SemaTemplateInstantiateDecl.cpp revision 60c93c9981c467738369702e7aa23fd58c2b6aac 
1//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl 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 for declarations.
10//
11//===----------------------------------------------------------------------===/
12#include "Sema.h"
13#include "Lookup.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/DeclTemplate.h"
17#include "clang/AST/DeclVisitor.h"
18#include "clang/AST/Expr.h"
19#include "clang/AST/ExprCXX.h"
20#include "clang/Basic/PrettyStackTrace.h"
21#include "clang/Lex/Preprocessor.h"
22
23using namespace clang;
24
25namespace {
26  class TemplateDeclInstantiator
27    : public DeclVisitor<TemplateDeclInstantiator, Decl *> {
28    Sema &SemaRef;
29    DeclContext *Owner;
30    const MultiLevelTemplateArgumentList &TemplateArgs;
31
32    void InstantiateAttrs(Decl *Tmpl, Decl *New);
33
34  public:
35    typedef Sema::OwningExprResult OwningExprResult;
36
37    TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner,
38                             const MultiLevelTemplateArgumentList &TemplateArgs)
39      : SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { }
40
41    // FIXME: Once we get closer to completion, replace these manually-written
42    // declarations with automatically-generated ones from
43    // clang/AST/DeclNodes.def.
44    Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D);
45    Decl *VisitNamespaceDecl(NamespaceDecl *D);
46    Decl *VisitTypedefDecl(TypedefDecl *D);
47    Decl *VisitVarDecl(VarDecl *D);
48    Decl *VisitFieldDecl(FieldDecl *D);
49    Decl *VisitStaticAssertDecl(StaticAssertDecl *D);
50    Decl *VisitEnumDecl(EnumDecl *D);
51    Decl *VisitEnumConstantDecl(EnumConstantDecl *D);
52    Decl *VisitFriendDecl(FriendDecl *D);
53    Decl *VisitFunctionDecl(FunctionDecl *D,
54                            TemplateParameterList *TemplateParams = 0);
55    Decl *VisitCXXRecordDecl(CXXRecordDecl *D);
56    Decl *VisitCXXMethodDecl(CXXMethodDecl *D,
57                             TemplateParameterList *TemplateParams = 0);
58    Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D);
59    Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D);
60    Decl *VisitCXXConversionDecl(CXXConversionDecl *D);
61    ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D);
62    Decl *VisitClassTemplateDecl(ClassTemplateDecl *D);
63    Decl *VisitClassTemplatePartialSpecializationDecl(
64                                    ClassTemplatePartialSpecializationDecl *D);
65    Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
66    Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
67    Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
68    Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
69    Decl *VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
70    Decl *VisitUsingDecl(UsingDecl *D);
71    Decl *VisitUsingShadowDecl(UsingShadowDecl *D);
72    Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
73    Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
74
75    // Base case. FIXME: Remove once we can instantiate everything.
76    Decl *VisitDecl(Decl *D) {
77      unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID(
78                                                            Diagnostic::Error,
79                                                   "cannot instantiate %0 yet");
80      SemaRef.Diag(D->getLocation(), DiagID)
81        << D->getDeclKindName();
82
83      return 0;
84    }
85
86    const LangOptions &getLangOptions() {
87      return SemaRef.getLangOptions();
88    }
89
90    // Helper functions for instantiating methods.
91    QualType SubstFunctionType(FunctionDecl *D,
92                             llvm::SmallVectorImpl<ParmVarDecl *> &Params);
93    bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl);
94    bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl);
95
96    TemplateParameterList *
97      SubstTemplateParams(TemplateParameterList *List);
98
99    bool InstantiateClassTemplatePartialSpecialization(
100                                              ClassTemplateDecl *ClassTemplate,
101                           ClassTemplatePartialSpecializationDecl *PartialSpec);
102  };
103}
104
105// FIXME: Is this too simple?
106void TemplateDeclInstantiator::InstantiateAttrs(Decl *Tmpl, Decl *New) {
107  for (const Attr *TmplAttr = Tmpl->getAttrs(); TmplAttr;
108       TmplAttr = TmplAttr->getNext()) {
109
110    // FIXME: Is cloning correct for all attributes?
111    Attr *NewAttr = TmplAttr->clone(SemaRef.Context);
112
113    New->addAttr(NewAttr);
114  }
115}
116
117Decl *
118TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
119  assert(false && "Translation units cannot be instantiated");
120  return D;
121}
122
123Decl *
124TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
125  assert(false && "Namespaces cannot be instantiated");
126  return D;
127}
128
129Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
130  bool Invalid = false;
131  TypeSourceInfo *DI = D->getTypeSourceInfo();
132  if (DI->getType()->isDependentType()) {
133    DI = SemaRef.SubstType(DI, TemplateArgs,
134                           D->getLocation(), D->getDeclName());
135    if (!DI) {
136      Invalid = true;
137      DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy);
138    }
139  }
140
141  // Create the new typedef
142  TypedefDecl *Typedef
143    = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(),
144                          D->getIdentifier(), DI);
145  if (Invalid)
146    Typedef->setInvalidDecl();
147
148  if (TypedefDecl *Prev = D->getPreviousDeclaration()) {
149    NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(Prev, TemplateArgs);
150    Typedef->setPreviousDeclaration(cast<TypedefDecl>(InstPrev));
151  }
152
153  Typedef->setAccess(D->getAccess());
154  Owner->addDecl(Typedef);
155
156  return Typedef;
157}
158
159/// \brief Instantiate the arguments provided as part of initialization.
160///
161/// \returns true if an error occurred, false otherwise.
162static bool InstantiateInitializationArguments(Sema &SemaRef,
163                                               Expr **Args, unsigned NumArgs,
164                           const MultiLevelTemplateArgumentList &TemplateArgs,
165                         llvm::SmallVectorImpl<SourceLocation> &FakeCommaLocs,
166                           ASTOwningVector<&ActionBase::DeleteExpr> &InitArgs) {
167  for (unsigned I = 0; I != NumArgs; ++I) {
168    // When we hit the first defaulted argument, break out of the loop:
169    // we don't pass those default arguments on.
170    if (Args[I]->isDefaultArgument())
171      break;
172
173    Sema::OwningExprResult Arg = SemaRef.SubstExpr(Args[I], TemplateArgs);
174    if (Arg.isInvalid())
175      return true;
176
177    Expr *ArgExpr = (Expr *)Arg.get();
178    InitArgs.push_back(Arg.release());
179
180    // FIXME: We're faking all of the comma locations. Do we need them?
181    FakeCommaLocs.push_back(
182                          SemaRef.PP.getLocForEndOfToken(ArgExpr->getLocEnd()));
183  }
184
185  return false;
186}
187
188Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
189  // Do substitution on the type of the declaration
190  TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(),
191                                         TemplateArgs,
192                                         D->getTypeSpecStartLoc(),
193                                         D->getDeclName());
194  if (!DI)
195    return 0;
196
197  // Build the instantiated declaration
198  VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner,
199                                 D->getLocation(), D->getIdentifier(),
200                                 DI->getType(), DI,
201                                 D->getStorageClass());
202  Var->setThreadSpecified(D->isThreadSpecified());
203  Var->setCXXDirectInitializer(D->hasCXXDirectInitializer());
204  Var->setDeclaredInCondition(D->isDeclaredInCondition());
205
206  // If we are instantiating a static data member defined
207  // out-of-line, the instantiation will have the same lexical
208  // context (which will be a namespace scope) as the template.
209  if (D->isOutOfLine())
210    Var->setLexicalDeclContext(D->getLexicalDeclContext());
211
212  Var->setAccess(D->getAccess());
213
214  // FIXME: In theory, we could have a previous declaration for variables that
215  // are not static data members.
216  bool Redeclaration = false;
217  // FIXME: having to fake up a LookupResult is dumb.
218  LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(),
219                        Sema::LookupOrdinaryName);
220  if (D->isStaticDataMember())
221    SemaRef.LookupQualifiedName(Previous, Owner, false);
222  SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration);
223
224  if (D->isOutOfLine()) {
225    D->getLexicalDeclContext()->addDecl(Var);
226    Owner->makeDeclVisibleInContext(Var);
227  } else {
228    Owner->addDecl(Var);
229  }
230
231  // Link instantiations of static data members back to the template from
232  // which they were instantiated.
233  if (Var->isStaticDataMember())
234    SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D,
235                                                     TSK_ImplicitInstantiation);
236
237  if (Var->getAnyInitializer()) {
238    // We already have an initializer in the class.
239  } else if (D->getInit()) {
240    if (Var->isStaticDataMember() && !D->isOutOfLine())
241      SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated);
242    else
243      SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
244
245    // Extract the initializer, skipping through any temporary-binding
246    // expressions and look at the subexpression as it was written.
247    Expr *DInit = D->getInit();
248    if (CXXExprWithTemporaries *ExprTemp
249          = dyn_cast<CXXExprWithTemporaries>(DInit))
250      DInit = ExprTemp->getSubExpr();
251    while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(DInit))
252      DInit = Binder->getSubExpr();
253    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(DInit))
254      DInit = ICE->getSubExprAsWritten();
255
256    if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(DInit)) {
257      // The initializer is a parenthesized list of expressions that is
258      // type-dependent. Instantiate each of the expressions; we'll be
259      // performing direct initialization with them.
260      llvm::SmallVector<SourceLocation, 4> CommaLocs;
261      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
262      if (!InstantiateInitializationArguments(SemaRef,
263                                              PLE->getExprs(),
264                                              PLE->getNumExprs(),
265                                              TemplateArgs,
266                                              CommaLocs, InitArgs)) {
267        // Add the direct initializer to the declaration.
268        SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
269                                              PLE->getLParenLoc(),
270                                              move_arg(InitArgs),
271                                              CommaLocs.data(),
272                                              PLE->getRParenLoc());
273      }
274    } else if (CXXConstructExpr *Construct =dyn_cast<CXXConstructExpr>(DInit)) {
275      // The initializer resolved to a constructor. Instantiate the constructor
276      // arguments.
277      llvm::SmallVector<SourceLocation, 4> CommaLocs;
278      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
279
280      if (!InstantiateInitializationArguments(SemaRef,
281                                              Construct->getArgs(),
282                                              Construct->getNumArgs(),
283                                              TemplateArgs,
284                                              CommaLocs, InitArgs)) {
285        if (D->hasCXXDirectInitializer()) {
286          SourceLocation FakeLParenLoc =
287            SemaRef.PP.getLocForEndOfToken(D->getLocation());
288          SourceLocation FakeRParenLoc = CommaLocs.empty()? FakeLParenLoc
289                                                          : CommaLocs.back();
290          SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
291                                                FakeLParenLoc,
292                                                move_arg(InitArgs),
293                                                CommaLocs.data(),
294                                                FakeRParenLoc);
295        } else if (InitArgs.size() == 1) {
296          Expr *Init = (Expr*)(InitArgs.take()[0]);
297          SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var),
298                                       SemaRef.Owned(Init),
299                                       false);
300        } else {
301          assert(InitArgs.size() == 0);
302          SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
303        }
304      }
305    } else {
306      OwningExprResult Init
307        = SemaRef.SubstExpr(D->getInit(), TemplateArgs);
308
309      // FIXME: Not happy about invalidating decls just because of a bad
310      // initializer, unless it affects the type.
311      if (Init.isInvalid())
312        Var->setInvalidDecl();
313      else
314        SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
315                                     D->hasCXXDirectInitializer());
316    }
317
318    SemaRef.PopExpressionEvaluationContext();
319  } else if (!Var->isStaticDataMember() || Var->isOutOfLine())
320    SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
321
322  return Var;
323}
324
325Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
326  bool Invalid = false;
327  TypeSourceInfo *DI = D->getTypeSourceInfo();
328  if (DI->getType()->isDependentType())  {
329    DI = SemaRef.SubstType(DI, TemplateArgs,
330                           D->getLocation(), D->getDeclName());
331    if (!DI) {
332      DI = D->getTypeSourceInfo();
333      Invalid = true;
334    } else if (DI->getType()->isFunctionType()) {
335      // C++ [temp.arg.type]p3:
336      //   If a declaration acquires a function type through a type
337      //   dependent on a template-parameter and this causes a
338      //   declaration that does not use the syntactic form of a
339      //   function declarator to have function type, the program is
340      //   ill-formed.
341      SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
342        << DI->getType();
343      Invalid = true;
344    }
345  }
346
347  Expr *BitWidth = D->getBitWidth();
348  if (Invalid)
349    BitWidth = 0;
350  else if (BitWidth) {
351    // The bit-width expression is not potentially evaluated.
352    EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
353
354    OwningExprResult InstantiatedBitWidth
355      = SemaRef.SubstExpr(BitWidth, TemplateArgs);
356    if (InstantiatedBitWidth.isInvalid()) {
357      Invalid = true;
358      BitWidth = 0;
359    } else
360      BitWidth = InstantiatedBitWidth.takeAs<Expr>();
361  }
362
363  FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(),
364                                            DI->getType(), DI,
365                                            cast<RecordDecl>(Owner),
366                                            D->getLocation(),
367                                            D->isMutable(),
368                                            BitWidth,
369                                            D->getTypeSpecStartLoc(),
370                                            D->getAccess(),
371                                            0);
372  if (!Field) {
373    cast<Decl>(Owner)->setInvalidDecl();
374    return 0;
375  }
376
377  InstantiateAttrs(D, Field);
378
379  if (Invalid)
380    Field->setInvalidDecl();
381
382  if (!Field->getDeclName()) {
383    // Keep track of where this decl came from.
384    SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D);
385  }
386
387  Field->setImplicit(D->isImplicit());
388  Field->setAccess(D->getAccess());
389  Owner->addDecl(Field);
390
391  return Field;
392}
393
394Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) {
395  FriendDecl::FriendUnion FU;
396
397  // Handle friend type expressions by simply substituting template
398  // parameters into the pattern type.
399  if (Type *Ty = D->getFriendType()) {
400    QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs,
401                                   D->getLocation(), DeclarationName());
402    if (T.isNull()) return 0;
403
404    assert(getLangOptions().CPlusPlus0x || T->isRecordType());
405    FU = T.getTypePtr();
406
407  // Handle everything else by appropriate substitution.
408  } else {
409    NamedDecl *ND = D->getFriendDecl();
410    assert(ND && "friend decl must be a decl or a type!");
411
412    // FIXME: We have a problem here, because the nested call to Visit(ND)
413    // will inject the thing that the friend references into the current
414    // owner, which is wrong.
415    Decl *NewND;
416
417    // Hack to make this work almost well pending a rewrite.
418    if (ND->getDeclContext()->isRecord()) {
419      if (!ND->getDeclContext()->isDependentContext()) {
420        NewND = SemaRef.FindInstantiatedDecl(ND, TemplateArgs);
421      } else {
422        // FIXME: Hack to avoid crashing when incorrectly trying to instantiate
423        // templated friend declarations. This doesn't produce a correct AST;
424        // however this is sufficient for some AST analysis. The real solution
425        // must be put in place during the pending rewrite. See PR5848.
426        return 0;
427      }
428    } else if (D->wasSpecialization()) {
429      // Totally egregious hack to work around PR5866
430      return 0;
431    } else
432      NewND = Visit(ND);
433    if (!NewND) return 0;
434
435    FU = cast<NamedDecl>(NewND);
436  }
437
438  FriendDecl *FD =
439    FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU,
440                       D->getFriendLoc());
441  FD->setAccess(AS_public);
442  Owner->addDecl(FD);
443  return FD;
444}
445
446Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
447  Expr *AssertExpr = D->getAssertExpr();
448
449  // The expression in a static assertion is not potentially evaluated.
450  EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
451
452  OwningExprResult InstantiatedAssertExpr
453    = SemaRef.SubstExpr(AssertExpr, TemplateArgs);
454  if (InstantiatedAssertExpr.isInvalid())
455    return 0;
456
457  OwningExprResult Message(SemaRef, D->getMessage());
458  D->getMessage()->Retain();
459  Decl *StaticAssert
460    = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
461                                           move(InstantiatedAssertExpr),
462                                           move(Message)).getAs<Decl>();
463  return StaticAssert;
464}
465
466Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
467  EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner,
468                                    D->getLocation(), D->getIdentifier(),
469                                    D->getTagKeywordLoc(),
470                                    /*PrevDecl=*/0);
471  Enum->setInstantiationOfMemberEnum(D);
472  Enum->setAccess(D->getAccess());
473  Owner->addDecl(Enum);
474  Enum->startDefinition();
475
476  llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators;
477
478  EnumConstantDecl *LastEnumConst = 0;
479  for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
480         ECEnd = D->enumerator_end();
481       EC != ECEnd; ++EC) {
482    // The specified value for the enumerator.
483    OwningExprResult Value = SemaRef.Owned((Expr *)0);
484    if (Expr *UninstValue = EC->getInitExpr()) {
485      // The enumerator's value expression is not potentially evaluated.
486      EnterExpressionEvaluationContext Unevaluated(SemaRef,
487                                                   Action::Unevaluated);
488
489      Value = SemaRef.SubstExpr(UninstValue, TemplateArgs);
490    }
491
492    // Drop the initial value and continue.
493    bool isInvalid = false;
494    if (Value.isInvalid()) {
495      Value = SemaRef.Owned((Expr *)0);
496      isInvalid = true;
497    }
498
499    EnumConstantDecl *EnumConst
500      = SemaRef.CheckEnumConstant(Enum, LastEnumConst,
501                                  EC->getLocation(), EC->getIdentifier(),
502                                  move(Value));
503
504    if (isInvalid) {
505      if (EnumConst)
506        EnumConst->setInvalidDecl();
507      Enum->setInvalidDecl();
508    }
509
510    if (EnumConst) {
511      EnumConst->setAccess(Enum->getAccess());
512      Enum->addDecl(EnumConst);
513      Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst));
514      LastEnumConst = EnumConst;
515    }
516  }
517
518  // FIXME: Fixup LBraceLoc and RBraceLoc
519  // FIXME: Empty Scope and AttributeList (required to handle attribute packed).
520  SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(),
521                        Sema::DeclPtrTy::make(Enum),
522                        &Enumerators[0], Enumerators.size(),
523                        0, 0);
524
525  return Enum;
526}
527
528Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
529  assert(false && "EnumConstantDecls can only occur within EnumDecls.");
530  return 0;
531}
532
533namespace {
534  class SortDeclByLocation {
535    SourceManager &SourceMgr;
536
537  public:
538    explicit SortDeclByLocation(SourceManager &SourceMgr)
539      : SourceMgr(SourceMgr) { }
540
541    bool operator()(const Decl *X, const Decl *Y) const {
542      return SourceMgr.isBeforeInTranslationUnit(X->getLocation(),
543                                                 Y->getLocation());
544    }
545  };
546}
547
548Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
549  // Create a local instantiation scope for this class template, which
550  // will contain the instantiations of the template parameters.
551  Sema::LocalInstantiationScope Scope(SemaRef);
552  TemplateParameterList *TempParams = D->getTemplateParameters();
553  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
554  if (!InstParams)
555    return NULL;
556
557  CXXRecordDecl *Pattern = D->getTemplatedDecl();
558  CXXRecordDecl *RecordInst
559    = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner,
560                            Pattern->getLocation(), Pattern->getIdentifier(),
561                            Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL,
562                            /*DelayTypeCreation=*/true);
563
564  ClassTemplateDecl *Inst
565    = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(),
566                                D->getIdentifier(), InstParams, RecordInst, 0);
567  RecordInst->setDescribedClassTemplate(Inst);
568  if (D->getFriendObjectKind())
569    Inst->setObjectOfFriendDecl(true);
570  else
571    Inst->setAccess(D->getAccess());
572  Inst->setInstantiatedFromMemberTemplate(D);
573
574  // Trigger creation of the type for the instantiation.
575  SemaRef.Context.getTypeDeclType(RecordInst);
576
577  // Finish handling of friends.
578  if (Inst->getFriendObjectKind()) {
579    return Inst;
580  }
581
582  Inst->setAccess(D->getAccess());
583  Owner->addDecl(Inst);
584
585  // First, we sort the partial specializations by location, so
586  // that we instantiate them in the order they were declared.
587  llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
588  for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator
589         P = D->getPartialSpecializations().begin(),
590         PEnd = D->getPartialSpecializations().end();
591       P != PEnd; ++P)
592    PartialSpecs.push_back(&*P);
593  std::sort(PartialSpecs.begin(), PartialSpecs.end(),
594            SortDeclByLocation(SemaRef.SourceMgr));
595
596  // Instantiate all of the partial specializations of this member class
597  // template.
598  for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
599    InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]);
600
601  return Inst;
602}
603
604Decl *
605TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl(
606                                   ClassTemplatePartialSpecializationDecl *D) {
607  ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
608
609  // Lookup the already-instantiated declaration in the instantiation
610  // of the class template and return that.
611  DeclContext::lookup_result Found
612    = Owner->lookup(ClassTemplate->getDeclName());
613  if (Found.first == Found.second)
614    return 0;
615
616  ClassTemplateDecl *InstClassTemplate
617    = dyn_cast<ClassTemplateDecl>(*Found.first);
618  if (!InstClassTemplate)
619    return 0;
620
621  Decl *DCanon = D->getCanonicalDecl();
622  for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator
623            P = InstClassTemplate->getPartialSpecializations().begin(),
624         PEnd = InstClassTemplate->getPartialSpecializations().end();
625       P != PEnd; ++P) {
626    if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
627      return &*P;
628  }
629
630  return 0;
631}
632
633Decl *
634TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
635  // Create a local instantiation scope for this function template, which
636  // will contain the instantiations of the template parameters and then get
637  // merged with the local instantiation scope for the function template
638  // itself.
639  Sema::LocalInstantiationScope Scope(SemaRef);
640
641  TemplateParameterList *TempParams = D->getTemplateParameters();
642  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
643  if (!InstParams)
644    return NULL;
645
646  FunctionDecl *Instantiated = 0;
647  if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl()))
648    Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod,
649                                                                 InstParams));
650  else
651    Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl(
652                                                          D->getTemplatedDecl(),
653                                                                InstParams));
654
655  if (!Instantiated)
656    return 0;
657
658  Instantiated->setAccess(D->getAccess());
659
660  // Link the instantiated function template declaration to the function
661  // template from which it was instantiated.
662  FunctionTemplateDecl *InstTemplate
663    = Instantiated->getDescribedFunctionTemplate();
664  InstTemplate->setAccess(D->getAccess());
665  assert(InstTemplate &&
666         "VisitFunctionDecl/CXXMethodDecl didn't create a template!");
667
668  // Link the instantiation back to the pattern *unless* this is a
669  // non-definition friend declaration.
670  if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
671      !(InstTemplate->getFriendObjectKind() &&
672        !D->getTemplatedDecl()->isThisDeclarationADefinition()))
673    InstTemplate->setInstantiatedFromMemberTemplate(D);
674
675  // Add non-friends into the owner.
676  if (!InstTemplate->getFriendObjectKind())
677    Owner->addDecl(InstTemplate);
678  return InstTemplate;
679}
680
681Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
682  CXXRecordDecl *PrevDecl = 0;
683  if (D->isInjectedClassName())
684    PrevDecl = cast<CXXRecordDecl>(Owner);
685  else if (D->getPreviousDeclaration()) {
686    NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getPreviousDeclaration(),
687                                                   TemplateArgs);
688    if (!Prev) return 0;
689    PrevDecl = cast<CXXRecordDecl>(Prev);
690  }
691
692  CXXRecordDecl *Record
693    = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
694                            D->getLocation(), D->getIdentifier(),
695                            D->getTagKeywordLoc(), PrevDecl);
696  Record->setImplicit(D->isImplicit());
697  // FIXME: Check against AS_none is an ugly hack to work around the issue that
698  // the tag decls introduced by friend class declarations don't have an access
699  // specifier. Remove once this area of the code gets sorted out.
700  if (D->getAccess() != AS_none)
701    Record->setAccess(D->getAccess());
702  if (!D->isInjectedClassName())
703    Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
704
705  // If the original function was part of a friend declaration,
706  // inherit its namespace state.
707  if (Decl::FriendObjectKind FOK = D->getFriendObjectKind())
708    Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared);
709
710  Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion());
711
712  Owner->addDecl(Record);
713  return Record;
714}
715
716/// Normal class members are of more specific types and therefore
717/// don't make it here.  This function serves two purposes:
718///   1) instantiating function templates
719///   2) substituting friend declarations
720/// FIXME: preserve function definitions in case #2
721Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
722                                       TemplateParameterList *TemplateParams) {
723  // Check whether there is already a function template specialization for
724  // this declaration.
725  FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
726  void *InsertPos = 0;
727  if (FunctionTemplate && !TemplateParams) {
728    llvm::FoldingSetNodeID ID;
729    FunctionTemplateSpecializationInfo::Profile(ID,
730                             TemplateArgs.getInnermost().getFlatArgumentList(),
731                                       TemplateArgs.getInnermost().flat_size(),
732                                                SemaRef.Context);
733
734    FunctionTemplateSpecializationInfo *Info
735      = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
736                                                                   InsertPos);
737
738    // If we already have a function template specialization, return it.
739    if (Info)
740      return Info->Function;
741  }
742
743  bool MergeWithParentScope = (TemplateParams != 0) ||
744    !(isa<Decl>(Owner) &&
745      cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
746  Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
747
748  llvm::SmallVector<ParmVarDecl *, 4> Params;
749  QualType T = SubstFunctionType(D, Params);
750  if (T.isNull())
751    return 0;
752
753  // If we're instantiating a local function declaration, put the result
754  // in the owner;  otherwise we need to find the instantiated context.
755  DeclContext *DC;
756  if (D->getDeclContext()->isFunctionOrMethod())
757    DC = Owner;
758  else
759    DC = SemaRef.FindInstantiatedContext(D->getDeclContext(), TemplateArgs);
760
761  FunctionDecl *Function =
762      FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(),
763                           D->getDeclName(), T, D->getTypeSourceInfo(),
764                           D->getStorageClass(),
765                           D->isInlineSpecified(), D->hasWrittenPrototype());
766  Function->setLexicalDeclContext(Owner);
767
768  // Attach the parameters
769  for (unsigned P = 0; P < Params.size(); ++P)
770    Params[P]->setOwningFunction(Function);
771  Function->setParams(SemaRef.Context, Params.data(), Params.size());
772
773  if (TemplateParams) {
774    // Our resulting instantiation is actually a function template, since we
775    // are substituting only the outer template parameters. For example, given
776    //
777    //   template<typename T>
778    //   struct X {
779    //     template<typename U> friend void f(T, U);
780    //   };
781    //
782    //   X<int> x;
783    //
784    // We are instantiating the friend function template "f" within X<int>,
785    // which means substituting int for T, but leaving "f" as a friend function
786    // template.
787    // Build the function template itself.
788    FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Owner,
789                                                    Function->getLocation(),
790                                                    Function->getDeclName(),
791                                                    TemplateParams, Function);
792    Function->setDescribedFunctionTemplate(FunctionTemplate);
793    FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
794  } else if (FunctionTemplate) {
795    // Record this function template specialization.
796    Function->setFunctionTemplateSpecialization(SemaRef.Context,
797                                                FunctionTemplate,
798                                                &TemplateArgs.getInnermost(),
799                                                InsertPos);
800  }
801
802  if (InitFunctionInstantiation(Function, D))
803    Function->setInvalidDecl();
804
805  bool Redeclaration = false;
806  bool OverloadableAttrRequired = false;
807
808  LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(),
809                        Sema::LookupOrdinaryName, Sema::ForRedeclaration);
810
811  if (TemplateParams || !FunctionTemplate) {
812    // Look only into the namespace where the friend would be declared to
813    // find a previous declaration. This is the innermost enclosing namespace,
814    // as described in ActOnFriendFunctionDecl.
815    SemaRef.LookupQualifiedName(Previous, DC);
816
817    // In C++, the previous declaration we find might be a tag type
818    // (class or enum). In this case, the new declaration will hide the
819    // tag type. Note that this does does not apply if we're declaring a
820    // typedef (C++ [dcl.typedef]p4).
821    if (Previous.isSingleTagDecl())
822      Previous.clear();
823  }
824
825  SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous,
826                                   false, Redeclaration,
827                                   /*FIXME:*/OverloadableAttrRequired);
828
829  // If the original function was part of a friend declaration,
830  // inherit its namespace state and add it to the owner.
831  NamedDecl *FromFriendD
832      = TemplateParams? cast<NamedDecl>(D->getDescribedFunctionTemplate()) : D;
833  if (FromFriendD->getFriendObjectKind()) {
834    NamedDecl *ToFriendD = 0;
835    NamedDecl *PrevDecl;
836    if (TemplateParams) {
837      ToFriendD = cast<NamedDecl>(FunctionTemplate);
838      PrevDecl = FunctionTemplate->getPreviousDeclaration();
839    } else {
840      ToFriendD = Function;
841      PrevDecl = Function->getPreviousDeclaration();
842    }
843    ToFriendD->setObjectOfFriendDecl(PrevDecl != NULL);
844    if (!Owner->isDependentContext() && !PrevDecl)
845      DC->makeDeclVisibleInContext(ToFriendD, /* Recoverable = */ false);
846
847    if (!TemplateParams)
848      Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
849  }
850
851  return Function;
852}
853
854Decl *
855TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
856                                      TemplateParameterList *TemplateParams) {
857  FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
858  void *InsertPos = 0;
859  if (FunctionTemplate && !TemplateParams) {
860    // We are creating a function template specialization from a function
861    // template. Check whether there is already a function template
862    // specialization for this particular set of template arguments.
863    llvm::FoldingSetNodeID ID;
864    FunctionTemplateSpecializationInfo::Profile(ID,
865                            TemplateArgs.getInnermost().getFlatArgumentList(),
866                                      TemplateArgs.getInnermost().flat_size(),
867                                                SemaRef.Context);
868
869    FunctionTemplateSpecializationInfo *Info
870      = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
871                                                                   InsertPos);
872
873    // If we already have a function template specialization, return it.
874    if (Info)
875      return Info->Function;
876  }
877
878  bool MergeWithParentScope = (TemplateParams != 0) ||
879    !(isa<Decl>(Owner) &&
880      cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
881  Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
882
883  llvm::SmallVector<ParmVarDecl *, 4> Params;
884  QualType T = SubstFunctionType(D, Params);
885  if (T.isNull())
886    return 0;
887
888  // Build the instantiated method declaration.
889  CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
890  CXXMethodDecl *Method = 0;
891
892  DeclarationName Name = D->getDeclName();
893  if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
894    QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
895    Name = SemaRef.Context.DeclarationNames.getCXXConstructorName(
896                                    SemaRef.Context.getCanonicalType(ClassTy));
897    Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
898                                        Constructor->getLocation(),
899                                        Name, T,
900                                        Constructor->getTypeSourceInfo(),
901                                        Constructor->isExplicit(),
902                                        Constructor->isInlineSpecified(), false);
903  } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
904    QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
905    Name = SemaRef.Context.DeclarationNames.getCXXDestructorName(
906                                   SemaRef.Context.getCanonicalType(ClassTy));
907    Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
908                                       Destructor->getLocation(), Name,
909                                       T, Destructor->isInlineSpecified(), false);
910  } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
911    CanQualType ConvTy
912      = SemaRef.Context.getCanonicalType(
913                                      T->getAs<FunctionType>()->getResultType());
914    Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName(
915                                                                      ConvTy);
916    Method = CXXConversionDecl::Create(SemaRef.Context, Record,
917                                       Conversion->getLocation(), Name,
918                                       T, Conversion->getTypeSourceInfo(),
919                                       Conversion->isInlineSpecified(),
920                                       Conversion->isExplicit());
921  } else {
922    Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(),
923                                   D->getDeclName(), T, D->getTypeSourceInfo(),
924                                   D->isStatic(), D->isInlineSpecified());
925  }
926
927  if (TemplateParams) {
928    // Our resulting instantiation is actually a function template, since we
929    // are substituting only the outer template parameters. For example, given
930    //
931    //   template<typename T>
932    //   struct X {
933    //     template<typename U> void f(T, U);
934    //   };
935    //
936    //   X<int> x;
937    //
938    // We are instantiating the member template "f" within X<int>, which means
939    // substituting int for T, but leaving "f" as a member function template.
940    // Build the function template itself.
941    FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record,
942                                                    Method->getLocation(),
943                                                    Method->getDeclName(),
944                                                    TemplateParams, Method);
945    if (D->isOutOfLine())
946      FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
947    Method->setDescribedFunctionTemplate(FunctionTemplate);
948  } else if (FunctionTemplate) {
949    // Record this function template specialization.
950    Method->setFunctionTemplateSpecialization(SemaRef.Context,
951                                              FunctionTemplate,
952                                              &TemplateArgs.getInnermost(),
953                                              InsertPos);
954  } else {
955    // Record that this is an instantiation of a member function.
956    Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
957  }
958
959  // If we are instantiating a member function defined
960  // out-of-line, the instantiation will have the same lexical
961  // context (which will be a namespace scope) as the template.
962  if (D->isOutOfLine())
963    Method->setLexicalDeclContext(D->getLexicalDeclContext());
964
965  // Attach the parameters
966  for (unsigned P = 0; P < Params.size(); ++P)
967    Params[P]->setOwningFunction(Method);
968  Method->setParams(SemaRef.Context, Params.data(), Params.size());
969
970  if (InitMethodInstantiation(Method, D))
971    Method->setInvalidDecl();
972
973  LookupResult Previous(SemaRef, Name, SourceLocation(),
974                        Sema::LookupOrdinaryName, Sema::ForRedeclaration);
975
976  if (!FunctionTemplate || TemplateParams) {
977    SemaRef.LookupQualifiedName(Previous, Owner);
978
979    // In C++, the previous declaration we find might be a tag type
980    // (class or enum). In this case, the new declaration will hide the
981    // tag type. Note that this does does not apply if we're declaring a
982    // typedef (C++ [dcl.typedef]p4).
983    if (Previous.isSingleTagDecl())
984      Previous.clear();
985  }
986
987  bool Redeclaration = false;
988  bool OverloadableAttrRequired = false;
989  SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration,
990                                   /*FIXME:*/OverloadableAttrRequired);
991
992  if (D->isPure())
993    SemaRef.CheckPureMethod(Method, SourceRange());
994
995  Method->setAccess(D->getAccess());
996
997  if (!FunctionTemplate && (!Method->isInvalidDecl() || Previous.empty()) &&
998      !Method->getFriendObjectKind())
999    Owner->addDecl(Method);
1000
1001  return Method;
1002}
1003
1004Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1005  return VisitCXXMethodDecl(D);
1006}
1007
1008Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1009  return VisitCXXMethodDecl(D);
1010}
1011
1012Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
1013  return VisitCXXMethodDecl(D);
1014}
1015
1016ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
1017  QualType T;
1018  TypeSourceInfo *DI = D->getTypeSourceInfo();
1019  if (DI) {
1020    DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
1021                           D->getDeclName());
1022    if (DI) T = DI->getType();
1023  } else {
1024    T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(),
1025                          D->getDeclName());
1026    DI = 0;
1027  }
1028
1029  if (T.isNull())
1030    return 0;
1031
1032  T = SemaRef.adjustParameterType(T);
1033
1034  // Allocate the parameter
1035  ParmVarDecl *Param
1036    = ParmVarDecl::Create(SemaRef.Context,
1037                          SemaRef.Context.getTranslationUnitDecl(),
1038                          D->getLocation(),
1039                          D->getIdentifier(), T, DI, D->getStorageClass(), 0);
1040
1041  // Mark the default argument as being uninstantiated.
1042  if (D->hasUninstantiatedDefaultArg())
1043    Param->setUninstantiatedDefaultArg(D->getUninstantiatedDefaultArg());
1044  else if (Expr *Arg = D->getDefaultArg())
1045    Param->setUninstantiatedDefaultArg(Arg);
1046
1047  // Note: we don't try to instantiate function parameters until after
1048  // we've instantiated the function's type. Therefore, we don't have
1049  // to check for 'void' parameter types here.
1050  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1051  return Param;
1052}
1053
1054Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
1055                                                    TemplateTypeParmDecl *D) {
1056  // TODO: don't always clone when decls are refcounted.
1057  const Type* T = D->getTypeForDecl();
1058  assert(T->isTemplateTypeParmType());
1059  const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>();
1060
1061  TemplateTypeParmDecl *Inst =
1062    TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1063                                 TTPT->getDepth() - 1, TTPT->getIndex(),
1064                                 TTPT->getName(),
1065                                 D->wasDeclaredWithTypename(),
1066                                 D->isParameterPack());
1067
1068  if (D->hasDefaultArgument())
1069    Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false);
1070
1071  // Introduce this template parameter's instantiation into the instantiation
1072  // scope.
1073  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst);
1074
1075  return Inst;
1076}
1077
1078Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
1079                                                 NonTypeTemplateParmDecl *D) {
1080  // Substitute into the type of the non-type template parameter.
1081  QualType T;
1082  TypeSourceInfo *DI = D->getTypeSourceInfo();
1083  if (DI) {
1084    DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
1085                           D->getDeclName());
1086    if (DI) T = DI->getType();
1087  } else {
1088    T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(),
1089                          D->getDeclName());
1090    DI = 0;
1091  }
1092  if (T.isNull())
1093    return 0;
1094
1095  // Check that this type is acceptable for a non-type template parameter.
1096  bool Invalid = false;
1097  T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation());
1098  if (T.isNull()) {
1099    T = SemaRef.Context.IntTy;
1100    Invalid = true;
1101  }
1102
1103  NonTypeTemplateParmDecl *Param
1104    = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1105                                      D->getDepth() - 1, D->getPosition(),
1106                                      D->getIdentifier(), T, DI);
1107  if (Invalid)
1108    Param->setInvalidDecl();
1109
1110  Param->setDefaultArgument(D->getDefaultArgument());
1111
1112  // Introduce this template parameter's instantiation into the instantiation
1113  // scope.
1114  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1115  return Param;
1116}
1117
1118Decl *
1119TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
1120                                                  TemplateTemplateParmDecl *D) {
1121  // Instantiate the template parameter list of the template template parameter.
1122  TemplateParameterList *TempParams = D->getTemplateParameters();
1123  TemplateParameterList *InstParams;
1124  {
1125    // Perform the actual substitution of template parameters within a new,
1126    // local instantiation scope.
1127    Sema::LocalInstantiationScope Scope(SemaRef);
1128    InstParams = SubstTemplateParams(TempParams);
1129    if (!InstParams)
1130      return NULL;
1131  }
1132
1133  // Build the template template parameter.
1134  TemplateTemplateParmDecl *Param
1135    = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1136                                       D->getDepth() - 1, D->getPosition(),
1137                                       D->getIdentifier(), InstParams);
1138  Param->setDefaultArgument(D->getDefaultArgument());
1139
1140  // Introduce this template parameter's instantiation into the instantiation
1141  // scope.
1142  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1143
1144  return Param;
1145}
1146
1147Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1148  // Using directives are never dependent, so they require no explicit
1149
1150  UsingDirectiveDecl *Inst
1151    = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1152                                 D->getNamespaceKeyLocation(),
1153                                 D->getQualifierRange(), D->getQualifier(),
1154                                 D->getIdentLocation(),
1155                                 D->getNominatedNamespace(),
1156                                 D->getCommonAncestor());
1157  Owner->addDecl(Inst);
1158  return Inst;
1159}
1160
1161Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
1162  // The nested name specifier is non-dependent, so no transformation
1163  // is required.
1164
1165  // We only need to do redeclaration lookups if we're in a class
1166  // scope (in fact, it's not really even possible in non-class
1167  // scopes).
1168  bool CheckRedeclaration = Owner->isRecord();
1169
1170  LookupResult Prev(SemaRef, D->getDeclName(), D->getLocation(),
1171                    Sema::LookupUsingDeclName, Sema::ForRedeclaration);
1172
1173  UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
1174                                       D->getLocation(),
1175                                       D->getNestedNameRange(),
1176                                       D->getUsingLocation(),
1177                                       D->getTargetNestedNameDecl(),
1178                                       D->getDeclName(),
1179                                       D->isTypeName());
1180
1181  CXXScopeSpec SS;
1182  SS.setScopeRep(D->getTargetNestedNameDecl());
1183  SS.setRange(D->getNestedNameRange());
1184
1185  if (CheckRedeclaration) {
1186    Prev.setHideTags(false);
1187    SemaRef.LookupQualifiedName(Prev, Owner);
1188
1189    // Check for invalid redeclarations.
1190    if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(),
1191                                            D->isTypeName(), SS,
1192                                            D->getLocation(), Prev))
1193      NewUD->setInvalidDecl();
1194
1195  }
1196
1197  if (!NewUD->isInvalidDecl() &&
1198      SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS,
1199                                      D->getLocation()))
1200    NewUD->setInvalidDecl();
1201
1202  SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
1203  NewUD->setAccess(D->getAccess());
1204  Owner->addDecl(NewUD);
1205
1206  // Don't process the shadow decls for an invalid decl.
1207  if (NewUD->isInvalidDecl())
1208    return NewUD;
1209
1210  bool isFunctionScope = Owner->isFunctionOrMethod();
1211
1212  // Process the shadow decls.
1213  for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end();
1214         I != E; ++I) {
1215    UsingShadowDecl *Shadow = *I;
1216    NamedDecl *InstTarget =
1217      cast<NamedDecl>(SemaRef.FindInstantiatedDecl(Shadow->getTargetDecl(),
1218                                                   TemplateArgs));
1219
1220    if (CheckRedeclaration &&
1221        SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev))
1222      continue;
1223
1224    UsingShadowDecl *InstShadow
1225      = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget);
1226    SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
1227
1228    if (isFunctionScope)
1229      SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow);
1230  }
1231
1232  return NewUD;
1233}
1234
1235Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
1236  // Ignore these;  we handle them in bulk when processing the UsingDecl.
1237  return 0;
1238}
1239
1240Decl * TemplateDeclInstantiator
1241    ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1242  NestedNameSpecifier *NNS =
1243    SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
1244                                     D->getTargetNestedNameRange(),
1245                                     TemplateArgs);
1246  if (!NNS)
1247    return 0;
1248
1249  CXXScopeSpec SS;
1250  SS.setRange(D->getTargetNestedNameRange());
1251  SS.setScopeRep(NNS);
1252
1253  NamedDecl *UD =
1254    SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
1255                                  D->getUsingLoc(), SS, D->getLocation(),
1256                                  D->getDeclName(), 0,
1257                                  /*instantiation*/ true,
1258                                  /*typename*/ true, D->getTypenameLoc());
1259  if (UD)
1260    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
1261
1262  return UD;
1263}
1264
1265Decl * TemplateDeclInstantiator
1266    ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1267  NestedNameSpecifier *NNS =
1268    SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
1269                                     D->getTargetNestedNameRange(),
1270                                     TemplateArgs);
1271  if (!NNS)
1272    return 0;
1273
1274  CXXScopeSpec SS;
1275  SS.setRange(D->getTargetNestedNameRange());
1276  SS.setScopeRep(NNS);
1277
1278  NamedDecl *UD =
1279    SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
1280                                  D->getUsingLoc(), SS, D->getLocation(),
1281                                  D->getDeclName(), 0,
1282                                  /*instantiation*/ true,
1283                                  /*typename*/ false, SourceLocation());
1284  if (UD)
1285    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
1286
1287  return UD;
1288}
1289
1290Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner,
1291                      const MultiLevelTemplateArgumentList &TemplateArgs) {
1292  TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
1293  return Instantiator.Visit(D);
1294}
1295
1296/// \brief Instantiates a nested template parameter list in the current
1297/// instantiation context.
1298///
1299/// \param L The parameter list to instantiate
1300///
1301/// \returns NULL if there was an error
1302TemplateParameterList *
1303TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) {
1304  // Get errors for all the parameters before bailing out.
1305  bool Invalid = false;
1306
1307  unsigned N = L->size();
1308  typedef llvm::SmallVector<NamedDecl *, 8> ParamVector;
1309  ParamVector Params;
1310  Params.reserve(N);
1311  for (TemplateParameterList::iterator PI = L->begin(), PE = L->end();
1312       PI != PE; ++PI) {
1313    NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI));
1314    Params.push_back(D);
1315    Invalid = Invalid || !D || D->isInvalidDecl();
1316  }
1317
1318  // Clean up if we had an error.
1319  if (Invalid) {
1320    for (ParamVector::iterator PI = Params.begin(), PE = Params.end();
1321         PI != PE; ++PI)
1322      if (*PI)
1323        (*PI)->Destroy(SemaRef.Context);
1324    return NULL;
1325  }
1326
1327  TemplateParameterList *InstL
1328    = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
1329                                    L->getLAngleLoc(), &Params.front(), N,
1330                                    L->getRAngleLoc());
1331  return InstL;
1332}
1333
1334/// \brief Instantiate the declaration of a class template partial
1335/// specialization.
1336///
1337/// \param ClassTemplate the (instantiated) class template that is partially
1338// specialized by the instantiation of \p PartialSpec.
1339///
1340/// \param PartialSpec the (uninstantiated) class template partial
1341/// specialization that we are instantiating.
1342///
1343/// \returns true if there was an error, false otherwise.
1344bool
1345TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(
1346                                            ClassTemplateDecl *ClassTemplate,
1347                          ClassTemplatePartialSpecializationDecl *PartialSpec) {
1348  // Create a local instantiation scope for this class template partial
1349  // specialization, which will contain the instantiations of the template
1350  // parameters.
1351  Sema::LocalInstantiationScope Scope(SemaRef);
1352
1353  // Substitute into the template parameters of the class template partial
1354  // specialization.
1355  TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
1356  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1357  if (!InstParams)
1358    return true;
1359
1360  // Substitute into the template arguments of the class template partial
1361  // specialization.
1362  const TemplateArgumentLoc *PartialSpecTemplateArgs
1363    = PartialSpec->getTemplateArgsAsWritten();
1364  unsigned N = PartialSpec->getNumTemplateArgsAsWritten();
1365
1366  TemplateArgumentListInfo InstTemplateArgs; // no angle locations
1367  for (unsigned I = 0; I != N; ++I) {
1368    TemplateArgumentLoc Loc;
1369    if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs))
1370      return true;
1371    InstTemplateArgs.addArgument(Loc);
1372  }
1373
1374
1375  // Check that the template argument list is well-formed for this
1376  // class template.
1377  TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(),
1378                                        InstTemplateArgs.size());
1379  if (SemaRef.CheckTemplateArgumentList(ClassTemplate,
1380                                        PartialSpec->getLocation(),
1381                                        InstTemplateArgs,
1382                                        false,
1383                                        Converted))
1384    return true;
1385
1386  // Figure out where to insert this class template partial specialization
1387  // in the member template's set of class template partial specializations.
1388  llvm::FoldingSetNodeID ID;
1389  ClassTemplatePartialSpecializationDecl::Profile(ID,
1390                                                  Converted.getFlatArguments(),
1391                                                  Converted.flatSize(),
1392                                                  SemaRef.Context);
1393  void *InsertPos = 0;
1394  ClassTemplateSpecializationDecl *PrevDecl
1395    = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID,
1396                                                                     InsertPos);
1397
1398  // Build the canonical type that describes the converted template
1399  // arguments of the class template partial specialization.
1400  QualType CanonType
1401    = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
1402                                                  Converted.getFlatArguments(),
1403                                                    Converted.flatSize());
1404
1405  // Build the fully-sugared type for this class template
1406  // specialization as the user wrote in the specialization
1407  // itself. This means that we'll pretty-print the type retrieved
1408  // from the specialization's declaration the way that the user
1409  // actually wrote the specialization, rather than formatting the
1410  // name based on the "canonical" representation used to store the
1411  // template arguments in the specialization.
1412  QualType WrittenTy
1413    = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
1414                                                    InstTemplateArgs,
1415                                                    CanonType);
1416
1417  if (PrevDecl) {
1418    // We've already seen a partial specialization with the same template
1419    // parameters and template arguments. This can happen, for example, when
1420    // substituting the outer template arguments ends up causing two
1421    // class template partial specializations of a member class template
1422    // to have identical forms, e.g.,
1423    //
1424    //   template<typename T, typename U>
1425    //   struct Outer {
1426    //     template<typename X, typename Y> struct Inner;
1427    //     template<typename Y> struct Inner<T, Y>;
1428    //     template<typename Y> struct Inner<U, Y>;
1429    //   };
1430    //
1431    //   Outer<int, int> outer; // error: the partial specializations of Inner
1432    //                          // have the same signature.
1433    SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared)
1434      << WrittenTy;
1435    SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here)
1436      << SemaRef.Context.getTypeDeclType(PrevDecl);
1437    return true;
1438  }
1439
1440
1441  // Create the class template partial specialization declaration.
1442  ClassTemplatePartialSpecializationDecl *InstPartialSpec
1443    = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, Owner,
1444                                                     PartialSpec->getLocation(),
1445                                                     InstParams,
1446                                                     ClassTemplate,
1447                                                     Converted,
1448                                                     InstTemplateArgs,
1449                                                     0);
1450  InstPartialSpec->setInstantiatedFromMember(PartialSpec);
1451  InstPartialSpec->setTypeAsWritten(WrittenTy);
1452
1453  // Add this partial specialization to the set of class template partial
1454  // specializations.
1455  ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec,
1456                                                        InsertPos);
1457  return false;
1458}
1459
1460/// \brief Does substitution on the type of the given function, including
1461/// all of the function parameters.
1462///
1463/// \param D The function whose type will be the basis of the substitution
1464///
1465/// \param Params the instantiated parameter declarations
1466
1467/// \returns the instantiated function's type if successful, a NULL
1468/// type if there was an error.
1469QualType
1470TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D,
1471                              llvm::SmallVectorImpl<ParmVarDecl *> &Params) {
1472  bool InvalidDecl = false;
1473
1474  // Substitute all of the function's formal parameter types.
1475  TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs);
1476  llvm::SmallVector<QualType, 4> ParamTys;
1477  for (FunctionDecl::param_iterator P = D->param_begin(),
1478                                 PEnd = D->param_end();
1479       P != PEnd; ++P) {
1480    if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) {
1481      if (PInst->getType()->isVoidType()) {
1482        SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type);
1483        PInst->setInvalidDecl();
1484      } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(),
1485                                                PInst->getType(),
1486                                                diag::err_abstract_type_in_decl,
1487                                                Sema::AbstractParamType))
1488        PInst->setInvalidDecl();
1489
1490      Params.push_back(PInst);
1491      ParamTys.push_back(PInst->getType());
1492
1493      if (PInst->isInvalidDecl())
1494        InvalidDecl = true;
1495    } else
1496      InvalidDecl = true;
1497  }
1498
1499  // FIXME: Deallocate dead declarations.
1500  if (InvalidDecl)
1501    return QualType();
1502
1503  const FunctionProtoType *Proto = D->getType()->getAs<FunctionProtoType>();
1504  assert(Proto && "Missing prototype?");
1505  QualType ResultType
1506    = SemaRef.SubstType(Proto->getResultType(), TemplateArgs,
1507                        D->getLocation(), D->getDeclName());
1508  if (ResultType.isNull())
1509    return QualType();
1510
1511  return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(),
1512                                   Proto->isVariadic(), Proto->getTypeQuals(),
1513                                   D->getLocation(), D->getDeclName());
1514}
1515
1516/// \brief Initializes the common fields of an instantiation function
1517/// declaration (New) from the corresponding fields of its template (Tmpl).
1518///
1519/// \returns true if there was an error
1520bool
1521TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
1522                                                    FunctionDecl *Tmpl) {
1523  if (Tmpl->isDeleted())
1524    New->setDeleted();
1525
1526  // If we are performing substituting explicitly-specified template arguments
1527  // or deduced template arguments into a function template and we reach this
1528  // point, we are now past the point where SFINAE applies and have committed
1529  // to keeping the new function template specialization. We therefore
1530  // convert the active template instantiation for the function template
1531  // into a template instantiation for this specific function template
1532  // specialization, which is not a SFINAE context, so that we diagnose any
1533  // further errors in the declaration itself.
1534  typedef Sema::ActiveTemplateInstantiation ActiveInstType;
1535  ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
1536  if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
1537      ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
1538    if (FunctionTemplateDecl *FunTmpl
1539          = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) {
1540      assert(FunTmpl->getTemplatedDecl() == Tmpl &&
1541             "Deduction from the wrong function template?");
1542      (void) FunTmpl;
1543      ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
1544      ActiveInst.Entity = reinterpret_cast<uintptr_t>(New);
1545      --SemaRef.NonInstantiationEntries;
1546    }
1547  }
1548
1549  const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
1550  assert(Proto && "Function template without prototype?");
1551
1552  if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() ||
1553      Proto->getNoReturnAttr()) {
1554    // The function has an exception specification or a "noreturn"
1555    // attribute. Substitute into each of the exception types.
1556    llvm::SmallVector<QualType, 4> Exceptions;
1557    for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) {
1558      // FIXME: Poor location information!
1559      QualType T
1560        = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs,
1561                            New->getLocation(), New->getDeclName());
1562      if (T.isNull() ||
1563          SemaRef.CheckSpecifiedExceptionType(T, New->getLocation()))
1564        continue;
1565
1566      Exceptions.push_back(T);
1567    }
1568
1569    // Rebuild the function type
1570
1571    const FunctionProtoType *NewProto
1572      = New->getType()->getAs<FunctionProtoType>();
1573    assert(NewProto && "Template instantiation without function prototype?");
1574    New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
1575                                                 NewProto->arg_type_begin(),
1576                                                 NewProto->getNumArgs(),
1577                                                 NewProto->isVariadic(),
1578                                                 NewProto->getTypeQuals(),
1579                                                 Proto->hasExceptionSpec(),
1580                                                 Proto->hasAnyExceptionSpec(),
1581                                                 Exceptions.size(),
1582                                                 Exceptions.data(),
1583                                                 Proto->getNoReturnAttr(),
1584                                                 Proto->getCallConv()));
1585  }
1586
1587  return false;
1588}
1589
1590/// \brief Initializes common fields of an instantiated method
1591/// declaration (New) from the corresponding fields of its template
1592/// (Tmpl).
1593///
1594/// \returns true if there was an error
1595bool
1596TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
1597                                                  CXXMethodDecl *Tmpl) {
1598  if (InitFunctionInstantiation(New, Tmpl))
1599    return true;
1600
1601  CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
1602  New->setAccess(Tmpl->getAccess());
1603  if (Tmpl->isVirtualAsWritten())
1604    Record->setMethodAsVirtual(New);
1605
1606  // FIXME: attributes
1607  // FIXME: New needs a pointer to Tmpl
1608  return false;
1609}
1610
1611/// \brief Instantiate the definition of the given function from its
1612/// template.
1613///
1614/// \param PointOfInstantiation the point at which the instantiation was
1615/// required. Note that this is not precisely a "point of instantiation"
1616/// for the function, but it's close.
1617///
1618/// \param Function the already-instantiated declaration of a
1619/// function template specialization or member function of a class template
1620/// specialization.
1621///
1622/// \param Recursive if true, recursively instantiates any functions that
1623/// are required by this instantiation.
1624///
1625/// \param DefinitionRequired if true, then we are performing an explicit
1626/// instantiation where the body of the function is required. Complain if
1627/// there is no such body.
1628void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
1629                                         FunctionDecl *Function,
1630                                         bool Recursive,
1631                                         bool DefinitionRequired) {
1632  if (Function->isInvalidDecl())
1633    return;
1634
1635  assert(!Function->getBody() && "Already instantiated!");
1636
1637  // Never instantiate an explicit specialization.
1638  if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
1639    return;
1640
1641  // Find the function body that we'll be substituting.
1642  const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
1643  Stmt *Pattern = 0;
1644  if (PatternDecl)
1645    Pattern = PatternDecl->getBody(PatternDecl);
1646
1647  if (!Pattern) {
1648    if (DefinitionRequired) {
1649      if (Function->getPrimaryTemplate())
1650        Diag(PointOfInstantiation,
1651             diag::err_explicit_instantiation_undefined_func_template)
1652          << Function->getPrimaryTemplate();
1653      else
1654        Diag(PointOfInstantiation,
1655             diag::err_explicit_instantiation_undefined_member)
1656          << 1 << Function->getDeclName() << Function->getDeclContext();
1657
1658      if (PatternDecl)
1659        Diag(PatternDecl->getLocation(),
1660             diag::note_explicit_instantiation_here);
1661    }
1662
1663    return;
1664  }
1665
1666  // C++0x [temp.explicit]p9:
1667  //   Except for inline functions, other explicit instantiation declarations
1668  //   have the effect of suppressing the implicit instantiation of the entity
1669  //   to which they refer.
1670  if (Function->getTemplateSpecializationKind()
1671        == TSK_ExplicitInstantiationDeclaration &&
1672      !PatternDecl->isInlined())
1673    return;
1674
1675  InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
1676  if (Inst)
1677    return;
1678
1679  // If we're performing recursive template instantiation, create our own
1680  // queue of pending implicit instantiations that we will instantiate later,
1681  // while we're still within our own instantiation context.
1682  std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
1683  if (Recursive)
1684    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1685
1686  ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function));
1687
1688  // Introduce a new scope where local variable instantiations will be
1689  // recorded, unless we're actually a member function within a local
1690  // class, in which case we need to merge our results with the parent
1691  // scope (of the enclosing function).
1692  bool MergeWithParentScope = false;
1693  if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext()))
1694    MergeWithParentScope = Rec->isLocalClass();
1695
1696  LocalInstantiationScope Scope(*this, MergeWithParentScope);
1697
1698  // Introduce the instantiated function parameters into the local
1699  // instantiation scope.
1700  for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I)
1701    Scope.InstantiatedLocal(PatternDecl->getParamDecl(I),
1702                            Function->getParamDecl(I));
1703
1704  // Enter the scope of this instantiation. We don't use
1705  // PushDeclContext because we don't have a scope.
1706  DeclContext *PreviousContext = CurContext;
1707  CurContext = Function;
1708
1709  MultiLevelTemplateArgumentList TemplateArgs =
1710    getTemplateInstantiationArgs(Function);
1711
1712  // If this is a constructor, instantiate the member initializers.
1713  if (const CXXConstructorDecl *Ctor =
1714        dyn_cast<CXXConstructorDecl>(PatternDecl)) {
1715    InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor,
1716                               TemplateArgs);
1717  }
1718
1719  // Instantiate the function body.
1720  OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs);
1721
1722  if (Body.isInvalid())
1723    Function->setInvalidDecl();
1724
1725  ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body),
1726                          /*IsInstantiation=*/true);
1727
1728  CurContext = PreviousContext;
1729
1730  DeclGroupRef DG(Function);
1731  Consumer.HandleTopLevelDecl(DG);
1732
1733  // This class may have local implicit instantiations that need to be
1734  // instantiation within this scope.
1735  PerformPendingImplicitInstantiations(/*LocalOnly=*/true);
1736  Scope.Exit();
1737
1738  if (Recursive) {
1739    // Instantiate any pending implicit instantiations found during the
1740    // instantiation of this template.
1741    PerformPendingImplicitInstantiations();
1742
1743    // Restore the set of pending implicit instantiations.
1744    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1745  }
1746}
1747
1748/// \brief Instantiate the definition of the given variable from its
1749/// template.
1750///
1751/// \param PointOfInstantiation the point at which the instantiation was
1752/// required. Note that this is not precisely a "point of instantiation"
1753/// for the function, but it's close.
1754///
1755/// \param Var the already-instantiated declaration of a static member
1756/// variable of a class template specialization.
1757///
1758/// \param Recursive if true, recursively instantiates any functions that
1759/// are required by this instantiation.
1760///
1761/// \param DefinitionRequired if true, then we are performing an explicit
1762/// instantiation where an out-of-line definition of the member variable
1763/// is required. Complain if there is no such definition.
1764void Sema::InstantiateStaticDataMemberDefinition(
1765                                          SourceLocation PointOfInstantiation,
1766                                                 VarDecl *Var,
1767                                                 bool Recursive,
1768                                                 bool DefinitionRequired) {
1769  if (Var->isInvalidDecl())
1770    return;
1771
1772  // Find the out-of-line definition of this static data member.
1773  VarDecl *Def = Var->getInstantiatedFromStaticDataMember();
1774  assert(Def && "This data member was not instantiated from a template?");
1775  assert(Def->isStaticDataMember() && "Not a static data member?");
1776  Def = Def->getOutOfLineDefinition();
1777
1778  if (!Def) {
1779    // We did not find an out-of-line definition of this static data member,
1780    // so we won't perform any instantiation. Rather, we rely on the user to
1781    // instantiate this definition (or provide a specialization for it) in
1782    // another translation unit.
1783    if (DefinitionRequired) {
1784      Def = Var->getInstantiatedFromStaticDataMember();
1785      Diag(PointOfInstantiation,
1786           diag::err_explicit_instantiation_undefined_member)
1787        << 2 << Var->getDeclName() << Var->getDeclContext();
1788      Diag(Def->getLocation(), diag::note_explicit_instantiation_here);
1789    }
1790
1791    return;
1792  }
1793
1794  // Never instantiate an explicit specialization.
1795  if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
1796    return;
1797
1798  // C++0x [temp.explicit]p9:
1799  //   Except for inline functions, other explicit instantiation declarations
1800  //   have the effect of suppressing the implicit instantiation of the entity
1801  //   to which they refer.
1802  if (Var->getTemplateSpecializationKind()
1803        == TSK_ExplicitInstantiationDeclaration)
1804    return;
1805
1806  InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
1807  if (Inst)
1808    return;
1809
1810  // If we're performing recursive template instantiation, create our own
1811  // queue of pending implicit instantiations that we will instantiate later,
1812  // while we're still within our own instantiation context.
1813  std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
1814  if (Recursive)
1815    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1816
1817  // Enter the scope of this instantiation. We don't use
1818  // PushDeclContext because we don't have a scope.
1819  DeclContext *PreviousContext = CurContext;
1820  CurContext = Var->getDeclContext();
1821
1822  VarDecl *OldVar = Var;
1823  Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(),
1824                                          getTemplateInstantiationArgs(Var)));
1825  CurContext = PreviousContext;
1826
1827  if (Var) {
1828    MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo();
1829    assert(MSInfo && "Missing member specialization information?");
1830    Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(),
1831                                       MSInfo->getPointOfInstantiation());
1832    DeclGroupRef DG(Var);
1833    Consumer.HandleTopLevelDecl(DG);
1834  }
1835
1836  if (Recursive) {
1837    // Instantiate any pending implicit instantiations found during the
1838    // instantiation of this template.
1839    PerformPendingImplicitInstantiations();
1840
1841    // Restore the set of pending implicit instantiations.
1842    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1843  }
1844}
1845
1846void
1847Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
1848                                 const CXXConstructorDecl *Tmpl,
1849                           const MultiLevelTemplateArgumentList &TemplateArgs) {
1850
1851  llvm::SmallVector<MemInitTy*, 4> NewInits;
1852  bool AnyErrors = false;
1853
1854  // Instantiate all the initializers.
1855  for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(),
1856                                            InitsEnd = Tmpl->init_end();
1857       Inits != InitsEnd; ++Inits) {
1858    CXXBaseOrMemberInitializer *Init = *Inits;
1859
1860    ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this);
1861    llvm::SmallVector<SourceLocation, 4> CommaLocs;
1862
1863    // Instantiate all the arguments.
1864    Expr *InitE = Init->getInit();
1865    if (!InitE) {
1866      // Nothing to instantiate;
1867    } else if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(InitE)) {
1868      if (InstantiateInitializationArguments(*this, ParenList->getExprs(),
1869                                             ParenList->getNumExprs(),
1870                                             TemplateArgs, CommaLocs,
1871                                             NewArgs)) {
1872        AnyErrors = true;
1873        continue;
1874      }
1875    } else {
1876      OwningExprResult InitArg = SubstExpr(InitE, TemplateArgs);
1877      if (InitArg.isInvalid()) {
1878        AnyErrors = true;
1879        continue;
1880      }
1881
1882      NewArgs.push_back(InitArg.release());
1883    }
1884
1885    MemInitResult NewInit;
1886    if (Init->isBaseInitializer()) {
1887      TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(),
1888                                            TemplateArgs,
1889                                            Init->getSourceLocation(),
1890                                            New->getDeclName());
1891      if (!BaseTInfo) {
1892        AnyErrors = true;
1893        New->setInvalidDecl();
1894        continue;
1895      }
1896
1897      NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo,
1898                                     (Expr **)NewArgs.data(),
1899                                     NewArgs.size(),
1900                                     Init->getLParenLoc(),
1901                                     Init->getRParenLoc(),
1902                                     New->getParent());
1903    } else if (Init->isMemberInitializer()) {
1904      FieldDecl *Member;
1905
1906      // Is this an anonymous union?
1907      if (FieldDecl *UnionInit = Init->getAnonUnionMember())
1908        Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit, TemplateArgs));
1909      else
1910        Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember(),
1911                                                      TemplateArgs));
1912
1913      NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(),
1914                                       NewArgs.size(),
1915                                       Init->getSourceLocation(),
1916                                       Init->getLParenLoc(),
1917                                       Init->getRParenLoc());
1918    }
1919
1920    if (NewInit.isInvalid()) {
1921      AnyErrors = true;
1922      New->setInvalidDecl();
1923    } else {
1924      // FIXME: It would be nice if ASTOwningVector had a release function.
1925      NewArgs.take();
1926
1927      NewInits.push_back((MemInitTy *)NewInit.get());
1928    }
1929  }
1930
1931  // Assign all the initializers to the new constructor.
1932  ActOnMemInitializers(DeclPtrTy::make(New),
1933                       /*FIXME: ColonLoc */
1934                       SourceLocation(),
1935                       NewInits.data(), NewInits.size(),
1936                       AnyErrors);
1937}
1938
1939// TODO: this could be templated if the various decl types used the
1940// same method name.
1941static bool isInstantiationOf(ClassTemplateDecl *Pattern,
1942                              ClassTemplateDecl *Instance) {
1943  Pattern = Pattern->getCanonicalDecl();
1944
1945  do {
1946    Instance = Instance->getCanonicalDecl();
1947    if (Pattern == Instance) return true;
1948    Instance = Instance->getInstantiatedFromMemberTemplate();
1949  } while (Instance);
1950
1951  return false;
1952}
1953
1954static bool isInstantiationOf(FunctionTemplateDecl *Pattern,
1955                              FunctionTemplateDecl *Instance) {
1956  Pattern = Pattern->getCanonicalDecl();
1957
1958  do {
1959    Instance = Instance->getCanonicalDecl();
1960    if (Pattern == Instance) return true;
1961    Instance = Instance->getInstantiatedFromMemberTemplate();
1962  } while (Instance);
1963
1964  return false;
1965}
1966
1967static bool
1968isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern,
1969                  ClassTemplatePartialSpecializationDecl *Instance) {
1970  Pattern
1971    = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl());
1972  do {
1973    Instance = cast<ClassTemplatePartialSpecializationDecl>(
1974                                                Instance->getCanonicalDecl());
1975    if (Pattern == Instance)
1976      return true;
1977    Instance = Instance->getInstantiatedFromMember();
1978  } while (Instance);
1979
1980  return false;
1981}
1982
1983static bool isInstantiationOf(CXXRecordDecl *Pattern,
1984                              CXXRecordDecl *Instance) {
1985  Pattern = Pattern->getCanonicalDecl();
1986
1987  do {
1988    Instance = Instance->getCanonicalDecl();
1989    if (Pattern == Instance) return true;
1990    Instance = Instance->getInstantiatedFromMemberClass();
1991  } while (Instance);
1992
1993  return false;
1994}
1995
1996static bool isInstantiationOf(FunctionDecl *Pattern,
1997                              FunctionDecl *Instance) {
1998  Pattern = Pattern->getCanonicalDecl();
1999
2000  do {
2001    Instance = Instance->getCanonicalDecl();
2002    if (Pattern == Instance) return true;
2003    Instance = Instance->getInstantiatedFromMemberFunction();
2004  } while (Instance);
2005
2006  return false;
2007}
2008
2009static bool isInstantiationOf(EnumDecl *Pattern,
2010                              EnumDecl *Instance) {
2011  Pattern = Pattern->getCanonicalDecl();
2012
2013  do {
2014    Instance = Instance->getCanonicalDecl();
2015    if (Pattern == Instance) return true;
2016    Instance = Instance->getInstantiatedFromMemberEnum();
2017  } while (Instance);
2018
2019  return false;
2020}
2021
2022static bool isInstantiationOf(UsingShadowDecl *Pattern,
2023                              UsingShadowDecl *Instance,
2024                              ASTContext &C) {
2025  return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern;
2026}
2027
2028static bool isInstantiationOf(UsingDecl *Pattern,
2029                              UsingDecl *Instance,
2030                              ASTContext &C) {
2031  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2032}
2033
2034static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern,
2035                              UsingDecl *Instance,
2036                              ASTContext &C) {
2037  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2038}
2039
2040static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern,
2041                              UsingDecl *Instance,
2042                              ASTContext &C) {
2043  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2044}
2045
2046static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
2047                                              VarDecl *Instance) {
2048  assert(Instance->isStaticDataMember());
2049
2050  Pattern = Pattern->getCanonicalDecl();
2051
2052  do {
2053    Instance = Instance->getCanonicalDecl();
2054    if (Pattern == Instance) return true;
2055    Instance = Instance->getInstantiatedFromStaticDataMember();
2056  } while (Instance);
2057
2058  return false;
2059}
2060
2061// Other is the prospective instantiation
2062// D is the prospective pattern
2063static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
2064  if (D->getKind() != Other->getKind()) {
2065    if (UnresolvedUsingTypenameDecl *UUD
2066          = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
2067      if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
2068        return isInstantiationOf(UUD, UD, Ctx);
2069      }
2070    }
2071
2072    if (UnresolvedUsingValueDecl *UUD
2073          = dyn_cast<UnresolvedUsingValueDecl>(D)) {
2074      if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
2075        return isInstantiationOf(UUD, UD, Ctx);
2076      }
2077    }
2078
2079    return false;
2080  }
2081
2082  if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other))
2083    return isInstantiationOf(cast<CXXRecordDecl>(D), Record);
2084
2085  if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other))
2086    return isInstantiationOf(cast<FunctionDecl>(D), Function);
2087
2088  if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other))
2089    return isInstantiationOf(cast<EnumDecl>(D), Enum);
2090
2091  if (VarDecl *Var = dyn_cast<VarDecl>(Other))
2092    if (Var->isStaticDataMember())
2093      return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var);
2094
2095  if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other))
2096    return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp);
2097
2098  if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other))
2099    return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp);
2100
2101  if (ClassTemplatePartialSpecializationDecl *PartialSpec
2102        = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other))
2103    return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D),
2104                             PartialSpec);
2105
2106  if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) {
2107    if (!Field->getDeclName()) {
2108      // This is an unnamed field.
2109      return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) ==
2110        cast<FieldDecl>(D);
2111    }
2112  }
2113
2114  if (UsingDecl *Using = dyn_cast<UsingDecl>(Other))
2115    return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
2116
2117  if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other))
2118    return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
2119
2120  return D->getDeclName() && isa<NamedDecl>(Other) &&
2121    D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
2122}
2123
2124template<typename ForwardIterator>
2125static NamedDecl *findInstantiationOf(ASTContext &Ctx,
2126                                      NamedDecl *D,
2127                                      ForwardIterator first,
2128                                      ForwardIterator last) {
2129  for (; first != last; ++first)
2130    if (isInstantiationOf(Ctx, D, *first))
2131      return cast<NamedDecl>(*first);
2132
2133  return 0;
2134}
2135
2136/// \brief Finds the instantiation of the given declaration context
2137/// within the current instantiation.
2138///
2139/// \returns NULL if there was an error
2140DeclContext *Sema::FindInstantiatedContext(DeclContext* DC,
2141                          const MultiLevelTemplateArgumentList &TemplateArgs) {
2142  if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) {
2143    Decl* ID = FindInstantiatedDecl(D, TemplateArgs);
2144    return cast_or_null<DeclContext>(ID);
2145  } else return DC;
2146}
2147
2148/// \brief Find the instantiation of the given declaration within the
2149/// current instantiation.
2150///
2151/// This routine is intended to be used when \p D is a declaration
2152/// referenced from within a template, that needs to mapped into the
2153/// corresponding declaration within an instantiation. For example,
2154/// given:
2155///
2156/// \code
2157/// template<typename T>
2158/// struct X {
2159///   enum Kind {
2160///     KnownValue = sizeof(T)
2161///   };
2162///
2163///   bool getKind() const { return KnownValue; }
2164/// };
2165///
2166/// template struct X<int>;
2167/// \endcode
2168///
2169/// In the instantiation of X<int>::getKind(), we need to map the
2170/// EnumConstantDecl for KnownValue (which refers to
2171/// X<T>::<Kind>::KnownValue) to its instantiation
2172/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs
2173/// this mapping from within the instantiation of X<int>.
2174NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D,
2175                          const MultiLevelTemplateArgumentList &TemplateArgs) {
2176  DeclContext *ParentDC = D->getDeclContext();
2177  if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) ||
2178      isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) ||
2179      ParentDC->isFunctionOrMethod()) {
2180    // D is a local of some kind. Look into the map of local
2181    // declarations to their instantiations.
2182    return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D));
2183  }
2184
2185  if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
2186    if (!Record->isDependentContext())
2187      return D;
2188
2189    // If the RecordDecl is actually the injected-class-name or a
2190    // "templated" declaration for a class template, class template
2191    // partial specialization, or a member class of a class template,
2192    // substitute into the injected-class-name of the class template
2193    // or partial specialization to find the new DeclContext.
2194    QualType T;
2195    ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate();
2196
2197    if (ClassTemplate) {
2198      T = ClassTemplate->getInjectedClassNameType(Context);
2199    } else if (ClassTemplatePartialSpecializationDecl *PartialSpec
2200                 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2201      T = Context.getTypeDeclType(Record);
2202      ClassTemplate = PartialSpec->getSpecializedTemplate();
2203    }
2204
2205    if (!T.isNull()) {
2206      // Substitute into the injected-class-name to get the type
2207      // corresponding to the instantiation we want, which may also be
2208      // the current instantiation (if we're in a template
2209      // definition). This substitution should never fail, since we
2210      // know we can instantiate the injected-class-name or we
2211      // wouldn't have gotten to the injected-class-name!
2212
2213      // FIXME: Can we use the CurrentInstantiationScope to avoid this
2214      // extra instantiation in the common case?
2215      T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName());
2216      assert(!T.isNull() && "Instantiation of injected-class-name cannot fail.");
2217
2218      if (!T->isDependentType()) {
2219        assert(T->isRecordType() && "Instantiation must produce a record type");
2220        return T->getAs<RecordType>()->getDecl();
2221      }
2222
2223      // We are performing "partial" template instantiation to create
2224      // the member declarations for the members of a class template
2225      // specialization. Therefore, D is actually referring to something
2226      // in the current instantiation. Look through the current
2227      // context, which contains actual instantiations, to find the
2228      // instantiation of the "current instantiation" that D refers
2229      // to.
2230      bool SawNonDependentContext = false;
2231      for (DeclContext *DC = CurContext; !DC->isFileContext();
2232           DC = DC->getParent()) {
2233        if (ClassTemplateSpecializationDecl *Spec
2234                          = dyn_cast<ClassTemplateSpecializationDecl>(DC))
2235          if (isInstantiationOf(ClassTemplate,
2236                                Spec->getSpecializedTemplate()))
2237            return Spec;
2238
2239        if (!DC->isDependentContext())
2240          SawNonDependentContext = true;
2241      }
2242
2243      // We're performing "instantiation" of a member of the current
2244      // instantiation while we are type-checking the
2245      // definition. Compute the declaration context and return that.
2246      assert(!SawNonDependentContext &&
2247             "No dependent context while instantiating record");
2248      DeclContext *DC = computeDeclContext(T);
2249      assert(DC &&
2250             "Unable to find declaration for the current instantiation");
2251      return cast<CXXRecordDecl>(DC);
2252    }
2253
2254    // Fall through to deal with other dependent record types (e.g.,
2255    // anonymous unions in class templates).
2256  }
2257
2258  if (!ParentDC->isDependentContext())
2259    return D;
2260
2261  ParentDC = FindInstantiatedContext(ParentDC, TemplateArgs);
2262  if (!ParentDC)
2263    return 0;
2264
2265  if (ParentDC != D->getDeclContext()) {
2266    // We performed some kind of instantiation in the parent context,
2267    // so now we need to look into the instantiated parent context to
2268    // find the instantiation of the declaration D.
2269    NamedDecl *Result = 0;
2270    if (D->getDeclName()) {
2271      DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
2272      Result = findInstantiationOf(Context, D, Found.first, Found.second);
2273    } else {
2274      // Since we don't have a name for the entity we're looking for,
2275      // our only option is to walk through all of the declarations to
2276      // find that name. This will occur in a few cases:
2277      //
2278      //   - anonymous struct/union within a template
2279      //   - unnamed class/struct/union/enum within a template
2280      //
2281      // FIXME: Find a better way to find these instantiations!
2282      Result = findInstantiationOf(Context, D,
2283                                   ParentDC->decls_begin(),
2284                                   ParentDC->decls_end());
2285    }
2286
2287    // UsingShadowDecls can instantiate to nothing because of using hiding.
2288    assert((Result || isa<UsingShadowDecl>(D))
2289           && "Unable to find instantiation of declaration!");
2290
2291    D = Result;
2292  }
2293
2294  return D;
2295}
2296
2297/// \brief Performs template instantiation for all implicit template
2298/// instantiations we have seen until this point.
2299void Sema::PerformPendingImplicitInstantiations(bool LocalOnly) {
2300  while (!PendingLocalImplicitInstantiations.empty() ||
2301         (!LocalOnly && !PendingImplicitInstantiations.empty())) {
2302    PendingImplicitInstantiation Inst;
2303
2304    if (PendingLocalImplicitInstantiations.empty()) {
2305      Inst = PendingImplicitInstantiations.front();
2306      PendingImplicitInstantiations.pop_front();
2307    } else {
2308      Inst = PendingLocalImplicitInstantiations.front();
2309      PendingLocalImplicitInstantiations.pop_front();
2310    }
2311
2312    // Instantiate function definitions
2313    if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
2314      PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function),
2315                                            Function->getLocation(), *this,
2316                                            Context.getSourceManager(),
2317                                           "instantiating function definition");
2318
2319      if (!Function->getBody())
2320        InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true);
2321      continue;
2322    }
2323
2324    // Instantiate static data member definitions.
2325    VarDecl *Var = cast<VarDecl>(Inst.first);
2326    assert(Var->isStaticDataMember() && "Not a static data member?");
2327
2328    PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var),
2329                                          Var->getLocation(), *this,
2330                                          Context.getSourceManager(),
2331                                          "instantiating static data member "
2332                                          "definition");
2333
2334    InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true);
2335  }
2336}
2337