SemaTemplateInstantiateDecl.cpp revision c7da5165e6976a8202b4bcaaf2139adb230a7e6e 
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  SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration);
221
222  if (D->isOutOfLine()) {
223    D->getLexicalDeclContext()->addDecl(Var);
224    Owner->makeDeclVisibleInContext(Var);
225  } else {
226    Owner->addDecl(Var);
227  }
228
229  // Link instantiations of static data members back to the template from
230  // which they were instantiated.
231  if (Var->isStaticDataMember())
232    SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D,
233                                                     TSK_ImplicitInstantiation);
234
235  if (D->getInit()) {
236    if (Var->isStaticDataMember() && !D->isOutOfLine())
237      SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated);
238    else
239      SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
240
241    // Extract the initializer, skipping through any temporary-binding
242    // expressions and look at the subexpression as it was written.
243    Expr *DInit = D->getInit();
244    if (CXXExprWithTemporaries *ExprTemp
245          = dyn_cast<CXXExprWithTemporaries>(DInit))
246      DInit = ExprTemp->getSubExpr();
247    while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(DInit))
248      DInit = Binder->getSubExpr();
249    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(DInit))
250      DInit = ICE->getSubExprAsWritten();
251
252    if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(DInit)) {
253      // The initializer is a parenthesized list of expressions that is
254      // type-dependent. Instantiate each of the expressions; we'll be
255      // performing direct initialization with them.
256      llvm::SmallVector<SourceLocation, 4> CommaLocs;
257      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
258      if (!InstantiateInitializationArguments(SemaRef,
259                                              PLE->getExprs(),
260                                              PLE->getNumExprs(),
261                                              TemplateArgs,
262                                              CommaLocs, InitArgs)) {
263        // Add the direct initializer to the declaration.
264        SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
265                                              PLE->getLParenLoc(),
266                                              move_arg(InitArgs),
267                                              CommaLocs.data(),
268                                              PLE->getRParenLoc());
269      }
270    } else if (CXXConstructExpr *Construct =dyn_cast<CXXConstructExpr>(DInit)) {
271      // The initializer resolved to a constructor. Instantiate the constructor
272      // arguments.
273      llvm::SmallVector<SourceLocation, 4> CommaLocs;
274      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
275
276      if (!InstantiateInitializationArguments(SemaRef,
277                                              Construct->getArgs(),
278                                              Construct->getNumArgs(),
279                                              TemplateArgs,
280                                              CommaLocs, InitArgs)) {
281        if (D->hasCXXDirectInitializer()) {
282          SourceLocation FakeLParenLoc =
283            SemaRef.PP.getLocForEndOfToken(D->getLocation());
284          SourceLocation FakeRParenLoc = CommaLocs.empty()? FakeLParenLoc
285                                                          : CommaLocs.back();
286          SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
287                                                FakeLParenLoc,
288                                                move_arg(InitArgs),
289                                                CommaLocs.data(),
290                                                FakeRParenLoc);
291        } else if (InitArgs.size() == 1) {
292          Expr *Init = (Expr*)(InitArgs.take()[0]);
293          SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var),
294                                       SemaRef.Owned(Init),
295                                       false);
296        } else {
297          assert(InitArgs.size() == 0);
298          SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
299        }
300      }
301    } else {
302      OwningExprResult Init
303        = SemaRef.SubstExpr(D->getInit(), TemplateArgs);
304
305      // FIXME: Not happy about invalidating decls just because of a bad
306      // initializer, unless it affects the type.
307      if (Init.isInvalid())
308        Var->setInvalidDecl();
309      else
310        SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
311                                     D->hasCXXDirectInitializer());
312    }
313
314    SemaRef.PopExpressionEvaluationContext();
315  } else if (!Var->isStaticDataMember() || Var->isOutOfLine())
316    SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
317
318  return Var;
319}
320
321Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
322  bool Invalid = false;
323  TypeSourceInfo *DI = D->getTypeSourceInfo();
324  if (DI->getType()->isDependentType())  {
325    DI = SemaRef.SubstType(DI, TemplateArgs,
326                           D->getLocation(), D->getDeclName());
327    if (!DI) {
328      DI = D->getTypeSourceInfo();
329      Invalid = true;
330    } else if (DI->getType()->isFunctionType()) {
331      // C++ [temp.arg.type]p3:
332      //   If a declaration acquires a function type through a type
333      //   dependent on a template-parameter and this causes a
334      //   declaration that does not use the syntactic form of a
335      //   function declarator to have function type, the program is
336      //   ill-formed.
337      SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
338        << DI->getType();
339      Invalid = true;
340    }
341  }
342
343  Expr *BitWidth = D->getBitWidth();
344  if (Invalid)
345    BitWidth = 0;
346  else if (BitWidth) {
347    // The bit-width expression is not potentially evaluated.
348    EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
349
350    OwningExprResult InstantiatedBitWidth
351      = SemaRef.SubstExpr(BitWidth, TemplateArgs);
352    if (InstantiatedBitWidth.isInvalid()) {
353      Invalid = true;
354      BitWidth = 0;
355    } else
356      BitWidth = InstantiatedBitWidth.takeAs<Expr>();
357  }
358
359  FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(),
360                                            DI->getType(), DI,
361                                            cast<RecordDecl>(Owner),
362                                            D->getLocation(),
363                                            D->isMutable(),
364                                            BitWidth,
365                                            D->getTypeSpecStartLoc(),
366                                            D->getAccess(),
367                                            0);
368  if (!Field) {
369    cast<Decl>(Owner)->setInvalidDecl();
370    return 0;
371  }
372
373  InstantiateAttrs(D, Field);
374
375  if (Invalid)
376    Field->setInvalidDecl();
377
378  if (!Field->getDeclName()) {
379    // Keep track of where this decl came from.
380    SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D);
381  }
382
383  Field->setImplicit(D->isImplicit());
384  Field->setAccess(D->getAccess());
385  Owner->addDecl(Field);
386
387  return Field;
388}
389
390Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) {
391  FriendDecl::FriendUnion FU;
392
393  // Handle friend type expressions by simply substituting template
394  // parameters into the pattern type.
395  if (Type *Ty = D->getFriendType()) {
396    QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs,
397                                   D->getLocation(), DeclarationName());
398    if (T.isNull()) return 0;
399
400    assert(getLangOptions().CPlusPlus0x || T->isRecordType());
401    FU = T.getTypePtr();
402
403  // Handle everything else by appropriate substitution.
404  } else {
405    NamedDecl *ND = D->getFriendDecl();
406    assert(ND && "friend decl must be a decl or a type!");
407
408    // FIXME: We have a problem here, because the nested call to Visit(ND)
409    // will inject the thing that the friend references into the current
410    // owner, which is wrong.
411    Decl *NewND;
412
413    // Hack to make this work almost well pending a rewrite.
414    if (ND->getDeclContext()->isRecord())
415      NewND = SemaRef.FindInstantiatedDecl(ND, TemplateArgs);
416    else if (D->wasSpecialization()) {
417      // Totally egregious hack to work around PR5866
418      return 0;
419    } else
420      NewND = Visit(ND);
421    if (!NewND) return 0;
422
423    FU = cast<NamedDecl>(NewND);
424  }
425
426  FriendDecl *FD =
427    FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU,
428                       D->getFriendLoc());
429  FD->setAccess(AS_public);
430  Owner->addDecl(FD);
431  return FD;
432}
433
434Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
435  Expr *AssertExpr = D->getAssertExpr();
436
437  // The expression in a static assertion is not potentially evaluated.
438  EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
439
440  OwningExprResult InstantiatedAssertExpr
441    = SemaRef.SubstExpr(AssertExpr, TemplateArgs);
442  if (InstantiatedAssertExpr.isInvalid())
443    return 0;
444
445  OwningExprResult Message(SemaRef, D->getMessage());
446  D->getMessage()->Retain();
447  Decl *StaticAssert
448    = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
449                                           move(InstantiatedAssertExpr),
450                                           move(Message)).getAs<Decl>();
451  return StaticAssert;
452}
453
454Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
455  EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner,
456                                    D->getLocation(), D->getIdentifier(),
457                                    D->getTagKeywordLoc(),
458                                    /*PrevDecl=*/0);
459  Enum->setInstantiationOfMemberEnum(D);
460  Enum->setAccess(D->getAccess());
461  Owner->addDecl(Enum);
462  Enum->startDefinition();
463
464  llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators;
465
466  EnumConstantDecl *LastEnumConst = 0;
467  for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
468         ECEnd = D->enumerator_end();
469       EC != ECEnd; ++EC) {
470    // The specified value for the enumerator.
471    OwningExprResult Value = SemaRef.Owned((Expr *)0);
472    if (Expr *UninstValue = EC->getInitExpr()) {
473      // The enumerator's value expression is not potentially evaluated.
474      EnterExpressionEvaluationContext Unevaluated(SemaRef,
475                                                   Action::Unevaluated);
476
477      Value = SemaRef.SubstExpr(UninstValue, TemplateArgs);
478    }
479
480    // Drop the initial value and continue.
481    bool isInvalid = false;
482    if (Value.isInvalid()) {
483      Value = SemaRef.Owned((Expr *)0);
484      isInvalid = true;
485    }
486
487    EnumConstantDecl *EnumConst
488      = SemaRef.CheckEnumConstant(Enum, LastEnumConst,
489                                  EC->getLocation(), EC->getIdentifier(),
490                                  move(Value));
491
492    if (isInvalid) {
493      if (EnumConst)
494        EnumConst->setInvalidDecl();
495      Enum->setInvalidDecl();
496    }
497
498    if (EnumConst) {
499      EnumConst->setAccess(Enum->getAccess());
500      Enum->addDecl(EnumConst);
501      Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst));
502      LastEnumConst = EnumConst;
503    }
504  }
505
506  // FIXME: Fixup LBraceLoc and RBraceLoc
507  // FIXME: Empty Scope and AttributeList (required to handle attribute packed).
508  SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(),
509                        Sema::DeclPtrTy::make(Enum),
510                        &Enumerators[0], Enumerators.size(),
511                        0, 0);
512
513  return Enum;
514}
515
516Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
517  assert(false && "EnumConstantDecls can only occur within EnumDecls.");
518  return 0;
519}
520
521namespace {
522  class SortDeclByLocation {
523    SourceManager &SourceMgr;
524
525  public:
526    explicit SortDeclByLocation(SourceManager &SourceMgr)
527      : SourceMgr(SourceMgr) { }
528
529    bool operator()(const Decl *X, const Decl *Y) const {
530      return SourceMgr.isBeforeInTranslationUnit(X->getLocation(),
531                                                 Y->getLocation());
532    }
533  };
534}
535
536Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
537  // Create a local instantiation scope for this class template, which
538  // will contain the instantiations of the template parameters.
539  Sema::LocalInstantiationScope Scope(SemaRef);
540  TemplateParameterList *TempParams = D->getTemplateParameters();
541  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
542  if (!InstParams)
543    return NULL;
544
545  CXXRecordDecl *Pattern = D->getTemplatedDecl();
546  CXXRecordDecl *RecordInst
547    = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner,
548                            Pattern->getLocation(), Pattern->getIdentifier(),
549                            Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL,
550                            /*DelayTypeCreation=*/true);
551
552  ClassTemplateDecl *Inst
553    = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(),
554                                D->getIdentifier(), InstParams, RecordInst, 0);
555  RecordInst->setDescribedClassTemplate(Inst);
556  if (D->getFriendObjectKind())
557    Inst->setObjectOfFriendDecl(true);
558  else
559    Inst->setAccess(D->getAccess());
560  Inst->setInstantiatedFromMemberTemplate(D);
561
562  // Trigger creation of the type for the instantiation.
563  SemaRef.Context.getTypeDeclType(RecordInst);
564
565  // Finish handling of friends.
566  if (Inst->getFriendObjectKind()) {
567    return Inst;
568  }
569
570  Inst->setAccess(D->getAccess());
571  Owner->addDecl(Inst);
572
573  // First, we sort the partial specializations by location, so
574  // that we instantiate them in the order they were declared.
575  llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
576  for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator
577         P = D->getPartialSpecializations().begin(),
578         PEnd = D->getPartialSpecializations().end();
579       P != PEnd; ++P)
580    PartialSpecs.push_back(&*P);
581  std::sort(PartialSpecs.begin(), PartialSpecs.end(),
582            SortDeclByLocation(SemaRef.SourceMgr));
583
584  // Instantiate all of the partial specializations of this member class
585  // template.
586  for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
587    InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]);
588
589  return Inst;
590}
591
592Decl *
593TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl(
594                                   ClassTemplatePartialSpecializationDecl *D) {
595  ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
596
597  // Lookup the already-instantiated declaration in the instantiation
598  // of the class template and return that.
599  DeclContext::lookup_result Found
600    = Owner->lookup(ClassTemplate->getDeclName());
601  if (Found.first == Found.second)
602    return 0;
603
604  ClassTemplateDecl *InstClassTemplate
605    = dyn_cast<ClassTemplateDecl>(*Found.first);
606  if (!InstClassTemplate)
607    return 0;
608
609  Decl *DCanon = D->getCanonicalDecl();
610  for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator
611            P = InstClassTemplate->getPartialSpecializations().begin(),
612         PEnd = InstClassTemplate->getPartialSpecializations().end();
613       P != PEnd; ++P) {
614    if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
615      return &*P;
616  }
617
618  return 0;
619}
620
621Decl *
622TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
623  // Create a local instantiation scope for this function template, which
624  // will contain the instantiations of the template parameters and then get
625  // merged with the local instantiation scope for the function template
626  // itself.
627  Sema::LocalInstantiationScope Scope(SemaRef);
628
629  TemplateParameterList *TempParams = D->getTemplateParameters();
630  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
631  if (!InstParams)
632    return NULL;
633
634  FunctionDecl *Instantiated = 0;
635  if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl()))
636    Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod,
637                                                                 InstParams));
638  else
639    Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl(
640                                                          D->getTemplatedDecl(),
641                                                                InstParams));
642
643  if (!Instantiated)
644    return 0;
645
646  Instantiated->setAccess(D->getAccess());
647
648  // Link the instantiated function template declaration to the function
649  // template from which it was instantiated.
650  FunctionTemplateDecl *InstTemplate
651    = Instantiated->getDescribedFunctionTemplate();
652  InstTemplate->setAccess(D->getAccess());
653  assert(InstTemplate &&
654         "VisitFunctionDecl/CXXMethodDecl didn't create a template!");
655
656  // Link the instantiation back to the pattern *unless* this is a
657  // non-definition friend declaration.
658  if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
659      !(InstTemplate->getFriendObjectKind() &&
660        !D->getTemplatedDecl()->isThisDeclarationADefinition()))
661    InstTemplate->setInstantiatedFromMemberTemplate(D);
662
663  // Add non-friends into the owner.
664  if (!InstTemplate->getFriendObjectKind())
665    Owner->addDecl(InstTemplate);
666  return InstTemplate;
667}
668
669Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
670  CXXRecordDecl *PrevDecl = 0;
671  if (D->isInjectedClassName())
672    PrevDecl = cast<CXXRecordDecl>(Owner);
673  else if (D->getPreviousDeclaration()) {
674    NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getPreviousDeclaration(),
675                                                   TemplateArgs);
676    if (!Prev) return 0;
677    PrevDecl = cast<CXXRecordDecl>(Prev);
678  }
679
680  CXXRecordDecl *Record
681    = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
682                            D->getLocation(), D->getIdentifier(),
683                            D->getTagKeywordLoc(), PrevDecl);
684  Record->setImplicit(D->isImplicit());
685  // FIXME: Check against AS_none is an ugly hack to work around the issue that
686  // the tag decls introduced by friend class declarations don't have an access
687  // specifier. Remove once this area of the code gets sorted out.
688  if (D->getAccess() != AS_none)
689    Record->setAccess(D->getAccess());
690  if (!D->isInjectedClassName())
691    Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
692
693  // If the original function was part of a friend declaration,
694  // inherit its namespace state.
695  if (Decl::FriendObjectKind FOK = D->getFriendObjectKind())
696    Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared);
697
698  Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion());
699
700  Owner->addDecl(Record);
701  return Record;
702}
703
704/// Normal class members are of more specific types and therefore
705/// don't make it here.  This function serves two purposes:
706///   1) instantiating function templates
707///   2) substituting friend declarations
708/// FIXME: preserve function definitions in case #2
709Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
710                                       TemplateParameterList *TemplateParams) {
711  // Check whether there is already a function template specialization for
712  // this declaration.
713  FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
714  void *InsertPos = 0;
715  if (FunctionTemplate && !TemplateParams) {
716    llvm::FoldingSetNodeID ID;
717    FunctionTemplateSpecializationInfo::Profile(ID,
718                             TemplateArgs.getInnermost().getFlatArgumentList(),
719                                       TemplateArgs.getInnermost().flat_size(),
720                                                SemaRef.Context);
721
722    FunctionTemplateSpecializationInfo *Info
723      = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
724                                                                   InsertPos);
725
726    // If we already have a function template specialization, return it.
727    if (Info)
728      return Info->Function;
729  }
730
731  bool MergeWithParentScope = (TemplateParams != 0) ||
732    !(isa<Decl>(Owner) &&
733      cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
734  Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
735
736  llvm::SmallVector<ParmVarDecl *, 4> Params;
737  QualType T = SubstFunctionType(D, Params);
738  if (T.isNull())
739    return 0;
740
741  // If we're instantiating a local function declaration, put the result
742  // in the owner;  otherwise we need to find the instantiated context.
743  DeclContext *DC;
744  if (D->getDeclContext()->isFunctionOrMethod())
745    DC = Owner;
746  else
747    DC = SemaRef.FindInstantiatedContext(D->getDeclContext(), TemplateArgs);
748
749  FunctionDecl *Function =
750      FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(),
751                           D->getDeclName(), T, D->getTypeSourceInfo(),
752                           D->getStorageClass(),
753                           D->isInlineSpecified(), D->hasWrittenPrototype());
754  Function->setLexicalDeclContext(Owner);
755
756  // Attach the parameters
757  for (unsigned P = 0; P < Params.size(); ++P)
758    Params[P]->setOwningFunction(Function);
759  Function->setParams(SemaRef.Context, Params.data(), Params.size());
760
761  if (TemplateParams) {
762    // Our resulting instantiation is actually a function template, since we
763    // are substituting only the outer template parameters. For example, given
764    //
765    //   template<typename T>
766    //   struct X {
767    //     template<typename U> friend void f(T, U);
768    //   };
769    //
770    //   X<int> x;
771    //
772    // We are instantiating the friend function template "f" within X<int>,
773    // which means substituting int for T, but leaving "f" as a friend function
774    // template.
775    // Build the function template itself.
776    FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Owner,
777                                                    Function->getLocation(),
778                                                    Function->getDeclName(),
779                                                    TemplateParams, Function);
780    Function->setDescribedFunctionTemplate(FunctionTemplate);
781    FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
782  } else if (FunctionTemplate) {
783    // Record this function template specialization.
784    Function->setFunctionTemplateSpecialization(SemaRef.Context,
785                                                FunctionTemplate,
786                                                &TemplateArgs.getInnermost(),
787                                                InsertPos);
788  }
789
790  if (InitFunctionInstantiation(Function, D))
791    Function->setInvalidDecl();
792
793  bool Redeclaration = false;
794  bool OverloadableAttrRequired = false;
795
796  LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(),
797                        Sema::LookupOrdinaryName, Sema::ForRedeclaration);
798
799  if (TemplateParams || !FunctionTemplate) {
800    // Look only into the namespace where the friend would be declared to
801    // find a previous declaration. This is the innermost enclosing namespace,
802    // as described in ActOnFriendFunctionDecl.
803    SemaRef.LookupQualifiedName(Previous, DC);
804
805    // In C++, the previous declaration we find might be a tag type
806    // (class or enum). In this case, the new declaration will hide the
807    // tag type. Note that this does does not apply if we're declaring a
808    // typedef (C++ [dcl.typedef]p4).
809    if (Previous.isSingleTagDecl())
810      Previous.clear();
811  }
812
813  SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous,
814                                   false, Redeclaration,
815                                   /*FIXME:*/OverloadableAttrRequired);
816
817  // If the original function was part of a friend declaration,
818  // inherit its namespace state and add it to the owner.
819  NamedDecl *FromFriendD
820      = TemplateParams? cast<NamedDecl>(D->getDescribedFunctionTemplate()) : D;
821  if (FromFriendD->getFriendObjectKind()) {
822    NamedDecl *ToFriendD = 0;
823    NamedDecl *PrevDecl;
824    if (TemplateParams) {
825      ToFriendD = cast<NamedDecl>(FunctionTemplate);
826      PrevDecl = FunctionTemplate->getPreviousDeclaration();
827    } else {
828      ToFriendD = Function;
829      PrevDecl = Function->getPreviousDeclaration();
830    }
831    ToFriendD->setObjectOfFriendDecl(PrevDecl != NULL);
832    if (!Owner->isDependentContext() && !PrevDecl)
833      DC->makeDeclVisibleInContext(ToFriendD, /* Recoverable = */ false);
834
835    if (!TemplateParams)
836      Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
837  }
838
839  return Function;
840}
841
842Decl *
843TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
844                                      TemplateParameterList *TemplateParams) {
845  FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
846  void *InsertPos = 0;
847  if (FunctionTemplate && !TemplateParams) {
848    // We are creating a function template specialization from a function
849    // template. Check whether there is already a function template
850    // specialization for this particular set of template arguments.
851    llvm::FoldingSetNodeID ID;
852    FunctionTemplateSpecializationInfo::Profile(ID,
853                            TemplateArgs.getInnermost().getFlatArgumentList(),
854                                      TemplateArgs.getInnermost().flat_size(),
855                                                SemaRef.Context);
856
857    FunctionTemplateSpecializationInfo *Info
858      = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
859                                                                   InsertPos);
860
861    // If we already have a function template specialization, return it.
862    if (Info)
863      return Info->Function;
864  }
865
866  bool MergeWithParentScope = (TemplateParams != 0) ||
867    !(isa<Decl>(Owner) &&
868      cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
869  Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
870
871  llvm::SmallVector<ParmVarDecl *, 4> Params;
872  QualType T = SubstFunctionType(D, Params);
873  if (T.isNull())
874    return 0;
875
876  // Build the instantiated method declaration.
877  CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
878  CXXMethodDecl *Method = 0;
879
880  DeclarationName Name = D->getDeclName();
881  if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
882    QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
883    Name = SemaRef.Context.DeclarationNames.getCXXConstructorName(
884                                    SemaRef.Context.getCanonicalType(ClassTy));
885    Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
886                                        Constructor->getLocation(),
887                                        Name, T,
888                                        Constructor->getTypeSourceInfo(),
889                                        Constructor->isExplicit(),
890                                        Constructor->isInlineSpecified(), false);
891  } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
892    QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
893    Name = SemaRef.Context.DeclarationNames.getCXXDestructorName(
894                                   SemaRef.Context.getCanonicalType(ClassTy));
895    Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
896                                       Destructor->getLocation(), Name,
897                                       T, Destructor->isInlineSpecified(), false);
898  } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
899    CanQualType ConvTy
900      = SemaRef.Context.getCanonicalType(
901                                      T->getAs<FunctionType>()->getResultType());
902    Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName(
903                                                                      ConvTy);
904    Method = CXXConversionDecl::Create(SemaRef.Context, Record,
905                                       Conversion->getLocation(), Name,
906                                       T, Conversion->getTypeSourceInfo(),
907                                       Conversion->isInlineSpecified(),
908                                       Conversion->isExplicit());
909  } else {
910    Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(),
911                                   D->getDeclName(), T, D->getTypeSourceInfo(),
912                                   D->isStatic(), D->isInlineSpecified());
913  }
914
915  if (TemplateParams) {
916    // Our resulting instantiation is actually a function template, since we
917    // are substituting only the outer template parameters. For example, given
918    //
919    //   template<typename T>
920    //   struct X {
921    //     template<typename U> void f(T, U);
922    //   };
923    //
924    //   X<int> x;
925    //
926    // We are instantiating the member template "f" within X<int>, which means
927    // substituting int for T, but leaving "f" as a member function template.
928    // Build the function template itself.
929    FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record,
930                                                    Method->getLocation(),
931                                                    Method->getDeclName(),
932                                                    TemplateParams, Method);
933    if (D->isOutOfLine())
934      FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
935    Method->setDescribedFunctionTemplate(FunctionTemplate);
936  } else if (FunctionTemplate) {
937    // Record this function template specialization.
938    Method->setFunctionTemplateSpecialization(SemaRef.Context,
939                                              FunctionTemplate,
940                                              &TemplateArgs.getInnermost(),
941                                              InsertPos);
942  } else {
943    // Record that this is an instantiation of a member function.
944    Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
945  }
946
947  // If we are instantiating a member function defined
948  // out-of-line, the instantiation will have the same lexical
949  // context (which will be a namespace scope) as the template.
950  if (D->isOutOfLine())
951    Method->setLexicalDeclContext(D->getLexicalDeclContext());
952
953  // Attach the parameters
954  for (unsigned P = 0; P < Params.size(); ++P)
955    Params[P]->setOwningFunction(Method);
956  Method->setParams(SemaRef.Context, Params.data(), Params.size());
957
958  if (InitMethodInstantiation(Method, D))
959    Method->setInvalidDecl();
960
961  LookupResult Previous(SemaRef, Name, SourceLocation(),
962                        Sema::LookupOrdinaryName, Sema::ForRedeclaration);
963
964  if (!FunctionTemplate || TemplateParams) {
965    SemaRef.LookupQualifiedName(Previous, Owner);
966
967    // In C++, the previous declaration we find might be a tag type
968    // (class or enum). In this case, the new declaration will hide the
969    // tag type. Note that this does does not apply if we're declaring a
970    // typedef (C++ [dcl.typedef]p4).
971    if (Previous.isSingleTagDecl())
972      Previous.clear();
973  }
974
975  bool Redeclaration = false;
976  bool OverloadableAttrRequired = false;
977  SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration,
978                                   /*FIXME:*/OverloadableAttrRequired);
979
980  if (D->isPure())
981    SemaRef.CheckPureMethod(Method, SourceRange());
982
983  Method->setAccess(D->getAccess());
984
985  if (!FunctionTemplate && (!Method->isInvalidDecl() || Previous.empty()) &&
986      !Method->getFriendObjectKind())
987    Owner->addDecl(Method);
988
989  return Method;
990}
991
992Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
993  return VisitCXXMethodDecl(D);
994}
995
996Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
997  return VisitCXXMethodDecl(D);
998}
999
1000Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
1001  return VisitCXXMethodDecl(D);
1002}
1003
1004ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
1005  QualType T;
1006  TypeSourceInfo *DI = D->getTypeSourceInfo();
1007  if (DI) {
1008    DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
1009                           D->getDeclName());
1010    if (DI) T = DI->getType();
1011  } else {
1012    T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(),
1013                          D->getDeclName());
1014    DI = 0;
1015  }
1016
1017  if (T.isNull())
1018    return 0;
1019
1020  T = SemaRef.adjustParameterType(T);
1021
1022  // Allocate the parameter
1023  ParmVarDecl *Param
1024    = ParmVarDecl::Create(SemaRef.Context,
1025                          SemaRef.Context.getTranslationUnitDecl(),
1026                          D->getLocation(),
1027                          D->getIdentifier(), T, DI, D->getStorageClass(), 0);
1028
1029  // Mark the default argument as being uninstantiated.
1030  if (D->hasUninstantiatedDefaultArg())
1031    Param->setUninstantiatedDefaultArg(D->getUninstantiatedDefaultArg());
1032  else if (Expr *Arg = D->getDefaultArg())
1033    Param->setUninstantiatedDefaultArg(Arg);
1034
1035  // Note: we don't try to instantiate function parameters until after
1036  // we've instantiated the function's type. Therefore, we don't have
1037  // to check for 'void' parameter types here.
1038  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1039  return Param;
1040}
1041
1042Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
1043                                                    TemplateTypeParmDecl *D) {
1044  // TODO: don't always clone when decls are refcounted.
1045  const Type* T = D->getTypeForDecl();
1046  assert(T->isTemplateTypeParmType());
1047  const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>();
1048
1049  TemplateTypeParmDecl *Inst =
1050    TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1051                                 TTPT->getDepth() - 1, TTPT->getIndex(),
1052                                 TTPT->getName(),
1053                                 D->wasDeclaredWithTypename(),
1054                                 D->isParameterPack());
1055
1056  if (D->hasDefaultArgument())
1057    Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false);
1058
1059  // Introduce this template parameter's instantiation into the instantiation
1060  // scope.
1061  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst);
1062
1063  return Inst;
1064}
1065
1066Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
1067                                                 NonTypeTemplateParmDecl *D) {
1068  // Substitute into the type of the non-type template parameter.
1069  QualType T;
1070  TypeSourceInfo *DI = D->getTypeSourceInfo();
1071  if (DI) {
1072    DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
1073                           D->getDeclName());
1074    if (DI) T = DI->getType();
1075  } else {
1076    T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(),
1077                          D->getDeclName());
1078    DI = 0;
1079  }
1080  if (T.isNull())
1081    return 0;
1082
1083  // Check that this type is acceptable for a non-type template parameter.
1084  bool Invalid = false;
1085  T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation());
1086  if (T.isNull()) {
1087    T = SemaRef.Context.IntTy;
1088    Invalid = true;
1089  }
1090
1091  NonTypeTemplateParmDecl *Param
1092    = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1093                                      D->getDepth() - 1, D->getPosition(),
1094                                      D->getIdentifier(), T, DI);
1095  if (Invalid)
1096    Param->setInvalidDecl();
1097
1098  Param->setDefaultArgument(D->getDefaultArgument());
1099
1100  // Introduce this template parameter's instantiation into the instantiation
1101  // scope.
1102  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1103  return Param;
1104}
1105
1106Decl *
1107TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
1108                                                  TemplateTemplateParmDecl *D) {
1109  // Instantiate the template parameter list of the template template parameter.
1110  TemplateParameterList *TempParams = D->getTemplateParameters();
1111  TemplateParameterList *InstParams;
1112  {
1113    // Perform the actual substitution of template parameters within a new,
1114    // local instantiation scope.
1115    Sema::LocalInstantiationScope Scope(SemaRef);
1116    InstParams = SubstTemplateParams(TempParams);
1117    if (!InstParams)
1118      return NULL;
1119  }
1120
1121  // Build the template template parameter.
1122  TemplateTemplateParmDecl *Param
1123    = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1124                                       D->getDepth() - 1, D->getPosition(),
1125                                       D->getIdentifier(), InstParams);
1126  Param->setDefaultArgument(D->getDefaultArgument());
1127
1128  // Introduce this template parameter's instantiation into the instantiation
1129  // scope.
1130  SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
1131
1132  return Param;
1133}
1134
1135Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1136  // Using directives are never dependent, so they require no explicit
1137
1138  UsingDirectiveDecl *Inst
1139    = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(),
1140                                 D->getNamespaceKeyLocation(),
1141                                 D->getQualifierRange(), D->getQualifier(),
1142                                 D->getIdentLocation(),
1143                                 D->getNominatedNamespace(),
1144                                 D->getCommonAncestor());
1145  Owner->addDecl(Inst);
1146  return Inst;
1147}
1148
1149Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
1150  // The nested name specifier is non-dependent, so no transformation
1151  // is required.
1152
1153  // We only need to do redeclaration lookups if we're in a class
1154  // scope (in fact, it's not really even possible in non-class
1155  // scopes).
1156  bool CheckRedeclaration = Owner->isRecord();
1157
1158  LookupResult Prev(SemaRef, D->getDeclName(), D->getLocation(),
1159                    Sema::LookupUsingDeclName, Sema::ForRedeclaration);
1160
1161  UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
1162                                       D->getLocation(),
1163                                       D->getNestedNameRange(),
1164                                       D->getUsingLocation(),
1165                                       D->getTargetNestedNameDecl(),
1166                                       D->getDeclName(),
1167                                       D->isTypeName());
1168
1169  CXXScopeSpec SS;
1170  SS.setScopeRep(D->getTargetNestedNameDecl());
1171  SS.setRange(D->getNestedNameRange());
1172
1173  if (CheckRedeclaration) {
1174    Prev.setHideTags(false);
1175    SemaRef.LookupQualifiedName(Prev, Owner);
1176
1177    // Check for invalid redeclarations.
1178    if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(),
1179                                            D->isTypeName(), SS,
1180                                            D->getLocation(), Prev))
1181      NewUD->setInvalidDecl();
1182
1183  }
1184
1185  if (!NewUD->isInvalidDecl() &&
1186      SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS,
1187                                      D->getLocation()))
1188    NewUD->setInvalidDecl();
1189
1190  SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
1191  NewUD->setAccess(D->getAccess());
1192  Owner->addDecl(NewUD);
1193
1194  // Don't process the shadow decls for an invalid decl.
1195  if (NewUD->isInvalidDecl())
1196    return NewUD;
1197
1198  bool isFunctionScope = Owner->isFunctionOrMethod();
1199
1200  // Process the shadow decls.
1201  for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end();
1202         I != E; ++I) {
1203    UsingShadowDecl *Shadow = *I;
1204    NamedDecl *InstTarget =
1205      cast<NamedDecl>(SemaRef.FindInstantiatedDecl(Shadow->getTargetDecl(),
1206                                                   TemplateArgs));
1207
1208    if (CheckRedeclaration &&
1209        SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev))
1210      continue;
1211
1212    UsingShadowDecl *InstShadow
1213      = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget);
1214    SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
1215
1216    if (isFunctionScope)
1217      SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow);
1218  }
1219
1220  return NewUD;
1221}
1222
1223Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
1224  // Ignore these;  we handle them in bulk when processing the UsingDecl.
1225  return 0;
1226}
1227
1228Decl * TemplateDeclInstantiator
1229    ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1230  NestedNameSpecifier *NNS =
1231    SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
1232                                     D->getTargetNestedNameRange(),
1233                                     TemplateArgs);
1234  if (!NNS)
1235    return 0;
1236
1237  CXXScopeSpec SS;
1238  SS.setRange(D->getTargetNestedNameRange());
1239  SS.setScopeRep(NNS);
1240
1241  NamedDecl *UD =
1242    SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
1243                                  D->getUsingLoc(), SS, D->getLocation(),
1244                                  D->getDeclName(), 0,
1245                                  /*instantiation*/ true,
1246                                  /*typename*/ true, D->getTypenameLoc());
1247  if (UD)
1248    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
1249
1250  return UD;
1251}
1252
1253Decl * TemplateDeclInstantiator
1254    ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1255  NestedNameSpecifier *NNS =
1256    SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
1257                                     D->getTargetNestedNameRange(),
1258                                     TemplateArgs);
1259  if (!NNS)
1260    return 0;
1261
1262  CXXScopeSpec SS;
1263  SS.setRange(D->getTargetNestedNameRange());
1264  SS.setScopeRep(NNS);
1265
1266  NamedDecl *UD =
1267    SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
1268                                  D->getUsingLoc(), SS, D->getLocation(),
1269                                  D->getDeclName(), 0,
1270                                  /*instantiation*/ true,
1271                                  /*typename*/ false, SourceLocation());
1272  if (UD)
1273    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
1274
1275  return UD;
1276}
1277
1278Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner,
1279                      const MultiLevelTemplateArgumentList &TemplateArgs) {
1280  TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
1281  return Instantiator.Visit(D);
1282}
1283
1284/// \brief Instantiates a nested template parameter list in the current
1285/// instantiation context.
1286///
1287/// \param L The parameter list to instantiate
1288///
1289/// \returns NULL if there was an error
1290TemplateParameterList *
1291TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) {
1292  // Get errors for all the parameters before bailing out.
1293  bool Invalid = false;
1294
1295  unsigned N = L->size();
1296  typedef llvm::SmallVector<NamedDecl *, 8> ParamVector;
1297  ParamVector Params;
1298  Params.reserve(N);
1299  for (TemplateParameterList::iterator PI = L->begin(), PE = L->end();
1300       PI != PE; ++PI) {
1301    NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI));
1302    Params.push_back(D);
1303    Invalid = Invalid || !D || D->isInvalidDecl();
1304  }
1305
1306  // Clean up if we had an error.
1307  if (Invalid) {
1308    for (ParamVector::iterator PI = Params.begin(), PE = Params.end();
1309         PI != PE; ++PI)
1310      if (*PI)
1311        (*PI)->Destroy(SemaRef.Context);
1312    return NULL;
1313  }
1314
1315  TemplateParameterList *InstL
1316    = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
1317                                    L->getLAngleLoc(), &Params.front(), N,
1318                                    L->getRAngleLoc());
1319  return InstL;
1320}
1321
1322/// \brief Instantiate the declaration of a class template partial
1323/// specialization.
1324///
1325/// \param ClassTemplate the (instantiated) class template that is partially
1326// specialized by the instantiation of \p PartialSpec.
1327///
1328/// \param PartialSpec the (uninstantiated) class template partial
1329/// specialization that we are instantiating.
1330///
1331/// \returns true if there was an error, false otherwise.
1332bool
1333TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(
1334                                            ClassTemplateDecl *ClassTemplate,
1335                          ClassTemplatePartialSpecializationDecl *PartialSpec) {
1336  // Create a local instantiation scope for this class template partial
1337  // specialization, which will contain the instantiations of the template
1338  // parameters.
1339  Sema::LocalInstantiationScope Scope(SemaRef);
1340
1341  // Substitute into the template parameters of the class template partial
1342  // specialization.
1343  TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
1344  TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1345  if (!InstParams)
1346    return true;
1347
1348  // Substitute into the template arguments of the class template partial
1349  // specialization.
1350  const TemplateArgumentLoc *PartialSpecTemplateArgs
1351    = PartialSpec->getTemplateArgsAsWritten();
1352  unsigned N = PartialSpec->getNumTemplateArgsAsWritten();
1353
1354  TemplateArgumentListInfo InstTemplateArgs; // no angle locations
1355  for (unsigned I = 0; I != N; ++I) {
1356    TemplateArgumentLoc Loc;
1357    if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs))
1358      return true;
1359    InstTemplateArgs.addArgument(Loc);
1360  }
1361
1362
1363  // Check that the template argument list is well-formed for this
1364  // class template.
1365  TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(),
1366                                        InstTemplateArgs.size());
1367  if (SemaRef.CheckTemplateArgumentList(ClassTemplate,
1368                                        PartialSpec->getLocation(),
1369                                        InstTemplateArgs,
1370                                        false,
1371                                        Converted))
1372    return true;
1373
1374  // Figure out where to insert this class template partial specialization
1375  // in the member template's set of class template partial specializations.
1376  llvm::FoldingSetNodeID ID;
1377  ClassTemplatePartialSpecializationDecl::Profile(ID,
1378                                                  Converted.getFlatArguments(),
1379                                                  Converted.flatSize(),
1380                                                  SemaRef.Context);
1381  void *InsertPos = 0;
1382  ClassTemplateSpecializationDecl *PrevDecl
1383    = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID,
1384                                                                     InsertPos);
1385
1386  // Build the canonical type that describes the converted template
1387  // arguments of the class template partial specialization.
1388  QualType CanonType
1389    = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
1390                                                  Converted.getFlatArguments(),
1391                                                    Converted.flatSize());
1392
1393  // Build the fully-sugared type for this class template
1394  // specialization as the user wrote in the specialization
1395  // itself. This means that we'll pretty-print the type retrieved
1396  // from the specialization's declaration the way that the user
1397  // actually wrote the specialization, rather than formatting the
1398  // name based on the "canonical" representation used to store the
1399  // template arguments in the specialization.
1400  QualType WrittenTy
1401    = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
1402                                                    InstTemplateArgs,
1403                                                    CanonType);
1404
1405  if (PrevDecl) {
1406    // We've already seen a partial specialization with the same template
1407    // parameters and template arguments. This can happen, for example, when
1408    // substituting the outer template arguments ends up causing two
1409    // class template partial specializations of a member class template
1410    // to have identical forms, e.g.,
1411    //
1412    //   template<typename T, typename U>
1413    //   struct Outer {
1414    //     template<typename X, typename Y> struct Inner;
1415    //     template<typename Y> struct Inner<T, Y>;
1416    //     template<typename Y> struct Inner<U, Y>;
1417    //   };
1418    //
1419    //   Outer<int, int> outer; // error: the partial specializations of Inner
1420    //                          // have the same signature.
1421    SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared)
1422      << WrittenTy;
1423    SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here)
1424      << SemaRef.Context.getTypeDeclType(PrevDecl);
1425    return true;
1426  }
1427
1428
1429  // Create the class template partial specialization declaration.
1430  ClassTemplatePartialSpecializationDecl *InstPartialSpec
1431    = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, Owner,
1432                                                     PartialSpec->getLocation(),
1433                                                     InstParams,
1434                                                     ClassTemplate,
1435                                                     Converted,
1436                                                     InstTemplateArgs,
1437                                                     0);
1438  InstPartialSpec->setInstantiatedFromMember(PartialSpec);
1439  InstPartialSpec->setTypeAsWritten(WrittenTy);
1440
1441  // Add this partial specialization to the set of class template partial
1442  // specializations.
1443  ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec,
1444                                                        InsertPos);
1445  return false;
1446}
1447
1448/// \brief Does substitution on the type of the given function, including
1449/// all of the function parameters.
1450///
1451/// \param D The function whose type will be the basis of the substitution
1452///
1453/// \param Params the instantiated parameter declarations
1454
1455/// \returns the instantiated function's type if successful, a NULL
1456/// type if there was an error.
1457QualType
1458TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D,
1459                              llvm::SmallVectorImpl<ParmVarDecl *> &Params) {
1460  bool InvalidDecl = false;
1461
1462  // Substitute all of the function's formal parameter types.
1463  TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs);
1464  llvm::SmallVector<QualType, 4> ParamTys;
1465  for (FunctionDecl::param_iterator P = D->param_begin(),
1466                                 PEnd = D->param_end();
1467       P != PEnd; ++P) {
1468    if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) {
1469      if (PInst->getType()->isVoidType()) {
1470        SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type);
1471        PInst->setInvalidDecl();
1472      } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(),
1473                                                PInst->getType(),
1474                                                diag::err_abstract_type_in_decl,
1475                                                Sema::AbstractParamType))
1476        PInst->setInvalidDecl();
1477
1478      Params.push_back(PInst);
1479      ParamTys.push_back(PInst->getType());
1480
1481      if (PInst->isInvalidDecl())
1482        InvalidDecl = true;
1483    } else
1484      InvalidDecl = true;
1485  }
1486
1487  // FIXME: Deallocate dead declarations.
1488  if (InvalidDecl)
1489    return QualType();
1490
1491  const FunctionProtoType *Proto = D->getType()->getAs<FunctionProtoType>();
1492  assert(Proto && "Missing prototype?");
1493  QualType ResultType
1494    = SemaRef.SubstType(Proto->getResultType(), TemplateArgs,
1495                        D->getLocation(), D->getDeclName());
1496  if (ResultType.isNull())
1497    return QualType();
1498
1499  return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(),
1500                                   Proto->isVariadic(), Proto->getTypeQuals(),
1501                                   D->getLocation(), D->getDeclName());
1502}
1503
1504/// \brief Initializes the common fields of an instantiation function
1505/// declaration (New) from the corresponding fields of its template (Tmpl).
1506///
1507/// \returns true if there was an error
1508bool
1509TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
1510                                                    FunctionDecl *Tmpl) {
1511  if (Tmpl->isDeleted())
1512    New->setDeleted();
1513
1514  // If we are performing substituting explicitly-specified template arguments
1515  // or deduced template arguments into a function template and we reach this
1516  // point, we are now past the point where SFINAE applies and have committed
1517  // to keeping the new function template specialization. We therefore
1518  // convert the active template instantiation for the function template
1519  // into a template instantiation for this specific function template
1520  // specialization, which is not a SFINAE context, so that we diagnose any
1521  // further errors in the declaration itself.
1522  typedef Sema::ActiveTemplateInstantiation ActiveInstType;
1523  ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
1524  if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
1525      ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
1526    if (FunctionTemplateDecl *FunTmpl
1527          = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) {
1528      assert(FunTmpl->getTemplatedDecl() == Tmpl &&
1529             "Deduction from the wrong function template?");
1530      (void) FunTmpl;
1531      ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
1532      ActiveInst.Entity = reinterpret_cast<uintptr_t>(New);
1533      --SemaRef.NonInstantiationEntries;
1534    }
1535  }
1536
1537  const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
1538  assert(Proto && "Function template without prototype?");
1539
1540  if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() ||
1541      Proto->getNoReturnAttr()) {
1542    // The function has an exception specification or a "noreturn"
1543    // attribute. Substitute into each of the exception types.
1544    llvm::SmallVector<QualType, 4> Exceptions;
1545    for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) {
1546      // FIXME: Poor location information!
1547      QualType T
1548        = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs,
1549                            New->getLocation(), New->getDeclName());
1550      if (T.isNull() ||
1551          SemaRef.CheckSpecifiedExceptionType(T, New->getLocation()))
1552        continue;
1553
1554      Exceptions.push_back(T);
1555    }
1556
1557    // Rebuild the function type
1558
1559    const FunctionProtoType *NewProto
1560      = New->getType()->getAs<FunctionProtoType>();
1561    assert(NewProto && "Template instantiation without function prototype?");
1562    New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
1563                                                 NewProto->arg_type_begin(),
1564                                                 NewProto->getNumArgs(),
1565                                                 NewProto->isVariadic(),
1566                                                 NewProto->getTypeQuals(),
1567                                                 Proto->hasExceptionSpec(),
1568                                                 Proto->hasAnyExceptionSpec(),
1569                                                 Exceptions.size(),
1570                                                 Exceptions.data(),
1571                                                 Proto->getNoReturnAttr(),
1572                                                 Proto->getCallConv()));
1573  }
1574
1575  return false;
1576}
1577
1578/// \brief Initializes common fields of an instantiated method
1579/// declaration (New) from the corresponding fields of its template
1580/// (Tmpl).
1581///
1582/// \returns true if there was an error
1583bool
1584TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
1585                                                  CXXMethodDecl *Tmpl) {
1586  if (InitFunctionInstantiation(New, Tmpl))
1587    return true;
1588
1589  CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
1590  New->setAccess(Tmpl->getAccess());
1591  if (Tmpl->isVirtualAsWritten())
1592    Record->setMethodAsVirtual(New);
1593
1594  // FIXME: attributes
1595  // FIXME: New needs a pointer to Tmpl
1596  return false;
1597}
1598
1599/// \brief Instantiate the definition of the given function from its
1600/// template.
1601///
1602/// \param PointOfInstantiation the point at which the instantiation was
1603/// required. Note that this is not precisely a "point of instantiation"
1604/// for the function, but it's close.
1605///
1606/// \param Function the already-instantiated declaration of a
1607/// function template specialization or member function of a class template
1608/// specialization.
1609///
1610/// \param Recursive if true, recursively instantiates any functions that
1611/// are required by this instantiation.
1612///
1613/// \param DefinitionRequired if true, then we are performing an explicit
1614/// instantiation where the body of the function is required. Complain if
1615/// there is no such body.
1616void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
1617                                         FunctionDecl *Function,
1618                                         bool Recursive,
1619                                         bool DefinitionRequired) {
1620  if (Function->isInvalidDecl())
1621    return;
1622
1623  assert(!Function->getBody() && "Already instantiated!");
1624
1625  // Never instantiate an explicit specialization.
1626  if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
1627    return;
1628
1629  // Find the function body that we'll be substituting.
1630  const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
1631  Stmt *Pattern = 0;
1632  if (PatternDecl)
1633    Pattern = PatternDecl->getBody(PatternDecl);
1634
1635  if (!Pattern) {
1636    if (DefinitionRequired) {
1637      if (Function->getPrimaryTemplate())
1638        Diag(PointOfInstantiation,
1639             diag::err_explicit_instantiation_undefined_func_template)
1640          << Function->getPrimaryTemplate();
1641      else
1642        Diag(PointOfInstantiation,
1643             diag::err_explicit_instantiation_undefined_member)
1644          << 1 << Function->getDeclName() << Function->getDeclContext();
1645
1646      if (PatternDecl)
1647        Diag(PatternDecl->getLocation(),
1648             diag::note_explicit_instantiation_here);
1649    }
1650
1651    return;
1652  }
1653
1654  // C++0x [temp.explicit]p9:
1655  //   Except for inline functions, other explicit instantiation declarations
1656  //   have the effect of suppressing the implicit instantiation of the entity
1657  //   to which they refer.
1658  if (Function->getTemplateSpecializationKind()
1659        == TSK_ExplicitInstantiationDeclaration &&
1660      !PatternDecl->isInlined())
1661    return;
1662
1663  InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
1664  if (Inst)
1665    return;
1666
1667  // If we're performing recursive template instantiation, create our own
1668  // queue of pending implicit instantiations that we will instantiate later,
1669  // while we're still within our own instantiation context.
1670  std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
1671  if (Recursive)
1672    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1673
1674  ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function));
1675
1676  // Introduce a new scope where local variable instantiations will be
1677  // recorded, unless we're actually a member function within a local
1678  // class, in which case we need to merge our results with the parent
1679  // scope (of the enclosing function).
1680  bool MergeWithParentScope = false;
1681  if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext()))
1682    MergeWithParentScope = Rec->isLocalClass();
1683
1684  LocalInstantiationScope Scope(*this, MergeWithParentScope);
1685
1686  // Introduce the instantiated function parameters into the local
1687  // instantiation scope.
1688  for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I)
1689    Scope.InstantiatedLocal(PatternDecl->getParamDecl(I),
1690                            Function->getParamDecl(I));
1691
1692  // Enter the scope of this instantiation. We don't use
1693  // PushDeclContext because we don't have a scope.
1694  DeclContext *PreviousContext = CurContext;
1695  CurContext = Function;
1696
1697  MultiLevelTemplateArgumentList TemplateArgs =
1698    getTemplateInstantiationArgs(Function);
1699
1700  // If this is a constructor, instantiate the member initializers.
1701  if (const CXXConstructorDecl *Ctor =
1702        dyn_cast<CXXConstructorDecl>(PatternDecl)) {
1703    InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor,
1704                               TemplateArgs);
1705  }
1706
1707  // Instantiate the function body.
1708  OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs);
1709
1710  if (Body.isInvalid())
1711    Function->setInvalidDecl();
1712
1713  ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body),
1714                          /*IsInstantiation=*/true);
1715
1716  CurContext = PreviousContext;
1717
1718  DeclGroupRef DG(Function);
1719  Consumer.HandleTopLevelDecl(DG);
1720
1721  // This class may have local implicit instantiations that need to be
1722  // instantiation within this scope.
1723  PerformPendingImplicitInstantiations(/*LocalOnly=*/true);
1724  Scope.Exit();
1725
1726  if (Recursive) {
1727    // Instantiate any pending implicit instantiations found during the
1728    // instantiation of this template.
1729    PerformPendingImplicitInstantiations();
1730
1731    // Restore the set of pending implicit instantiations.
1732    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1733  }
1734}
1735
1736/// \brief Instantiate the definition of the given variable from its
1737/// template.
1738///
1739/// \param PointOfInstantiation the point at which the instantiation was
1740/// required. Note that this is not precisely a "point of instantiation"
1741/// for the function, but it's close.
1742///
1743/// \param Var the already-instantiated declaration of a static member
1744/// variable of a class template specialization.
1745///
1746/// \param Recursive if true, recursively instantiates any functions that
1747/// are required by this instantiation.
1748///
1749/// \param DefinitionRequired if true, then we are performing an explicit
1750/// instantiation where an out-of-line definition of the member variable
1751/// is required. Complain if there is no such definition.
1752void Sema::InstantiateStaticDataMemberDefinition(
1753                                          SourceLocation PointOfInstantiation,
1754                                                 VarDecl *Var,
1755                                                 bool Recursive,
1756                                                 bool DefinitionRequired) {
1757  if (Var->isInvalidDecl())
1758    return;
1759
1760  // Find the out-of-line definition of this static data member.
1761  VarDecl *Def = Var->getInstantiatedFromStaticDataMember();
1762  assert(Def && "This data member was not instantiated from a template?");
1763  assert(Def->isStaticDataMember() && "Not a static data member?");
1764  Def = Def->getOutOfLineDefinition();
1765
1766  if (!Def) {
1767    // We did not find an out-of-line definition of this static data member,
1768    // so we won't perform any instantiation. Rather, we rely on the user to
1769    // instantiate this definition (or provide a specialization for it) in
1770    // another translation unit.
1771    if (DefinitionRequired) {
1772      Def = Var->getInstantiatedFromStaticDataMember();
1773      Diag(PointOfInstantiation,
1774           diag::err_explicit_instantiation_undefined_member)
1775        << 2 << Var->getDeclName() << Var->getDeclContext();
1776      Diag(Def->getLocation(), diag::note_explicit_instantiation_here);
1777    }
1778
1779    return;
1780  }
1781
1782  // Never instantiate an explicit specialization.
1783  if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
1784    return;
1785
1786  // C++0x [temp.explicit]p9:
1787  //   Except for inline functions, other explicit instantiation declarations
1788  //   have the effect of suppressing the implicit instantiation of the entity
1789  //   to which they refer.
1790  if (Var->getTemplateSpecializationKind()
1791        == TSK_ExplicitInstantiationDeclaration)
1792    return;
1793
1794  InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
1795  if (Inst)
1796    return;
1797
1798  // If we're performing recursive template instantiation, create our own
1799  // queue of pending implicit instantiations that we will instantiate later,
1800  // while we're still within our own instantiation context.
1801  std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
1802  if (Recursive)
1803    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1804
1805  // Enter the scope of this instantiation. We don't use
1806  // PushDeclContext because we don't have a scope.
1807  DeclContext *PreviousContext = CurContext;
1808  CurContext = Var->getDeclContext();
1809
1810  VarDecl *OldVar = Var;
1811  Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(),
1812                                          getTemplateInstantiationArgs(Var)));
1813  CurContext = PreviousContext;
1814
1815  if (Var) {
1816    Var->setPreviousDeclaration(OldVar);
1817    MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo();
1818    assert(MSInfo && "Missing member specialization information?");
1819    Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(),
1820                                       MSInfo->getPointOfInstantiation());
1821    DeclGroupRef DG(Var);
1822    Consumer.HandleTopLevelDecl(DG);
1823  }
1824
1825  if (Recursive) {
1826    // Instantiate any pending implicit instantiations found during the
1827    // instantiation of this template.
1828    PerformPendingImplicitInstantiations();
1829
1830    // Restore the set of pending implicit instantiations.
1831    PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
1832  }
1833}
1834
1835void
1836Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
1837                                 const CXXConstructorDecl *Tmpl,
1838                           const MultiLevelTemplateArgumentList &TemplateArgs) {
1839
1840  llvm::SmallVector<MemInitTy*, 4> NewInits;
1841  bool AnyErrors = false;
1842
1843  // Instantiate all the initializers.
1844  for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(),
1845                                            InitsEnd = Tmpl->init_end();
1846       Inits != InitsEnd; ++Inits) {
1847    CXXBaseOrMemberInitializer *Init = *Inits;
1848
1849    ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this);
1850    llvm::SmallVector<SourceLocation, 4> CommaLocs;
1851
1852    // Instantiate all the arguments.
1853    Expr *InitE = Init->getInit();
1854    if (!InitE) {
1855      // Nothing to instantiate;
1856    } else if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(InitE)) {
1857      if (InstantiateInitializationArguments(*this, ParenList->getExprs(),
1858                                             ParenList->getNumExprs(),
1859                                             TemplateArgs, CommaLocs,
1860                                             NewArgs)) {
1861        AnyErrors = true;
1862        continue;
1863      }
1864    } else {
1865      OwningExprResult InitArg = SubstExpr(InitE, TemplateArgs);
1866      if (InitArg.isInvalid()) {
1867        AnyErrors = true;
1868        continue;
1869      }
1870
1871      NewArgs.push_back(InitArg.release());
1872    }
1873
1874    MemInitResult NewInit;
1875    if (Init->isBaseInitializer()) {
1876      TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(),
1877                                            TemplateArgs,
1878                                            Init->getSourceLocation(),
1879                                            New->getDeclName());
1880      if (!BaseTInfo) {
1881        AnyErrors = true;
1882        New->setInvalidDecl();
1883        continue;
1884      }
1885
1886      NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo,
1887                                     (Expr **)NewArgs.data(),
1888                                     NewArgs.size(),
1889                                     Init->getLParenLoc(),
1890                                     Init->getRParenLoc(),
1891                                     New->getParent());
1892    } else if (Init->isMemberInitializer()) {
1893      FieldDecl *Member;
1894
1895      // Is this an anonymous union?
1896      if (FieldDecl *UnionInit = Init->getAnonUnionMember())
1897        Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit, TemplateArgs));
1898      else
1899        Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember(),
1900                                                      TemplateArgs));
1901
1902      NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(),
1903                                       NewArgs.size(),
1904                                       Init->getSourceLocation(),
1905                                       Init->getLParenLoc(),
1906                                       Init->getRParenLoc());
1907    }
1908
1909    if (NewInit.isInvalid()) {
1910      AnyErrors = true;
1911      New->setInvalidDecl();
1912    } else {
1913      // FIXME: It would be nice if ASTOwningVector had a release function.
1914      NewArgs.take();
1915
1916      NewInits.push_back((MemInitTy *)NewInit.get());
1917    }
1918  }
1919
1920  // Assign all the initializers to the new constructor.
1921  ActOnMemInitializers(DeclPtrTy::make(New),
1922                       /*FIXME: ColonLoc */
1923                       SourceLocation(),
1924                       NewInits.data(), NewInits.size(),
1925                       AnyErrors);
1926}
1927
1928// TODO: this could be templated if the various decl types used the
1929// same method name.
1930static bool isInstantiationOf(ClassTemplateDecl *Pattern,
1931                              ClassTemplateDecl *Instance) {
1932  Pattern = Pattern->getCanonicalDecl();
1933
1934  do {
1935    Instance = Instance->getCanonicalDecl();
1936    if (Pattern == Instance) return true;
1937    Instance = Instance->getInstantiatedFromMemberTemplate();
1938  } while (Instance);
1939
1940  return false;
1941}
1942
1943static bool isInstantiationOf(FunctionTemplateDecl *Pattern,
1944                              FunctionTemplateDecl *Instance) {
1945  Pattern = Pattern->getCanonicalDecl();
1946
1947  do {
1948    Instance = Instance->getCanonicalDecl();
1949    if (Pattern == Instance) return true;
1950    Instance = Instance->getInstantiatedFromMemberTemplate();
1951  } while (Instance);
1952
1953  return false;
1954}
1955
1956static bool
1957isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern,
1958                  ClassTemplatePartialSpecializationDecl *Instance) {
1959  Pattern
1960    = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl());
1961  do {
1962    Instance = cast<ClassTemplatePartialSpecializationDecl>(
1963                                                Instance->getCanonicalDecl());
1964    if (Pattern == Instance)
1965      return true;
1966    Instance = Instance->getInstantiatedFromMember();
1967  } while (Instance);
1968
1969  return false;
1970}
1971
1972static bool isInstantiationOf(CXXRecordDecl *Pattern,
1973                              CXXRecordDecl *Instance) {
1974  Pattern = Pattern->getCanonicalDecl();
1975
1976  do {
1977    Instance = Instance->getCanonicalDecl();
1978    if (Pattern == Instance) return true;
1979    Instance = Instance->getInstantiatedFromMemberClass();
1980  } while (Instance);
1981
1982  return false;
1983}
1984
1985static bool isInstantiationOf(FunctionDecl *Pattern,
1986                              FunctionDecl *Instance) {
1987  Pattern = Pattern->getCanonicalDecl();
1988
1989  do {
1990    Instance = Instance->getCanonicalDecl();
1991    if (Pattern == Instance) return true;
1992    Instance = Instance->getInstantiatedFromMemberFunction();
1993  } while (Instance);
1994
1995  return false;
1996}
1997
1998static bool isInstantiationOf(EnumDecl *Pattern,
1999                              EnumDecl *Instance) {
2000  Pattern = Pattern->getCanonicalDecl();
2001
2002  do {
2003    Instance = Instance->getCanonicalDecl();
2004    if (Pattern == Instance) return true;
2005    Instance = Instance->getInstantiatedFromMemberEnum();
2006  } while (Instance);
2007
2008  return false;
2009}
2010
2011static bool isInstantiationOf(UsingShadowDecl *Pattern,
2012                              UsingShadowDecl *Instance,
2013                              ASTContext &C) {
2014  return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern;
2015}
2016
2017static bool isInstantiationOf(UsingDecl *Pattern,
2018                              UsingDecl *Instance,
2019                              ASTContext &C) {
2020  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2021}
2022
2023static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern,
2024                              UsingDecl *Instance,
2025                              ASTContext &C) {
2026  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2027}
2028
2029static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern,
2030                              UsingDecl *Instance,
2031                              ASTContext &C) {
2032  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
2033}
2034
2035static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
2036                                              VarDecl *Instance) {
2037  assert(Instance->isStaticDataMember());
2038
2039  Pattern = Pattern->getCanonicalDecl();
2040
2041  do {
2042    Instance = Instance->getCanonicalDecl();
2043    if (Pattern == Instance) return true;
2044    Instance = Instance->getInstantiatedFromStaticDataMember();
2045  } while (Instance);
2046
2047  return false;
2048}
2049
2050// Other is the prospective instantiation
2051// D is the prospective pattern
2052static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
2053  if (D->getKind() != Other->getKind()) {
2054    if (UnresolvedUsingTypenameDecl *UUD
2055          = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
2056      if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
2057        return isInstantiationOf(UUD, UD, Ctx);
2058      }
2059    }
2060
2061    if (UnresolvedUsingValueDecl *UUD
2062          = dyn_cast<UnresolvedUsingValueDecl>(D)) {
2063      if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
2064        return isInstantiationOf(UUD, UD, Ctx);
2065      }
2066    }
2067
2068    return false;
2069  }
2070
2071  if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other))
2072    return isInstantiationOf(cast<CXXRecordDecl>(D), Record);
2073
2074  if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other))
2075    return isInstantiationOf(cast<FunctionDecl>(D), Function);
2076
2077  if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other))
2078    return isInstantiationOf(cast<EnumDecl>(D), Enum);
2079
2080  if (VarDecl *Var = dyn_cast<VarDecl>(Other))
2081    if (Var->isStaticDataMember())
2082      return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var);
2083
2084  if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other))
2085    return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp);
2086
2087  if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other))
2088    return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp);
2089
2090  if (ClassTemplatePartialSpecializationDecl *PartialSpec
2091        = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other))
2092    return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D),
2093                             PartialSpec);
2094
2095  if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) {
2096    if (!Field->getDeclName()) {
2097      // This is an unnamed field.
2098      return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) ==
2099        cast<FieldDecl>(D);
2100    }
2101  }
2102
2103  if (UsingDecl *Using = dyn_cast<UsingDecl>(Other))
2104    return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
2105
2106  if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other))
2107    return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
2108
2109  return D->getDeclName() && isa<NamedDecl>(Other) &&
2110    D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
2111}
2112
2113template<typename ForwardIterator>
2114static NamedDecl *findInstantiationOf(ASTContext &Ctx,
2115                                      NamedDecl *D,
2116                                      ForwardIterator first,
2117                                      ForwardIterator last) {
2118  for (; first != last; ++first)
2119    if (isInstantiationOf(Ctx, D, *first))
2120      return cast<NamedDecl>(*first);
2121
2122  return 0;
2123}
2124
2125/// \brief Finds the instantiation of the given declaration context
2126/// within the current instantiation.
2127///
2128/// \returns NULL if there was an error
2129DeclContext *Sema::FindInstantiatedContext(DeclContext* DC,
2130                          const MultiLevelTemplateArgumentList &TemplateArgs) {
2131  if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) {
2132    Decl* ID = FindInstantiatedDecl(D, TemplateArgs);
2133    return cast_or_null<DeclContext>(ID);
2134  } else return DC;
2135}
2136
2137/// \brief Find the instantiation of the given declaration within the
2138/// current instantiation.
2139///
2140/// This routine is intended to be used when \p D is a declaration
2141/// referenced from within a template, that needs to mapped into the
2142/// corresponding declaration within an instantiation. For example,
2143/// given:
2144///
2145/// \code
2146/// template<typename T>
2147/// struct X {
2148///   enum Kind {
2149///     KnownValue = sizeof(T)
2150///   };
2151///
2152///   bool getKind() const { return KnownValue; }
2153/// };
2154///
2155/// template struct X<int>;
2156/// \endcode
2157///
2158/// In the instantiation of X<int>::getKind(), we need to map the
2159/// EnumConstantDecl for KnownValue (which refers to
2160/// X<T>::<Kind>::KnownValue) to its instantiation
2161/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs
2162/// this mapping from within the instantiation of X<int>.
2163NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D,
2164                          const MultiLevelTemplateArgumentList &TemplateArgs) {
2165  DeclContext *ParentDC = D->getDeclContext();
2166  if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) ||
2167      isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) ||
2168      ParentDC->isFunctionOrMethod()) {
2169    // D is a local of some kind. Look into the map of local
2170    // declarations to their instantiations.
2171    return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D));
2172  }
2173
2174  if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
2175    if (!Record->isDependentContext())
2176      return D;
2177
2178    // If the RecordDecl is actually the injected-class-name or a
2179    // "templated" declaration for a class template, class template
2180    // partial specialization, or a member class of a class template,
2181    // substitute into the injected-class-name of the class template
2182    // or partial specialization to find the new DeclContext.
2183    QualType T;
2184    ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate();
2185
2186    if (ClassTemplate) {
2187      T = ClassTemplate->getInjectedClassNameType(Context);
2188    } else if (ClassTemplatePartialSpecializationDecl *PartialSpec
2189                 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2190      T = Context.getTypeDeclType(Record);
2191      ClassTemplate = PartialSpec->getSpecializedTemplate();
2192    }
2193
2194    if (!T.isNull()) {
2195      // Substitute into the injected-class-name to get the type
2196      // corresponding to the instantiation we want, which may also be
2197      // the current instantiation (if we're in a template
2198      // definition). This substitution should never fail, since we
2199      // know we can instantiate the injected-class-name or we
2200      // wouldn't have gotten to the injected-class-name!
2201
2202      // FIXME: Can we use the CurrentInstantiationScope to avoid this
2203      // extra instantiation in the common case?
2204      T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName());
2205      assert(!T.isNull() && "Instantiation of injected-class-name cannot fail.");
2206
2207      if (!T->isDependentType()) {
2208        assert(T->isRecordType() && "Instantiation must produce a record type");
2209        return T->getAs<RecordType>()->getDecl();
2210      }
2211
2212      // We are performing "partial" template instantiation to create
2213      // the member declarations for the members of a class template
2214      // specialization. Therefore, D is actually referring to something
2215      // in the current instantiation. Look through the current
2216      // context, which contains actual instantiations, to find the
2217      // instantiation of the "current instantiation" that D refers
2218      // to.
2219      bool SawNonDependentContext = false;
2220      for (DeclContext *DC = CurContext; !DC->isFileContext();
2221           DC = DC->getParent()) {
2222        if (ClassTemplateSpecializationDecl *Spec
2223                          = dyn_cast<ClassTemplateSpecializationDecl>(DC))
2224          if (isInstantiationOf(ClassTemplate,
2225                                Spec->getSpecializedTemplate()))
2226            return Spec;
2227
2228        if (!DC->isDependentContext())
2229          SawNonDependentContext = true;
2230      }
2231
2232      // We're performing "instantiation" of a member of the current
2233      // instantiation while we are type-checking the
2234      // definition. Compute the declaration context and return that.
2235      assert(!SawNonDependentContext &&
2236             "No dependent context while instantiating record");
2237      DeclContext *DC = computeDeclContext(T);
2238      assert(DC &&
2239             "Unable to find declaration for the current instantiation");
2240      return cast<CXXRecordDecl>(DC);
2241    }
2242
2243    // Fall through to deal with other dependent record types (e.g.,
2244    // anonymous unions in class templates).
2245  }
2246
2247  if (!ParentDC->isDependentContext())
2248    return D;
2249
2250  ParentDC = FindInstantiatedContext(ParentDC, TemplateArgs);
2251  if (!ParentDC)
2252    return 0;
2253
2254  if (ParentDC != D->getDeclContext()) {
2255    // We performed some kind of instantiation in the parent context,
2256    // so now we need to look into the instantiated parent context to
2257    // find the instantiation of the declaration D.
2258    NamedDecl *Result = 0;
2259    if (D->getDeclName()) {
2260      DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
2261      Result = findInstantiationOf(Context, D, Found.first, Found.second);
2262    } else {
2263      // Since we don't have a name for the entity we're looking for,
2264      // our only option is to walk through all of the declarations to
2265      // find that name. This will occur in a few cases:
2266      //
2267      //   - anonymous struct/union within a template
2268      //   - unnamed class/struct/union/enum within a template
2269      //
2270      // FIXME: Find a better way to find these instantiations!
2271      Result = findInstantiationOf(Context, D,
2272                                   ParentDC->decls_begin(),
2273                                   ParentDC->decls_end());
2274    }
2275
2276    // UsingShadowDecls can instantiate to nothing because of using hiding.
2277    assert((Result || isa<UsingShadowDecl>(D))
2278           && "Unable to find instantiation of declaration!");
2279
2280    D = Result;
2281  }
2282
2283  return D;
2284}
2285
2286/// \brief Performs template instantiation for all implicit template
2287/// instantiations we have seen until this point.
2288void Sema::PerformPendingImplicitInstantiations(bool LocalOnly) {
2289  while (!PendingLocalImplicitInstantiations.empty() ||
2290         (!LocalOnly && !PendingImplicitInstantiations.empty())) {
2291    PendingImplicitInstantiation Inst;
2292
2293    if (PendingLocalImplicitInstantiations.empty()) {
2294      Inst = PendingImplicitInstantiations.front();
2295      PendingImplicitInstantiations.pop_front();
2296    } else {
2297      Inst = PendingLocalImplicitInstantiations.front();
2298      PendingLocalImplicitInstantiations.pop_front();
2299    }
2300
2301    // Instantiate function definitions
2302    if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
2303      PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function),
2304                                            Function->getLocation(), *this,
2305                                            Context.getSourceManager(),
2306                                           "instantiating function definition");
2307
2308      if (!Function->getBody())
2309        InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true);
2310      continue;
2311    }
2312
2313    // Instantiate static data member definitions.
2314    VarDecl *Var = cast<VarDecl>(Inst.first);
2315    assert(Var->isStaticDataMember() && "Not a static data member?");
2316
2317    PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var),
2318                                          Var->getLocation(), *this,
2319                                          Context.getSourceManager(),
2320                                          "instantiating static data member "
2321                                          "definition");
2322
2323    InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true);
2324  }
2325}
2326