLoc, Params,
98 RAngleLoc, RequiresClause);
99 }
100
getMinRequiredArguments() const101 unsigned TemplateParameterList::getMinRequiredArguments() const {
102 unsigned NumRequiredArgs = 0;
103 for (const NamedDecl *P : asArray()) {
104 if (P->isTemplateParameterPack()) {
105 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
106 if (NTTP->isExpandedParameterPack()) {
107 NumRequiredArgs += NTTP->getNumExpansionTypes();
108 continue;
109 }
110 } else if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(P)) {
111 if (TTP->isExpandedParameterPack()) {
112 NumRequiredArgs += TTP->getNumExpansionParameters();
113 continue;
114 }
115 } else {
116 const auto *TP = cast<TemplateTemplateParmDecl>(P);
117 if (TP->isExpandedParameterPack()) {
118 NumRequiredArgs += TP->getNumExpansionTemplateParameters();
119 continue;
120 }
121 }
122
123 break;
124 }
125
126 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(P)) {
127 if (TTP->hasDefaultArgument())
128 break;
129 } else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
130 if (NTTP->hasDefaultArgument())
131 break;
132 } else if (cast<TemplateTemplateParmDecl>(P)->hasDefaultArgument())
133 break;
134
135 ++NumRequiredArgs;
136 }
137
138 return NumRequiredArgs;
139 }
140
getDepth() const141 unsigned TemplateParameterList::getDepth() const {
142 if (size() == 0)
143 return 0;
144
145 const NamedDecl *FirstParm = getParam(0);
146 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(FirstParm))
147 return TTP->getDepth();
148 else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(FirstParm))
149 return NTTP->getDepth();
150 else
151 return cast<TemplateTemplateParmDecl>(FirstParm)->getDepth();
152 }
153
AdoptTemplateParameterList(TemplateParameterList * Params,DeclContext * Owner)154 static void AdoptTemplateParameterList(TemplateParameterList *Params,
155 DeclContext *Owner) {
156 for (NamedDecl *P : *Params) {
157 P->setDeclContext(Owner);
158
159 if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(P))
160 AdoptTemplateParameterList(TTP->getTemplateParameters(), Owner);
161 }
162 }
163
164 void TemplateParameterList::
getAssociatedConstraints(llvm::SmallVectorImpl<const Expr * > & AC) const165 getAssociatedConstraints(llvm::SmallVectorImpl<const Expr *> &AC) const {
166 if (HasConstrainedParameters)
167 for (const NamedDecl *Param : *this) {
168 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
169 if (const auto *TC = TTP->getTypeConstraint())
170 AC.push_back(TC->getImmediatelyDeclaredConstraint());
171 } else if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
172 if (const Expr *E = NTTP->getPlaceholderTypeConstraint())
173 AC.push_back(E);
174 }
175 }
176 if (HasRequiresClause)
177 AC.push_back(getRequiresClause());
178 }
179
hasAssociatedConstraints() const180 bool TemplateParameterList::hasAssociatedConstraints() const {
181 return HasRequiresClause || HasConstrainedParameters;
182 }
183
184 namespace clang {
185
allocateDefaultArgStorageChain(const ASTContext & C)186 void *allocateDefaultArgStorageChain(const ASTContext &C) {
187 return new (C) char[sizeof(void*) * 2];
188 }
189
190 } // namespace clang
191
192 //===----------------------------------------------------------------------===//
193 // TemplateDecl Implementation
194 //===----------------------------------------------------------------------===//
195
TemplateDecl(Kind DK,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,NamedDecl * Decl)196 TemplateDecl::TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L,
197 DeclarationName Name, TemplateParameterList *Params,
198 NamedDecl *Decl)
199 : NamedDecl(DK, DC, L, Name), TemplatedDecl(Decl), TemplateParams(Params) {}
200
anchor()201 void TemplateDecl::anchor() {}
202
203 void TemplateDecl::
getAssociatedConstraints(llvm::SmallVectorImpl<const Expr * > & AC) const204 getAssociatedConstraints(llvm::SmallVectorImpl<const Expr *> &AC) const {
205 TemplateParams->getAssociatedConstraints(AC);
206 if (auto *FD = dyn_cast_or_null<FunctionDecl>(getTemplatedDecl()))
207 if (const Expr *TRC = FD->getTrailingRequiresClause())
208 AC.push_back(TRC);
209 }
210
hasAssociatedConstraints() const211 bool TemplateDecl::hasAssociatedConstraints() const {
212 if (TemplateParams->hasAssociatedConstraints())
213 return true;
214 if (auto *FD = dyn_cast_or_null<FunctionDecl>(getTemplatedDecl()))
215 return FD->getTrailingRequiresClause();
216 return false;
217 }
218
219 //===----------------------------------------------------------------------===//
220 // RedeclarableTemplateDecl Implementation
221 //===----------------------------------------------------------------------===//
222
anchor()223 void RedeclarableTemplateDecl::anchor() {}
224
getCommonPtr() const225 RedeclarableTemplateDecl::CommonBase *RedeclarableTemplateDecl::getCommonPtr() const {
226 if (Common)
227 return Common;
228
229 // Walk the previous-declaration chain until we either find a declaration
230 // with a common pointer or we run out of previous declarations.
231 SmallVector<const RedeclarableTemplateDecl *, 2> PrevDecls;
232 for (const RedeclarableTemplateDecl *Prev = getPreviousDecl(); Prev;
233 Prev = Prev->getPreviousDecl()) {
234 if (Prev->Common) {
235 Common = Prev->Common;
236 break;
237 }
238
239 PrevDecls.push_back(Prev);
240 }
241
242 // If we never found a common pointer, allocate one now.
243 if (!Common) {
244 // FIXME: If any of the declarations is from an AST file, we probably
245 // need an update record to add the common data.
246
247 Common = newCommon(getASTContext());
248 }
249
250 // Update any previous declarations we saw with the common pointer.
251 for (const RedeclarableTemplateDecl *Prev : PrevDecls)
252 Prev->Common = Common;
253
254 return Common;
255 }
256
loadLazySpecializationsImpl() const257 void RedeclarableTemplateDecl::loadLazySpecializationsImpl() const {
258 // Grab the most recent declaration to ensure we've loaded any lazy
259 // redeclarations of this template.
260 CommonBase *CommonBasePtr = getMostRecentDecl()->getCommonPtr();
261 if (CommonBasePtr->LazySpecializations) {
262 ASTContext &Context = getASTContext();
263 uint32_t *Specs = CommonBasePtr->LazySpecializations;
264 CommonBasePtr->LazySpecializations = nullptr;
265 for (uint32_t I = 0, N = *Specs++; I != N; ++I)
266 (void)Context.getExternalSource()->GetExternalDecl(Specs[I]);
267 }
268 }
269
270 template<class EntryType, typename... ProfileArguments>
271 typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
findSpecializationImpl(llvm::FoldingSetVector<EntryType> & Specs,void * & InsertPos,ProfileArguments &&...ProfileArgs)272 RedeclarableTemplateDecl::findSpecializationImpl(
273 llvm::FoldingSetVector<EntryType> &Specs, void *&InsertPos,
274 ProfileArguments&&... ProfileArgs) {
275 using SETraits = SpecEntryTraits<EntryType>;
276
277 llvm::FoldingSetNodeID ID;
278 EntryType::Profile(ID, std::forward<ProfileArguments>(ProfileArgs)...,
279 getASTContext());
280 EntryType *Entry = Specs.FindNodeOrInsertPos(ID, InsertPos);
281 return Entry ? SETraits::getDecl(Entry)->getMostRecentDecl() : nullptr;
282 }
283
284 template<class Derived, class EntryType>
addSpecializationImpl(llvm::FoldingSetVector<EntryType> & Specializations,EntryType * Entry,void * InsertPos)285 void RedeclarableTemplateDecl::addSpecializationImpl(
286 llvm::FoldingSetVector<EntryType> &Specializations, EntryType *Entry,
287 void *InsertPos) {
288 using SETraits = SpecEntryTraits<EntryType>;
289
290 if (InsertPos) {
291 #ifndef NDEBUG
292 void *CorrectInsertPos;
293 assert(!findSpecializationImpl(Specializations,
294 CorrectInsertPos,
295 SETraits::getTemplateArgs(Entry)) &&
296 InsertPos == CorrectInsertPos &&
297 "given incorrect InsertPos for specialization");
298 #endif
299 Specializations.InsertNode(Entry, InsertPos);
300 } else {
301 EntryType *Existing = Specializations.GetOrInsertNode(Entry);
302 (void)Existing;
303 assert(SETraits::getDecl(Existing)->isCanonicalDecl() &&
304 "non-canonical specialization?");
305 }
306
307 if (ASTMutationListener *L = getASTMutationListener())
308 L->AddedCXXTemplateSpecialization(cast<Derived>(this),
309 SETraits::getDecl(Entry));
310 }
311
312 //===----------------------------------------------------------------------===//
313 // FunctionTemplateDecl Implementation
314 //===----------------------------------------------------------------------===//
315
Create(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,NamedDecl * Decl)316 FunctionTemplateDecl *FunctionTemplateDecl::Create(ASTContext &C,
317 DeclContext *DC,
318 SourceLocation L,
319 DeclarationName Name,
320 TemplateParameterList *Params,
321 NamedDecl *Decl) {
322 AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
323 return new (C, DC) FunctionTemplateDecl(C, DC, L, Name, Params, Decl);
324 }
325
CreateDeserialized(ASTContext & C,unsigned ID)326 FunctionTemplateDecl *FunctionTemplateDecl::CreateDeserialized(ASTContext &C,
327 unsigned ID) {
328 return new (C, ID) FunctionTemplateDecl(C, nullptr, SourceLocation(),
329 DeclarationName(), nullptr, nullptr);
330 }
331
332 RedeclarableTemplateDecl::CommonBase *
newCommon(ASTContext & C) const333 FunctionTemplateDecl::newCommon(ASTContext &C) const {
334 auto *CommonPtr = new (C) Common;
335 C.addDestruction(CommonPtr);
336 return CommonPtr;
337 }
338
LoadLazySpecializations() const339 void FunctionTemplateDecl::LoadLazySpecializations() const {
340 loadLazySpecializationsImpl();
341 }
342
343 llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> &
getSpecializations() const344 FunctionTemplateDecl::getSpecializations() const {
345 LoadLazySpecializations();
346 return getCommonPtr()->Specializations;
347 }
348
349 FunctionDecl *
findSpecialization(ArrayRef<TemplateArgument> Args,void * & InsertPos)350 FunctionTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
351 void *&InsertPos) {
352 return findSpecializationImpl(getSpecializations(), InsertPos, Args);
353 }
354
addSpecialization(FunctionTemplateSpecializationInfo * Info,void * InsertPos)355 void FunctionTemplateDecl::addSpecialization(
356 FunctionTemplateSpecializationInfo *Info, void *InsertPos) {
357 addSpecializationImpl<FunctionTemplateDecl>(getSpecializations(), Info,
358 InsertPos);
359 }
360
getInjectedTemplateArgs()361 ArrayRef<TemplateArgument> FunctionTemplateDecl::getInjectedTemplateArgs() {
362 TemplateParameterList *Params = getTemplateParameters();
363 Common *CommonPtr = getCommonPtr();
364 if (!CommonPtr->InjectedArgs) {
365 auto &Context = getASTContext();
366 SmallVector<TemplateArgument, 16> TemplateArgs;
367 Context.getInjectedTemplateArgs(Params, TemplateArgs);
368 CommonPtr->InjectedArgs =
369 new (Context) TemplateArgument[TemplateArgs.size()];
370 std::copy(TemplateArgs.begin(), TemplateArgs.end(),
371 CommonPtr->InjectedArgs);
372 }
373
374 return llvm::makeArrayRef(CommonPtr->InjectedArgs, Params->size());
375 }
376
mergePrevDecl(FunctionTemplateDecl * Prev)377 void FunctionTemplateDecl::mergePrevDecl(FunctionTemplateDecl *Prev) {
378 using Base = RedeclarableTemplateDecl;
379
380 // If we haven't created a common pointer yet, then it can just be created
381 // with the usual method.
382 if (!Base::Common)
383 return;
384
385 Common *ThisCommon = static_cast<Common *>(Base::Common);
386 Common *PrevCommon = nullptr;
387 SmallVector<FunctionTemplateDecl *, 8> PreviousDecls;
388 for (; Prev; Prev = Prev->getPreviousDecl()) {
389 if (Prev->Base::Common) {
390 PrevCommon = static_cast<Common *>(Prev->Base::Common);
391 break;
392 }
393 PreviousDecls.push_back(Prev);
394 }
395
396 // If the previous redecl chain hasn't created a common pointer yet, then just
397 // use this common pointer.
398 if (!PrevCommon) {
399 for (auto *D : PreviousDecls)
400 D->Base::Common = ThisCommon;
401 return;
402 }
403
404 // Ensure we don't leak any important state.
405 assert(ThisCommon->Specializations.size() == 0 &&
406 "Can't merge incompatible declarations!");
407
408 Base::Common = PrevCommon;
409 }
410
411 //===----------------------------------------------------------------------===//
412 // ClassTemplateDecl Implementation
413 //===----------------------------------------------------------------------===//
414
Create(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,NamedDecl * Decl)415 ClassTemplateDecl *ClassTemplateDecl::Create(ASTContext &C,
416 DeclContext *DC,
417 SourceLocation L,
418 DeclarationName Name,
419 TemplateParameterList *Params,
420 NamedDecl *Decl) {
421 AdoptTemplateParameterList(Params, cast<DeclContext>(Decl));
422
423 return new (C, DC) ClassTemplateDecl(C, DC, L, Name, Params, Decl);
424 }
425
CreateDeserialized(ASTContext & C,unsigned ID)426 ClassTemplateDecl *ClassTemplateDecl::CreateDeserialized(ASTContext &C,
427 unsigned ID) {
428 return new (C, ID) ClassTemplateDecl(C, nullptr, SourceLocation(),
429 DeclarationName(), nullptr, nullptr);
430 }
431
LoadLazySpecializations() const432 void ClassTemplateDecl::LoadLazySpecializations() const {
433 loadLazySpecializationsImpl();
434 }
435
436 llvm::FoldingSetVector<ClassTemplateSpecializationDecl> &
getSpecializations() const437 ClassTemplateDecl::getSpecializations() const {
438 LoadLazySpecializations();
439 return getCommonPtr()->Specializations;
440 }
441
442 llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &
getPartialSpecializations()443 ClassTemplateDecl::getPartialSpecializations() {
444 LoadLazySpecializations();
445 return getCommonPtr()->PartialSpecializations;
446 }
447
448 RedeclarableTemplateDecl::CommonBase *
newCommon(ASTContext & C) const449 ClassTemplateDecl::newCommon(ASTContext &C) const {
450 auto *CommonPtr = new (C) Common;
451 C.addDestruction(CommonPtr);
452 return CommonPtr;
453 }
454
455 ClassTemplateSpecializationDecl *
findSpecialization(ArrayRef<TemplateArgument> Args,void * & InsertPos)456 ClassTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
457 void *&InsertPos) {
458 return findSpecializationImpl(getSpecializations(), InsertPos, Args);
459 }
460
AddSpecialization(ClassTemplateSpecializationDecl * D,void * InsertPos)461 void ClassTemplateDecl::AddSpecialization(ClassTemplateSpecializationDecl *D,
462 void *InsertPos) {
463 addSpecializationImpl<ClassTemplateDecl>(getSpecializations(), D, InsertPos);
464 }
465
466 ClassTemplatePartialSpecializationDecl *
findPartialSpecialization(ArrayRef<TemplateArgument> Args,TemplateParameterList * TPL,void * & InsertPos)467 ClassTemplateDecl::findPartialSpecialization(
468 ArrayRef<TemplateArgument> Args,
469 TemplateParameterList *TPL, void *&InsertPos) {
470 return findSpecializationImpl(getPartialSpecializations(), InsertPos, Args,
471 TPL);
472 }
473
ProfileTemplateParameterList(ASTContext & C,llvm::FoldingSetNodeID & ID,const TemplateParameterList * TPL)474 static void ProfileTemplateParameterList(ASTContext &C,
475 llvm::FoldingSetNodeID &ID, const TemplateParameterList *TPL) {
476 const Expr *RC = TPL->getRequiresClause();
477 ID.AddBoolean(RC != nullptr);
478 if (RC)
479 RC->Profile(ID, C, /*Canonical=*/true);
480 ID.AddInteger(TPL->size());
481 for (NamedDecl *D : *TPL) {
482 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
483 ID.AddInteger(0);
484 ID.AddBoolean(NTTP->isParameterPack());
485 NTTP->getType().getCanonicalType().Profile(ID);
486 continue;
487 }
488 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(D)) {
489 ID.AddInteger(1);
490 ID.AddBoolean(TTP->isParameterPack());
491 ID.AddBoolean(TTP->hasTypeConstraint());
492 if (const TypeConstraint *TC = TTP->getTypeConstraint())
493 TC->getImmediatelyDeclaredConstraint()->Profile(ID, C,
494 /*Canonical=*/true);
495 continue;
496 }
497 const auto *TTP = cast<TemplateTemplateParmDecl>(D);
498 ID.AddInteger(2);
499 ID.AddBoolean(TTP->isParameterPack());
500 ProfileTemplateParameterList(C, ID, TTP->getTemplateParameters());
501 }
502 }
503
504 void
Profile(llvm::FoldingSetNodeID & ID,ArrayRef<TemplateArgument> TemplateArgs,TemplateParameterList * TPL,ASTContext & Context)505 ClassTemplatePartialSpecializationDecl::Profile(llvm::FoldingSetNodeID &ID,
506 ArrayRef<TemplateArgument> TemplateArgs, TemplateParameterList *TPL,
507 ASTContext &Context) {
508 ID.AddInteger(TemplateArgs.size());
509 for (const TemplateArgument &TemplateArg : TemplateArgs)
510 TemplateArg.Profile(ID, Context);
511 ProfileTemplateParameterList(Context, ID, TPL);
512 }
513
AddPartialSpecialization(ClassTemplatePartialSpecializationDecl * D,void * InsertPos)514 void ClassTemplateDecl::AddPartialSpecialization(
515 ClassTemplatePartialSpecializationDecl *D,
516 void *InsertPos) {
517 if (InsertPos)
518 getPartialSpecializations().InsertNode(D, InsertPos);
519 else {
520 ClassTemplatePartialSpecializationDecl *Existing
521 = getPartialSpecializations().GetOrInsertNode(D);
522 (void)Existing;
523 assert(Existing->isCanonicalDecl() && "Non-canonical specialization?");
524 }
525
526 if (ASTMutationListener *L = getASTMutationListener())
527 L->AddedCXXTemplateSpecialization(this, D);
528 }
529
getPartialSpecializations(SmallVectorImpl<ClassTemplatePartialSpecializationDecl * > & PS)530 void ClassTemplateDecl::getPartialSpecializations(
531 SmallVectorImpl<ClassTemplatePartialSpecializationDecl *> &PS) {
532 llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &PartialSpecs
533 = getPartialSpecializations();
534 PS.clear();
535 PS.reserve(PartialSpecs.size());
536 for (ClassTemplatePartialSpecializationDecl &P : PartialSpecs)
537 PS.push_back(P.getMostRecentDecl());
538 }
539
540 ClassTemplatePartialSpecializationDecl *
findPartialSpecialization(QualType T)541 ClassTemplateDecl::findPartialSpecialization(QualType T) {
542 ASTContext &Context = getASTContext();
543 for (ClassTemplatePartialSpecializationDecl &P :
544 getPartialSpecializations()) {
545 if (Context.hasSameType(P.getInjectedSpecializationType(), T))
546 return P.getMostRecentDecl();
547 }
548
549 return nullptr;
550 }
551
552 ClassTemplatePartialSpecializationDecl *
findPartialSpecInstantiatedFromMember(ClassTemplatePartialSpecializationDecl * D)553 ClassTemplateDecl::findPartialSpecInstantiatedFromMember(
554 ClassTemplatePartialSpecializationDecl *D) {
555 Decl *DCanon = D->getCanonicalDecl();
556 for (ClassTemplatePartialSpecializationDecl &P : getPartialSpecializations()) {
557 if (P.getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
558 return P.getMostRecentDecl();
559 }
560
561 return nullptr;
562 }
563
564 QualType
getInjectedClassNameSpecialization()565 ClassTemplateDecl::getInjectedClassNameSpecialization() {
566 Common *CommonPtr = getCommonPtr();
567 if (!CommonPtr->InjectedClassNameType.isNull())
568 return CommonPtr->InjectedClassNameType;
569
570 // C++0x [temp.dep.type]p2:
571 // The template argument list of a primary template is a template argument
572 // list in which the nth template argument has the value of the nth template
573 // parameter of the class template. If the nth template parameter is a
574 // template parameter pack (14.5.3), the nth template argument is a pack
575 // expansion (14.5.3) whose pattern is the name of the template parameter
576 // pack.
577 ASTContext &Context = getASTContext();
578 TemplateParameterList *Params = getTemplateParameters();
579 SmallVector<TemplateArgument, 16> TemplateArgs;
580 Context.getInjectedTemplateArgs(Params, TemplateArgs);
581 CommonPtr->InjectedClassNameType
582 = Context.getTemplateSpecializationType(TemplateName(this),
583 TemplateArgs);
584 return CommonPtr->InjectedClassNameType;
585 }
586
587 //===----------------------------------------------------------------------===//
588 // TemplateTypeParm Allocation/Deallocation Method Implementations
589 //===----------------------------------------------------------------------===//
590
591 TemplateTypeParmDecl *
Create(const ASTContext & C,DeclContext * DC,SourceLocation KeyLoc,SourceLocation NameLoc,unsigned D,unsigned P,IdentifierInfo * Id,bool Typename,bool ParameterPack,bool HasTypeConstraint,Optional<unsigned> NumExpanded)592 TemplateTypeParmDecl::Create(const ASTContext &C, DeclContext *DC,
593 SourceLocation KeyLoc, SourceLocation NameLoc,
594 unsigned D, unsigned P, IdentifierInfo *Id,
595 bool Typename, bool ParameterPack,
596 bool HasTypeConstraint,
597 Optional<unsigned> NumExpanded) {
598 auto *TTPDecl =
599 new (C, DC,
600 additionalSizeToAlloc<TypeConstraint>(HasTypeConstraint ? 1 : 0))
601 TemplateTypeParmDecl(DC, KeyLoc, NameLoc, Id, Typename,
602 HasTypeConstraint, NumExpanded);
603 QualType TTPType = C.getTemplateTypeParmType(D, P, ParameterPack, TTPDecl);
604 TTPDecl->setTypeForDecl(TTPType.getTypePtr());
605 return TTPDecl;
606 }
607
608 TemplateTypeParmDecl *
CreateDeserialized(const ASTContext & C,unsigned ID)609 TemplateTypeParmDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
610 return new (C, ID) TemplateTypeParmDecl(nullptr, SourceLocation(),
611 SourceLocation(), nullptr, false,
612 false, None);
613 }
614
615 TemplateTypeParmDecl *
CreateDeserialized(const ASTContext & C,unsigned ID,bool HasTypeConstraint)616 TemplateTypeParmDecl::CreateDeserialized(const ASTContext &C, unsigned ID,
617 bool HasTypeConstraint) {
618 return new (C, ID,
619 additionalSizeToAlloc<TypeConstraint>(HasTypeConstraint ? 1 : 0))
620 TemplateTypeParmDecl(nullptr, SourceLocation(), SourceLocation(),
621 nullptr, false, HasTypeConstraint, None);
622 }
623
getDefaultArgumentLoc() const624 SourceLocation TemplateTypeParmDecl::getDefaultArgumentLoc() const {
625 return hasDefaultArgument()
626 ? getDefaultArgumentInfo()->getTypeLoc().getBeginLoc()
627 : SourceLocation();
628 }
629
getSourceRange() const630 SourceRange TemplateTypeParmDecl::getSourceRange() const {
631 if (hasDefaultArgument() && !defaultArgumentWasInherited())
632 return SourceRange(getBeginLoc(),
633 getDefaultArgumentInfo()->getTypeLoc().getEndLoc());
634 // TypeDecl::getSourceRange returns a range containing name location, which is
635 // wrong for unnamed template parameters. e.g:
636 // it will return <[[typename>]] instead of <[[typename]]>
637 else if (getDeclName().isEmpty())
638 return SourceRange(getBeginLoc());
639 return TypeDecl::getSourceRange();
640 }
641
getDepth() const642 unsigned TemplateTypeParmDecl::getDepth() const {
643 return getTypeForDecl()->castAs<TemplateTypeParmType>()->getDepth();
644 }
645
getIndex() const646 unsigned TemplateTypeParmDecl::getIndex() const {
647 return getTypeForDecl()->castAs<TemplateTypeParmType>()->getIndex();
648 }
649
isParameterPack() const650 bool TemplateTypeParmDecl::isParameterPack() const {
651 return getTypeForDecl()->castAs<TemplateTypeParmType>()->isParameterPack();
652 }
653
setTypeConstraint(NestedNameSpecifierLoc NNS,DeclarationNameInfo NameInfo,NamedDecl * FoundDecl,ConceptDecl * CD,const ASTTemplateArgumentListInfo * ArgsAsWritten,Expr * ImmediatelyDeclaredConstraint)654 void TemplateTypeParmDecl::setTypeConstraint(NestedNameSpecifierLoc NNS,
655 DeclarationNameInfo NameInfo, NamedDecl *FoundDecl, ConceptDecl *CD,
656 const ASTTemplateArgumentListInfo *ArgsAsWritten,
657 Expr *ImmediatelyDeclaredConstraint) {
658 assert(HasTypeConstraint &&
659 "HasTypeConstraint=true must be passed at construction in order to "
660 "call setTypeConstraint");
661 assert(!TypeConstraintInitialized &&
662 "TypeConstraint was already initialized!");
663 new (getTrailingObjects<TypeConstraint>()) TypeConstraint(NNS, NameInfo,
664 FoundDecl, CD, ArgsAsWritten, ImmediatelyDeclaredConstraint);
665 TypeConstraintInitialized = true;
666 }
667
668 //===----------------------------------------------------------------------===//
669 // NonTypeTemplateParmDecl Method Implementations
670 //===----------------------------------------------------------------------===//
671
NonTypeTemplateParmDecl(DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,unsigned D,unsigned P,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,ArrayRef<QualType> ExpandedTypes,ArrayRef<TypeSourceInfo * > ExpandedTInfos)672 NonTypeTemplateParmDecl::NonTypeTemplateParmDecl(
673 DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, unsigned D,
674 unsigned P, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
675 ArrayRef<QualType> ExpandedTypes, ArrayRef<TypeSourceInfo *> ExpandedTInfos)
676 : DeclaratorDecl(NonTypeTemplateParm, DC, IdLoc, Id, T, TInfo, StartLoc),
677 TemplateParmPosition(D, P), ParameterPack(true),
678 ExpandedParameterPack(true), NumExpandedTypes(ExpandedTypes.size()) {
679 if (!ExpandedTypes.empty() && !ExpandedTInfos.empty()) {
680 auto TypesAndInfos =
681 getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
682 for (unsigned I = 0; I != NumExpandedTypes; ++I) {
683 new (&TypesAndInfos[I].first) QualType(ExpandedTypes[I]);
684 TypesAndInfos[I].second = ExpandedTInfos[I];
685 }
686 }
687 }
688
689 NonTypeTemplateParmDecl *
Create(const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,unsigned D,unsigned P,IdentifierInfo * Id,QualType T,bool ParameterPack,TypeSourceInfo * TInfo)690 NonTypeTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
691 SourceLocation StartLoc, SourceLocation IdLoc,
692 unsigned D, unsigned P, IdentifierInfo *Id,
693 QualType T, bool ParameterPack,
694 TypeSourceInfo *TInfo) {
695 AutoType *AT =
696 C.getLangOpts().CPlusPlus20 ? T->getContainedAutoType() : nullptr;
697 return new (C, DC,
698 additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>,
699 Expr *>(0,
700 AT && AT->isConstrained() ? 1 : 0))
701 NonTypeTemplateParmDecl(DC, StartLoc, IdLoc, D, P, Id, T, ParameterPack,
702 TInfo);
703 }
704
Create(const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,unsigned D,unsigned P,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,ArrayRef<QualType> ExpandedTypes,ArrayRef<TypeSourceInfo * > ExpandedTInfos)705 NonTypeTemplateParmDecl *NonTypeTemplateParmDecl::Create(
706 const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
707 SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
708 QualType T, TypeSourceInfo *TInfo, ArrayRef<QualType> ExpandedTypes,
709 ArrayRef<TypeSourceInfo *> ExpandedTInfos) {
710 AutoType *AT = TInfo->getType()->getContainedAutoType();
711 return new (C, DC,
712 additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>,
713 Expr *>(
714 ExpandedTypes.size(), AT && AT->isConstrained() ? 1 : 0))
715 NonTypeTemplateParmDecl(DC, StartLoc, IdLoc, D, P, Id, T, TInfo,
716 ExpandedTypes, ExpandedTInfos);
717 }
718
719 NonTypeTemplateParmDecl *
CreateDeserialized(ASTContext & C,unsigned ID,bool HasTypeConstraint)720 NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
721 bool HasTypeConstraint) {
722 return new (C, ID, additionalSizeToAlloc<std::pair<QualType,
723 TypeSourceInfo *>,
724 Expr *>(0,
725 HasTypeConstraint ? 1 : 0))
726 NonTypeTemplateParmDecl(nullptr, SourceLocation(), SourceLocation(),
727 0, 0, nullptr, QualType(), false, nullptr);
728 }
729
730 NonTypeTemplateParmDecl *
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumExpandedTypes,bool HasTypeConstraint)731 NonTypeTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
732 unsigned NumExpandedTypes,
733 bool HasTypeConstraint) {
734 auto *NTTP =
735 new (C, ID, additionalSizeToAlloc<std::pair<QualType, TypeSourceInfo *>,
736 Expr *>(
737 NumExpandedTypes, HasTypeConstraint ? 1 : 0))
738 NonTypeTemplateParmDecl(nullptr, SourceLocation(), SourceLocation(),
739 0, 0, nullptr, QualType(), nullptr, None,
740 None);
741 NTTP->NumExpandedTypes = NumExpandedTypes;
742 return NTTP;
743 }
744
getSourceRange() const745 SourceRange NonTypeTemplateParmDecl::getSourceRange() const {
746 if (hasDefaultArgument() && !defaultArgumentWasInherited())
747 return SourceRange(getOuterLocStart(),
748 getDefaultArgument()->getSourceRange().getEnd());
749 return DeclaratorDecl::getSourceRange();
750 }
751
getDefaultArgumentLoc() const752 SourceLocation NonTypeTemplateParmDecl::getDefaultArgumentLoc() const {
753 return hasDefaultArgument()
754 ? getDefaultArgument()->getSourceRange().getBegin()
755 : SourceLocation();
756 }
757
758 //===----------------------------------------------------------------------===//
759 // TemplateTemplateParmDecl Method Implementations
760 //===----------------------------------------------------------------------===//
761
anchor()762 void TemplateTemplateParmDecl::anchor() {}
763
TemplateTemplateParmDecl(DeclContext * DC,SourceLocation L,unsigned D,unsigned P,IdentifierInfo * Id,TemplateParameterList * Params,ArrayRef<TemplateParameterList * > Expansions)764 TemplateTemplateParmDecl::TemplateTemplateParmDecl(
765 DeclContext *DC, SourceLocation L, unsigned D, unsigned P,
766 IdentifierInfo *Id, TemplateParameterList *Params,
767 ArrayRef<TemplateParameterList *> Expansions)
768 : TemplateDecl(TemplateTemplateParm, DC, L, Id, Params),
769 TemplateParmPosition(D, P), ParameterPack(true),
770 ExpandedParameterPack(true), NumExpandedParams(Expansions.size()) {
771 if (!Expansions.empty())
772 std::uninitialized_copy(Expansions.begin(), Expansions.end(),
773 getTrailingObjects<TemplateParameterList *>());
774 }
775
776 TemplateTemplateParmDecl *
Create(const ASTContext & C,DeclContext * DC,SourceLocation L,unsigned D,unsigned P,bool ParameterPack,IdentifierInfo * Id,TemplateParameterList * Params)777 TemplateTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
778 SourceLocation L, unsigned D, unsigned P,
779 bool ParameterPack, IdentifierInfo *Id,
780 TemplateParameterList *Params) {
781 return new (C, DC) TemplateTemplateParmDecl(DC, L, D, P, ParameterPack, Id,
782 Params);
783 }
784
785 TemplateTemplateParmDecl *
Create(const ASTContext & C,DeclContext * DC,SourceLocation L,unsigned D,unsigned P,IdentifierInfo * Id,TemplateParameterList * Params,ArrayRef<TemplateParameterList * > Expansions)786 TemplateTemplateParmDecl::Create(const ASTContext &C, DeclContext *DC,
787 SourceLocation L, unsigned D, unsigned P,
788 IdentifierInfo *Id,
789 TemplateParameterList *Params,
790 ArrayRef<TemplateParameterList *> Expansions) {
791 return new (C, DC,
792 additionalSizeToAlloc<TemplateParameterList *>(Expansions.size()))
793 TemplateTemplateParmDecl(DC, L, D, P, Id, Params, Expansions);
794 }
795
796 TemplateTemplateParmDecl *
CreateDeserialized(ASTContext & C,unsigned ID)797 TemplateTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
798 return new (C, ID) TemplateTemplateParmDecl(nullptr, SourceLocation(), 0, 0,
799 false, nullptr, nullptr);
800 }
801
802 TemplateTemplateParmDecl *
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumExpansions)803 TemplateTemplateParmDecl::CreateDeserialized(ASTContext &C, unsigned ID,
804 unsigned NumExpansions) {
805 auto *TTP =
806 new (C, ID, additionalSizeToAlloc<TemplateParameterList *>(NumExpansions))
807 TemplateTemplateParmDecl(nullptr, SourceLocation(), 0, 0, nullptr,
808 nullptr, None);
809 TTP->NumExpandedParams = NumExpansions;
810 return TTP;
811 }
812
getDefaultArgumentLoc() const813 SourceLocation TemplateTemplateParmDecl::getDefaultArgumentLoc() const {
814 return hasDefaultArgument() ? getDefaultArgument().getLocation()
815 : SourceLocation();
816 }
817
setDefaultArgument(const ASTContext & C,const TemplateArgumentLoc & DefArg)818 void TemplateTemplateParmDecl::setDefaultArgument(
819 const ASTContext &C, const TemplateArgumentLoc &DefArg) {
820 if (DefArg.getArgument().isNull())
821 DefaultArgument.set(nullptr);
822 else
823 DefaultArgument.set(new (C) TemplateArgumentLoc(DefArg));
824 }
825
826 //===----------------------------------------------------------------------===//
827 // TemplateArgumentList Implementation
828 //===----------------------------------------------------------------------===//
TemplateArgumentList(ArrayRef<TemplateArgument> Args)829 TemplateArgumentList::TemplateArgumentList(ArrayRef<TemplateArgument> Args)
830 : Arguments(getTrailingObjects<TemplateArgument>()),
831 NumArguments(Args.size()) {
832 std::uninitialized_copy(Args.begin(), Args.end(),
833 getTrailingObjects<TemplateArgument>());
834 }
835
836 TemplateArgumentList *
CreateCopy(ASTContext & Context,ArrayRef<TemplateArgument> Args)837 TemplateArgumentList::CreateCopy(ASTContext &Context,
838 ArrayRef<TemplateArgument> Args) {
839 void *Mem = Context.Allocate(totalSizeToAlloc<TemplateArgument>(Args.size()));
840 return new (Mem) TemplateArgumentList(Args);
841 }
842
Create(ASTContext & C,FunctionDecl * FD,FunctionTemplateDecl * Template,TemplateSpecializationKind TSK,const TemplateArgumentList * TemplateArgs,const TemplateArgumentListInfo * TemplateArgsAsWritten,SourceLocation POI,MemberSpecializationInfo * MSInfo)843 FunctionTemplateSpecializationInfo *FunctionTemplateSpecializationInfo::Create(
844 ASTContext &C, FunctionDecl *FD, FunctionTemplateDecl *Template,
845 TemplateSpecializationKind TSK, const TemplateArgumentList *TemplateArgs,
846 const TemplateArgumentListInfo *TemplateArgsAsWritten, SourceLocation POI,
847 MemberSpecializationInfo *MSInfo) {
848 const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;
849 if (TemplateArgsAsWritten)
850 ArgsAsWritten = ASTTemplateArgumentListInfo::Create(C,
851 *TemplateArgsAsWritten);
852
853 void *Mem =
854 C.Allocate(totalSizeToAlloc<MemberSpecializationInfo *>(MSInfo ? 1 : 0));
855 return new (Mem) FunctionTemplateSpecializationInfo(
856 FD, Template, TSK, TemplateArgs, ArgsAsWritten, POI, MSInfo);
857 }
858
859 //===----------------------------------------------------------------------===//
860 // ClassTemplateSpecializationDecl Implementation
861 //===----------------------------------------------------------------------===//
862
863 ClassTemplateSpecializationDecl::
ClassTemplateSpecializationDecl(ASTContext & Context,Kind DK,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,ClassTemplateDecl * SpecializedTemplate,ArrayRef<TemplateArgument> Args,ClassTemplateSpecializationDecl * PrevDecl)864 ClassTemplateSpecializationDecl(ASTContext &Context, Kind DK, TagKind TK,
865 DeclContext *DC, SourceLocation StartLoc,
866 SourceLocation IdLoc,
867 ClassTemplateDecl *SpecializedTemplate,
868 ArrayRef<TemplateArgument> Args,
869 ClassTemplateSpecializationDecl *PrevDecl)
870 : CXXRecordDecl(DK, TK, Context, DC, StartLoc, IdLoc,
871 SpecializedTemplate->getIdentifier(), PrevDecl),
872 SpecializedTemplate(SpecializedTemplate),
873 TemplateArgs(TemplateArgumentList::CreateCopy(Context, Args)),
874 SpecializationKind(TSK_Undeclared) {
875 }
876
ClassTemplateSpecializationDecl(ASTContext & C,Kind DK)877 ClassTemplateSpecializationDecl::ClassTemplateSpecializationDecl(ASTContext &C,
878 Kind DK)
879 : CXXRecordDecl(DK, TTK_Struct, C, nullptr, SourceLocation(),
880 SourceLocation(), nullptr, nullptr),
881 SpecializationKind(TSK_Undeclared) {}
882
883 ClassTemplateSpecializationDecl *
Create(ASTContext & Context,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,ClassTemplateDecl * SpecializedTemplate,ArrayRef<TemplateArgument> Args,ClassTemplateSpecializationDecl * PrevDecl)884 ClassTemplateSpecializationDecl::Create(ASTContext &Context, TagKind TK,
885 DeclContext *DC,
886 SourceLocation StartLoc,
887 SourceLocation IdLoc,
888 ClassTemplateDecl *SpecializedTemplate,
889 ArrayRef<TemplateArgument> Args,
890 ClassTemplateSpecializationDecl *PrevDecl) {
891 auto *Result =
892 new (Context, DC) ClassTemplateSpecializationDecl(
893 Context, ClassTemplateSpecialization, TK, DC, StartLoc, IdLoc,
894 SpecializedTemplate, Args, PrevDecl);
895 Result->setMayHaveOutOfDateDef(false);
896
897 Context.getTypeDeclType(Result, PrevDecl);
898 return Result;
899 }
900
901 ClassTemplateSpecializationDecl *
CreateDeserialized(ASTContext & C,unsigned ID)902 ClassTemplateSpecializationDecl::CreateDeserialized(ASTContext &C,
903 unsigned ID) {
904 auto *Result =
905 new (C, ID) ClassTemplateSpecializationDecl(C, ClassTemplateSpecialization);
906 Result->setMayHaveOutOfDateDef(false);
907 return Result;
908 }
909
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const910 void ClassTemplateSpecializationDecl::getNameForDiagnostic(
911 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
912 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
913
914 const auto *PS = dyn_cast<ClassTemplatePartialSpecializationDecl>(this);
915 if (const ASTTemplateArgumentListInfo *ArgsAsWritten =
916 PS ? PS->getTemplateArgsAsWritten() : nullptr) {
917 printTemplateArgumentList(OS, ArgsAsWritten->arguments(), Policy);
918 } else {
919 const TemplateArgumentList &TemplateArgs = getTemplateArgs();
920 printTemplateArgumentList(OS, TemplateArgs.asArray(), Policy);
921 }
922 }
923
924 ClassTemplateDecl *
getSpecializedTemplate() const925 ClassTemplateSpecializationDecl::getSpecializedTemplate() const {
926 if (const auto *PartialSpec =
927 SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization*>())
928 return PartialSpec->PartialSpecialization->getSpecializedTemplate();
929 return SpecializedTemplate.get<ClassTemplateDecl*>();
930 }
931
932 SourceRange
getSourceRange() const933 ClassTemplateSpecializationDecl::getSourceRange() const {
934 if (ExplicitInfo) {
935 SourceLocation Begin = getTemplateKeywordLoc();
936 if (Begin.isValid()) {
937 // Here we have an explicit (partial) specialization or instantiation.
938 assert(getSpecializationKind() == TSK_ExplicitSpecialization ||
939 getSpecializationKind() == TSK_ExplicitInstantiationDeclaration ||
940 getSpecializationKind() == TSK_ExplicitInstantiationDefinition);
941 if (getExternLoc().isValid())
942 Begin = getExternLoc();
943 SourceLocation End = getBraceRange().getEnd();
944 if (End.isInvalid())
945 End = getTypeAsWritten()->getTypeLoc().getEndLoc();
946 return SourceRange(Begin, End);
947 }
948 // An implicit instantiation of a class template partial specialization
949 // uses ExplicitInfo to record the TypeAsWritten, but the source
950 // locations should be retrieved from the instantiation pattern.
951 using CTPSDecl = ClassTemplatePartialSpecializationDecl;
952 auto *ctpsd = const_cast<CTPSDecl *>(cast<CTPSDecl>(this));
953 CTPSDecl *inst_from = ctpsd->getInstantiatedFromMember();
954 assert(inst_from != nullptr);
955 return inst_from->getSourceRange();
956 }
957 else {
958 // No explicit info available.
959 llvm::PointerUnion<ClassTemplateDecl *,
960 ClassTemplatePartialSpecializationDecl *>
961 inst_from = getInstantiatedFrom();
962 if (inst_from.isNull())
963 return getSpecializedTemplate()->getSourceRange();
964 if (const auto *ctd = inst_from.dyn_cast<ClassTemplateDecl *>())
965 return ctd->getSourceRange();
966 return inst_from.get<ClassTemplatePartialSpecializationDecl *>()
967 ->getSourceRange();
968 }
969 }
970
971 //===----------------------------------------------------------------------===//
972 // ConceptDecl Implementation
973 //===----------------------------------------------------------------------===//
Create(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,Expr * ConstraintExpr)974 ConceptDecl *ConceptDecl::Create(ASTContext &C, DeclContext *DC,
975 SourceLocation L, DeclarationName Name,
976 TemplateParameterList *Params,
977 Expr *ConstraintExpr) {
978 AdoptTemplateParameterList(Params, DC);
979 return new (C, DC) ConceptDecl(DC, L, Name, Params, ConstraintExpr);
980 }
981
CreateDeserialized(ASTContext & C,unsigned ID)982 ConceptDecl *ConceptDecl::CreateDeserialized(ASTContext &C,
983 unsigned ID) {
984 ConceptDecl *Result = new (C, ID) ConceptDecl(nullptr, SourceLocation(),
985 DeclarationName(),
986 nullptr, nullptr);
987
988 return Result;
989 }
990
991 //===----------------------------------------------------------------------===//
992 // ClassTemplatePartialSpecializationDecl Implementation
993 //===----------------------------------------------------------------------===//
anchor()994 void ClassTemplatePartialSpecializationDecl::anchor() {}
995
996 ClassTemplatePartialSpecializationDecl::
ClassTemplatePartialSpecializationDecl(ASTContext & Context,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,TemplateParameterList * Params,ClassTemplateDecl * SpecializedTemplate,ArrayRef<TemplateArgument> Args,const ASTTemplateArgumentListInfo * ArgInfos,ClassTemplatePartialSpecializationDecl * PrevDecl)997 ClassTemplatePartialSpecializationDecl(ASTContext &Context, TagKind TK,
998 DeclContext *DC,
999 SourceLocation StartLoc,
1000 SourceLocation IdLoc,
1001 TemplateParameterList *Params,
1002 ClassTemplateDecl *SpecializedTemplate,
1003 ArrayRef<TemplateArgument> Args,
1004 const ASTTemplateArgumentListInfo *ArgInfos,
1005 ClassTemplatePartialSpecializationDecl *PrevDecl)
1006 : ClassTemplateSpecializationDecl(Context,
1007 ClassTemplatePartialSpecialization,
1008 TK, DC, StartLoc, IdLoc,
1009 SpecializedTemplate, Args, PrevDecl),
1010 TemplateParams(Params), ArgsAsWritten(ArgInfos),
1011 InstantiatedFromMember(nullptr, false) {
1012 AdoptTemplateParameterList(Params, this);
1013 }
1014
1015 ClassTemplatePartialSpecializationDecl *
1016 ClassTemplatePartialSpecializationDecl::
Create(ASTContext & Context,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,TemplateParameterList * Params,ClassTemplateDecl * SpecializedTemplate,ArrayRef<TemplateArgument> Args,const TemplateArgumentListInfo & ArgInfos,QualType CanonInjectedType,ClassTemplatePartialSpecializationDecl * PrevDecl)1017 Create(ASTContext &Context, TagKind TK,DeclContext *DC,
1018 SourceLocation StartLoc, SourceLocation IdLoc,
1019 TemplateParameterList *Params,
1020 ClassTemplateDecl *SpecializedTemplate,
1021 ArrayRef<TemplateArgument> Args,
1022 const TemplateArgumentListInfo &ArgInfos,
1023 QualType CanonInjectedType,
1024 ClassTemplatePartialSpecializationDecl *PrevDecl) {
1025 const ASTTemplateArgumentListInfo *ASTArgInfos =
1026 ASTTemplateArgumentListInfo::Create(Context, ArgInfos);
1027
1028 auto *Result = new (Context, DC)
1029 ClassTemplatePartialSpecializationDecl(Context, TK, DC, StartLoc, IdLoc,
1030 Params, SpecializedTemplate, Args,
1031 ASTArgInfos, PrevDecl);
1032 Result->setSpecializationKind(TSK_ExplicitSpecialization);
1033 Result->setMayHaveOutOfDateDef(false);
1034
1035 Context.getInjectedClassNameType(Result, CanonInjectedType);
1036 return Result;
1037 }
1038
1039 ClassTemplatePartialSpecializationDecl *
CreateDeserialized(ASTContext & C,unsigned ID)1040 ClassTemplatePartialSpecializationDecl::CreateDeserialized(ASTContext &C,
1041 unsigned ID) {
1042 auto *Result = new (C, ID) ClassTemplatePartialSpecializationDecl(C);
1043 Result->setMayHaveOutOfDateDef(false);
1044 return Result;
1045 }
1046
1047 //===----------------------------------------------------------------------===//
1048 // FriendTemplateDecl Implementation
1049 //===----------------------------------------------------------------------===//
1050
anchor()1051 void FriendTemplateDecl::anchor() {}
1052
1053 FriendTemplateDecl *
Create(ASTContext & Context,DeclContext * DC,SourceLocation L,MutableArrayRef<TemplateParameterList * > Params,FriendUnion Friend,SourceLocation FLoc)1054 FriendTemplateDecl::Create(ASTContext &Context, DeclContext *DC,
1055 SourceLocation L,
1056 MutableArrayRef<TemplateParameterList *> Params,
1057 FriendUnion Friend, SourceLocation FLoc) {
1058 return new (Context, DC) FriendTemplateDecl(DC, L, Params, Friend, FLoc);
1059 }
1060
CreateDeserialized(ASTContext & C,unsigned ID)1061 FriendTemplateDecl *FriendTemplateDecl::CreateDeserialized(ASTContext &C,
1062 unsigned ID) {
1063 return new (C, ID) FriendTemplateDecl(EmptyShell());
1064 }
1065
1066 //===----------------------------------------------------------------------===//
1067 // TypeAliasTemplateDecl Implementation
1068 //===----------------------------------------------------------------------===//
1069
Create(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,NamedDecl * Decl)1070 TypeAliasTemplateDecl *TypeAliasTemplateDecl::Create(ASTContext &C,
1071 DeclContext *DC,
1072 SourceLocation L,
1073 DeclarationName Name,
1074 TemplateParameterList *Params,
1075 NamedDecl *Decl) {
1076 AdoptTemplateParameterList(Params, DC);
1077 return new (C, DC) TypeAliasTemplateDecl(C, DC, L, Name, Params, Decl);
1078 }
1079
CreateDeserialized(ASTContext & C,unsigned ID)1080 TypeAliasTemplateDecl *TypeAliasTemplateDecl::CreateDeserialized(ASTContext &C,
1081 unsigned ID) {
1082 return new (C, ID) TypeAliasTemplateDecl(C, nullptr, SourceLocation(),
1083 DeclarationName(), nullptr, nullptr);
1084 }
1085
1086 RedeclarableTemplateDecl::CommonBase *
newCommon(ASTContext & C) const1087 TypeAliasTemplateDecl::newCommon(ASTContext &C) const {
1088 auto *CommonPtr = new (C) Common;
1089 C.addDestruction(CommonPtr);
1090 return CommonPtr;
1091 }
1092
1093 //===----------------------------------------------------------------------===//
1094 // ClassScopeFunctionSpecializationDecl Implementation
1095 //===----------------------------------------------------------------------===//
1096
anchor()1097 void ClassScopeFunctionSpecializationDecl::anchor() {}
1098
1099 ClassScopeFunctionSpecializationDecl *
CreateDeserialized(ASTContext & C,unsigned ID)1100 ClassScopeFunctionSpecializationDecl::CreateDeserialized(ASTContext &C,
1101 unsigned ID) {
1102 return new (C, ID) ClassScopeFunctionSpecializationDecl(
1103 nullptr, SourceLocation(), nullptr, nullptr);
1104 }
1105
1106 //===----------------------------------------------------------------------===//
1107 // VarTemplateDecl Implementation
1108 //===----------------------------------------------------------------------===//
1109
getDefinition()1110 VarTemplateDecl *VarTemplateDecl::getDefinition() {
1111 VarTemplateDecl *CurD = this;
1112 while (CurD) {
1113 if (CurD->isThisDeclarationADefinition())
1114 return CurD;
1115 CurD = CurD->getPreviousDecl();
1116 }
1117 return nullptr;
1118 }
1119
Create(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName Name,TemplateParameterList * Params,VarDecl * Decl)1120 VarTemplateDecl *VarTemplateDecl::Create(ASTContext &C, DeclContext *DC,
1121 SourceLocation L, DeclarationName Name,
1122 TemplateParameterList *Params,
1123 VarDecl *Decl) {
1124 AdoptTemplateParameterList(Params, DC);
1125 return new (C, DC) VarTemplateDecl(C, DC, L, Name, Params, Decl);
1126 }
1127
CreateDeserialized(ASTContext & C,unsigned ID)1128 VarTemplateDecl *VarTemplateDecl::CreateDeserialized(ASTContext &C,
1129 unsigned ID) {
1130 return new (C, ID) VarTemplateDecl(C, nullptr, SourceLocation(),
1131 DeclarationName(), nullptr, nullptr);
1132 }
1133
LoadLazySpecializations() const1134 void VarTemplateDecl::LoadLazySpecializations() const {
1135 loadLazySpecializationsImpl();
1136 }
1137
1138 llvm::FoldingSetVector<VarTemplateSpecializationDecl> &
getSpecializations() const1139 VarTemplateDecl::getSpecializations() const {
1140 LoadLazySpecializations();
1141 return getCommonPtr()->Specializations;
1142 }
1143
1144 llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &
getPartialSpecializations()1145 VarTemplateDecl::getPartialSpecializations() {
1146 LoadLazySpecializations();
1147 return getCommonPtr()->PartialSpecializations;
1148 }
1149
1150 RedeclarableTemplateDecl::CommonBase *
newCommon(ASTContext & C) const1151 VarTemplateDecl::newCommon(ASTContext &C) const {
1152 auto *CommonPtr = new (C) Common;
1153 C.addDestruction(CommonPtr);
1154 return CommonPtr;
1155 }
1156
1157 VarTemplateSpecializationDecl *
findSpecialization(ArrayRef<TemplateArgument> Args,void * & InsertPos)1158 VarTemplateDecl::findSpecialization(ArrayRef<TemplateArgument> Args,
1159 void *&InsertPos) {
1160 return findSpecializationImpl(getSpecializations(), InsertPos, Args);
1161 }
1162
AddSpecialization(VarTemplateSpecializationDecl * D,void * InsertPos)1163 void VarTemplateDecl::AddSpecialization(VarTemplateSpecializationDecl *D,
1164 void *InsertPos) {
1165 addSpecializationImpl<VarTemplateDecl>(getSpecializations(), D, InsertPos);
1166 }
1167
1168 VarTemplatePartialSpecializationDecl *
findPartialSpecialization(ArrayRef<TemplateArgument> Args,TemplateParameterList * TPL,void * & InsertPos)1169 VarTemplateDecl::findPartialSpecialization(ArrayRef<TemplateArgument> Args,
1170 TemplateParameterList *TPL, void *&InsertPos) {
1171 return findSpecializationImpl(getPartialSpecializations(), InsertPos, Args,
1172 TPL);
1173 }
1174
1175 void
Profile(llvm::FoldingSetNodeID & ID,ArrayRef<TemplateArgument> TemplateArgs,TemplateParameterList * TPL,ASTContext & Context)1176 VarTemplatePartialSpecializationDecl::Profile(llvm::FoldingSetNodeID &ID,
1177 ArrayRef<TemplateArgument> TemplateArgs, TemplateParameterList *TPL,
1178 ASTContext &Context) {
1179 ID.AddInteger(TemplateArgs.size());
1180 for (const TemplateArgument &TemplateArg : TemplateArgs)
1181 TemplateArg.Profile(ID, Context);
1182 ProfileTemplateParameterList(Context, ID, TPL);
1183 }
1184
AddPartialSpecialization(VarTemplatePartialSpecializationDecl * D,void * InsertPos)1185 void VarTemplateDecl::AddPartialSpecialization(
1186 VarTemplatePartialSpecializationDecl *D, void *InsertPos) {
1187 if (InsertPos)
1188 getPartialSpecializations().InsertNode(D, InsertPos);
1189 else {
1190 VarTemplatePartialSpecializationDecl *Existing =
1191 getPartialSpecializations().GetOrInsertNode(D);
1192 (void)Existing;
1193 assert(Existing->isCanonicalDecl() && "Non-canonical specialization?");
1194 }
1195
1196 if (ASTMutationListener *L = getASTMutationListener())
1197 L->AddedCXXTemplateSpecialization(this, D);
1198 }
1199
getPartialSpecializations(SmallVectorImpl<VarTemplatePartialSpecializationDecl * > & PS)1200 void VarTemplateDecl::getPartialSpecializations(
1201 SmallVectorImpl<VarTemplatePartialSpecializationDecl *> &PS) {
1202 llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &PartialSpecs =
1203 getPartialSpecializations();
1204 PS.clear();
1205 PS.reserve(PartialSpecs.size());
1206 for (VarTemplatePartialSpecializationDecl &P : PartialSpecs)
1207 PS.push_back(P.getMostRecentDecl());
1208 }
1209
1210 VarTemplatePartialSpecializationDecl *
findPartialSpecInstantiatedFromMember(VarTemplatePartialSpecializationDecl * D)1211 VarTemplateDecl::findPartialSpecInstantiatedFromMember(
1212 VarTemplatePartialSpecializationDecl *D) {
1213 Decl *DCanon = D->getCanonicalDecl();
1214 for (VarTemplatePartialSpecializationDecl &P : getPartialSpecializations()) {
1215 if (P.getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
1216 return P.getMostRecentDecl();
1217 }
1218
1219 return nullptr;
1220 }
1221
1222 //===----------------------------------------------------------------------===//
1223 // VarTemplateSpecializationDecl Implementation
1224 //===----------------------------------------------------------------------===//
1225
VarTemplateSpecializationDecl(Kind DK,ASTContext & Context,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,VarTemplateDecl * SpecializedTemplate,QualType T,TypeSourceInfo * TInfo,StorageClass S,ArrayRef<TemplateArgument> Args)1226 VarTemplateSpecializationDecl::VarTemplateSpecializationDecl(
1227 Kind DK, ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
1228 SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T,
1229 TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args)
1230 : VarDecl(DK, Context, DC, StartLoc, IdLoc,
1231 SpecializedTemplate->getIdentifier(), T, TInfo, S),
1232 SpecializedTemplate(SpecializedTemplate),
1233 TemplateArgs(TemplateArgumentList::CreateCopy(Context, Args)),
1234 SpecializationKind(TSK_Undeclared), IsCompleteDefinition(false) {}
1235
VarTemplateSpecializationDecl(Kind DK,ASTContext & C)1236 VarTemplateSpecializationDecl::VarTemplateSpecializationDecl(Kind DK,
1237 ASTContext &C)
1238 : VarDecl(DK, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1239 QualType(), nullptr, SC_None),
1240 SpecializationKind(TSK_Undeclared), IsCompleteDefinition(false) {}
1241
Create(ASTContext & Context,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,VarTemplateDecl * SpecializedTemplate,QualType T,TypeSourceInfo * TInfo,StorageClass S,ArrayRef<TemplateArgument> Args)1242 VarTemplateSpecializationDecl *VarTemplateSpecializationDecl::Create(
1243 ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
1244 SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T,
1245 TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args) {
1246 return new (Context, DC) VarTemplateSpecializationDecl(
1247 VarTemplateSpecialization, Context, DC, StartLoc, IdLoc,
1248 SpecializedTemplate, T, TInfo, S, Args);
1249 }
1250
1251 VarTemplateSpecializationDecl *
CreateDeserialized(ASTContext & C,unsigned ID)1252 VarTemplateSpecializationDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1253 return new (C, ID)
1254 VarTemplateSpecializationDecl(VarTemplateSpecialization, C);
1255 }
1256
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const1257 void VarTemplateSpecializationDecl::getNameForDiagnostic(
1258 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
1259 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
1260
1261 const auto *PS = dyn_cast<VarTemplatePartialSpecializationDecl>(this);
1262 if (const ASTTemplateArgumentListInfo *ArgsAsWritten =
1263 PS ? PS->getTemplateArgsAsWritten() : nullptr) {
1264 printTemplateArgumentList(OS, ArgsAsWritten->arguments(), Policy);
1265 } else {
1266 const TemplateArgumentList &TemplateArgs = getTemplateArgs();
1267 printTemplateArgumentList(OS, TemplateArgs.asArray(), Policy);
1268 }
1269 }
1270
getSpecializedTemplate() const1271 VarTemplateDecl *VarTemplateSpecializationDecl::getSpecializedTemplate() const {
1272 if (const auto *PartialSpec =
1273 SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
1274 return PartialSpec->PartialSpecialization->getSpecializedTemplate();
1275 return SpecializedTemplate.get<VarTemplateDecl *>();
1276 }
1277
setTemplateArgsInfo(const TemplateArgumentListInfo & ArgsInfo)1278 void VarTemplateSpecializationDecl::setTemplateArgsInfo(
1279 const TemplateArgumentListInfo &ArgsInfo) {
1280 TemplateArgsInfo.setLAngleLoc(ArgsInfo.getLAngleLoc());
1281 TemplateArgsInfo.setRAngleLoc(ArgsInfo.getRAngleLoc());
1282 for (const TemplateArgumentLoc &Loc : ArgsInfo.arguments())
1283 TemplateArgsInfo.addArgument(Loc);
1284 }
1285
1286 //===----------------------------------------------------------------------===//
1287 // VarTemplatePartialSpecializationDecl Implementation
1288 //===----------------------------------------------------------------------===//
1289
anchor()1290 void VarTemplatePartialSpecializationDecl::anchor() {}
1291
VarTemplatePartialSpecializationDecl(ASTContext & Context,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,TemplateParameterList * Params,VarTemplateDecl * SpecializedTemplate,QualType T,TypeSourceInfo * TInfo,StorageClass S,ArrayRef<TemplateArgument> Args,const ASTTemplateArgumentListInfo * ArgInfos)1292 VarTemplatePartialSpecializationDecl::VarTemplatePartialSpecializationDecl(
1293 ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
1294 SourceLocation IdLoc, TemplateParameterList *Params,
1295 VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo,
1296 StorageClass S, ArrayRef<TemplateArgument> Args,
1297 const ASTTemplateArgumentListInfo *ArgInfos)
1298 : VarTemplateSpecializationDecl(VarTemplatePartialSpecialization, Context,
1299 DC, StartLoc, IdLoc, SpecializedTemplate, T,
1300 TInfo, S, Args),
1301 TemplateParams(Params), ArgsAsWritten(ArgInfos),
1302 InstantiatedFromMember(nullptr, false) {
1303 // TODO: The template parameters should be in DC by now. Verify.
1304 // AdoptTemplateParameterList(Params, DC);
1305 }
1306
1307 VarTemplatePartialSpecializationDecl *
Create(ASTContext & Context,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,TemplateParameterList * Params,VarTemplateDecl * SpecializedTemplate,QualType T,TypeSourceInfo * TInfo,StorageClass S,ArrayRef<TemplateArgument> Args,const TemplateArgumentListInfo & ArgInfos)1308 VarTemplatePartialSpecializationDecl::Create(
1309 ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
1310 SourceLocation IdLoc, TemplateParameterList *Params,
1311 VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo,
1312 StorageClass S, ArrayRef<TemplateArgument> Args,
1313 const TemplateArgumentListInfo &ArgInfos) {
1314 const ASTTemplateArgumentListInfo *ASTArgInfos
1315 = ASTTemplateArgumentListInfo::Create(Context, ArgInfos);
1316
1317 auto *Result =
1318 new (Context, DC) VarTemplatePartialSpecializationDecl(
1319 Context, DC, StartLoc, IdLoc, Params, SpecializedTemplate, T, TInfo,
1320 S, Args, ASTArgInfos);
1321 Result->setSpecializationKind(TSK_ExplicitSpecialization);
1322 return Result;
1323 }
1324
1325 VarTemplatePartialSpecializationDecl *
CreateDeserialized(ASTContext & C,unsigned ID)1326 VarTemplatePartialSpecializationDecl::CreateDeserialized(ASTContext &C,
1327 unsigned ID) {
1328 return new (C, ID) VarTemplatePartialSpecializationDecl(C);
1329 }
1330
1331 static TemplateParameterList *
createMakeIntegerSeqParameterList(const ASTContext & C,DeclContext * DC)1332 createMakeIntegerSeqParameterList(const ASTContext &C, DeclContext *DC) {
1333 // typename T
1334 auto *T = TemplateTypeParmDecl::Create(
1335 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/1, /*Position=*/0,
1336 /*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/false,
1337 /*HasTypeConstraint=*/false);
1338 T->setImplicit(true);
1339
1340 // T ...Ints
1341 TypeSourceInfo *TI =
1342 C.getTrivialTypeSourceInfo(QualType(T->getTypeForDecl(), 0));
1343 auto *N = NonTypeTemplateParmDecl::Create(
1344 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
1345 /*Id=*/nullptr, TI->getType(), /*ParameterPack=*/true, TI);
1346 N->setImplicit(true);
1347
1348 // <typename T, T ...Ints>
1349 NamedDecl *P[2] = {T, N};
1350 auto *TPL = TemplateParameterList::Create(
1351 C, SourceLocation(), SourceLocation(), P, SourceLocation(), nullptr);
1352
1353 // template <typename T, ...Ints> class IntSeq
1354 auto *TemplateTemplateParm = TemplateTemplateParmDecl::Create(
1355 C, DC, SourceLocation(), /*Depth=*/0, /*Position=*/0,
1356 /*ParameterPack=*/false, /*Id=*/nullptr, TPL);
1357 TemplateTemplateParm->setImplicit(true);
1358
1359 // typename T
1360 auto *TemplateTypeParm = TemplateTypeParmDecl::Create(
1361 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
1362 /*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/false,
1363 /*HasTypeConstraint=*/false);
1364 TemplateTypeParm->setImplicit(true);
1365
1366 // T N
1367 TypeSourceInfo *TInfo = C.getTrivialTypeSourceInfo(
1368 QualType(TemplateTypeParm->getTypeForDecl(), 0));
1369 auto *NonTypeTemplateParm = NonTypeTemplateParmDecl::Create(
1370 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/2,
1371 /*Id=*/nullptr, TInfo->getType(), /*ParameterPack=*/false, TInfo);
1372 NamedDecl *Params[] = {TemplateTemplateParm, TemplateTypeParm,
1373 NonTypeTemplateParm};
1374
1375 // template <template <typename T, T ...Ints> class IntSeq, typename T, T N>
1376 return TemplateParameterList::Create(C, SourceLocation(), SourceLocation(),
1377 Params, SourceLocation(), nullptr);
1378 }
1379
1380 static TemplateParameterList *
createTypePackElementParameterList(const ASTContext & C,DeclContext * DC)1381 createTypePackElementParameterList(const ASTContext &C, DeclContext *DC) {
1382 // std::size_t Index
1383 TypeSourceInfo *TInfo = C.getTrivialTypeSourceInfo(C.getSizeType());
1384 auto *Index = NonTypeTemplateParmDecl::Create(
1385 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/0,
1386 /*Id=*/nullptr, TInfo->getType(), /*ParameterPack=*/false, TInfo);
1387
1388 // typename ...T
1389 auto *Ts = TemplateTypeParmDecl::Create(
1390 C, DC, SourceLocation(), SourceLocation(), /*Depth=*/0, /*Position=*/1,
1391 /*Id=*/nullptr, /*Typename=*/true, /*ParameterPack=*/true,
1392 /*HasTypeConstraint=*/false);
1393 Ts->setImplicit(true);
1394
1395 // template <std::size_t Index, typename ...T>
1396 NamedDecl *Params[] = {Index, Ts};
1397 return TemplateParameterList::Create(C, SourceLocation(), SourceLocation(),
1398 llvm::makeArrayRef(Params),
1399 SourceLocation(), nullptr);
1400 }
1401
createBuiltinTemplateParameterList(const ASTContext & C,DeclContext * DC,BuiltinTemplateKind BTK)1402 static TemplateParameterList *createBuiltinTemplateParameterList(
1403 const ASTContext &C, DeclContext *DC, BuiltinTemplateKind BTK) {
1404 switch (BTK) {
1405 case BTK__make_integer_seq:
1406 return createMakeIntegerSeqParameterList(C, DC);
1407 case BTK__type_pack_element:
1408 return createTypePackElementParameterList(C, DC);
1409 }
1410
1411 llvm_unreachable("unhandled BuiltinTemplateKind!");
1412 }
1413
anchor()1414 void BuiltinTemplateDecl::anchor() {}
1415
BuiltinTemplateDecl(const ASTContext & C,DeclContext * DC,DeclarationName Name,BuiltinTemplateKind BTK)1416 BuiltinTemplateDecl::BuiltinTemplateDecl(const ASTContext &C, DeclContext *DC,
1417 DeclarationName Name,
1418 BuiltinTemplateKind BTK)
1419 : TemplateDecl(BuiltinTemplate, DC, SourceLocation(), Name,
1420 createBuiltinTemplateParameterList(C, DC, BTK)),
1421 BTK(BTK) {}
1422
print(llvm::raw_ostream & OS,PrintingPolicy Policy) const1423 void TypeConstraint::print(llvm::raw_ostream &OS, PrintingPolicy Policy) const {
1424 if (NestedNameSpec)
1425 NestedNameSpec.getNestedNameSpecifier()->print(OS, Policy);
1426 ConceptName.printName(OS, Policy);
1427 if (hasExplicitTemplateArgs()) {
1428 OS << "<";
1429 for (auto &ArgLoc : ArgsAsWritten->arguments())
1430 ArgLoc.getArgument().print(Policy, OS);
1431 OS << ">";
1432 }
1433 }
1434