DeclSpec.cpp revision ca63c200346c0ca9e00194ec6e34a5a7b0ed9321 
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/AST/ASTContext.h"
18#include "clang/AST/NestedNameSpecifier.h"
19#include "clang/AST/TypeLoc.h"
20#include "clang/Lex/Preprocessor.h"
21#include "clang/Basic/LangOptions.h"
22#include "llvm/ADT/STLExtras.h"
23#include "llvm/Support/ErrorHandling.h"
24#include <cstring>
25using namespace clang;
26
27
28static DiagnosticBuilder Diag(Diagnostic &D, SourceLocation Loc,
29                              unsigned DiagID) {
30  return D.Report(Loc, DiagID);
31}
32
33
34void UnqualifiedId::setTemplateId(TemplateIdAnnotation *TemplateId) {
35  assert(TemplateId && "NULL template-id annotation?");
36  Kind = IK_TemplateId;
37  this->TemplateId = TemplateId;
38  StartLocation = TemplateId->TemplateNameLoc;
39  EndLocation = TemplateId->RAngleLoc;
40}
41
42void UnqualifiedId::setConstructorTemplateId(TemplateIdAnnotation *TemplateId) {
43  assert(TemplateId && "NULL template-id annotation?");
44  Kind = IK_ConstructorTemplateId;
45  this->TemplateId = TemplateId;
46  StartLocation = TemplateId->TemplateNameLoc;
47  EndLocation = TemplateId->RAngleLoc;
48}
49
50void CXXScopeSpec::Extend(ASTContext &Context, SourceLocation TemplateKWLoc,
51                          TypeLoc TL, SourceLocation ColonColonLoc) {
52  Builder.Extend(Context, TemplateKWLoc, TL, ColonColonLoc);
53  if (Range.getBegin().isInvalid())
54    Range.setBegin(TL.getBeginLoc());
55  Range.setEnd(ColonColonLoc);
56
57  assert(Range == Builder.getSourceRange() &&
58         "NestedNameSpecifierLoc range computation incorrect");
59}
60
61void CXXScopeSpec::Extend(ASTContext &Context, IdentifierInfo *Identifier,
62                          SourceLocation IdentifierLoc,
63                          SourceLocation ColonColonLoc) {
64  Builder.Extend(Context, Identifier, IdentifierLoc, ColonColonLoc);
65
66  if (Range.getBegin().isInvalid())
67    Range.setBegin(IdentifierLoc);
68  Range.setEnd(ColonColonLoc);
69
70  assert(Range == Builder.getSourceRange() &&
71         "NestedNameSpecifierLoc range computation incorrect");
72}
73
74void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
75                          SourceLocation NamespaceLoc,
76                          SourceLocation ColonColonLoc) {
77  Builder.Extend(Context, Namespace, NamespaceLoc, ColonColonLoc);
78
79  if (Range.getBegin().isInvalid())
80    Range.setBegin(NamespaceLoc);
81  Range.setEnd(ColonColonLoc);
82
83  assert(Range == Builder.getSourceRange() &&
84         "NestedNameSpecifierLoc range computation incorrect");
85}
86
87void CXXScopeSpec::Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
88                          SourceLocation AliasLoc,
89                          SourceLocation ColonColonLoc) {
90  Builder.Extend(Context, Alias, AliasLoc, ColonColonLoc);
91
92  if (Range.getBegin().isInvalid())
93    Range.setBegin(AliasLoc);
94  Range.setEnd(ColonColonLoc);
95
96  assert(Range == Builder.getSourceRange() &&
97         "NestedNameSpecifierLoc range computation incorrect");
98}
99
100void CXXScopeSpec::MakeGlobal(ASTContext &Context,
101                              SourceLocation ColonColonLoc) {
102  Builder.MakeGlobal(Context, ColonColonLoc);
103
104  Range = SourceRange(ColonColonLoc);
105
106  assert(Range == Builder.getSourceRange() &&
107         "NestedNameSpecifierLoc range computation incorrect");
108}
109
110void CXXScopeSpec::MakeTrivial(ASTContext &Context,
111                               NestedNameSpecifier *Qualifier, SourceRange R) {
112  Builder.MakeTrivial(Context, Qualifier, R);
113  Range = R;
114}
115
116void CXXScopeSpec::Adopt(NestedNameSpecifierLoc Other) {
117  if (!Other) {
118    Range = SourceRange();
119    Builder.Clear();
120    return;
121  }
122
123  Range = Other.getSourceRange();
124  Builder.Adopt(Other);
125}
126
127NestedNameSpecifierLoc
128CXXScopeSpec::getWithLocInContext(ASTContext &Context) const {
129  if (!Builder.getRepresentation())
130    return NestedNameSpecifierLoc();
131
132  return Builder.getWithLocInContext(Context);
133}
134
135/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
136/// "TheDeclarator" is the declarator that this will be added to.
137DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto, bool isVariadic,
138                                             SourceLocation EllipsisLoc,
139                                             ParamInfo *ArgInfo,
140                                             unsigned NumArgs,
141                                             unsigned TypeQuals,
142                                             bool RefQualifierIsLvalueRef,
143                                             SourceLocation RefQualifierLoc,
144                                             ExceptionSpecificationType
145                                                 ESpecType,
146                                             SourceLocation ESpecLoc,
147                                             ParsedType *Exceptions,
148                                             SourceRange *ExceptionRanges,
149                                             unsigned NumExceptions,
150                                             Expr *NoexceptExpr,
151                                             SourceLocation LocalRangeBegin,
152                                             SourceLocation LocalRangeEnd,
153                                             Declarator &TheDeclarator,
154                                             ParsedType TrailingReturnType) {
155  DeclaratorChunk I;
156  I.Kind                        = Function;
157  I.Loc                         = LocalRangeBegin;
158  I.EndLoc                      = LocalRangeEnd;
159  I.Fun.AttrList                = 0;
160  I.Fun.hasPrototype            = hasProto;
161  I.Fun.isVariadic              = isVariadic;
162  I.Fun.EllipsisLoc             = EllipsisLoc.getRawEncoding();
163  I.Fun.DeleteArgInfo           = false;
164  I.Fun.TypeQuals               = TypeQuals;
165  I.Fun.NumArgs                 = NumArgs;
166  I.Fun.ArgInfo                 = 0;
167  I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
168  I.Fun.RefQualifierLoc         = RefQualifierLoc.getRawEncoding();
169  I.Fun.ExceptionSpecType       = ESpecType;
170  I.Fun.ExceptionSpecLoc        = ESpecLoc.getRawEncoding();
171  I.Fun.NumExceptions           = 0;
172  I.Fun.Exceptions              = 0;
173  I.Fun.NoexceptExpr            = 0;
174  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
175
176  // new[] an argument array if needed.
177  if (NumArgs) {
178    // If the 'InlineParams' in Declarator is unused and big enough, put our
179    // parameter list there (in an effort to avoid new/delete traffic).  If it
180    // is already used (consider a function returning a function pointer) or too
181    // small (function taking too many arguments), go to the heap.
182    if (!TheDeclarator.InlineParamsUsed &&
183        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
184      I.Fun.ArgInfo = TheDeclarator.InlineParams;
185      I.Fun.DeleteArgInfo = false;
186      TheDeclarator.InlineParamsUsed = true;
187    } else {
188      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
189      I.Fun.DeleteArgInfo = true;
190    }
191    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
192  }
193
194  // Check what exception specification information we should actually store.
195  switch (ESpecType) {
196  default: break; // By default, save nothing.
197  case EST_Dynamic:
198    // new[] an exception array if needed
199    if (NumExceptions) {
200      I.Fun.NumExceptions = NumExceptions;
201      I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
202      for (unsigned i = 0; i != NumExceptions; ++i) {
203        I.Fun.Exceptions[i].Ty = Exceptions[i];
204        I.Fun.Exceptions[i].Range = ExceptionRanges[i];
205      }
206    }
207    break;
208
209  case EST_ComputedNoexcept:
210    I.Fun.NoexceptExpr = NoexceptExpr;
211    break;
212  }
213  return I;
214}
215
216/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
217/// declaration specifier includes.
218///
219unsigned DeclSpec::getParsedSpecifiers() const {
220  unsigned Res = 0;
221  if (StorageClassSpec != SCS_unspecified ||
222      SCS_thread_specified)
223    Res |= PQ_StorageClassSpecifier;
224
225  if (TypeQualifiers != TQ_unspecified)
226    Res |= PQ_TypeQualifier;
227
228  if (hasTypeSpecifier())
229    Res |= PQ_TypeSpecifier;
230
231  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
232    Res |= PQ_FunctionSpecifier;
233  return Res;
234}
235
236template <class T> static bool BadSpecifier(T TNew, T TPrev,
237                                            const char *&PrevSpec,
238                                            unsigned &DiagID) {
239  PrevSpec = DeclSpec::getSpecifierName(TPrev);
240  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
241            : diag::err_invalid_decl_spec_combination);
242  return true;
243}
244
245const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
246  switch (S) {
247  case DeclSpec::SCS_unspecified: return "unspecified";
248  case DeclSpec::SCS_typedef:     return "typedef";
249  case DeclSpec::SCS_extern:      return "extern";
250  case DeclSpec::SCS_static:      return "static";
251  case DeclSpec::SCS_auto:        return "auto";
252  case DeclSpec::SCS_register:    return "register";
253  case DeclSpec::SCS_private_extern: return "__private_extern__";
254  case DeclSpec::SCS_mutable:     return "mutable";
255  }
256  llvm_unreachable("Unknown typespec!");
257}
258
259const char *DeclSpec::getSpecifierName(TSW W) {
260  switch (W) {
261  case TSW_unspecified: return "unspecified";
262  case TSW_short:       return "short";
263  case TSW_long:        return "long";
264  case TSW_longlong:    return "long long";
265  }
266  llvm_unreachable("Unknown typespec!");
267}
268
269const char *DeclSpec::getSpecifierName(TSC C) {
270  switch (C) {
271  case TSC_unspecified: return "unspecified";
272  case TSC_imaginary:   return "imaginary";
273  case TSC_complex:     return "complex";
274  }
275  llvm_unreachable("Unknown typespec!");
276}
277
278
279const char *DeclSpec::getSpecifierName(TSS S) {
280  switch (S) {
281  case TSS_unspecified: return "unspecified";
282  case TSS_signed:      return "signed";
283  case TSS_unsigned:    return "unsigned";
284  }
285  llvm_unreachable("Unknown typespec!");
286}
287
288const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
289  switch (T) {
290  case DeclSpec::TST_unspecified: return "unspecified";
291  case DeclSpec::TST_void:        return "void";
292  case DeclSpec::TST_char:        return "char";
293  case DeclSpec::TST_wchar:       return "wchar_t";
294  case DeclSpec::TST_char16:      return "char16_t";
295  case DeclSpec::TST_char32:      return "char32_t";
296  case DeclSpec::TST_int:         return "int";
297  case DeclSpec::TST_float:       return "float";
298  case DeclSpec::TST_double:      return "double";
299  case DeclSpec::TST_bool:        return "_Bool";
300  case DeclSpec::TST_decimal32:   return "_Decimal32";
301  case DeclSpec::TST_decimal64:   return "_Decimal64";
302  case DeclSpec::TST_decimal128:  return "_Decimal128";
303  case DeclSpec::TST_enum:        return "enum";
304  case DeclSpec::TST_class:       return "class";
305  case DeclSpec::TST_union:       return "union";
306  case DeclSpec::TST_struct:      return "struct";
307  case DeclSpec::TST_typename:    return "type-name";
308  case DeclSpec::TST_typeofType:
309  case DeclSpec::TST_typeofExpr:  return "typeof";
310  case DeclSpec::TST_auto:        return "auto";
311  case DeclSpec::TST_decltype:    return "(decltype)";
312  case DeclSpec::TST_underlyingType: return "__underlying_type";
313  case DeclSpec::TST_unknown_anytype: return "__unknown_anytype";
314  case DeclSpec::TST_error:       return "(error)";
315  }
316  llvm_unreachable("Unknown typespec!");
317}
318
319const char *DeclSpec::getSpecifierName(TQ T) {
320  switch (T) {
321  case DeclSpec::TQ_unspecified: return "unspecified";
322  case DeclSpec::TQ_const:       return "const";
323  case DeclSpec::TQ_restrict:    return "restrict";
324  case DeclSpec::TQ_volatile:    return "volatile";
325  }
326  llvm_unreachable("Unknown typespec!");
327}
328
329bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
330                                   const char *&PrevSpec,
331                                   unsigned &DiagID,
332                                   const LangOptions &Lang) {
333  // OpenCL prohibits extern, auto, register, and static
334  // It seems sensible to prohibit private_extern too
335  if (Lang.OpenCL) {
336    switch (S) {
337    case SCS_extern:
338    case SCS_private_extern:
339    case SCS_auto:
340    case SCS_register:
341    case SCS_static:
342      DiagID   = diag::err_not_opencl_storage_class_specifier;
343      PrevSpec = getSpecifierName(S);
344      return true;
345    default:
346      break;
347    }
348  }
349
350  if (StorageClassSpec != SCS_unspecified) {
351    // Changing storage class is allowed only if the previous one
352    // was the 'extern' that is part of a linkage specification and
353    // the new storage class is 'typedef'.
354    if (!(SCS_extern_in_linkage_spec &&
355          StorageClassSpec == SCS_extern &&
356          S == SCS_typedef))
357      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
358  }
359  StorageClassSpec = S;
360  StorageClassSpecLoc = Loc;
361  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
362  return false;
363}
364
365bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
366                                         const char *&PrevSpec,
367                                         unsigned &DiagID) {
368  if (SCS_thread_specified) {
369    PrevSpec = "__thread";
370    DiagID = diag::ext_duplicate_declspec;
371    return true;
372  }
373  SCS_thread_specified = true;
374  SCS_threadLoc = Loc;
375  return false;
376}
377
378/// These methods set the specified attribute of the DeclSpec, but return true
379/// and ignore the request if invalid (e.g. "extern" then "auto" is
380/// specified).
381bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
382                                const char *&PrevSpec,
383                                unsigned &DiagID) {
384  // Overwrite TSWLoc only if TypeSpecWidth was unspecified, so that
385  // for 'long long' we will keep the source location of the first 'long'.
386  if (TypeSpecWidth == TSW_unspecified)
387    TSWLoc = Loc;
388  // Allow turning long -> long long.
389  else if (W != TSW_longlong || TypeSpecWidth != TSW_long)
390    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
391  TypeSpecWidth = W;
392  if (TypeAltiVecVector && !TypeAltiVecBool &&
393      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
394    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
395    DiagID = diag::warn_vector_long_decl_spec_combination;
396    return true;
397  }
398  return false;
399}
400
401bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
402                                  const char *&PrevSpec,
403                                  unsigned &DiagID) {
404  if (TypeSpecComplex != TSC_unspecified)
405    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
406  TypeSpecComplex = C;
407  TSCLoc = Loc;
408  return false;
409}
410
411bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
412                               const char *&PrevSpec,
413                               unsigned &DiagID) {
414  if (TypeSpecSign != TSS_unspecified)
415    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
416  TypeSpecSign = S;
417  TSSLoc = Loc;
418  return false;
419}
420
421bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
422                               const char *&PrevSpec,
423                               unsigned &DiagID,
424                               ParsedType Rep) {
425  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep);
426}
427
428bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
429                               SourceLocation TagNameLoc,
430                               const char *&PrevSpec,
431                               unsigned &DiagID,
432                               ParsedType Rep) {
433  assert(isTypeRep(T) && "T does not store a type");
434  assert(Rep && "no type provided!");
435  if (TypeSpecType != TST_unspecified) {
436    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
437    DiagID = diag::err_invalid_decl_spec_combination;
438    return true;
439  }
440  TypeSpecType = T;
441  TypeRep = Rep;
442  TSTLoc = TagKwLoc;
443  TSTNameLoc = TagNameLoc;
444  TypeSpecOwned = false;
445  return false;
446}
447
448bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
449                               const char *&PrevSpec,
450                               unsigned &DiagID,
451                               Expr *Rep) {
452  assert(isExprRep(T) && "T does not store an expr");
453  assert(Rep && "no expression provided!");
454  if (TypeSpecType != TST_unspecified) {
455    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
456    DiagID = diag::err_invalid_decl_spec_combination;
457    return true;
458  }
459  TypeSpecType = T;
460  ExprRep = Rep;
461  TSTLoc = Loc;
462  TSTNameLoc = Loc;
463  TypeSpecOwned = false;
464  return false;
465}
466
467bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
468                               const char *&PrevSpec,
469                               unsigned &DiagID,
470                               Decl *Rep, bool Owned) {
471  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep, Owned);
472}
473
474bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
475                               SourceLocation TagNameLoc,
476                               const char *&PrevSpec,
477                               unsigned &DiagID,
478                               Decl *Rep, bool Owned) {
479  assert(isDeclRep(T) && "T does not store a decl");
480  // Unlike the other cases, we don't assert that we actually get a decl.
481
482  if (TypeSpecType != TST_unspecified) {
483    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
484    DiagID = diag::err_invalid_decl_spec_combination;
485    return true;
486  }
487  TypeSpecType = T;
488  DeclRep = Rep;
489  TSTLoc = TagKwLoc;
490  TSTNameLoc = TagNameLoc;
491  TypeSpecOwned = Owned;
492  return false;
493}
494
495bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
496                               const char *&PrevSpec,
497                               unsigned &DiagID) {
498  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
499         "rep required for these type-spec kinds!");
500  if (TypeSpecType != TST_unspecified) {
501    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
502    DiagID = diag::err_invalid_decl_spec_combination;
503    return true;
504  }
505  TSTLoc = Loc;
506  TSTNameLoc = Loc;
507  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
508    TypeAltiVecBool = true;
509    return false;
510  }
511  TypeSpecType = T;
512  TypeSpecOwned = false;
513  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
514    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
515    DiagID = diag::err_invalid_vector_decl_spec;
516    return true;
517  }
518  return false;
519}
520
521bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
522                          const char *&PrevSpec, unsigned &DiagID) {
523  if (TypeSpecType != TST_unspecified) {
524    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
525    DiagID = diag::err_invalid_vector_decl_spec_combination;
526    return true;
527  }
528  TypeAltiVecVector = isAltiVecVector;
529  AltiVecLoc = Loc;
530  return false;
531}
532
533bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
534                          const char *&PrevSpec, unsigned &DiagID) {
535  if (!TypeAltiVecVector || TypeAltiVecPixel ||
536      (TypeSpecType != TST_unspecified)) {
537    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
538    DiagID = diag::err_invalid_pixel_decl_spec_combination;
539    return true;
540  }
541  TypeAltiVecPixel = isAltiVecPixel;
542  TSTLoc = Loc;
543  TSTNameLoc = Loc;
544  return false;
545}
546
547bool DeclSpec::SetTypeSpecError() {
548  TypeSpecType = TST_error;
549  TypeSpecOwned = false;
550  TSTLoc = SourceLocation();
551  TSTNameLoc = SourceLocation();
552  return false;
553}
554
555bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
556                           unsigned &DiagID, const LangOptions &Lang) {
557  // Duplicates turn into warnings pre-C99.
558  if ((TypeQualifiers & T) && !Lang.C99)
559    return BadSpecifier(T, T, PrevSpec, DiagID);
560  TypeQualifiers |= T;
561
562  switch (T) {
563  default: assert(0 && "Unknown type qualifier!");
564  case TQ_const:    TQ_constLoc = Loc; break;
565  case TQ_restrict: TQ_restrictLoc = Loc; break;
566  case TQ_volatile: TQ_volatileLoc = Loc; break;
567  }
568  return false;
569}
570
571bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
572                                     unsigned &DiagID) {
573  // 'inline inline' is ok.
574  FS_inline_specified = true;
575  FS_inlineLoc = Loc;
576  return false;
577}
578
579bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
580                                      unsigned &DiagID) {
581  // 'virtual virtual' is ok.
582  FS_virtual_specified = true;
583  FS_virtualLoc = Loc;
584  return false;
585}
586
587bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
588                                       unsigned &DiagID) {
589  // 'explicit explicit' is ok.
590  FS_explicit_specified = true;
591  FS_explicitLoc = Loc;
592  return false;
593}
594
595bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
596                             unsigned &DiagID) {
597  if (Friend_specified) {
598    PrevSpec = "friend";
599    DiagID = diag::ext_duplicate_declspec;
600    return true;
601  }
602
603  Friend_specified = true;
604  FriendLoc = Loc;
605  return false;
606}
607
608bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
609                                unsigned &DiagID) {
610  // 'constexpr constexpr' is ok.
611  Constexpr_specified = true;
612  ConstexprLoc = Loc;
613  return false;
614}
615
616void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
617                                     unsigned NP,
618                                     SourceLocation *ProtoLocs,
619                                     SourceLocation LAngleLoc) {
620  if (NP == 0) return;
621  ProtocolQualifiers = new Decl*[NP];
622  ProtocolLocs = new SourceLocation[NP];
623  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
624  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
625  NumProtocolQualifiers = NP;
626  ProtocolLAngleLoc = LAngleLoc;
627}
628
629void DeclSpec::SaveWrittenBuiltinSpecs() {
630  writtenBS.Sign = getTypeSpecSign();
631  writtenBS.Width = getTypeSpecWidth();
632  writtenBS.Type = getTypeSpecType();
633  // Search the list of attributes for the presence of a mode attribute.
634  writtenBS.ModeAttr = false;
635  AttributeList* attrs = getAttributes().getList();
636  while (attrs) {
637    if (attrs->getKind() == AttributeList::AT_mode) {
638      writtenBS.ModeAttr = true;
639      break;
640    }
641    attrs = attrs->getNext();
642  }
643}
644
645void DeclSpec::SaveStorageSpecifierAsWritten() {
646  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
647    // If 'extern' is part of a linkage specification,
648    // then it is not a storage class "as written".
649    StorageClassSpecAsWritten = SCS_unspecified;
650  else
651    StorageClassSpecAsWritten = StorageClassSpec;
652}
653
654/// Finish - This does final analysis of the declspec, rejecting things like
655/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
656/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
657/// DeclSpec is guaranteed self-consistent, even if an error occurred.
658void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
659  // Before possibly changing their values, save specs as written.
660  SaveWrittenBuiltinSpecs();
661  SaveStorageSpecifierAsWritten();
662
663  // Check the type specifier components first.
664
665  // Validate and finalize AltiVec vector declspec.
666  if (TypeAltiVecVector) {
667    if (TypeAltiVecBool) {
668      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
669      if (TypeSpecSign != TSS_unspecified) {
670        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
671          << getSpecifierName((TSS)TypeSpecSign);
672      }
673
674      // Only char/int are valid with vector bool. (PIM 2.1)
675      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
676           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
677        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
678          << (TypeAltiVecPixel ? "__pixel" :
679                                 getSpecifierName((TST)TypeSpecType));
680      }
681
682      // Only 'short' is valid with vector bool. (PIM 2.1)
683      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
684        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
685          << getSpecifierName((TSW)TypeSpecWidth);
686
687      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
688      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
689          (TypeSpecWidth != TSW_unspecified))
690        TypeSpecSign = TSS_unsigned;
691    }
692
693    if (TypeAltiVecPixel) {
694      //TODO: perform validation
695      TypeSpecType = TST_int;
696      TypeSpecSign = TSS_unsigned;
697      TypeSpecWidth = TSW_short;
698      TypeSpecOwned = false;
699    }
700  }
701
702  // signed/unsigned are only valid with int/char/wchar_t.
703  if (TypeSpecSign != TSS_unspecified) {
704    if (TypeSpecType == TST_unspecified)
705      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
706    else if (TypeSpecType != TST_int  &&
707             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
708      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
709        << getSpecifierName((TST)TypeSpecType);
710      // signed double -> double.
711      TypeSpecSign = TSS_unspecified;
712    }
713  }
714
715  // Validate the width of the type.
716  switch (TypeSpecWidth) {
717  case TSW_unspecified: break;
718  case TSW_short:    // short int
719  case TSW_longlong: // long long int
720    if (TypeSpecType == TST_unspecified)
721      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
722    else if (TypeSpecType != TST_int) {
723      Diag(D, TSWLoc,
724           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
725                                      : diag::err_invalid_longlong_spec)
726        <<  getSpecifierName((TST)TypeSpecType);
727      TypeSpecType = TST_int;
728      TypeSpecOwned = false;
729    }
730    break;
731  case TSW_long:  // long double, long int
732    if (TypeSpecType == TST_unspecified)
733      TypeSpecType = TST_int;  // long -> long int.
734    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
735      Diag(D, TSWLoc, diag::err_invalid_long_spec)
736        << getSpecifierName((TST)TypeSpecType);
737      TypeSpecType = TST_int;
738      TypeSpecOwned = false;
739    }
740    break;
741  }
742
743  // TODO: if the implementation does not implement _Complex or _Imaginary,
744  // disallow their use.  Need information about the backend.
745  if (TypeSpecComplex != TSC_unspecified) {
746    if (TypeSpecType == TST_unspecified) {
747      Diag(D, TSCLoc, diag::ext_plain_complex)
748        << FixItHint::CreateInsertion(
749                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
750                                                 " double");
751      TypeSpecType = TST_double;   // _Complex -> _Complex double.
752    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
753      // Note that this intentionally doesn't include _Complex _Bool.
754      Diag(D, TSTLoc, diag::ext_integer_complex);
755    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
756      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
757        << getSpecifierName((TST)TypeSpecType);
758      TypeSpecComplex = TSC_unspecified;
759    }
760  }
761
762  // C++ [class.friend]p6:
763  //   No storage-class-specifier shall appear in the decl-specifier-seq
764  //   of a friend declaration.
765  if (isFriendSpecified() && getStorageClassSpec()) {
766    DeclSpec::SCS SC = getStorageClassSpec();
767    const char *SpecName = getSpecifierName(SC);
768
769    SourceLocation SCLoc = getStorageClassSpecLoc();
770    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
771
772    Diag(D, SCLoc, diag::err_friend_storage_spec)
773      << SpecName
774      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
775
776    ClearStorageClassSpecs();
777  }
778
779  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
780
781  // Okay, now we can infer the real type.
782
783  // TODO: return "auto function" and other bad things based on the real type.
784
785  // 'data definition has no type or storage class'?
786}
787
788bool DeclSpec::isMissingDeclaratorOk() {
789  TST tst = getTypeSpecType();
790  return isDeclRep(tst) && getRepAsDecl() != 0 &&
791    StorageClassSpec != DeclSpec::SCS_typedef;
792}
793
794void UnqualifiedId::clear() {
795  if (Kind == IK_TemplateId)
796    TemplateId->Destroy();
797
798  Kind = IK_Identifier;
799  Identifier = 0;
800  StartLocation = SourceLocation();
801  EndLocation = SourceLocation();
802}
803
804void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
805                                          OverloadedOperatorKind Op,
806                                          SourceLocation SymbolLocations[3]) {
807  Kind = IK_OperatorFunctionId;
808  StartLocation = OperatorLoc;
809  EndLocation = OperatorLoc;
810  OperatorFunctionId.Operator = Op;
811  for (unsigned I = 0; I != 3; ++I) {
812    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
813
814    if (SymbolLocations[I].isValid())
815      EndLocation = SymbolLocations[I];
816  }
817}
818
819bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
820                                  const char *&PrevSpec) {
821  LastLocation = Loc;
822
823  if (Specifiers & VS) {
824    PrevSpec = getSpecifierName(VS);
825    return true;
826  }
827
828  Specifiers |= VS;
829
830  switch (VS) {
831  default: assert(0 && "Unknown specifier!");
832  case VS_Override: VS_overrideLoc = Loc; break;
833  case VS_Final:    VS_finalLoc = Loc; break;
834  }
835
836  return false;
837}
838
839const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
840  switch (VS) {
841  default: assert(0 && "Unknown specifier");
842  case VS_Override: return "override";
843  case VS_Final: return "final";
844  }
845}
846