DeclSpec.cpp revision a64ccefdf0ea4e03ec88805d71b0af74950c7472 
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/LocInfoType.h"
17#include "clang/Sema/ParsedTemplate.h"
18#include "clang/AST/ASTContext.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/NestedNameSpecifier.h"
21#include "clang/AST/TypeLoc.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Basic/LangOptions.h"
24#include "llvm/ADT/STLExtras.h"
25#include "llvm/Support/ErrorHandling.h"
26#include <cstring>
27using namespace clang;
28
29
30static DiagnosticBuilder Diag(Diagnostic &D, SourceLocation Loc,
31                              unsigned DiagID) {
32  return D.Report(Loc, DiagID);
33}
34
35
36void UnqualifiedId::setTemplateId(TemplateIdAnnotation *TemplateId) {
37  assert(TemplateId && "NULL template-id annotation?");
38  Kind = IK_TemplateId;
39  this->TemplateId = TemplateId;
40  StartLocation = TemplateId->TemplateNameLoc;
41  EndLocation = TemplateId->RAngleLoc;
42}
43
44void UnqualifiedId::setConstructorTemplateId(TemplateIdAnnotation *TemplateId) {
45  assert(TemplateId && "NULL template-id annotation?");
46  Kind = IK_ConstructorTemplateId;
47  this->TemplateId = TemplateId;
48  StartLocation = TemplateId->TemplateNameLoc;
49  EndLocation = TemplateId->RAngleLoc;
50}
51
52void CXXScopeSpec::Extend(ASTContext &Context, SourceLocation TemplateKWLoc,
53                          TypeLoc TL, SourceLocation ColonColonLoc) {
54  Builder.Extend(Context, TemplateKWLoc, TL, ColonColonLoc);
55  if (Range.getBegin().isInvalid())
56    Range.setBegin(TL.getBeginLoc());
57  Range.setEnd(ColonColonLoc);
58
59  assert(Range == Builder.getSourceRange() &&
60         "NestedNameSpecifierLoc range computation incorrect");
61}
62
63void CXXScopeSpec::Extend(ASTContext &Context, IdentifierInfo *Identifier,
64                          SourceLocation IdentifierLoc,
65                          SourceLocation ColonColonLoc) {
66  Builder.Extend(Context, Identifier, IdentifierLoc, ColonColonLoc);
67
68  if (Range.getBegin().isInvalid())
69    Range.setBegin(IdentifierLoc);
70  Range.setEnd(ColonColonLoc);
71
72  assert(Range == Builder.getSourceRange() &&
73         "NestedNameSpecifierLoc range computation incorrect");
74}
75
76void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
77                          SourceLocation NamespaceLoc,
78                          SourceLocation ColonColonLoc) {
79  Builder.Extend(Context, Namespace, NamespaceLoc, ColonColonLoc);
80
81  if (Range.getBegin().isInvalid())
82    Range.setBegin(NamespaceLoc);
83  Range.setEnd(ColonColonLoc);
84
85  assert(Range == Builder.getSourceRange() &&
86         "NestedNameSpecifierLoc range computation incorrect");
87}
88
89void CXXScopeSpec::Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
90                          SourceLocation AliasLoc,
91                          SourceLocation ColonColonLoc) {
92  Builder.Extend(Context, Alias, AliasLoc, ColonColonLoc);
93
94  if (Range.getBegin().isInvalid())
95    Range.setBegin(AliasLoc);
96  Range.setEnd(ColonColonLoc);
97
98  assert(Range == Builder.getSourceRange() &&
99         "NestedNameSpecifierLoc range computation incorrect");
100}
101
102void CXXScopeSpec::MakeGlobal(ASTContext &Context,
103                              SourceLocation ColonColonLoc) {
104  Builder.MakeGlobal(Context, ColonColonLoc);
105
106  Range = SourceRange(ColonColonLoc);
107
108  assert(Range == Builder.getSourceRange() &&
109         "NestedNameSpecifierLoc range computation incorrect");
110}
111
112void CXXScopeSpec::MakeTrivial(ASTContext &Context,
113                               NestedNameSpecifier *Qualifier, SourceRange R) {
114  Builder.MakeTrivial(Context, Qualifier, R);
115  Range = R;
116}
117
118void CXXScopeSpec::Adopt(NestedNameSpecifierLoc Other) {
119  if (!Other) {
120    Range = SourceRange();
121    Builder.Clear();
122    return;
123  }
124
125  Range = Other.getSourceRange();
126  Builder.Adopt(Other);
127}
128
129SourceLocation CXXScopeSpec::getLastQualifierNameLoc() const {
130  if (!Builder.getRepresentation())
131    return SourceLocation();
132  return Builder.getTemporary().getLocalBeginLoc();
133}
134
135NestedNameSpecifierLoc
136CXXScopeSpec::getWithLocInContext(ASTContext &Context) const {
137  if (!Builder.getRepresentation())
138    return NestedNameSpecifierLoc();
139
140  return Builder.getWithLocInContext(Context);
141}
142
143/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
144/// "TheDeclarator" is the declarator that this will be added to.
145DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto, bool isVariadic,
146                                             SourceLocation EllipsisLoc,
147                                             ParamInfo *ArgInfo,
148                                             unsigned NumArgs,
149                                             unsigned TypeQuals,
150                                             bool RefQualifierIsLvalueRef,
151                                             SourceLocation RefQualifierLoc,
152                                             SourceLocation MutableLoc,
153                                             ExceptionSpecificationType
154                                                 ESpecType,
155                                             SourceLocation ESpecLoc,
156                                             ParsedType *Exceptions,
157                                             SourceRange *ExceptionRanges,
158                                             unsigned NumExceptions,
159                                             Expr *NoexceptExpr,
160                                             SourceLocation LocalRangeBegin,
161                                             SourceLocation LocalRangeEnd,
162                                             Declarator &TheDeclarator,
163                                             ParsedType TrailingReturnType) {
164  DeclaratorChunk I;
165  I.Kind                        = Function;
166  I.Loc                         = LocalRangeBegin;
167  I.EndLoc                      = LocalRangeEnd;
168  I.Fun.AttrList                = 0;
169  I.Fun.hasPrototype            = hasProto;
170  I.Fun.isVariadic              = isVariadic;
171  I.Fun.EllipsisLoc             = EllipsisLoc.getRawEncoding();
172  I.Fun.DeleteArgInfo           = false;
173  I.Fun.TypeQuals               = TypeQuals;
174  I.Fun.NumArgs                 = NumArgs;
175  I.Fun.ArgInfo                 = 0;
176  I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
177  I.Fun.RefQualifierLoc         = RefQualifierLoc.getRawEncoding();
178  I.Fun.MutableLoc              = MutableLoc.getRawEncoding();
179  I.Fun.ExceptionSpecType       = ESpecType;
180  I.Fun.ExceptionSpecLoc        = ESpecLoc.getRawEncoding();
181  I.Fun.NumExceptions           = 0;
182  I.Fun.Exceptions              = 0;
183  I.Fun.NoexceptExpr            = 0;
184  I.Fun.TrailingReturnType   = TrailingReturnType.getAsOpaquePtr();
185
186  // new[] an argument array if needed.
187  if (NumArgs) {
188    // If the 'InlineParams' in Declarator is unused and big enough, put our
189    // parameter list there (in an effort to avoid new/delete traffic).  If it
190    // is already used (consider a function returning a function pointer) or too
191    // small (function taking too many arguments), go to the heap.
192    if (!TheDeclarator.InlineParamsUsed &&
193        NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) {
194      I.Fun.ArgInfo = TheDeclarator.InlineParams;
195      I.Fun.DeleteArgInfo = false;
196      TheDeclarator.InlineParamsUsed = true;
197    } else {
198      I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs];
199      I.Fun.DeleteArgInfo = true;
200    }
201    memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs);
202  }
203
204  // Check what exception specification information we should actually store.
205  switch (ESpecType) {
206  default: break; // By default, save nothing.
207  case EST_Dynamic:
208    // new[] an exception array if needed
209    if (NumExceptions) {
210      I.Fun.NumExceptions = NumExceptions;
211      I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
212      for (unsigned i = 0; i != NumExceptions; ++i) {
213        I.Fun.Exceptions[i].Ty = Exceptions[i];
214        I.Fun.Exceptions[i].Range = ExceptionRanges[i];
215      }
216    }
217    break;
218
219  case EST_ComputedNoexcept:
220    I.Fun.NoexceptExpr = NoexceptExpr;
221    break;
222  }
223  return I;
224}
225
226bool Declarator::isDeclarationOfFunction() const {
227  for (unsigned i = 0, i_end = DeclTypeInfo.size(); i < i_end; ++i) {
228    switch (DeclTypeInfo[i].Kind) {
229    case DeclaratorChunk::Function:
230      return true;
231    case DeclaratorChunk::Paren:
232      continue;
233    case DeclaratorChunk::Pointer:
234    case DeclaratorChunk::Reference:
235    case DeclaratorChunk::Array:
236    case DeclaratorChunk::BlockPointer:
237    case DeclaratorChunk::MemberPointer:
238      return false;
239    }
240    llvm_unreachable("Invalid type chunk");
241    return false;
242  }
243
244  switch (DS.getTypeSpecType()) {
245    case TST_auto:
246    case TST_bool:
247    case TST_char:
248    case TST_char16:
249    case TST_char32:
250    case TST_class:
251    case TST_decimal128:
252    case TST_decimal32:
253    case TST_decimal64:
254    case TST_double:
255    case TST_enum:
256    case TST_error:
257    case TST_float:
258    case TST_int:
259    case TST_struct:
260    case TST_union:
261    case TST_unknown_anytype:
262    case TST_unspecified:
263    case TST_void:
264    case TST_wchar:
265      return false;
266
267    case TST_decltype:
268    case TST_typeofExpr:
269      if (Expr *E = DS.getRepAsExpr())
270        return E->getType()->isFunctionType();
271      return false;
272
273    case TST_underlyingType:
274    case TST_typename:
275    case TST_typeofType: {
276      QualType QT = DS.getRepAsType().get();
277      if (QT.isNull())
278        return false;
279
280      if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT))
281        QT = LIT->getType();
282
283      if (QT.isNull())
284        return false;
285
286      return QT->isFunctionType();
287    }
288  }
289
290  return false;
291}
292
293/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
294/// declaration specifier includes.
295///
296unsigned DeclSpec::getParsedSpecifiers() const {
297  unsigned Res = 0;
298  if (StorageClassSpec != SCS_unspecified ||
299      SCS_thread_specified)
300    Res |= PQ_StorageClassSpecifier;
301
302  if (TypeQualifiers != TQ_unspecified)
303    Res |= PQ_TypeQualifier;
304
305  if (hasTypeSpecifier())
306    Res |= PQ_TypeSpecifier;
307
308  if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified)
309    Res |= PQ_FunctionSpecifier;
310  return Res;
311}
312
313template <class T> static bool BadSpecifier(T TNew, T TPrev,
314                                            const char *&PrevSpec,
315                                            unsigned &DiagID) {
316  PrevSpec = DeclSpec::getSpecifierName(TPrev);
317  DiagID = (TNew == TPrev ? diag::ext_duplicate_declspec
318            : diag::err_invalid_decl_spec_combination);
319  return true;
320}
321
322const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
323  switch (S) {
324  case DeclSpec::SCS_unspecified: return "unspecified";
325  case DeclSpec::SCS_typedef:     return "typedef";
326  case DeclSpec::SCS_extern:      return "extern";
327  case DeclSpec::SCS_static:      return "static";
328  case DeclSpec::SCS_auto:        return "auto";
329  case DeclSpec::SCS_register:    return "register";
330  case DeclSpec::SCS_private_extern: return "__private_extern__";
331  case DeclSpec::SCS_mutable:     return "mutable";
332  }
333  llvm_unreachable("Unknown typespec!");
334}
335
336const char *DeclSpec::getSpecifierName(TSW W) {
337  switch (W) {
338  case TSW_unspecified: return "unspecified";
339  case TSW_short:       return "short";
340  case TSW_long:        return "long";
341  case TSW_longlong:    return "long long";
342  }
343  llvm_unreachable("Unknown typespec!");
344}
345
346const char *DeclSpec::getSpecifierName(TSC C) {
347  switch (C) {
348  case TSC_unspecified: return "unspecified";
349  case TSC_imaginary:   return "imaginary";
350  case TSC_complex:     return "complex";
351  }
352  llvm_unreachable("Unknown typespec!");
353}
354
355
356const char *DeclSpec::getSpecifierName(TSS S) {
357  switch (S) {
358  case TSS_unspecified: return "unspecified";
359  case TSS_signed:      return "signed";
360  case TSS_unsigned:    return "unsigned";
361  }
362  llvm_unreachable("Unknown typespec!");
363}
364
365const char *DeclSpec::getSpecifierName(DeclSpec::TST T) {
366  switch (T) {
367  case DeclSpec::TST_unspecified: return "unspecified";
368  case DeclSpec::TST_void:        return "void";
369  case DeclSpec::TST_char:        return "char";
370  case DeclSpec::TST_wchar:       return "wchar_t";
371  case DeclSpec::TST_char16:      return "char16_t";
372  case DeclSpec::TST_char32:      return "char32_t";
373  case DeclSpec::TST_int:         return "int";
374  case DeclSpec::TST_float:       return "float";
375  case DeclSpec::TST_double:      return "double";
376  case DeclSpec::TST_bool:        return "_Bool";
377  case DeclSpec::TST_decimal32:   return "_Decimal32";
378  case DeclSpec::TST_decimal64:   return "_Decimal64";
379  case DeclSpec::TST_decimal128:  return "_Decimal128";
380  case DeclSpec::TST_enum:        return "enum";
381  case DeclSpec::TST_class:       return "class";
382  case DeclSpec::TST_union:       return "union";
383  case DeclSpec::TST_struct:      return "struct";
384  case DeclSpec::TST_typename:    return "type-name";
385  case DeclSpec::TST_typeofType:
386  case DeclSpec::TST_typeofExpr:  return "typeof";
387  case DeclSpec::TST_auto:        return "auto";
388  case DeclSpec::TST_decltype:    return "(decltype)";
389  case DeclSpec::TST_underlyingType: return "__underlying_type";
390  case DeclSpec::TST_unknown_anytype: return "__unknown_anytype";
391  case DeclSpec::TST_error:       return "(error)";
392  }
393  llvm_unreachable("Unknown typespec!");
394}
395
396const char *DeclSpec::getSpecifierName(TQ T) {
397  switch (T) {
398  case DeclSpec::TQ_unspecified: return "unspecified";
399  case DeclSpec::TQ_const:       return "const";
400  case DeclSpec::TQ_restrict:    return "restrict";
401  case DeclSpec::TQ_volatile:    return "volatile";
402  }
403  llvm_unreachable("Unknown typespec!");
404}
405
406bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc,
407                                   const char *&PrevSpec,
408                                   unsigned &DiagID,
409                                   const LangOptions &Lang) {
410  // OpenCL prohibits extern, auto, register, and static
411  // It seems sensible to prohibit private_extern too
412  if (Lang.OpenCL) {
413    switch (S) {
414    case SCS_extern:
415    case SCS_private_extern:
416    case SCS_auto:
417    case SCS_register:
418    case SCS_static:
419      DiagID   = diag::err_not_opencl_storage_class_specifier;
420      PrevSpec = getSpecifierName(S);
421      return true;
422    default:
423      break;
424    }
425  }
426
427  if (StorageClassSpec != SCS_unspecified) {
428    // Maybe this is an attempt to use C++0x 'auto' outside of C++0x mode.
429    bool isInvalid = true;
430    if (TypeSpecType == TST_unspecified && Lang.CPlusPlus) {
431      if (S == SCS_auto)
432        return SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID);
433      if (StorageClassSpec == SCS_auto) {
434        isInvalid = SetTypeSpecType(TST_auto, StorageClassSpecLoc,
435                                    PrevSpec, DiagID);
436        assert(!isInvalid && "auto SCS -> TST recovery failed");
437      }
438    }
439
440    // Changing storage class is allowed only if the previous one
441    // was the 'extern' that is part of a linkage specification and
442    // the new storage class is 'typedef'.
443    if (isInvalid &&
444        !(SCS_extern_in_linkage_spec &&
445          StorageClassSpec == SCS_extern &&
446          S == SCS_typedef))
447      return BadSpecifier(S, (SCS)StorageClassSpec, PrevSpec, DiagID);
448  }
449  StorageClassSpec = S;
450  StorageClassSpecLoc = Loc;
451  assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield");
452  return false;
453}
454
455bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc,
456                                         const char *&PrevSpec,
457                                         unsigned &DiagID) {
458  if (SCS_thread_specified) {
459    PrevSpec = "__thread";
460    DiagID = diag::ext_duplicate_declspec;
461    return true;
462  }
463  SCS_thread_specified = true;
464  SCS_threadLoc = Loc;
465  return false;
466}
467
468/// These methods set the specified attribute of the DeclSpec, but return true
469/// and ignore the request if invalid (e.g. "extern" then "auto" is
470/// specified).
471bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc,
472                                const char *&PrevSpec,
473                                unsigned &DiagID) {
474  // Overwrite TSWLoc only if TypeSpecWidth was unspecified, so that
475  // for 'long long' we will keep the source location of the first 'long'.
476  if (TypeSpecWidth == TSW_unspecified)
477    TSWLoc = Loc;
478  // Allow turning long -> long long.
479  else if (W != TSW_longlong || TypeSpecWidth != TSW_long)
480    return BadSpecifier(W, (TSW)TypeSpecWidth, PrevSpec, DiagID);
481  TypeSpecWidth = W;
482  if (TypeAltiVecVector && !TypeAltiVecBool &&
483      ((TypeSpecWidth == TSW_long) || (TypeSpecWidth == TSW_longlong))) {
484    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
485    DiagID = diag::warn_vector_long_decl_spec_combination;
486    return true;
487  }
488  return false;
489}
490
491bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
492                                  const char *&PrevSpec,
493                                  unsigned &DiagID) {
494  if (TypeSpecComplex != TSC_unspecified)
495    return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
496  TypeSpecComplex = C;
497  TSCLoc = Loc;
498  return false;
499}
500
501bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc,
502                               const char *&PrevSpec,
503                               unsigned &DiagID) {
504  if (TypeSpecSign != TSS_unspecified)
505    return BadSpecifier(S, (TSS)TypeSpecSign, PrevSpec, DiagID);
506  TypeSpecSign = S;
507  TSSLoc = Loc;
508  return false;
509}
510
511bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
512                               const char *&PrevSpec,
513                               unsigned &DiagID,
514                               ParsedType Rep) {
515  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep);
516}
517
518bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
519                               SourceLocation TagNameLoc,
520                               const char *&PrevSpec,
521                               unsigned &DiagID,
522                               ParsedType Rep) {
523  assert(isTypeRep(T) && "T does not store a type");
524  assert(Rep && "no type provided!");
525  if (TypeSpecType != TST_unspecified) {
526    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
527    DiagID = diag::err_invalid_decl_spec_combination;
528    return true;
529  }
530  TypeSpecType = T;
531  TypeRep = Rep;
532  TSTLoc = TagKwLoc;
533  TSTNameLoc = TagNameLoc;
534  TypeSpecOwned = false;
535  return false;
536}
537
538bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
539                               const char *&PrevSpec,
540                               unsigned &DiagID,
541                               Expr *Rep) {
542  assert(isExprRep(T) && "T does not store an expr");
543  assert(Rep && "no expression provided!");
544  if (TypeSpecType != TST_unspecified) {
545    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
546    DiagID = diag::err_invalid_decl_spec_combination;
547    return true;
548  }
549  TypeSpecType = T;
550  ExprRep = Rep;
551  TSTLoc = Loc;
552  TSTNameLoc = Loc;
553  TypeSpecOwned = false;
554  return false;
555}
556
557bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
558                               const char *&PrevSpec,
559                               unsigned &DiagID,
560                               Decl *Rep, bool Owned) {
561  return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep, Owned);
562}
563
564bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
565                               SourceLocation TagNameLoc,
566                               const char *&PrevSpec,
567                               unsigned &DiagID,
568                               Decl *Rep, bool Owned) {
569  assert(isDeclRep(T) && "T does not store a decl");
570  // Unlike the other cases, we don't assert that we actually get a decl.
571
572  if (TypeSpecType != TST_unspecified) {
573    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
574    DiagID = diag::err_invalid_decl_spec_combination;
575    return true;
576  }
577  TypeSpecType = T;
578  DeclRep = Rep;
579  TSTLoc = TagKwLoc;
580  TSTNameLoc = TagNameLoc;
581  TypeSpecOwned = Owned;
582  return false;
583}
584
585bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
586                               const char *&PrevSpec,
587                               unsigned &DiagID) {
588  assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
589         "rep required for these type-spec kinds!");
590  if (TypeSpecType != TST_unspecified) {
591    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
592    DiagID = diag::err_invalid_decl_spec_combination;
593    return true;
594  }
595  TSTLoc = Loc;
596  TSTNameLoc = Loc;
597  if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
598    TypeAltiVecBool = true;
599    return false;
600  }
601  TypeSpecType = T;
602  TypeSpecOwned = false;
603  if (TypeAltiVecVector && !TypeAltiVecBool && (TypeSpecType == TST_double)) {
604    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
605    DiagID = diag::err_invalid_vector_decl_spec;
606    return true;
607  }
608  return false;
609}
610
611bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
612                          const char *&PrevSpec, unsigned &DiagID) {
613  if (TypeSpecType != TST_unspecified) {
614    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
615    DiagID = diag::err_invalid_vector_decl_spec_combination;
616    return true;
617  }
618  TypeAltiVecVector = isAltiVecVector;
619  AltiVecLoc = Loc;
620  return false;
621}
622
623bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
624                          const char *&PrevSpec, unsigned &DiagID) {
625  if (!TypeAltiVecVector || TypeAltiVecPixel ||
626      (TypeSpecType != TST_unspecified)) {
627    PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType);
628    DiagID = diag::err_invalid_pixel_decl_spec_combination;
629    return true;
630  }
631  TypeAltiVecPixel = isAltiVecPixel;
632  TSTLoc = Loc;
633  TSTNameLoc = Loc;
634  return false;
635}
636
637bool DeclSpec::SetTypeSpecError() {
638  TypeSpecType = TST_error;
639  TypeSpecOwned = false;
640  TSTLoc = SourceLocation();
641  TSTNameLoc = SourceLocation();
642  return false;
643}
644
645bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
646                           unsigned &DiagID, const LangOptions &Lang) {
647  // Duplicates turn into warnings pre-C99.
648  if ((TypeQualifiers & T) && !Lang.C99)
649    return BadSpecifier(T, T, PrevSpec, DiagID);
650  TypeQualifiers |= T;
651
652  switch (T) {
653  default: assert(0 && "Unknown type qualifier!");
654  case TQ_const:    TQ_constLoc = Loc; break;
655  case TQ_restrict: TQ_restrictLoc = Loc; break;
656  case TQ_volatile: TQ_volatileLoc = Loc; break;
657  }
658  return false;
659}
660
661bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
662                                     unsigned &DiagID) {
663  // 'inline inline' is ok.
664  FS_inline_specified = true;
665  FS_inlineLoc = Loc;
666  return false;
667}
668
669bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
670                                      unsigned &DiagID) {
671  // 'virtual virtual' is ok.
672  FS_virtual_specified = true;
673  FS_virtualLoc = Loc;
674  return false;
675}
676
677bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
678                                       unsigned &DiagID) {
679  // 'explicit explicit' is ok.
680  FS_explicit_specified = true;
681  FS_explicitLoc = Loc;
682  return false;
683}
684
685bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
686                             unsigned &DiagID) {
687  if (Friend_specified) {
688    PrevSpec = "friend";
689    DiagID = diag::ext_duplicate_declspec;
690    return true;
691  }
692
693  Friend_specified = true;
694  FriendLoc = Loc;
695  return false;
696}
697
698bool DeclSpec::setModulePrivateSpec(SourceLocation Loc, const char *&PrevSpec,
699                                    unsigned &DiagID) {
700  if (isModulePrivateSpecified()) {
701    PrevSpec = "__module_private__";
702    DiagID = diag::ext_duplicate_declspec;
703    return true;
704  }
705
706  ModulePrivateLoc = Loc;
707  return false;
708}
709
710bool DeclSpec::SetConstexprSpec(SourceLocation Loc, const char *&PrevSpec,
711                                unsigned &DiagID) {
712  // 'constexpr constexpr' is ok.
713  Constexpr_specified = true;
714  ConstexprLoc = Loc;
715  return false;
716}
717
718void DeclSpec::setProtocolQualifiers(Decl * const *Protos,
719                                     unsigned NP,
720                                     SourceLocation *ProtoLocs,
721                                     SourceLocation LAngleLoc) {
722  if (NP == 0) return;
723  ProtocolQualifiers = new Decl*[NP];
724  ProtocolLocs = new SourceLocation[NP];
725  memcpy((void*)ProtocolQualifiers, Protos, sizeof(Decl*)*NP);
726  memcpy(ProtocolLocs, ProtoLocs, sizeof(SourceLocation)*NP);
727  NumProtocolQualifiers = NP;
728  ProtocolLAngleLoc = LAngleLoc;
729}
730
731void DeclSpec::SaveWrittenBuiltinSpecs() {
732  writtenBS.Sign = getTypeSpecSign();
733  writtenBS.Width = getTypeSpecWidth();
734  writtenBS.Type = getTypeSpecType();
735  // Search the list of attributes for the presence of a mode attribute.
736  writtenBS.ModeAttr = false;
737  AttributeList* attrs = getAttributes().getList();
738  while (attrs) {
739    if (attrs->getKind() == AttributeList::AT_mode) {
740      writtenBS.ModeAttr = true;
741      break;
742    }
743    attrs = attrs->getNext();
744  }
745}
746
747void DeclSpec::SaveStorageSpecifierAsWritten() {
748  if (SCS_extern_in_linkage_spec && StorageClassSpec == SCS_extern)
749    // If 'extern' is part of a linkage specification,
750    // then it is not a storage class "as written".
751    StorageClassSpecAsWritten = SCS_unspecified;
752  else
753    StorageClassSpecAsWritten = StorageClassSpec;
754}
755
756/// Finish - This does final analysis of the declspec, rejecting things like
757/// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
758/// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
759/// DeclSpec is guaranteed self-consistent, even if an error occurred.
760void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) {
761  // Before possibly changing their values, save specs as written.
762  SaveWrittenBuiltinSpecs();
763  SaveStorageSpecifierAsWritten();
764
765  // Check the type specifier components first.
766
767  // Validate and finalize AltiVec vector declspec.
768  if (TypeAltiVecVector) {
769    if (TypeAltiVecBool) {
770      // Sign specifiers are not allowed with vector bool. (PIM 2.1)
771      if (TypeSpecSign != TSS_unspecified) {
772        Diag(D, TSSLoc, diag::err_invalid_vector_bool_decl_spec)
773          << getSpecifierName((TSS)TypeSpecSign);
774      }
775
776      // Only char/int are valid with vector bool. (PIM 2.1)
777      if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
778           (TypeSpecType != TST_int)) || TypeAltiVecPixel) {
779        Diag(D, TSTLoc, diag::err_invalid_vector_bool_decl_spec)
780          << (TypeAltiVecPixel ? "__pixel" :
781                                 getSpecifierName((TST)TypeSpecType));
782      }
783
784      // Only 'short' is valid with vector bool. (PIM 2.1)
785      if ((TypeSpecWidth != TSW_unspecified) && (TypeSpecWidth != TSW_short))
786        Diag(D, TSWLoc, diag::err_invalid_vector_bool_decl_spec)
787          << getSpecifierName((TSW)TypeSpecWidth);
788
789      // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
790      if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
791          (TypeSpecWidth != TSW_unspecified))
792        TypeSpecSign = TSS_unsigned;
793    }
794
795    if (TypeAltiVecPixel) {
796      //TODO: perform validation
797      TypeSpecType = TST_int;
798      TypeSpecSign = TSS_unsigned;
799      TypeSpecWidth = TSW_short;
800      TypeSpecOwned = false;
801    }
802  }
803
804  // signed/unsigned are only valid with int/char/wchar_t.
805  if (TypeSpecSign != TSS_unspecified) {
806    if (TypeSpecType == TST_unspecified)
807      TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
808    else if (TypeSpecType != TST_int  &&
809             TypeSpecType != TST_char && TypeSpecType != TST_wchar) {
810      Diag(D, TSSLoc, diag::err_invalid_sign_spec)
811        << getSpecifierName((TST)TypeSpecType);
812      // signed double -> double.
813      TypeSpecSign = TSS_unspecified;
814    }
815  }
816
817  // Validate the width of the type.
818  switch (TypeSpecWidth) {
819  case TSW_unspecified: break;
820  case TSW_short:    // short int
821  case TSW_longlong: // long long int
822    if (TypeSpecType == TST_unspecified)
823      TypeSpecType = TST_int; // short -> short int, long long -> long long int.
824    else if (TypeSpecType != TST_int) {
825      Diag(D, TSWLoc,
826           TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec
827                                      : diag::err_invalid_longlong_spec)
828        <<  getSpecifierName((TST)TypeSpecType);
829      TypeSpecType = TST_int;
830      TypeSpecOwned = false;
831    }
832    break;
833  case TSW_long:  // long double, long int
834    if (TypeSpecType == TST_unspecified)
835      TypeSpecType = TST_int;  // long -> long int.
836    else if (TypeSpecType != TST_int && TypeSpecType != TST_double) {
837      Diag(D, TSWLoc, diag::err_invalid_long_spec)
838        << getSpecifierName((TST)TypeSpecType);
839      TypeSpecType = TST_int;
840      TypeSpecOwned = false;
841    }
842    break;
843  }
844
845  // TODO: if the implementation does not implement _Complex or _Imaginary,
846  // disallow their use.  Need information about the backend.
847  if (TypeSpecComplex != TSC_unspecified) {
848    if (TypeSpecType == TST_unspecified) {
849      Diag(D, TSCLoc, diag::ext_plain_complex)
850        << FixItHint::CreateInsertion(
851                              PP.getLocForEndOfToken(getTypeSpecComplexLoc()),
852                                                 " double");
853      TypeSpecType = TST_double;   // _Complex -> _Complex double.
854    } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) {
855      // Note that this intentionally doesn't include _Complex _Bool.
856      Diag(D, TSTLoc, diag::ext_integer_complex);
857    } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) {
858      Diag(D, TSCLoc, diag::err_invalid_complex_spec)
859        << getSpecifierName((TST)TypeSpecType);
860      TypeSpecComplex = TSC_unspecified;
861    }
862  }
863
864  // If no type specifier was provided and we're parsing a language where
865  // the type specifier is not optional, but we got 'auto' as a storage
866  // class specifier, then assume this is an attempt to use C++0x's 'auto'
867  // type specifier.
868  // FIXME: Does Microsoft really support implicit int in C++?
869  if (PP.getLangOptions().CPlusPlus && !PP.getLangOptions().MicrosoftExt &&
870      TypeSpecType == TST_unspecified && StorageClassSpec == SCS_auto) {
871    TypeSpecType = TST_auto;
872    StorageClassSpec = StorageClassSpecAsWritten = SCS_unspecified;
873    TSTLoc = TSTNameLoc = StorageClassSpecLoc;
874    StorageClassSpecLoc = SourceLocation();
875  }
876  // Diagnose if we've recovered from an ill-formed 'auto' storage class
877  // specifier in a pre-C++0x dialect of C++.
878  if (!PP.getLangOptions().CPlusPlus0x && TypeSpecType == TST_auto)
879    Diag(D, TSTLoc, diag::ext_auto_type_specifier);
880  if (PP.getLangOptions().CPlusPlus && !PP.getLangOptions().CPlusPlus0x &&
881      StorageClassSpec == SCS_auto)
882    Diag(D, StorageClassSpecLoc, diag::warn_auto_storage_class)
883      << FixItHint::CreateRemoval(StorageClassSpecLoc);
884
885  // C++ [class.friend]p6:
886  //   No storage-class-specifier shall appear in the decl-specifier-seq
887  //   of a friend declaration.
888  if (isFriendSpecified() && getStorageClassSpec()) {
889    DeclSpec::SCS SC = getStorageClassSpec();
890    const char *SpecName = getSpecifierName(SC);
891
892    SourceLocation SCLoc = getStorageClassSpecLoc();
893    SourceLocation SCEndLoc = SCLoc.getLocWithOffset(strlen(SpecName));
894
895    Diag(D, SCLoc, diag::err_friend_storage_spec)
896      << SpecName
897      << FixItHint::CreateRemoval(SourceRange(SCLoc, SCEndLoc));
898
899    ClearStorageClassSpecs();
900  }
901
902  assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
903
904  // Okay, now we can infer the real type.
905
906  // TODO: return "auto function" and other bad things based on the real type.
907
908  // 'data definition has no type or storage class'?
909}
910
911bool DeclSpec::isMissingDeclaratorOk() {
912  TST tst = getTypeSpecType();
913  return isDeclRep(tst) && getRepAsDecl() != 0 &&
914    StorageClassSpec != DeclSpec::SCS_typedef;
915}
916
917void UnqualifiedId::clear() {
918  Kind = IK_Identifier;
919  Identifier = 0;
920  StartLocation = SourceLocation();
921  EndLocation = SourceLocation();
922}
923
924void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
925                                          OverloadedOperatorKind Op,
926                                          SourceLocation SymbolLocations[3]) {
927  Kind = IK_OperatorFunctionId;
928  StartLocation = OperatorLoc;
929  EndLocation = OperatorLoc;
930  OperatorFunctionId.Operator = Op;
931  for (unsigned I = 0; I != 3; ++I) {
932    OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I].getRawEncoding();
933
934    if (SymbolLocations[I].isValid())
935      EndLocation = SymbolLocations[I];
936  }
937}
938
939bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
940                                  const char *&PrevSpec) {
941  LastLocation = Loc;
942
943  if (Specifiers & VS) {
944    PrevSpec = getSpecifierName(VS);
945    return true;
946  }
947
948  Specifiers |= VS;
949
950  switch (VS) {
951  default: assert(0 && "Unknown specifier!");
952  case VS_Override: VS_overrideLoc = Loc; break;
953  case VS_Final:    VS_finalLoc = Loc; break;
954  }
955
956  return false;
957}
958
959const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
960  switch (VS) {
961  default: assert(0 && "Unknown specifier");
962  case VS_Override: return "override";
963  case VS_Final: return "final";
964  }
965}
966