SemaDeclAttr.cpp revision d77ba899b3ed39aa4bdba22aabc4bcd5ca6effdf 
1//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
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 decl-related attribute processing.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Sema/SemaInternal.h"
15#include "TargetAttributesSema.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/DeclCXX.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/AST/Expr.h"
21#include "clang/Basic/SourceManager.h"
22#include "clang/Basic/TargetInfo.h"
23#include "clang/Sema/DeclSpec.h"
24#include "clang/Sema/DelayedDiagnostic.h"
25#include "llvm/ADT/StringExtras.h"
26using namespace clang;
27using namespace sema;
28
29/// These constants match the enumerated choices of
30/// warn_attribute_wrong_decl_type and err_attribute_wrong_decl_type.
31enum AttributeDeclKind {
32  ExpectedFunction,
33  ExpectedUnion,
34  ExpectedVariableOrFunction,
35  ExpectedFunctionOrMethod,
36  ExpectedParameter,
37  ExpectedParameterOrMethod,
38  ExpectedFunctionMethodOrBlock,
39  ExpectedClassOrVirtualMethod,
40  ExpectedFunctionMethodOrParameter,
41  ExpectedClass,
42  ExpectedVirtualMethod,
43  ExpectedClassMember,
44  ExpectedVariable,
45  ExpectedMethod,
46  ExpectedVariableFunctionOrLabel,
47  ExpectedFieldOrGlobalVar
48};
49
50//===----------------------------------------------------------------------===//
51//  Helper functions
52//===----------------------------------------------------------------------===//
53
54static const FunctionType *getFunctionType(const Decl *D,
55                                           bool blocksToo = true) {
56  QualType Ty;
57  if (const ValueDecl *decl = dyn_cast<ValueDecl>(D))
58    Ty = decl->getType();
59  else if (const FieldDecl *decl = dyn_cast<FieldDecl>(D))
60    Ty = decl->getType();
61  else if (const TypedefNameDecl* decl = dyn_cast<TypedefNameDecl>(D))
62    Ty = decl->getUnderlyingType();
63  else
64    return 0;
65
66  if (Ty->isFunctionPointerType())
67    Ty = Ty->getAs<PointerType>()->getPointeeType();
68  else if (blocksToo && Ty->isBlockPointerType())
69    Ty = Ty->getAs<BlockPointerType>()->getPointeeType();
70
71  return Ty->getAs<FunctionType>();
72}
73
74// FIXME: We should provide an abstraction around a method or function
75// to provide the following bits of information.
76
77/// isFunction - Return true if the given decl has function
78/// type (function or function-typed variable).
79static bool isFunction(const Decl *D) {
80  return getFunctionType(D, false) != NULL;
81}
82
83/// isFunctionOrMethod - Return true if the given decl has function
84/// type (function or function-typed variable) or an Objective-C
85/// method.
86static bool isFunctionOrMethod(const Decl *D) {
87  return isFunction(D)|| isa<ObjCMethodDecl>(D);
88}
89
90/// isFunctionOrMethodOrBlock - Return true if the given decl has function
91/// type (function or function-typed variable) or an Objective-C
92/// method or a block.
93static bool isFunctionOrMethodOrBlock(const Decl *D) {
94  if (isFunctionOrMethod(D))
95    return true;
96  // check for block is more involved.
97  if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
98    QualType Ty = V->getType();
99    return Ty->isBlockPointerType();
100  }
101  return isa<BlockDecl>(D);
102}
103
104/// Return true if the given decl has a declarator that should have
105/// been processed by Sema::GetTypeForDeclarator.
106static bool hasDeclarator(const Decl *D) {
107  // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
108  return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
109         isa<ObjCPropertyDecl>(D);
110}
111
112/// hasFunctionProto - Return true if the given decl has a argument
113/// information. This decl should have already passed
114/// isFunctionOrMethod or isFunctionOrMethodOrBlock.
115static bool hasFunctionProto(const Decl *D) {
116  if (const FunctionType *FnTy = getFunctionType(D))
117    return isa<FunctionProtoType>(FnTy);
118  else {
119    assert(isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D));
120    return true;
121  }
122}
123
124/// getFunctionOrMethodNumArgs - Return number of function or method
125/// arguments. It is an error to call this on a K&R function (use
126/// hasFunctionProto first).
127static unsigned getFunctionOrMethodNumArgs(const Decl *D) {
128  if (const FunctionType *FnTy = getFunctionType(D))
129    return cast<FunctionProtoType>(FnTy)->getNumArgs();
130  if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
131    return BD->getNumParams();
132  return cast<ObjCMethodDecl>(D)->param_size();
133}
134
135static QualType getFunctionOrMethodArgType(const Decl *D, unsigned Idx) {
136  if (const FunctionType *FnTy = getFunctionType(D))
137    return cast<FunctionProtoType>(FnTy)->getArgType(Idx);
138  if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
139    return BD->getParamDecl(Idx)->getType();
140
141  return cast<ObjCMethodDecl>(D)->param_begin()[Idx]->getType();
142}
143
144static QualType getFunctionOrMethodResultType(const Decl *D) {
145  if (const FunctionType *FnTy = getFunctionType(D))
146    return cast<FunctionProtoType>(FnTy)->getResultType();
147  return cast<ObjCMethodDecl>(D)->getResultType();
148}
149
150static bool isFunctionOrMethodVariadic(const Decl *D) {
151  if (const FunctionType *FnTy = getFunctionType(D)) {
152    const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
153    return proto->isVariadic();
154  } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
155    return BD->isVariadic();
156  else {
157    return cast<ObjCMethodDecl>(D)->isVariadic();
158  }
159}
160
161static bool isInstanceMethod(const Decl *D) {
162  if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
163    return MethodDecl->isInstance();
164  return false;
165}
166
167static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
168  const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
169  if (!PT)
170    return false;
171
172  ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
173  if (!Cls)
174    return false;
175
176  IdentifierInfo* ClsName = Cls->getIdentifier();
177
178  // FIXME: Should we walk the chain of classes?
179  return ClsName == &Ctx.Idents.get("NSString") ||
180         ClsName == &Ctx.Idents.get("NSMutableString");
181}
182
183static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
184  const PointerType *PT = T->getAs<PointerType>();
185  if (!PT)
186    return false;
187
188  const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
189  if (!RT)
190    return false;
191
192  const RecordDecl *RD = RT->getDecl();
193  if (RD->getTagKind() != TTK_Struct)
194    return false;
195
196  return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
197}
198
199/// \brief Check if the attribute has exactly as many args as Num. May
200/// output an error.
201static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
202                                  unsigned int Num) {
203  if (Attr.getNumArgs() != Num) {
204    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Num;
205    return false;
206  }
207
208  return true;
209}
210
211
212/// \brief Check if the attribute has at least as many args as Num. May
213/// output an error.
214static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
215                                  unsigned int Num) {
216  if (Attr.getNumArgs() < Num) {
217    S.Diag(Attr.getLoc(), diag::err_attribute_too_few_arguments) << Num;
218    return false;
219  }
220
221  return true;
222}
223
224///
225/// \brief Check if passed in Decl is a field or potentially shared global var
226/// \return true if the Decl is a field or potentially shared global variable
227///
228static bool mayBeSharedVariable(const Decl *D) {
229  if (isa<FieldDecl>(D))
230    return true;
231  if (const VarDecl *vd = dyn_cast<VarDecl>(D))
232    return (vd->hasGlobalStorage() && !(vd->isThreadSpecified()));
233
234  return false;
235}
236
237/// \brief Check if the passed-in expression is of type int or bool.
238static bool isIntOrBool(Expr *Exp) {
239  QualType QT = Exp->getType();
240  return QT->isBooleanType() || QT->isIntegerType();
241}
242
243///
244/// \brief Check if passed in Decl is a pointer type.
245/// Note that this function may produce an error message.
246/// \return true if the Decl is a pointer type; false otherwise
247///
248static bool checkIsPointer(Sema &S, const Decl *D, const AttributeList &Attr) {
249  if (const ValueDecl *vd = dyn_cast<ValueDecl>(D)) {
250    QualType QT = vd->getType();
251    if (QT->isAnyPointerType())
252      return true;
253    S.Diag(Attr.getLoc(), diag::warn_pointer_attribute_wrong_type)
254      << Attr.getName()->getName() << QT;
255  } else {
256    S.Diag(Attr.getLoc(), diag::err_attribute_can_be_applied_only_to_value_decl)
257      << Attr.getName();
258  }
259  return false;
260}
261
262/// \brief Checks that the passed in QualType either is of RecordType or points
263/// to RecordType. Returns the relevant RecordType, null if it does not exit.
264static const RecordType *getRecordType(QualType QT) {
265  if (const RecordType *RT = QT->getAs<RecordType>())
266    return RT;
267
268  // Now check if we point to record type.
269  if (const PointerType *PT = QT->getAs<PointerType>())
270    return PT->getPointeeType()->getAs<RecordType>();
271
272  return 0;
273}
274
275/// \brief Thread Safety Analysis: Checks that the passed in RecordType
276/// resolves to a lockable object. May flag an error.
277static bool checkForLockableRecord(Sema &S, Decl *D, const AttributeList &Attr,
278                                   const RecordType *RT) {
279  // Flag error if could not get record type for this argument.
280  if (!RT) {
281    S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_class)
282      << Attr.getName();
283    return false;
284  }
285  // Flag error if the type is not lockable.
286  if (!RT->getDecl()->getAttr<LockableAttr>()) {
287    S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_lockable)
288      << Attr.getName();
289    return false;
290  }
291  return true;
292}
293
294/// \brief Thread Safety Analysis: Checks that all attribute arguments, starting
295/// from Sidx, resolve to a lockable object. May flag an error.
296/// \param Sidx The attribute argument index to start checking with.
297/// \param ParamIdxOk Whether an argument can be indexing into a function
298/// parameter list.
299static bool checkAttrArgsAreLockableObjs(Sema &S, Decl *D,
300                                         const AttributeList &Attr,
301                                         SmallVectorImpl<Expr*> &Args,
302                                         int Sidx = 0,
303                                         bool ParamIdxOk = false) {
304  for(unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
305    Expr *ArgExp = Attr.getArg(Idx);
306
307    if (ArgExp->isTypeDependent())
308     continue;
309
310    QualType ArgTy = ArgExp->getType();
311
312    // First see if we can just cast to record type, or point to record type.
313    const RecordType *RT = getRecordType(ArgTy);
314
315    // Now check if we index into a record type function param.
316    if(!RT && ParamIdxOk) {
317      FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
318      IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
319      if(FD && IL) {
320        unsigned int NumParams = FD->getNumParams();
321        llvm::APInt ArgValue = IL->getValue();
322        uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
323        uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
324        if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
325          S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
326            << Attr.getName() << Idx + 1 << NumParams;
327          return false;
328        }
329        ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
330        RT = getRecordType(ArgTy);
331      }
332    }
333
334    if (!checkForLockableRecord(S, D, Attr, RT))
335      return false;
336
337    Args.push_back(ArgExp);
338  }
339  return true;
340}
341
342//===----------------------------------------------------------------------===//
343// Attribute Implementations
344//===----------------------------------------------------------------------===//
345
346// FIXME: All this manual attribute parsing code is gross. At the
347// least add some helper functions to check most argument patterns (#
348// and types of args).
349
350static void handleGuardedVarAttr(Sema &S, Decl *D, const AttributeList &Attr,
351                                 bool pointer = false) {
352  assert(!Attr.isInvalid());
353
354  if (!checkAttributeNumArgs(S, Attr, 0))
355    return;
356
357  // D must be either a member field or global (potentially shared) variable.
358  if (!mayBeSharedVariable(D)) {
359    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
360      << Attr.getName() << ExpectedFieldOrGlobalVar;
361    return;
362  }
363
364  if (pointer && !checkIsPointer(S, D, Attr))
365    return;
366
367  if (pointer)
368    D->addAttr(::new (S.Context) PtGuardedVarAttr(Attr.getLoc(), S.Context));
369  else
370    D->addAttr(::new (S.Context) GuardedVarAttr(Attr.getLoc(), S.Context));
371}
372
373static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr,
374                                bool pointer = false) {
375  assert(!Attr.isInvalid());
376
377  if (!checkAttributeNumArgs(S, Attr, 1))
378    return;
379
380  Expr *Arg = Attr.getArg(0);
381
382  // D must be either a member field or global (potentially shared) variable.
383  if (!mayBeSharedVariable(D)) {
384    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
385      << Attr.getName() << ExpectedFieldOrGlobalVar;
386    return;
387  }
388
389  if (pointer && !checkIsPointer(S, D, Attr))
390    return;
391
392  if (Arg->isTypeDependent())
393    return;
394
395  // check that the argument is lockable object
396  if (!checkForLockableRecord(S, D, Attr, getRecordType(Arg->getType())))
397    return;
398
399  if (pointer)
400    D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getLoc(),
401                                                 S.Context, Arg));
402  else
403    D->addAttr(::new (S.Context) GuardedByAttr(Attr.getLoc(), S.Context, Arg));
404}
405
406
407static void handleLockableAttr(Sema &S, Decl *D, const AttributeList &Attr,
408                               bool scoped = false) {
409  assert(!Attr.isInvalid());
410
411  if (!checkAttributeNumArgs(S, Attr, 0))
412    return;
413
414  if (!isa<CXXRecordDecl>(D)) {
415    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
416      << Attr.getName() << ExpectedClass;
417    return;
418  }
419
420  if (scoped)
421    D->addAttr(::new (S.Context) ScopedLockableAttr(Attr.getLoc(), S.Context));
422  else
423    D->addAttr(::new (S.Context) LockableAttr(Attr.getLoc(), S.Context));
424}
425
426static void handleNoThreadSafetyAttr(Sema &S, Decl *D,
427                                     const AttributeList &Attr) {
428  assert(!Attr.isInvalid());
429
430  if (!checkAttributeNumArgs(S, Attr, 0))
431    return;
432
433  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
434    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
435      << Attr.getName() << ExpectedFunctionOrMethod;
436    return;
437  }
438
439  D->addAttr(::new (S.Context) NoThreadSafetyAnalysisAttr(Attr.getLoc(),
440                                                          S.Context));
441}
442
443static void handleAcquireOrderAttr(Sema &S, Decl *D, const AttributeList &Attr,
444                                   bool before) {
445  assert(!Attr.isInvalid());
446
447  if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
448    return;
449
450  // D must be either a member field or global (potentially shared) variable.
451  ValueDecl *VD = dyn_cast<ValueDecl>(D);
452  if (!VD || !mayBeSharedVariable(D)) {
453    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
454      << Attr.getName() << ExpectedFieldOrGlobalVar;
455    return;
456  }
457
458  // Check that this attribute only applies to lockable types
459  QualType QT = VD->getType();
460  if (!QT->isDependentType()) {
461    const RecordType *RT = getRecordType(QT);
462    if (!RT || !RT->getDecl()->getAttr<LockableAttr>()) {
463      S.Diag(Attr.getLoc(), diag::err_attribute_decl_not_lockable)
464              << Attr.getName();
465      return;
466    }
467  }
468
469  SmallVector<Expr*, 1> Args;
470  // check that all arguments are lockable objects
471  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args))
472    return;
473
474  unsigned Size = Args.size();
475  assert(Size == Attr.getNumArgs());
476  Expr **StartArg = Size == 0 ? 0 : &Args[0];
477
478  if (before)
479    D->addAttr(::new (S.Context) AcquiredBeforeAttr(Attr.getLoc(), S.Context,
480                                                    StartArg, Size));
481  else
482    D->addAttr(::new (S.Context) AcquiredAfterAttr(Attr.getLoc(), S.Context,
483                                                   StartArg, Size));
484}
485
486static void handleLockFunAttr(Sema &S, Decl *D, const AttributeList &Attr,
487                              bool exclusive = false) {
488  assert(!Attr.isInvalid());
489
490  // zero or more arguments ok
491
492  // check that the attribute is applied to a function
493  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
494    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
495      << Attr.getName() << ExpectedFunctionOrMethod;
496    return;
497  }
498
499  // check that all arguments are lockable objects
500  SmallVector<Expr*, 1> Args;
501  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true))
502    return;
503
504  unsigned Size = Args.size();
505  assert(Size == Attr.getNumArgs());
506  Expr **StartArg = Size == 0 ? 0 : &Args[0];
507
508  if (exclusive)
509    D->addAttr(::new (S.Context) ExclusiveLockFunctionAttr(Attr.getLoc(),
510                                                           S.Context, StartArg,
511                                                           Size));
512  else
513    D->addAttr(::new (S.Context) SharedLockFunctionAttr(Attr.getLoc(),
514                                                        S.Context, StartArg,
515                                                        Size));
516}
517
518static void handleTrylockFunAttr(Sema &S, Decl *D, const AttributeList &Attr,
519                                 bool exclusive = false) {
520  assert(!Attr.isInvalid());
521
522  if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
523    return;
524
525
526  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
527    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
528      << Attr.getName() << ExpectedFunctionOrMethod;
529    return;
530  }
531
532  if (!isIntOrBool(Attr.getArg(0))) {
533    S.Diag(Attr.getLoc(), diag::err_attribute_first_argument_not_int_or_bool)
534        << Attr.getName();
535    return;
536  }
537
538  SmallVector<Expr*, 2> Args;
539  Args.push_back(Attr.getArg(0)); //FIXME
540  // check that all arguments are lockable objects
541  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 1))
542    return;
543
544  unsigned Size = Args.size();
545  assert(Size == Attr.getNumArgs());
546  Expr **StartArg = Size == 0 ? 0 : &Args[0];
547
548  if (exclusive)
549    D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(Attr.getLoc(),
550                                                              S.Context,
551                                                              StartArg, Size));
552  else
553    D->addAttr(::new (S.Context) SharedTrylockFunctionAttr(Attr.getLoc(),
554                                                           S.Context, StartArg,
555                                                           Size));
556}
557
558static void handleLocksRequiredAttr(Sema &S, Decl *D, const AttributeList &Attr,
559                                    bool exclusive = false) {
560  assert(!Attr.isInvalid());
561
562  if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
563    return;
564
565  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
566    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
567      << Attr.getName() << ExpectedFunctionOrMethod;
568    return;
569  }
570
571  // check that all arguments are lockable objects
572  SmallVector<Expr*, 1> Args;
573  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args))
574    return;
575
576  unsigned Size = Args.size();
577  assert(Size == Attr.getNumArgs());
578  Expr **StartArg = Size == 0 ? 0 : &Args[0];
579
580  if (exclusive)
581    D->addAttr(::new (S.Context) ExclusiveLocksRequiredAttr(Attr.getLoc(),
582                                                            S.Context, StartArg,
583                                                            Size));
584  else
585    D->addAttr(::new (S.Context) SharedLocksRequiredAttr(Attr.getLoc(),
586                                                         S.Context, StartArg,
587                                                         Size));
588}
589
590static void handleUnlockFunAttr(Sema &S, Decl *D,
591                                const AttributeList &Attr) {
592  assert(!Attr.isInvalid());
593
594  // zero or more arguments ok
595
596  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
597    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
598      << Attr.getName() << ExpectedFunctionOrMethod;
599    return;
600  }
601
602  // check that all arguments are lockable objects
603  SmallVector<Expr*, 1> Args;
604  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true))
605    return;
606
607  unsigned Size = Args.size();
608  assert(Size == Attr.getNumArgs());
609  Expr **StartArg = Size == 0 ? 0 : &Args[0];
610
611  D->addAttr(::new (S.Context) UnlockFunctionAttr(Attr.getLoc(), S.Context,
612                                                  StartArg, Size));
613}
614
615static void handleLockReturnedAttr(Sema &S, Decl *D,
616                                   const AttributeList &Attr) {
617  assert(!Attr.isInvalid());
618
619  if (!checkAttributeNumArgs(S, Attr, 1))
620    return;
621  Expr *Arg = Attr.getArg(0);
622
623  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
624    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
625      << Attr.getName() << ExpectedFunctionOrMethod;
626    return;
627  }
628
629  if (Arg->isTypeDependent())
630    return;
631
632  // check that the argument is lockable object
633  if (!checkForLockableRecord(S, D, Attr, getRecordType(Arg->getType())))
634    return;
635
636  D->addAttr(::new (S.Context) LockReturnedAttr(Attr.getLoc(), S.Context, Arg));
637}
638
639static void handleLocksExcludedAttr(Sema &S, Decl *D,
640                                    const AttributeList &Attr) {
641  assert(!Attr.isInvalid());
642
643  if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
644    return;
645
646  if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) {
647    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
648      << Attr.getName() << ExpectedFunctionOrMethod;
649    return;
650  }
651
652  // check that all arguments are lockable objects
653  SmallVector<Expr*, 1> Args;
654  if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args))
655    return;
656
657  unsigned Size = Args.size();
658  assert(Size == Attr.getNumArgs());
659  Expr **StartArg = Size == 0 ? 0 : &Args[0];
660
661  D->addAttr(::new (S.Context) LocksExcludedAttr(Attr.getLoc(), S.Context,
662                                                 StartArg, Size));
663}
664
665
666static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
667                                    const AttributeList &Attr) {
668  TypedefNameDecl *tDecl = dyn_cast<TypedefNameDecl>(D);
669  if (tDecl == 0) {
670    S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef);
671    return;
672  }
673
674  QualType curType = tDecl->getUnderlyingType();
675
676  Expr *sizeExpr;
677
678  // Special case where the argument is a template id.
679  if (Attr.getParameterName()) {
680    CXXScopeSpec SS;
681    UnqualifiedId id;
682    id.setIdentifier(Attr.getParameterName(), Attr.getLoc());
683
684    ExprResult Size = S.ActOnIdExpression(scope, SS, id, false, false);
685    if (Size.isInvalid())
686      return;
687
688    sizeExpr = Size.get();
689  } else {
690    // check the attribute arguments.
691    if (!checkAttributeNumArgs(S, Attr, 1))
692      return;
693
694    sizeExpr = Attr.getArg(0);
695  }
696
697  // Instantiate/Install the vector type, and let Sema build the type for us.
698  // This will run the reguired checks.
699  QualType T = S.BuildExtVectorType(curType, sizeExpr, Attr.getLoc());
700  if (!T.isNull()) {
701    // FIXME: preserve the old source info.
702    tDecl->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(T));
703
704    // Remember this typedef decl, we will need it later for diagnostics.
705    S.ExtVectorDecls.push_back(tDecl);
706  }
707}
708
709static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
710  // check the attribute arguments.
711  if (!checkAttributeNumArgs(S, Attr, 0))
712    return;
713
714  if (TagDecl *TD = dyn_cast<TagDecl>(D))
715    TD->addAttr(::new (S.Context) PackedAttr(Attr.getLoc(), S.Context));
716  else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
717    // If the alignment is less than or equal to 8 bits, the packed attribute
718    // has no effect.
719    if (!FD->getType()->isIncompleteType() &&
720        S.Context.getTypeAlign(FD->getType()) <= 8)
721      S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
722        << Attr.getName() << FD->getType();
723    else
724      FD->addAttr(::new (S.Context) PackedAttr(Attr.getLoc(), S.Context));
725  } else
726    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
727}
728
729static void handleMsStructAttr(Sema &S, Decl *D, const AttributeList &Attr) {
730  if (TagDecl *TD = dyn_cast<TagDecl>(D))
731    TD->addAttr(::new (S.Context) MsStructAttr(Attr.getLoc(), S.Context));
732  else
733    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
734}
735
736static void handleIBAction(Sema &S, Decl *D, const AttributeList &Attr) {
737  // check the attribute arguments.
738  if (!checkAttributeNumArgs(S, Attr, 0))
739    return;
740
741  // The IBAction attributes only apply to instance methods.
742  if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
743    if (MD->isInstanceMethod()) {
744      D->addAttr(::new (S.Context) IBActionAttr(Attr.getLoc(), S.Context));
745      return;
746    }
747
748  S.Diag(Attr.getLoc(), diag::warn_attribute_ibaction) << Attr.getName();
749}
750
751static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
752  // check the attribute arguments.
753  if (!checkAttributeNumArgs(S, Attr, 0))
754    return;
755
756  // The IBOutlet attributes only apply to instance variables of
757  // Objective-C classes.
758  if (isa<ObjCIvarDecl>(D) || isa<ObjCPropertyDecl>(D)) {
759    D->addAttr(::new (S.Context) IBOutletAttr(Attr.getLoc(), S.Context));
760    return;
761  }
762
763  S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
764}
765
766static void handleIBOutletCollection(Sema &S, Decl *D,
767                                     const AttributeList &Attr) {
768
769  // The iboutletcollection attribute can have zero or one arguments.
770  if (Attr.getParameterName() && Attr.getNumArgs() > 0) {
771    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
772    return;
773  }
774
775  // The IBOutletCollection attributes only apply to instance variables of
776  // Objective-C classes.
777  if (!(isa<ObjCIvarDecl>(D) || isa<ObjCPropertyDecl>(D))) {
778    S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
779    return;
780  }
781  if (const ValueDecl *VD = dyn_cast<ValueDecl>(D))
782    if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
783      S.Diag(Attr.getLoc(), diag::err_iboutletcollection_object_type)
784        << VD->getType() << 0;
785      return;
786    }
787  if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
788    if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
789      S.Diag(Attr.getLoc(), diag::err_iboutletcollection_object_type)
790        << PD->getType() << 1;
791      return;
792    }
793
794  IdentifierInfo *II = Attr.getParameterName();
795  if (!II)
796    II = &S.Context.Idents.get("id");
797
798  ParsedType TypeRep = S.getTypeName(*II, Attr.getLoc(),
799                        S.getScopeForContext(D->getDeclContext()->getParent()));
800  if (!TypeRep) {
801    S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << II;
802    return;
803  }
804  QualType QT = TypeRep.get();
805  // Diagnose use of non-object type in iboutletcollection attribute.
806  // FIXME. Gnu attribute extension ignores use of builtin types in
807  // attributes. So, __attribute__((iboutletcollection(char))) will be
808  // treated as __attribute__((iboutletcollection())).
809  if (!QT->isObjCIdType() && !QT->isObjCClassType() &&
810      !QT->isObjCObjectType()) {
811    S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << II;
812    return;
813  }
814  D->addAttr(::new (S.Context) IBOutletCollectionAttr(Attr.getLoc(), S.Context,
815                                                      QT));
816}
817
818static void possibleTransparentUnionPointerType(QualType &T) {
819  if (const RecordType *UT = T->getAsUnionType())
820    if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
821      RecordDecl *UD = UT->getDecl();
822      for (RecordDecl::field_iterator it = UD->field_begin(),
823           itend = UD->field_end(); it != itend; ++it) {
824        QualType QT = it->getType();
825        if (QT->isAnyPointerType() || QT->isBlockPointerType()) {
826          T = QT;
827          return;
828        }
829      }
830    }
831}
832
833static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
834  // GCC ignores the nonnull attribute on K&R style function prototypes, so we
835  // ignore it as well
836  if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
837    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
838      << Attr.getName() << ExpectedFunction;
839    return;
840  }
841
842  // In C++ the implicit 'this' function parameter also counts, and they are
843  // counted from one.
844  bool HasImplicitThisParam = isInstanceMethod(D);
845  unsigned NumArgs  = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
846
847  // The nonnull attribute only applies to pointers.
848  SmallVector<unsigned, 10> NonNullArgs;
849
850  for (AttributeList::arg_iterator I=Attr.arg_begin(),
851                                   E=Attr.arg_end(); I!=E; ++I) {
852
853
854    // The argument must be an integer constant expression.
855    Expr *Ex = *I;
856    llvm::APSInt ArgNum(32);
857    if (Ex->isTypeDependent() || Ex->isValueDependent() ||
858        !Ex->isIntegerConstantExpr(ArgNum, S.Context)) {
859      S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
860        << "nonnull" << Ex->getSourceRange();
861      return;
862    }
863
864    unsigned x = (unsigned) ArgNum.getZExtValue();
865
866    if (x < 1 || x > NumArgs) {
867      S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
868       << "nonnull" << I.getArgNum() << Ex->getSourceRange();
869      return;
870    }
871
872    --x;
873    if (HasImplicitThisParam) {
874      if (x == 0) {
875        S.Diag(Attr.getLoc(),
876               diag::err_attribute_invalid_implicit_this_argument)
877          << "nonnull" << Ex->getSourceRange();
878        return;
879      }
880      --x;
881    }
882
883    // Is the function argument a pointer type?
884    QualType T = getFunctionOrMethodArgType(D, x).getNonReferenceType();
885    possibleTransparentUnionPointerType(T);
886
887    if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
888      // FIXME: Should also highlight argument in decl.
889      S.Diag(Attr.getLoc(), diag::warn_nonnull_pointers_only)
890        << "nonnull" << Ex->getSourceRange();
891      continue;
892    }
893
894    NonNullArgs.push_back(x);
895  }
896
897  // If no arguments were specified to __attribute__((nonnull)) then all pointer
898  // arguments have a nonnull attribute.
899  if (NonNullArgs.empty()) {
900    for (unsigned I = 0, E = getFunctionOrMethodNumArgs(D); I != E; ++I) {
901      QualType T = getFunctionOrMethodArgType(D, I).getNonReferenceType();
902      possibleTransparentUnionPointerType(T);
903      if (T->isAnyPointerType() || T->isBlockPointerType())
904        NonNullArgs.push_back(I);
905    }
906
907    // No pointer arguments?
908    if (NonNullArgs.empty()) {
909      // Warn the trivial case only if attribute is not coming from a
910      // macro instantiation.
911      if (Attr.getLoc().isFileID())
912        S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
913      return;
914    }
915  }
916
917  unsigned* start = &NonNullArgs[0];
918  unsigned size = NonNullArgs.size();
919  llvm::array_pod_sort(start, start + size);
920  D->addAttr(::new (S.Context) NonNullAttr(Attr.getLoc(), S.Context, start,
921                                           size));
922}
923
924static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
925  // This attribute must be applied to a function declaration.
926  // The first argument to the attribute must be a string,
927  // the name of the resource, for example "malloc".
928  // The following arguments must be argument indexes, the arguments must be
929  // of integer type for Returns, otherwise of pointer type.
930  // The difference between Holds and Takes is that a pointer may still be used
931  // after being held.  free() should be __attribute((ownership_takes)), whereas
932  // a list append function may well be __attribute((ownership_holds)).
933
934  if (!AL.getParameterName()) {
935    S.Diag(AL.getLoc(), diag::err_attribute_argument_n_not_string)
936        << AL.getName()->getName() << 1;
937    return;
938  }
939  // Figure out our Kind, and check arguments while we're at it.
940  OwnershipAttr::OwnershipKind K;
941  switch (AL.getKind()) {
942  case AttributeList::AT_ownership_takes:
943    K = OwnershipAttr::Takes;
944    if (AL.getNumArgs() < 1) {
945      S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
946      return;
947    }
948    break;
949  case AttributeList::AT_ownership_holds:
950    K = OwnershipAttr::Holds;
951    if (AL.getNumArgs() < 1) {
952      S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
953      return;
954    }
955    break;
956  case AttributeList::AT_ownership_returns:
957    K = OwnershipAttr::Returns;
958    if (AL.getNumArgs() > 1) {
959      S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments)
960          << AL.getNumArgs() + 1;
961      return;
962    }
963    break;
964  default:
965    // This should never happen given how we are called.
966    llvm_unreachable("Unknown ownership attribute");
967  }
968
969  if (!isFunction(D) || !hasFunctionProto(D)) {
970    S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
971      << AL.getName() << ExpectedFunction;
972    return;
973  }
974
975  // In C++ the implicit 'this' function parameter also counts, and they are
976  // counted from one.
977  bool HasImplicitThisParam = isInstanceMethod(D);
978  unsigned NumArgs  = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
979
980  StringRef Module = AL.getParameterName()->getName();
981
982  // Normalize the argument, __foo__ becomes foo.
983  if (Module.startswith("__") && Module.endswith("__"))
984    Module = Module.substr(2, Module.size() - 4);
985
986  SmallVector<unsigned, 10> OwnershipArgs;
987
988  for (AttributeList::arg_iterator I = AL.arg_begin(), E = AL.arg_end(); I != E;
989       ++I) {
990
991    Expr *IdxExpr = *I;
992    llvm::APSInt ArgNum(32);
993    if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent()
994        || !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) {
995      S.Diag(AL.getLoc(), diag::err_attribute_argument_not_int)
996          << AL.getName()->getName() << IdxExpr->getSourceRange();
997      continue;
998    }
999
1000    unsigned x = (unsigned) ArgNum.getZExtValue();
1001
1002    if (x > NumArgs || x < 1) {
1003      S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
1004          << AL.getName()->getName() << x << IdxExpr->getSourceRange();
1005      continue;
1006    }
1007    --x;
1008    if (HasImplicitThisParam) {
1009      if (x == 0) {
1010        S.Diag(AL.getLoc(), diag::err_attribute_invalid_implicit_this_argument)
1011          << "ownership" << IdxExpr->getSourceRange();
1012        return;
1013      }
1014      --x;
1015    }
1016
1017    switch (K) {
1018    case OwnershipAttr::Takes:
1019    case OwnershipAttr::Holds: {
1020      // Is the function argument a pointer type?
1021      QualType T = getFunctionOrMethodArgType(D, x);
1022      if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
1023        // FIXME: Should also highlight argument in decl.
1024        S.Diag(AL.getLoc(), diag::err_ownership_type)
1025            << ((K==OwnershipAttr::Takes)?"ownership_takes":"ownership_holds")
1026            << "pointer"
1027            << IdxExpr->getSourceRange();
1028        continue;
1029      }
1030      break;
1031    }
1032    case OwnershipAttr::Returns: {
1033      if (AL.getNumArgs() > 1) {
1034          // Is the function argument an integer type?
1035          Expr *IdxExpr = AL.getArg(0);
1036          llvm::APSInt ArgNum(32);
1037          if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent()
1038              || !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) {
1039            S.Diag(AL.getLoc(), diag::err_ownership_type)
1040                << "ownership_returns" << "integer"
1041                << IdxExpr->getSourceRange();
1042            return;
1043          }
1044      }
1045      break;
1046    }
1047    default:
1048      llvm_unreachable("Unknown ownership attribute");
1049    } // switch
1050
1051    // Check we don't have a conflict with another ownership attribute.
1052    for (specific_attr_iterator<OwnershipAttr>
1053          i = D->specific_attr_begin<OwnershipAttr>(),
1054          e = D->specific_attr_end<OwnershipAttr>();
1055        i != e; ++i) {
1056      if ((*i)->getOwnKind() != K) {
1057        for (const unsigned *I = (*i)->args_begin(), *E = (*i)->args_end();
1058             I!=E; ++I) {
1059          if (x == *I) {
1060            S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
1061                << AL.getName()->getName() << "ownership_*";
1062          }
1063        }
1064      }
1065    }
1066    OwnershipArgs.push_back(x);
1067  }
1068
1069  unsigned* start = OwnershipArgs.data();
1070  unsigned size = OwnershipArgs.size();
1071  llvm::array_pod_sort(start, start + size);
1072
1073  if (K != OwnershipAttr::Returns && OwnershipArgs.empty()) {
1074    S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2;
1075    return;
1076  }
1077
1078  D->addAttr(::new (S.Context) OwnershipAttr(AL.getLoc(), S.Context, K, Module,
1079                                             start, size));
1080}
1081
1082/// Whether this declaration has internal linkage for the purposes of
1083/// things that want to complain about things not have internal linkage.
1084static bool hasEffectivelyInternalLinkage(NamedDecl *D) {
1085  switch (D->getLinkage()) {
1086  case NoLinkage:
1087  case InternalLinkage:
1088    return true;
1089
1090  // Template instantiations that go from external to unique-external
1091  // shouldn't get diagnosed.
1092  case UniqueExternalLinkage:
1093    return true;
1094
1095  case ExternalLinkage:
1096    return false;
1097  }
1098  llvm_unreachable("unknown linkage kind!");
1099  return false;
1100}
1101
1102static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1103  // Check the attribute arguments.
1104  if (Attr.getNumArgs() > 1) {
1105    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1106    return;
1107  }
1108
1109  if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) {
1110    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
1111      << Attr.getName() << ExpectedVariableOrFunction;
1112    return;
1113  }
1114
1115  NamedDecl *nd = cast<NamedDecl>(D);
1116
1117  // gcc rejects
1118  // class c {
1119  //   static int a __attribute__((weakref ("v2")));
1120  //   static int b() __attribute__((weakref ("f3")));
1121  // };
1122  // and ignores the attributes of
1123  // void f(void) {
1124  //   static int a __attribute__((weakref ("v2")));
1125  // }
1126  // we reject them
1127  const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
1128  if (!Ctx->isFileContext()) {
1129    S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context) <<
1130        nd->getNameAsString();
1131    return;
1132  }
1133
1134  // The GCC manual says
1135  //
1136  // At present, a declaration to which `weakref' is attached can only
1137  // be `static'.
1138  //
1139  // It also says
1140  //
1141  // Without a TARGET,
1142  // given as an argument to `weakref' or to `alias', `weakref' is
1143  // equivalent to `weak'.
1144  //
1145  // gcc 4.4.1 will accept
1146  // int a7 __attribute__((weakref));
1147  // as
1148  // int a7 __attribute__((weak));
1149  // This looks like a bug in gcc. We reject that for now. We should revisit
1150  // it if this behaviour is actually used.
1151
1152  if (!hasEffectivelyInternalLinkage(nd)) {
1153    S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_static);
1154    return;
1155  }
1156
1157  // GCC rejects
1158  // static ((alias ("y"), weakref)).
1159  // Should we? How to check that weakref is before or after alias?
1160
1161  if (Attr.getNumArgs() == 1) {
1162    Expr *Arg = Attr.getArg(0);
1163    Arg = Arg->IgnoreParenCasts();
1164    StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
1165
1166    if (!Str || !Str->isAscii()) {
1167      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1168          << "weakref" << 1;
1169      return;
1170    }
1171    // GCC will accept anything as the argument of weakref. Should we
1172    // check for an existing decl?
1173    D->addAttr(::new (S.Context) AliasAttr(Attr.getLoc(), S.Context,
1174                                           Str->getString()));
1175  }
1176
1177  D->addAttr(::new (S.Context) WeakRefAttr(Attr.getLoc(), S.Context));
1178}
1179
1180static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1181  // check the attribute arguments.
1182  if (Attr.getNumArgs() != 1) {
1183    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1184    return;
1185  }
1186
1187  Expr *Arg = Attr.getArg(0);
1188  Arg = Arg->IgnoreParenCasts();
1189  StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
1190
1191  if (!Str || !Str->isAscii()) {
1192    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1193      << "alias" << 1;
1194    return;
1195  }
1196
1197  if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
1198    S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
1199    return;
1200  }
1201
1202  // FIXME: check if target symbol exists in current file
1203
1204  D->addAttr(::new (S.Context) AliasAttr(Attr.getLoc(), S.Context,
1205                                         Str->getString()));
1206}
1207
1208static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1209  // Check the attribute arguments.
1210  if (!checkAttributeNumArgs(S, Attr, 0))
1211    return;
1212
1213  if (!isa<FunctionDecl>(D)) {
1214    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1215      << Attr.getName() << ExpectedFunction;
1216    return;
1217  }
1218
1219  D->addAttr(::new (S.Context) NakedAttr(Attr.getLoc(), S.Context));
1220}
1221
1222static void handleAlwaysInlineAttr(Sema &S, Decl *D,
1223                                   const AttributeList &Attr) {
1224  // Check the attribute arguments.
1225  if (Attr.hasParameterOrArguments()) {
1226    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1227    return;
1228  }
1229
1230  if (!isa<FunctionDecl>(D)) {
1231    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1232      << Attr.getName() << ExpectedFunction;
1233    return;
1234  }
1235
1236  D->addAttr(::new (S.Context) AlwaysInlineAttr(Attr.getLoc(), S.Context));
1237}
1238
1239static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1240  // Check the attribute arguments.
1241  if (Attr.hasParameterOrArguments()) {
1242    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1243    return;
1244  }
1245
1246  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1247    QualType RetTy = FD->getResultType();
1248    if (RetTy->isAnyPointerType() || RetTy->isBlockPointerType()) {
1249      D->addAttr(::new (S.Context) MallocAttr(Attr.getLoc(), S.Context));
1250      return;
1251    }
1252  }
1253
1254  S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only);
1255}
1256
1257static void handleMayAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1258  // check the attribute arguments.
1259  if (!checkAttributeNumArgs(S, Attr, 0))
1260    return;
1261
1262  D->addAttr(::new (S.Context) MayAliasAttr(Attr.getLoc(), S.Context));
1263}
1264
1265static void handleNoCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1266  assert(!Attr.isInvalid());
1267  if (isa<VarDecl>(D))
1268    D->addAttr(::new (S.Context) NoCommonAttr(Attr.getLoc(), S.Context));
1269  else
1270    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1271      << Attr.getName() << ExpectedVariable;
1272}
1273
1274static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1275  assert(!Attr.isInvalid());
1276  if (isa<VarDecl>(D))
1277    D->addAttr(::new (S.Context) CommonAttr(Attr.getLoc(), S.Context));
1278  else
1279    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1280      << Attr.getName() << ExpectedVariable;
1281}
1282
1283static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) {
1284  if (hasDeclarator(D)) return;
1285
1286  if (S.CheckNoReturnAttr(attr)) return;
1287
1288  if (!isa<ObjCMethodDecl>(D)) {
1289    S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1290      << attr.getName() << ExpectedFunctionOrMethod;
1291    return;
1292  }
1293
1294  D->addAttr(::new (S.Context) NoReturnAttr(attr.getLoc(), S.Context));
1295}
1296
1297bool Sema::CheckNoReturnAttr(const AttributeList &attr) {
1298  if (attr.hasParameterOrArguments()) {
1299    Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1300    attr.setInvalid();
1301    return true;
1302  }
1303
1304  return false;
1305}
1306
1307static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
1308                                       const AttributeList &Attr) {
1309
1310  // The checking path for 'noreturn' and 'analyzer_noreturn' are different
1311  // because 'analyzer_noreturn' does not impact the type.
1312
1313  if(!checkAttributeNumArgs(S, Attr, 0))
1314      return;
1315
1316  if (!isFunctionOrMethod(D) && !isa<BlockDecl>(D)) {
1317    ValueDecl *VD = dyn_cast<ValueDecl>(D);
1318    if (VD == 0 || (!VD->getType()->isBlockPointerType()
1319                    && !VD->getType()->isFunctionPointerType())) {
1320      S.Diag(Attr.getLoc(),
1321             Attr.isCXX0XAttribute() ? diag::err_attribute_wrong_decl_type
1322             : diag::warn_attribute_wrong_decl_type)
1323        << Attr.getName() << ExpectedFunctionMethodOrBlock;
1324      return;
1325    }
1326  }
1327
1328  D->addAttr(::new (S.Context) AnalyzerNoReturnAttr(Attr.getLoc(), S.Context));
1329}
1330
1331// PS3 PPU-specific.
1332static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1333/*
1334  Returning a Vector Class in Registers
1335
1336  According to the PPU ABI specifications, a class with a single member of
1337  vector type is returned in memory when used as the return value of a function.
1338  This results in inefficient code when implementing vector classes. To return
1339  the value in a single vector register, add the vecreturn attribute to the
1340  class definition. This attribute is also applicable to struct types.
1341
1342  Example:
1343
1344  struct Vector
1345  {
1346    __vector float xyzw;
1347  } __attribute__((vecreturn));
1348
1349  Vector Add(Vector lhs, Vector rhs)
1350  {
1351    Vector result;
1352    result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
1353    return result; // This will be returned in a register
1354  }
1355*/
1356  if (!isa<RecordDecl>(D)) {
1357    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
1358      << Attr.getName() << ExpectedClass;
1359    return;
1360  }
1361
1362  if (D->getAttr<VecReturnAttr>()) {
1363    S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << "vecreturn";
1364    return;
1365  }
1366
1367  RecordDecl *record = cast<RecordDecl>(D);
1368  int count = 0;
1369
1370  if (!isa<CXXRecordDecl>(record)) {
1371    S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1372    return;
1373  }
1374
1375  if (!cast<CXXRecordDecl>(record)->isPOD()) {
1376    S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
1377    return;
1378  }
1379
1380  for (RecordDecl::field_iterator iter = record->field_begin();
1381       iter != record->field_end(); iter++) {
1382    if ((count == 1) || !iter->getType()->isVectorType()) {
1383      S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
1384      return;
1385    }
1386    count++;
1387  }
1388
1389  D->addAttr(::new (S.Context) VecReturnAttr(Attr.getLoc(), S.Context));
1390}
1391
1392static void handleDependencyAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1393  if (!isFunctionOrMethod(D) && !isa<ParmVarDecl>(D)) {
1394    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
1395      << Attr.getName() << ExpectedFunctionMethodOrParameter;
1396    return;
1397  }
1398  // FIXME: Actually store the attribute on the declaration
1399}
1400
1401static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1402  // check the attribute arguments.
1403  if (Attr.hasParameterOrArguments()) {
1404    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1405    return;
1406  }
1407
1408  if (!isa<VarDecl>(D) && !isa<ObjCIvarDecl>(D) && !isFunctionOrMethod(D) &&
1409      !isa<TypeDecl>(D) && !isa<LabelDecl>(D)) {
1410    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1411      << Attr.getName() << ExpectedVariableFunctionOrLabel;
1412    return;
1413  }
1414
1415  D->addAttr(::new (S.Context) UnusedAttr(Attr.getLoc(), S.Context));
1416}
1417
1418static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1419  // check the attribute arguments.
1420  if (Attr.hasParameterOrArguments()) {
1421    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1422    return;
1423  }
1424
1425  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1426    if (VD->hasLocalStorage() || VD->hasExternalStorage()) {
1427      S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "used";
1428      return;
1429    }
1430  } else if (!isFunctionOrMethod(D)) {
1431    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1432      << Attr.getName() << ExpectedVariableOrFunction;
1433    return;
1434  }
1435
1436  D->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context));
1437}
1438
1439static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1440  // check the attribute arguments.
1441  if (Attr.getNumArgs() > 1) {
1442    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1;
1443    return;
1444  }
1445
1446  int priority = 65535; // FIXME: Do not hardcode such constants.
1447  if (Attr.getNumArgs() > 0) {
1448    Expr *E = Attr.getArg(0);
1449    llvm::APSInt Idx(32);
1450    if (E->isTypeDependent() || E->isValueDependent() ||
1451        !E->isIntegerConstantExpr(Idx, S.Context)) {
1452      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
1453        << "constructor" << 1 << E->getSourceRange();
1454      return;
1455    }
1456    priority = Idx.getZExtValue();
1457  }
1458
1459  if (!isa<FunctionDecl>(D)) {
1460    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1461      << Attr.getName() << ExpectedFunction;
1462    return;
1463  }
1464
1465  D->addAttr(::new (S.Context) ConstructorAttr(Attr.getLoc(), S.Context,
1466                                               priority));
1467}
1468
1469static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1470  // check the attribute arguments.
1471  if (Attr.getNumArgs() > 1) {
1472    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1;
1473    return;
1474  }
1475
1476  int priority = 65535; // FIXME: Do not hardcode such constants.
1477  if (Attr.getNumArgs() > 0) {
1478    Expr *E = Attr.getArg(0);
1479    llvm::APSInt Idx(32);
1480    if (E->isTypeDependent() || E->isValueDependent() ||
1481        !E->isIntegerConstantExpr(Idx, S.Context)) {
1482      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
1483        << "destructor" << 1 << E->getSourceRange();
1484      return;
1485    }
1486    priority = Idx.getZExtValue();
1487  }
1488
1489  if (!isa<FunctionDecl>(D)) {
1490    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1491      << Attr.getName() << ExpectedFunction;
1492    return;
1493  }
1494
1495  D->addAttr(::new (S.Context) DestructorAttr(Attr.getLoc(), S.Context,
1496                                              priority));
1497}
1498
1499static void handleDeprecatedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1500  unsigned NumArgs = Attr.getNumArgs();
1501  if (NumArgs > 1) {
1502    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1;
1503    return;
1504  }
1505
1506  // Handle the case where deprecated attribute has a text message.
1507  StringRef Str;
1508  if (NumArgs == 1) {
1509    StringLiteral *SE = dyn_cast<StringLiteral>(Attr.getArg(0));
1510    if (!SE) {
1511      S.Diag(Attr.getArg(0)->getLocStart(), diag::err_attribute_not_string)
1512        << "deprecated";
1513      return;
1514    }
1515    Str = SE->getString();
1516  }
1517
1518  D->addAttr(::new (S.Context) DeprecatedAttr(Attr.getLoc(), S.Context, Str));
1519}
1520
1521static void handleUnavailableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1522  unsigned NumArgs = Attr.getNumArgs();
1523  if (NumArgs > 1) {
1524    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1;
1525    return;
1526  }
1527
1528  // Handle the case where unavailable attribute has a text message.
1529  StringRef Str;
1530  if (NumArgs == 1) {
1531    StringLiteral *SE = dyn_cast<StringLiteral>(Attr.getArg(0));
1532    if (!SE) {
1533      S.Diag(Attr.getArg(0)->getLocStart(),
1534             diag::err_attribute_not_string) << "unavailable";
1535      return;
1536    }
1537    Str = SE->getString();
1538  }
1539  D->addAttr(::new (S.Context) UnavailableAttr(Attr.getLoc(), S.Context, Str));
1540}
1541
1542static void handleArcWeakrefUnavailableAttr(Sema &S, Decl *D,
1543                                            const AttributeList &Attr) {
1544  unsigned NumArgs = Attr.getNumArgs();
1545  if (NumArgs > 0) {
1546    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 0;
1547    return;
1548  }
1549
1550  D->addAttr(::new (S.Context) ArcWeakrefUnavailableAttr(
1551                                          Attr.getLoc(), S.Context));
1552}
1553
1554static void handleAvailabilityAttr(Sema &S, Decl *D,
1555                                   const AttributeList &Attr) {
1556  IdentifierInfo *Platform = Attr.getParameterName();
1557  SourceLocation PlatformLoc = Attr.getParameterLoc();
1558
1559  StringRef PlatformName
1560    = AvailabilityAttr::getPrettyPlatformName(Platform->getName());
1561  if (PlatformName.empty()) {
1562    S.Diag(PlatformLoc, diag::warn_availability_unknown_platform)
1563      << Platform;
1564
1565    PlatformName = Platform->getName();
1566  }
1567
1568  AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
1569  AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
1570  AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
1571  bool IsUnavailable = Attr.getUnavailableLoc().isValid();
1572
1573  // Ensure that Introduced <= Deprecated <= Obsoleted (although not all
1574  // of these steps are needed).
1575  if (Introduced.isValid() && Deprecated.isValid() &&
1576      !(Introduced.Version <= Deprecated.Version)) {
1577    S.Diag(Introduced.KeywordLoc, diag::warn_availability_version_ordering)
1578      << 1 << PlatformName << Deprecated.Version.getAsString()
1579      << 0 << Introduced.Version.getAsString();
1580    return;
1581  }
1582
1583  if (Introduced.isValid() && Obsoleted.isValid() &&
1584      !(Introduced.Version <= Obsoleted.Version)) {
1585    S.Diag(Introduced.KeywordLoc, diag::warn_availability_version_ordering)
1586      << 2 << PlatformName << Obsoleted.Version.getAsString()
1587      << 0 << Introduced.Version.getAsString();
1588    return;
1589  }
1590
1591  if (Deprecated.isValid() && Obsoleted.isValid() &&
1592      !(Deprecated.Version <= Obsoleted.Version)) {
1593    S.Diag(Deprecated.KeywordLoc, diag::warn_availability_version_ordering)
1594      << 2 << PlatformName << Obsoleted.Version.getAsString()
1595      << 1 << Deprecated.Version.getAsString();
1596    return;
1597  }
1598
1599  D->addAttr(::new (S.Context) AvailabilityAttr(Attr.getLoc(), S.Context,
1600                                                Platform,
1601                                                Introduced.Version,
1602                                                Deprecated.Version,
1603                                                Obsoleted.Version,
1604                                                IsUnavailable));
1605}
1606
1607static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1608  // check the attribute arguments.
1609  if(!checkAttributeNumArgs(S, Attr, 1))
1610    return;
1611
1612  Expr *Arg = Attr.getArg(0);
1613  Arg = Arg->IgnoreParenCasts();
1614  StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
1615
1616  if (!Str || !Str->isAscii()) {
1617    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1618      << "visibility" << 1;
1619    return;
1620  }
1621
1622  StringRef TypeStr = Str->getString();
1623  VisibilityAttr::VisibilityType type;
1624
1625  if (TypeStr == "default")
1626    type = VisibilityAttr::Default;
1627  else if (TypeStr == "hidden")
1628    type = VisibilityAttr::Hidden;
1629  else if (TypeStr == "internal")
1630    type = VisibilityAttr::Hidden; // FIXME
1631  else if (TypeStr == "protected")
1632    type = VisibilityAttr::Protected;
1633  else {
1634    S.Diag(Attr.getLoc(), diag::warn_attribute_unknown_visibility) << TypeStr;
1635    return;
1636  }
1637
1638  D->addAttr(::new (S.Context) VisibilityAttr(Attr.getLoc(), S.Context, type));
1639}
1640
1641static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
1642                                       const AttributeList &Attr) {
1643  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(decl);
1644  if (!method) {
1645    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
1646      << ExpectedMethod;
1647    return;
1648  }
1649
1650  if (Attr.getNumArgs() != 0 || !Attr.getParameterName()) {
1651    if (!Attr.getParameterName() && Attr.getNumArgs() == 1) {
1652      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1653        << "objc_method_family" << 1;
1654    } else {
1655      S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1656    }
1657    Attr.setInvalid();
1658    return;
1659  }
1660
1661  StringRef param = Attr.getParameterName()->getName();
1662  ObjCMethodFamilyAttr::FamilyKind family;
1663  if (param == "none")
1664    family = ObjCMethodFamilyAttr::OMF_None;
1665  else if (param == "alloc")
1666    family = ObjCMethodFamilyAttr::OMF_alloc;
1667  else if (param == "copy")
1668    family = ObjCMethodFamilyAttr::OMF_copy;
1669  else if (param == "init")
1670    family = ObjCMethodFamilyAttr::OMF_init;
1671  else if (param == "mutableCopy")
1672    family = ObjCMethodFamilyAttr::OMF_mutableCopy;
1673  else if (param == "new")
1674    family = ObjCMethodFamilyAttr::OMF_new;
1675  else {
1676    // Just warn and ignore it.  This is future-proof against new
1677    // families being used in system headers.
1678    S.Diag(Attr.getParameterLoc(), diag::warn_unknown_method_family);
1679    return;
1680  }
1681
1682  if (family == ObjCMethodFamilyAttr::OMF_init &&
1683      !method->getResultType()->isObjCObjectPointerType()) {
1684    S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
1685      << method->getResultType();
1686    // Ignore the attribute.
1687    return;
1688  }
1689
1690  method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getLoc(),
1691                                                       S.Context, family));
1692}
1693
1694static void handleObjCExceptionAttr(Sema &S, Decl *D,
1695                                    const AttributeList &Attr) {
1696  if (!checkAttributeNumArgs(S, Attr, 0))
1697    return;
1698
1699  ObjCInterfaceDecl *OCI = dyn_cast<ObjCInterfaceDecl>(D);
1700  if (OCI == 0) {
1701    S.Diag(Attr.getLoc(), diag::err_attribute_requires_objc_interface);
1702    return;
1703  }
1704
1705  D->addAttr(::new (S.Context) ObjCExceptionAttr(Attr.getLoc(), S.Context));
1706}
1707
1708static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
1709  if (Attr.getNumArgs() != 0) {
1710    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1711    return;
1712  }
1713  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
1714    QualType T = TD->getUnderlyingType();
1715    if (!T->isPointerType() ||
1716        !T->getAs<PointerType>()->getPointeeType()->isRecordType()) {
1717      S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
1718      return;
1719    }
1720  }
1721  D->addAttr(::new (S.Context) ObjCNSObjectAttr(Attr.getLoc(), S.Context));
1722}
1723
1724static void
1725handleOverloadableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1726  if (Attr.getNumArgs() != 0) {
1727    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1728    return;
1729  }
1730
1731  if (!isa<FunctionDecl>(D)) {
1732    S.Diag(Attr.getLoc(), diag::err_attribute_overloadable_not_function);
1733    return;
1734  }
1735
1736  D->addAttr(::new (S.Context) OverloadableAttr(Attr.getLoc(), S.Context));
1737}
1738
1739static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1740  if (!Attr.getParameterName()) {
1741    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1742      << "blocks" << 1;
1743    return;
1744  }
1745
1746  if (Attr.getNumArgs() != 0) {
1747    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1748    return;
1749  }
1750
1751  BlocksAttr::BlockType type;
1752  if (Attr.getParameterName()->isStr("byref"))
1753    type = BlocksAttr::ByRef;
1754  else {
1755    S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
1756      << "blocks" << Attr.getParameterName();
1757    return;
1758  }
1759
1760  D->addAttr(::new (S.Context) BlocksAttr(Attr.getLoc(), S.Context, type));
1761}
1762
1763static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1764  // check the attribute arguments.
1765  if (Attr.getNumArgs() > 2) {
1766    S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 2;
1767    return;
1768  }
1769
1770  int sentinel = 0;
1771  if (Attr.getNumArgs() > 0) {
1772    Expr *E = Attr.getArg(0);
1773    llvm::APSInt Idx(32);
1774    if (E->isTypeDependent() || E->isValueDependent() ||
1775        !E->isIntegerConstantExpr(Idx, S.Context)) {
1776      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
1777       << "sentinel" << 1 << E->getSourceRange();
1778      return;
1779    }
1780    sentinel = Idx.getZExtValue();
1781
1782    if (sentinel < 0) {
1783      S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
1784        << E->getSourceRange();
1785      return;
1786    }
1787  }
1788
1789  int nullPos = 0;
1790  if (Attr.getNumArgs() > 1) {
1791    Expr *E = Attr.getArg(1);
1792    llvm::APSInt Idx(32);
1793    if (E->isTypeDependent() || E->isValueDependent() ||
1794        !E->isIntegerConstantExpr(Idx, S.Context)) {
1795      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
1796        << "sentinel" << 2 << E->getSourceRange();
1797      return;
1798    }
1799    nullPos = Idx.getZExtValue();
1800
1801    if (nullPos > 1 || nullPos < 0) {
1802      // FIXME: This error message could be improved, it would be nice
1803      // to say what the bounds actually are.
1804      S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
1805        << E->getSourceRange();
1806      return;
1807    }
1808  }
1809
1810  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1811    const FunctionType *FT = FD->getType()->getAs<FunctionType>();
1812    assert(FT && "FunctionDecl has non-function type?");
1813
1814    if (isa<FunctionNoProtoType>(FT)) {
1815      S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
1816      return;
1817    }
1818
1819    if (!cast<FunctionProtoType>(FT)->isVariadic()) {
1820      S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
1821      return;
1822    }
1823  } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
1824    if (!MD->isVariadic()) {
1825      S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
1826      return;
1827    }
1828  } else if (isa<BlockDecl>(D)) {
1829    // Note! BlockDecl is typeless. Variadic diagnostics will be issued by the
1830    // caller.
1831    ;
1832  } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
1833    QualType Ty = V->getType();
1834    if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
1835      const FunctionType *FT = Ty->isFunctionPointerType() ? getFunctionType(D)
1836       : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
1837      if (!cast<FunctionProtoType>(FT)->isVariadic()) {
1838        int m = Ty->isFunctionPointerType() ? 0 : 1;
1839        S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
1840        return;
1841      }
1842    } else {
1843      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1844        << Attr.getName() << ExpectedFunctionMethodOrBlock;
1845      return;
1846    }
1847  } else {
1848    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1849      << Attr.getName() << ExpectedFunctionMethodOrBlock;
1850    return;
1851  }
1852  D->addAttr(::new (S.Context) SentinelAttr(Attr.getLoc(), S.Context, sentinel,
1853                                            nullPos));
1854}
1855
1856static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
1857  // check the attribute arguments.
1858  if (!checkAttributeNumArgs(S, Attr, 0))
1859    return;
1860
1861  if (!isFunction(D) && !isa<ObjCMethodDecl>(D)) {
1862    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1863      << Attr.getName() << ExpectedFunctionOrMethod;
1864    return;
1865  }
1866
1867  if (isFunction(D) && getFunctionType(D)->getResultType()->isVoidType()) {
1868    S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
1869      << Attr.getName() << 0;
1870    return;
1871  }
1872  if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
1873    if (MD->getResultType()->isVoidType()) {
1874      S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
1875      << Attr.getName() << 1;
1876      return;
1877    }
1878
1879  D->addAttr(::new (S.Context) WarnUnusedResultAttr(Attr.getLoc(), S.Context));
1880}
1881
1882static void handleWeakAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1883  // check the attribute arguments.
1884  if (Attr.hasParameterOrArguments()) {
1885    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1886    return;
1887  }
1888
1889  if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) {
1890    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1891      << Attr.getName() << ExpectedVariableOrFunction;
1892    return;
1893  }
1894
1895  NamedDecl *nd = cast<NamedDecl>(D);
1896
1897  // 'weak' only applies to declarations with external linkage.
1898  if (hasEffectivelyInternalLinkage(nd)) {
1899    S.Diag(Attr.getLoc(), diag::err_attribute_weak_static);
1900    return;
1901  }
1902
1903  nd->addAttr(::new (S.Context) WeakAttr(Attr.getLoc(), S.Context));
1904}
1905
1906static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1907  // check the attribute arguments.
1908  if (!checkAttributeNumArgs(S, Attr, 0))
1909    return;
1910
1911
1912  // weak_import only applies to variable & function declarations.
1913  bool isDef = false;
1914  if (!D->canBeWeakImported(isDef)) {
1915    if (isDef)
1916      S.Diag(Attr.getLoc(),
1917             diag::warn_attribute_weak_import_invalid_on_definition)
1918        << "weak_import" << 2 /*variable and function*/;
1919    else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
1920             (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
1921              isa<ObjCInterfaceDecl>(D))) {
1922      // Nothing to warn about here.
1923    } else
1924      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
1925        << Attr.getName() << ExpectedVariableOrFunction;
1926
1927    return;
1928  }
1929
1930  D->addAttr(::new (S.Context) WeakImportAttr(Attr.getLoc(), S.Context));
1931}
1932
1933static void handleReqdWorkGroupSize(Sema &S, Decl *D,
1934                                    const AttributeList &Attr) {
1935  // Attribute has 3 arguments.
1936  if (!checkAttributeNumArgs(S, Attr, 3))
1937    return;
1938
1939  unsigned WGSize[3];
1940  for (unsigned i = 0; i < 3; ++i) {
1941    Expr *E = Attr.getArg(i);
1942    llvm::APSInt ArgNum(32);
1943    if (E->isTypeDependent() || E->isValueDependent() ||
1944        !E->isIntegerConstantExpr(ArgNum, S.Context)) {
1945      S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
1946        << "reqd_work_group_size" << E->getSourceRange();
1947      return;
1948    }
1949    WGSize[i] = (unsigned) ArgNum.getZExtValue();
1950  }
1951  D->addAttr(::new (S.Context) ReqdWorkGroupSizeAttr(Attr.getLoc(), S.Context,
1952                                                     WGSize[0], WGSize[1],
1953                                                     WGSize[2]));
1954}
1955
1956static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1957  // Attribute has no arguments.
1958  if (!checkAttributeNumArgs(S, Attr, 1))
1959    return;
1960
1961  // Make sure that there is a string literal as the sections's single
1962  // argument.
1963  Expr *ArgExpr = Attr.getArg(0);
1964  StringLiteral *SE = dyn_cast<StringLiteral>(ArgExpr);
1965  if (!SE) {
1966    S.Diag(ArgExpr->getLocStart(), diag::err_attribute_not_string) << "section";
1967    return;
1968  }
1969
1970  // If the target wants to validate the section specifier, make it happen.
1971  std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(SE->getString());
1972  if (!Error.empty()) {
1973    S.Diag(SE->getLocStart(), diag::err_attribute_section_invalid_for_target)
1974    << Error;
1975    return;
1976  }
1977
1978  // This attribute cannot be applied to local variables.
1979  if (isa<VarDecl>(D) && cast<VarDecl>(D)->hasLocalStorage()) {
1980    S.Diag(SE->getLocStart(), diag::err_attribute_section_local_variable);
1981    return;
1982  }
1983
1984  D->addAttr(::new (S.Context) SectionAttr(Attr.getLoc(), S.Context,
1985                                           SE->getString()));
1986}
1987
1988
1989static void handleNothrowAttr(Sema &S, Decl *D, const AttributeList &Attr) {
1990  // check the attribute arguments.
1991  if (Attr.hasParameterOrArguments()) {
1992    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
1993    return;
1994  }
1995
1996  if (NoThrowAttr *Existing = D->getAttr<NoThrowAttr>()) {
1997    if (Existing->getLocation().isInvalid())
1998      Existing->setLocation(Attr.getLoc());
1999  } else {
2000    D->addAttr(::new (S.Context) NoThrowAttr(Attr.getLoc(), S.Context));
2001  }
2002}
2003
2004static void handleConstAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2005  // check the attribute arguments.
2006  if (Attr.hasParameterOrArguments()) {
2007    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
2008    return;
2009  }
2010
2011  if (ConstAttr *Existing = D->getAttr<ConstAttr>()) {
2012   if (Existing->getLocation().isInvalid())
2013     Existing->setLocation(Attr.getLoc());
2014  } else {
2015    D->addAttr(::new (S.Context) ConstAttr(Attr.getLoc(), S.Context));
2016  }
2017}
2018
2019static void handlePureAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2020  // check the attribute arguments.
2021  if (!checkAttributeNumArgs(S, Attr, 0))
2022    return;
2023
2024  D->addAttr(::new (S.Context) PureAttr(Attr.getLoc(), S.Context));
2025}
2026
2027static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2028  if (!Attr.getParameterName()) {
2029    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
2030    return;
2031  }
2032
2033  if (Attr.getNumArgs() != 0) {
2034    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
2035    return;
2036  }
2037
2038  VarDecl *VD = dyn_cast<VarDecl>(D);
2039
2040  if (!VD || !VD->hasLocalStorage()) {
2041    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "cleanup";
2042    return;
2043  }
2044
2045  // Look up the function
2046  // FIXME: Lookup probably isn't looking in the right place
2047  NamedDecl *CleanupDecl
2048    = S.LookupSingleName(S.TUScope, Attr.getParameterName(),
2049                         Attr.getParameterLoc(), Sema::LookupOrdinaryName);
2050  if (!CleanupDecl) {
2051    S.Diag(Attr.getParameterLoc(), diag::err_attribute_cleanup_arg_not_found) <<
2052      Attr.getParameterName();
2053    return;
2054  }
2055
2056  FunctionDecl *FD = dyn_cast<FunctionDecl>(CleanupDecl);
2057  if (!FD) {
2058    S.Diag(Attr.getParameterLoc(),
2059           diag::err_attribute_cleanup_arg_not_function)
2060      << Attr.getParameterName();
2061    return;
2062  }
2063
2064  if (FD->getNumParams() != 1) {
2065    S.Diag(Attr.getParameterLoc(),
2066           diag::err_attribute_cleanup_func_must_take_one_arg)
2067      << Attr.getParameterName();
2068    return;
2069  }
2070
2071  // We're currently more strict than GCC about what function types we accept.
2072  // If this ever proves to be a problem it should be easy to fix.
2073  QualType Ty = S.Context.getPointerType(VD->getType());
2074  QualType ParamTy = FD->getParamDecl(0)->getType();
2075  if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
2076                                   ParamTy, Ty) != Sema::Compatible) {
2077    S.Diag(Attr.getParameterLoc(),
2078           diag::err_attribute_cleanup_func_arg_incompatible_type) <<
2079      Attr.getParameterName() << ParamTy << Ty;
2080    return;
2081  }
2082
2083  D->addAttr(::new (S.Context) CleanupAttr(Attr.getLoc(), S.Context, FD));
2084  S.MarkDeclarationReferenced(Attr.getParameterLoc(), FD);
2085}
2086
2087/// Handle __attribute__((format_arg((idx)))) attribute based on
2088/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2089static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2090  if (!checkAttributeNumArgs(S, Attr, 1))
2091    return;
2092
2093  if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
2094    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2095      << Attr.getName() << ExpectedFunction;
2096    return;
2097  }
2098
2099  // In C++ the implicit 'this' function parameter also counts, and they are
2100  // counted from one.
2101  bool HasImplicitThisParam = isInstanceMethod(D);
2102  unsigned NumArgs  = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
2103  unsigned FirstIdx = 1;
2104
2105  // checks for the 2nd argument
2106  Expr *IdxExpr = Attr.getArg(0);
2107  llvm::APSInt Idx(32);
2108  if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
2109      !IdxExpr->isIntegerConstantExpr(Idx, S.Context)) {
2110    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
2111    << "format" << 2 << IdxExpr->getSourceRange();
2112    return;
2113  }
2114
2115  if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) {
2116    S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2117    << "format" << 2 << IdxExpr->getSourceRange();
2118    return;
2119  }
2120
2121  unsigned ArgIdx = Idx.getZExtValue() - 1;
2122
2123  if (HasImplicitThisParam) {
2124    if (ArgIdx == 0) {
2125      S.Diag(Attr.getLoc(), diag::err_attribute_invalid_implicit_this_argument)
2126        << "format_arg" << IdxExpr->getSourceRange();
2127      return;
2128    }
2129    ArgIdx--;
2130  }
2131
2132  // make sure the format string is really a string
2133  QualType Ty = getFunctionOrMethodArgType(D, ArgIdx);
2134
2135  bool not_nsstring_type = !isNSStringType(Ty, S.Context);
2136  if (not_nsstring_type &&
2137      !isCFStringType(Ty, S.Context) &&
2138      (!Ty->isPointerType() ||
2139       !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2140    // FIXME: Should highlight the actual expression that has the wrong type.
2141    S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2142    << (not_nsstring_type ? "a string type" : "an NSString")
2143       << IdxExpr->getSourceRange();
2144    return;
2145  }
2146  Ty = getFunctionOrMethodResultType(D);
2147  if (!isNSStringType(Ty, S.Context) &&
2148      !isCFStringType(Ty, S.Context) &&
2149      (!Ty->isPointerType() ||
2150       !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
2151    // FIXME: Should highlight the actual expression that has the wrong type.
2152    S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
2153    << (not_nsstring_type ? "string type" : "NSString")
2154       << IdxExpr->getSourceRange();
2155    return;
2156  }
2157
2158  D->addAttr(::new (S.Context) FormatArgAttr(Attr.getLoc(), S.Context,
2159                                             Idx.getZExtValue()));
2160}
2161
2162enum FormatAttrKind {
2163  CFStringFormat,
2164  NSStringFormat,
2165  StrftimeFormat,
2166  SupportedFormat,
2167  IgnoredFormat,
2168  InvalidFormat
2169};
2170
2171/// getFormatAttrKind - Map from format attribute names to supported format
2172/// types.
2173static FormatAttrKind getFormatAttrKind(StringRef Format) {
2174  // Check for formats that get handled specially.
2175  if (Format == "NSString")
2176    return NSStringFormat;
2177  if (Format == "CFString")
2178    return CFStringFormat;
2179  if (Format == "strftime")
2180    return StrftimeFormat;
2181
2182  // Otherwise, check for supported formats.
2183  if (Format == "scanf" || Format == "printf" || Format == "printf0" ||
2184      Format == "strfmon" || Format == "cmn_err" || Format == "strftime" ||
2185      Format == "NSString" || Format == "CFString" || Format == "vcmn_err" ||
2186      Format == "zcmn_err" ||
2187      Format == "kprintf")  // OpenBSD.
2188    return SupportedFormat;
2189
2190  if (Format == "gcc_diag" || Format == "gcc_cdiag" ||
2191      Format == "gcc_cxxdiag" || Format == "gcc_tdiag")
2192    return IgnoredFormat;
2193
2194  return InvalidFormat;
2195}
2196
2197/// Handle __attribute__((init_priority(priority))) attributes based on
2198/// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
2199static void handleInitPriorityAttr(Sema &S, Decl *D,
2200                                   const AttributeList &Attr) {
2201  if (!S.getLangOptions().CPlusPlus) {
2202    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
2203    return;
2204  }
2205
2206  if (!isa<VarDecl>(D) || S.getCurFunctionOrMethodDecl()) {
2207    S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2208    Attr.setInvalid();
2209    return;
2210  }
2211  QualType T = dyn_cast<VarDecl>(D)->getType();
2212  if (S.Context.getAsArrayType(T))
2213    T = S.Context.getBaseElementType(T);
2214  if (!T->getAs<RecordType>()) {
2215    S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
2216    Attr.setInvalid();
2217    return;
2218  }
2219
2220  if (Attr.getNumArgs() != 1) {
2221    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
2222    Attr.setInvalid();
2223    return;
2224  }
2225  Expr *priorityExpr = Attr.getArg(0);
2226
2227  llvm::APSInt priority(32);
2228  if (priorityExpr->isTypeDependent() || priorityExpr->isValueDependent() ||
2229      !priorityExpr->isIntegerConstantExpr(priority, S.Context)) {
2230    S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
2231    << "init_priority" << priorityExpr->getSourceRange();
2232    Attr.setInvalid();
2233    return;
2234  }
2235  unsigned prioritynum = priority.getZExtValue();
2236  if (prioritynum < 101 || prioritynum > 65535) {
2237    S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
2238    <<  priorityExpr->getSourceRange();
2239    Attr.setInvalid();
2240    return;
2241  }
2242  D->addAttr(::new (S.Context) InitPriorityAttr(Attr.getLoc(), S.Context,
2243                                                prioritynum));
2244}
2245
2246/// Handle __attribute__((format(type,idx,firstarg))) attributes based on
2247/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
2248static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2249
2250  if (!Attr.getParameterName()) {
2251    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
2252      << "format" << 1;
2253    return;
2254  }
2255
2256  if (Attr.getNumArgs() != 2) {
2257    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 3;
2258    return;
2259  }
2260
2261  if (!isFunctionOrMethodOrBlock(D) || !hasFunctionProto(D)) {
2262    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2263      << Attr.getName() << ExpectedFunction;
2264    return;
2265  }
2266
2267  // In C++ the implicit 'this' function parameter also counts, and they are
2268  // counted from one.
2269  bool HasImplicitThisParam = isInstanceMethod(D);
2270  unsigned NumArgs  = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam;
2271  unsigned FirstIdx = 1;
2272
2273  StringRef Format = Attr.getParameterName()->getName();
2274
2275  // Normalize the argument, __foo__ becomes foo.
2276  if (Format.startswith("__") && Format.endswith("__"))
2277    Format = Format.substr(2, Format.size() - 4);
2278
2279  // Check for supported formats.
2280  FormatAttrKind Kind = getFormatAttrKind(Format);
2281
2282  if (Kind == IgnoredFormat)
2283    return;
2284
2285  if (Kind == InvalidFormat) {
2286    S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
2287      << "format" << Attr.getParameterName()->getName();
2288    return;
2289  }
2290
2291  // checks for the 2nd argument
2292  Expr *IdxExpr = Attr.getArg(0);
2293  llvm::APSInt Idx(32);
2294  if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
2295      !IdxExpr->isIntegerConstantExpr(Idx, S.Context)) {
2296    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
2297      << "format" << 2 << IdxExpr->getSourceRange();
2298    return;
2299  }
2300
2301  if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) {
2302    S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2303      << "format" << 2 << IdxExpr->getSourceRange();
2304    return;
2305  }
2306
2307  // FIXME: Do we need to bounds check?
2308  unsigned ArgIdx = Idx.getZExtValue() - 1;
2309
2310  if (HasImplicitThisParam) {
2311    if (ArgIdx == 0) {
2312      S.Diag(Attr.getLoc(),
2313             diag::err_format_attribute_implicit_this_format_string)
2314        << IdxExpr->getSourceRange();
2315      return;
2316    }
2317    ArgIdx--;
2318  }
2319
2320  // make sure the format string is really a string
2321  QualType Ty = getFunctionOrMethodArgType(D, ArgIdx);
2322
2323  if (Kind == CFStringFormat) {
2324    if (!isCFStringType(Ty, S.Context)) {
2325      S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2326        << "a CFString" << IdxExpr->getSourceRange();
2327      return;
2328    }
2329  } else if (Kind == NSStringFormat) {
2330    // FIXME: do we need to check if the type is NSString*?  What are the
2331    // semantics?
2332    if (!isNSStringType(Ty, S.Context)) {
2333      // FIXME: Should highlight the actual expression that has the wrong type.
2334      S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2335        << "an NSString" << IdxExpr->getSourceRange();
2336      return;
2337    }
2338  } else if (!Ty->isPointerType() ||
2339             !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
2340    // FIXME: Should highlight the actual expression that has the wrong type.
2341    S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
2342      << "a string type" << IdxExpr->getSourceRange();
2343    return;
2344  }
2345
2346  // check the 3rd argument
2347  Expr *FirstArgExpr = Attr.getArg(1);
2348  llvm::APSInt FirstArg(32);
2349  if (FirstArgExpr->isTypeDependent() || FirstArgExpr->isValueDependent() ||
2350      !FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) {
2351    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
2352      << "format" << 3 << FirstArgExpr->getSourceRange();
2353    return;
2354  }
2355
2356  // check if the function is variadic if the 3rd argument non-zero
2357  if (FirstArg != 0) {
2358    if (isFunctionOrMethodVariadic(D)) {
2359      ++NumArgs; // +1 for ...
2360    } else {
2361      S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
2362      return;
2363    }
2364  }
2365
2366  // strftime requires FirstArg to be 0 because it doesn't read from any
2367  // variable the input is just the current time + the format string.
2368  if (Kind == StrftimeFormat) {
2369    if (FirstArg != 0) {
2370      S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
2371        << FirstArgExpr->getSourceRange();
2372      return;
2373    }
2374  // if 0 it disables parameter checking (to use with e.g. va_list)
2375  } else if (FirstArg != 0 && FirstArg != NumArgs) {
2376    S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
2377      << "format" << 3 << FirstArgExpr->getSourceRange();
2378    return;
2379  }
2380
2381  // Check whether we already have an equivalent format attribute.
2382  for (specific_attr_iterator<FormatAttr>
2383         i = D->specific_attr_begin<FormatAttr>(),
2384         e = D->specific_attr_end<FormatAttr>();
2385       i != e ; ++i) {
2386    FormatAttr *f = *i;
2387    if (f->getType() == Format &&
2388        f->getFormatIdx() == (int)Idx.getZExtValue() &&
2389        f->getFirstArg() == (int)FirstArg.getZExtValue()) {
2390      // If we don't have a valid location for this attribute, adopt the
2391      // location.
2392      if (f->getLocation().isInvalid())
2393        f->setLocation(Attr.getLoc());
2394      return;
2395    }
2396  }
2397
2398  D->addAttr(::new (S.Context) FormatAttr(Attr.getLoc(), S.Context, Format,
2399                                          Idx.getZExtValue(),
2400                                          FirstArg.getZExtValue()));
2401}
2402
2403static void handleTransparentUnionAttr(Sema &S, Decl *D,
2404                                       const AttributeList &Attr) {
2405  // check the attribute arguments.
2406  if (!checkAttributeNumArgs(S, Attr, 0))
2407    return;
2408
2409
2410  // Try to find the underlying union declaration.
2411  RecordDecl *RD = 0;
2412  TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
2413  if (TD && TD->getUnderlyingType()->isUnionType())
2414    RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
2415  else
2416    RD = dyn_cast<RecordDecl>(D);
2417
2418  if (!RD || !RD->isUnion()) {
2419    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2420      << Attr.getName() << ExpectedUnion;
2421    return;
2422  }
2423
2424  if (!RD->isDefinition()) {
2425    S.Diag(Attr.getLoc(),
2426        diag::warn_transparent_union_attribute_not_definition);
2427    return;
2428  }
2429
2430  RecordDecl::field_iterator Field = RD->field_begin(),
2431                          FieldEnd = RD->field_end();
2432  if (Field == FieldEnd) {
2433    S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
2434    return;
2435  }
2436
2437  FieldDecl *FirstField = *Field;
2438  QualType FirstType = FirstField->getType();
2439  if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
2440    S.Diag(FirstField->getLocation(),
2441           diag::warn_transparent_union_attribute_floating)
2442      << FirstType->isVectorType() << FirstType;
2443    return;
2444  }
2445
2446  uint64_t FirstSize = S.Context.getTypeSize(FirstType);
2447  uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
2448  for (; Field != FieldEnd; ++Field) {
2449    QualType FieldType = Field->getType();
2450    if (S.Context.getTypeSize(FieldType) != FirstSize ||
2451        S.Context.getTypeAlign(FieldType) != FirstAlign) {
2452      // Warn if we drop the attribute.
2453      bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
2454      unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
2455                                 : S.Context.getTypeAlign(FieldType);
2456      S.Diag(Field->getLocation(),
2457          diag::warn_transparent_union_attribute_field_size_align)
2458        << isSize << Field->getDeclName() << FieldBits;
2459      unsigned FirstBits = isSize? FirstSize : FirstAlign;
2460      S.Diag(FirstField->getLocation(),
2461             diag::note_transparent_union_first_field_size_align)
2462        << isSize << FirstBits;
2463      return;
2464    }
2465  }
2466
2467  RD->addAttr(::new (S.Context) TransparentUnionAttr(Attr.getLoc(), S.Context));
2468}
2469
2470static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2471  // check the attribute arguments.
2472  if (!checkAttributeNumArgs(S, Attr, 1))
2473    return;
2474
2475  Expr *ArgExpr = Attr.getArg(0);
2476  StringLiteral *SE = dyn_cast<StringLiteral>(ArgExpr);
2477
2478  // Make sure that there is a string literal as the annotation's single
2479  // argument.
2480  if (!SE) {
2481    S.Diag(ArgExpr->getLocStart(), diag::err_attribute_not_string) <<"annotate";
2482    return;
2483  }
2484  D->addAttr(::new (S.Context) AnnotateAttr(Attr.getLoc(), S.Context,
2485                                            SE->getString()));
2486}
2487
2488static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2489  // check the attribute arguments.
2490  if (Attr.getNumArgs() > 1) {
2491    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
2492    return;
2493  }
2494
2495  //FIXME: The C++0x version of this attribute has more limited applicabilty
2496  //       than GNU's, and should error out when it is used to specify a
2497  //       weaker alignment, rather than being silently ignored.
2498
2499  if (Attr.getNumArgs() == 0) {
2500    D->addAttr(::new (S.Context) AlignedAttr(Attr.getLoc(), S.Context, true, 0));
2501    return;
2502  }
2503
2504  S.AddAlignedAttr(Attr.getLoc(), D, Attr.getArg(0));
2505}
2506
2507void Sema::AddAlignedAttr(SourceLocation AttrLoc, Decl *D, Expr *E) {
2508  if (E->isTypeDependent() || E->isValueDependent()) {
2509    // Save dependent expressions in the AST to be instantiated.
2510    D->addAttr(::new (Context) AlignedAttr(AttrLoc, Context, true, E));
2511    return;
2512  }
2513
2514  // FIXME: Cache the number on the Attr object?
2515  llvm::APSInt Alignment(32);
2516  if (!E->isIntegerConstantExpr(Alignment, Context)) {
2517    Diag(AttrLoc, diag::err_attribute_argument_not_int)
2518      << "aligned" << E->getSourceRange();
2519    return;
2520  }
2521  if (!llvm::isPowerOf2_64(Alignment.getZExtValue())) {
2522    Diag(AttrLoc, diag::err_attribute_aligned_not_power_of_two)
2523      << E->getSourceRange();
2524    return;
2525  }
2526
2527  D->addAttr(::new (Context) AlignedAttr(AttrLoc, Context, true, E));
2528}
2529
2530void Sema::AddAlignedAttr(SourceLocation AttrLoc, Decl *D, TypeSourceInfo *TS) {
2531  // FIXME: Cache the number on the Attr object if non-dependent?
2532  // FIXME: Perform checking of type validity
2533  D->addAttr(::new (Context) AlignedAttr(AttrLoc, Context, false, TS));
2534  return;
2535}
2536
2537/// handleModeAttr - This attribute modifies the width of a decl with primitive
2538/// type.
2539///
2540/// Despite what would be logical, the mode attribute is a decl attribute, not a
2541/// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be
2542/// HImode, not an intermediate pointer.
2543static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2544  // This attribute isn't documented, but glibc uses it.  It changes
2545  // the width of an int or unsigned int to the specified size.
2546
2547  // Check that there aren't any arguments
2548  if (!checkAttributeNumArgs(S, Attr, 0))
2549    return;
2550
2551
2552  IdentifierInfo *Name = Attr.getParameterName();
2553  if (!Name) {
2554    S.Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name);
2555    return;
2556  }
2557
2558  StringRef Str = Attr.getParameterName()->getName();
2559
2560  // Normalize the attribute name, __foo__ becomes foo.
2561  if (Str.startswith("__") && Str.endswith("__"))
2562    Str = Str.substr(2, Str.size() - 4);
2563
2564  unsigned DestWidth = 0;
2565  bool IntegerMode = true;
2566  bool ComplexMode = false;
2567  switch (Str.size()) {
2568  case 2:
2569    switch (Str[0]) {
2570    case 'Q': DestWidth = 8; break;
2571    case 'H': DestWidth = 16; break;
2572    case 'S': DestWidth = 32; break;
2573    case 'D': DestWidth = 64; break;
2574    case 'X': DestWidth = 96; break;
2575    case 'T': DestWidth = 128; break;
2576    }
2577    if (Str[1] == 'F') {
2578      IntegerMode = false;
2579    } else if (Str[1] == 'C') {
2580      IntegerMode = false;
2581      ComplexMode = true;
2582    } else if (Str[1] != 'I') {
2583      DestWidth = 0;
2584    }
2585    break;
2586  case 4:
2587    // FIXME: glibc uses 'word' to define register_t; this is narrower than a
2588    // pointer on PIC16 and other embedded platforms.
2589    if (Str == "word")
2590      DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
2591    else if (Str == "byte")
2592      DestWidth = S.Context.getTargetInfo().getCharWidth();
2593    break;
2594  case 7:
2595    if (Str == "pointer")
2596      DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
2597    break;
2598  }
2599
2600  QualType OldTy;
2601  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
2602    OldTy = TD->getUnderlyingType();
2603  else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
2604    OldTy = VD->getType();
2605  else {
2606    S.Diag(D->getLocation(), diag::err_attr_wrong_decl)
2607      << "mode" << SourceRange(Attr.getLoc(), Attr.getLoc());
2608    return;
2609  }
2610
2611  if (!OldTy->getAs<BuiltinType>() && !OldTy->isComplexType())
2612    S.Diag(Attr.getLoc(), diag::err_mode_not_primitive);
2613  else if (IntegerMode) {
2614    if (!OldTy->isIntegralOrEnumerationType())
2615      S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2616  } else if (ComplexMode) {
2617    if (!OldTy->isComplexType())
2618      S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2619  } else {
2620    if (!OldTy->isFloatingType())
2621      S.Diag(Attr.getLoc(), diag::err_mode_wrong_type);
2622  }
2623
2624  // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t
2625  // and friends, at least with glibc.
2626  // FIXME: Make sure 32/64-bit integers don't get defined to types of the wrong
2627  // width on unusual platforms.
2628  // FIXME: Make sure floating-point mappings are accurate
2629  // FIXME: Support XF and TF types
2630  QualType NewTy;
2631  switch (DestWidth) {
2632  case 0:
2633    S.Diag(Attr.getLoc(), diag::err_unknown_machine_mode) << Name;
2634    return;
2635  default:
2636    S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name;
2637    return;
2638  case 8:
2639    if (!IntegerMode) {
2640      S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name;
2641      return;
2642    }
2643    if (OldTy->isSignedIntegerType())
2644      NewTy = S.Context.SignedCharTy;
2645    else
2646      NewTy = S.Context.UnsignedCharTy;
2647    break;
2648  case 16:
2649    if (!IntegerMode) {
2650      S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name;
2651      return;
2652    }
2653    if (OldTy->isSignedIntegerType())
2654      NewTy = S.Context.ShortTy;
2655    else
2656      NewTy = S.Context.UnsignedShortTy;
2657    break;
2658  case 32:
2659    if (!IntegerMode)
2660      NewTy = S.Context.FloatTy;
2661    else if (OldTy->isSignedIntegerType())
2662      NewTy = S.Context.IntTy;
2663    else
2664      NewTy = S.Context.UnsignedIntTy;
2665    break;
2666  case 64:
2667    if (!IntegerMode)
2668      NewTy = S.Context.DoubleTy;
2669    else if (OldTy->isSignedIntegerType())
2670      if (S.Context.getTargetInfo().getLongWidth() == 64)
2671        NewTy = S.Context.LongTy;
2672      else
2673        NewTy = S.Context.LongLongTy;
2674    else
2675      if (S.Context.getTargetInfo().getLongWidth() == 64)
2676        NewTy = S.Context.UnsignedLongTy;
2677      else
2678        NewTy = S.Context.UnsignedLongLongTy;
2679    break;
2680  case 96:
2681    NewTy = S.Context.LongDoubleTy;
2682    break;
2683  case 128:
2684    if (!IntegerMode) {
2685      S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name;
2686      return;
2687    }
2688    if (OldTy->isSignedIntegerType())
2689      NewTy = S.Context.Int128Ty;
2690    else
2691      NewTy = S.Context.UnsignedInt128Ty;
2692    break;
2693  }
2694
2695  if (ComplexMode) {
2696    NewTy = S.Context.getComplexType(NewTy);
2697  }
2698
2699  // Install the new type.
2700  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
2701    // FIXME: preserve existing source info.
2702    TD->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(NewTy));
2703  } else
2704    cast<ValueDecl>(D)->setType(NewTy);
2705}
2706
2707static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2708  // check the attribute arguments.
2709  if (!checkAttributeNumArgs(S, Attr, 0))
2710    return;
2711
2712  if (!isFunctionOrMethod(D)) {
2713    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2714      << Attr.getName() << ExpectedFunction;
2715    return;
2716  }
2717
2718  D->addAttr(::new (S.Context) NoDebugAttr(Attr.getLoc(), S.Context));
2719}
2720
2721static void handleNoInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2722  // check the attribute arguments.
2723  if (!checkAttributeNumArgs(S, Attr, 0))
2724    return;
2725
2726
2727  if (!isa<FunctionDecl>(D)) {
2728    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2729      << Attr.getName() << ExpectedFunction;
2730    return;
2731  }
2732
2733  D->addAttr(::new (S.Context) NoInlineAttr(Attr.getLoc(), S.Context));
2734}
2735
2736static void handleNoInstrumentFunctionAttr(Sema &S, Decl *D,
2737                                           const AttributeList &Attr) {
2738  // check the attribute arguments.
2739  if (!checkAttributeNumArgs(S, Attr, 0))
2740    return;
2741
2742
2743  if (!isa<FunctionDecl>(D)) {
2744    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2745      << Attr.getName() << ExpectedFunction;
2746    return;
2747  }
2748
2749  D->addAttr(::new (S.Context) NoInstrumentFunctionAttr(Attr.getLoc(),
2750                                                        S.Context));
2751}
2752
2753static void handleConstantAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2754  if (S.LangOpts.CUDA) {
2755    // check the attribute arguments.
2756    if (Attr.hasParameterOrArguments()) {
2757      S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
2758      return;
2759    }
2760
2761    if (!isa<VarDecl>(D)) {
2762      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2763        << Attr.getName() << ExpectedVariable;
2764      return;
2765    }
2766
2767    D->addAttr(::new (S.Context) CUDAConstantAttr(Attr.getLoc(), S.Context));
2768  } else {
2769    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "constant";
2770  }
2771}
2772
2773static void handleDeviceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2774  if (S.LangOpts.CUDA) {
2775    // check the attribute arguments.
2776    if (Attr.getNumArgs() != 0) {
2777      S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
2778      return;
2779    }
2780
2781    if (!isa<FunctionDecl>(D) && !isa<VarDecl>(D)) {
2782      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2783        << Attr.getName() << ExpectedVariableOrFunction;
2784      return;
2785    }
2786
2787    D->addAttr(::new (S.Context) CUDADeviceAttr(Attr.getLoc(), S.Context));
2788  } else {
2789    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "device";
2790  }
2791}
2792
2793static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2794  if (S.LangOpts.CUDA) {
2795    // check the attribute arguments.
2796    if (!checkAttributeNumArgs(S, Attr, 0))
2797      return;
2798
2799    if (!isa<FunctionDecl>(D)) {
2800      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2801        << Attr.getName() << ExpectedFunction;
2802      return;
2803    }
2804
2805    FunctionDecl *FD = cast<FunctionDecl>(D);
2806    if (!FD->getResultType()->isVoidType()) {
2807      TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc().IgnoreParens();
2808      if (FunctionTypeLoc* FTL = dyn_cast<FunctionTypeLoc>(&TL)) {
2809        S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
2810          << FD->getType()
2811          << FixItHint::CreateReplacement(FTL->getResultLoc().getSourceRange(),
2812                                          "void");
2813      } else {
2814        S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
2815          << FD->getType();
2816      }
2817      return;
2818    }
2819
2820    D->addAttr(::new (S.Context) CUDAGlobalAttr(Attr.getLoc(), S.Context));
2821  } else {
2822    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "global";
2823  }
2824}
2825
2826static void handleHostAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2827  if (S.LangOpts.CUDA) {
2828    // check the attribute arguments.
2829    if (!checkAttributeNumArgs(S, Attr, 0))
2830      return;
2831
2832
2833    if (!isa<FunctionDecl>(D)) {
2834      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2835        << Attr.getName() << ExpectedFunction;
2836      return;
2837    }
2838
2839    D->addAttr(::new (S.Context) CUDAHostAttr(Attr.getLoc(), S.Context));
2840  } else {
2841    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "host";
2842  }
2843}
2844
2845static void handleSharedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2846  if (S.LangOpts.CUDA) {
2847    // check the attribute arguments.
2848    if (!checkAttributeNumArgs(S, Attr, 0))
2849      return;
2850
2851
2852    if (!isa<VarDecl>(D)) {
2853      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2854        << Attr.getName() << ExpectedVariable;
2855      return;
2856    }
2857
2858    D->addAttr(::new (S.Context) CUDASharedAttr(Attr.getLoc(), S.Context));
2859  } else {
2860    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "shared";
2861  }
2862}
2863
2864static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2865  // check the attribute arguments.
2866  if (!checkAttributeNumArgs(S, Attr, 0))
2867    return;
2868
2869  FunctionDecl *Fn = dyn_cast<FunctionDecl>(D);
2870  if (Fn == 0) {
2871    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2872      << Attr.getName() << ExpectedFunction;
2873    return;
2874  }
2875
2876  if (!Fn->isInlineSpecified()) {
2877    S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
2878    return;
2879  }
2880
2881  D->addAttr(::new (S.Context) GNUInlineAttr(Attr.getLoc(), S.Context));
2882}
2883
2884static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2885  if (hasDeclarator(D)) return;
2886
2887  // Diagnostic is emitted elsewhere: here we store the (valid) Attr
2888  // in the Decl node for syntactic reasoning, e.g., pretty-printing.
2889  CallingConv CC;
2890  if (S.CheckCallingConvAttr(Attr, CC))
2891    return;
2892
2893  if (!isa<ObjCMethodDecl>(D)) {
2894    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
2895      << Attr.getName() << ExpectedFunctionOrMethod;
2896    return;
2897  }
2898
2899  switch (Attr.getKind()) {
2900  case AttributeList::AT_fastcall:
2901    D->addAttr(::new (S.Context) FastCallAttr(Attr.getLoc(), S.Context));
2902    return;
2903  case AttributeList::AT_stdcall:
2904    D->addAttr(::new (S.Context) StdCallAttr(Attr.getLoc(), S.Context));
2905    return;
2906  case AttributeList::AT_thiscall:
2907    D->addAttr(::new (S.Context) ThisCallAttr(Attr.getLoc(), S.Context));
2908    return;
2909  case AttributeList::AT_cdecl:
2910    D->addAttr(::new (S.Context) CDeclAttr(Attr.getLoc(), S.Context));
2911    return;
2912  case AttributeList::AT_pascal:
2913    D->addAttr(::new (S.Context) PascalAttr(Attr.getLoc(), S.Context));
2914    return;
2915  case AttributeList::AT_pcs: {
2916    Expr *Arg = Attr.getArg(0);
2917    StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
2918    if (!Str || !Str->isAscii()) {
2919      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
2920        << "pcs" << 1;
2921      Attr.setInvalid();
2922      return;
2923    }
2924
2925    StringRef StrRef = Str->getString();
2926    PcsAttr::PCSType PCS;
2927    if (StrRef == "aapcs")
2928      PCS = PcsAttr::AAPCS;
2929    else if (StrRef == "aapcs-vfp")
2930      PCS = PcsAttr::AAPCS_VFP;
2931    else {
2932      S.Diag(Attr.getLoc(), diag::err_invalid_pcs);
2933      Attr.setInvalid();
2934      return;
2935    }
2936
2937    D->addAttr(::new (S.Context) PcsAttr(Attr.getLoc(), S.Context, PCS));
2938  }
2939  default:
2940    llvm_unreachable("unexpected attribute kind");
2941    return;
2942  }
2943}
2944
2945static void handleOpenCLKernelAttr(Sema &S, Decl *D, const AttributeList &Attr){
2946  assert(!Attr.isInvalid());
2947  D->addAttr(::new (S.Context) OpenCLKernelAttr(Attr.getLoc(), S.Context));
2948}
2949
2950bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC) {
2951  if (attr.isInvalid())
2952    return true;
2953
2954  if ((attr.getNumArgs() != 0 &&
2955      !(attr.getKind() == AttributeList::AT_pcs && attr.getNumArgs() == 1)) ||
2956      attr.getParameterName()) {
2957    Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
2958    attr.setInvalid();
2959    return true;
2960  }
2961
2962  // TODO: diagnose uses of these conventions on the wrong target. Or, better
2963  // move to TargetAttributesSema one day.
2964  switch (attr.getKind()) {
2965  case AttributeList::AT_cdecl: CC = CC_C; break;
2966  case AttributeList::AT_fastcall: CC = CC_X86FastCall; break;
2967  case AttributeList::AT_stdcall: CC = CC_X86StdCall; break;
2968  case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break;
2969  case AttributeList::AT_pascal: CC = CC_X86Pascal; break;
2970  case AttributeList::AT_pcs: {
2971    Expr *Arg = attr.getArg(0);
2972    StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
2973    if (!Str || !Str->isAscii()) {
2974      Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string)
2975        << "pcs" << 1;
2976      attr.setInvalid();
2977      return true;
2978    }
2979
2980    StringRef StrRef = Str->getString();
2981    if (StrRef == "aapcs") {
2982      CC = CC_AAPCS;
2983      break;
2984    } else if (StrRef == "aapcs-vfp") {
2985      CC = CC_AAPCS_VFP;
2986      break;
2987    }
2988    // FALLS THROUGH
2989  }
2990  default: llvm_unreachable("unexpected attribute kind"); return true;
2991  }
2992
2993  return false;
2994}
2995
2996static void handleRegparmAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2997  if (hasDeclarator(D)) return;
2998
2999  unsigned numParams;
3000  if (S.CheckRegparmAttr(Attr, numParams))
3001    return;
3002
3003  if (!isa<ObjCMethodDecl>(D)) {
3004    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3005      << Attr.getName() << ExpectedFunctionOrMethod;
3006    return;
3007  }
3008
3009  D->addAttr(::new (S.Context) RegparmAttr(Attr.getLoc(), S.Context, numParams));
3010}
3011
3012/// Checks a regparm attribute, returning true if it is ill-formed and
3013/// otherwise setting numParams to the appropriate value.
3014bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) {
3015  if (Attr.isInvalid())
3016    return true;
3017
3018  if (Attr.getNumArgs() != 1) {
3019    Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3020    Attr.setInvalid();
3021    return true;
3022  }
3023
3024  Expr *NumParamsExpr = Attr.getArg(0);
3025  llvm::APSInt NumParams(32);
3026  if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() ||
3027      !NumParamsExpr->isIntegerConstantExpr(NumParams, Context)) {
3028    Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
3029      << "regparm" << NumParamsExpr->getSourceRange();
3030    Attr.setInvalid();
3031    return true;
3032  }
3033
3034  if (Context.getTargetInfo().getRegParmMax() == 0) {
3035    Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform)
3036      << NumParamsExpr->getSourceRange();
3037    Attr.setInvalid();
3038    return true;
3039  }
3040
3041  numParams = NumParams.getZExtValue();
3042  if (numParams > Context.getTargetInfo().getRegParmMax()) {
3043    Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number)
3044      << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange();
3045    Attr.setInvalid();
3046    return true;
3047  }
3048
3049  return false;
3050}
3051
3052static void handleLaunchBoundsAttr(Sema &S, Decl *D, const AttributeList &Attr){
3053  if (S.LangOpts.CUDA) {
3054    // check the attribute arguments.
3055    if (Attr.getNumArgs() != 1 && Attr.getNumArgs() != 2) {
3056      // FIXME: 0 is not okay.
3057      S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 2;
3058      return;
3059    }
3060
3061    if (!isFunctionOrMethod(D)) {
3062      S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
3063        << Attr.getName() << ExpectedFunctionOrMethod;
3064      return;
3065    }
3066
3067    Expr *MaxThreadsExpr = Attr.getArg(0);
3068    llvm::APSInt MaxThreads(32);
3069    if (MaxThreadsExpr->isTypeDependent() ||
3070        MaxThreadsExpr->isValueDependent() ||
3071        !MaxThreadsExpr->isIntegerConstantExpr(MaxThreads, S.Context)) {
3072      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
3073        << "launch_bounds" << 1 << MaxThreadsExpr->getSourceRange();
3074      return;
3075    }
3076
3077    llvm::APSInt MinBlocks(32);
3078    if (Attr.getNumArgs() > 1) {
3079      Expr *MinBlocksExpr = Attr.getArg(1);
3080      if (MinBlocksExpr->isTypeDependent() ||
3081          MinBlocksExpr->isValueDependent() ||
3082          !MinBlocksExpr->isIntegerConstantExpr(MinBlocks, S.Context)) {
3083        S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int)
3084          << "launch_bounds" << 2 << MinBlocksExpr->getSourceRange();
3085        return;
3086      }
3087    }
3088
3089    D->addAttr(::new (S.Context) CUDALaunchBoundsAttr(Attr.getLoc(), S.Context,
3090                                                      MaxThreads.getZExtValue(),
3091                                                     MinBlocks.getZExtValue()));
3092  } else {
3093    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "launch_bounds";
3094  }
3095}
3096
3097//===----------------------------------------------------------------------===//
3098// Checker-specific attribute handlers.
3099//===----------------------------------------------------------------------===//
3100
3101static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) {
3102  return type->isObjCObjectPointerType() || S.Context.isObjCNSObjectType(type);
3103}
3104static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) {
3105  return type->isPointerType() || isValidSubjectOfNSAttribute(S, type);
3106}
3107
3108static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3109  ParmVarDecl *param = dyn_cast<ParmVarDecl>(D);
3110  if (!param) {
3111    S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
3112      << SourceRange(Attr.getLoc()) << Attr.getName() << ExpectedParameter;
3113    return;
3114  }
3115
3116  bool typeOK, cf;
3117  if (Attr.getKind() == AttributeList::AT_ns_consumed) {
3118    typeOK = isValidSubjectOfNSAttribute(S, param->getType());
3119    cf = false;
3120  } else {
3121    typeOK = isValidSubjectOfCFAttribute(S, param->getType());
3122    cf = true;
3123  }
3124
3125  if (!typeOK) {
3126    S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
3127      << SourceRange(Attr.getLoc()) << Attr.getName() << cf;
3128    return;
3129  }
3130
3131  if (cf)
3132    param->addAttr(::new (S.Context) CFConsumedAttr(Attr.getLoc(), S.Context));
3133  else
3134    param->addAttr(::new (S.Context) NSConsumedAttr(Attr.getLoc(), S.Context));
3135}
3136
3137static void handleNSConsumesSelfAttr(Sema &S, Decl *D,
3138                                     const AttributeList &Attr) {
3139  if (!isa<ObjCMethodDecl>(D)) {
3140    S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
3141      << SourceRange(Attr.getLoc()) << Attr.getName() << ExpectedMethod;
3142    return;
3143  }
3144
3145  D->addAttr(::new (S.Context) NSConsumesSelfAttr(Attr.getLoc(), S.Context));
3146}
3147
3148static void handleNSReturnsRetainedAttr(Sema &S, Decl *D,
3149                                        const AttributeList &Attr) {
3150
3151  QualType returnType;
3152
3153  if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
3154    returnType = MD->getResultType();
3155  else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
3156    returnType = PD->getType();
3157  else if (S.getLangOptions().ObjCAutoRefCount && hasDeclarator(D) &&
3158           (Attr.getKind() == AttributeList::AT_ns_returns_retained))
3159    return; // ignore: was handled as a type attribute
3160  else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
3161    returnType = FD->getResultType();
3162  else {
3163    S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
3164        << SourceRange(Attr.getLoc()) << Attr.getName()
3165        << ExpectedFunctionOrMethod;
3166    return;
3167  }
3168
3169  bool typeOK;
3170  bool cf;
3171  switch (Attr.getKind()) {
3172  default: llvm_unreachable("invalid ownership attribute"); return;
3173  case AttributeList::AT_ns_returns_autoreleased:
3174  case AttributeList::AT_ns_returns_retained:
3175  case AttributeList::AT_ns_returns_not_retained:
3176    typeOK = isValidSubjectOfNSAttribute(S, returnType);
3177    cf = false;
3178    break;
3179
3180  case AttributeList::AT_cf_returns_retained:
3181  case AttributeList::AT_cf_returns_not_retained:
3182    typeOK = isValidSubjectOfCFAttribute(S, returnType);
3183    cf = true;
3184    break;
3185  }
3186
3187  if (!typeOK) {
3188    S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3189      << SourceRange(Attr.getLoc())
3190      << Attr.getName() << isa<ObjCMethodDecl>(D) << cf;
3191    return;
3192  }
3193
3194  switch (Attr.getKind()) {
3195    default:
3196      assert(0 && "invalid ownership attribute");
3197      return;
3198    case AttributeList::AT_ns_returns_autoreleased:
3199      D->addAttr(::new (S.Context) NSReturnsAutoreleasedAttr(Attr.getLoc(),
3200                                                             S.Context));
3201      return;
3202    case AttributeList::AT_cf_returns_not_retained:
3203      D->addAttr(::new (S.Context) CFReturnsNotRetainedAttr(Attr.getLoc(),
3204                                                            S.Context));
3205      return;
3206    case AttributeList::AT_ns_returns_not_retained:
3207      D->addAttr(::new (S.Context) NSReturnsNotRetainedAttr(Attr.getLoc(),
3208                                                            S.Context));
3209      return;
3210    case AttributeList::AT_cf_returns_retained:
3211      D->addAttr(::new (S.Context) CFReturnsRetainedAttr(Attr.getLoc(),
3212                                                         S.Context));
3213      return;
3214    case AttributeList::AT_ns_returns_retained:
3215      D->addAttr(::new (S.Context) NSReturnsRetainedAttr(Attr.getLoc(),
3216                                                         S.Context));
3217      return;
3218  };
3219}
3220
3221static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D,
3222                                              const AttributeList &attr) {
3223  SourceLocation loc = attr.getLoc();
3224
3225  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(D);
3226
3227  if (!isa<ObjCMethodDecl>(method)) {
3228    S.Diag(method->getLocStart(), diag::err_attribute_wrong_decl_type)
3229      << SourceRange(loc, loc) << attr.getName() << 13 /* methods */;
3230    return;
3231  }
3232
3233  // Check that the method returns a normal pointer.
3234  QualType resultType = method->getResultType();
3235  if (!resultType->isPointerType() || resultType->isObjCRetainableType()) {
3236    S.Diag(method->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
3237      << SourceRange(loc)
3238      << attr.getName() << /*method*/ 1 << /*non-retainable pointer*/ 2;
3239
3240    // Drop the attribute.
3241    return;
3242  }
3243
3244  method->addAttr(
3245    ::new (S.Context) ObjCReturnsInnerPointerAttr(loc, S.Context));
3246}
3247
3248static void handleObjCOwnershipAttr(Sema &S, Decl *D,
3249                                    const AttributeList &Attr) {
3250  if (hasDeclarator(D)) return;
3251
3252  SourceLocation L = Attr.getLoc();
3253  S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
3254    << SourceRange(L, L) << Attr.getName() << 12 /* variable */;
3255}
3256
3257static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
3258                                          const AttributeList &Attr) {
3259  if (!isa<VarDecl>(D) && !isa<FieldDecl>(D)) {
3260    SourceLocation L = Attr.getLoc();
3261    S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
3262      << SourceRange(L, L) << Attr.getName() << 12 /* variable */;
3263    return;
3264  }
3265
3266  ValueDecl *vd = cast<ValueDecl>(D);
3267  QualType type = vd->getType();
3268
3269  if (!type->isDependentType() &&
3270      !type->isObjCLifetimeType()) {
3271    S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type)
3272      << type;
3273    return;
3274  }
3275
3276  Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
3277
3278  // If we have no lifetime yet, check the lifetime we're presumably
3279  // going to infer.
3280  if (lifetime == Qualifiers::OCL_None && !type->isDependentType())
3281    lifetime = type->getObjCARCImplicitLifetime();
3282
3283  switch (lifetime) {
3284  case Qualifiers::OCL_None:
3285    assert(type->isDependentType() &&
3286           "didn't infer lifetime for non-dependent type?");
3287    break;
3288
3289  case Qualifiers::OCL_Weak:   // meaningful
3290  case Qualifiers::OCL_Strong: // meaningful
3291    break;
3292
3293  case Qualifiers::OCL_ExplicitNone:
3294  case Qualifiers::OCL_Autoreleasing:
3295    S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
3296      << (lifetime == Qualifiers::OCL_Autoreleasing);
3297    break;
3298  }
3299
3300  D->addAttr(::new (S.Context)
3301                 ObjCPreciseLifetimeAttr(Attr.getLoc(), S.Context));
3302}
3303
3304static bool isKnownDeclSpecAttr(const AttributeList &Attr) {
3305  return Attr.getKind() == AttributeList::AT_dllimport ||
3306         Attr.getKind() == AttributeList::AT_dllexport ||
3307         Attr.getKind() == AttributeList::AT_uuid;
3308}
3309
3310//===----------------------------------------------------------------------===//
3311// Microsoft specific attribute handlers.
3312//===----------------------------------------------------------------------===//
3313
3314static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
3315  if (S.LangOpts.Microsoft || S.LangOpts.Borland) {
3316    // check the attribute arguments.
3317    if (!checkAttributeNumArgs(S, Attr, 1))
3318      return;
3319
3320    Expr *Arg = Attr.getArg(0);
3321    StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
3322    if (!Str || !Str->isAscii()) {
3323      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
3324        << "uuid" << 1;
3325      return;
3326    }
3327
3328    StringRef StrRef = Str->getString();
3329
3330    bool IsCurly = StrRef.size() > 1 && StrRef.front() == '{' &&
3331                   StrRef.back() == '}';
3332
3333    // Validate GUID length.
3334    if (IsCurly && StrRef.size() != 38) {
3335      S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
3336      return;
3337    }
3338    if (!IsCurly && StrRef.size() != 36) {
3339      S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
3340      return;
3341    }
3342
3343    // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
3344    // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
3345    StringRef::iterator I = StrRef.begin();
3346    if (IsCurly) // Skip the optional '{'
3347       ++I;
3348
3349    for (int i = 0; i < 36; ++i) {
3350      if (i == 8 || i == 13 || i == 18 || i == 23) {
3351        if (*I != '-') {
3352          S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
3353          return;
3354        }
3355      } else if (!isxdigit(*I)) {
3356        S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
3357        return;
3358      }
3359      I++;
3360    }
3361
3362    D->addAttr(::new (S.Context) UuidAttr(Attr.getLoc(), S.Context,
3363                                          Str->getString()));
3364  } else
3365    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "uuid";
3366}
3367
3368//===----------------------------------------------------------------------===//
3369// Top Level Sema Entry Points
3370//===----------------------------------------------------------------------===//
3371
3372static void ProcessNonInheritableDeclAttr(Sema &S, Scope *scope, Decl *D,
3373                                          const AttributeList &Attr) {
3374  switch (Attr.getKind()) {
3375  case AttributeList::AT_device:      handleDeviceAttr      (S, D, Attr); break;
3376  case AttributeList::AT_host:        handleHostAttr        (S, D, Attr); break;
3377  case AttributeList::AT_overloadable:handleOverloadableAttr(S, D, Attr); break;
3378  default:
3379    break;
3380  }
3381}
3382
3383static void ProcessInheritableDeclAttr(Sema &S, Scope *scope, Decl *D,
3384                                       const AttributeList &Attr) {
3385  switch (Attr.getKind()) {
3386  case AttributeList::AT_IBAction:            handleIBAction(S, D, Attr); break;
3387    case AttributeList::AT_IBOutlet:          handleIBOutlet(S, D, Attr); break;
3388  case AttributeList::AT_IBOutletCollection:
3389      handleIBOutletCollection(S, D, Attr); break;
3390  case AttributeList::AT_address_space:
3391  case AttributeList::AT_opencl_image_access:
3392  case AttributeList::AT_objc_gc:
3393  case AttributeList::AT_vector_size:
3394  case AttributeList::AT_neon_vector_type:
3395  case AttributeList::AT_neon_polyvector_type:
3396    // Ignore these, these are type attributes, handled by
3397    // ProcessTypeAttributes.
3398    break;
3399  case AttributeList::AT_device:
3400  case AttributeList::AT_host:
3401  case AttributeList::AT_overloadable:
3402    // Ignore, this is a non-inheritable attribute, handled
3403    // by ProcessNonInheritableDeclAttr.
3404    break;
3405  case AttributeList::AT_alias:       handleAliasAttr       (S, D, Attr); break;
3406  case AttributeList::AT_aligned:     handleAlignedAttr     (S, D, Attr); break;
3407  case AttributeList::AT_always_inline:
3408    handleAlwaysInlineAttr  (S, D, Attr); break;
3409  case AttributeList::AT_analyzer_noreturn:
3410    handleAnalyzerNoReturnAttr  (S, D, Attr); break;
3411  case AttributeList::AT_annotate:    handleAnnotateAttr    (S, D, Attr); break;
3412  case AttributeList::AT_availability:handleAvailabilityAttr(S, D, Attr); break;
3413  case AttributeList::AT_carries_dependency:
3414                                      handleDependencyAttr  (S, D, Attr); break;
3415  case AttributeList::AT_common:      handleCommonAttr      (S, D, Attr); break;
3416  case AttributeList::AT_constant:    handleConstantAttr    (S, D, Attr); break;
3417  case AttributeList::AT_constructor: handleConstructorAttr (S, D, Attr); break;
3418  case AttributeList::AT_deprecated:  handleDeprecatedAttr  (S, D, Attr); break;
3419  case AttributeList::AT_destructor:  handleDestructorAttr  (S, D, Attr); break;
3420  case AttributeList::AT_ext_vector_type:
3421    handleExtVectorTypeAttr(S, scope, D, Attr);
3422    break;
3423  case AttributeList::AT_format:      handleFormatAttr      (S, D, Attr); break;
3424  case AttributeList::AT_format_arg:  handleFormatArgAttr   (S, D, Attr); break;
3425  case AttributeList::AT_global:      handleGlobalAttr      (S, D, Attr); break;
3426  case AttributeList::AT_gnu_inline:  handleGNUInlineAttr   (S, D, Attr); break;
3427  case AttributeList::AT_launch_bounds:
3428    handleLaunchBoundsAttr(S, D, Attr);
3429    break;
3430  case AttributeList::AT_mode:        handleModeAttr        (S, D, Attr); break;
3431  case AttributeList::AT_malloc:      handleMallocAttr      (S, D, Attr); break;
3432  case AttributeList::AT_may_alias:   handleMayAliasAttr    (S, D, Attr); break;
3433  case AttributeList::AT_nocommon:    handleNoCommonAttr    (S, D, Attr); break;
3434  case AttributeList::AT_nonnull:     handleNonNullAttr     (S, D, Attr); break;
3435  case AttributeList::AT_ownership_returns:
3436  case AttributeList::AT_ownership_takes:
3437  case AttributeList::AT_ownership_holds:
3438      handleOwnershipAttr     (S, D, Attr); break;
3439  case AttributeList::AT_naked:       handleNakedAttr       (S, D, Attr); break;
3440  case AttributeList::AT_noreturn:    handleNoReturnAttr    (S, D, Attr); break;
3441  case AttributeList::AT_nothrow:     handleNothrowAttr     (S, D, Attr); break;
3442  case AttributeList::AT_shared:      handleSharedAttr      (S, D, Attr); break;
3443  case AttributeList::AT_vecreturn:   handleVecReturnAttr   (S, D, Attr); break;
3444
3445  case AttributeList::AT_objc_ownership:
3446    handleObjCOwnershipAttr(S, D, Attr); break;
3447  case AttributeList::AT_objc_precise_lifetime:
3448    handleObjCPreciseLifetimeAttr(S, D, Attr); break;
3449
3450  case AttributeList::AT_objc_returns_inner_pointer:
3451    handleObjCReturnsInnerPointerAttr(S, D, Attr); break;
3452
3453  // Checker-specific.
3454  case AttributeList::AT_cf_consumed:
3455  case AttributeList::AT_ns_consumed: handleNSConsumedAttr  (S, D, Attr); break;
3456  case AttributeList::AT_ns_consumes_self:
3457    handleNSConsumesSelfAttr(S, D, Attr); break;
3458
3459  case AttributeList::AT_ns_returns_autoreleased:
3460  case AttributeList::AT_ns_returns_not_retained:
3461  case AttributeList::AT_cf_returns_not_retained:
3462  case AttributeList::AT_ns_returns_retained:
3463  case AttributeList::AT_cf_returns_retained:
3464    handleNSReturnsRetainedAttr(S, D, Attr); break;
3465
3466  case AttributeList::AT_reqd_wg_size:
3467    handleReqdWorkGroupSize(S, D, Attr); break;
3468
3469  case AttributeList::AT_init_priority:
3470      handleInitPriorityAttr(S, D, Attr); break;
3471
3472  case AttributeList::AT_packed:      handlePackedAttr      (S, D, Attr); break;
3473  case AttributeList::AT_MsStruct:    handleMsStructAttr    (S, D, Attr); break;
3474  case AttributeList::AT_section:     handleSectionAttr     (S, D, Attr); break;
3475  case AttributeList::AT_unavailable: handleUnavailableAttr (S, D, Attr); break;
3476  case AttributeList::AT_arc_weakref_unavailable:
3477    handleArcWeakrefUnavailableAttr (S, D, Attr);
3478    break;
3479  case AttributeList::AT_unused:      handleUnusedAttr      (S, D, Attr); break;
3480  case AttributeList::AT_used:        handleUsedAttr        (S, D, Attr); break;
3481  case AttributeList::AT_visibility:  handleVisibilityAttr  (S, D, Attr); break;
3482  case AttributeList::AT_warn_unused_result: handleWarnUnusedResult(S, D, Attr);
3483    break;
3484  case AttributeList::AT_weak:        handleWeakAttr        (S, D, Attr); break;
3485  case AttributeList::AT_weakref:     handleWeakRefAttr     (S, D, Attr); break;
3486  case AttributeList::AT_weak_import: handleWeakImportAttr  (S, D, Attr); break;
3487  case AttributeList::AT_transparent_union:
3488    handleTransparentUnionAttr(S, D, Attr);
3489    break;
3490  case AttributeList::AT_objc_exception:
3491    handleObjCExceptionAttr(S, D, Attr);
3492    break;
3493  case AttributeList::AT_objc_method_family:
3494    handleObjCMethodFamilyAttr(S, D, Attr);
3495    break;
3496  case AttributeList::AT_nsobject:    handleObjCNSObject    (S, D, Attr); break;
3497  case AttributeList::AT_blocks:      handleBlocksAttr      (S, D, Attr); break;
3498  case AttributeList::AT_sentinel:    handleSentinelAttr    (S, D, Attr); break;
3499  case AttributeList::AT_const:       handleConstAttr       (S, D, Attr); break;
3500  case AttributeList::AT_pure:        handlePureAttr        (S, D, Attr); break;
3501  case AttributeList::AT_cleanup:     handleCleanupAttr     (S, D, Attr); break;
3502  case AttributeList::AT_nodebug:     handleNoDebugAttr     (S, D, Attr); break;
3503  case AttributeList::AT_noinline:    handleNoInlineAttr    (S, D, Attr); break;
3504  case AttributeList::AT_regparm:     handleRegparmAttr     (S, D, Attr); break;
3505  case AttributeList::IgnoredAttribute:
3506    // Just ignore
3507    break;
3508  case AttributeList::AT_no_instrument_function:  // Interacts with -pg.
3509    handleNoInstrumentFunctionAttr(S, D, Attr);
3510    break;
3511  case AttributeList::AT_stdcall:
3512  case AttributeList::AT_cdecl:
3513  case AttributeList::AT_fastcall:
3514  case AttributeList::AT_thiscall:
3515  case AttributeList::AT_pascal:
3516  case AttributeList::AT_pcs:
3517    handleCallConvAttr(S, D, Attr);
3518    break;
3519  case AttributeList::AT_opencl_kernel_function:
3520    handleOpenCLKernelAttr(S, D, Attr);
3521    break;
3522  case AttributeList::AT_uuid:
3523    handleUuidAttr(S, D, Attr);
3524    break;
3525
3526  // Thread safety attributes:
3527  case AttributeList::AT_guarded_var:
3528    handleGuardedVarAttr(S, D, Attr);
3529    break;
3530  case AttributeList::AT_pt_guarded_var:
3531    handleGuardedVarAttr(S, D, Attr, /*pointer = */true);
3532    break;
3533  case AttributeList::AT_scoped_lockable:
3534    handleLockableAttr(S, D, Attr, /*scoped = */true);
3535    break;
3536  case AttributeList::AT_no_thread_safety_analysis:
3537    handleNoThreadSafetyAttr(S, D, Attr);
3538    break;
3539  case AttributeList::AT_lockable:
3540    handleLockableAttr(S, D, Attr);
3541    break;
3542  case AttributeList::AT_guarded_by:
3543    handleGuardedByAttr(S, D, Attr);
3544    break;
3545  case AttributeList::AT_pt_guarded_by:
3546    handleGuardedByAttr(S, D, Attr, /*pointer = */true);
3547    break;
3548  case AttributeList::AT_exclusive_lock_function:
3549    handleLockFunAttr(S, D, Attr, /*exclusive = */true);
3550    break;
3551  case AttributeList::AT_exclusive_locks_required:
3552    handleLocksRequiredAttr(S, D, Attr, /*exclusive = */true);
3553    break;
3554  case AttributeList::AT_exclusive_trylock_function:
3555    handleTrylockFunAttr(S, D, Attr, /*exclusive = */true);
3556    break;
3557  case AttributeList::AT_lock_returned:
3558    handleLockReturnedAttr(S, D, Attr);
3559    break;
3560  case AttributeList::AT_locks_excluded:
3561    handleLocksExcludedAttr(S, D, Attr);
3562    break;
3563  case AttributeList::AT_shared_lock_function:
3564    handleLockFunAttr(S, D, Attr);
3565    break;
3566  case AttributeList::AT_shared_locks_required:
3567    handleLocksRequiredAttr(S, D, Attr);
3568    break;
3569  case AttributeList::AT_shared_trylock_function:
3570    handleTrylockFunAttr(S, D, Attr);
3571    break;
3572  case AttributeList::AT_unlock_function:
3573    handleUnlockFunAttr(S, D, Attr);
3574    break;
3575  case AttributeList::AT_acquired_before:
3576    handleAcquireOrderAttr(S, D, Attr, /*before = */true);
3577    break;
3578  case AttributeList::AT_acquired_after:
3579    handleAcquireOrderAttr(S, D, Attr, /*before = */false);
3580    break;
3581
3582  default:
3583    // Ask target about the attribute.
3584    const TargetAttributesSema &TargetAttrs = S.getTargetAttributesSema();
3585    if (!TargetAttrs.ProcessDeclAttribute(scope, D, Attr, S))
3586      S.Diag(Attr.getLoc(), diag::warn_unknown_attribute_ignored)
3587        << Attr.getName();
3588    break;
3589  }
3590}
3591
3592/// ProcessDeclAttribute - Apply the specific attribute to the specified decl if
3593/// the attribute applies to decls.  If the attribute is a type attribute, just
3594/// silently ignore it if a GNU attribute. FIXME: Applying a C++0x attribute to
3595/// the wrong thing is illegal (C++0x [dcl.attr.grammar]/4).
3596static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
3597                                 const AttributeList &Attr,
3598                                 bool NonInheritable, bool Inheritable) {
3599  if (Attr.isInvalid())
3600    return;
3601
3602  if (Attr.isDeclspecAttribute() && !isKnownDeclSpecAttr(Attr))
3603    // FIXME: Try to deal with other __declspec attributes!
3604    return;
3605
3606  if (NonInheritable)
3607    ProcessNonInheritableDeclAttr(S, scope, D, Attr);
3608
3609  if (Inheritable)
3610    ProcessInheritableDeclAttr(S, scope, D, Attr);
3611}
3612
3613/// ProcessDeclAttributeList - Apply all the decl attributes in the specified
3614/// attribute list to the specified decl, ignoring any type attributes.
3615void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
3616                                    const AttributeList *AttrList,
3617                                    bool NonInheritable, bool Inheritable) {
3618  for (const AttributeList* l = AttrList; l; l = l->getNext()) {
3619    ProcessDeclAttribute(*this, S, D, *l, NonInheritable, Inheritable);
3620  }
3621
3622  // GCC accepts
3623  // static int a9 __attribute__((weakref));
3624  // but that looks really pointless. We reject it.
3625  if (Inheritable && D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) {
3626    Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias) <<
3627    dyn_cast<NamedDecl>(D)->getNameAsString();
3628    return;
3629  }
3630}
3631
3632/// DeclClonePragmaWeak - clone existing decl (maybe definition),
3633/// #pragma weak needs a non-definition decl and source may not have one
3634NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II) {
3635  assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND));
3636  NamedDecl *NewD = 0;
3637  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
3638    NewD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
3639                                FD->getInnerLocStart(),
3640                                FD->getLocation(), DeclarationName(II),
3641                                FD->getType(), FD->getTypeSourceInfo());
3642    if (FD->getQualifier()) {
3643      FunctionDecl *NewFD = cast<FunctionDecl>(NewD);
3644      NewFD->setQualifierInfo(FD->getQualifierLoc());
3645    }
3646  } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
3647    NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
3648                           VD->getInnerLocStart(), VD->getLocation(), II,
3649                           VD->getType(), VD->getTypeSourceInfo(),
3650                           VD->getStorageClass(),
3651                           VD->getStorageClassAsWritten());
3652    if (VD->getQualifier()) {
3653      VarDecl *NewVD = cast<VarDecl>(NewD);
3654      NewVD->setQualifierInfo(VD->getQualifierLoc());
3655    }
3656  }
3657  return NewD;
3658}
3659
3660/// DeclApplyPragmaWeak - A declaration (maybe definition) needs #pragma weak
3661/// applied to it, possibly with an alias.
3662void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
3663  if (W.getUsed()) return; // only do this once
3664  W.setUsed(true);
3665  if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
3666    IdentifierInfo *NDId = ND->getIdentifier();
3667    NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias());
3668    NewD->addAttr(::new (Context) AliasAttr(W.getLocation(), Context,
3669                                            NDId->getName()));
3670    NewD->addAttr(::new (Context) WeakAttr(W.getLocation(), Context));
3671    WeakTopLevelDecl.push_back(NewD);
3672    // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
3673    // to insert Decl at TU scope, sorry.
3674    DeclContext *SavedContext = CurContext;
3675    CurContext = Context.getTranslationUnitDecl();
3676    PushOnScopeChains(NewD, S);
3677    CurContext = SavedContext;
3678  } else { // just add weak to existing
3679    ND->addAttr(::new (Context) WeakAttr(W.getLocation(), Context));
3680  }
3681}
3682
3683/// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in
3684/// it, apply them to D.  This is a bit tricky because PD can have attributes
3685/// specified in many different places, and we need to find and apply them all.
3686void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD,
3687                                 bool NonInheritable, bool Inheritable) {
3688  // It's valid to "forward-declare" #pragma weak, in which case we
3689  // have to do this.
3690  if (Inheritable) {
3691    LoadExternalWeakUndeclaredIdentifiers();
3692    if (!WeakUndeclaredIdentifiers.empty()) {
3693      if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
3694        if (IdentifierInfo *Id = ND->getIdentifier()) {
3695          llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator I
3696            = WeakUndeclaredIdentifiers.find(Id);
3697          if (I != WeakUndeclaredIdentifiers.end() && ND->hasLinkage()) {
3698            WeakInfo W = I->second;
3699            DeclApplyPragmaWeak(S, ND, W);
3700            WeakUndeclaredIdentifiers[Id] = W;
3701          }
3702        }
3703      }
3704    }
3705  }
3706
3707  // Apply decl attributes from the DeclSpec if present.
3708  if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList())
3709    ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable);
3710
3711  // Walk the declarator structure, applying decl attributes that were in a type
3712  // position to the decl itself.  This handles cases like:
3713  //   int *__attr__(x)** D;
3714  // when X is a decl attribute.
3715  for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i)
3716    if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs())
3717      ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable);
3718
3719  // Finally, apply any attributes on the decl itself.
3720  if (const AttributeList *Attrs = PD.getAttributes())
3721    ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable);
3722}
3723
3724/// Is the given declaration allowed to use a forbidden type?
3725static bool isForbiddenTypeAllowed(Sema &S, Decl *decl) {
3726  // Private ivars are always okay.  Unfortunately, people don't
3727  // always properly make their ivars private, even in system headers.
3728  // Plus we need to make fields okay, too.
3729  if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl))
3730    return false;
3731
3732  // Require it to be declared in a system header.
3733  return S.Context.getSourceManager().isInSystemHeader(decl->getLocation());
3734}
3735
3736/// Handle a delayed forbidden-type diagnostic.
3737static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag,
3738                                       Decl *decl) {
3739  if (decl && isForbiddenTypeAllowed(S, decl)) {
3740    decl->addAttr(new (S.Context) UnavailableAttr(diag.Loc, S.Context,
3741                        "this system declaration uses an unsupported type"));
3742    return;
3743  }
3744
3745  S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())
3746    << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument();
3747  diag.Triggered = true;
3748}
3749
3750// This duplicates a vector push_back but hides the need to know the
3751// size of the type.
3752void Sema::DelayedDiagnostics::add(const DelayedDiagnostic &diag) {
3753  assert(StackSize <= StackCapacity);
3754
3755  // Grow the stack if necessary.
3756  if (StackSize == StackCapacity) {
3757    unsigned newCapacity = 2 * StackCapacity + 2;
3758    char *newBuffer = new char[newCapacity * sizeof(DelayedDiagnostic)];
3759    const char *oldBuffer = (const char*) Stack;
3760
3761    if (StackCapacity)
3762      memcpy(newBuffer, oldBuffer, StackCapacity * sizeof(DelayedDiagnostic));
3763
3764    delete[] oldBuffer;
3765    Stack = reinterpret_cast<sema::DelayedDiagnostic*>(newBuffer);
3766    StackCapacity = newCapacity;
3767  }
3768
3769  assert(StackSize < StackCapacity);
3770  new (&Stack[StackSize++]) DelayedDiagnostic(diag);
3771}
3772
3773void Sema::DelayedDiagnostics::popParsingDecl(Sema &S, ParsingDeclState state,
3774                                              Decl *decl) {
3775  DelayedDiagnostics &DD = S.DelayedDiagnostics;
3776
3777  // Check the invariants.
3778  assert(DD.StackSize >= state.SavedStackSize);
3779  assert(state.SavedStackSize >= DD.ActiveStackBase);
3780  assert(DD.ParsingDepth > 0);
3781
3782  // Drop the parsing depth.
3783  DD.ParsingDepth--;
3784
3785  // If there are no active diagnostics, we're done.
3786  if (DD.StackSize == DD.ActiveStackBase)
3787    return;
3788
3789  // We only want to actually emit delayed diagnostics when we
3790  // successfully parsed a decl.
3791  if (decl && !decl->isInvalidDecl()) {
3792    // We emit all the active diagnostics, not just those starting
3793    // from the saved state.  The idea is this:  we get one push for a
3794    // decl spec and another for each declarator;  in a decl group like:
3795    //   deprecated_typedef foo, *bar, baz();
3796    // only the declarator pops will be passed decls.  This is correct;
3797    // we really do need to consider delayed diagnostics from the decl spec
3798    // for each of the different declarations.
3799    for (unsigned i = DD.ActiveStackBase, e = DD.StackSize; i != e; ++i) {
3800      DelayedDiagnostic &diag = DD.Stack[i];
3801      if (diag.Triggered)
3802        continue;
3803
3804      switch (diag.Kind) {
3805      case DelayedDiagnostic::Deprecation:
3806        S.HandleDelayedDeprecationCheck(diag, decl);
3807        break;
3808
3809      case DelayedDiagnostic::Access:
3810        S.HandleDelayedAccessCheck(diag, decl);
3811        break;
3812
3813      case DelayedDiagnostic::ForbiddenType:
3814        handleDelayedForbiddenType(S, diag, decl);
3815        break;
3816      }
3817    }
3818  }
3819
3820  // Destroy all the delayed diagnostics we're about to pop off.
3821  for (unsigned i = state.SavedStackSize, e = DD.StackSize; i != e; ++i)
3822    DD.Stack[i].Destroy();
3823
3824  DD.StackSize = state.SavedStackSize;
3825}
3826
3827static bool isDeclDeprecated(Decl *D) {
3828  do {
3829    if (D->isDeprecated())
3830      return true;
3831  } while ((D = cast_or_null<Decl>(D->getDeclContext())));
3832  return false;
3833}
3834
3835void Sema::HandleDelayedDeprecationCheck(DelayedDiagnostic &DD,
3836                                         Decl *Ctx) {
3837  if (isDeclDeprecated(Ctx))
3838    return;
3839
3840  DD.Triggered = true;
3841  if (!DD.getDeprecationMessage().empty())
3842    Diag(DD.Loc, diag::warn_deprecated_message)
3843      << DD.getDeprecationDecl()->getDeclName()
3844      << DD.getDeprecationMessage();
3845  else
3846    Diag(DD.Loc, diag::warn_deprecated)
3847      << DD.getDeprecationDecl()->getDeclName();
3848}
3849
3850void Sema::EmitDeprecationWarning(NamedDecl *D, StringRef Message,
3851                                  SourceLocation Loc,
3852                                  const ObjCInterfaceDecl *UnknownObjCClass) {
3853  // Delay if we're currently parsing a declaration.
3854  if (DelayedDiagnostics.shouldDelayDiagnostics()) {
3855    DelayedDiagnostics.add(DelayedDiagnostic::makeDeprecation(Loc, D, Message));
3856    return;
3857  }
3858
3859  // Otherwise, don't warn if our current context is deprecated.
3860  if (isDeclDeprecated(cast<Decl>(CurContext)))
3861    return;
3862  if (!Message.empty())
3863    Diag(Loc, diag::warn_deprecated_message) << D->getDeclName()
3864                                             << Message;
3865  else {
3866    if (!UnknownObjCClass)
3867      Diag(Loc, diag::warn_deprecated) << D->getDeclName();
3868    else {
3869      Diag(Loc, diag::warn_deprecated_fwdclass_message) << D->getDeclName();
3870      Diag(UnknownObjCClass->getLocation(), diag::note_forward_class);
3871    }
3872  }
3873}
3874