DeclSpec.cpp revision 9e46b8cfb3e6c6feab5664744f52f06a40f9566b 
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                              SourceManager &SrcMgr, unsigned DiagID) {
27  return D.Report(FullSourceLoc(Loc, SrcMgr), 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(bool hasProto, bool isVariadic,
50                                             SourceLocation EllipsisLoc,
51                                             ParamInfo *ArgInfo,
52                                             unsigned NumArgs,
53                                             unsigned TypeQuals,
54                                             bool hasExceptionSpec,
55                                             SourceLocation ThrowLoc,
56                                             bool hasAnyExceptionSpec,
57                                             ParsedType *Exceptions,
58                                             SourceRange *ExceptionRanges,
59                                             unsigned NumExceptions,
60                                             SourceLocation LPLoc,
61                                             SourceLocation RPLoc,
62                                             Declarator &TheDeclarator) {
63  DeclaratorChunk I;
64  I.Kind                 = Function;
65  I.Loc                  = LPLoc;
66  I.EndLoc               = RPLoc;
67  I.Fun.hasPrototype     = hasProto;
68  I.Fun.isVariadic       = isVariadic;
69  I.Fun.EllipsisLoc      = EllipsisLoc.getRawEncoding();
70  I.Fun.DeleteArgInfo    = false;
71  I.Fun.TypeQuals        = TypeQuals;
72  I.Fun.NumArgs          = NumArgs;
73  I.Fun.ArgInfo          = 0;
74  I.Fun.hasExceptionSpec = hasExceptionSpec;
75  I.Fun.ThrowLoc         = ThrowLoc.getRawEncoding();
76  I.Fun.hasAnyExceptionSpec = hasAnyExceptionSpec;
77  I.Fun.NumExceptions    = NumExceptions;
78  I.Fun.Exceptions       = 0;
79
80  // new[] an argument array if needed.
81  if (NumArgs) {
82    // If the 'InlineParams' in Declarator is unused and big enough, put our
83    // parameter list there (in an effort to avoid new/delete traffic).  If it
84    // is already used (consider a function returning a function pointer) or too
85    // small (function taking too many arguments), go to the heap.
86    if (!TheDeclarator.InlineParamsUsed &&
87        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
88      I.Fun.ArgInfo = TheDeclarator.InlineParams;
89      I.Fun.DeleteArgInfo = false;
90      TheDeclarator.InlineParamsUsed = true;
91    } else {
92      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
93      I.Fun.DeleteArgInfo = true;
94    }
95    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
96  }
97  // new[] an exception array if needed
98  if (NumExceptions) {
99    I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
100    for (unsigned i = 0; i != NumExceptions; ++i) {
101      I.Fun.Exceptions[i].Ty = Exceptions[i];
102      I.Fun.Exceptions[i].Range = ExceptionRanges[i];
103    }
104  }
105  return I;
106}
107
108/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
109/// declaration specifier includes.
110///
111unsigned DeclSpec::getParsedSpecifiers() const {
112  unsigned Res = 0;
113  if (StorageClassSpec != SCS_unspecified ||
114      SCS_thread_specified)
115    Res |= PQ_StorageClassSpecifier;
116
117  if (TypeQualifiers != TQ_unspecified)
118    Res |= PQ_TypeQualifier;
119
120  if (hasTypeSpecifier())
121    Res |= PQ_TypeSpecifier;
122
123  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
124    Res |= PQ_FunctionSpecifier;
125  return Res;
126}
127
128template <class T> static bool BadSpecifier(T TNew, T TPrev,
129                                            const char *&PrevSpec,
130                                            unsigned &DiagID) {
131  PrevSpec = DeclSpec::getSpecifierName(TPrev);
132  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
133            : diag::err_invalid_decl_spec_combination);
134  return true;
135}
136
137const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
138  switch (S) {
139  case DeclSpec::SCS_unspecified: return "unspecified";
140  case DeclSpec::SCS_typedef:     return "typedef";
141  case DeclSpec::SCS_extern:      return "extern";
142  case DeclSpec::SCS_static:      return "static";
143  case DeclSpec::SCS_auto:        return "auto";
144  case DeclSpec::SCS_register:    return "register";
145  case DeclSpec::SCS_private_extern: return "__private_extern__";
146  case DeclSpec::SCS_mutable:     return "mutable";
147  }
148  llvm_unreachable("Unknown typespec!");
149}
150
151const char *DeclSpec::getSpecifierName(TSW W) {
152  switch (W) {
153  case TSW_unspecified: return "unspecified";
154  case TSW_short:       return "short";
155  case TSW_long:        return "long";
156  case TSW_longlong:    return "long long";
157  }
158  llvm_unreachable("Unknown typespec!");
159}
160
161const char *DeclSpec::getSpecifierName(TSC C) {
162  switch (C) {
163  case TSC_unspecified: return "unspecified";
164  case TSC_imaginary:   return "imaginary";
165  case TSC_complex:     return "complex";
166  }
167  llvm_unreachable("Unknown typespec!");
168}
169
170
171const char *DeclSpec::getSpecifierName(TSS S) {
172  switch (S) {
173  case TSS_unspecified: return "unspecified";
174  case TSS_signed:      return "signed";
175  case TSS_unsigned:    return "unsigned";
176  }
177  llvm_unreachable("Unknown typespec!");
178}
179
180const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
181  switch (T) {
182  case DeclSpec::TST_unspecified: return "unspecified";
183  case DeclSpec::TST_void:        return "void";
184  case DeclSpec::TST_char:        return "char";
185  case DeclSpec::TST_wchar:       return "wchar_t";
186  case DeclSpec::TST_char16:      return "char16_t";
187  case DeclSpec::TST_char32:      return "char32_t";
188  case DeclSpec::TST_int:         return "int";
189  case DeclSpec::TST_float:       return "float";
190  case DeclSpec::TST_double:      return "double";
191  case DeclSpec::TST_bool:        return "_Bool";
192  case DeclSpec::TST_decimal32:   return "_Decimal32";
193  case DeclSpec::TST_decimal64:   return "_Decimal64";
194  case DeclSpec::TST_decimal128:  return "_Decimal128";
195  case DeclSpec::TST_enum:        return "enum";
196  case DeclSpec::TST_class:       return "class";
197  case DeclSpec::TST_union:       return "union";
198  case DeclSpec::TST_struct:      return "struct";
199  case DeclSpec::TST_typename:    return "type-name";
200  case DeclSpec::TST_typeofType:
201  case DeclSpec::TST_typeofExpr:  return "typeof";
202  case DeclSpec::TST_auto:        return "auto";
203  case DeclSpec::TST_decltype:    return "(decltype)";
204  case DeclSpec::TST_error:       return "(error)";
205  }
206  llvm_unreachable("Unknown typespec!");
207}
208
209const char *DeclSpec::getSpecifierName(TQ T) {
210  switch (T) {
211  case DeclSpec::TQ_unspecified: return "unspecified";
212  case DeclSpec::TQ_const:       return "const";
213  case DeclSpec::TQ_restrict:    return "restrict";
214  case DeclSpec::TQ_volatile:    return "volatile";
215  }
216  llvm_unreachable("Unknown typespec!");
217}
218
219bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
220                                   const char *&PrevSpec,
221                                   unsigned &DiagID) {
222  if (StorageClassSpec != SCS_unspecified) {
223    // Changing storage class is allowed only if the previous one
224    // was the 'extern' that is part of a linkage specification and
225    // the new storage class is 'typedef'.
226    if (!(SCS_extern_in_linkage_spec &&
227          StorageClassSpec == SCS_extern &&
228          S == SCS_typedef))
229      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
230  }
231  StorageClassSpec = S;
232  StorageClassSpecLoc = Loc;
233  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
234  return false;
235}
236
237bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
238                                         const char *&PrevSpec,
239                                         unsigned &DiagID) {
240  if (SCS_thread_specified) {
241    PrevSpec = "__thread";
242    DiagID = diag::ext_duplicate_declspec;
243    return true;
244  }
245  SCS_thread_specified = true;
246  SCS_threadLoc = Loc;
247  return false;
248}
249
250/// These methods set the specified attribute of the DeclSpec, but return true
251/// and ignore the request if invalid (e.g. "extern" then "auto" is
252/// specified).
253bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
254                                const char *&PrevSpec,
255                                unsigned &DiagID) {
256  if (TypeSpecWidth != TSW_unspecified &&
257      // Allow turning long -> long long.
258      (W != TSW_longlong || TypeSpecWidth != TSW_long))
259    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
260  TypeSpecWidth = W;
261  TSWLoc = Loc;
262  if (TypeAltiVecVector && !TypeAltiVecBool &&
263      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
264    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
265    DiagID = diag::warn_vector_long_decl_spec_combination;
266    return true;
267  }
268  return false;
269}
270
271bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
272                                  const char *&PrevSpec,
273                                  unsigned &DiagID) {
274  if (TypeSpecComplex != TSC_unspecified)
275    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
276  TypeSpecComplex = C;
277  TSCLoc = Loc;
278  return false;
279}
280
281bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
282                               const char *&PrevSpec,
283                               unsigned &DiagID) {
284  if (TypeSpecSign != TSS_unspecified)
285    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
286  TypeSpecSign = S;
287  TSSLoc = Loc;
288  return false;
289}
290
291bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
292                               const char *&PrevSpec,
293                               unsigned &DiagID,
294                               ParsedType Rep) {
295  assert(isTypeRep(T) && "T does not store a type");
296  assert(Rep && "no type provided!");
297  if (TypeSpecType != TST_unspecified) {
298    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
299    DiagID = diag::err_invalid_decl_spec_combination;
300    return true;
301  }
302  TypeSpecType = T;
303  TypeRep = Rep;
304  TSTLoc = Loc;
305  TypeSpecOwned = false;
306  return false;
307}
308
309bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
310                               const char *&PrevSpec,
311                               unsigned &DiagID,
312                               Expr *Rep) {
313  assert(isExprRep(T) && "T does not store an expr");
314  assert(Rep && "no expression provided!");
315  if (TypeSpecType != TST_unspecified) {
316    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
317    DiagID = diag::err_invalid_decl_spec_combination;
318    return true;
319  }
320  TypeSpecType = T;
321  ExprRep = Rep;
322  TSTLoc = Loc;
323  TypeSpecOwned = false;
324  return false;
325}
326
327bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
328                               const char *&PrevSpec,
329                               unsigned &DiagID,
330                               Decl *Rep, bool Owned) {
331  assert(isDeclRep(T) && "T does not store a decl");
332  // Unlike the other cases, we don't assert that we actually get a decl.
333
334  if (TypeSpecType != TST_unspecified) {
335    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
336    DiagID = diag::err_invalid_decl_spec_combination;
337    return true;
338  }
339  TypeSpecType = T;
340  DeclRep = Rep;
341  TSTLoc = Loc;
342  TypeSpecOwned = Owned;
343  return false;
344}
345
346bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
347                               const char *&PrevSpec,
348                               unsigned &DiagID) {
349  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
350         "rep required for these type-spec kinds!");
351  if (TypeSpecType != TST_unspecified) {
352    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
353    DiagID = diag::err_invalid_decl_spec_combination;
354    return true;
355  }
356  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
357    TypeAltiVecBool = true;
358    TSTLoc = Loc;
359    return false;
360  }
361  TypeSpecType = T;
362  TSTLoc = Loc;
363  TypeSpecOwned = false;
364  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
365    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
366    DiagID = diag::err_invalid_vector_decl_spec;
367    return true;
368  }
369  return false;
370}
371
372bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
373                          const char *&PrevSpec, unsigned &DiagID) {
374  if (TypeSpecType != TST_unspecified) {
375    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
376    DiagID = diag::err_invalid_vector_decl_spec_combination;
377    return true;
378  }
379  TypeAltiVecVector = isAltiVecVector;
380  AltiVecLoc = Loc;
381  return false;
382}
383
384bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
385                          const char *&PrevSpec, unsigned &DiagID) {
386  if (!TypeAltiVecVector || TypeAltiVecPixel ||
387      (TypeSpecType != TST_unspecified)) {
388    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
389    DiagID = diag::err_invalid_pixel_decl_spec_combination;
390    return true;
391  }
392  TypeAltiVecPixel = isAltiVecPixel;
393  TSTLoc = Loc;
394  return false;
395}
396
397bool DeclSpec::SetTypeSpecError() {
398  TypeSpecType = TST_error;
399  TypeSpecOwned = false;
400  TSTLoc = SourceLocation();
401  return false;
402}
403
404bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
405                           unsigned &DiagID, const LangOptions &Lang) {
406  // Duplicates turn into warnings pre-C99.
407  if ((TypeQualifiers & T) && !Lang.C99)
408    return BadSpecifier(T, T, PrevSpec, DiagID);
409  TypeQualifiers |= T;
410
411  switch (T) {
412  default: assert(0 && "Unknown type qualifier!");
413  case TQ_const:    TQ_constLoc = Loc; break;
414  case TQ_restrict: TQ_restrictLoc = Loc; break;
415  case TQ_volatile: TQ_volatileLoc = Loc; break;
416  }
417  return false;
418}
419
420bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
421                                     unsigned &DiagID) {
422  // 'inline inline' is ok.
423  FS_inline_specified = true;
424  FS_inlineLoc = Loc;
425  return false;
426}
427
428bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
429                                      unsigned &DiagID) {
430  // 'virtual virtual' is ok.
431  FS_virtual_specified = true;
432  FS_virtualLoc = Loc;
433  return false;
434}
435
436bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
437                                       unsigned &DiagID) {
438  // 'explicit explicit' is ok.
439  FS_explicit_specified = true;
440  FS_explicitLoc = Loc;
441  return false;
442}
443
444bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
445                             unsigned &DiagID) {
446  if (Friend_specified) {
447    PrevSpec = "friend";
448    DiagID = diag::ext_duplicate_declspec;
449    return true;
450  }
451
452  Friend_specified = true;
453  FriendLoc = Loc;
454  return false;
455}
456
457bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
458                                unsigned &DiagID) {
459  // 'constexpr constexpr' is ok.
460  Constexpr_specified = true;
461  ConstexprLoc = Loc;
462  return false;
463}
464
465void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
466                                     unsigned NP,
467                                     SourceLocation *ProtoLocs,
468                                     SourceLocation LAngleLoc) {
469  if (NP == 0) return;
470  ProtocolQualifiers = new Decl*[NP];
471  ProtocolLocs = new SourceLocation[NP];
472  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
473  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
474  NumProtocolQualifiers = NP;
475  ProtocolLAngleLoc = LAngleLoc;
476}
477
478void DeclSpec::SaveWrittenBuiltinSpecs() {
479  writtenBS.Sign = getTypeSpecSign();
480  writtenBS.Width = getTypeSpecWidth();
481  writtenBS.Type = getTypeSpecType();
482  // Search the list of attributes for the presence of a mode attribute.
483  writtenBS.ModeAttr = false;
484  AttributeList* attrs = getAttributes();
485  while (attrs) {
486    if (attrs->getKind() == AttributeList::AT_mode) {
487      writtenBS.ModeAttr = true;
488      break;
489    }
490    attrs = attrs->getNext();
491  }
492}
493
494void DeclSpec::SaveStorageSpecifierAsWritten() {
495  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
496    // If 'extern' is part of a linkage specification,
497    // then it is not a storage class "as written".
498    StorageClassSpecAsWritten = SCS_unspecified;
499  else
500    StorageClassSpecAsWritten = StorageClassSpec;
501}
502
503/// Finish - This does final analysis of the declspec, rejecting things like
504/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
505/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
506/// DeclSpec is guaranteed self-consistent, even if an error occurred.
507void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
508  // Before possibly changing their values, save specs as written.
509  SaveWrittenBuiltinSpecs();
510  SaveStorageSpecifierAsWritten();
511
512  // Check the type specifier components first.
513  SourceManager &SrcMgr = PP.getSourceManager();
514
515  // Validate and finalize AltiVec vector declspec.
516  if (TypeAltiVecVector) {
517    if (TypeAltiVecBool) {
518      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
519      if (TypeSpecSign != TSS_unspecified) {
520        Diag(D, TSSLoc, SrcMgr, diag::err_invalid_vector_bool_decl_spec)
521          << getSpecifierName((TSS)TypeSpecSign);
522      }
523
524      // Only char/int are valid with vector bool. (PIM 2.1)
525      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
526           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
527        Diag(D, TSTLoc, SrcMgr, diag::err_invalid_vector_bool_decl_spec)
528          << (TypeAltiVecPixel ? "__pixel" :
529                                 getSpecifierName((TST)TypeSpecType));
530      }
531
532      // Only 'short' is valid with vector bool. (PIM 2.1)
533      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
534        Diag(D, TSWLoc, SrcMgr, diag::err_invalid_vector_bool_decl_spec)
535          << getSpecifierName((TSW)TypeSpecWidth);
536
537      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
538      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
539          (TypeSpecWidth != TSW_unspecified))
540        TypeSpecSign = TSS_unsigned;
541    }
542
543    if (TypeAltiVecPixel) {
544      //TODO: perform validation
545      TypeSpecType = TST_int;
546      TypeSpecSign = TSS_unsigned;
547      TypeSpecWidth = TSW_short;
548      TypeSpecOwned = false;
549    }
550  }
551
552  // signed/unsigned are only valid with int/char/wchar_t.
553  if (TypeSpecSign != TSS_unspecified) {
554    if (TypeSpecType == TST_unspecified)
555      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
556    else if (TypeSpecType != TST_int  &&
557             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
558      Diag(D, TSSLoc, SrcMgr, diag::err_invalid_sign_spec)
559        << getSpecifierName((TST)TypeSpecType);
560      // signed double -> double.
561      TypeSpecSign = TSS_unspecified;
562    }
563  }
564
565  // Validate the width of the type.
566  switch (TypeSpecWidth) {
567  case TSW_unspecified: break;
568  case TSW_short:    // short int
569  case TSW_longlong: // long long int
570    if (TypeSpecType == TST_unspecified)
571      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
572    else if (TypeSpecType != TST_int) {
573      Diag(D, TSWLoc, SrcMgr,
574           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
575                                      : diag::err_invalid_longlong_spec)
576        <<  getSpecifierName((TST)TypeSpecType);
577      TypeSpecType = TST_int;
578      TypeSpecOwned = false;
579    }
580    break;
581  case TSW_long:  // long double, long int
582    if (TypeSpecType == TST_unspecified)
583      TypeSpecType = TST_int;  // long -> long int.
584    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
585      Diag(D, TSWLoc, SrcMgr, diag::err_invalid_long_spec)
586        << getSpecifierName((TST)TypeSpecType);
587      TypeSpecType = TST_int;
588      TypeSpecOwned = false;
589    }
590    break;
591  }
592
593  // TODO: if the implementation does not implement _Complex or _Imaginary,
594  // disallow their use.  Need information about the backend.
595  if (TypeSpecComplex != TSC_unspecified) {
596    if (TypeSpecType == TST_unspecified) {
597      Diag(D, TSCLoc, SrcMgr, diag::ext_plain_complex)
598        << FixItHint::CreateInsertion(
599                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
600                                                 " double");
601      TypeSpecType = TST_double;   // _Complex -> _Complex double.
602    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
603      // Note that this intentionally doesn't include _Complex _Bool.
604      Diag(D, TSTLoc, SrcMgr, diag::ext_integer_complex);
605    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
606      Diag(D, TSCLoc, SrcMgr, diag::err_invalid_complex_spec)
607        << getSpecifierName((TST)TypeSpecType);
608      TypeSpecComplex = TSC_unspecified;
609    }
610  }
611
612  // C++ [class.friend]p6:
613  //   No storage-class-specifier shall appear in the decl-specifier-seq
614  //   of a friend declaration.
615  if (isFriendSpecified() && getStorageClassSpec()) {
616    DeclSpec::SCS SC = getStorageClassSpec();
617    const char *SpecName = getSpecifierName(SC);
618
619    SourceLocation SCLoc = getStorageClassSpecLoc();
620    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
621
622    Diag(D, SCLoc, SrcMgr, diag::err_friend_storage_spec)
623      << SpecName
624      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
625
626    ClearStorageClassSpecs();
627  }
628
629  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
630
631  // Okay, now we can infer the real type.
632
633  // TODO: return "auto function" and other bad things based on the real type.
634
635  // 'data definition has no type or storage class'?
636}
637
638bool DeclSpec::isMissingDeclaratorOk() {
639  TST tst = getTypeSpecType();
640  return isDeclRep(tst) && getRepAsDecl() != 0 &&
641    StorageClassSpec != DeclSpec::SCS_typedef;
642}
643
644void UnqualifiedId::clear() {
645  if (Kind == IK_TemplateId)
646    TemplateId->Destroy();
647
648  Kind = IK_Identifier;
649  Identifier = 0;
650  StartLocation = SourceLocation();
651  EndLocation = SourceLocation();
652}
653
654void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
655                                          OverloadedOperatorKind Op,
656                                          SourceLocation SymbolLocations[3]) {
657  Kind = IK_OperatorFunctionId;
658  StartLocation = OperatorLoc;
659  EndLocation = OperatorLoc;
660  OperatorFunctionId.Operator = Op;
661  for (unsigned I = 0; I != 3; ++I) {
662    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
663
664    if (SymbolLocations[I].isValid())
665      EndLocation = SymbolLocations[I];
666  }
667}
668