DeclSpec.cpp revision e2f82f71385051ce5abfba317d2f592aa332c588 
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/ParsedTemplate.h"
17#include "clang/Lex/Preprocessor.h"
18#include "clang/Basic/LangOptions.h"
19#include "llvm/ADT/STLExtras.h"
20#include "llvm/Support/ErrorHandling.h"
21#include <cstring>
22using namespace clang;
23
24
25static DiagnosticBuilder Diag(Diagnostic &D, SourceLocation Loc,
26                              unsigned DiagID) {
27  return D.Report(Loc, DiagID);
28}
29
30
31void UnqualifiedId::setTemplateId(TemplateIdAnnotation *TemplateId) {
32  assert(TemplateId && "NULL template-id annotation?");
33  Kind = IK_TemplateId;
34  this->TemplateId = TemplateId;
35  StartLocation = TemplateId->TemplateNameLoc;
36  EndLocation = TemplateId->RAngleLoc;
37}
38
39void UnqualifiedId::setConstructorTemplateId(TemplateIdAnnotation *TemplateId) {
40  assert(TemplateId && "NULL template-id annotation?");
41  Kind = IK_ConstructorTemplateId;
42  this->TemplateId = TemplateId;
43  StartLocation = TemplateId->TemplateNameLoc;
44  EndLocation = TemplateId->RAngleLoc;
45}
46
47/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
48/// "TheDeclarator" is the declarator that this will be added to.
49DeclaratorChunk DeclaratorChunk::getFunction(const ParsedAttributes &attrs,
50                                             bool hasProto, bool isVariadic,
51                                             SourceLocation EllipsisLoc,
52                                             ParamInfo *ArgInfo,
53                                             unsigned NumArgs,
54                                             unsigned TypeQuals,
55                                             bool RefQualifierIsLvalueRef,
56                                             SourceLocation RefQualifierLoc,
57                                             bool hasExceptionSpec,
58                                             SourceLocation ThrowLoc,
59                                             bool hasAnyExceptionSpec,
60                                             ParsedType *Exceptions,
61                                             SourceRange *ExceptionRanges,
62                                             unsigned NumExceptions,
63                                             SourceLocation LPLoc,
64                                             SourceLocation RPLoc,
65                                             Declarator &TheDeclarator,
66                                             ParsedType TrailingReturnType) {
67  DeclaratorChunk I;
68  I.Kind                 = Function;
69  I.Loc                  = LPLoc;
70  I.EndLoc               = RPLoc;
71  I.Fun.AttrList         = attrs.getList();
72  I.Fun.hasPrototype     = hasProto;
73  I.Fun.isVariadic       = isVariadic;
74  I.Fun.EllipsisLoc      = EllipsisLoc.getRawEncoding();
75  I.Fun.DeleteArgInfo    = false;
76  I.Fun.TypeQuals        = TypeQuals;
77  I.Fun.NumArgs          = NumArgs;
78  I.Fun.ArgInfo          = 0;
79  I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
80  I.Fun.RefQualifierLoc = RefQualifierLoc.getRawEncoding();
81  I.Fun.hasExceptionSpec = hasExceptionSpec;
82  I.Fun.ThrowLoc         = ThrowLoc.getRawEncoding();
83  I.Fun.hasAnyExceptionSpec = hasAnyExceptionSpec;
84  I.Fun.NumExceptions    = NumExceptions;
85  I.Fun.Exceptions       = 0;
86  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
87
88  // new[] an argument array if needed.
89  if (NumArgs) {
90    // If the 'InlineParams' in Declarator is unused and big enough, put our
91    // parameter list there (in an effort to avoid new/delete traffic).  If it
92    // is already used (consider a function returning a function pointer) or too
93    // small (function taking too many arguments), go to the heap.
94    if (!TheDeclarator.InlineParamsUsed &&
95        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
96      I.Fun.ArgInfo = TheDeclarator.InlineParams;
97      I.Fun.DeleteArgInfo = false;
98      TheDeclarator.InlineParamsUsed = true;
99    } else {
100      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
101      I.Fun.DeleteArgInfo = true;
102    }
103    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
104  }
105  // new[] an exception array if needed
106  if (NumExceptions) {
107    I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
108    for (unsigned i = 0; i != NumExceptions; ++i) {
109      I.Fun.Exceptions[i].Ty = Exceptions[i];
110      I.Fun.Exceptions[i].Range = ExceptionRanges[i];
111    }
112  }
113  return I;
114}
115
116/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
117/// declaration specifier includes.
118///
119unsigned DeclSpec::getParsedSpecifiers() const {
120  unsigned Res = 0;
121  if (StorageClassSpec != SCS_unspecified ||
122      SCS_thread_specified)
123    Res |= PQ_StorageClassSpecifier;
124
125  if (TypeQualifiers != TQ_unspecified)
126    Res |= PQ_TypeQualifier;
127
128  if (hasTypeSpecifier())
129    Res |= PQ_TypeSpecifier;
130
131  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
132    Res |= PQ_FunctionSpecifier;
133  return Res;
134}
135
136template <class T> static bool BadSpecifier(T TNew, T TPrev,
137                                            const char *&PrevSpec,
138                                            unsigned &DiagID) {
139  PrevSpec = DeclSpec::getSpecifierName(TPrev);
140  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
141            : diag::err_invalid_decl_spec_combination);
142  return true;
143}
144
145const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
146  switch (S) {
147  case DeclSpec::SCS_unspecified: return "unspecified";
148  case DeclSpec::SCS_typedef:     return "typedef";
149  case DeclSpec::SCS_extern:      return "extern";
150  case DeclSpec::SCS_static:      return "static";
151  case DeclSpec::SCS_auto:        return "auto";
152  case DeclSpec::SCS_register:    return "register";
153  case DeclSpec::SCS_private_extern: return "__private_extern__";
154  case DeclSpec::SCS_mutable:     return "mutable";
155  }
156  llvm_unreachable("Unknown typespec!");
157}
158
159const char *DeclSpec::getSpecifierName(TSW W) {
160  switch (W) {
161  case TSW_unspecified: return "unspecified";
162  case TSW_short:       return "short";
163  case TSW_long:        return "long";
164  case TSW_longlong:    return "long long";
165  }
166  llvm_unreachable("Unknown typespec!");
167}
168
169const char *DeclSpec::getSpecifierName(TSC C) {
170  switch (C) {
171  case TSC_unspecified: return "unspecified";
172  case TSC_imaginary:   return "imaginary";
173  case TSC_complex:     return "complex";
174  }
175  llvm_unreachable("Unknown typespec!");
176}
177
178
179const char *DeclSpec::getSpecifierName(TSS S) {
180  switch (S) {
181  case TSS_unspecified: return "unspecified";
182  case TSS_signed:      return "signed";
183  case TSS_unsigned:    return "unsigned";
184  }
185  llvm_unreachable("Unknown typespec!");
186}
187
188const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
189  switch (T) {
190  case DeclSpec::TST_unspecified: return "unspecified";
191  case DeclSpec::TST_void:        return "void";
192  case DeclSpec::TST_char:        return "char";
193  case DeclSpec::TST_wchar:       return "wchar_t";
194  case DeclSpec::TST_char16:      return "char16_t";
195  case DeclSpec::TST_char32:      return "char32_t";
196  case DeclSpec::TST_int:         return "int";
197  case DeclSpec::TST_float:       return "float";
198  case DeclSpec::TST_double:      return "double";
199  case DeclSpec::TST_bool:        return "_Bool";
200  case DeclSpec::TST_decimal32:   return "_Decimal32";
201  case DeclSpec::TST_decimal64:   return "_Decimal64";
202  case DeclSpec::TST_decimal128:  return "_Decimal128";
203  case DeclSpec::TST_enum:        return "enum";
204  case DeclSpec::TST_class:       return "class";
205  case DeclSpec::TST_union:       return "union";
206  case DeclSpec::TST_struct:      return "struct";
207  case DeclSpec::TST_typename:    return "type-name";
208  case DeclSpec::TST_typeofType:
209  case DeclSpec::TST_typeofExpr:  return "typeof";
210  case DeclSpec::TST_auto:        return "auto";
211  case DeclSpec::TST_decltype:    return "(decltype)";
212  case DeclSpec::TST_error:       return "(error)";
213  }
214  llvm_unreachable("Unknown typespec!");
215}
216
217const char *DeclSpec::getSpecifierName(TQ T) {
218  switch (T) {
219  case DeclSpec::TQ_unspecified: return "unspecified";
220  case DeclSpec::TQ_const:       return "const";
221  case DeclSpec::TQ_restrict:    return "restrict";
222  case DeclSpec::TQ_volatile:    return "volatile";
223  }
224  llvm_unreachable("Unknown typespec!");
225}
226
227bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
228                                   const char *&PrevSpec,
229                                   unsigned &DiagID,
230                                   const LangOptions &Lang) {
231  // OpenCL prohibits extern, auto, register, and static
232  // It seems sensible to prohibit private_extern too
233  if (Lang.OpenCL) {
234    switch (S) {
235    case SCS_extern:
236    case SCS_private_extern:
237    case SCS_auto:
238    case SCS_register:
239    case SCS_static:
240      DiagID   = diag::err_not_opencl_storage_class_specifier;
241      PrevSpec = getSpecifierName(S);
242      return true;
243    default:
244      break;
245    }
246  }
247
248  if (StorageClassSpec != SCS_unspecified) {
249    // Changing storage class is allowed only if the previous one
250    // was the 'extern' that is part of a linkage specification and
251    // the new storage class is 'typedef'.
252    if (!(SCS_extern_in_linkage_spec &&
253          StorageClassSpec == SCS_extern &&
254          S == SCS_typedef))
255      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
256  }
257  StorageClassSpec = S;
258  StorageClassSpecLoc = Loc;
259  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
260  return false;
261}
262
263bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
264                                         const char *&PrevSpec,
265                                         unsigned &DiagID) {
266  if (SCS_thread_specified) {
267    PrevSpec = "__thread";
268    DiagID = diag::ext_duplicate_declspec;
269    return true;
270  }
271  SCS_thread_specified = true;
272  SCS_threadLoc = Loc;
273  return false;
274}
275
276/// These methods set the specified attribute of the DeclSpec, but return true
277/// and ignore the request if invalid (e.g. "extern" then "auto" is
278/// specified).
279bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
280                                const char *&PrevSpec,
281                                unsigned &DiagID) {
282  if (TypeSpecWidth != TSW_unspecified &&
283      // Allow turning long -> long long.
284      (W != TSW_longlong || TypeSpecWidth != TSW_long))
285    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
286  TypeSpecWidth = W;
287  TSWLoc = Loc;
288  if (TypeAltiVecVector && !TypeAltiVecBool &&
289      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
290    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
291    DiagID = diag::warn_vector_long_decl_spec_combination;
292    return true;
293  }
294  return false;
295}
296
297bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
298                                  const char *&PrevSpec,
299                                  unsigned &DiagID) {
300  if (TypeSpecComplex != TSC_unspecified)
301    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
302  TypeSpecComplex = C;
303  TSCLoc = Loc;
304  return false;
305}
306
307bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
308                               const char *&PrevSpec,
309                               unsigned &DiagID) {
310  if (TypeSpecSign != TSS_unspecified)
311    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
312  TypeSpecSign = S;
313  TSSLoc = Loc;
314  return false;
315}
316
317bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
318                               const char *&PrevSpec,
319                               unsigned &DiagID,
320                               ParsedType Rep) {
321  assert(isTypeRep(T) && "T does not store a type");
322  assert(Rep && "no type provided!");
323  if (TypeSpecType != TST_unspecified) {
324    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
325    DiagID = diag::err_invalid_decl_spec_combination;
326    return true;
327  }
328  TypeSpecType = T;
329  TypeRep = Rep;
330  TSTLoc = Loc;
331  TypeSpecOwned = false;
332  return false;
333}
334
335bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
336                               const char *&PrevSpec,
337                               unsigned &DiagID,
338                               Expr *Rep) {
339  assert(isExprRep(T) && "T does not store an expr");
340  assert(Rep && "no expression provided!");
341  if (TypeSpecType != TST_unspecified) {
342    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
343    DiagID = diag::err_invalid_decl_spec_combination;
344    return true;
345  }
346  TypeSpecType = T;
347  ExprRep = Rep;
348  TSTLoc = Loc;
349  TypeSpecOwned = false;
350  return false;
351}
352
353bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
354                               const char *&PrevSpec,
355                               unsigned &DiagID,
356                               Decl *Rep, bool Owned) {
357  assert(isDeclRep(T) && "T does not store a decl");
358  // Unlike the other cases, we don't assert that we actually get a decl.
359
360  if (TypeSpecType != TST_unspecified) {
361    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
362    DiagID = diag::err_invalid_decl_spec_combination;
363    return true;
364  }
365  TypeSpecType = T;
366  DeclRep = Rep;
367  TSTLoc = Loc;
368  TypeSpecOwned = Owned;
369  return false;
370}
371
372bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
373                               const char *&PrevSpec,
374                               unsigned &DiagID) {
375  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
376         "rep required for these type-spec kinds!");
377  if (TypeSpecType != TST_unspecified) {
378    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
379    DiagID = diag::err_invalid_decl_spec_combination;
380    return true;
381  }
382  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
383    TypeAltiVecBool = true;
384    TSTLoc = Loc;
385    return false;
386  }
387  TypeSpecType = T;
388  TSTLoc = Loc;
389  TypeSpecOwned = false;
390  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
391    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
392    DiagID = diag::err_invalid_vector_decl_spec;
393    return true;
394  }
395  return false;
396}
397
398bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
399                          const char *&PrevSpec, unsigned &DiagID) {
400  if (TypeSpecType != TST_unspecified) {
401    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
402    DiagID = diag::err_invalid_vector_decl_spec_combination;
403    return true;
404  }
405  TypeAltiVecVector = isAltiVecVector;
406  AltiVecLoc = Loc;
407  return false;
408}
409
410bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
411                          const char *&PrevSpec, unsigned &DiagID) {
412  if (!TypeAltiVecVector || TypeAltiVecPixel ||
413      (TypeSpecType != TST_unspecified)) {
414    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
415    DiagID = diag::err_invalid_pixel_decl_spec_combination;
416    return true;
417  }
418  TypeAltiVecPixel = isAltiVecPixel;
419  TSTLoc = Loc;
420  return false;
421}
422
423bool DeclSpec::SetTypeSpecError() {
424  TypeSpecType = TST_error;
425  TypeSpecOwned = false;
426  TSTLoc = SourceLocation();
427  return false;
428}
429
430bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
431                           unsigned &DiagID, const LangOptions &Lang) {
432  // Duplicates turn into warnings pre-C99.
433  if ((TypeQualifiers & T) && !Lang.C99)
434    return BadSpecifier(T, T, PrevSpec, DiagID);
435  TypeQualifiers |= T;
436
437  switch (T) {
438  default: assert(0 && "Unknown type qualifier!");
439  case TQ_const:    TQ_constLoc = Loc; break;
440  case TQ_restrict: TQ_restrictLoc = Loc; break;
441  case TQ_volatile: TQ_volatileLoc = Loc; break;
442  }
443  return false;
444}
445
446bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
447                                     unsigned &DiagID) {
448  // 'inline inline' is ok.
449  FS_inline_specified = true;
450  FS_inlineLoc = Loc;
451  return false;
452}
453
454bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
455                                      unsigned &DiagID) {
456  // 'virtual virtual' is ok.
457  FS_virtual_specified = true;
458  FS_virtualLoc = Loc;
459  return false;
460}
461
462bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
463                                       unsigned &DiagID) {
464  // 'explicit explicit' is ok.
465  FS_explicit_specified = true;
466  FS_explicitLoc = Loc;
467  return false;
468}
469
470bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
471                             unsigned &DiagID) {
472  if (Friend_specified) {
473    PrevSpec = "friend";
474    DiagID = diag::ext_duplicate_declspec;
475    return true;
476  }
477
478  Friend_specified = true;
479  FriendLoc = Loc;
480  return false;
481}
482
483bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
484                                unsigned &DiagID) {
485  // 'constexpr constexpr' is ok.
486  Constexpr_specified = true;
487  ConstexprLoc = Loc;
488  return false;
489}
490
491void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
492                                     unsigned NP,
493                                     SourceLocation *ProtoLocs,
494                                     SourceLocation LAngleLoc) {
495  if (NP == 0) return;
496  ProtocolQualifiers = new Decl*[NP];
497  ProtocolLocs = new SourceLocation[NP];
498  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
499  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
500  NumProtocolQualifiers = NP;
501  ProtocolLAngleLoc = LAngleLoc;
502}
503
504void DeclSpec::SaveWrittenBuiltinSpecs() {
505  writtenBS.Sign = getTypeSpecSign();
506  writtenBS.Width = getTypeSpecWidth();
507  writtenBS.Type = getTypeSpecType();
508  // Search the list of attributes for the presence of a mode attribute.
509  writtenBS.ModeAttr = false;
510  AttributeList* attrs = getAttributes().getList();
511  while (attrs) {
512    if (attrs->getKind() == AttributeList::AT_mode) {
513      writtenBS.ModeAttr = true;
514      break;
515    }
516    attrs = attrs->getNext();
517  }
518}
519
520void DeclSpec::SaveStorageSpecifierAsWritten() {
521  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
522    // If 'extern' is part of a linkage specification,
523    // then it is not a storage class "as written".
524    StorageClassSpecAsWritten = SCS_unspecified;
525  else
526    StorageClassSpecAsWritten = StorageClassSpec;
527}
528
529/// Finish - This does final analysis of the declspec, rejecting things like
530/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
531/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
532/// DeclSpec is guaranteed self-consistent, even if an error occurred.
533void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
534  // Before possibly changing their values, save specs as written.
535  SaveWrittenBuiltinSpecs();
536  SaveStorageSpecifierAsWritten();
537
538  // Check the type specifier components first.
539
540  // Validate and finalize AltiVec vector declspec.
541  if (TypeAltiVecVector) {
542    if (TypeAltiVecBool) {
543      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
544      if (TypeSpecSign != TSS_unspecified) {
545        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
546          << getSpecifierName((TSS)TypeSpecSign);
547      }
548
549      // Only char/int are valid with vector bool. (PIM 2.1)
550      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
551           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
552        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
553          << (TypeAltiVecPixel ? "__pixel" :
554                                 getSpecifierName((TST)TypeSpecType));
555      }
556
557      // Only 'short' is valid with vector bool. (PIM 2.1)
558      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
559        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
560          << getSpecifierName((TSW)TypeSpecWidth);
561
562      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
563      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
564          (TypeSpecWidth != TSW_unspecified))
565        TypeSpecSign = TSS_unsigned;
566    }
567
568    if (TypeAltiVecPixel) {
569      //TODO: perform validation
570      TypeSpecType = TST_int;
571      TypeSpecSign = TSS_unsigned;
572      TypeSpecWidth = TSW_short;
573      TypeSpecOwned = false;
574    }
575  }
576
577  // signed/unsigned are only valid with int/char/wchar_t.
578  if (TypeSpecSign != TSS_unspecified) {
579    if (TypeSpecType == TST_unspecified)
580      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
581    else if (TypeSpecType != TST_int  &&
582             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
583      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
584        << getSpecifierName((TST)TypeSpecType);
585      // signed double -> double.
586      TypeSpecSign = TSS_unspecified;
587    }
588  }
589
590  // Validate the width of the type.
591  switch (TypeSpecWidth) {
592  case TSW_unspecified: break;
593  case TSW_short:    // short int
594  case TSW_longlong: // long long int
595    if (TypeSpecType == TST_unspecified)
596      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
597    else if (TypeSpecType != TST_int) {
598      Diag(D, TSWLoc,
599           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
600                                      : diag::err_invalid_longlong_spec)
601        <<  getSpecifierName((TST)TypeSpecType);
602      TypeSpecType = TST_int;
603      TypeSpecOwned = false;
604    }
605    break;
606  case TSW_long:  // long double, long int
607    if (TypeSpecType == TST_unspecified)
608      TypeSpecType = TST_int;  // long -> long int.
609    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
610      Diag(D, TSWLoc, diag::err_invalid_long_spec)
611        << getSpecifierName((TST)TypeSpecType);
612      TypeSpecType = TST_int;
613      TypeSpecOwned = false;
614    }
615    break;
616  }
617
618  // TODO: if the implementation does not implement _Complex or _Imaginary,
619  // disallow their use.  Need information about the backend.
620  if (TypeSpecComplex != TSC_unspecified) {
621    if (TypeSpecType == TST_unspecified) {
622      Diag(D, TSCLoc, diag::ext_plain_complex)
623        << FixItHint::CreateInsertion(
624                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
625                                                 " double");
626      TypeSpecType = TST_double;   // _Complex -> _Complex double.
627    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
628      // Note that this intentionally doesn't include _Complex _Bool.
629      Diag(D, TSTLoc, diag::ext_integer_complex);
630    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
631      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
632        << getSpecifierName((TST)TypeSpecType);
633      TypeSpecComplex = TSC_unspecified;
634    }
635  }
636
637  // C++ [class.friend]p6:
638  //   No storage-class-specifier shall appear in the decl-specifier-seq
639  //   of a friend declaration.
640  if (isFriendSpecified() && getStorageClassSpec()) {
641    DeclSpec::SCS SC = getStorageClassSpec();
642    const char *SpecName = getSpecifierName(SC);
643
644    SourceLocation SCLoc = getStorageClassSpecLoc();
645    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
646
647    Diag(D, SCLoc, diag::err_friend_storage_spec)
648      << SpecName
649      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
650
651    ClearStorageClassSpecs();
652  }
653
654  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
655
656  // Okay, now we can infer the real type.
657
658  // TODO: return "auto function" and other bad things based on the real type.
659
660  // 'data definition has no type or storage class'?
661}
662
663bool DeclSpec::isMissingDeclaratorOk() {
664  TST tst = getTypeSpecType();
665  return isDeclRep(tst) && getRepAsDecl() != 0 &&
666    StorageClassSpec != DeclSpec::SCS_typedef;
667}
668
669void UnqualifiedId::clear() {
670  if (Kind == IK_TemplateId)
671    TemplateId->Destroy();
672
673  Kind = IK_Identifier;
674  Identifier = 0;
675  StartLocation = SourceLocation();
676  EndLocation = SourceLocation();
677}
678
679void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
680                                          OverloadedOperatorKind Op,
681                                          SourceLocation SymbolLocations[3]) {
682  Kind = IK_OperatorFunctionId;
683  StartLocation = OperatorLoc;
684  EndLocation = OperatorLoc;
685  OperatorFunctionId.Operator = Op;
686  for (unsigned I = 0; I != 3; ++I) {
687    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
688
689    if (SymbolLocations[I].isValid())
690      EndLocation = SymbolLocations[I];
691  }
692}
693
694bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
695                                  const char *&PrevSpec) {
696  if (Specifiers & VS) {
697    PrevSpec = getSpecifierName(VS);
698    return true;
699  }
700
701  Specifiers |= VS;
702
703  switch (VS) {
704  default: assert(0 && "Unknown specifier!");
705  case VS_Override: VS_overrideLoc = Loc; break;
706  case VS_Final:    VS_finalLoc = Loc; break;
707  case VS_New:      VS_newLoc = Loc; break;
708  }
709
710  return false;
711}
712
713const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
714  switch (VS) {
715  default: assert(0 && "Unknown specifier");
716  case VS_Override: return "override";
717  case VS_Final: return "final";
718  case VS_New: return "new";
719  }
720}
721
722bool ClassVirtSpecifiers::SetSpecifier(Specifier CVS, SourceLocation Loc,
723                                       const char *&PrevSpec) {
724  if (Specifiers & CVS) {
725    PrevSpec = getSpecifierName(CVS);
726    return true;
727  }
728
729  Specifiers |= CVS;
730
731  switch (CVS) {
732  default: assert(0 && "Unknown specifier!");
733  case CVS_Final: CVS_finalLoc = Loc; break;
734  case CVS_Explicit: CVS_explicitLoc = Loc; break;
735  }
736
737  return false;
738}
739
740const char *ClassVirtSpecifiers::getSpecifierName(Specifier CVS) {
741  switch (CVS) {
742  default: assert(0 && "Unknown specifier");
743  case CVS_Final: return "final";
744  case CVS_Explicit: return "explicit";
745  }
746}
747
748