DeclSpec.cpp revision c46bb7d098bf9e9f0258bf2bb97d8f0f7d382288 
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 hasExceptionSpec,
56                                             SourceLocation ThrowLoc,
57                                             bool hasAnyExceptionSpec,
58                                             ParsedType *Exceptions,
59                                             SourceRange *ExceptionRanges,
60                                             unsigned NumExceptions,
61                                             SourceLocation LPLoc,
62                                             SourceLocation RPLoc,
63                                             Declarator &TheDeclarator,
64                                             ParsedType TrailingReturnType) {
65  DeclaratorChunk I;
66  I.Kind                 = Function;
67  I.Loc                  = LPLoc;
68  I.EndLoc               = RPLoc;
69  I.Fun.AttrList         = attrs.getList();
70  I.Fun.hasPrototype     = hasProto;
71  I.Fun.isVariadic       = isVariadic;
72  I.Fun.EllipsisLoc      = EllipsisLoc.getRawEncoding();
73  I.Fun.DeleteArgInfo    = false;
74  I.Fun.TypeQuals        = TypeQuals;
75  I.Fun.NumArgs          = NumArgs;
76  I.Fun.ArgInfo          = 0;
77  I.Fun.hasExceptionSpec = hasExceptionSpec;
78  I.Fun.ThrowLoc         = ThrowLoc.getRawEncoding();
79  I.Fun.hasAnyExceptionSpec = hasAnyExceptionSpec;
80  I.Fun.NumExceptions    = NumExceptions;
81  I.Fun.Exceptions       = 0;
82  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
83
84  // new[] an argument array if needed.
85  if (NumArgs) {
86    // If the 'InlineParams' in Declarator is unused and big enough, put our
87    // parameter list there (in an effort to avoid new/delete traffic).  If it
88    // is already used (consider a function returning a function pointer) or too
89    // small (function taking too many arguments), go to the heap.
90    if (!TheDeclarator.InlineParamsUsed &&
91        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
92      I.Fun.ArgInfo = TheDeclarator.InlineParams;
93      I.Fun.DeleteArgInfo = false;
94      TheDeclarator.InlineParamsUsed = true;
95    } else {
96      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
97      I.Fun.DeleteArgInfo = true;
98    }
99    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
100  }
101  // new[] an exception array if needed
102  if (NumExceptions) {
103    I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
104    for (unsigned i = 0; i != NumExceptions; ++i) {
105      I.Fun.Exceptions[i].Ty = Exceptions[i];
106      I.Fun.Exceptions[i].Range = ExceptionRanges[i];
107    }
108  }
109  return I;
110}
111
112/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
113/// declaration specifier includes.
114///
115unsigned DeclSpec::getParsedSpecifiers() const {
116  unsigned Res = 0;
117  if (StorageClassSpec != SCS_unspecified ||
118      SCS_thread_specified)
119    Res |= PQ_StorageClassSpecifier;
120
121  if (TypeQualifiers != TQ_unspecified)
122    Res |= PQ_TypeQualifier;
123
124  if (hasTypeSpecifier())
125    Res |= PQ_TypeSpecifier;
126
127  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
128    Res |= PQ_FunctionSpecifier;
129  return Res;
130}
131
132template <class T> static bool BadSpecifier(T TNew, T TPrev,
133                                            const char *&PrevSpec,
134                                            unsigned &DiagID) {
135  PrevSpec = DeclSpec::getSpecifierName(TPrev);
136  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
137            : diag::err_invalid_decl_spec_combination);
138  return true;
139}
140
141const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
142  switch (S) {
143  case DeclSpec::SCS_unspecified: return "unspecified";
144  case DeclSpec::SCS_typedef:     return "typedef";
145  case DeclSpec::SCS_extern:      return "extern";
146  case DeclSpec::SCS_static:      return "static";
147  case DeclSpec::SCS_auto:        return "auto";
148  case DeclSpec::SCS_register:    return "register";
149  case DeclSpec::SCS_private_extern: return "__private_extern__";
150  case DeclSpec::SCS_mutable:     return "mutable";
151  }
152  llvm_unreachable("Unknown typespec!");
153}
154
155const char *DeclSpec::getSpecifierName(TSW W) {
156  switch (W) {
157  case TSW_unspecified: return "unspecified";
158  case TSW_short:       return "short";
159  case TSW_long:        return "long";
160  case TSW_longlong:    return "long long";
161  }
162  llvm_unreachable("Unknown typespec!");
163}
164
165const char *DeclSpec::getSpecifierName(TSC C) {
166  switch (C) {
167  case TSC_unspecified: return "unspecified";
168  case TSC_imaginary:   return "imaginary";
169  case TSC_complex:     return "complex";
170  }
171  llvm_unreachable("Unknown typespec!");
172}
173
174
175const char *DeclSpec::getSpecifierName(TSS S) {
176  switch (S) {
177  case TSS_unspecified: return "unspecified";
178  case TSS_signed:      return "signed";
179  case TSS_unsigned:    return "unsigned";
180  }
181  llvm_unreachable("Unknown typespec!");
182}
183
184const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
185  switch (T) {
186  case DeclSpec::TST_unspecified: return "unspecified";
187  case DeclSpec::TST_void:        return "void";
188  case DeclSpec::TST_char:        return "char";
189  case DeclSpec::TST_wchar:       return "wchar_t";
190  case DeclSpec::TST_char16:      return "char16_t";
191  case DeclSpec::TST_char32:      return "char32_t";
192  case DeclSpec::TST_int:         return "int";
193  case DeclSpec::TST_float:       return "float";
194  case DeclSpec::TST_double:      return "double";
195  case DeclSpec::TST_bool:        return "_Bool";
196  case DeclSpec::TST_decimal32:   return "_Decimal32";
197  case DeclSpec::TST_decimal64:   return "_Decimal64";
198  case DeclSpec::TST_decimal128:  return "_Decimal128";
199  case DeclSpec::TST_enum:        return "enum";
200  case DeclSpec::TST_class:       return "class";
201  case DeclSpec::TST_union:       return "union";
202  case DeclSpec::TST_struct:      return "struct";
203  case DeclSpec::TST_typename:    return "type-name";
204  case DeclSpec::TST_typeofType:
205  case DeclSpec::TST_typeofExpr:  return "typeof";
206  case DeclSpec::TST_auto:        return "auto";
207  case DeclSpec::TST_decltype:    return "(decltype)";
208  case DeclSpec::TST_error:       return "(error)";
209  }
210  llvm_unreachable("Unknown typespec!");
211}
212
213const char *DeclSpec::getSpecifierName(TQ T) {
214  switch (T) {
215  case DeclSpec::TQ_unspecified: return "unspecified";
216  case DeclSpec::TQ_const:       return "const";
217  case DeclSpec::TQ_restrict:    return "restrict";
218  case DeclSpec::TQ_volatile:    return "volatile";
219  }
220  llvm_unreachable("Unknown typespec!");
221}
222
223bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
224                                   const char *&PrevSpec,
225                                   unsigned &DiagID) {
226  if (StorageClassSpec != SCS_unspecified) {
227    // Changing storage class is allowed only if the previous one
228    // was the 'extern' that is part of a linkage specification and
229    // the new storage class is 'typedef'.
230    if (!(SCS_extern_in_linkage_spec &&
231          StorageClassSpec == SCS_extern &&
232          S == SCS_typedef))
233      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
234  }
235  StorageClassSpec = S;
236  StorageClassSpecLoc = Loc;
237  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
238  return false;
239}
240
241bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
242                                         const char *&PrevSpec,
243                                         unsigned &DiagID) {
244  if (SCS_thread_specified) {
245    PrevSpec = "__thread";
246    DiagID = diag::ext_duplicate_declspec;
247    return true;
248  }
249  SCS_thread_specified = true;
250  SCS_threadLoc = Loc;
251  return false;
252}
253
254/// These methods set the specified attribute of the DeclSpec, but return true
255/// and ignore the request if invalid (e.g. "extern" then "auto" is
256/// specified).
257bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
258                                const char *&PrevSpec,
259                                unsigned &DiagID) {
260  if (TypeSpecWidth != TSW_unspecified &&
261      // Allow turning long -> long long.
262      (W != TSW_longlong || TypeSpecWidth != TSW_long))
263    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
264  TypeSpecWidth = W;
265  TSWLoc = Loc;
266  if (TypeAltiVecVector && !TypeAltiVecBool &&
267      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
268    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
269    DiagID = diag::warn_vector_long_decl_spec_combination;
270    return true;
271  }
272  return false;
273}
274
275bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
276                                  const char *&PrevSpec,
277                                  unsigned &DiagID) {
278  if (TypeSpecComplex != TSC_unspecified)
279    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
280  TypeSpecComplex = C;
281  TSCLoc = Loc;
282  return false;
283}
284
285bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
286                               const char *&PrevSpec,
287                               unsigned &DiagID) {
288  if (TypeSpecSign != TSS_unspecified)
289    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
290  TypeSpecSign = S;
291  TSSLoc = Loc;
292  return false;
293}
294
295bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
296                               const char *&PrevSpec,
297                               unsigned &DiagID,
298                               ParsedType Rep) {
299  assert(isTypeRep(T) && "T does not store a type");
300  assert(Rep && "no type provided!");
301  if (TypeSpecType != TST_unspecified) {
302    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
303    DiagID = diag::err_invalid_decl_spec_combination;
304    return true;
305  }
306  TypeSpecType = T;
307  TypeRep = Rep;
308  TSTLoc = Loc;
309  TypeSpecOwned = false;
310  return false;
311}
312
313bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
314                               const char *&PrevSpec,
315                               unsigned &DiagID,
316                               Expr *Rep) {
317  assert(isExprRep(T) && "T does not store an expr");
318  assert(Rep && "no expression provided!");
319  if (TypeSpecType != TST_unspecified) {
320    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
321    DiagID = diag::err_invalid_decl_spec_combination;
322    return true;
323  }
324  TypeSpecType = T;
325  ExprRep = Rep;
326  TSTLoc = Loc;
327  TypeSpecOwned = false;
328  return false;
329}
330
331bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
332                               const char *&PrevSpec,
333                               unsigned &DiagID,
334                               Decl *Rep, bool Owned) {
335  assert(isDeclRep(T) && "T does not store a decl");
336  // Unlike the other cases, we don't assert that we actually get a decl.
337
338  if (TypeSpecType != TST_unspecified) {
339    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
340    DiagID = diag::err_invalid_decl_spec_combination;
341    return true;
342  }
343  TypeSpecType = T;
344  DeclRep = Rep;
345  TSTLoc = Loc;
346  TypeSpecOwned = Owned;
347  return false;
348}
349
350bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
351                               const char *&PrevSpec,
352                               unsigned &DiagID) {
353  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
354         "rep required for these type-spec kinds!");
355  if (TypeSpecType != TST_unspecified) {
356    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
357    DiagID = diag::err_invalid_decl_spec_combination;
358    return true;
359  }
360  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
361    TypeAltiVecBool = true;
362    TSTLoc = Loc;
363    return false;
364  }
365  TypeSpecType = T;
366  TSTLoc = Loc;
367  TypeSpecOwned = false;
368  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
369    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
370    DiagID = diag::err_invalid_vector_decl_spec;
371    return true;
372  }
373  return false;
374}
375
376bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
377                          const char *&PrevSpec, unsigned &DiagID) {
378  if (TypeSpecType != TST_unspecified) {
379    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
380    DiagID = diag::err_invalid_vector_decl_spec_combination;
381    return true;
382  }
383  TypeAltiVecVector = isAltiVecVector;
384  AltiVecLoc = Loc;
385  return false;
386}
387
388bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
389                          const char *&PrevSpec, unsigned &DiagID) {
390  if (!TypeAltiVecVector || TypeAltiVecPixel ||
391      (TypeSpecType != TST_unspecified)) {
392    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
393    DiagID = diag::err_invalid_pixel_decl_spec_combination;
394    return true;
395  }
396  TypeAltiVecPixel = isAltiVecPixel;
397  TSTLoc = Loc;
398  return false;
399}
400
401bool DeclSpec::SetTypeSpecError() {
402  TypeSpecType = TST_error;
403  TypeSpecOwned = false;
404  TSTLoc = SourceLocation();
405  return false;
406}
407
408bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
409                           unsigned &DiagID, const LangOptions &Lang) {
410  // Duplicates turn into warnings pre-C99.
411  if ((TypeQualifiers & T) && !Lang.C99)
412    return BadSpecifier(T, T, PrevSpec, DiagID);
413  TypeQualifiers |= T;
414
415  switch (T) {
416  default: assert(0 && "Unknown type qualifier!");
417  case TQ_const:    TQ_constLoc = Loc; break;
418  case TQ_restrict: TQ_restrictLoc = Loc; break;
419  case TQ_volatile: TQ_volatileLoc = Loc; break;
420  }
421  return false;
422}
423
424bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
425                                     unsigned &DiagID) {
426  // 'inline inline' is ok.
427  FS_inline_specified = true;
428  FS_inlineLoc = Loc;
429  return false;
430}
431
432bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
433                                      unsigned &DiagID) {
434  // 'virtual virtual' is ok.
435  FS_virtual_specified = true;
436  FS_virtualLoc = Loc;
437  return false;
438}
439
440bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
441                                       unsigned &DiagID) {
442  // 'explicit explicit' is ok.
443  FS_explicit_specified = true;
444  FS_explicitLoc = Loc;
445  return false;
446}
447
448bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
449                             unsigned &DiagID) {
450  if (Friend_specified) {
451    PrevSpec = "friend";
452    DiagID = diag::ext_duplicate_declspec;
453    return true;
454  }
455
456  Friend_specified = true;
457  FriendLoc = Loc;
458  return false;
459}
460
461bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
462                                unsigned &DiagID) {
463  // 'constexpr constexpr' is ok.
464  Constexpr_specified = true;
465  ConstexprLoc = Loc;
466  return false;
467}
468
469void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
470                                     unsigned NP,
471                                     SourceLocation *ProtoLocs,
472                                     SourceLocation LAngleLoc) {
473  if (NP == 0) return;
474  ProtocolQualifiers = new Decl*[NP];
475  ProtocolLocs = new SourceLocation[NP];
476  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
477  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
478  NumProtocolQualifiers = NP;
479  ProtocolLAngleLoc = LAngleLoc;
480}
481
482void DeclSpec::SaveWrittenBuiltinSpecs() {
483  writtenBS.Sign = getTypeSpecSign();
484  writtenBS.Width = getTypeSpecWidth();
485  writtenBS.Type = getTypeSpecType();
486  // Search the list of attributes for the presence of a mode attribute.
487  writtenBS.ModeAttr = false;
488  AttributeList* attrs = getAttributes().getList();
489  while (attrs) {
490    if (attrs->getKind() == AttributeList::AT_mode) {
491      writtenBS.ModeAttr = true;
492      break;
493    }
494    attrs = attrs->getNext();
495  }
496}
497
498void DeclSpec::SaveStorageSpecifierAsWritten() {
499  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
500    // If 'extern' is part of a linkage specification,
501    // then it is not a storage class "as written".
502    StorageClassSpecAsWritten = SCS_unspecified;
503  else
504    StorageClassSpecAsWritten = StorageClassSpec;
505}
506
507/// Finish - This does final analysis of the declspec, rejecting things like
508/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
509/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
510/// DeclSpec is guaranteed self-consistent, even if an error occurred.
511void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
512  // Before possibly changing their values, save specs as written.
513  SaveWrittenBuiltinSpecs();
514  SaveStorageSpecifierAsWritten();
515
516  // Check the type specifier components first.
517
518  // Validate and finalize AltiVec vector declspec.
519  if (TypeAltiVecVector) {
520    if (TypeAltiVecBool) {
521      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
522      if (TypeSpecSign != TSS_unspecified) {
523        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
524          << getSpecifierName((TSS)TypeSpecSign);
525      }
526
527      // Only char/int are valid with vector bool. (PIM 2.1)
528      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
529           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
530        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
531          << (TypeAltiVecPixel ? "__pixel" :
532                                 getSpecifierName((TST)TypeSpecType));
533      }
534
535      // Only 'short' is valid with vector bool. (PIM 2.1)
536      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
537        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
538          << getSpecifierName((TSW)TypeSpecWidth);
539
540      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
541      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
542          (TypeSpecWidth != TSW_unspecified))
543        TypeSpecSign = TSS_unsigned;
544    }
545
546    if (TypeAltiVecPixel) {
547      //TODO: perform validation
548      TypeSpecType = TST_int;
549      TypeSpecSign = TSS_unsigned;
550      TypeSpecWidth = TSW_short;
551      TypeSpecOwned = false;
552    }
553  }
554
555  // signed/unsigned are only valid with int/char/wchar_t.
556  if (TypeSpecSign != TSS_unspecified) {
557    if (TypeSpecType == TST_unspecified)
558      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
559    else if (TypeSpecType != TST_int  &&
560             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
561      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
562        << getSpecifierName((TST)TypeSpecType);
563      // signed double -> double.
564      TypeSpecSign = TSS_unspecified;
565    }
566  }
567
568  // Validate the width of the type.
569  switch (TypeSpecWidth) {
570  case TSW_unspecified: break;
571  case TSW_short:    // short int
572  case TSW_longlong: // long long int
573    if (TypeSpecType == TST_unspecified)
574      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
575    else if (TypeSpecType != TST_int) {
576      Diag(D, TSWLoc,
577           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
578                                      : diag::err_invalid_longlong_spec)
579        <<  getSpecifierName((TST)TypeSpecType);
580      TypeSpecType = TST_int;
581      TypeSpecOwned = false;
582    }
583    break;
584  case TSW_long:  // long double, long int
585    if (TypeSpecType == TST_unspecified)
586      TypeSpecType = TST_int;  // long -> long int.
587    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
588      Diag(D, TSWLoc, diag::err_invalid_long_spec)
589        << getSpecifierName((TST)TypeSpecType);
590      TypeSpecType = TST_int;
591      TypeSpecOwned = false;
592    }
593    break;
594  }
595
596  // TODO: if the implementation does not implement _Complex or _Imaginary,
597  // disallow their use.  Need information about the backend.
598  if (TypeSpecComplex != TSC_unspecified) {
599    if (TypeSpecType == TST_unspecified) {
600      Diag(D, TSCLoc, diag::ext_plain_complex)
601        << FixItHint::CreateInsertion(
602                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
603                                                 " double");
604      TypeSpecType = TST_double;   // _Complex -> _Complex double.
605    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
606      // Note that this intentionally doesn't include _Complex _Bool.
607      Diag(D, TSTLoc, diag::ext_integer_complex);
608    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
609      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
610        << getSpecifierName((TST)TypeSpecType);
611      TypeSpecComplex = TSC_unspecified;
612    }
613  }
614
615  // C++ [class.friend]p6:
616  //   No storage-class-specifier shall appear in the decl-specifier-seq
617  //   of a friend declaration.
618  if (isFriendSpecified() && getStorageClassSpec()) {
619    DeclSpec::SCS SC = getStorageClassSpec();
620    const char *SpecName = getSpecifierName(SC);
621
622    SourceLocation SCLoc = getStorageClassSpecLoc();
623    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
624
625    Diag(D, SCLoc, diag::err_friend_storage_spec)
626      << SpecName
627      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
628
629    ClearStorageClassSpecs();
630  }
631
632  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
633
634  // Okay, now we can infer the real type.
635
636  // TODO: return "auto function" and other bad things based on the real type.
637
638  // 'data definition has no type or storage class'?
639}
640
641bool DeclSpec::isMissingDeclaratorOk() {
642  TST tst = getTypeSpecType();
643  return isDeclRep(tst) && getRepAsDecl() != 0 &&
644    StorageClassSpec != DeclSpec::SCS_typedef;
645}
646
647void UnqualifiedId::clear() {
648  if (Kind == IK_TemplateId)
649    TemplateId->Destroy();
650
651  Kind = IK_Identifier;
652  Identifier = 0;
653  StartLocation = SourceLocation();
654  EndLocation = SourceLocation();
655}
656
657void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
658                                          OverloadedOperatorKind Op,
659                                          SourceLocation SymbolLocations[3]) {
660  Kind = IK_OperatorFunctionId;
661  StartLocation = OperatorLoc;
662  EndLocation = OperatorLoc;
663  OperatorFunctionId.Operator = Op;
664  for (unsigned I = 0; I != 3; ++I) {
665    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
666
667    if (SymbolLocations[I].isValid())
668      EndLocation = SymbolLocations[I];
669  }
670}
671
672bool VirtSpecifiers::SetVirtSpecifier(VirtSpecifier VS, SourceLocation Loc,
673                                      const char *&PrevSpec) {
674  if (Specifiers & VS) {
675    PrevSpec = getSpecifierName(VS);
676    return true;
677  }
678
679  Specifiers |= VS;
680
681  switch (VS) {
682  default: assert(0 && "Unknown specifier!");
683  case VS_Override: VS_overrideLoc = Loc; break;
684  case VS_Final:    VS_finalLoc = Loc; break;
685  case VS_New:      VS_newLoc = Loc; break;
686  }
687  return false;
688}
689
690const char *VirtSpecifiers::getSpecifierName(VirtSpecifier VS) {
691  switch (VS) {
692  default: assert(0 && "Unknown specifier");
693  case VS_Override: return "override";
694  case VS_Final: return "final";
695  case VS_New: return "new";
696  }
697}
698