DeclSpec.cpp revision 1ab0d90af489b5441d0bf25338d420ddae3ece74 
1//===--- SemaDeclSpec.cpp - Declaration Specifier Semantic Analysis -------===//
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//
10//  This file implements semantic analysis for declaration specifiers.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Parse/ParseDiagnostic.h" // FIXME: remove this back-dependency!
15#include "clang/Sema/DeclSpec.h"
16#include "clang/Sema/LocInfoType.h"
17#include "clang/Sema/ParsedTemplate.h"
18#include "clang/AST/ASTContext.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/NestedNameSpecifier.h"
21#include "clang/AST/TypeLoc.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Basic/LangOptions.h"
24#include "llvm/ADT/STLExtras.h"
25#include "llvm/Support/ErrorHandling.h"
26#include <cstring>
27using namespace clang;
28
29
30static DiagnosticBuilder Diag(Diagnostic &D, SourceLocation Loc,
31                              unsigned DiagID) {
32  return D.Report(Loc, DiagID);
33}
34
35
36void UnqualifiedId::setTemplateId(TemplateIdAnnotation *TemplateId) {
37  assert(TemplateId && "NULL template-id annotation?");
38  Kind = IK_TemplateId;
39  this->TemplateId = TemplateId;
40  StartLocation = TemplateId->TemplateNameLoc;
41  EndLocation = TemplateId->RAngleLoc;
42}
43
44void UnqualifiedId::setConstructorTemplateId(TemplateIdAnnotation *TemplateId) {
45  assert(TemplateId && "NULL template-id annotation?");
46  Kind = IK_ConstructorTemplateId;
47  this->TemplateId = TemplateId;
48  StartLocation = TemplateId->TemplateNameLoc;
49  EndLocation = TemplateId->RAngleLoc;
50}
51
52void CXXScopeSpec::Extend(ASTContext &Context, SourceLocation TemplateKWLoc,
53                          TypeLoc TL, SourceLocation ColonColonLoc) {
54  Builder.Extend(Context, TemplateKWLoc, TL, ColonColonLoc);
55  if (Range.getBegin().isInvalid())
56    Range.setBegin(TL.getBeginLoc());
57  Range.setEnd(ColonColonLoc);
58
59  assert(Range == Builder.getSourceRange() &&
60         "NestedNameSpecifierLoc range computation incorrect");
61}
62
63void CXXScopeSpec::Extend(ASTContext &Context, IdentifierInfo *Identifier,
64                          SourceLocation IdentifierLoc,
65                          SourceLocation ColonColonLoc) {
66  Builder.Extend(Context, Identifier, IdentifierLoc, ColonColonLoc);
67
68  if (Range.getBegin().isInvalid())
69    Range.setBegin(IdentifierLoc);
70  Range.setEnd(ColonColonLoc);
71
72  assert(Range == Builder.getSourceRange() &&
73         "NestedNameSpecifierLoc range computation incorrect");
74}
75
76void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
77                          SourceLocation NamespaceLoc,
78                          SourceLocation ColonColonLoc) {
79  Builder.Extend(Context, Namespace, NamespaceLoc, ColonColonLoc);
80
81  if (Range.getBegin().isInvalid())
82    Range.setBegin(NamespaceLoc);
83  Range.setEnd(ColonColonLoc);
84
85  assert(Range == Builder.getSourceRange() &&
86         "NestedNameSpecifierLoc range computation incorrect");
87}
88
89void CXXScopeSpec::Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
90                          SourceLocation AliasLoc,
91                          SourceLocation ColonColonLoc) {
92  Builder.Extend(Context, Alias, AliasLoc, ColonColonLoc);
93
94  if (Range.getBegin().isInvalid())
95    Range.setBegin(AliasLoc);
96  Range.setEnd(ColonColonLoc);
97
98  assert(Range == Builder.getSourceRange() &&
99         "NestedNameSpecifierLoc range computation incorrect");
100}
101
102void CXXScopeSpec::MakeGlobal(ASTContext &Context,
103                              SourceLocation ColonColonLoc) {
104  Builder.MakeGlobal(Context, ColonColonLoc);
105
106  Range = SourceRange(ColonColonLoc);
107
108  assert(Range == Builder.getSourceRange() &&
109         "NestedNameSpecifierLoc range computation incorrect");
110}
111
112void CXXScopeSpec::MakeTrivial(ASTContext &Context,
113                               NestedNameSpecifier *Qualifier, SourceRange R) {
114  Builder.MakeTrivial(Context, Qualifier, R);
115  Range = R;
116}
117
118void CXXScopeSpec::Adopt(NestedNameSpecifierLoc Other) {
119  if (!Other) {
120    Range = SourceRange();
121    Builder.Clear();
122    return;
123  }
124
125  Range = Other.getSourceRange();
126  Builder.Adopt(Other);
127}
128
129NestedNameSpecifierLoc
130CXXScopeSpec::getWithLocInContext(ASTContext &Context) const {
131  if (!Builder.getRepresentation())
132    return NestedNameSpecifierLoc();
133
134  return Builder.getWithLocInContext(Context);
135}
136
137/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
138/// "TheDeclarator" is the declarator that this will be added to.
139DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto, bool isVariadic,
140                                             SourceLocation EllipsisLoc,
141                                             ParamInfo *ArgInfo,
142                                             unsigned NumArgs,
143                                             unsigned TypeQuals,
144                                             bool RefQualifierIsLvalueRef,
145                                             SourceLocation RefQualifierLoc,
146                                             ExceptionSpecificationType
147                                                 ESpecType,
148                                             SourceLocation ESpecLoc,
149                                             ParsedType *Exceptions,
150                                             SourceRange *ExceptionRanges,
151                                             unsigned NumExceptions,
152                                             Expr *NoexceptExpr,
153                                             SourceLocation LocalRangeBegin,
154                                             SourceLocation LocalRangeEnd,
155                                             Declarator &TheDeclarator,
156                                             ParsedType TrailingReturnType) {
157  DeclaratorChunk I;
158  I.Kind                        = Function;
159  I.Loc                         = LocalRangeBegin;
160  I.EndLoc                      = LocalRangeEnd;
161  I.Fun.AttrList                = 0;
162  I.Fun.hasPrototype            = hasProto;
163  I.Fun.isVariadic              = isVariadic;
164  I.Fun.EllipsisLoc             = EllipsisLoc.getRawEncoding();
165  I.Fun.DeleteArgInfo           = false;
166  I.Fun.TypeQuals               = TypeQuals;
167  I.Fun.NumArgs                 = NumArgs;
168  I.Fun.ArgInfo                 = 0;
169  I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
170  I.Fun.RefQualifierLoc         = RefQualifierLoc.getRawEncoding();
171  I.Fun.ExceptionSpecType       = ESpecType;
172  I.Fun.ExceptionSpecLoc        = ESpecLoc.getRawEncoding();
173  I.Fun.NumExceptions           = 0;
174  I.Fun.Exceptions              = 0;
175  I.Fun.NoexceptExpr            = 0;
176  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
177
178  // new[] an argument array if needed.
179  if (NumArgs) {
180    // If the 'InlineParams' in Declarator is unused and big enough, put our
181    // parameter list there (in an effort to avoid new/delete traffic).  If it
182    // is already used (consider a function returning a function pointer) or too
183    // small (function taking too many arguments), go to the heap.
184    if (!TheDeclarator.InlineParamsUsed &&
185        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
186      I.Fun.ArgInfo = TheDeclarator.InlineParams;
187      I.Fun.DeleteArgInfo = false;
188      TheDeclarator.InlineParamsUsed = true;
189    } else {
190      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
191      I.Fun.DeleteArgInfo = true;
192    }
193    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
194  }
195
196  // Check what exception specification information we should actually store.
197  switch (ESpecType) {
198  default: break; // By default, save nothing.
199  case EST_Dynamic:
200    // new[] an exception array if needed
201    if (NumExceptions) {
202      I.Fun.NumExceptions = NumExceptions;
203      I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
204      for (unsigned i = 0; i != NumExceptions; ++i) {
205        I.Fun.Exceptions[i].Ty = Exceptions[i];
206        I.Fun.Exceptions[i].Range = ExceptionRanges[i];
207      }
208    }
209    break;
210
211  case EST_ComputedNoexcept:
212    I.Fun.NoexceptExpr = NoexceptExpr;
213    break;
214  }
215  return I;
216}
217
218bool Declarator::isDeclarationOfFunction() const {
219  for (unsigned i = 0, i_end = DeclTypeInfo.size(); i < i_end; ++i) {
220    switch (DeclTypeInfo[i].Kind) {
221    case DeclaratorChunk::Function:
222      return true;
223    case DeclaratorChunk::Paren:
224      continue;
225    case DeclaratorChunk::Pointer:
226    case DeclaratorChunk::Reference:
227    case DeclaratorChunk::Array:
228    case DeclaratorChunk::BlockPointer:
229    case DeclaratorChunk::MemberPointer:
230      return false;
231    }
232    llvm_unreachable("Invalid type chunk");
233    return false;
234  }
235
236  switch (DS.getTypeSpecType()) {
237    case TST_auto:
238    case TST_bool:
239    case TST_char:
240    case TST_char16:
241    case TST_char32:
242    case TST_class:
243    case TST_decimal128:
244    case TST_decimal32:
245    case TST_decimal64:
246    case TST_double:
247    case TST_enum:
248    case TST_error:
249    case TST_float:
250    case TST_int:
251    case TST_struct:
252    case TST_union:
253    case TST_unknown_anytype:
254    case TST_unspecified:
255    case TST_void:
256    case TST_wchar:
257      return false;
258
259    case TST_decltype:
260    case TST_typeofExpr:
261      if (Expr *E = DS.getRepAsExpr())
262        return E->getType()->isFunctionType();
263      return false;
264
265    case TST_underlyingType:
266    case TST_typename:
267    case TST_typeofType: {
268      QualType QT = DS.getRepAsType().get();
269      if (QT.isNull())
270        return false;
271
272      if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT))
273        QT = LIT->getType();
274
275      if (QT.isNull())
276        return false;
277
278      return QT->isFunctionType();
279    }
280  }
281
282  return false;
283}
284
285/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
286/// declaration specifier includes.
287///
288unsigned DeclSpec::getParsedSpecifiers() const {
289  unsigned Res = 0;
290  if (StorageClassSpec != SCS_unspecified ||
291      SCS_thread_specified)
292    Res |= PQ_StorageClassSpecifier;
293
294  if (TypeQualifiers != TQ_unspecified)
295    Res |= PQ_TypeQualifier;
296
297  if (hasTypeSpecifier())
298    Res |= PQ_TypeSpecifier;
299
300  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
301    Res |= PQ_FunctionSpecifier;
302  return Res;
303}
304
305template <class T> static bool BadSpecifier(T TNew, T TPrev,
306                                            const char *&PrevSpec,
307                                            unsigned &DiagID) {
308  PrevSpec = DeclSpec::getSpecifierName(TPrev);
309  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
310            : diag::err_invalid_decl_spec_combination);
311  return true;
312}
313
314const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
315  switch (S) {
316  case DeclSpec::SCS_unspecified: return "unspecified";
317  case DeclSpec::SCS_typedef:     return "typedef";
318  case DeclSpec::SCS_extern:      return "extern";
319  case DeclSpec::SCS_static:      return "static";
320  case DeclSpec::SCS_auto:        return "auto";
321  case DeclSpec::SCS_register:    return "register";
322  case DeclSpec::SCS_private_extern: return "__private_extern__";
323  case DeclSpec::SCS_mutable:     return "mutable";
324  }
325  llvm_unreachable("Unknown typespec!");
326}
327
328const char *DeclSpec::getSpecifierName(TSW W) {
329  switch (W) {
330  case TSW_unspecified: return "unspecified";
331  case TSW_short:       return "short";
332  case TSW_long:        return "long";
333  case TSW_longlong:    return "long long";
334  }
335  llvm_unreachable("Unknown typespec!");
336}
337
338const char *DeclSpec::getSpecifierName(TSC C) {
339  switch (C) {
340  case TSC_unspecified: return "unspecified";
341  case TSC_imaginary:   return "imaginary";
342  case TSC_complex:     return "complex";
343  }
344  llvm_unreachable("Unknown typespec!");
345}
346
347
348const char *DeclSpec::getSpecifierName(TSS S) {
349  switch (S) {
350  case TSS_unspecified: return "unspecified";
351  case TSS_signed:      return "signed";
352  case TSS_unsigned:    return "unsigned";
353  }
354  llvm_unreachable("Unknown typespec!");
355}
356
357const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
358  switch (T) {
359  case DeclSpec::TST_unspecified: return "unspecified";
360  case DeclSpec::TST_void:        return "void";
361  case DeclSpec::TST_char:        return "char";
362  case DeclSpec::TST_wchar:       return "wchar_t";
363  case DeclSpec::TST_char16:      return "char16_t";
364  case DeclSpec::TST_char32:      return "char32_t";
365  case DeclSpec::TST_int:         return "int";
366  case DeclSpec::TST_float:       return "float";
367  case DeclSpec::TST_double:      return "double";
368  case DeclSpec::TST_bool:        return "_Bool";
369  case DeclSpec::TST_decimal32:   return "_Decimal32";
370  case DeclSpec::TST_decimal64:   return "_Decimal64";
371  case DeclSpec::TST_decimal128:  return "_Decimal128";
372  case DeclSpec::TST_enum:        return "enum";
373  case DeclSpec::TST_class:       return "class";
374  case DeclSpec::TST_union:       return "union";
375  case DeclSpec::TST_struct:      return "struct";
376  case DeclSpec::TST_typename:    return "type-name";
377  case DeclSpec::TST_typeofType:
378  case DeclSpec::TST_typeofExpr:  return "typeof";
379  case DeclSpec::TST_auto:        return "auto";
380  case DeclSpec::TST_decltype:    return "(decltype)";
381  case DeclSpec::TST_underlyingType: return "__underlying_type";
382  case DeclSpec::TST_unknown_anytype: return "__unknown_anytype";
383  case DeclSpec::TST_error:       return "(error)";
384  }
385  llvm_unreachable("Unknown typespec!");
386}
387
388const char *DeclSpec::getSpecifierName(TQ T) {
389  switch (T) {
390  case DeclSpec::TQ_unspecified: return "unspecified";
391  case DeclSpec::TQ_const:       return "const";
392  case DeclSpec::TQ_restrict:    return "restrict";
393  case DeclSpec::TQ_volatile:    return "volatile";
394  }
395  llvm_unreachable("Unknown typespec!");
396}
397
398bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
399                                   const char *&PrevSpec,
400                                   unsigned &DiagID,
401                                   const LangOptions &Lang) {
402  // OpenCL prohibits extern, auto, register, and static
403  // It seems sensible to prohibit private_extern too
404  if (Lang.OpenCL) {
405    switch (S) {
406    case SCS_extern:
407    case SCS_private_extern:
408    case SCS_auto:
409    case SCS_register:
410    case SCS_static:
411      DiagID   = diag::err_not_opencl_storage_class_specifier;
412      PrevSpec = getSpecifierName(S);
413      return true;
414    default:
415      break;
416    }
417  }
418
419  if (StorageClassSpec != SCS_unspecified) {
420    // Changing storage class is allowed only if the previous one
421    // was the 'extern' that is part of a linkage specification and
422    // the new storage class is 'typedef'.
423    if (!(SCS_extern_in_linkage_spec &&
424          StorageClassSpec == SCS_extern &&
425          S == SCS_typedef))
426      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
427  }
428  StorageClassSpec = S;
429  StorageClassSpecLoc = Loc;
430  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
431  return false;
432}
433
434bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
435                                         const char *&PrevSpec,
436                                         unsigned &DiagID) {
437  if (SCS_thread_specified) {
438    PrevSpec = "__thread";
439    DiagID = diag::ext_duplicate_declspec;
440    return true;
441  }
442  SCS_thread_specified = true;
443  SCS_threadLoc = Loc;
444  return false;
445}
446
447/// These methods set the specified attribute of the DeclSpec, but return true
448/// and ignore the request if invalid (e.g. "extern" then "auto" is
449/// specified).
450bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
451                                const char *&PrevSpec,
452                                unsigned &DiagID) {
453  // Overwrite TSWLoc only if TypeSpecWidth was unspecified, so that
454  // for 'long long' we will keep the source location of the first 'long'.
455  if (TypeSpecWidth == TSW_unspecified)
456    TSWLoc = Loc;
457  // Allow turning long -> long long.
458  else if (W != TSW_longlong || TypeSpecWidth != TSW_long)
459    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
460  TypeSpecWidth = W;
461  if (TypeAltiVecVector && !TypeAltiVecBool &&
462      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
463    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
464    DiagID = diag::warn_vector_long_decl_spec_combination;
465    return true;
466  }
467  return false;
468}
469
470bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
471                                  const char *&PrevSpec,
472                                  unsigned &DiagID) {
473  if (TypeSpecComplex != TSC_unspecified)
474    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
475  TypeSpecComplex = C;
476  TSCLoc = Loc;
477  return false;
478}
479
480bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
481                               const char *&PrevSpec,
482                               unsigned &DiagID) {
483  if (TypeSpecSign != TSS_unspecified)
484    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
485  TypeSpecSign = S;
486  TSSLoc = Loc;
487  return false;
488}
489
490bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
491                               const char *&PrevSpec,
492                               unsigned &DiagID,
493                               ParsedType Rep) {
494  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep);
495}
496
497bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
498                               SourceLocation TagNameLoc,
499                               const char *&PrevSpec,
500                               unsigned &DiagID,
501                               ParsedType Rep) {
502  assert(isTypeRep(T) && "T does not store a type");
503  assert(Rep && "no type provided!");
504  if (TypeSpecType != TST_unspecified) {
505    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
506    DiagID = diag::err_invalid_decl_spec_combination;
507    return true;
508  }
509  TypeSpecType = T;
510  TypeRep = Rep;
511  TSTLoc = TagKwLoc;
512  TSTNameLoc = TagNameLoc;
513  TypeSpecOwned = false;
514  return false;
515}
516
517bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
518                               const char *&PrevSpec,
519                               unsigned &DiagID,
520                               Expr *Rep) {
521  assert(isExprRep(T) && "T does not store an expr");
522  assert(Rep && "no expression provided!");
523  if (TypeSpecType != TST_unspecified) {
524    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
525    DiagID = diag::err_invalid_decl_spec_combination;
526    return true;
527  }
528  TypeSpecType = T;
529  ExprRep = Rep;
530  TSTLoc = Loc;
531  TSTNameLoc = Loc;
532  TypeSpecOwned = false;
533  return false;
534}
535
536bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
537                               const char *&PrevSpec,
538                               unsigned &DiagID,
539                               Decl *Rep, bool Owned) {
540  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep, Owned);
541}
542
543bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
544                               SourceLocation TagNameLoc,
545                               const char *&PrevSpec,
546                               unsigned &DiagID,
547                               Decl *Rep, bool Owned) {
548  assert(isDeclRep(T) && "T does not store a decl");
549  // Unlike the other cases, we don't assert that we actually get a decl.
550
551  if (TypeSpecType != TST_unspecified) {
552    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
553    DiagID = diag::err_invalid_decl_spec_combination;
554    return true;
555  }
556  TypeSpecType = T;
557  DeclRep = Rep;
558  TSTLoc = TagKwLoc;
559  TSTNameLoc = TagNameLoc;
560  TypeSpecOwned = Owned;
561  return false;
562}
563
564bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
565                               const char *&PrevSpec,
566                               unsigned &DiagID) {
567  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
568         "rep required for these type-spec kinds!");
569  if (TypeSpecType != TST_unspecified) {
570    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
571    DiagID = diag::err_invalid_decl_spec_combination;
572    return true;
573  }
574  TSTLoc = Loc;
575  TSTNameLoc = Loc;
576  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
577    TypeAltiVecBool = true;
578    return false;
579  }
580  TypeSpecType = T;
581  TypeSpecOwned = false;
582  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
583    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
584    DiagID = diag::err_invalid_vector_decl_spec;
585    return true;
586  }
587  return false;
588}
589
590bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
591                          const char *&PrevSpec, unsigned &DiagID) {
592  if (TypeSpecType != TST_unspecified) {
593    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
594    DiagID = diag::err_invalid_vector_decl_spec_combination;
595    return true;
596  }
597  TypeAltiVecVector = isAltiVecVector;
598  AltiVecLoc = Loc;
599  return false;
600}
601
602bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
603                          const char *&PrevSpec, unsigned &DiagID) {
604  if (!TypeAltiVecVector || TypeAltiVecPixel ||
605      (TypeSpecType != TST_unspecified)) {
606    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
607    DiagID = diag::err_invalid_pixel_decl_spec_combination;
608    return true;
609  }
610  TypeAltiVecPixel = isAltiVecPixel;
611  TSTLoc = Loc;
612  TSTNameLoc = Loc;
613  return false;
614}
615
616bool DeclSpec::SetTypeSpecError() {
617  TypeSpecType = TST_error;
618  TypeSpecOwned = false;
619  TSTLoc = SourceLocation();
620  TSTNameLoc = SourceLocation();
621  return false;
622}
623
624bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
625                           unsigned &DiagID, const LangOptions &Lang) {
626  // Duplicates turn into warnings pre-C99.
627  if ((TypeQualifiers & T) && !Lang.C99)
628    return BadSpecifier(T, T, PrevSpec, DiagID);
629  TypeQualifiers |= T;
630
631  switch (T) {
632  default: assert(0 && "Unknown type qualifier!");
633  case TQ_const:    TQ_constLoc = Loc; break;
634  case TQ_restrict: TQ_restrictLoc = Loc; break;
635  case TQ_volatile: TQ_volatileLoc = Loc; break;
636  }
637  return false;
638}
639
640bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
641                                     unsigned &DiagID) {
642  // 'inline inline' is ok.
643  FS_inline_specified = true;
644  FS_inlineLoc = Loc;
645  return false;
646}
647
648bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
649                                      unsigned &DiagID) {
650  // 'virtual virtual' is ok.
651  FS_virtual_specified = true;
652  FS_virtualLoc = Loc;
653  return false;
654}
655
656bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
657                                       unsigned &DiagID) {
658  // 'explicit explicit' is ok.
659  FS_explicit_specified = true;
660  FS_explicitLoc = Loc;
661  return false;
662}
663
664bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
665                             unsigned &DiagID) {
666  if (Friend_specified) {
667    PrevSpec = "friend";
668    DiagID = diag::ext_duplicate_declspec;
669    return true;
670  }
671
672  Friend_specified = true;
673  FriendLoc = Loc;
674  return false;
675}
676
677bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
678                                unsigned &DiagID) {
679  // 'constexpr constexpr' is ok.
680  Constexpr_specified = true;
681  ConstexprLoc = Loc;
682  return false;
683}
684
685void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
686                                     unsigned NP,
687                                     SourceLocation *ProtoLocs,
688                                     SourceLocation LAngleLoc) {
689  if (NP == 0) return;
690  ProtocolQualifiers = new Decl*[NP];
691  ProtocolLocs = new SourceLocation[NP];
692  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
693  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
694  NumProtocolQualifiers = NP;
695  ProtocolLAngleLoc = LAngleLoc;
696}
697
698void DeclSpec::SaveWrittenBuiltinSpecs() {
699  writtenBS.Sign = getTypeSpecSign();
700  writtenBS.Width = getTypeSpecWidth();
701  writtenBS.Type = getTypeSpecType();
702  // Search the list of attributes for the presence of a mode attribute.
703  writtenBS.ModeAttr = false;
704  AttributeList* attrs = getAttributes().getList();
705  while (attrs) {
706    if (attrs->getKind() == AttributeList::AT_mode) {
707      writtenBS.ModeAttr = true;
708      break;
709    }
710    attrs = attrs->getNext();
711  }
712}
713
714void DeclSpec::SaveStorageSpecifierAsWritten() {
715  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
716    // If 'extern' is part of a linkage specification,
717    // then it is not a storage class "as written".
718    StorageClassSpecAsWritten = SCS_unspecified;
719  else
720    StorageClassSpecAsWritten = StorageClassSpec;
721}
722
723/// Finish - This does final analysis of the declspec, rejecting things like
724/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
725/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
726/// DeclSpec is guaranteed self-consistent, even if an error occurred.
727void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
728  // Before possibly changing their values, save specs as written.
729  SaveWrittenBuiltinSpecs();
730  SaveStorageSpecifierAsWritten();
731
732  // Check the type specifier components first.
733
734  // Validate and finalize AltiVec vector declspec.
735  if (TypeAltiVecVector) {
736    if (TypeAltiVecBool) {
737      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
738      if (TypeSpecSign != TSS_unspecified) {
739        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
740          << getSpecifierName((TSS)TypeSpecSign);
741      }
742
743      // Only char/int are valid with vector bool. (PIM 2.1)
744      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
745           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
746        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
747          << (TypeAltiVecPixel ? "__pixel" :
748                                 getSpecifierName((TST)TypeSpecType));
749      }
750
751      // Only 'short' is valid with vector bool. (PIM 2.1)
752      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
753        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
754          << getSpecifierName((TSW)TypeSpecWidth);
755
756      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
757      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
758          (TypeSpecWidth != TSW_unspecified))
759        TypeSpecSign = TSS_unsigned;
760    }
761
762    if (TypeAltiVecPixel) {
763      //TODO: perform validation
764      TypeSpecType = TST_int;
765      TypeSpecSign = TSS_unsigned;
766      TypeSpecWidth = TSW_short;
767      TypeSpecOwned = false;
768    }
769  }
770
771  // signed/unsigned are only valid with int/char/wchar_t.
772  if (TypeSpecSign != TSS_unspecified) {
773    if (TypeSpecType == TST_unspecified)
774      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
775    else if (TypeSpecType != TST_int  &&
776             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
777      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
778        << getSpecifierName((TST)TypeSpecType);
779      // signed double -> double.
780      TypeSpecSign = TSS_unspecified;
781    }
782  }
783
784  // Validate the width of the type.
785  switch (TypeSpecWidth) {
786  case TSW_unspecified: break;
787  case TSW_short:    // short int
788  case TSW_longlong: // long long int
789    if (TypeSpecType == TST_unspecified)
790      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
791    else if (TypeSpecType != TST_int) {
792      Diag(D, TSWLoc,
793           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
794                                      : diag::err_invalid_longlong_spec)
795        <<  getSpecifierName((TST)TypeSpecType);
796      TypeSpecType = TST_int;
797      TypeSpecOwned = false;
798    }
799    break;
800  case TSW_long:  // long double, long int
801    if (TypeSpecType == TST_unspecified)
802      TypeSpecType = TST_int;  // long -> long int.
803    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
804      Diag(D, TSWLoc, diag::err_invalid_long_spec)
805        << getSpecifierName((TST)TypeSpecType);
806      TypeSpecType = TST_int;
807      TypeSpecOwned = false;
808    }
809    break;
810  }
811
812  // TODO: if the implementation does not implement _Complex or _Imaginary,
813  // disallow their use.  Need information about the backend.
814  if (TypeSpecComplex != TSC_unspecified) {
815    if (TypeSpecType == TST_unspecified) {
816      Diag(D, TSCLoc, diag::ext_plain_complex)
817        << FixItHint::CreateInsertion(
818                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
819                                                 " double");
820      TypeSpecType = TST_double;   // _Complex -> _Complex double.
821    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
822      // Note that this intentionally doesn't include _Complex _Bool.
823      Diag(D, TSTLoc, diag::ext_integer_complex);
824    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
825      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
826        << getSpecifierName((TST)TypeSpecType);
827      TypeSpecComplex = TSC_unspecified;
828    }
829  }
830
831  // C++ [class.friend]p6:
832  //   No storage-class-specifier shall appear in the decl-specifier-seq
833  //   of a friend declaration.
834  if (isFriendSpecified() && getStorageClassSpec()) {
835    DeclSpec::SCS SC = getStorageClassSpec();
836    const char *SpecName = getSpecifierName(SC);
837
838    SourceLocation SCLoc = getStorageClassSpecLoc();
839    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
840
841    Diag(D, SCLoc, diag::err_friend_storage_spec)
842      << SpecName
843      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
844
845    ClearStorageClassSpecs();
846  }
847
848  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
849
850  // Okay, now we can infer the real type.
851
852  // TODO: return "auto function" and other bad things based on the real type.
853
854  // 'data definition has no type or storage class'?
855}
856
857bool DeclSpec::isMissingDeclaratorOk() {
858  TST tst = getTypeSpecType();
859  return isDeclRep(tst) && getRepAsDecl() != 0 &&
860    StorageClassSpec != DeclSpec::SCS_typedef;
861}
862
863void UnqualifiedId::clear() {
864  Kind = IK_Identifier;
865  Identifier = 0;
866  StartLocation = SourceLocation();
867  EndLocation = SourceLocation();
868}
869
870void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
871                                          OverloadedOperatorKind Op,
872                                          SourceLocation SymbolLocations[3]) {
873  Kind = IK_OperatorFunctionId;
874  StartLocation = OperatorLoc;
875  EndLocation = OperatorLoc;
876  OperatorFunctionId.Operator = Op;
877  for (unsigned I = 0; I != 3; ++I) {
878    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
879
880    if (SymbolLocations[I].isValid())
881      EndLocation = SymbolLocations[I];
882  }
883}
884
885bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
886                                  const char *&PrevSpec) {
887  LastLocation = Loc;
888
889  if (Specifiers & VS) {
890    PrevSpec = getSpecifierName(VS);
891    return true;
892  }
893
894  Specifiers |= VS;
895
896  switch (VS) {
897  default: assert(0 && "Unknown specifier!");
898  case VS_Override: VS_overrideLoc = Loc; break;
899  case VS_Final:    VS_finalLoc = Loc; break;
900  }
901
902  return false;
903}
904
905const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
906  switch (VS) {
907  default: assert(0 && "Unknown specifier");
908  case VS_Override: return "override";
909  case VS_Final: return "final";
910  }
911}
912