DeclSpec.cpp revision f52516038ab5d0b1b90a6dd32f46b7d6dabd04c8 
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(const ParsedAttributes &attrs,
138                                             bool hasProto, bool isVariadic,
139                                             SourceLocation EllipsisLoc,
140                                             ParamInfo *ArgInfo,
141                                             unsigned NumArgs,
142                                             unsigned TypeQuals,
143                                             bool RefQualifierIsLvalueRef,
144                                             SourceLocation RefQualifierLoc,
145                                             ExceptionSpecificationType
146                                                 ESpecType,
147                                             SourceLocation ESpecLoc,
148                                             ParsedType *Exceptions,
149                                             SourceRange *ExceptionRanges,
150                                             unsigned NumExceptions,
151                                             Expr *NoexceptExpr,
152                                             SourceLocation LPLoc,
153                                             SourceLocation RPLoc,
154                                             Declarator &TheDeclarator,
155                                             ParsedType TrailingReturnType) {
156  DeclaratorChunk I;
157  I.Kind                        = Function;
158  I.Loc                         = LPLoc;
159  I.EndLoc                      = RPLoc;
160  I.Fun.AttrList                = attrs.getList();
161  I.Fun.hasPrototype            = hasProto;
162  I.Fun.isVariadic              = isVariadic;
163  I.Fun.EllipsisLoc             = EllipsisLoc.getRawEncoding();
164  I.Fun.DeleteArgInfo           = false;
165  I.Fun.TypeQuals               = TypeQuals;
166  I.Fun.NumArgs                 = NumArgs;
167  I.Fun.ArgInfo                 = 0;
168  I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
169  I.Fun.RefQualifierLoc         = RefQualifierLoc.getRawEncoding();
170  I.Fun.ExceptionSpecType       = ESpecType;
171  I.Fun.ExceptionSpecLoc        = ESpecLoc.getRawEncoding();
172  I.Fun.NumExceptions           = 0;
173  I.Fun.Exceptions              = 0;
174  I.Fun.NoexceptExpr            = 0;
175  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
176
177  // new[] an argument array if needed.
178  if (NumArgs) {
179    // If the 'InlineParams' in Declarator is unused and big enough, put our
180    // parameter list there (in an effort to avoid new/delete traffic).  If it
181    // is already used (consider a function returning a function pointer) or too
182    // small (function taking too many arguments), go to the heap.
183    if (!TheDeclarator.InlineParamsUsed &&
184        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
185      I.Fun.ArgInfo = TheDeclarator.InlineParams;
186      I.Fun.DeleteArgInfo = false;
187      TheDeclarator.InlineParamsUsed = true;
188    } else {
189      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
190      I.Fun.DeleteArgInfo = true;
191    }
192    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
193  }
194
195  // Check what exception specification information we should actually store.
196  switch (ESpecType) {
197  default: break; // By default, save nothing.
198  case EST_Dynamic:
199    // new[] an exception array if needed
200    if (NumExceptions) {
201      I.Fun.NumExceptions = NumExceptions;
202      I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
203      for (unsigned i = 0; i != NumExceptions; ++i) {
204        I.Fun.Exceptions[i].Ty = Exceptions[i];
205        I.Fun.Exceptions[i].Range = ExceptionRanges[i];
206      }
207    }
208    break;
209
210  case EST_ComputedNoexcept:
211    I.Fun.NoexceptExpr = NoexceptExpr;
212    break;
213  }
214  return I;
215}
216
217/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
218/// declaration specifier includes.
219///
220unsigned DeclSpec::getParsedSpecifiers() const {
221  unsigned Res = 0;
222  if (StorageClassSpec != SCS_unspecified ||
223      SCS_thread_specified)
224    Res |= PQ_StorageClassSpecifier;
225
226  if (TypeQualifiers != TQ_unspecified)
227    Res |= PQ_TypeQualifier;
228
229  if (hasTypeSpecifier())
230    Res |= PQ_TypeSpecifier;
231
232  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
233    Res |= PQ_FunctionSpecifier;
234  return Res;
235}
236
237template <class T> static bool BadSpecifier(T TNew, T TPrev,
238                                            const char *&PrevSpec,
239                                            unsigned &DiagID) {
240  PrevSpec = DeclSpec::getSpecifierName(TPrev);
241  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
242            : diag::err_invalid_decl_spec_combination);
243  return true;
244}
245
246const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
247  switch (S) {
248  case DeclSpec::SCS_unspecified: return "unspecified";
249  case DeclSpec::SCS_typedef:     return "typedef";
250  case DeclSpec::SCS_extern:      return "extern";
251  case DeclSpec::SCS_static:      return "static";
252  case DeclSpec::SCS_auto:        return "auto";
253  case DeclSpec::SCS_register:    return "register";
254  case DeclSpec::SCS_private_extern: return "__private_extern__";
255  case DeclSpec::SCS_mutable:     return "mutable";
256  }
257  llvm_unreachable("Unknown typespec!");
258}
259
260const char *DeclSpec::getSpecifierName(TSW W) {
261  switch (W) {
262  case TSW_unspecified: return "unspecified";
263  case TSW_short:       return "short";
264  case TSW_long:        return "long";
265  case TSW_longlong:    return "long long";
266  }
267  llvm_unreachable("Unknown typespec!");
268}
269
270const char *DeclSpec::getSpecifierName(TSC C) {
271  switch (C) {
272  case TSC_unspecified: return "unspecified";
273  case TSC_imaginary:   return "imaginary";
274  case TSC_complex:     return "complex";
275  }
276  llvm_unreachable("Unknown typespec!");
277}
278
279
280const char *DeclSpec::getSpecifierName(TSS S) {
281  switch (S) {
282  case TSS_unspecified: return "unspecified";
283  case TSS_signed:      return "signed";
284  case TSS_unsigned:    return "unsigned";
285  }
286  llvm_unreachable("Unknown typespec!");
287}
288
289const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
290  switch (T) {
291  case DeclSpec::TST_unspecified: return "unspecified";
292  case DeclSpec::TST_void:        return "void";
293  case DeclSpec::TST_char:        return "char";
294  case DeclSpec::TST_wchar:       return "wchar_t";
295  case DeclSpec::TST_char16:      return "char16_t";
296  case DeclSpec::TST_char32:      return "char32_t";
297  case DeclSpec::TST_int:         return "int";
298  case DeclSpec::TST_float:       return "float";
299  case DeclSpec::TST_double:      return "double";
300  case DeclSpec::TST_bool:        return "_Bool";
301  case DeclSpec::TST_decimal32:   return "_Decimal32";
302  case DeclSpec::TST_decimal64:   return "_Decimal64";
303  case DeclSpec::TST_decimal128:  return "_Decimal128";
304  case DeclSpec::TST_enum:        return "enum";
305  case DeclSpec::TST_class:       return "class";
306  case DeclSpec::TST_union:       return "union";
307  case DeclSpec::TST_struct:      return "struct";
308  case DeclSpec::TST_typename:    return "type-name";
309  case DeclSpec::TST_typeofType:
310  case DeclSpec::TST_typeofExpr:  return "typeof";
311  case DeclSpec::TST_auto:        return "auto";
312  case DeclSpec::TST_decltype:    return "(decltype)";
313  case DeclSpec::TST_error:       return "(error)";
314  }
315  llvm_unreachable("Unknown typespec!");
316}
317
318const char *DeclSpec::getSpecifierName(TQ T) {
319  switch (T) {
320  case DeclSpec::TQ_unspecified: return "unspecified";
321  case DeclSpec::TQ_const:       return "const";
322  case DeclSpec::TQ_restrict:    return "restrict";
323  case DeclSpec::TQ_volatile:    return "volatile";
324  }
325  llvm_unreachable("Unknown typespec!");
326}
327
328bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
329                                   const char *&PrevSpec,
330                                   unsigned &DiagID,
331                                   const LangOptions &Lang) {
332  // OpenCL prohibits extern, auto, register, and static
333  // It seems sensible to prohibit private_extern too
334  if (Lang.OpenCL) {
335    switch (S) {
336    case SCS_extern:
337    case SCS_private_extern:
338    case SCS_auto:
339    case SCS_register:
340    case SCS_static:
341      DiagID   = diag::err_not_opencl_storage_class_specifier;
342      PrevSpec = getSpecifierName(S);
343      return true;
344    default:
345      break;
346    }
347  }
348
349  if (StorageClassSpec != SCS_unspecified) {
350    // Changing storage class is allowed only if the previous one
351    // was the 'extern' that is part of a linkage specification and
352    // the new storage class is 'typedef'.
353    if (!(SCS_extern_in_linkage_spec &&
354          StorageClassSpec == SCS_extern &&
355          S == SCS_typedef))
356      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
357  }
358  StorageClassSpec = S;
359  StorageClassSpecLoc = Loc;
360  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
361  return false;
362}
363
364bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
365                                         const char *&PrevSpec,
366                                         unsigned &DiagID) {
367  if (SCS_thread_specified) {
368    PrevSpec = "__thread";
369    DiagID = diag::ext_duplicate_declspec;
370    return true;
371  }
372  SCS_thread_specified = true;
373  SCS_threadLoc = Loc;
374  return false;
375}
376
377/// These methods set the specified attribute of the DeclSpec, but return true
378/// and ignore the request if invalid (e.g. "extern" then "auto" is
379/// specified).
380bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
381                                const char *&PrevSpec,
382                                unsigned &DiagID) {
383  // Overwrite TSWLoc only if TypeSpecWidth was unspecified, so that
384  // for 'long long' we will keep the source location of the first 'long'.
385  if (TypeSpecWidth == TSW_unspecified)
386    TSWLoc = Loc;
387  // Allow turning long -> long long.
388  else if (W != TSW_longlong || TypeSpecWidth != TSW_long)
389    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
390  TypeSpecWidth = W;
391  if (TypeAltiVecVector && !TypeAltiVecBool &&
392      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
393    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
394    DiagID = diag::warn_vector_long_decl_spec_combination;
395    return true;
396  }
397  return false;
398}
399
400bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
401                                  const char *&PrevSpec,
402                                  unsigned &DiagID) {
403  if (TypeSpecComplex != TSC_unspecified)
404    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
405  TypeSpecComplex = C;
406  TSCLoc = Loc;
407  return false;
408}
409
410bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
411                               const char *&PrevSpec,
412                               unsigned &DiagID) {
413  if (TypeSpecSign != TSS_unspecified)
414    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
415  TypeSpecSign = S;
416  TSSLoc = Loc;
417  return false;
418}
419
420bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
421                               const char *&PrevSpec,
422                               unsigned &DiagID,
423                               ParsedType Rep) {
424  assert(isTypeRep(T) && "T does not store a type");
425  assert(Rep && "no type provided!");
426  if (TypeSpecType != TST_unspecified) {
427    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
428    DiagID = diag::err_invalid_decl_spec_combination;
429    return true;
430  }
431  TypeSpecType = T;
432  TypeRep = Rep;
433  TSTLoc = Loc;
434  TypeSpecOwned = false;
435  return false;
436}
437
438bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
439                               const char *&PrevSpec,
440                               unsigned &DiagID,
441                               Expr *Rep) {
442  assert(isExprRep(T) && "T does not store an expr");
443  assert(Rep && "no expression provided!");
444  if (TypeSpecType != TST_unspecified) {
445    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
446    DiagID = diag::err_invalid_decl_spec_combination;
447    return true;
448  }
449  TypeSpecType = T;
450  ExprRep = Rep;
451  TSTLoc = Loc;
452  TypeSpecOwned = false;
453  return false;
454}
455
456bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
457                               const char *&PrevSpec,
458                               unsigned &DiagID,
459                               Decl *Rep, bool Owned) {
460  assert(isDeclRep(T) && "T does not store a decl");
461  // Unlike the other cases, we don't assert that we actually get a decl.
462
463  if (TypeSpecType != TST_unspecified) {
464    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
465    DiagID = diag::err_invalid_decl_spec_combination;
466    return true;
467  }
468  TypeSpecType = T;
469  DeclRep = Rep;
470  TSTLoc = Loc;
471  TypeSpecOwned = Owned;
472  return false;
473}
474
475bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
476                               const char *&PrevSpec,
477                               unsigned &DiagID) {
478  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
479         "rep required for these type-spec kinds!");
480  if (TypeSpecType != TST_unspecified) {
481    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
482    DiagID = diag::err_invalid_decl_spec_combination;
483    return true;
484  }
485  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
486    TypeAltiVecBool = true;
487    TSTLoc = Loc;
488    return false;
489  }
490  TypeSpecType = T;
491  TSTLoc = Loc;
492  TypeSpecOwned = false;
493  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
494    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
495    DiagID = diag::err_invalid_vector_decl_spec;
496    return true;
497  }
498  return false;
499}
500
501bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
502                          const char *&PrevSpec, unsigned &DiagID) {
503  if (TypeSpecType != TST_unspecified) {
504    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
505    DiagID = diag::err_invalid_vector_decl_spec_combination;
506    return true;
507  }
508  TypeAltiVecVector = isAltiVecVector;
509  AltiVecLoc = Loc;
510  return false;
511}
512
513bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
514                          const char *&PrevSpec, unsigned &DiagID) {
515  if (!TypeAltiVecVector || TypeAltiVecPixel ||
516      (TypeSpecType != TST_unspecified)) {
517    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
518    DiagID = diag::err_invalid_pixel_decl_spec_combination;
519    return true;
520  }
521  TypeAltiVecPixel = isAltiVecPixel;
522  TSTLoc = Loc;
523  return false;
524}
525
526bool DeclSpec::SetTypeSpecError() {
527  TypeSpecType = TST_error;
528  TypeSpecOwned = false;
529  TSTLoc = SourceLocation();
530  return false;
531}
532
533bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
534                           unsigned &DiagID, const LangOptions &Lang) {
535  // Duplicates turn into warnings pre-C99.
536  if ((TypeQualifiers & T) && !Lang.C99)
537    return BadSpecifier(T, T, PrevSpec, DiagID);
538  TypeQualifiers |= T;
539
540  switch (T) {
541  default: assert(0 && "Unknown type qualifier!");
542  case TQ_const:    TQ_constLoc = Loc; break;
543  case TQ_restrict: TQ_restrictLoc = Loc; break;
544  case TQ_volatile: TQ_volatileLoc = Loc; break;
545  }
546  return false;
547}
548
549bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
550                                     unsigned &DiagID) {
551  // 'inline inline' is ok.
552  FS_inline_specified = true;
553  FS_inlineLoc = Loc;
554  return false;
555}
556
557bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
558                                      unsigned &DiagID) {
559  // 'virtual virtual' is ok.
560  FS_virtual_specified = true;
561  FS_virtualLoc = Loc;
562  return false;
563}
564
565bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
566                                       unsigned &DiagID) {
567  // 'explicit explicit' is ok.
568  FS_explicit_specified = true;
569  FS_explicitLoc = Loc;
570  return false;
571}
572
573bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
574                             unsigned &DiagID) {
575  if (Friend_specified) {
576    PrevSpec = "friend";
577    DiagID = diag::ext_duplicate_declspec;
578    return true;
579  }
580
581  Friend_specified = true;
582  FriendLoc = Loc;
583  return false;
584}
585
586bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
587                                unsigned &DiagID) {
588  // 'constexpr constexpr' is ok.
589  Constexpr_specified = true;
590  ConstexprLoc = Loc;
591  return false;
592}
593
594void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
595                                     unsigned NP,
596                                     SourceLocation *ProtoLocs,
597                                     SourceLocation LAngleLoc) {
598  if (NP == 0) return;
599  ProtocolQualifiers = new Decl*[NP];
600  ProtocolLocs = new SourceLocation[NP];
601  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
602  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
603  NumProtocolQualifiers = NP;
604  ProtocolLAngleLoc = LAngleLoc;
605}
606
607void DeclSpec::SaveWrittenBuiltinSpecs() {
608  writtenBS.Sign = getTypeSpecSign();
609  writtenBS.Width = getTypeSpecWidth();
610  writtenBS.Type = getTypeSpecType();
611  // Search the list of attributes for the presence of a mode attribute.
612  writtenBS.ModeAttr = false;
613  AttributeList* attrs = getAttributes().getList();
614  while (attrs) {
615    if (attrs->getKind() == AttributeList::AT_mode) {
616      writtenBS.ModeAttr = true;
617      break;
618    }
619    attrs = attrs->getNext();
620  }
621}
622
623void DeclSpec::SaveStorageSpecifierAsWritten() {
624  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
625    // If 'extern' is part of a linkage specification,
626    // then it is not a storage class "as written".
627    StorageClassSpecAsWritten = SCS_unspecified;
628  else
629    StorageClassSpecAsWritten = StorageClassSpec;
630}
631
632/// Finish - This does final analysis of the declspec, rejecting things like
633/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
634/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
635/// DeclSpec is guaranteed self-consistent, even if an error occurred.
636void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
637  // Before possibly changing their values, save specs as written.
638  SaveWrittenBuiltinSpecs();
639  SaveStorageSpecifierAsWritten();
640
641  // Check the type specifier components first.
642
643  // Validate and finalize AltiVec vector declspec.
644  if (TypeAltiVecVector) {
645    if (TypeAltiVecBool) {
646      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
647      if (TypeSpecSign != TSS_unspecified) {
648        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
649          << getSpecifierName((TSS)TypeSpecSign);
650      }
651
652      // Only char/int are valid with vector bool. (PIM 2.1)
653      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
654           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
655        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
656          << (TypeAltiVecPixel ? "__pixel" :
657                                 getSpecifierName((TST)TypeSpecType));
658      }
659
660      // Only 'short' is valid with vector bool. (PIM 2.1)
661      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
662        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
663          << getSpecifierName((TSW)TypeSpecWidth);
664
665      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
666      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
667          (TypeSpecWidth != TSW_unspecified))
668        TypeSpecSign = TSS_unsigned;
669    }
670
671    if (TypeAltiVecPixel) {
672      //TODO: perform validation
673      TypeSpecType = TST_int;
674      TypeSpecSign = TSS_unsigned;
675      TypeSpecWidth = TSW_short;
676      TypeSpecOwned = false;
677    }
678  }
679
680  // signed/unsigned are only valid with int/char/wchar_t.
681  if (TypeSpecSign != TSS_unspecified) {
682    if (TypeSpecType == TST_unspecified)
683      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
684    else if (TypeSpecType != TST_int  &&
685             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
686      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
687        << getSpecifierName((TST)TypeSpecType);
688      // signed double -> double.
689      TypeSpecSign = TSS_unspecified;
690    }
691  }
692
693  // Validate the width of the type.
694  switch (TypeSpecWidth) {
695  case TSW_unspecified: break;
696  case TSW_short:    // short int
697  case TSW_longlong: // long long int
698    if (TypeSpecType == TST_unspecified)
699      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
700    else if (TypeSpecType != TST_int) {
701      Diag(D, TSWLoc,
702           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
703                                      : diag::err_invalid_longlong_spec)
704        <<  getSpecifierName((TST)TypeSpecType);
705      TypeSpecType = TST_int;
706      TypeSpecOwned = false;
707    }
708    break;
709  case TSW_long:  // long double, long int
710    if (TypeSpecType == TST_unspecified)
711      TypeSpecType = TST_int;  // long -> long int.
712    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
713      Diag(D, TSWLoc, diag::err_invalid_long_spec)
714        << getSpecifierName((TST)TypeSpecType);
715      TypeSpecType = TST_int;
716      TypeSpecOwned = false;
717    }
718    break;
719  }
720
721  // TODO: if the implementation does not implement _Complex or _Imaginary,
722  // disallow their use.  Need information about the backend.
723  if (TypeSpecComplex != TSC_unspecified) {
724    if (TypeSpecType == TST_unspecified) {
725      Diag(D, TSCLoc, diag::ext_plain_complex)
726        << FixItHint::CreateInsertion(
727                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
728                                                 " double");
729      TypeSpecType = TST_double;   // _Complex -> _Complex double.
730    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
731      // Note that this intentionally doesn't include _Complex _Bool.
732      Diag(D, TSTLoc, diag::ext_integer_complex);
733    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
734      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
735        << getSpecifierName((TST)TypeSpecType);
736      TypeSpecComplex = TSC_unspecified;
737    }
738  }
739
740  // C++ [class.friend]p6:
741  //   No storage-class-specifier shall appear in the decl-specifier-seq
742  //   of a friend declaration.
743  if (isFriendSpecified() && getStorageClassSpec()) {
744    DeclSpec::SCS SC = getStorageClassSpec();
745    const char *SpecName = getSpecifierName(SC);
746
747    SourceLocation SCLoc = getStorageClassSpecLoc();
748    SourceLocation SCEndLoc = SCLoc.getFileLocWithOffset(strlen(SpecName));
749
750    Diag(D, SCLoc, diag::err_friend_storage_spec)
751      << SpecName
752      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
753
754    ClearStorageClassSpecs();
755  }
756
757  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
758
759  // Okay, now we can infer the real type.
760
761  // TODO: return "auto function" and other bad things based on the real type.
762
763  // 'data definition has no type or storage class'?
764}
765
766bool DeclSpec::isMissingDeclaratorOk() {
767  TST tst = getTypeSpecType();
768  return isDeclRep(tst) && getRepAsDecl() != 0 &&
769    StorageClassSpec != DeclSpec::SCS_typedef;
770}
771
772void UnqualifiedId::clear() {
773  if (Kind == IK_TemplateId)
774    TemplateId->Destroy();
775
776  Kind = IK_Identifier;
777  Identifier = 0;
778  StartLocation = SourceLocation();
779  EndLocation = SourceLocation();
780}
781
782void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
783                                          OverloadedOperatorKind Op,
784                                          SourceLocation SymbolLocations[3]) {
785  Kind = IK_OperatorFunctionId;
786  StartLocation = OperatorLoc;
787  EndLocation = OperatorLoc;
788  OperatorFunctionId.Operator = Op;
789  for (unsigned I = 0; I != 3; ++I) {
790    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
791
792    if (SymbolLocations[I].isValid())
793      EndLocation = SymbolLocations[I];
794  }
795}
796
797bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
798                                  const char *&PrevSpec) {
799  LastLocation = Loc;
800
801  if (Specifiers & VS) {
802    PrevSpec = getSpecifierName(VS);
803    return true;
804  }
805
806  Specifiers |= VS;
807
808  switch (VS) {
809  default: assert(0 && "Unknown specifier!");
810  case VS_Override: VS_overrideLoc = Loc; break;
811  case VS_Final:    VS_finalLoc = Loc; break;
812  case VS_New:      VS_newLoc = Loc; break;
813  }
814
815  return false;
816}
817
818const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
819  switch (VS) {
820  default: assert(0 && "Unknown specifier");
821  case VS_Override: return "override";
822  case VS_Final: return "final";
823  case VS_New: return "new";
824  }
825}
826
827bool ClassVirtSpecifiers::SetSpecifier(Specifier CVS, SourceLocation Loc,
828                                       const char *&PrevSpec) {
829  if (Specifiers & CVS) {
830    PrevSpec = getSpecifierName(CVS);
831    return true;
832  }
833
834  Specifiers |= CVS;
835
836  switch (CVS) {
837  default: assert(0 && "Unknown specifier!");
838  case CVS_Final: CVS_finalLoc = Loc; break;
839  case CVS_Explicit: CVS_explicitLoc = Loc; break;
840  }
841
842  return false;
843}
844
845const char *ClassVirtSpecifiers::getSpecifierName(Specifier CVS) {
846  switch (CVS) {
847  default: assert(0 && "Unknown specifier");
848  case CVS_Final: return "final";
849  case CVS_Explicit: return "explicit";
850  }
851}
852
853