ParseObjc.cpp revision 891dca671a80c865c6def7259f170ba785e4faaa 
1//===--- ParseObjC.cpp - Objective C Parsing ------------------------------===//
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 the Objective-C portions of the Parser interface.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Parse/Parser.h"
15#include "clang/Parse/DeclSpec.h"
16#include "clang/Parse/Scope.h"
17#include "AstGuard.h"
18#include "clang/Basic/Diagnostic.h"
19#include "llvm/ADT/SmallVector.h"
20using namespace clang;
21
22
23/// ParseObjCAtDirectives - Handle parts of the external-declaration production:
24///       external-declaration: [C99 6.9]
25/// [OBJC]  objc-class-definition
26/// [OBJC]  objc-class-declaration
27/// [OBJC]  objc-alias-declaration
28/// [OBJC]  objc-protocol-definition
29/// [OBJC]  objc-method-definition
30/// [OBJC]  '@' 'end'
31Parser::DeclTy *Parser::ParseObjCAtDirectives() {
32  SourceLocation AtLoc = ConsumeToken(); // the "@"
33
34  switch (Tok.getObjCKeywordID()) {
35  case tok::objc_class:
36    return ParseObjCAtClassDeclaration(AtLoc);
37  case tok::objc_interface:
38    return ParseObjCAtInterfaceDeclaration(AtLoc);
39  case tok::objc_protocol:
40    return ParseObjCAtProtocolDeclaration(AtLoc);
41  case tok::objc_implementation:
42    return ParseObjCAtImplementationDeclaration(AtLoc);
43  case tok::objc_end:
44    return ParseObjCAtEndDeclaration(AtLoc);
45  case tok::objc_compatibility_alias:
46    return ParseObjCAtAliasDeclaration(AtLoc);
47  case tok::objc_synthesize:
48    return ParseObjCPropertySynthesize(AtLoc);
49  case tok::objc_dynamic:
50    return ParseObjCPropertyDynamic(AtLoc);
51  default:
52    Diag(AtLoc, diag::err_unexpected_at);
53    SkipUntil(tok::semi);
54    return 0;
55  }
56}
57
58///
59/// objc-class-declaration:
60///    '@' 'class' identifier-list ';'
61///
62Parser::DeclTy *Parser::ParseObjCAtClassDeclaration(SourceLocation atLoc) {
63  ConsumeToken(); // the identifier "class"
64  llvm::SmallVector<IdentifierInfo *, 8> ClassNames;
65
66  while (1) {
67    if (Tok.isNot(tok::identifier)) {
68      Diag(Tok, diag::err_expected_ident);
69      SkipUntil(tok::semi);
70      return 0;
71    }
72    ClassNames.push_back(Tok.getIdentifierInfo());
73    ConsumeToken();
74
75    if (Tok.isNot(tok::comma))
76      break;
77
78    ConsumeToken();
79  }
80
81  // Consume the ';'.
82  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, "@class"))
83    return 0;
84
85  return Actions.ActOnForwardClassDeclaration(atLoc,
86                                      &ClassNames[0], ClassNames.size());
87}
88
89///
90///   objc-interface:
91///     objc-class-interface-attributes[opt] objc-class-interface
92///     objc-category-interface
93///
94///   objc-class-interface:
95///     '@' 'interface' identifier objc-superclass[opt]
96///       objc-protocol-refs[opt]
97///       objc-class-instance-variables[opt]
98///       objc-interface-decl-list
99///     @end
100///
101///   objc-category-interface:
102///     '@' 'interface' identifier '(' identifier[opt] ')'
103///       objc-protocol-refs[opt]
104///       objc-interface-decl-list
105///     @end
106///
107///   objc-superclass:
108///     ':' identifier
109///
110///   objc-class-interface-attributes:
111///     __attribute__((visibility("default")))
112///     __attribute__((visibility("hidden")))
113///     __attribute__((deprecated))
114///     __attribute__((unavailable))
115///     __attribute__((objc_exception)) - used by NSException on 64-bit
116///
117Parser::DeclTy *Parser::ParseObjCAtInterfaceDeclaration(
118  SourceLocation atLoc, AttributeList *attrList) {
119  assert(Tok.isObjCAtKeyword(tok::objc_interface) &&
120         "ParseObjCAtInterfaceDeclaration(): Expected @interface");
121  ConsumeToken(); // the "interface" identifier
122
123  if (Tok.isNot(tok::identifier)) {
124    Diag(Tok, diag::err_expected_ident); // missing class or category name.
125    return 0;
126  }
127  // We have a class or category name - consume it.
128  IdentifierInfo *nameId = Tok.getIdentifierInfo();
129  SourceLocation nameLoc = ConsumeToken();
130
131  if (Tok.is(tok::l_paren)) { // we have a category.
132    SourceLocation lparenLoc = ConsumeParen();
133    SourceLocation categoryLoc, rparenLoc;
134    IdentifierInfo *categoryId = 0;
135
136    // For ObjC2, the category name is optional (not an error).
137    if (Tok.is(tok::identifier)) {
138      categoryId = Tok.getIdentifierInfo();
139      categoryLoc = ConsumeToken();
140    } else if (!getLang().ObjC2) {
141      Diag(Tok, diag::err_expected_ident); // missing category name.
142      return 0;
143    }
144    if (Tok.isNot(tok::r_paren)) {
145      Diag(Tok, diag::err_expected_rparen);
146      SkipUntil(tok::r_paren, false); // don't stop at ';'
147      return 0;
148    }
149    rparenLoc = ConsumeParen();
150
151    // Next, we need to check for any protocol references.
152    SourceLocation EndProtoLoc;
153    llvm::SmallVector<DeclTy *, 8> ProtocolRefs;
154    if (Tok.is(tok::less) &&
155        ParseObjCProtocolReferences(ProtocolRefs, true, EndProtoLoc))
156      return 0;
157
158    if (attrList) // categories don't support attributes.
159      Diag(Tok, diag::err_objc_no_attributes_on_category);
160
161    DeclTy *CategoryType = Actions.ActOnStartCategoryInterface(atLoc,
162                                     nameId, nameLoc, categoryId, categoryLoc,
163                                     &ProtocolRefs[0], ProtocolRefs.size(),
164                                     EndProtoLoc);
165
166    ParseObjCInterfaceDeclList(CategoryType, tok::objc_not_keyword);
167    return CategoryType;
168  }
169  // Parse a class interface.
170  IdentifierInfo *superClassId = 0;
171  SourceLocation superClassLoc;
172
173  if (Tok.is(tok::colon)) { // a super class is specified.
174    ConsumeToken();
175    if (Tok.isNot(tok::identifier)) {
176      Diag(Tok, diag::err_expected_ident); // missing super class name.
177      return 0;
178    }
179    superClassId = Tok.getIdentifierInfo();
180    superClassLoc = ConsumeToken();
181  }
182  // Next, we need to check for any protocol references.
183  llvm::SmallVector<Action::DeclTy*, 8> ProtocolRefs;
184  SourceLocation EndProtoLoc;
185  if (Tok.is(tok::less) &&
186      ParseObjCProtocolReferences(ProtocolRefs, true, EndProtoLoc))
187    return 0;
188
189  DeclTy *ClsType =
190    Actions.ActOnStartClassInterface(atLoc, nameId, nameLoc,
191                                     superClassId, superClassLoc,
192                                     &ProtocolRefs[0], ProtocolRefs.size(),
193                                     EndProtoLoc, attrList);
194
195  if (Tok.is(tok::l_brace))
196    ParseObjCClassInstanceVariables(ClsType, atLoc);
197
198  ParseObjCInterfaceDeclList(ClsType, tok::objc_interface);
199  return ClsType;
200}
201
202/// constructSetterName - Return the setter name for the given
203/// identifier, i.e. "set" + Name where the initial character of Name
204/// has been capitalized.
205static IdentifierInfo *constructSetterName(IdentifierTable &Idents,
206                                           const IdentifierInfo *Name) {
207  llvm::SmallString<100> SelectorName;
208  SelectorName = "set";
209  SelectorName.append(Name->getName(), Name->getName()+Name->getLength());
210  SelectorName[3] = toupper(SelectorName[3]);
211  return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]);
212}
213
214///   objc-interface-decl-list:
215///     empty
216///     objc-interface-decl-list objc-property-decl [OBJC2]
217///     objc-interface-decl-list objc-method-requirement [OBJC2]
218///     objc-interface-decl-list objc-method-proto ';'
219///     objc-interface-decl-list declaration
220///     objc-interface-decl-list ';'
221///
222///   objc-method-requirement: [OBJC2]
223///     @required
224///     @optional
225///
226void Parser::ParseObjCInterfaceDeclList(DeclTy *interfaceDecl,
227                                        tok::ObjCKeywordKind contextKey) {
228  llvm::SmallVector<DeclTy*, 32> allMethods;
229  llvm::SmallVector<DeclTy*, 16> allProperties;
230  tok::ObjCKeywordKind MethodImplKind = tok::objc_not_keyword;
231
232  SourceLocation AtEndLoc;
233
234  while (1) {
235    // If this is a method prototype, parse it.
236    if (Tok.is(tok::minus) || Tok.is(tok::plus)) {
237      DeclTy *methodPrototype =
238        ParseObjCMethodPrototype(interfaceDecl, MethodImplKind);
239      allMethods.push_back(methodPrototype);
240      // Consume the ';' here, since ParseObjCMethodPrototype() is re-used for
241      // method definitions.
242      ExpectAndConsume(tok::semi, diag::err_expected_semi_after,"method proto");
243      continue;
244    }
245
246    // Ignore excess semicolons.
247    if (Tok.is(tok::semi)) {
248      ConsumeToken();
249      continue;
250    }
251
252    // If we got to the end of the file, exit the loop.
253    if (Tok.is(tok::eof))
254      break;
255
256    // If we don't have an @ directive, parse it as a function definition.
257    if (Tok.isNot(tok::at)) {
258      // FIXME: as the name implies, this rule allows function definitions.
259      // We could pass a flag or check for functions during semantic analysis.
260      ParseDeclarationOrFunctionDefinition();
261      continue;
262    }
263
264    // Otherwise, we have an @ directive, eat the @.
265    SourceLocation AtLoc = ConsumeToken(); // the "@"
266    tok::ObjCKeywordKind DirectiveKind = Tok.getObjCKeywordID();
267
268    if (DirectiveKind == tok::objc_end) { // @end -> terminate list
269      AtEndLoc = AtLoc;
270      break;
271    }
272
273    // Eat the identifier.
274    ConsumeToken();
275
276    switch (DirectiveKind) {
277    default:
278      // FIXME: If someone forgets an @end on a protocol, this loop will
279      // continue to eat up tons of stuff and spew lots of nonsense errors.  It
280      // would probably be better to bail out if we saw an @class or @interface
281      // or something like that.
282      Diag(AtLoc, diag::err_objc_illegal_interface_qual);
283      // Skip until we see an '@' or '}' or ';'.
284      SkipUntil(tok::r_brace, tok::at);
285      break;
286
287    case tok::objc_required:
288    case tok::objc_optional:
289      // This is only valid on protocols.
290      // FIXME: Should this check for ObjC2 being enabled?
291      if (contextKey != tok::objc_protocol)
292        Diag(AtLoc, diag::err_objc_directive_only_in_protocol);
293      else
294        MethodImplKind = DirectiveKind;
295      break;
296
297    case tok::objc_property:
298      if (!getLang().ObjC2)
299        Diag(AtLoc, diag::err_objc_propertoes_require_objc2);
300
301      ObjCDeclSpec OCDS;
302      // Parse property attribute list, if any.
303      if (Tok.is(tok::l_paren))
304        ParseObjCPropertyAttribute(OCDS);
305
306      // Parse all the comma separated declarators.
307      DeclSpec DS;
308      llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
309      ParseStructDeclaration(DS, FieldDeclarators);
310
311      ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list, "",
312                       tok::at);
313
314      // Convert them all to property declarations.
315      for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
316        FieldDeclarator &FD = FieldDeclarators[i];
317        if (FD.D.getIdentifier() == 0) {
318          Diag(AtLoc, diag::err_objc_property_requires_field_name)
319            << FD.D.getSourceRange();
320          continue;
321        }
322
323        // Install the property declarator into interfaceDecl.
324        IdentifierInfo *SelName =
325          OCDS.getGetterName() ? OCDS.getGetterName() : FD.D.getIdentifier();
326
327        Selector GetterSel =
328          PP.getSelectorTable().getNullarySelector(SelName);
329        IdentifierInfo *SetterName = OCDS.getSetterName();
330        if (!SetterName)
331          SetterName = constructSetterName(PP.getIdentifierTable(),
332                                           FD.D.getIdentifier());
333        Selector SetterSel =
334          PP.getSelectorTable().getUnarySelector(SetterName);
335        bool isOverridingProperty = false;
336        DeclTy *Property = Actions.ActOnProperty(CurScope, AtLoc, FD, OCDS,
337                                                 GetterSel, SetterSel,
338                                                 interfaceDecl,
339                                                 &isOverridingProperty,
340                                                 MethodImplKind);
341        if (!isOverridingProperty)
342          allProperties.push_back(Property);
343      }
344      break;
345    }
346  }
347
348  // We break out of the big loop in two cases: when we see @end or when we see
349  // EOF.  In the former case, eat the @end.  In the later case, emit an error.
350  if (Tok.isObjCAtKeyword(tok::objc_end))
351    ConsumeToken(); // the "end" identifier
352  else
353    Diag(Tok, diag::err_objc_missing_end);
354
355  // Insert collected methods declarations into the @interface object.
356  // This passes in an invalid SourceLocation for AtEndLoc when EOF is hit.
357  Actions.ActOnAtEnd(AtEndLoc, interfaceDecl,
358                     allMethods.empty() ? 0 : &allMethods[0],
359                     allMethods.size(),
360                     allProperties.empty() ? 0 : &allProperties[0],
361                     allProperties.size());
362}
363
364///   Parse property attribute declarations.
365///
366///   property-attr-decl: '(' property-attrlist ')'
367///   property-attrlist:
368///     property-attribute
369///     property-attrlist ',' property-attribute
370///   property-attribute:
371///     getter '=' identifier
372///     setter '=' identifier ':'
373///     readonly
374///     readwrite
375///     assign
376///     retain
377///     copy
378///     nonatomic
379///
380void Parser::ParseObjCPropertyAttribute(ObjCDeclSpec &DS) {
381  assert(Tok.getKind() == tok::l_paren);
382  SourceLocation LHSLoc = ConsumeParen(); // consume '('
383
384  while (1) {
385    const IdentifierInfo *II = Tok.getIdentifierInfo();
386
387    // If this is not an identifier at all, bail out early.
388    if (II == 0) {
389      MatchRHSPunctuation(tok::r_paren, LHSLoc);
390      return;
391    }
392
393    SourceLocation AttrName = ConsumeToken(); // consume last attribute name
394
395    if (II->isStr("readonly"))
396      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_readonly);
397    else if (II->isStr("assign"))
398      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_assign);
399    else if (II->isStr("readwrite"))
400      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_readwrite);
401    else if (II->isStr("retain"))
402      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_retain);
403    else if (II->isStr("copy"))
404      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_copy);
405    else if (II->isStr("nonatomic"))
406      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_nonatomic);
407    else if (II->isStr("getter") || II->isStr("setter")) {
408      // getter/setter require extra treatment.
409      if (ExpectAndConsume(tok::equal, diag::err_objc_expected_equal, "",
410                           tok::r_paren))
411        return;
412
413      if (Tok.isNot(tok::identifier)) {
414        Diag(Tok, diag::err_expected_ident);
415        SkipUntil(tok::r_paren);
416        return;
417      }
418
419      if (II->getName()[0] == 's') {
420        DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_setter);
421        DS.setSetterName(Tok.getIdentifierInfo());
422        ConsumeToken();  // consume method name
423
424        if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "",
425                             tok::r_paren))
426          return;
427      } else {
428        DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_getter);
429        DS.setGetterName(Tok.getIdentifierInfo());
430        ConsumeToken();  // consume method name
431      }
432    } else {
433      Diag(AttrName, diag::err_objc_expected_property_attr) << II;
434      SkipUntil(tok::r_paren);
435      return;
436    }
437
438    if (Tok.isNot(tok::comma))
439      break;
440
441    ConsumeToken();
442  }
443
444  MatchRHSPunctuation(tok::r_paren, LHSLoc);
445}
446
447///   objc-method-proto:
448///     objc-instance-method objc-method-decl objc-method-attributes[opt]
449///     objc-class-method objc-method-decl objc-method-attributes[opt]
450///
451///   objc-instance-method: '-'
452///   objc-class-method: '+'
453///
454///   objc-method-attributes:         [OBJC2]
455///     __attribute__((deprecated))
456///
457Parser::DeclTy *Parser::ParseObjCMethodPrototype(DeclTy *IDecl,
458                          tok::ObjCKeywordKind MethodImplKind) {
459  assert((Tok.is(tok::minus) || Tok.is(tok::plus)) && "expected +/-");
460
461  tok::TokenKind methodType = Tok.getKind();
462  SourceLocation mLoc = ConsumeToken();
463
464  DeclTy *MDecl = ParseObjCMethodDecl(mLoc, methodType, IDecl, MethodImplKind);
465  // Since this rule is used for both method declarations and definitions,
466  // the caller is (optionally) responsible for consuming the ';'.
467  return MDecl;
468}
469
470///   objc-selector:
471///     identifier
472///     one of
473///       enum struct union if else while do for switch case default
474///       break continue return goto asm sizeof typeof __alignof
475///       unsigned long const short volatile signed restrict _Complex
476///       in out inout bycopy byref oneway int char float double void _Bool
477///
478IdentifierInfo *Parser::ParseObjCSelector(SourceLocation &SelectorLoc) {
479  switch (Tok.getKind()) {
480  default:
481    return 0;
482  case tok::identifier:
483  case tok::kw_asm:
484  case tok::kw_auto:
485  case tok::kw_bool:
486  case tok::kw_break:
487  case tok::kw_case:
488  case tok::kw_catch:
489  case tok::kw_char:
490  case tok::kw_class:
491  case tok::kw_const:
492  case tok::kw_const_cast:
493  case tok::kw_continue:
494  case tok::kw_default:
495  case tok::kw_delete:
496  case tok::kw_do:
497  case tok::kw_double:
498  case tok::kw_dynamic_cast:
499  case tok::kw_else:
500  case tok::kw_enum:
501  case tok::kw_explicit:
502  case tok::kw_export:
503  case tok::kw_extern:
504  case tok::kw_false:
505  case tok::kw_float:
506  case tok::kw_for:
507  case tok::kw_friend:
508  case tok::kw_goto:
509  case tok::kw_if:
510  case tok::kw_inline:
511  case tok::kw_int:
512  case tok::kw_long:
513  case tok::kw_mutable:
514  case tok::kw_namespace:
515  case tok::kw_new:
516  case tok::kw_operator:
517  case tok::kw_private:
518  case tok::kw_protected:
519  case tok::kw_public:
520  case tok::kw_register:
521  case tok::kw_reinterpret_cast:
522  case tok::kw_restrict:
523  case tok::kw_return:
524  case tok::kw_short:
525  case tok::kw_signed:
526  case tok::kw_sizeof:
527  case tok::kw_static:
528  case tok::kw_static_cast:
529  case tok::kw_struct:
530  case tok::kw_switch:
531  case tok::kw_template:
532  case tok::kw_this:
533  case tok::kw_throw:
534  case tok::kw_true:
535  case tok::kw_try:
536  case tok::kw_typedef:
537  case tok::kw_typeid:
538  case tok::kw_typename:
539  case tok::kw_typeof:
540  case tok::kw_union:
541  case tok::kw_unsigned:
542  case tok::kw_using:
543  case tok::kw_virtual:
544  case tok::kw_void:
545  case tok::kw_volatile:
546  case tok::kw_wchar_t:
547  case tok::kw_while:
548  case tok::kw__Bool:
549  case tok::kw__Complex:
550  case tok::kw___alignof:
551    IdentifierInfo *II = Tok.getIdentifierInfo();
552    SelectorLoc = ConsumeToken();
553    return II;
554  }
555}
556
557///  objc-for-collection-in: 'in'
558///
559bool Parser::isTokIdentifier_in() const {
560  // FIXME: May have to do additional look-ahead to only allow for
561  // valid tokens following an 'in'; such as an identifier, unary operators,
562  // '[' etc.
563  return (getLang().ObjC2 && Tok.is(tok::identifier) &&
564          Tok.getIdentifierInfo() == ObjCTypeQuals[objc_in]);
565}
566
567/// ParseObjCTypeQualifierList - This routine parses the objective-c's type
568/// qualifier list and builds their bitmask representation in the input
569/// argument.
570///
571///   objc-type-qualifiers:
572///     objc-type-qualifier
573///     objc-type-qualifiers objc-type-qualifier
574///
575void Parser::ParseObjCTypeQualifierList(ObjCDeclSpec &DS) {
576  while (1) {
577    if (Tok.isNot(tok::identifier))
578      return;
579
580    const IdentifierInfo *II = Tok.getIdentifierInfo();
581    for (unsigned i = 0; i != objc_NumQuals; ++i) {
582      if (II != ObjCTypeQuals[i])
583        continue;
584
585      ObjCDeclSpec::ObjCDeclQualifier Qual;
586      switch (i) {
587      default: assert(0 && "Unknown decl qualifier");
588      case objc_in:     Qual = ObjCDeclSpec::DQ_In; break;
589      case objc_out:    Qual = ObjCDeclSpec::DQ_Out; break;
590      case objc_inout:  Qual = ObjCDeclSpec::DQ_Inout; break;
591      case objc_oneway: Qual = ObjCDeclSpec::DQ_Oneway; break;
592      case objc_bycopy: Qual = ObjCDeclSpec::DQ_Bycopy; break;
593      case objc_byref:  Qual = ObjCDeclSpec::DQ_Byref; break;
594      }
595      DS.setObjCDeclQualifier(Qual);
596      ConsumeToken();
597      II = 0;
598      break;
599    }
600
601    // If this wasn't a recognized qualifier, bail out.
602    if (II) return;
603  }
604}
605
606///   objc-type-name:
607///     '(' objc-type-qualifiers[opt] type-name ')'
608///     '(' objc-type-qualifiers[opt] ')'
609///
610Parser::TypeTy *Parser::ParseObjCTypeName(ObjCDeclSpec &DS) {
611  assert(Tok.is(tok::l_paren) && "expected (");
612
613  SourceLocation LParenLoc = ConsumeParen();
614  SourceLocation TypeStartLoc = Tok.getLocation();
615
616  // Parse type qualifiers, in, inout, etc.
617  ParseObjCTypeQualifierList(DS);
618
619  TypeTy *Ty = 0;
620  if (isTypeSpecifierQualifier())
621    Ty = ParseTypeName();
622
623  if (Tok.is(tok::r_paren))
624    ConsumeParen();
625  else if (Tok.getLocation() == TypeStartLoc) {
626    // If we didn't eat any tokens, then this isn't a type.
627    Diag(Tok, diag::err_expected_type);
628    SkipUntil(tok::r_paren);
629  } else {
630    // Otherwise, we found *something*, but didn't get a ')' in the right
631    // place.  Emit an error then return what we have as the type.
632    MatchRHSPunctuation(tok::r_paren, LParenLoc);
633  }
634  return Ty;
635}
636
637///   objc-method-decl:
638///     objc-selector
639///     objc-keyword-selector objc-parmlist[opt]
640///     objc-type-name objc-selector
641///     objc-type-name objc-keyword-selector objc-parmlist[opt]
642///
643///   objc-keyword-selector:
644///     objc-keyword-decl
645///     objc-keyword-selector objc-keyword-decl
646///
647///   objc-keyword-decl:
648///     objc-selector ':' objc-type-name objc-keyword-attributes[opt] identifier
649///     objc-selector ':' objc-keyword-attributes[opt] identifier
650///     ':' objc-type-name objc-keyword-attributes[opt] identifier
651///     ':' objc-keyword-attributes[opt] identifier
652///
653///   objc-parmlist:
654///     objc-parms objc-ellipsis[opt]
655///
656///   objc-parms:
657///     objc-parms , parameter-declaration
658///
659///   objc-ellipsis:
660///     , ...
661///
662///   objc-keyword-attributes:         [OBJC2]
663///     __attribute__((unused))
664///
665Parser::DeclTy *Parser::ParseObjCMethodDecl(SourceLocation mLoc,
666                                            tok::TokenKind mType,
667                                            DeclTy *IDecl,
668                                            tok::ObjCKeywordKind MethodImplKind)
669{
670  // Parse the return type if present.
671  TypeTy *ReturnType = 0;
672  ObjCDeclSpec DSRet;
673  if (Tok.is(tok::l_paren))
674    ReturnType = ParseObjCTypeName(DSRet);
675
676  SourceLocation selLoc;
677  IdentifierInfo *SelIdent = ParseObjCSelector(selLoc);
678
679  if (!SelIdent) { // missing selector name.
680    Diag(Tok, diag::err_expected_selector_for_method)
681      << SourceRange(mLoc, Tok.getLocation());
682    // Skip until we get a ; or {}.
683    SkipUntil(tok::r_brace);
684    return 0;
685  }
686
687  if (Tok.isNot(tok::colon)) {
688    // If attributes exist after the method, parse them.
689    AttributeList *MethodAttrs = 0;
690    if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
691      MethodAttrs = ParseAttributes();
692
693    Selector Sel = PP.getSelectorTable().getNullarySelector(SelIdent);
694    return Actions.ActOnMethodDeclaration(mLoc, Tok.getLocation(),
695                                          mType, IDecl, DSRet, ReturnType, Sel,
696                                          0, 0, 0, MethodAttrs, MethodImplKind);
697  }
698
699  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
700  llvm::SmallVector<Action::TypeTy *, 12> KeyTypes;
701  llvm::SmallVector<ObjCDeclSpec, 12> ArgTypeQuals;
702  llvm::SmallVector<IdentifierInfo *, 12> ArgNames;
703
704  Action::TypeTy *TypeInfo;
705  while (1) {
706    KeyIdents.push_back(SelIdent);
707
708    // Each iteration parses a single keyword argument.
709    if (Tok.isNot(tok::colon)) {
710      Diag(Tok, diag::err_expected_colon);
711      break;
712    }
713    ConsumeToken(); // Eat the ':'.
714    ObjCDeclSpec DSType;
715    if (Tok.is(tok::l_paren)) // Parse the argument type.
716      TypeInfo = ParseObjCTypeName(DSType);
717    else
718      TypeInfo = 0;
719    KeyTypes.push_back(TypeInfo);
720    ArgTypeQuals.push_back(DSType);
721
722    // If attributes exist before the argument name, parse them.
723    if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
724      ParseAttributes(); // FIXME: pass attributes through.
725
726    if (Tok.isNot(tok::identifier)) {
727      Diag(Tok, diag::err_expected_ident); // missing argument name.
728      break;
729    }
730    ArgNames.push_back(Tok.getIdentifierInfo());
731    ConsumeToken(); // Eat the identifier.
732
733    // Check for another keyword selector.
734    SourceLocation Loc;
735    SelIdent = ParseObjCSelector(Loc);
736    if (!SelIdent && Tok.isNot(tok::colon))
737      break;
738    // We have a selector or a colon, continue parsing.
739  }
740
741  bool isVariadic = false;
742
743  // Parse the (optional) parameter list.
744  while (Tok.is(tok::comma)) {
745    ConsumeToken();
746    if (Tok.is(tok::ellipsis)) {
747      isVariadic = true;
748      ConsumeToken();
749      break;
750    }
751    // FIXME: implement this...
752    // Parse the c-style argument declaration-specifier.
753    DeclSpec DS;
754    ParseDeclarationSpecifiers(DS);
755    // Parse the declarator.
756    Declarator ParmDecl(DS, Declarator::PrototypeContext);
757    ParseDeclarator(ParmDecl);
758  }
759
760  // FIXME: Add support for optional parmameter list...
761  // If attributes exist after the method, parse them.
762  AttributeList *MethodAttrs = 0;
763  if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
764    MethodAttrs = ParseAttributes();
765
766  Selector Sel = PP.getSelectorTable().getSelector(KeyIdents.size(),
767                                                   &KeyIdents[0]);
768  return Actions.ActOnMethodDeclaration(mLoc, Tok.getLocation(),
769                                        mType, IDecl, DSRet, ReturnType, Sel,
770                                        &ArgTypeQuals[0], &KeyTypes[0],
771                                        &ArgNames[0], MethodAttrs,
772                                        MethodImplKind, isVariadic);
773}
774
775///   objc-protocol-refs:
776///     '<' identifier-list '>'
777///
778bool Parser::
779ParseObjCProtocolReferences(llvm::SmallVectorImpl<Action::DeclTy*> &Protocols,
780                            bool WarnOnDeclarations, SourceLocation &EndLoc) {
781  assert(Tok.is(tok::less) && "expected <");
782
783  ConsumeToken(); // the "<"
784
785  llvm::SmallVector<IdentifierLocPair, 8> ProtocolIdents;
786
787  while (1) {
788    if (Tok.isNot(tok::identifier)) {
789      Diag(Tok, diag::err_expected_ident);
790      SkipUntil(tok::greater);
791      return true;
792    }
793    ProtocolIdents.push_back(std::make_pair(Tok.getIdentifierInfo(),
794                                       Tok.getLocation()));
795    ConsumeToken();
796
797    if (Tok.isNot(tok::comma))
798      break;
799    ConsumeToken();
800  }
801
802  // Consume the '>'.
803  if (Tok.isNot(tok::greater)) {
804    Diag(Tok, diag::err_expected_greater);
805    return true;
806  }
807
808  EndLoc = ConsumeAnyToken();
809
810  // Convert the list of protocols identifiers into a list of protocol decls.
811  Actions.FindProtocolDeclaration(WarnOnDeclarations,
812                                  &ProtocolIdents[0], ProtocolIdents.size(),
813                                  Protocols);
814  return false;
815}
816
817///   objc-class-instance-variables:
818///     '{' objc-instance-variable-decl-list[opt] '}'
819///
820///   objc-instance-variable-decl-list:
821///     objc-visibility-spec
822///     objc-instance-variable-decl ';'
823///     ';'
824///     objc-instance-variable-decl-list objc-visibility-spec
825///     objc-instance-variable-decl-list objc-instance-variable-decl ';'
826///     objc-instance-variable-decl-list ';'
827///
828///   objc-visibility-spec:
829///     @private
830///     @protected
831///     @public
832///     @package [OBJC2]
833///
834///   objc-instance-variable-decl:
835///     struct-declaration
836///
837void Parser::ParseObjCClassInstanceVariables(DeclTy *interfaceDecl,
838                                             SourceLocation atLoc) {
839  assert(Tok.is(tok::l_brace) && "expected {");
840  llvm::SmallVector<DeclTy*, 32> AllIvarDecls;
841  llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
842
843  SourceLocation LBraceLoc = ConsumeBrace(); // the "{"
844
845  tok::ObjCKeywordKind visibility = tok::objc_protected;
846  // While we still have something to read, read the instance variables.
847  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
848    // Each iteration of this loop reads one objc-instance-variable-decl.
849
850    // Check for extraneous top-level semicolon.
851    if (Tok.is(tok::semi)) {
852      Diag(Tok, diag::ext_extra_struct_semi);
853      ConsumeToken();
854      continue;
855    }
856
857    // Set the default visibility to private.
858    if (Tok.is(tok::at)) { // parse objc-visibility-spec
859      ConsumeToken(); // eat the @ sign
860      switch (Tok.getObjCKeywordID()) {
861      case tok::objc_private:
862      case tok::objc_public:
863      case tok::objc_protected:
864      case tok::objc_package:
865        visibility = Tok.getObjCKeywordID();
866        ConsumeToken();
867        continue;
868      default:
869        Diag(Tok, diag::err_objc_illegal_visibility_spec);
870        continue;
871      }
872    }
873
874    // Parse all the comma separated declarators.
875    DeclSpec DS;
876    FieldDeclarators.clear();
877    ParseStructDeclaration(DS, FieldDeclarators);
878
879    // Convert them all to fields.
880    for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
881      FieldDeclarator &FD = FieldDeclarators[i];
882      // Install the declarator into interfaceDecl.
883      DeclTy *Field = Actions.ActOnIvar(CurScope,
884                                         DS.getSourceRange().getBegin(),
885                                         FD.D, FD.BitfieldSize, visibility);
886      AllIvarDecls.push_back(Field);
887    }
888
889    if (Tok.is(tok::semi)) {
890      ConsumeToken();
891    } else {
892      Diag(Tok, diag::err_expected_semi_decl_list);
893      // Skip to end of block or statement
894      SkipUntil(tok::r_brace, true, true);
895    }
896  }
897  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
898  // Call ActOnFields() even if we don't have any decls. This is useful
899  // for code rewriting tools that need to be aware of the empty list.
900  Actions.ActOnFields(CurScope, atLoc, interfaceDecl,
901                      &AllIvarDecls[0], AllIvarDecls.size(),
902                      LBraceLoc, RBraceLoc, 0);
903  return;
904}
905
906///   objc-protocol-declaration:
907///     objc-protocol-definition
908///     objc-protocol-forward-reference
909///
910///   objc-protocol-definition:
911///     @protocol identifier
912///       objc-protocol-refs[opt]
913///       objc-interface-decl-list
914///     @end
915///
916///   objc-protocol-forward-reference:
917///     @protocol identifier-list ';'
918///
919///   "@protocol identifier ;" should be resolved as "@protocol
920///   identifier-list ;": objc-interface-decl-list may not start with a
921///   semicolon in the first alternative if objc-protocol-refs are omitted.
922Parser::DeclTy *Parser::ParseObjCAtProtocolDeclaration(SourceLocation AtLoc,
923                                               AttributeList *attrList) {
924  assert(Tok.isObjCAtKeyword(tok::objc_protocol) &&
925         "ParseObjCAtProtocolDeclaration(): Expected @protocol");
926  ConsumeToken(); // the "protocol" identifier
927
928  if (Tok.isNot(tok::identifier)) {
929    Diag(Tok, diag::err_expected_ident); // missing protocol name.
930    return 0;
931  }
932  // Save the protocol name, then consume it.
933  IdentifierInfo *protocolName = Tok.getIdentifierInfo();
934  SourceLocation nameLoc = ConsumeToken();
935
936  if (Tok.is(tok::semi)) { // forward declaration of one protocol.
937    IdentifierLocPair ProtoInfo(protocolName, nameLoc);
938    ConsumeToken();
939    return Actions.ActOnForwardProtocolDeclaration(AtLoc, &ProtoInfo, 1);
940  }
941
942  if (Tok.is(tok::comma)) { // list of forward declarations.
943    llvm::SmallVector<IdentifierLocPair, 8> ProtocolRefs;
944    ProtocolRefs.push_back(std::make_pair(protocolName, nameLoc));
945
946    // Parse the list of forward declarations.
947    while (1) {
948      ConsumeToken(); // the ','
949      if (Tok.isNot(tok::identifier)) {
950        Diag(Tok, diag::err_expected_ident);
951        SkipUntil(tok::semi);
952        return 0;
953      }
954      ProtocolRefs.push_back(IdentifierLocPair(Tok.getIdentifierInfo(),
955                                               Tok.getLocation()));
956      ConsumeToken(); // the identifier
957
958      if (Tok.isNot(tok::comma))
959        break;
960    }
961    // Consume the ';'.
962    if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, "@protocol"))
963      return 0;
964
965    return Actions.ActOnForwardProtocolDeclaration(AtLoc,
966                                                   &ProtocolRefs[0],
967                                                   ProtocolRefs.size());
968  }
969
970  // Last, and definitely not least, parse a protocol declaration.
971  SourceLocation EndProtoLoc;
972
973  llvm::SmallVector<DeclTy *, 8> ProtocolRefs;
974  if (Tok.is(tok::less) &&
975      ParseObjCProtocolReferences(ProtocolRefs, true, EndProtoLoc))
976    return 0;
977
978  DeclTy *ProtoType =
979    Actions.ActOnStartProtocolInterface(AtLoc, protocolName, nameLoc,
980                                        &ProtocolRefs[0], ProtocolRefs.size(),
981                                        EndProtoLoc, attrList);
982  ParseObjCInterfaceDeclList(ProtoType, tok::objc_protocol);
983  return ProtoType;
984}
985
986///   objc-implementation:
987///     objc-class-implementation-prologue
988///     objc-category-implementation-prologue
989///
990///   objc-class-implementation-prologue:
991///     @implementation identifier objc-superclass[opt]
992///       objc-class-instance-variables[opt]
993///
994///   objc-category-implementation-prologue:
995///     @implementation identifier ( identifier )
996
997Parser::DeclTy *Parser::ParseObjCAtImplementationDeclaration(
998  SourceLocation atLoc) {
999  assert(Tok.isObjCAtKeyword(tok::objc_implementation) &&
1000         "ParseObjCAtImplementationDeclaration(): Expected @implementation");
1001  ConsumeToken(); // the "implementation" identifier
1002
1003  if (Tok.isNot(tok::identifier)) {
1004    Diag(Tok, diag::err_expected_ident); // missing class or category name.
1005    return 0;
1006  }
1007  // We have a class or category name - consume it.
1008  IdentifierInfo *nameId = Tok.getIdentifierInfo();
1009  SourceLocation nameLoc = ConsumeToken(); // consume class or category name
1010
1011  if (Tok.is(tok::l_paren)) {
1012    // we have a category implementation.
1013    SourceLocation lparenLoc = ConsumeParen();
1014    SourceLocation categoryLoc, rparenLoc;
1015    IdentifierInfo *categoryId = 0;
1016
1017    if (Tok.is(tok::identifier)) {
1018      categoryId = Tok.getIdentifierInfo();
1019      categoryLoc = ConsumeToken();
1020    } else {
1021      Diag(Tok, diag::err_expected_ident); // missing category name.
1022      return 0;
1023    }
1024    if (Tok.isNot(tok::r_paren)) {
1025      Diag(Tok, diag::err_expected_rparen);
1026      SkipUntil(tok::r_paren, false); // don't stop at ';'
1027      return 0;
1028    }
1029    rparenLoc = ConsumeParen();
1030    DeclTy *ImplCatType = Actions.ActOnStartCategoryImplementation(
1031                                    atLoc, nameId, nameLoc, categoryId,
1032                                    categoryLoc);
1033    ObjCImpDecl = ImplCatType;
1034    return 0;
1035  }
1036  // We have a class implementation
1037  SourceLocation superClassLoc;
1038  IdentifierInfo *superClassId = 0;
1039  if (Tok.is(tok::colon)) {
1040    // We have a super class
1041    ConsumeToken();
1042    if (Tok.isNot(tok::identifier)) {
1043      Diag(Tok, diag::err_expected_ident); // missing super class name.
1044      return 0;
1045    }
1046    superClassId = Tok.getIdentifierInfo();
1047    superClassLoc = ConsumeToken(); // Consume super class name
1048  }
1049  DeclTy *ImplClsType = Actions.ActOnStartClassImplementation(
1050                                  atLoc, nameId, nameLoc,
1051                                  superClassId, superClassLoc);
1052
1053  if (Tok.is(tok::l_brace)) // we have ivars
1054    ParseObjCClassInstanceVariables(ImplClsType/*FIXME*/, atLoc);
1055  ObjCImpDecl = ImplClsType;
1056
1057  return 0;
1058}
1059
1060Parser::DeclTy *Parser::ParseObjCAtEndDeclaration(SourceLocation atLoc) {
1061  assert(Tok.isObjCAtKeyword(tok::objc_end) &&
1062         "ParseObjCAtEndDeclaration(): Expected @end");
1063  ConsumeToken(); // the "end" identifier
1064  if (ObjCImpDecl)
1065    Actions.ActOnAtEnd(atLoc, ObjCImpDecl);
1066  else
1067    Diag(atLoc, diag::warn_expected_implementation); // missing @implementation
1068  return ObjCImpDecl;
1069}
1070
1071///   compatibility-alias-decl:
1072///     @compatibility_alias alias-name  class-name ';'
1073///
1074Parser::DeclTy *Parser::ParseObjCAtAliasDeclaration(SourceLocation atLoc) {
1075  assert(Tok.isObjCAtKeyword(tok::objc_compatibility_alias) &&
1076         "ParseObjCAtAliasDeclaration(): Expected @compatibility_alias");
1077  ConsumeToken(); // consume compatibility_alias
1078  if (Tok.isNot(tok::identifier)) {
1079    Diag(Tok, diag::err_expected_ident);
1080    return 0;
1081  }
1082  IdentifierInfo *aliasId = Tok.getIdentifierInfo();
1083  SourceLocation aliasLoc = ConsumeToken(); // consume alias-name
1084  if (Tok.isNot(tok::identifier)) {
1085    Diag(Tok, diag::err_expected_ident);
1086    return 0;
1087  }
1088  IdentifierInfo *classId = Tok.getIdentifierInfo();
1089  SourceLocation classLoc = ConsumeToken(); // consume class-name;
1090  if (Tok.isNot(tok::semi)) {
1091    Diag(Tok, diag::err_expected_semi_after) << "@compatibility_alias";
1092    return 0;
1093  }
1094  DeclTy *ClsType = Actions.ActOnCompatiblityAlias(atLoc,
1095                                                   aliasId, aliasLoc,
1096                                                   classId, classLoc);
1097  return ClsType;
1098}
1099
1100///   property-synthesis:
1101///     @synthesize property-ivar-list ';'
1102///
1103///   property-ivar-list:
1104///     property-ivar
1105///     property-ivar-list ',' property-ivar
1106///
1107///   property-ivar:
1108///     identifier
1109///     identifier '=' identifier
1110///
1111Parser::DeclTy *Parser::ParseObjCPropertySynthesize(SourceLocation atLoc) {
1112  assert(Tok.isObjCAtKeyword(tok::objc_synthesize) &&
1113         "ParseObjCPropertyDynamic(): Expected '@synthesize'");
1114  SourceLocation loc = ConsumeToken(); // consume synthesize
1115  if (Tok.isNot(tok::identifier)) {
1116    Diag(Tok, diag::err_expected_ident);
1117    return 0;
1118  }
1119  while (Tok.is(tok::identifier)) {
1120    IdentifierInfo *propertyIvar = 0;
1121    IdentifierInfo *propertyId = Tok.getIdentifierInfo();
1122    SourceLocation propertyLoc = ConsumeToken(); // consume property name
1123    if (Tok.is(tok::equal)) {
1124      // property '=' ivar-name
1125      ConsumeToken(); // consume '='
1126      if (Tok.isNot(tok::identifier)) {
1127        Diag(Tok, diag::err_expected_ident);
1128        break;
1129      }
1130      propertyIvar = Tok.getIdentifierInfo();
1131      ConsumeToken(); // consume ivar-name
1132    }
1133    Actions.ActOnPropertyImplDecl(atLoc, propertyLoc, true, ObjCImpDecl,
1134                                  propertyId, propertyIvar);
1135    if (Tok.isNot(tok::comma))
1136      break;
1137    ConsumeToken(); // consume ','
1138  }
1139  if (Tok.isNot(tok::semi))
1140    Diag(Tok, diag::err_expected_semi_after) << "@synthesize";
1141  return 0;
1142}
1143
1144///   property-dynamic:
1145///     @dynamic  property-list
1146///
1147///   property-list:
1148///     identifier
1149///     property-list ',' identifier
1150///
1151Parser::DeclTy *Parser::ParseObjCPropertyDynamic(SourceLocation atLoc) {
1152  assert(Tok.isObjCAtKeyword(tok::objc_dynamic) &&
1153         "ParseObjCPropertyDynamic(): Expected '@dynamic'");
1154  SourceLocation loc = ConsumeToken(); // consume dynamic
1155  if (Tok.isNot(tok::identifier)) {
1156    Diag(Tok, diag::err_expected_ident);
1157    return 0;
1158  }
1159  while (Tok.is(tok::identifier)) {
1160    IdentifierInfo *propertyId = Tok.getIdentifierInfo();
1161    SourceLocation propertyLoc = ConsumeToken(); // consume property name
1162    Actions.ActOnPropertyImplDecl(atLoc, propertyLoc, false, ObjCImpDecl,
1163                                  propertyId, 0);
1164
1165    if (Tok.isNot(tok::comma))
1166      break;
1167    ConsumeToken(); // consume ','
1168  }
1169  if (Tok.isNot(tok::semi))
1170    Diag(Tok, diag::err_expected_semi_after) << "@dynamic";
1171  return 0;
1172}
1173
1174///  objc-throw-statement:
1175///    throw expression[opt];
1176///
1177Parser::StmtResult Parser::ParseObjCThrowStmt(SourceLocation atLoc) {
1178  ExprResult Res;
1179  ConsumeToken(); // consume throw
1180  if (Tok.isNot(tok::semi)) {
1181    Res = ParseExpression();
1182    if (Res.isInvalid) {
1183      SkipUntil(tok::semi);
1184      return true;
1185    }
1186  }
1187  ConsumeToken(); // consume ';'
1188  return Actions.ActOnObjCAtThrowStmt(atLoc, Res.Val);
1189}
1190
1191/// objc-synchronized-statement:
1192///   @synchronized '(' expression ')' compound-statement
1193///
1194Parser::StmtResult Parser::ParseObjCSynchronizedStmt(SourceLocation atLoc) {
1195  ConsumeToken(); // consume synchronized
1196  if (Tok.isNot(tok::l_paren)) {
1197    Diag(Tok, diag::err_expected_lparen_after) << "@synchronized";
1198    return true;
1199  }
1200  ConsumeParen();  // '('
1201  ExprResult Res = ParseExpression();
1202  ExprGuard ResGuard(Actions, Res);
1203  if (Res.isInvalid) {
1204    SkipUntil(tok::semi);
1205    return true;
1206  }
1207  if (Tok.isNot(tok::r_paren)) {
1208    Diag(Tok, diag::err_expected_lbrace);
1209    return true;
1210  }
1211  ConsumeParen();  // ')'
1212  if (Tok.isNot(tok::l_brace)) {
1213    Diag(Tok, diag::err_expected_lbrace);
1214    return true;
1215  }
1216  // Enter a scope to hold everything within the compound stmt.  Compound
1217  // statements can always hold declarations.
1218  EnterScope(Scope::DeclScope);
1219
1220  StmtResult SynchBody = ParseCompoundStatementBody();
1221
1222  ExitScope();
1223  if (SynchBody.isInvalid)
1224    SynchBody = Actions.ActOnNullStmt(Tok.getLocation());
1225  return Actions.ActOnObjCAtSynchronizedStmt(atLoc, ResGuard.take(),
1226                                             SynchBody.Val);
1227}
1228
1229///  objc-try-catch-statement:
1230///    @try compound-statement objc-catch-list[opt]
1231///    @try compound-statement objc-catch-list[opt] @finally compound-statement
1232///
1233///  objc-catch-list:
1234///    @catch ( parameter-declaration ) compound-statement
1235///    objc-catch-list @catch ( catch-parameter-declaration ) compound-statement
1236///  catch-parameter-declaration:
1237///     parameter-declaration
1238///     '...' [OBJC2]
1239///
1240Parser::StmtResult Parser::ParseObjCTryStmt(SourceLocation atLoc) {
1241  bool catch_or_finally_seen = false;
1242
1243  ConsumeToken(); // consume try
1244  if (Tok.isNot(tok::l_brace)) {
1245    Diag(Tok, diag::err_expected_lbrace);
1246    return true;
1247  }
1248  StmtResult CatchStmts;
1249  StmtResult FinallyStmt;
1250  EnterScope(Scope::DeclScope);
1251  StmtResult TryBody = ParseCompoundStatementBody();
1252  ExitScope();
1253  if (TryBody.isInvalid)
1254    TryBody = Actions.ActOnNullStmt(Tok.getLocation());
1255  ExprGuard TryGuard(Actions, TryBody);
1256  ExprGuard CatchGuard(Actions), FinallyGuard(Actions);
1257
1258  while (Tok.is(tok::at)) {
1259    // At this point, we need to lookahead to determine if this @ is the start
1260    // of an @catch or @finally.  We don't want to consume the @ token if this
1261    // is an @try or @encode or something else.
1262    Token AfterAt = GetLookAheadToken(1);
1263    if (!AfterAt.isObjCAtKeyword(tok::objc_catch) &&
1264        !AfterAt.isObjCAtKeyword(tok::objc_finally))
1265      break;
1266
1267    SourceLocation AtCatchFinallyLoc = ConsumeToken();
1268    if (Tok.isObjCAtKeyword(tok::objc_catch)) {
1269      StmtTy *FirstPart = 0;
1270      ConsumeToken(); // consume catch
1271      if (Tok.is(tok::l_paren)) {
1272        ConsumeParen();
1273        EnterScope(Scope::DeclScope);
1274        if (Tok.isNot(tok::ellipsis)) {
1275          DeclSpec DS;
1276          ParseDeclarationSpecifiers(DS);
1277          // For some odd reason, the name of the exception variable is
1278          // optional. As a result, we need to use PrototypeContext.
1279          Declarator DeclaratorInfo(DS, Declarator::PrototypeContext);
1280          ParseDeclarator(DeclaratorInfo);
1281          if (DeclaratorInfo.getIdentifier()) {
1282            DeclTy *aBlockVarDecl = Actions.ActOnDeclarator(CurScope,
1283                                                          DeclaratorInfo, 0);
1284            StmtResult stmtResult =
1285              Actions.ActOnDeclStmt(aBlockVarDecl,
1286                                    DS.getSourceRange().getBegin(),
1287                                    DeclaratorInfo.getSourceRange().getEnd());
1288            FirstPart = stmtResult.isInvalid ? 0 : stmtResult.Val;
1289          }
1290        } else
1291          ConsumeToken(); // consume '...'
1292        SourceLocation RParenLoc = ConsumeParen();
1293
1294        StmtResult CatchBody(true);
1295        if (Tok.is(tok::l_brace))
1296          CatchBody = ParseCompoundStatementBody();
1297        else
1298          Diag(Tok, diag::err_expected_lbrace);
1299        if (CatchBody.isInvalid)
1300          CatchBody = Actions.ActOnNullStmt(Tok.getLocation());
1301        CatchStmts = Actions.ActOnObjCAtCatchStmt(AtCatchFinallyLoc, RParenLoc,
1302          FirstPart, CatchBody.Val, CatchGuard.take());
1303        CatchGuard.reset(CatchStmts);
1304        ExitScope();
1305      } else {
1306        Diag(AtCatchFinallyLoc, diag::err_expected_lparen_after)
1307          << "@catch clause";
1308        return true;
1309      }
1310      catch_or_finally_seen = true;
1311    } else {
1312      assert(Tok.isObjCAtKeyword(tok::objc_finally) && "Lookahead confused?");
1313      ConsumeToken(); // consume finally
1314      EnterScope(Scope::DeclScope);
1315
1316
1317      StmtResult FinallyBody(true);
1318      if (Tok.is(tok::l_brace))
1319        FinallyBody = ParseCompoundStatementBody();
1320      else
1321        Diag(Tok, diag::err_expected_lbrace);
1322      if (FinallyBody.isInvalid)
1323        FinallyBody = Actions.ActOnNullStmt(Tok.getLocation());
1324      FinallyStmt = Actions.ActOnObjCAtFinallyStmt(AtCatchFinallyLoc,
1325                                                   FinallyBody.Val);
1326      FinallyGuard.reset(FinallyStmt);
1327      catch_or_finally_seen = true;
1328      ExitScope();
1329      break;
1330    }
1331  }
1332  if (!catch_or_finally_seen) {
1333    Diag(atLoc, diag::err_missing_catch_finally);
1334    return true;
1335  }
1336  return Actions.ActOnObjCAtTryStmt(atLoc, TryGuard.take(), CatchGuard.take(),
1337                                    FinallyGuard.take());
1338}
1339
1340///   objc-method-def: objc-method-proto ';'[opt] '{' body '}'
1341///
1342Parser::DeclTy *Parser::ParseObjCMethodDefinition() {
1343  DeclTy *MDecl = ParseObjCMethodPrototype(ObjCImpDecl);
1344  // parse optional ';'
1345  if (Tok.is(tok::semi))
1346    ConsumeToken();
1347
1348  // We should have an opening brace now.
1349  if (Tok.isNot(tok::l_brace)) {
1350    Diag(Tok, diag::err_expected_method_body);
1351
1352    // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1353    SkipUntil(tok::l_brace, true, true);
1354
1355    // If we didn't find the '{', bail out.
1356    if (Tok.isNot(tok::l_brace))
1357      return 0;
1358  }
1359  SourceLocation BraceLoc = Tok.getLocation();
1360
1361  // Enter a scope for the method body.
1362  EnterScope(Scope::FnScope|Scope::DeclScope);
1363
1364  // Tell the actions module that we have entered a method definition with the
1365  // specified Declarator for the method.
1366  Actions.ObjCActOnStartOfMethodDef(CurScope, MDecl);
1367
1368  StmtResult FnBody = ParseCompoundStatementBody();
1369
1370  // If the function body could not be parsed, make a bogus compoundstmt.
1371  if (FnBody.isInvalid)
1372    FnBody = Actions.ActOnCompoundStmt(BraceLoc, BraceLoc, 0, 0, false);
1373
1374  // Leave the function body scope.
1375  ExitScope();
1376
1377  // TODO: Pass argument information.
1378  Actions.ActOnFinishFunctionBody(MDecl, FnBody.Val);
1379  return MDecl;
1380}
1381
1382Parser::StmtResult Parser::ParseObjCAtStatement(SourceLocation AtLoc) {
1383  if (Tok.isObjCAtKeyword(tok::objc_try)) {
1384    return ParseObjCTryStmt(AtLoc);
1385  } else if (Tok.isObjCAtKeyword(tok::objc_throw))
1386    return ParseObjCThrowStmt(AtLoc);
1387  else if (Tok.isObjCAtKeyword(tok::objc_synchronized))
1388    return ParseObjCSynchronizedStmt(AtLoc);
1389  ExprResult Res = ParseExpressionWithLeadingAt(AtLoc);
1390  if (Res.isInvalid) {
1391    // If the expression is invalid, skip ahead to the next semicolon. Not
1392    // doing this opens us up to the possibility of infinite loops if
1393    // ParseExpression does not consume any tokens.
1394    SkipUntil(tok::semi);
1395    return true;
1396  }
1397  // Otherwise, eat the semicolon.
1398  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr);
1399  return Actions.ActOnExprStmt(Res.Val);
1400}
1401
1402Parser::ExprResult Parser::ParseObjCAtExpression(SourceLocation AtLoc) {
1403  switch (Tok.getKind()) {
1404  case tok::string_literal:    // primary-expression: string-literal
1405  case tok::wide_string_literal:
1406    return ParsePostfixExpressionSuffix(ParseObjCStringLiteral(AtLoc));
1407  default:
1408    if (Tok.getIdentifierInfo() == 0)
1409      return Diag(AtLoc, diag::err_unexpected_at);
1410
1411    switch (Tok.getIdentifierInfo()->getObjCKeywordID()) {
1412    case tok::objc_encode:
1413      return ParsePostfixExpressionSuffix(ParseObjCEncodeExpression(AtLoc));
1414    case tok::objc_protocol:
1415      return ParsePostfixExpressionSuffix(ParseObjCProtocolExpression(AtLoc));
1416    case tok::objc_selector:
1417      return ParsePostfixExpressionSuffix(ParseObjCSelectorExpression(AtLoc));
1418    default:
1419        return Diag(AtLoc, diag::err_unexpected_at);
1420    }
1421  }
1422}
1423
1424///   objc-message-expr:
1425///     '[' objc-receiver objc-message-args ']'
1426///
1427///   objc-receiver:
1428///     expression
1429///     class-name
1430///     type-name
1431Parser::ExprResult Parser::ParseObjCMessageExpression() {
1432  assert(Tok.is(tok::l_square) && "'[' expected");
1433  SourceLocation LBracLoc = ConsumeBracket(); // consume '['
1434
1435  // Parse receiver
1436  if (isTokObjCMessageIdentifierReceiver()) {
1437    IdentifierInfo *ReceiverName = Tok.getIdentifierInfo();
1438    SourceLocation NameLoc = ConsumeToken();
1439    return ParseObjCMessageExpressionBody(LBracLoc, NameLoc, ReceiverName, 0);
1440  }
1441
1442  ExprResult Res = ParseExpression();
1443  if (Res.isInvalid) {
1444    SkipUntil(tok::r_square);
1445    return Res;
1446  }
1447
1448  return ParseObjCMessageExpressionBody(LBracLoc, SourceLocation(), 0, Res.Val);
1449}
1450
1451/// ParseObjCMessageExpressionBody - Having parsed "'[' objc-receiver", parse
1452/// the rest of a message expression.
1453///
1454///   objc-message-args:
1455///     objc-selector
1456///     objc-keywordarg-list
1457///
1458///   objc-keywordarg-list:
1459///     objc-keywordarg
1460///     objc-keywordarg-list objc-keywordarg
1461///
1462///   objc-keywordarg:
1463///     selector-name[opt] ':' objc-keywordexpr
1464///
1465///   objc-keywordexpr:
1466///     nonempty-expr-list
1467///
1468///   nonempty-expr-list:
1469///     assignment-expression
1470///     nonempty-expr-list , assignment-expression
1471///
1472Parser::ExprResult
1473Parser::ParseObjCMessageExpressionBody(SourceLocation LBracLoc,
1474                                       SourceLocation NameLoc,
1475                                       IdentifierInfo *ReceiverName,
1476                                       ExprTy *ReceiverExpr) {
1477  // Parse objc-selector
1478  SourceLocation Loc;
1479  IdentifierInfo *selIdent = ParseObjCSelector(Loc);
1480
1481  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
1482  ExprVector KeyExprs(Actions);
1483
1484  if (Tok.is(tok::colon)) {
1485    while (1) {
1486      // Each iteration parses a single keyword argument.
1487      KeyIdents.push_back(selIdent);
1488
1489      if (Tok.isNot(tok::colon)) {
1490        Diag(Tok, diag::err_expected_colon);
1491        // We must manually skip to a ']', otherwise the expression skipper will
1492        // stop at the ']' when it skips to the ';'.  We want it to skip beyond
1493        // the enclosing expression.
1494        SkipUntil(tok::r_square);
1495        return true;
1496      }
1497
1498      ConsumeToken(); // Eat the ':'.
1499      ///  Parse the expression after ':'
1500      ExprResult Res = ParseAssignmentExpression();
1501      if (Res.isInvalid) {
1502        // We must manually skip to a ']', otherwise the expression skipper will
1503        // stop at the ']' when it skips to the ';'.  We want it to skip beyond
1504        // the enclosing expression.
1505        SkipUntil(tok::r_square);
1506        return Res;
1507      }
1508
1509      // We have a valid expression.
1510      KeyExprs.push_back(Res.Val);
1511
1512      // Check for another keyword selector.
1513      selIdent = ParseObjCSelector(Loc);
1514      if (!selIdent && Tok.isNot(tok::colon))
1515        break;
1516      // We have a selector or a colon, continue parsing.
1517    }
1518    // Parse the, optional, argument list, comma separated.
1519    while (Tok.is(tok::comma)) {
1520      ConsumeToken(); // Eat the ','.
1521      ///  Parse the expression after ','
1522      ExprResult Res = ParseAssignmentExpression();
1523      if (Res.isInvalid) {
1524        // We must manually skip to a ']', otherwise the expression skipper will
1525        // stop at the ']' when it skips to the ';'.  We want it to skip beyond
1526        // the enclosing expression.
1527        SkipUntil(tok::r_square);
1528        return Res;
1529      }
1530
1531      // We have a valid expression.
1532      KeyExprs.push_back(Res.Val);
1533    }
1534  } else if (!selIdent) {
1535    Diag(Tok, diag::err_expected_ident); // missing selector name.
1536
1537    // We must manually skip to a ']', otherwise the expression skipper will
1538    // stop at the ']' when it skips to the ';'.  We want it to skip beyond
1539    // the enclosing expression.
1540    SkipUntil(tok::r_square);
1541    return true;
1542  }
1543
1544  if (Tok.isNot(tok::r_square)) {
1545    Diag(Tok, diag::err_expected_rsquare);
1546    // We must manually skip to a ']', otherwise the expression skipper will
1547    // stop at the ']' when it skips to the ';'.  We want it to skip beyond
1548    // the enclosing expression.
1549    SkipUntil(tok::r_square);
1550    return true;
1551  }
1552
1553  SourceLocation RBracLoc = ConsumeBracket(); // consume ']'
1554
1555  unsigned nKeys = KeyIdents.size();
1556  if (nKeys == 0)
1557    KeyIdents.push_back(selIdent);
1558  Selector Sel = PP.getSelectorTable().getSelector(nKeys, &KeyIdents[0]);
1559
1560  // We've just parsed a keyword message.
1561  if (ReceiverName)
1562    return Actions.ActOnClassMessage(CurScope,
1563                                     ReceiverName, Sel,
1564                                     LBracLoc, NameLoc, RBracLoc,
1565                                     KeyExprs.take(), KeyExprs.size());
1566  return Actions.ActOnInstanceMessage(ReceiverExpr, Sel, LBracLoc, RBracLoc,
1567                                      KeyExprs.take(), KeyExprs.size());
1568}
1569
1570Parser::ExprResult Parser::ParseObjCStringLiteral(SourceLocation AtLoc) {
1571  ExprResult Res = ParseStringLiteralExpression();
1572  if (Res.isInvalid) return Res;
1573
1574  // @"foo" @"bar" is a valid concatenated string.  Eat any subsequent string
1575  // expressions.  At this point, we know that the only valid thing that starts
1576  // with '@' is an @"".
1577  llvm::SmallVector<SourceLocation, 4> AtLocs;
1578  ExprVector AtStrings(Actions);
1579  AtLocs.push_back(AtLoc);
1580  AtStrings.push_back(Res.Val);
1581
1582  while (Tok.is(tok::at)) {
1583    AtLocs.push_back(ConsumeToken()); // eat the @.
1584
1585    ExprResult Lit(true);  // Invalid unless there is a string literal.
1586    if (isTokenStringLiteral())
1587      Lit = ParseStringLiteralExpression();
1588    else
1589      Diag(Tok, diag::err_objc_concat_string);
1590
1591    if (Lit.isInvalid)
1592      return Lit;
1593
1594    AtStrings.push_back(Lit.Val);
1595  }
1596
1597  return Actions.ParseObjCStringLiteral(&AtLocs[0], AtStrings.take(),
1598                                        AtStrings.size());
1599}
1600
1601///    objc-encode-expression:
1602///      @encode ( type-name )
1603Parser::ExprResult Parser::ParseObjCEncodeExpression(SourceLocation AtLoc) {
1604  assert(Tok.isObjCAtKeyword(tok::objc_encode) && "Not an @encode expression!");
1605
1606  SourceLocation EncLoc = ConsumeToken();
1607
1608  if (Tok.isNot(tok::l_paren))
1609    return Diag(Tok, diag::err_expected_lparen_after) << "@encode";
1610
1611  SourceLocation LParenLoc = ConsumeParen();
1612
1613  TypeTy *Ty = ParseTypeName();
1614
1615  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1616
1617  return Actions.ParseObjCEncodeExpression(AtLoc, EncLoc, LParenLoc, Ty,
1618                                           RParenLoc);
1619}
1620
1621///     objc-protocol-expression
1622///       @protocol ( protocol-name )
1623Parser::ExprResult Parser::ParseObjCProtocolExpression(SourceLocation AtLoc) {
1624  SourceLocation ProtoLoc = ConsumeToken();
1625
1626  if (Tok.isNot(tok::l_paren))
1627    return Diag(Tok, diag::err_expected_lparen_after) << "@protocol";
1628
1629  SourceLocation LParenLoc = ConsumeParen();
1630
1631  if (Tok.isNot(tok::identifier))
1632    return Diag(Tok, diag::err_expected_ident);
1633
1634  IdentifierInfo *protocolId = Tok.getIdentifierInfo();
1635  ConsumeToken();
1636
1637  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1638
1639  return Actions.ParseObjCProtocolExpression(protocolId, AtLoc, ProtoLoc,
1640                                             LParenLoc, RParenLoc);
1641}
1642
1643///     objc-selector-expression
1644///       @selector '(' objc-keyword-selector ')'
1645Parser::ExprResult Parser::ParseObjCSelectorExpression(SourceLocation AtLoc) {
1646  SourceLocation SelectorLoc = ConsumeToken();
1647
1648  if (Tok.isNot(tok::l_paren))
1649    return Diag(Tok, diag::err_expected_lparen_after) << "@selector";
1650
1651  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
1652  SourceLocation LParenLoc = ConsumeParen();
1653  SourceLocation sLoc;
1654  IdentifierInfo *SelIdent = ParseObjCSelector(sLoc);
1655  if (!SelIdent && Tok.isNot(tok::colon))
1656    return Diag(Tok, diag::err_expected_ident); // missing selector name.
1657
1658  KeyIdents.push_back(SelIdent);
1659  unsigned nColons = 0;
1660  if (Tok.isNot(tok::r_paren)) {
1661    while (1) {
1662      if (Tok.isNot(tok::colon))
1663        return Diag(Tok, diag::err_expected_colon);
1664
1665      nColons++;
1666      ConsumeToken(); // Eat the ':'.
1667      if (Tok.is(tok::r_paren))
1668        break;
1669      // Check for another keyword selector.
1670      SourceLocation Loc;
1671      SelIdent = ParseObjCSelector(Loc);
1672      KeyIdents.push_back(SelIdent);
1673      if (!SelIdent && Tok.isNot(tok::colon))
1674        break;
1675    }
1676  }
1677  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1678  Selector Sel = PP.getSelectorTable().getSelector(nColons, &KeyIdents[0]);
1679  return Actions.ParseObjCSelectorExpression(Sel, AtLoc, SelectorLoc, LParenLoc,
1680                                             RParenLoc);
1681 }
1682