1 //===------- SemaTemplateInstantiate.cpp - C++ Template Instantiation ------===/ 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 //===----------------------------------------------------------------------===/ 8 // 9 // This file implements C++ template instantiation. 10 // 11 //===----------------------------------------------------------------------===/ 12 13 #include "clang/Sema/SemaInternal.h" 14 #include "TreeTransform.h" 15 #include "clang/Sema/DeclSpec.h" 16 #include "clang/Sema/Initialization.h" 17 #include "clang/Sema/Lookup.h" 18 #include "clang/Sema/Template.h" 19 #include "clang/Sema/TemplateDeduction.h" 20 #include "clang/AST/ASTConsumer.h" 21 #include "clang/AST/ASTContext.h" 22 #include "clang/AST/Expr.h" 23 #include "clang/AST/DeclTemplate.h" 24 #include "clang/Basic/LangOptions.h" 25 26 using namespace clang; 27 using namespace sema; 28 29 //===----------------------------------------------------------------------===/ 30 // Template Instantiation Support 31 //===----------------------------------------------------------------------===/ 32 33 /// \brief Retrieve the template argument list(s) that should be used to 34 /// instantiate the definition of the given declaration. 35 /// 36 /// \param D the declaration for which we are computing template instantiation 37 /// arguments. 38 /// 39 /// \param Innermost if non-NULL, the innermost template argument list. 40 /// 41 /// \param RelativeToPrimary true if we should get the template 42 /// arguments relative to the primary template, even when we're 43 /// dealing with a specialization. This is only relevant for function 44 /// template specializations. 45 /// 46 /// \param Pattern If non-NULL, indicates the pattern from which we will be 47 /// instantiating the definition of the given declaration, \p D. This is 48 /// used to determine the proper set of template instantiation arguments for 49 /// friend function template specializations. 50 MultiLevelTemplateArgumentList 51 Sema::getTemplateInstantiationArgs(NamedDecl *D, 52 const TemplateArgumentList *Innermost, 53 bool RelativeToPrimary, 54 const FunctionDecl *Pattern) { 55 // Accumulate the set of template argument lists in this structure. 56 MultiLevelTemplateArgumentList Result; 57 58 if (Innermost) 59 Result.addOuterTemplateArguments(Innermost); 60 61 DeclContext *Ctx = dyn_cast<DeclContext>(D); 62 if (!Ctx) { 63 Ctx = D->getDeclContext(); 64 65 // If we have a template template parameter with translation unit context, 66 // then we're performing substitution into a default template argument of 67 // this template template parameter before we've constructed the template 68 // that will own this template template parameter. In this case, we 69 // use empty template parameter lists for all of the outer templates 70 // to avoid performing any substitutions. 71 if (Ctx->isTranslationUnit()) { 72 if (TemplateTemplateParmDecl *TTP 73 = dyn_cast<TemplateTemplateParmDecl>(D)) { 74 for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I) 75 Result.addOuterTemplateArguments(0, 0); 76 return Result; 77 } 78 } 79 } 80 81 while (!Ctx->isFileContext()) { 82 // Add template arguments from a class template instantiation. 83 if (ClassTemplateSpecializationDecl *Spec 84 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx)) { 85 // We're done when we hit an explicit specialization. 86 if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization && 87 !isa<ClassTemplatePartialSpecializationDecl>(Spec)) 88 break; 89 90 Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs()); 91 92 // If this class template specialization was instantiated from a 93 // specialized member that is a class template, we're done. 94 assert(Spec->getSpecializedTemplate() && "No class template?"); 95 if (Spec->getSpecializedTemplate()->isMemberSpecialization()) 96 break; 97 } 98 // Add template arguments from a function template specialization. 99 else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) { 100 if (!RelativeToPrimary && 101 (Function->getTemplateSpecializationKind() == 102 TSK_ExplicitSpecialization && 103 !Function->getClassScopeSpecializationPattern())) 104 break; 105 106 if (const TemplateArgumentList *TemplateArgs 107 = Function->getTemplateSpecializationArgs()) { 108 // Add the template arguments for this specialization. 109 Result.addOuterTemplateArguments(TemplateArgs); 110 111 // If this function was instantiated from a specialized member that is 112 // a function template, we're done. 113 assert(Function->getPrimaryTemplate() && "No function template?"); 114 if (Function->getPrimaryTemplate()->isMemberSpecialization()) 115 break; 116 } else if (FunctionTemplateDecl *FunTmpl 117 = Function->getDescribedFunctionTemplate()) { 118 // Add the "injected" template arguments. 119 std::pair<const TemplateArgument *, unsigned> 120 Injected = FunTmpl->getInjectedTemplateArgs(); 121 Result.addOuterTemplateArguments(Injected.first, Injected.second); 122 } 123 124 // If this is a friend declaration and it declares an entity at 125 // namespace scope, take arguments from its lexical parent 126 // instead of its semantic parent, unless of course the pattern we're 127 // instantiating actually comes from the file's context! 128 if (Function->getFriendObjectKind() && 129 Function->getDeclContext()->isFileContext() && 130 (!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) { 131 Ctx = Function->getLexicalDeclContext(); 132 RelativeToPrimary = false; 133 continue; 134 } 135 } else if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Ctx)) { 136 if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) { 137 QualType T = ClassTemplate->getInjectedClassNameSpecialization(); 138 const TemplateSpecializationType *TST 139 = cast<TemplateSpecializationType>(Context.getCanonicalType(T)); 140 Result.addOuterTemplateArguments(TST->getArgs(), TST->getNumArgs()); 141 if (ClassTemplate->isMemberSpecialization()) 142 break; 143 } 144 } 145 146 Ctx = Ctx->getParent(); 147 RelativeToPrimary = false; 148 } 149 150 return Result; 151 } 152 153 bool Sema::ActiveTemplateInstantiation::isInstantiationRecord() const { 154 switch (Kind) { 155 case TemplateInstantiation: 156 case DefaultTemplateArgumentInstantiation: 157 case DefaultFunctionArgumentInstantiation: 158 return true; 159 160 case ExplicitTemplateArgumentSubstitution: 161 case DeducedTemplateArgumentSubstitution: 162 case PriorTemplateArgumentSubstitution: 163 case DefaultTemplateArgumentChecking: 164 return false; 165 } 166 167 return true; 168 } 169 170 Sema::InstantiatingTemplate:: 171 InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, 172 Decl *Entity, 173 SourceRange InstantiationRange) 174 : SemaRef(SemaRef), 175 SavedInNonInstantiationSFINAEContext( 176 SemaRef.InNonInstantiationSFINAEContext) 177 { 178 Invalid = CheckInstantiationDepth(PointOfInstantiation, 179 InstantiationRange); 180 if (!Invalid) { 181 ActiveTemplateInstantiation Inst; 182 Inst.Kind = ActiveTemplateInstantiation::TemplateInstantiation; 183 Inst.PointOfInstantiation = PointOfInstantiation; 184 Inst.Entity = reinterpret_cast<uintptr_t>(Entity); 185 Inst.TemplateArgs = 0; 186 Inst.NumTemplateArgs = 0; 187 Inst.InstantiationRange = InstantiationRange; 188 SemaRef.InNonInstantiationSFINAEContext = false; 189 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 190 } 191 } 192 193 Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, 194 SourceLocation PointOfInstantiation, 195 TemplateDecl *Template, 196 const TemplateArgument *TemplateArgs, 197 unsigned NumTemplateArgs, 198 SourceRange InstantiationRange) 199 : SemaRef(SemaRef), 200 SavedInNonInstantiationSFINAEContext( 201 SemaRef.InNonInstantiationSFINAEContext) 202 { 203 Invalid = CheckInstantiationDepth(PointOfInstantiation, 204 InstantiationRange); 205 if (!Invalid) { 206 ActiveTemplateInstantiation Inst; 207 Inst.Kind 208 = ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation; 209 Inst.PointOfInstantiation = PointOfInstantiation; 210 Inst.Entity = reinterpret_cast<uintptr_t>(Template); 211 Inst.TemplateArgs = TemplateArgs; 212 Inst.NumTemplateArgs = NumTemplateArgs; 213 Inst.InstantiationRange = InstantiationRange; 214 SemaRef.InNonInstantiationSFINAEContext = false; 215 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 216 } 217 } 218 219 Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, 220 SourceLocation PointOfInstantiation, 221 FunctionTemplateDecl *FunctionTemplate, 222 const TemplateArgument *TemplateArgs, 223 unsigned NumTemplateArgs, 224 ActiveTemplateInstantiation::InstantiationKind Kind, 225 sema::TemplateDeductionInfo &DeductionInfo, 226 SourceRange InstantiationRange) 227 : SemaRef(SemaRef), 228 SavedInNonInstantiationSFINAEContext( 229 SemaRef.InNonInstantiationSFINAEContext) 230 { 231 Invalid = CheckInstantiationDepth(PointOfInstantiation, 232 InstantiationRange); 233 if (!Invalid) { 234 ActiveTemplateInstantiation Inst; 235 Inst.Kind = Kind; 236 Inst.PointOfInstantiation = PointOfInstantiation; 237 Inst.Entity = reinterpret_cast<uintptr_t>(FunctionTemplate); 238 Inst.TemplateArgs = TemplateArgs; 239 Inst.NumTemplateArgs = NumTemplateArgs; 240 Inst.DeductionInfo = &DeductionInfo; 241 Inst.InstantiationRange = InstantiationRange; 242 SemaRef.InNonInstantiationSFINAEContext = false; 243 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 244 245 if (!Inst.isInstantiationRecord()) 246 ++SemaRef.NonInstantiationEntries; 247 } 248 } 249 250 Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, 251 SourceLocation PointOfInstantiation, 252 ClassTemplatePartialSpecializationDecl *PartialSpec, 253 const TemplateArgument *TemplateArgs, 254 unsigned NumTemplateArgs, 255 sema::TemplateDeductionInfo &DeductionInfo, 256 SourceRange InstantiationRange) 257 : SemaRef(SemaRef), 258 SavedInNonInstantiationSFINAEContext( 259 SemaRef.InNonInstantiationSFINAEContext) 260 { 261 Invalid = false; 262 263 ActiveTemplateInstantiation Inst; 264 Inst.Kind = ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution; 265 Inst.PointOfInstantiation = PointOfInstantiation; 266 Inst.Entity = reinterpret_cast<uintptr_t>(PartialSpec); 267 Inst.TemplateArgs = TemplateArgs; 268 Inst.NumTemplateArgs = NumTemplateArgs; 269 Inst.DeductionInfo = &DeductionInfo; 270 Inst.InstantiationRange = InstantiationRange; 271 SemaRef.InNonInstantiationSFINAEContext = false; 272 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 273 274 assert(!Inst.isInstantiationRecord()); 275 ++SemaRef.NonInstantiationEntries; 276 } 277 278 Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, 279 SourceLocation PointOfInstantiation, 280 ParmVarDecl *Param, 281 const TemplateArgument *TemplateArgs, 282 unsigned NumTemplateArgs, 283 SourceRange InstantiationRange) 284 : SemaRef(SemaRef), 285 SavedInNonInstantiationSFINAEContext( 286 SemaRef.InNonInstantiationSFINAEContext) 287 { 288 Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange); 289 290 if (!Invalid) { 291 ActiveTemplateInstantiation Inst; 292 Inst.Kind 293 = ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation; 294 Inst.PointOfInstantiation = PointOfInstantiation; 295 Inst.Entity = reinterpret_cast<uintptr_t>(Param); 296 Inst.TemplateArgs = TemplateArgs; 297 Inst.NumTemplateArgs = NumTemplateArgs; 298 Inst.InstantiationRange = InstantiationRange; 299 SemaRef.InNonInstantiationSFINAEContext = false; 300 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 301 } 302 } 303 304 Sema::InstantiatingTemplate:: 305 InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, 306 NamedDecl *Template, 307 NonTypeTemplateParmDecl *Param, 308 const TemplateArgument *TemplateArgs, 309 unsigned NumTemplateArgs, 310 SourceRange InstantiationRange) 311 : SemaRef(SemaRef), 312 SavedInNonInstantiationSFINAEContext( 313 SemaRef.InNonInstantiationSFINAEContext) 314 { 315 Invalid = false; 316 317 ActiveTemplateInstantiation Inst; 318 Inst.Kind = ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution; 319 Inst.PointOfInstantiation = PointOfInstantiation; 320 Inst.Template = Template; 321 Inst.Entity = reinterpret_cast<uintptr_t>(Param); 322 Inst.TemplateArgs = TemplateArgs; 323 Inst.NumTemplateArgs = NumTemplateArgs; 324 Inst.InstantiationRange = InstantiationRange; 325 SemaRef.InNonInstantiationSFINAEContext = false; 326 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 327 328 assert(!Inst.isInstantiationRecord()); 329 ++SemaRef.NonInstantiationEntries; 330 } 331 332 Sema::InstantiatingTemplate:: 333 InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, 334 NamedDecl *Template, 335 TemplateTemplateParmDecl *Param, 336 const TemplateArgument *TemplateArgs, 337 unsigned NumTemplateArgs, 338 SourceRange InstantiationRange) 339 : SemaRef(SemaRef), 340 SavedInNonInstantiationSFINAEContext( 341 SemaRef.InNonInstantiationSFINAEContext) 342 { 343 Invalid = false; 344 ActiveTemplateInstantiation Inst; 345 Inst.Kind = ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution; 346 Inst.PointOfInstantiation = PointOfInstantiation; 347 Inst.Template = Template; 348 Inst.Entity = reinterpret_cast<uintptr_t>(Param); 349 Inst.TemplateArgs = TemplateArgs; 350 Inst.NumTemplateArgs = NumTemplateArgs; 351 Inst.InstantiationRange = InstantiationRange; 352 SemaRef.InNonInstantiationSFINAEContext = false; 353 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 354 355 assert(!Inst.isInstantiationRecord()); 356 ++SemaRef.NonInstantiationEntries; 357 } 358 359 Sema::InstantiatingTemplate:: 360 InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, 361 TemplateDecl *Template, 362 NamedDecl *Param, 363 const TemplateArgument *TemplateArgs, 364 unsigned NumTemplateArgs, 365 SourceRange InstantiationRange) 366 : SemaRef(SemaRef), 367 SavedInNonInstantiationSFINAEContext( 368 SemaRef.InNonInstantiationSFINAEContext) 369 { 370 Invalid = false; 371 372 ActiveTemplateInstantiation Inst; 373 Inst.Kind = ActiveTemplateInstantiation::DefaultTemplateArgumentChecking; 374 Inst.PointOfInstantiation = PointOfInstantiation; 375 Inst.Template = Template; 376 Inst.Entity = reinterpret_cast<uintptr_t>(Param); 377 Inst.TemplateArgs = TemplateArgs; 378 Inst.NumTemplateArgs = NumTemplateArgs; 379 Inst.InstantiationRange = InstantiationRange; 380 SemaRef.InNonInstantiationSFINAEContext = false; 381 SemaRef.ActiveTemplateInstantiations.push_back(Inst); 382 383 assert(!Inst.isInstantiationRecord()); 384 ++SemaRef.NonInstantiationEntries; 385 } 386 387 void Sema::InstantiatingTemplate::Clear() { 388 if (!Invalid) { 389 if (!SemaRef.ActiveTemplateInstantiations.back().isInstantiationRecord()) { 390 assert(SemaRef.NonInstantiationEntries > 0); 391 --SemaRef.NonInstantiationEntries; 392 } 393 SemaRef.InNonInstantiationSFINAEContext 394 = SavedInNonInstantiationSFINAEContext; 395 SemaRef.ActiveTemplateInstantiations.pop_back(); 396 Invalid = true; 397 } 398 } 399 400 bool Sema::InstantiatingTemplate::CheckInstantiationDepth( 401 SourceLocation PointOfInstantiation, 402 SourceRange InstantiationRange) { 403 assert(SemaRef.NonInstantiationEntries <= 404 SemaRef.ActiveTemplateInstantiations.size()); 405 if ((SemaRef.ActiveTemplateInstantiations.size() - 406 SemaRef.NonInstantiationEntries) 407 <= SemaRef.getLangOptions().InstantiationDepth) 408 return false; 409 410 SemaRef.Diag(PointOfInstantiation, 411 diag::err_template_recursion_depth_exceeded) 412 << SemaRef.getLangOptions().InstantiationDepth 413 << InstantiationRange; 414 SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth) 415 << SemaRef.getLangOptions().InstantiationDepth; 416 return true; 417 } 418 419 /// \brief Prints the current instantiation stack through a series of 420 /// notes. 421 void Sema::PrintInstantiationStack() { 422 // Determine which template instantiations to skip, if any. 423 unsigned SkipStart = ActiveTemplateInstantiations.size(), SkipEnd = SkipStart; 424 unsigned Limit = Diags.getTemplateBacktraceLimit(); 425 if (Limit && Limit < ActiveTemplateInstantiations.size()) { 426 SkipStart = Limit / 2 + Limit % 2; 427 SkipEnd = ActiveTemplateInstantiations.size() - Limit / 2; 428 } 429 430 // FIXME: In all of these cases, we need to show the template arguments 431 unsigned InstantiationIdx = 0; 432 for (SmallVector<ActiveTemplateInstantiation, 16>::reverse_iterator 433 Active = ActiveTemplateInstantiations.rbegin(), 434 ActiveEnd = ActiveTemplateInstantiations.rend(); 435 Active != ActiveEnd; 436 ++Active, ++InstantiationIdx) { 437 // Skip this instantiation? 438 if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) { 439 if (InstantiationIdx == SkipStart) { 440 // Note that we're skipping instantiations. 441 Diags.Report(Active->PointOfInstantiation, 442 diag::note_instantiation_contexts_suppressed) 443 << unsigned(ActiveTemplateInstantiations.size() - Limit); 444 } 445 continue; 446 } 447 448 switch (Active->Kind) { 449 case ActiveTemplateInstantiation::TemplateInstantiation: { 450 Decl *D = reinterpret_cast<Decl *>(Active->Entity); 451 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 452 unsigned DiagID = diag::note_template_member_class_here; 453 if (isa<ClassTemplateSpecializationDecl>(Record)) 454 DiagID = diag::note_template_class_instantiation_here; 455 Diags.Report(Active->PointOfInstantiation, DiagID) 456 << Context.getTypeDeclType(Record) 457 << Active->InstantiationRange; 458 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 459 unsigned DiagID; 460 if (Function->getPrimaryTemplate()) 461 DiagID = diag::note_function_template_spec_here; 462 else 463 DiagID = diag::note_template_member_function_here; 464 Diags.Report(Active->PointOfInstantiation, DiagID) 465 << Function 466 << Active->InstantiationRange; 467 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { 468 Diags.Report(Active->PointOfInstantiation, 469 diag::note_template_static_data_member_def_here) 470 << VD 471 << Active->InstantiationRange; 472 } else { 473 Diags.Report(Active->PointOfInstantiation, 474 diag::note_template_type_alias_instantiation_here) 475 << cast<TypeAliasTemplateDecl>(D) 476 << Active->InstantiationRange; 477 } 478 break; 479 } 480 481 case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation: { 482 TemplateDecl *Template = cast<TemplateDecl>((Decl *)Active->Entity); 483 std::string TemplateArgsStr 484 = TemplateSpecializationType::PrintTemplateArgumentList( 485 Active->TemplateArgs, 486 Active->NumTemplateArgs, 487 getPrintingPolicy()); 488 Diags.Report(Active->PointOfInstantiation, 489 diag::note_default_arg_instantiation_here) 490 << (Template->getNameAsString() + TemplateArgsStr) 491 << Active->InstantiationRange; 492 break; 493 } 494 495 case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution: { 496 FunctionTemplateDecl *FnTmpl 497 = cast<FunctionTemplateDecl>((Decl *)Active->Entity); 498 Diags.Report(Active->PointOfInstantiation, 499 diag::note_explicit_template_arg_substitution_here) 500 << FnTmpl 501 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(), 502 Active->TemplateArgs, 503 Active->NumTemplateArgs) 504 << Active->InstantiationRange; 505 break; 506 } 507 508 case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution: 509 if (ClassTemplatePartialSpecializationDecl *PartialSpec 510 = dyn_cast<ClassTemplatePartialSpecializationDecl>( 511 (Decl *)Active->Entity)) { 512 Diags.Report(Active->PointOfInstantiation, 513 diag::note_partial_spec_deduct_instantiation_here) 514 << Context.getTypeDeclType(PartialSpec) 515 << getTemplateArgumentBindingsText( 516 PartialSpec->getTemplateParameters(), 517 Active->TemplateArgs, 518 Active->NumTemplateArgs) 519 << Active->InstantiationRange; 520 } else { 521 FunctionTemplateDecl *FnTmpl 522 = cast<FunctionTemplateDecl>((Decl *)Active->Entity); 523 Diags.Report(Active->PointOfInstantiation, 524 diag::note_function_template_deduction_instantiation_here) 525 << FnTmpl 526 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(), 527 Active->TemplateArgs, 528 Active->NumTemplateArgs) 529 << Active->InstantiationRange; 530 } 531 break; 532 533 case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation: { 534 ParmVarDecl *Param = cast<ParmVarDecl>((Decl *)Active->Entity); 535 FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext()); 536 537 std::string TemplateArgsStr 538 = TemplateSpecializationType::PrintTemplateArgumentList( 539 Active->TemplateArgs, 540 Active->NumTemplateArgs, 541 getPrintingPolicy()); 542 Diags.Report(Active->PointOfInstantiation, 543 diag::note_default_function_arg_instantiation_here) 544 << (FD->getNameAsString() + TemplateArgsStr) 545 << Active->InstantiationRange; 546 break; 547 } 548 549 case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution: { 550 NamedDecl *Parm = cast<NamedDecl>((Decl *)Active->Entity); 551 std::string Name; 552 if (!Parm->getName().empty()) 553 Name = std::string(" '") + Parm->getName().str() + "'"; 554 555 TemplateParameterList *TemplateParams = 0; 556 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template)) 557 TemplateParams = Template->getTemplateParameters(); 558 else 559 TemplateParams = 560 cast<ClassTemplatePartialSpecializationDecl>(Active->Template) 561 ->getTemplateParameters(); 562 Diags.Report(Active->PointOfInstantiation, 563 diag::note_prior_template_arg_substitution) 564 << isa<TemplateTemplateParmDecl>(Parm) 565 << Name 566 << getTemplateArgumentBindingsText(TemplateParams, 567 Active->TemplateArgs, 568 Active->NumTemplateArgs) 569 << Active->InstantiationRange; 570 break; 571 } 572 573 case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking: { 574 TemplateParameterList *TemplateParams = 0; 575 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template)) 576 TemplateParams = Template->getTemplateParameters(); 577 else 578 TemplateParams = 579 cast<ClassTemplatePartialSpecializationDecl>(Active->Template) 580 ->getTemplateParameters(); 581 582 Diags.Report(Active->PointOfInstantiation, 583 diag::note_template_default_arg_checking) 584 << getTemplateArgumentBindingsText(TemplateParams, 585 Active->TemplateArgs, 586 Active->NumTemplateArgs) 587 << Active->InstantiationRange; 588 break; 589 } 590 } 591 } 592 } 593 594 llvm::Optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const { 595 if (InNonInstantiationSFINAEContext) 596 return llvm::Optional<TemplateDeductionInfo *>(0); 597 598 for (SmallVector<ActiveTemplateInstantiation, 16>::const_reverse_iterator 599 Active = ActiveTemplateInstantiations.rbegin(), 600 ActiveEnd = ActiveTemplateInstantiations.rend(); 601 Active != ActiveEnd; 602 ++Active) 603 { 604 switch(Active->Kind) { 605 case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation: 606 case ActiveTemplateInstantiation::TemplateInstantiation: 607 // This is a template instantiation, so there is no SFINAE. 608 return llvm::Optional<TemplateDeductionInfo *>(); 609 610 case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation: 611 case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution: 612 case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking: 613 // A default template argument instantiation and substitution into 614 // template parameters with arguments for prior parameters may or may 615 // not be a SFINAE context; look further up the stack. 616 break; 617 618 case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution: 619 case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution: 620 // We're either substitution explicitly-specified template arguments 621 // or deduced template arguments, so SFINAE applies. 622 assert(Active->DeductionInfo && "Missing deduction info pointer"); 623 return Active->DeductionInfo; 624 } 625 } 626 627 return llvm::Optional<TemplateDeductionInfo *>(); 628 } 629 630 /// \brief Retrieve the depth and index of a parameter pack. 631 static std::pair<unsigned, unsigned> 632 getDepthAndIndex(NamedDecl *ND) { 633 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) 634 return std::make_pair(TTP->getDepth(), TTP->getIndex()); 635 636 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND)) 637 return std::make_pair(NTTP->getDepth(), NTTP->getIndex()); 638 639 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); 640 return std::make_pair(TTP->getDepth(), TTP->getIndex()); 641 } 642 643 //===----------------------------------------------------------------------===/ 644 // Template Instantiation for Types 645 //===----------------------------------------------------------------------===/ 646 namespace { 647 class TemplateInstantiator : public TreeTransform<TemplateInstantiator> { 648 const MultiLevelTemplateArgumentList &TemplateArgs; 649 SourceLocation Loc; 650 DeclarationName Entity; 651 652 public: 653 typedef TreeTransform<TemplateInstantiator> inherited; 654 655 TemplateInstantiator(Sema &SemaRef, 656 const MultiLevelTemplateArgumentList &TemplateArgs, 657 SourceLocation Loc, 658 DeclarationName Entity) 659 : inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc), 660 Entity(Entity) { } 661 662 /// \brief Determine whether the given type \p T has already been 663 /// transformed. 664 /// 665 /// For the purposes of template instantiation, a type has already been 666 /// transformed if it is NULL or if it is not dependent. 667 bool AlreadyTransformed(QualType T); 668 669 /// \brief Returns the location of the entity being instantiated, if known. 670 SourceLocation getBaseLocation() { return Loc; } 671 672 /// \brief Returns the name of the entity being instantiated, if any. 673 DeclarationName getBaseEntity() { return Entity; } 674 675 /// \brief Sets the "base" location and entity when that 676 /// information is known based on another transformation. 677 void setBase(SourceLocation Loc, DeclarationName Entity) { 678 this->Loc = Loc; 679 this->Entity = Entity; 680 } 681 682 bool TryExpandParameterPacks(SourceLocation EllipsisLoc, 683 SourceRange PatternRange, 684 llvm::ArrayRef<UnexpandedParameterPack> Unexpanded, 685 bool &ShouldExpand, 686 bool &RetainExpansion, 687 llvm::Optional<unsigned> &NumExpansions) { 688 return getSema().CheckParameterPacksForExpansion(EllipsisLoc, 689 PatternRange, Unexpanded, 690 TemplateArgs, 691 ShouldExpand, 692 RetainExpansion, 693 NumExpansions); 694 } 695 696 void ExpandingFunctionParameterPack(ParmVarDecl *Pack) { 697 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack); 698 } 699 700 TemplateArgument ForgetPartiallySubstitutedPack() { 701 TemplateArgument Result; 702 if (NamedDecl *PartialPack 703 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){ 704 MultiLevelTemplateArgumentList &TemplateArgs 705 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs); 706 unsigned Depth, Index; 707 llvm::tie(Depth, Index) = getDepthAndIndex(PartialPack); 708 if (TemplateArgs.hasTemplateArgument(Depth, Index)) { 709 Result = TemplateArgs(Depth, Index); 710 TemplateArgs.setArgument(Depth, Index, TemplateArgument()); 711 } 712 } 713 714 return Result; 715 } 716 717 void RememberPartiallySubstitutedPack(TemplateArgument Arg) { 718 if (Arg.isNull()) 719 return; 720 721 if (NamedDecl *PartialPack 722 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){ 723 MultiLevelTemplateArgumentList &TemplateArgs 724 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs); 725 unsigned Depth, Index; 726 llvm::tie(Depth, Index) = getDepthAndIndex(PartialPack); 727 TemplateArgs.setArgument(Depth, Index, Arg); 728 } 729 } 730 731 /// \brief Transform the given declaration by instantiating a reference to 732 /// this declaration. 733 Decl *TransformDecl(SourceLocation Loc, Decl *D); 734 735 /// \brief Transform the definition of the given declaration by 736 /// instantiating it. 737 Decl *TransformDefinition(SourceLocation Loc, Decl *D); 738 739 /// \bried Transform the first qualifier within a scope by instantiating the 740 /// declaration. 741 NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc); 742 743 /// \brief Rebuild the exception declaration and register the declaration 744 /// as an instantiated local. 745 VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl, 746 TypeSourceInfo *Declarator, 747 SourceLocation StartLoc, 748 SourceLocation NameLoc, 749 IdentifierInfo *Name); 750 751 /// \brief Rebuild the Objective-C exception declaration and register the 752 /// declaration as an instantiated local. 753 VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl, 754 TypeSourceInfo *TSInfo, QualType T); 755 756 /// \brief Check for tag mismatches when instantiating an 757 /// elaborated type. 758 QualType RebuildElaboratedType(SourceLocation KeywordLoc, 759 ElaboratedTypeKeyword Keyword, 760 NestedNameSpecifierLoc QualifierLoc, 761 QualType T); 762 763 TemplateName TransformTemplateName(CXXScopeSpec &SS, 764 TemplateName Name, 765 SourceLocation NameLoc, 766 QualType ObjectType = QualType(), 767 NamedDecl *FirstQualifierInScope = 0); 768 769 ExprResult TransformPredefinedExpr(PredefinedExpr *E); 770 ExprResult TransformDeclRefExpr(DeclRefExpr *E); 771 ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E); 772 ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E, 773 NonTypeTemplateParmDecl *D); 774 ExprResult TransformSubstNonTypeTemplateParmPackExpr( 775 SubstNonTypeTemplateParmPackExpr *E); 776 777 QualType TransformFunctionProtoType(TypeLocBuilder &TLB, 778 FunctionProtoTypeLoc TL); 779 ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm, 780 int indexAdjustment, 781 llvm::Optional<unsigned> NumExpansions); 782 783 /// \brief Transforms a template type parameter type by performing 784 /// substitution of the corresponding template type argument. 785 QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB, 786 TemplateTypeParmTypeLoc TL); 787 788 /// \brief Transforms an already-substituted template type parameter pack 789 /// into either itself (if we aren't substituting into its pack expansion) 790 /// or the appropriate substituted argument. 791 QualType TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB, 792 SubstTemplateTypeParmPackTypeLoc TL); 793 794 ExprResult TransformCallExpr(CallExpr *CE) { 795 getSema().CallsUndergoingInstantiation.push_back(CE); 796 ExprResult Result = 797 TreeTransform<TemplateInstantiator>::TransformCallExpr(CE); 798 getSema().CallsUndergoingInstantiation.pop_back(); 799 return move(Result); 800 } 801 802 private: 803 ExprResult transformNonTypeTemplateParmRef(NonTypeTemplateParmDecl *parm, 804 SourceLocation loc, 805 const TemplateArgument &arg); 806 }; 807 } 808 809 bool TemplateInstantiator::AlreadyTransformed(QualType T) { 810 if (T.isNull()) 811 return true; 812 813 if (T->isInstantiationDependentType() || T->isVariablyModifiedType()) 814 return false; 815 816 getSema().MarkDeclarationsReferencedInType(Loc, T); 817 return true; 818 } 819 820 Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) { 821 if (!D) 822 return 0; 823 824 if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) { 825 if (TTP->getDepth() < TemplateArgs.getNumLevels()) { 826 // If the corresponding template argument is NULL or non-existent, it's 827 // because we are performing instantiation from explicitly-specified 828 // template arguments in a function template, but there were some 829 // arguments left unspecified. 830 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(), 831 TTP->getPosition())) 832 return D; 833 834 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition()); 835 836 if (TTP->isParameterPack()) { 837 assert(Arg.getKind() == TemplateArgument::Pack && 838 "Missing argument pack"); 839 840 assert(getSema().ArgumentPackSubstitutionIndex >= 0); 841 assert(getSema().ArgumentPackSubstitutionIndex < (int)Arg.pack_size()); 842 Arg = Arg.pack_begin()[getSema().ArgumentPackSubstitutionIndex]; 843 } 844 845 TemplateName Template = Arg.getAsTemplate(); 846 assert(!Template.isNull() && Template.getAsTemplateDecl() && 847 "Wrong kind of template template argument"); 848 return Template.getAsTemplateDecl(); 849 } 850 851 // Fall through to find the instantiated declaration for this template 852 // template parameter. 853 } 854 855 return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs); 856 } 857 858 Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) { 859 Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs); 860 if (!Inst) 861 return 0; 862 863 getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst); 864 return Inst; 865 } 866 867 NamedDecl * 868 TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D, 869 SourceLocation Loc) { 870 // If the first part of the nested-name-specifier was a template type 871 // parameter, instantiate that type parameter down to a tag type. 872 if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) { 873 const TemplateTypeParmType *TTP 874 = cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD)); 875 876 if (TTP->getDepth() < TemplateArgs.getNumLevels()) { 877 // FIXME: This needs testing w/ member access expressions. 878 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex()); 879 880 if (TTP->isParameterPack()) { 881 assert(Arg.getKind() == TemplateArgument::Pack && 882 "Missing argument pack"); 883 884 if (getSema().ArgumentPackSubstitutionIndex == -1) 885 return 0; 886 887 assert(getSema().ArgumentPackSubstitutionIndex < (int)Arg.pack_size()); 888 Arg = Arg.pack_begin()[getSema().ArgumentPackSubstitutionIndex]; 889 } 890 891 QualType T = Arg.getAsType(); 892 if (T.isNull()) 893 return cast_or_null<NamedDecl>(TransformDecl(Loc, D)); 894 895 if (const TagType *Tag = T->getAs<TagType>()) 896 return Tag->getDecl(); 897 898 // The resulting type is not a tag; complain. 899 getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T; 900 return 0; 901 } 902 } 903 904 return cast_or_null<NamedDecl>(TransformDecl(Loc, D)); 905 } 906 907 VarDecl * 908 TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl, 909 TypeSourceInfo *Declarator, 910 SourceLocation StartLoc, 911 SourceLocation NameLoc, 912 IdentifierInfo *Name) { 913 VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator, 914 StartLoc, NameLoc, Name); 915 if (Var) 916 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var); 917 return Var; 918 } 919 920 VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl, 921 TypeSourceInfo *TSInfo, 922 QualType T) { 923 VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T); 924 if (Var) 925 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var); 926 return Var; 927 } 928 929 QualType 930 TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc, 931 ElaboratedTypeKeyword Keyword, 932 NestedNameSpecifierLoc QualifierLoc, 933 QualType T) { 934 if (const TagType *TT = T->getAs<TagType>()) { 935 TagDecl* TD = TT->getDecl(); 936 937 SourceLocation TagLocation = KeywordLoc; 938 939 // FIXME: type might be anonymous. 940 IdentifierInfo *Id = TD->getIdentifier(); 941 942 // TODO: should we even warn on struct/class mismatches for this? Seems 943 // like it's likely to produce a lot of spurious errors. 944 if (Keyword != ETK_None && Keyword != ETK_Typename) { 945 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword); 946 if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false, 947 TagLocation, *Id)) { 948 SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag) 949 << Id 950 << FixItHint::CreateReplacement(SourceRange(TagLocation), 951 TD->getKindName()); 952 SemaRef.Diag(TD->getLocation(), diag::note_previous_use); 953 } 954 } 955 } 956 957 return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(KeywordLoc, 958 Keyword, 959 QualifierLoc, 960 T); 961 } 962 963 TemplateName TemplateInstantiator::TransformTemplateName(CXXScopeSpec &SS, 964 TemplateName Name, 965 SourceLocation NameLoc, 966 QualType ObjectType, 967 NamedDecl *FirstQualifierInScope) { 968 if (TemplateTemplateParmDecl *TTP 969 = dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) { 970 if (TTP->getDepth() < TemplateArgs.getNumLevels()) { 971 // If the corresponding template argument is NULL or non-existent, it's 972 // because we are performing instantiation from explicitly-specified 973 // template arguments in a function template, but there were some 974 // arguments left unspecified. 975 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(), 976 TTP->getPosition())) 977 return Name; 978 979 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition()); 980 981 if (TTP->isParameterPack()) { 982 assert(Arg.getKind() == TemplateArgument::Pack && 983 "Missing argument pack"); 984 985 if (getSema().ArgumentPackSubstitutionIndex == -1) { 986 // We have the template argument pack to substitute, but we're not 987 // actually expanding the enclosing pack expansion yet. So, just 988 // keep the entire argument pack. 989 return getSema().Context.getSubstTemplateTemplateParmPack(TTP, Arg); 990 } 991 992 assert(getSema().ArgumentPackSubstitutionIndex < (int)Arg.pack_size()); 993 Arg = Arg.pack_begin()[getSema().ArgumentPackSubstitutionIndex]; 994 } 995 996 TemplateName Template = Arg.getAsTemplate(); 997 assert(!Template.isNull() && "Null template template argument"); 998 999 // We don't ever want to substitute for a qualified template name, since 1000 // the qualifier is handled separately. So, look through the qualified 1001 // template name to its underlying declaration. 1002 if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 1003 Template = TemplateName(QTN->getTemplateDecl()); 1004 1005 Template = getSema().Context.getSubstTemplateTemplateParm(TTP, Template); 1006 return Template; 1007 } 1008 } 1009 1010 if (SubstTemplateTemplateParmPackStorage *SubstPack 1011 = Name.getAsSubstTemplateTemplateParmPack()) { 1012 if (getSema().ArgumentPackSubstitutionIndex == -1) 1013 return Name; 1014 1015 const TemplateArgument &ArgPack = SubstPack->getArgumentPack(); 1016 assert(getSema().ArgumentPackSubstitutionIndex < (int)ArgPack.pack_size() && 1017 "Pack substitution index out-of-range"); 1018 return ArgPack.pack_begin()[getSema().ArgumentPackSubstitutionIndex] 1019 .getAsTemplate(); 1020 } 1021 1022 return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType, 1023 FirstQualifierInScope); 1024 } 1025 1026 ExprResult 1027 TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) { 1028 if (!E->isTypeDependent()) 1029 return SemaRef.Owned(E); 1030 1031 FunctionDecl *currentDecl = getSema().getCurFunctionDecl(); 1032 assert(currentDecl && "Must have current function declaration when " 1033 "instantiating."); 1034 1035 PredefinedExpr::IdentType IT = E->getIdentType(); 1036 1037 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length(); 1038 1039 llvm::APInt LengthI(32, Length + 1); 1040 QualType ResTy = getSema().Context.CharTy.withConst(); 1041 ResTy = getSema().Context.getConstantArrayType(ResTy, LengthI, 1042 ArrayType::Normal, 0); 1043 PredefinedExpr *PE = 1044 new (getSema().Context) PredefinedExpr(E->getLocation(), ResTy, IT); 1045 return getSema().Owned(PE); 1046 } 1047 1048 ExprResult 1049 TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E, 1050 NonTypeTemplateParmDecl *NTTP) { 1051 // If the corresponding template argument is NULL or non-existent, it's 1052 // because we are performing instantiation from explicitly-specified 1053 // template arguments in a function template, but there were some 1054 // arguments left unspecified. 1055 if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(), 1056 NTTP->getPosition())) 1057 return SemaRef.Owned(E); 1058 1059 TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition()); 1060 if (NTTP->isParameterPack()) { 1061 assert(Arg.getKind() == TemplateArgument::Pack && 1062 "Missing argument pack"); 1063 1064 if (getSema().ArgumentPackSubstitutionIndex == -1) { 1065 // We have an argument pack, but we can't select a particular argument 1066 // out of it yet. Therefore, we'll build an expression to hold on to that 1067 // argument pack. 1068 QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs, 1069 E->getLocation(), 1070 NTTP->getDeclName()); 1071 if (TargetType.isNull()) 1072 return ExprError(); 1073 1074 return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(TargetType, 1075 NTTP, 1076 E->getLocation(), 1077 Arg); 1078 } 1079 1080 assert(getSema().ArgumentPackSubstitutionIndex < (int)Arg.pack_size()); 1081 Arg = Arg.pack_begin()[getSema().ArgumentPackSubstitutionIndex]; 1082 } 1083 1084 return transformNonTypeTemplateParmRef(NTTP, E->getLocation(), Arg); 1085 } 1086 1087 ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef( 1088 NonTypeTemplateParmDecl *parm, 1089 SourceLocation loc, 1090 const TemplateArgument &arg) { 1091 ExprResult result; 1092 QualType type; 1093 1094 // The template argument itself might be an expression, in which 1095 // case we just return that expression. 1096 if (arg.getKind() == TemplateArgument::Expression) { 1097 Expr *argExpr = arg.getAsExpr(); 1098 result = SemaRef.Owned(argExpr); 1099 type = argExpr->getType(); 1100 1101 } else if (arg.getKind() == TemplateArgument::Declaration) { 1102 ValueDecl *VD = cast<ValueDecl>(arg.getAsDecl()); 1103 1104 // Find the instantiation of the template argument. This is 1105 // required for nested templates. 1106 VD = cast_or_null<ValueDecl>( 1107 getSema().FindInstantiatedDecl(loc, VD, TemplateArgs)); 1108 if (!VD) 1109 return ExprError(); 1110 1111 // Derive the type we want the substituted decl to have. This had 1112 // better be non-dependent, or these checks will have serious problems. 1113 if (parm->isExpandedParameterPack()) { 1114 type = parm->getExpansionType(SemaRef.ArgumentPackSubstitutionIndex); 1115 } else if (parm->isParameterPack() && 1116 isa<PackExpansionType>(parm->getType())) { 1117 type = SemaRef.SubstType( 1118 cast<PackExpansionType>(parm->getType())->getPattern(), 1119 TemplateArgs, loc, parm->getDeclName()); 1120 } else { 1121 type = SemaRef.SubstType(parm->getType(), TemplateArgs, 1122 loc, parm->getDeclName()); 1123 } 1124 assert(!type.isNull() && "type substitution failed for param type"); 1125 assert(!type->isDependentType() && "param type still dependent"); 1126 result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, type, loc); 1127 1128 if (!result.isInvalid()) type = result.get()->getType(); 1129 } else { 1130 result = SemaRef.BuildExpressionFromIntegralTemplateArgument(arg, loc); 1131 1132 // Note that this type can be different from the type of 'result', 1133 // e.g. if it's an enum type. 1134 type = arg.getIntegralType(); 1135 } 1136 if (result.isInvalid()) return ExprError(); 1137 1138 Expr *resultExpr = result.take(); 1139 return SemaRef.Owned(new (SemaRef.Context) 1140 SubstNonTypeTemplateParmExpr(type, 1141 resultExpr->getValueKind(), 1142 loc, parm, resultExpr)); 1143 } 1144 1145 ExprResult 1146 TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr( 1147 SubstNonTypeTemplateParmPackExpr *E) { 1148 if (getSema().ArgumentPackSubstitutionIndex == -1) { 1149 // We aren't expanding the parameter pack, so just return ourselves. 1150 return getSema().Owned(E); 1151 } 1152 1153 const TemplateArgument &ArgPack = E->getArgumentPack(); 1154 unsigned Index = (unsigned)getSema().ArgumentPackSubstitutionIndex; 1155 assert(Index < ArgPack.pack_size() && "Substitution index out-of-range"); 1156 1157 const TemplateArgument &Arg = ArgPack.pack_begin()[Index]; 1158 return transformNonTypeTemplateParmRef(E->getParameterPack(), 1159 E->getParameterPackLocation(), 1160 Arg); 1161 } 1162 1163 ExprResult 1164 TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) { 1165 NamedDecl *D = E->getDecl(); 1166 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) { 1167 if (NTTP->getDepth() < TemplateArgs.getNumLevels()) 1168 return TransformTemplateParmRefExpr(E, NTTP); 1169 1170 // We have a non-type template parameter that isn't fully substituted; 1171 // FindInstantiatedDecl will find it in the local instantiation scope. 1172 } 1173 1174 return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E); 1175 } 1176 1177 ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr( 1178 CXXDefaultArgExpr *E) { 1179 assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())-> 1180 getDescribedFunctionTemplate() && 1181 "Default arg expressions are never formed in dependent cases."); 1182 return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(), 1183 cast<FunctionDecl>(E->getParam()->getDeclContext()), 1184 E->getParam()); 1185 } 1186 1187 QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB, 1188 FunctionProtoTypeLoc TL) { 1189 // We need a local instantiation scope for this function prototype. 1190 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true); 1191 return inherited::TransformFunctionProtoType(TLB, TL); 1192 } 1193 1194 ParmVarDecl * 1195 TemplateInstantiator::TransformFunctionTypeParam(ParmVarDecl *OldParm, 1196 int indexAdjustment, 1197 llvm::Optional<unsigned> NumExpansions) { 1198 return SemaRef.SubstParmVarDecl(OldParm, TemplateArgs, indexAdjustment, 1199 NumExpansions); 1200 } 1201 1202 QualType 1203 TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB, 1204 TemplateTypeParmTypeLoc TL) { 1205 const TemplateTypeParmType *T = TL.getTypePtr(); 1206 if (T->getDepth() < TemplateArgs.getNumLevels()) { 1207 // Replace the template type parameter with its corresponding 1208 // template argument. 1209 1210 // If the corresponding template argument is NULL or doesn't exist, it's 1211 // because we are performing instantiation from explicitly-specified 1212 // template arguments in a function template class, but there were some 1213 // arguments left unspecified. 1214 if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) { 1215 TemplateTypeParmTypeLoc NewTL 1216 = TLB.push<TemplateTypeParmTypeLoc>(TL.getType()); 1217 NewTL.setNameLoc(TL.getNameLoc()); 1218 return TL.getType(); 1219 } 1220 1221 TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex()); 1222 1223 if (T->isParameterPack()) { 1224 assert(Arg.getKind() == TemplateArgument::Pack && 1225 "Missing argument pack"); 1226 1227 if (getSema().ArgumentPackSubstitutionIndex == -1) { 1228 // We have the template argument pack, but we're not expanding the 1229 // enclosing pack expansion yet. Just save the template argument 1230 // pack for later substitution. 1231 QualType Result 1232 = getSema().Context.getSubstTemplateTypeParmPackType(T, Arg); 1233 SubstTemplateTypeParmPackTypeLoc NewTL 1234 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result); 1235 NewTL.setNameLoc(TL.getNameLoc()); 1236 return Result; 1237 } 1238 1239 assert(getSema().ArgumentPackSubstitutionIndex < (int)Arg.pack_size()); 1240 Arg = Arg.pack_begin()[getSema().ArgumentPackSubstitutionIndex]; 1241 } 1242 1243 assert(Arg.getKind() == TemplateArgument::Type && 1244 "Template argument kind mismatch"); 1245 1246 QualType Replacement = Arg.getAsType(); 1247 1248 // TODO: only do this uniquing once, at the start of instantiation. 1249 QualType Result 1250 = getSema().Context.getSubstTemplateTypeParmType(T, Replacement); 1251 SubstTemplateTypeParmTypeLoc NewTL 1252 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result); 1253 NewTL.setNameLoc(TL.getNameLoc()); 1254 return Result; 1255 } 1256 1257 // The template type parameter comes from an inner template (e.g., 1258 // the template parameter list of a member template inside the 1259 // template we are instantiating). Create a new template type 1260 // parameter with the template "level" reduced by one. 1261 TemplateTypeParmDecl *NewTTPDecl = 0; 1262 if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl()) 1263 NewTTPDecl = cast_or_null<TemplateTypeParmDecl>( 1264 TransformDecl(TL.getNameLoc(), OldTTPDecl)); 1265 1266 QualType Result 1267 = getSema().Context.getTemplateTypeParmType(T->getDepth() 1268 - TemplateArgs.getNumLevels(), 1269 T->getIndex(), 1270 T->isParameterPack(), 1271 NewTTPDecl); 1272 TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); 1273 NewTL.setNameLoc(TL.getNameLoc()); 1274 return Result; 1275 } 1276 1277 QualType 1278 TemplateInstantiator::TransformSubstTemplateTypeParmPackType( 1279 TypeLocBuilder &TLB, 1280 SubstTemplateTypeParmPackTypeLoc TL) { 1281 if (getSema().ArgumentPackSubstitutionIndex == -1) { 1282 // We aren't expanding the parameter pack, so just return ourselves. 1283 SubstTemplateTypeParmPackTypeLoc NewTL 1284 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(TL.getType()); 1285 NewTL.setNameLoc(TL.getNameLoc()); 1286 return TL.getType(); 1287 } 1288 1289 const TemplateArgument &ArgPack = TL.getTypePtr()->getArgumentPack(); 1290 unsigned Index = (unsigned)getSema().ArgumentPackSubstitutionIndex; 1291 assert(Index < ArgPack.pack_size() && "Substitution index out-of-range"); 1292 1293 QualType Result = ArgPack.pack_begin()[Index].getAsType(); 1294 Result = getSema().Context.getSubstTemplateTypeParmType( 1295 TL.getTypePtr()->getReplacedParameter(), 1296 Result); 1297 SubstTemplateTypeParmTypeLoc NewTL 1298 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result); 1299 NewTL.setNameLoc(TL.getNameLoc()); 1300 return Result; 1301 } 1302 1303 /// \brief Perform substitution on the type T with a given set of template 1304 /// arguments. 1305 /// 1306 /// This routine substitutes the given template arguments into the 1307 /// type T and produces the instantiated type. 1308 /// 1309 /// \param T the type into which the template arguments will be 1310 /// substituted. If this type is not dependent, it will be returned 1311 /// immediately. 1312 /// 1313 /// \param TemplateArgs the template arguments that will be 1314 /// substituted for the top-level template parameters within T. 1315 /// 1316 /// \param Loc the location in the source code where this substitution 1317 /// is being performed. It will typically be the location of the 1318 /// declarator (if we're instantiating the type of some declaration) 1319 /// or the location of the type in the source code (if, e.g., we're 1320 /// instantiating the type of a cast expression). 1321 /// 1322 /// \param Entity the name of the entity associated with a declaration 1323 /// being instantiated (if any). May be empty to indicate that there 1324 /// is no such entity (if, e.g., this is a type that occurs as part of 1325 /// a cast expression) or that the entity has no name (e.g., an 1326 /// unnamed function parameter). 1327 /// 1328 /// \returns If the instantiation succeeds, the instantiated 1329 /// type. Otherwise, produces diagnostics and returns a NULL type. 1330 TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T, 1331 const MultiLevelTemplateArgumentList &Args, 1332 SourceLocation Loc, 1333 DeclarationName Entity) { 1334 assert(!ActiveTemplateInstantiations.empty() && 1335 "Cannot perform an instantiation without some context on the " 1336 "instantiation stack"); 1337 1338 if (!T->getType()->isInstantiationDependentType() && 1339 !T->getType()->isVariablyModifiedType()) 1340 return T; 1341 1342 TemplateInstantiator Instantiator(*this, Args, Loc, Entity); 1343 return Instantiator.TransformType(T); 1344 } 1345 1346 TypeSourceInfo *Sema::SubstType(TypeLoc TL, 1347 const MultiLevelTemplateArgumentList &Args, 1348 SourceLocation Loc, 1349 DeclarationName Entity) { 1350 assert(!ActiveTemplateInstantiations.empty() && 1351 "Cannot perform an instantiation without some context on the " 1352 "instantiation stack"); 1353 1354 if (TL.getType().isNull()) 1355 return 0; 1356 1357 if (!TL.getType()->isInstantiationDependentType() && 1358 !TL.getType()->isVariablyModifiedType()) { 1359 // FIXME: Make a copy of the TypeLoc data here, so that we can 1360 // return a new TypeSourceInfo. Inefficient! 1361 TypeLocBuilder TLB; 1362 TLB.pushFullCopy(TL); 1363 return TLB.getTypeSourceInfo(Context, TL.getType()); 1364 } 1365 1366 TemplateInstantiator Instantiator(*this, Args, Loc, Entity); 1367 TypeLocBuilder TLB; 1368 TLB.reserve(TL.getFullDataSize()); 1369 QualType Result = Instantiator.TransformType(TLB, TL); 1370 if (Result.isNull()) 1371 return 0; 1372 1373 return TLB.getTypeSourceInfo(Context, Result); 1374 } 1375 1376 /// Deprecated form of the above. 1377 QualType Sema::SubstType(QualType T, 1378 const MultiLevelTemplateArgumentList &TemplateArgs, 1379 SourceLocation Loc, DeclarationName Entity) { 1380 assert(!ActiveTemplateInstantiations.empty() && 1381 "Cannot perform an instantiation without some context on the " 1382 "instantiation stack"); 1383 1384 // If T is not a dependent type or a variably-modified type, there 1385 // is nothing to do. 1386 if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType()) 1387 return T; 1388 1389 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity); 1390 return Instantiator.TransformType(T); 1391 } 1392 1393 static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) { 1394 if (T->getType()->isInstantiationDependentType() || 1395 T->getType()->isVariablyModifiedType()) 1396 return true; 1397 1398 TypeLoc TL = T->getTypeLoc().IgnoreParens(); 1399 if (!isa<FunctionProtoTypeLoc>(TL)) 1400 return false; 1401 1402 FunctionProtoTypeLoc FP = cast<FunctionProtoTypeLoc>(TL); 1403 for (unsigned I = 0, E = FP.getNumArgs(); I != E; ++I) { 1404 ParmVarDecl *P = FP.getArg(I); 1405 1406 // The parameter's type as written might be dependent even if the 1407 // decayed type was not dependent. 1408 if (TypeSourceInfo *TSInfo = P->getTypeSourceInfo()) 1409 if (TSInfo->getType()->isInstantiationDependentType()) 1410 return true; 1411 1412 // TODO: currently we always rebuild expressions. When we 1413 // properly get lazier about this, we should use the same 1414 // logic to avoid rebuilding prototypes here. 1415 if (P->hasDefaultArg()) 1416 return true; 1417 } 1418 1419 return false; 1420 } 1421 1422 /// A form of SubstType intended specifically for instantiating the 1423 /// type of a FunctionDecl. Its purpose is solely to force the 1424 /// instantiation of default-argument expressions. 1425 TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T, 1426 const MultiLevelTemplateArgumentList &Args, 1427 SourceLocation Loc, 1428 DeclarationName Entity) { 1429 assert(!ActiveTemplateInstantiations.empty() && 1430 "Cannot perform an instantiation without some context on the " 1431 "instantiation stack"); 1432 1433 if (!NeedsInstantiationAsFunctionType(T)) 1434 return T; 1435 1436 TemplateInstantiator Instantiator(*this, Args, Loc, Entity); 1437 1438 TypeLocBuilder TLB; 1439 1440 TypeLoc TL = T->getTypeLoc(); 1441 TLB.reserve(TL.getFullDataSize()); 1442 1443 QualType Result = Instantiator.TransformType(TLB, TL); 1444 if (Result.isNull()) 1445 return 0; 1446 1447 return TLB.getTypeSourceInfo(Context, Result); 1448 } 1449 1450 ParmVarDecl *Sema::SubstParmVarDecl(ParmVarDecl *OldParm, 1451 const MultiLevelTemplateArgumentList &TemplateArgs, 1452 int indexAdjustment, 1453 llvm::Optional<unsigned> NumExpansions) { 1454 TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo(); 1455 TypeSourceInfo *NewDI = 0; 1456 1457 TypeLoc OldTL = OldDI->getTypeLoc(); 1458 if (isa<PackExpansionTypeLoc>(OldTL)) { 1459 PackExpansionTypeLoc ExpansionTL = cast<PackExpansionTypeLoc>(OldTL); 1460 1461 // We have a function parameter pack. Substitute into the pattern of the 1462 // expansion. 1463 NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs, 1464 OldParm->getLocation(), OldParm->getDeclName()); 1465 if (!NewDI) 1466 return 0; 1467 1468 if (NewDI->getType()->containsUnexpandedParameterPack()) { 1469 // We still have unexpanded parameter packs, which means that 1470 // our function parameter is still a function parameter pack. 1471 // Therefore, make its type a pack expansion type. 1472 NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(), 1473 NumExpansions); 1474 } 1475 } else { 1476 NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(), 1477 OldParm->getDeclName()); 1478 } 1479 1480 if (!NewDI) 1481 return 0; 1482 1483 if (NewDI->getType()->isVoidType()) { 1484 Diag(OldParm->getLocation(), diag::err_param_with_void_type); 1485 return 0; 1486 } 1487 1488 ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(), 1489 OldParm->getInnerLocStart(), 1490 OldParm->getLocation(), 1491 OldParm->getIdentifier(), 1492 NewDI->getType(), NewDI, 1493 OldParm->getStorageClass(), 1494 OldParm->getStorageClassAsWritten()); 1495 if (!NewParm) 1496 return 0; 1497 1498 // Mark the (new) default argument as uninstantiated (if any). 1499 if (OldParm->hasUninstantiatedDefaultArg()) { 1500 Expr *Arg = OldParm->getUninstantiatedDefaultArg(); 1501 NewParm->setUninstantiatedDefaultArg(Arg); 1502 } else if (OldParm->hasUnparsedDefaultArg()) { 1503 NewParm->setUnparsedDefaultArg(); 1504 UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm); 1505 } else if (Expr *Arg = OldParm->getDefaultArg()) 1506 NewParm->setUninstantiatedDefaultArg(Arg); 1507 1508 NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg()); 1509 1510 // FIXME: When OldParm is a parameter pack and NewParm is not a parameter 1511 // pack, we actually have a set of instantiated locations. Maintain this set! 1512 if (OldParm->isParameterPack() && !NewParm->isParameterPack()) { 1513 // Add the new parameter to 1514 CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm); 1515 } else { 1516 // Introduce an Old -> New mapping 1517 CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm); 1518 } 1519 1520 // FIXME: OldParm may come from a FunctionProtoType, in which case CurContext 1521 // can be anything, is this right ? 1522 NewParm->setDeclContext(CurContext); 1523 1524 NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(), 1525 OldParm->getFunctionScopeIndex() + indexAdjustment); 1526 1527 return NewParm; 1528 } 1529 1530 /// \brief Substitute the given template arguments into the given set of 1531 /// parameters, producing the set of parameter types that would be generated 1532 /// from such a substitution. 1533 bool Sema::SubstParmTypes(SourceLocation Loc, 1534 ParmVarDecl **Params, unsigned NumParams, 1535 const MultiLevelTemplateArgumentList &TemplateArgs, 1536 SmallVectorImpl<QualType> &ParamTypes, 1537 SmallVectorImpl<ParmVarDecl *> *OutParams) { 1538 assert(!ActiveTemplateInstantiations.empty() && 1539 "Cannot perform an instantiation without some context on the " 1540 "instantiation stack"); 1541 1542 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, 1543 DeclarationName()); 1544 return Instantiator.TransformFunctionTypeParams(Loc, Params, NumParams, 0, 1545 ParamTypes, OutParams); 1546 } 1547 1548 /// \brief Perform substitution on the base class specifiers of the 1549 /// given class template specialization. 1550 /// 1551 /// Produces a diagnostic and returns true on error, returns false and 1552 /// attaches the instantiated base classes to the class template 1553 /// specialization if successful. 1554 bool 1555 Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation, 1556 CXXRecordDecl *Pattern, 1557 const MultiLevelTemplateArgumentList &TemplateArgs) { 1558 bool Invalid = false; 1559 SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases; 1560 for (ClassTemplateSpecializationDecl::base_class_iterator 1561 Base = Pattern->bases_begin(), BaseEnd = Pattern->bases_end(); 1562 Base != BaseEnd; ++Base) { 1563 if (!Base->getType()->isDependentType()) { 1564 InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(*Base)); 1565 continue; 1566 } 1567 1568 SourceLocation EllipsisLoc; 1569 TypeSourceInfo *BaseTypeLoc; 1570 if (Base->isPackExpansion()) { 1571 // This is a pack expansion. See whether we should expand it now, or 1572 // wait until later. 1573 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1574 collectUnexpandedParameterPacks(Base->getTypeSourceInfo()->getTypeLoc(), 1575 Unexpanded); 1576 bool ShouldExpand = false; 1577 bool RetainExpansion = false; 1578 llvm::Optional<unsigned> NumExpansions; 1579 if (CheckParameterPacksForExpansion(Base->getEllipsisLoc(), 1580 Base->getSourceRange(), 1581 Unexpanded, 1582 TemplateArgs, ShouldExpand, 1583 RetainExpansion, 1584 NumExpansions)) { 1585 Invalid = true; 1586 continue; 1587 } 1588 1589 // If we should expand this pack expansion now, do so. 1590 if (ShouldExpand) { 1591 for (unsigned I = 0; I != *NumExpansions; ++I) { 1592 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I); 1593 1594 TypeSourceInfo *BaseTypeLoc = SubstType(Base->getTypeSourceInfo(), 1595 TemplateArgs, 1596 Base->getSourceRange().getBegin(), 1597 DeclarationName()); 1598 if (!BaseTypeLoc) { 1599 Invalid = true; 1600 continue; 1601 } 1602 1603 if (CXXBaseSpecifier *InstantiatedBase 1604 = CheckBaseSpecifier(Instantiation, 1605 Base->getSourceRange(), 1606 Base->isVirtual(), 1607 Base->getAccessSpecifierAsWritten(), 1608 BaseTypeLoc, 1609 SourceLocation())) 1610 InstantiatedBases.push_back(InstantiatedBase); 1611 else 1612 Invalid = true; 1613 } 1614 1615 continue; 1616 } 1617 1618 // The resulting base specifier will (still) be a pack expansion. 1619 EllipsisLoc = Base->getEllipsisLoc(); 1620 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1); 1621 BaseTypeLoc = SubstType(Base->getTypeSourceInfo(), 1622 TemplateArgs, 1623 Base->getSourceRange().getBegin(), 1624 DeclarationName()); 1625 } else { 1626 BaseTypeLoc = SubstType(Base->getTypeSourceInfo(), 1627 TemplateArgs, 1628 Base->getSourceRange().getBegin(), 1629 DeclarationName()); 1630 } 1631 1632 if (!BaseTypeLoc) { 1633 Invalid = true; 1634 continue; 1635 } 1636 1637 if (CXXBaseSpecifier *InstantiatedBase 1638 = CheckBaseSpecifier(Instantiation, 1639 Base->getSourceRange(), 1640 Base->isVirtual(), 1641 Base->getAccessSpecifierAsWritten(), 1642 BaseTypeLoc, 1643 EllipsisLoc)) 1644 InstantiatedBases.push_back(InstantiatedBase); 1645 else 1646 Invalid = true; 1647 } 1648 1649 if (!Invalid && 1650 AttachBaseSpecifiers(Instantiation, InstantiatedBases.data(), 1651 InstantiatedBases.size())) 1652 Invalid = true; 1653 1654 return Invalid; 1655 } 1656 1657 /// \brief Instantiate the definition of a class from a given pattern. 1658 /// 1659 /// \param PointOfInstantiation The point of instantiation within the 1660 /// source code. 1661 /// 1662 /// \param Instantiation is the declaration whose definition is being 1663 /// instantiated. This will be either a class template specialization 1664 /// or a member class of a class template specialization. 1665 /// 1666 /// \param Pattern is the pattern from which the instantiation 1667 /// occurs. This will be either the declaration of a class template or 1668 /// the declaration of a member class of a class template. 1669 /// 1670 /// \param TemplateArgs The template arguments to be substituted into 1671 /// the pattern. 1672 /// 1673 /// \param TSK the kind of implicit or explicit instantiation to perform. 1674 /// 1675 /// \param Complain whether to complain if the class cannot be instantiated due 1676 /// to the lack of a definition. 1677 /// 1678 /// \returns true if an error occurred, false otherwise. 1679 bool 1680 Sema::InstantiateClass(SourceLocation PointOfInstantiation, 1681 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern, 1682 const MultiLevelTemplateArgumentList &TemplateArgs, 1683 TemplateSpecializationKind TSK, 1684 bool Complain) { 1685 bool Invalid = false; 1686 1687 CXXRecordDecl *PatternDef 1688 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); 1689 if (!PatternDef || PatternDef->isBeingDefined()) { 1690 if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) { 1691 // Say nothing 1692 } else if (PatternDef) { 1693 assert(PatternDef->isBeingDefined()); 1694 Diag(PointOfInstantiation, 1695 diag::err_template_instantiate_within_definition) 1696 << (TSK != TSK_ImplicitInstantiation) 1697 << Context.getTypeDeclType(Instantiation); 1698 // Not much point in noting the template declaration here, since 1699 // we're lexically inside it. 1700 Instantiation->setInvalidDecl(); 1701 } else if (Pattern == Instantiation->getInstantiatedFromMemberClass()) { 1702 Diag(PointOfInstantiation, 1703 diag::err_implicit_instantiate_member_undefined) 1704 << Context.getTypeDeclType(Instantiation); 1705 Diag(Pattern->getLocation(), diag::note_member_of_template_here); 1706 } else { 1707 Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) 1708 << (TSK != TSK_ImplicitInstantiation) 1709 << Context.getTypeDeclType(Instantiation); 1710 Diag(Pattern->getLocation(), diag::note_template_decl_here); 1711 } 1712 return true; 1713 } 1714 Pattern = PatternDef; 1715 1716 // \brief Record the point of instantiation. 1717 if (MemberSpecializationInfo *MSInfo 1718 = Instantiation->getMemberSpecializationInfo()) { 1719 MSInfo->setTemplateSpecializationKind(TSK); 1720 MSInfo->setPointOfInstantiation(PointOfInstantiation); 1721 } else if (ClassTemplateSpecializationDecl *Spec 1722 = dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) { 1723 Spec->setTemplateSpecializationKind(TSK); 1724 Spec->setPointOfInstantiation(PointOfInstantiation); 1725 } 1726 1727 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 1728 if (Inst) 1729 return true; 1730 1731 // Enter the scope of this instantiation. We don't use 1732 // PushDeclContext because we don't have a scope. 1733 ContextRAII SavedContext(*this, Instantiation); 1734 EnterExpressionEvaluationContext EvalContext(*this, 1735 Sema::PotentiallyEvaluated); 1736 1737 // If this is an instantiation of a local class, merge this local 1738 // instantiation scope with the enclosing scope. Otherwise, every 1739 // instantiation of a class has its own local instantiation scope. 1740 bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod(); 1741 LocalInstantiationScope Scope(*this, MergeWithParentScope); 1742 1743 // Pull attributes from the pattern onto the instantiation. 1744 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 1745 1746 // Start the definition of this instantiation. 1747 Instantiation->startDefinition(); 1748 1749 Instantiation->setTagKind(Pattern->getTagKind()); 1750 1751 // Do substitution on the base class specifiers. 1752 if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs)) 1753 Invalid = true; 1754 1755 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 1756 SmallVector<Decl*, 4> Fields; 1757 SmallVector<std::pair<FieldDecl*, FieldDecl*>, 4> 1758 FieldsWithMemberInitializers; 1759 for (RecordDecl::decl_iterator Member = Pattern->decls_begin(), 1760 MemberEnd = Pattern->decls_end(); 1761 Member != MemberEnd; ++Member) { 1762 // Don't instantiate members not belonging in this semantic context. 1763 // e.g. for: 1764 // @code 1765 // template <int i> class A { 1766 // class B *g; 1767 // }; 1768 // @endcode 1769 // 'class B' has the template as lexical context but semantically it is 1770 // introduced in namespace scope. 1771 if ((*Member)->getDeclContext() != Pattern) 1772 continue; 1773 1774 if ((*Member)->isInvalidDecl()) { 1775 Invalid = true; 1776 continue; 1777 } 1778 1779 Decl *NewMember = Instantiator.Visit(*Member); 1780 if (NewMember) { 1781 if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) { 1782 Fields.push_back(Field); 1783 FieldDecl *OldField = cast<FieldDecl>(*Member); 1784 if (OldField->getInClassInitializer()) 1785 FieldsWithMemberInitializers.push_back(std::make_pair(OldField, 1786 Field)); 1787 } else if (NewMember->isInvalidDecl()) 1788 Invalid = true; 1789 } else { 1790 // FIXME: Eventually, a NULL return will mean that one of the 1791 // instantiations was a semantic disaster, and we'll want to set Invalid = 1792 // true. For now, we expect to skip some members that we can't yet handle. 1793 } 1794 } 1795 1796 // Finish checking fields. 1797 ActOnFields(0, Instantiation->getLocation(), Instantiation, Fields, 1798 SourceLocation(), SourceLocation(), 0); 1799 CheckCompletedCXXClass(Instantiation); 1800 1801 // Attach any in-class member initializers now the class is complete. 1802 for (unsigned I = 0, N = FieldsWithMemberInitializers.size(); I != N; ++I) { 1803 FieldDecl *OldField = FieldsWithMemberInitializers[I].first; 1804 FieldDecl *NewField = FieldsWithMemberInitializers[I].second; 1805 Expr *OldInit = OldField->getInClassInitializer(); 1806 1807 SourceLocation LParenLoc, RParenLoc; 1808 ASTOwningVector<Expr*> NewArgs(*this); 1809 if (InstantiateInitializer(OldInit, TemplateArgs, LParenLoc, NewArgs, 1810 RParenLoc)) 1811 NewField->setInvalidDecl(); 1812 else { 1813 assert(NewArgs.size() == 1 && "wrong number of in-class initializers"); 1814 ActOnCXXInClassMemberInitializer(NewField, LParenLoc, NewArgs[0]); 1815 } 1816 } 1817 1818 if (!FieldsWithMemberInitializers.empty()) 1819 ActOnFinishDelayedMemberInitializers(Instantiation); 1820 1821 if (TSK == TSK_ImplicitInstantiation) 1822 Instantiation->setRBraceLoc(Pattern->getRBraceLoc()); 1823 1824 if (Instantiation->isInvalidDecl()) 1825 Invalid = true; 1826 else { 1827 // Instantiate any out-of-line class template partial 1828 // specializations now. 1829 for (TemplateDeclInstantiator::delayed_partial_spec_iterator 1830 P = Instantiator.delayed_partial_spec_begin(), 1831 PEnd = Instantiator.delayed_partial_spec_end(); 1832 P != PEnd; ++P) { 1833 if (!Instantiator.InstantiateClassTemplatePartialSpecialization( 1834 P->first, 1835 P->second)) { 1836 Invalid = true; 1837 break; 1838 } 1839 } 1840 } 1841 1842 // Exit the scope of this instantiation. 1843 SavedContext.pop(); 1844 1845 if (!Invalid) { 1846 Consumer.HandleTagDeclDefinition(Instantiation); 1847 1848 // Always emit the vtable for an explicit instantiation definition 1849 // of a polymorphic class template specialization. 1850 if (TSK == TSK_ExplicitInstantiationDefinition) 1851 MarkVTableUsed(PointOfInstantiation, Instantiation, true); 1852 } 1853 1854 return Invalid; 1855 } 1856 1857 namespace { 1858 /// \brief A partial specialization whose template arguments have matched 1859 /// a given template-id. 1860 struct PartialSpecMatchResult { 1861 ClassTemplatePartialSpecializationDecl *Partial; 1862 TemplateArgumentList *Args; 1863 }; 1864 } 1865 1866 bool 1867 Sema::InstantiateClassTemplateSpecialization( 1868 SourceLocation PointOfInstantiation, 1869 ClassTemplateSpecializationDecl *ClassTemplateSpec, 1870 TemplateSpecializationKind TSK, 1871 bool Complain) { 1872 // Perform the actual instantiation on the canonical declaration. 1873 ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>( 1874 ClassTemplateSpec->getCanonicalDecl()); 1875 1876 // Check whether we have already instantiated or specialized this class 1877 // template specialization. 1878 if (ClassTemplateSpec->getSpecializationKind() != TSK_Undeclared) { 1879 if (ClassTemplateSpec->getSpecializationKind() == 1880 TSK_ExplicitInstantiationDeclaration && 1881 TSK == TSK_ExplicitInstantiationDefinition) { 1882 // An explicit instantiation definition follows an explicit instantiation 1883 // declaration (C++0x [temp.explicit]p10); go ahead and perform the 1884 // explicit instantiation. 1885 ClassTemplateSpec->setSpecializationKind(TSK); 1886 1887 // If this is an explicit instantiation definition, mark the 1888 // vtable as used. 1889 if (TSK == TSK_ExplicitInstantiationDefinition) 1890 MarkVTableUsed(PointOfInstantiation, ClassTemplateSpec, true); 1891 1892 return false; 1893 } 1894 1895 // We can only instantiate something that hasn't already been 1896 // instantiated or specialized. Fail without any diagnostics: our 1897 // caller will provide an error message. 1898 return true; 1899 } 1900 1901 if (ClassTemplateSpec->isInvalidDecl()) 1902 return true; 1903 1904 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 1905 CXXRecordDecl *Pattern = 0; 1906 1907 // C++ [temp.class.spec.match]p1: 1908 // When a class template is used in a context that requires an 1909 // instantiation of the class, it is necessary to determine 1910 // whether the instantiation is to be generated using the primary 1911 // template or one of the partial specializations. This is done by 1912 // matching the template arguments of the class template 1913 // specialization with the template argument lists of the partial 1914 // specializations. 1915 typedef PartialSpecMatchResult MatchResult; 1916 SmallVector<MatchResult, 4> Matched; 1917 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 1918 Template->getPartialSpecializations(PartialSpecs); 1919 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 1920 ClassTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; 1921 TemplateDeductionInfo Info(Context, PointOfInstantiation); 1922 if (TemplateDeductionResult Result 1923 = DeduceTemplateArguments(Partial, 1924 ClassTemplateSpec->getTemplateArgs(), 1925 Info)) { 1926 // FIXME: Store the failed-deduction information for use in 1927 // diagnostics, later. 1928 (void)Result; 1929 } else { 1930 Matched.push_back(PartialSpecMatchResult()); 1931 Matched.back().Partial = Partial; 1932 Matched.back().Args = Info.take(); 1933 } 1934 } 1935 1936 // If we're dealing with a member template where the template parameters 1937 // have been instantiated, this provides the original template parameters 1938 // from which the member template's parameters were instantiated. 1939 SmallVector<const NamedDecl *, 4> InstantiatedTemplateParameters; 1940 1941 if (Matched.size() >= 1) { 1942 SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); 1943 if (Matched.size() == 1) { 1944 // -- If exactly one matching specialization is found, the 1945 // instantiation is generated from that specialization. 1946 // We don't need to do anything for this. 1947 } else { 1948 // -- If more than one matching specialization is found, the 1949 // partial order rules (14.5.4.2) are used to determine 1950 // whether one of the specializations is more specialized 1951 // than the others. If none of the specializations is more 1952 // specialized than all of the other matching 1953 // specializations, then the use of the class template is 1954 // ambiguous and the program is ill-formed. 1955 for (SmallVector<MatchResult, 4>::iterator P = Best + 1, 1956 PEnd = Matched.end(); 1957 P != PEnd; ++P) { 1958 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, 1959 PointOfInstantiation) 1960 == P->Partial) 1961 Best = P; 1962 } 1963 1964 // Determine if the best partial specialization is more specialized than 1965 // the others. 1966 bool Ambiguous = false; 1967 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), 1968 PEnd = Matched.end(); 1969 P != PEnd; ++P) { 1970 if (P != Best && 1971 getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, 1972 PointOfInstantiation) 1973 != Best->Partial) { 1974 Ambiguous = true; 1975 break; 1976 } 1977 } 1978 1979 if (Ambiguous) { 1980 // Partial ordering did not produce a clear winner. Complain. 1981 ClassTemplateSpec->setInvalidDecl(); 1982 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) 1983 << ClassTemplateSpec; 1984 1985 // Print the matching partial specializations. 1986 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), 1987 PEnd = Matched.end(); 1988 P != PEnd; ++P) 1989 Diag(P->Partial->getLocation(), diag::note_partial_spec_match) 1990 << getTemplateArgumentBindingsText( 1991 P->Partial->getTemplateParameters(), 1992 *P->Args); 1993 1994 return true; 1995 } 1996 } 1997 1998 // Instantiate using the best class template partial specialization. 1999 ClassTemplatePartialSpecializationDecl *OrigPartialSpec = Best->Partial; 2000 while (OrigPartialSpec->getInstantiatedFromMember()) { 2001 // If we've found an explicit specialization of this class template, 2002 // stop here and use that as the pattern. 2003 if (OrigPartialSpec->isMemberSpecialization()) 2004 break; 2005 2006 OrigPartialSpec = OrigPartialSpec->getInstantiatedFromMember(); 2007 } 2008 2009 Pattern = OrigPartialSpec; 2010 ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args); 2011 } else { 2012 // -- If no matches are found, the instantiation is generated 2013 // from the primary template. 2014 ClassTemplateDecl *OrigTemplate = Template; 2015 while (OrigTemplate->getInstantiatedFromMemberTemplate()) { 2016 // If we've found an explicit specialization of this class template, 2017 // stop here and use that as the pattern. 2018 if (OrigTemplate->isMemberSpecialization()) 2019 break; 2020 2021 OrigTemplate = OrigTemplate->getInstantiatedFromMemberTemplate(); 2022 } 2023 2024 Pattern = OrigTemplate->getTemplatedDecl(); 2025 } 2026 2027 bool Result = InstantiateClass(PointOfInstantiation, ClassTemplateSpec, 2028 Pattern, 2029 getTemplateInstantiationArgs(ClassTemplateSpec), 2030 TSK, 2031 Complain); 2032 2033 return Result; 2034 } 2035 2036 /// \brief Instantiates the definitions of all of the member 2037 /// of the given class, which is an instantiation of a class template 2038 /// or a member class of a template. 2039 void 2040 Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation, 2041 CXXRecordDecl *Instantiation, 2042 const MultiLevelTemplateArgumentList &TemplateArgs, 2043 TemplateSpecializationKind TSK) { 2044 for (DeclContext::decl_iterator D = Instantiation->decls_begin(), 2045 DEnd = Instantiation->decls_end(); 2046 D != DEnd; ++D) { 2047 bool SuppressNew = false; 2048 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(*D)) { 2049 if (FunctionDecl *Pattern 2050 = Function->getInstantiatedFromMemberFunction()) { 2051 MemberSpecializationInfo *MSInfo 2052 = Function->getMemberSpecializationInfo(); 2053 assert(MSInfo && "No member specialization information?"); 2054 if (MSInfo->getTemplateSpecializationKind() 2055 == TSK_ExplicitSpecialization) 2056 continue; 2057 2058 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 2059 Function, 2060 MSInfo->getTemplateSpecializationKind(), 2061 MSInfo->getPointOfInstantiation(), 2062 SuppressNew) || 2063 SuppressNew) 2064 continue; 2065 2066 if (Function->isDefined()) 2067 continue; 2068 2069 if (TSK == TSK_ExplicitInstantiationDefinition) { 2070 // C++0x [temp.explicit]p8: 2071 // An explicit instantiation definition that names a class template 2072 // specialization explicitly instantiates the class template 2073 // specialization and is only an explicit instantiation definition 2074 // of members whose definition is visible at the point of 2075 // instantiation. 2076 if (!Pattern->isDefined()) 2077 continue; 2078 2079 Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); 2080 2081 InstantiateFunctionDefinition(PointOfInstantiation, Function); 2082 } else { 2083 Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); 2084 } 2085 } 2086 } else if (VarDecl *Var = dyn_cast<VarDecl>(*D)) { 2087 if (Var->isStaticDataMember()) { 2088 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 2089 assert(MSInfo && "No member specialization information?"); 2090 if (MSInfo->getTemplateSpecializationKind() 2091 == TSK_ExplicitSpecialization) 2092 continue; 2093 2094 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 2095 Var, 2096 MSInfo->getTemplateSpecializationKind(), 2097 MSInfo->getPointOfInstantiation(), 2098 SuppressNew) || 2099 SuppressNew) 2100 continue; 2101 2102 if (TSK == TSK_ExplicitInstantiationDefinition) { 2103 // C++0x [temp.explicit]p8: 2104 // An explicit instantiation definition that names a class template 2105 // specialization explicitly instantiates the class template 2106 // specialization and is only an explicit instantiation definition 2107 // of members whose definition is visible at the point of 2108 // instantiation. 2109 if (!Var->getInstantiatedFromStaticDataMember() 2110 ->getOutOfLineDefinition()) 2111 continue; 2112 2113 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 2114 InstantiateStaticDataMemberDefinition(PointOfInstantiation, Var); 2115 } else { 2116 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 2117 } 2118 } 2119 } else if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(*D)) { 2120 // Always skip the injected-class-name, along with any 2121 // redeclarations of nested classes, since both would cause us 2122 // to try to instantiate the members of a class twice. 2123 if (Record->isInjectedClassName() || Record->getPreviousDeclaration()) 2124 continue; 2125 2126 MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo(); 2127 assert(MSInfo && "No member specialization information?"); 2128 2129 if (MSInfo->getTemplateSpecializationKind() 2130 == TSK_ExplicitSpecialization) 2131 continue; 2132 2133 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 2134 Record, 2135 MSInfo->getTemplateSpecializationKind(), 2136 MSInfo->getPointOfInstantiation(), 2137 SuppressNew) || 2138 SuppressNew) 2139 continue; 2140 2141 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); 2142 assert(Pattern && "Missing instantiated-from-template information"); 2143 2144 if (!Record->getDefinition()) { 2145 if (!Pattern->getDefinition()) { 2146 // C++0x [temp.explicit]p8: 2147 // An explicit instantiation definition that names a class template 2148 // specialization explicitly instantiates the class template 2149 // specialization and is only an explicit instantiation definition 2150 // of members whose definition is visible at the point of 2151 // instantiation. 2152 if (TSK == TSK_ExplicitInstantiationDeclaration) { 2153 MSInfo->setTemplateSpecializationKind(TSK); 2154 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2155 } 2156 2157 continue; 2158 } 2159 2160 InstantiateClass(PointOfInstantiation, Record, Pattern, 2161 TemplateArgs, 2162 TSK); 2163 } else { 2164 if (TSK == TSK_ExplicitInstantiationDefinition && 2165 Record->getTemplateSpecializationKind() == 2166 TSK_ExplicitInstantiationDeclaration) { 2167 Record->setTemplateSpecializationKind(TSK); 2168 MarkVTableUsed(PointOfInstantiation, Record, true); 2169 } 2170 } 2171 2172 Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition()); 2173 if (Pattern) 2174 InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs, 2175 TSK); 2176 } 2177 } 2178 } 2179 2180 /// \brief Instantiate the definitions of all of the members of the 2181 /// given class template specialization, which was named as part of an 2182 /// explicit instantiation. 2183 void 2184 Sema::InstantiateClassTemplateSpecializationMembers( 2185 SourceLocation PointOfInstantiation, 2186 ClassTemplateSpecializationDecl *ClassTemplateSpec, 2187 TemplateSpecializationKind TSK) { 2188 // C++0x [temp.explicit]p7: 2189 // An explicit instantiation that names a class template 2190 // specialization is an explicit instantion of the same kind 2191 // (declaration or definition) of each of its members (not 2192 // including members inherited from base classes) that has not 2193 // been previously explicitly specialized in the translation unit 2194 // containing the explicit instantiation, except as described 2195 // below. 2196 InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec, 2197 getTemplateInstantiationArgs(ClassTemplateSpec), 2198 TSK); 2199 } 2200 2201 StmtResult 2202 Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) { 2203 if (!S) 2204 return Owned(S); 2205 2206 TemplateInstantiator Instantiator(*this, TemplateArgs, 2207 SourceLocation(), 2208 DeclarationName()); 2209 return Instantiator.TransformStmt(S); 2210 } 2211 2212 ExprResult 2213 Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) { 2214 if (!E) 2215 return Owned(E); 2216 2217 TemplateInstantiator Instantiator(*this, TemplateArgs, 2218 SourceLocation(), 2219 DeclarationName()); 2220 return Instantiator.TransformExpr(E); 2221 } 2222 2223 bool Sema::SubstExprs(Expr **Exprs, unsigned NumExprs, bool IsCall, 2224 const MultiLevelTemplateArgumentList &TemplateArgs, 2225 SmallVectorImpl<Expr *> &Outputs) { 2226 if (NumExprs == 0) 2227 return false; 2228 2229 TemplateInstantiator Instantiator(*this, TemplateArgs, 2230 SourceLocation(), 2231 DeclarationName()); 2232 return Instantiator.TransformExprs(Exprs, NumExprs, IsCall, Outputs); 2233 } 2234 2235 NestedNameSpecifierLoc 2236 Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS, 2237 const MultiLevelTemplateArgumentList &TemplateArgs) { 2238 if (!NNS) 2239 return NestedNameSpecifierLoc(); 2240 2241 TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(), 2242 DeclarationName()); 2243 return Instantiator.TransformNestedNameSpecifierLoc(NNS); 2244 } 2245 2246 /// \brief Do template substitution on declaration name info. 2247 DeclarationNameInfo 2248 Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo, 2249 const MultiLevelTemplateArgumentList &TemplateArgs) { 2250 TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(), 2251 NameInfo.getName()); 2252 return Instantiator.TransformDeclarationNameInfo(NameInfo); 2253 } 2254 2255 TemplateName 2256 Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, 2257 TemplateName Name, SourceLocation Loc, 2258 const MultiLevelTemplateArgumentList &TemplateArgs) { 2259 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, 2260 DeclarationName()); 2261 CXXScopeSpec SS; 2262 SS.Adopt(QualifierLoc); 2263 return Instantiator.TransformTemplateName(SS, Name, Loc); 2264 } 2265 2266 bool Sema::Subst(const TemplateArgumentLoc *Args, unsigned NumArgs, 2267 TemplateArgumentListInfo &Result, 2268 const MultiLevelTemplateArgumentList &TemplateArgs) { 2269 TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(), 2270 DeclarationName()); 2271 2272 return Instantiator.TransformTemplateArguments(Args, NumArgs, Result); 2273 } 2274 2275 llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> * 2276 LocalInstantiationScope::findInstantiationOf(const Decl *D) { 2277 for (LocalInstantiationScope *Current = this; Current; 2278 Current = Current->Outer) { 2279 2280 // Check if we found something within this scope. 2281 const Decl *CheckD = D; 2282 do { 2283 LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD); 2284 if (Found != Current->LocalDecls.end()) 2285 return &Found->second; 2286 2287 // If this is a tag declaration, it's possible that we need to look for 2288 // a previous declaration. 2289 if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD)) 2290 CheckD = Tag->getPreviousDeclaration(); 2291 else 2292 CheckD = 0; 2293 } while (CheckD); 2294 2295 // If we aren't combined with our outer scope, we're done. 2296 if (!Current->CombineWithOuterScope) 2297 break; 2298 } 2299 2300 // If we didn't find the decl, then we either have a sema bug, or we have a 2301 // forward reference to a label declaration. Return null to indicate that 2302 // we have an uninstantiated label. 2303 assert(isa<LabelDecl>(D) && "declaration not instantiated in this scope"); 2304 return 0; 2305 } 2306 2307 void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) { 2308 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 2309 if (Stored.isNull()) 2310 Stored = Inst; 2311 else if (Stored.is<Decl *>()) { 2312 assert(Stored.get<Decl *>() == Inst && "Already instantiated this local"); 2313 Stored = Inst; 2314 } else 2315 LocalDecls[D].get<DeclArgumentPack *>()->push_back(Inst); 2316 } 2317 2318 void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D, 2319 Decl *Inst) { 2320 DeclArgumentPack *Pack = LocalDecls[D].get<DeclArgumentPack *>(); 2321 Pack->push_back(Inst); 2322 } 2323 2324 void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) { 2325 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 2326 assert(Stored.isNull() && "Already instantiated this local"); 2327 DeclArgumentPack *Pack = new DeclArgumentPack; 2328 Stored = Pack; 2329 ArgumentPacks.push_back(Pack); 2330 } 2331 2332 void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack, 2333 const TemplateArgument *ExplicitArgs, 2334 unsigned NumExplicitArgs) { 2335 assert((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) && 2336 "Already have a partially-substituted pack"); 2337 assert((!PartiallySubstitutedPack 2338 || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && 2339 "Wrong number of arguments in partially-substituted pack"); 2340 PartiallySubstitutedPack = Pack; 2341 ArgsInPartiallySubstitutedPack = ExplicitArgs; 2342 NumArgsInPartiallySubstitutedPack = NumExplicitArgs; 2343 } 2344 2345 NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack( 2346 const TemplateArgument **ExplicitArgs, 2347 unsigned *NumExplicitArgs) const { 2348 if (ExplicitArgs) 2349 *ExplicitArgs = 0; 2350 if (NumExplicitArgs) 2351 *NumExplicitArgs = 0; 2352 2353 for (const LocalInstantiationScope *Current = this; Current; 2354 Current = Current->Outer) { 2355 if (Current->PartiallySubstitutedPack) { 2356 if (ExplicitArgs) 2357 *ExplicitArgs = Current->ArgsInPartiallySubstitutedPack; 2358 if (NumExplicitArgs) 2359 *NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack; 2360 2361 return Current->PartiallySubstitutedPack; 2362 } 2363 2364 if (!Current->CombineWithOuterScope) 2365 break; 2366 } 2367 2368 return 0; 2369 } 2370
