ParseObjc.cpp revision 5928cb633d5d5e73c598d5625bf717a57e6b10a3 
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 "clang/Basic/Diagnostic.h"
18#include "llvm/ADT/SmallVector.h"
19using namespace clang;
20
21
22/// ParseExternalDeclaration:
23///       external-declaration: [C99 6.9]
24/// [OBJC]  objc-class-definition
25/// [OBJC]  objc-class-declaration
26/// [OBJC]  objc-alias-declaration
27/// [OBJC]  objc-protocol-definition
28/// [OBJC]  objc-method-definition
29/// [OBJC]  '@' 'end'
30Parser::DeclTy *Parser::ParseObjCAtDirectives() {
31  SourceLocation AtLoc = ConsumeToken(); // the "@"
32
33  switch (Tok.getObjCKeywordID()) {
34    case tok::objc_class:
35      return ParseObjCAtClassDeclaration(AtLoc);
36    case tok::objc_interface:
37      return ParseObjCAtInterfaceDeclaration(AtLoc);
38    case tok::objc_protocol:
39      return ParseObjCAtProtocolDeclaration(AtLoc);
40    case tok::objc_implementation:
41      return ParseObjCAtImplementationDeclaration(AtLoc);
42    case tok::objc_end:
43      return ParseObjCAtEndDeclaration(AtLoc);
44    case tok::objc_compatibility_alias:
45      return ParseObjCAtAliasDeclaration(AtLoc);
46    case tok::objc_synthesize:
47      return ParseObjCPropertySynthesize(AtLoc);
48    case tok::objc_dynamic:
49      return ParseObjCPropertyDynamic(AtLoc);
50    default:
51      Diag(AtLoc, diag::err_unexpected_at);
52      SkipUntil(tok::semi);
53      return 0;
54  }
55}
56
57///
58/// objc-class-declaration:
59///    '@' 'class' identifier-list ';'
60///
61Parser::DeclTy *Parser::ParseObjCAtClassDeclaration(SourceLocation atLoc) {
62  ConsumeToken(); // the identifier "class"
63  llvm::SmallVector<IdentifierInfo *, 8> ClassNames;
64
65  while (1) {
66    if (Tok.isNot(tok::identifier)) {
67      Diag(Tok, diag::err_expected_ident);
68      SkipUntil(tok::semi);
69      return 0;
70    }
71    ClassNames.push_back(Tok.getIdentifierInfo());
72    ConsumeToken();
73
74    if (Tok.isNot(tok::comma))
75      break;
76
77    ConsumeToken();
78  }
79
80  // Consume the ';'.
81  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, "@class"))
82    return 0;
83
84  return Actions.ActOnForwardClassDeclaration(atLoc,
85                                      &ClassNames[0], ClassNames.size());
86}
87
88///
89///   objc-interface:
90///     objc-class-interface-attributes[opt] objc-class-interface
91///     objc-category-interface
92///
93///   objc-class-interface:
94///     '@' 'interface' identifier objc-superclass[opt]
95///       objc-protocol-refs[opt]
96///       objc-class-instance-variables[opt]
97///       objc-interface-decl-list
98///     @end
99///
100///   objc-category-interface:
101///     '@' 'interface' identifier '(' identifier[opt] ')'
102///       objc-protocol-refs[opt]
103///       objc-interface-decl-list
104///     @end
105///
106///   objc-superclass:
107///     ':' identifier
108///
109///   objc-class-interface-attributes:
110///     __attribute__((visibility("default")))
111///     __attribute__((visibility("hidden")))
112///     __attribute__((deprecated))
113///     __attribute__((unavailable))
114///     __attribute__((objc_exception)) - used by NSException on 64-bit
115///
116Parser::DeclTy *Parser::ParseObjCAtInterfaceDeclaration(
117  SourceLocation atLoc, AttributeList *attrList) {
118  assert(Tok.isObjCAtKeyword(tok::objc_interface) &&
119         "ParseObjCAtInterfaceDeclaration(): Expected @interface");
120  ConsumeToken(); // the "interface" identifier
121
122  if (Tok.isNot(tok::identifier)) {
123    Diag(Tok, diag::err_expected_ident); // missing class or category name.
124    return 0;
125  }
126  // We have a class or category name - consume it.
127  IdentifierInfo *nameId = Tok.getIdentifierInfo();
128  SourceLocation nameLoc = ConsumeToken();
129
130  if (Tok.is(tok::l_paren)) { // we have a category.
131    SourceLocation lparenLoc = ConsumeParen();
132    SourceLocation categoryLoc, rparenLoc;
133    IdentifierInfo *categoryId = 0;
134    llvm::SmallVector<IdentifierLocPair, 8> ProtocolRefs;
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    SourceLocation endProtoLoc;
151    // Next, we need to check for any protocol references.
152    if (Tok.is(tok::less)) {
153      if (ParseObjCProtocolReferences(ProtocolRefs, endProtoLoc))
154        return 0;
155    }
156    if (attrList) // categories don't support attributes.
157      Diag(Tok, diag::err_objc_no_attributes_on_category);
158
159    DeclTy *CategoryType = Actions.ActOnStartCategoryInterface(atLoc,
160                                     nameId, nameLoc, categoryId, categoryLoc,
161                                     &ProtocolRefs[0], ProtocolRefs.size(),
162                                     endProtoLoc);
163
164    ParseObjCInterfaceDeclList(CategoryType, tok::objc_not_keyword);
165
166    // The @ sign was already consumed by ParseObjCInterfaceDeclList().
167    if (Tok.isObjCAtKeyword(tok::objc_end)) {
168      ConsumeToken(); // the "end" identifier
169      return CategoryType;
170    }
171    Diag(Tok, diag::err_objc_missing_end);
172    return 0;
173  }
174  // Parse a class interface.
175  IdentifierInfo *superClassId = 0;
176  SourceLocation superClassLoc;
177
178  if (Tok.is(tok::colon)) { // a super class is specified.
179    ConsumeToken();
180    if (Tok.isNot(tok::identifier)) {
181      Diag(Tok, diag::err_expected_ident); // missing super class name.
182      return 0;
183    }
184    superClassId = Tok.getIdentifierInfo();
185    superClassLoc = ConsumeToken();
186  }
187  // Next, we need to check for any protocol references.
188  llvm::SmallVector<IdentifierLocPair, 8> ProtocolRefs;
189  SourceLocation endProtoLoc;
190  if (Tok.is(tok::less)) {
191    if (ParseObjCProtocolReferences(ProtocolRefs, endProtoLoc))
192      return 0;
193  }
194  DeclTy *ClsType = Actions.ActOnStartClassInterface(
195                      atLoc, nameId, nameLoc,
196                      superClassId, superClassLoc, &ProtocolRefs[0],
197                      ProtocolRefs.size(), endProtoLoc, attrList);
198
199  if (Tok.is(tok::l_brace))
200    ParseObjCClassInstanceVariables(ClsType, atLoc);
201
202  ParseObjCInterfaceDeclList(ClsType, tok::objc_interface);
203
204  // The @ sign was already consumed by ParseObjCInterfaceDeclList().
205  if (Tok.isObjCAtKeyword(tok::objc_end)) {
206    ConsumeToken(); // the "end" identifier
207    return ClsType;
208  }
209  Diag(Tok, diag::err_objc_missing_end);
210  return 0;
211}
212
213///   objc-interface-decl-list:
214///     empty
215///     objc-interface-decl-list objc-property-decl [OBJC2]
216///     objc-interface-decl-list objc-method-requirement [OBJC2]
217///     objc-interface-decl-list objc-method-proto ';'
218///     objc-interface-decl-list declaration
219///     objc-interface-decl-list ';'
220///
221///   objc-method-requirement: [OBJC2]
222///     @required
223///     @optional
224///
225void Parser::ParseObjCInterfaceDeclList(DeclTy *interfaceDecl,
226                                        tok::ObjCKeywordKind contextKey) {
227  llvm::SmallVector<DeclTy*, 32> allMethods;
228  llvm::SmallVector<DeclTy*, 16> allProperties;
229  tok::ObjCKeywordKind MethodImplKind = tok::objc_not_keyword;
230  SourceLocation AtEndLoc;
231
232  while (1) {
233    if (Tok.is(tok::at)) {
234      SourceLocation AtLoc = ConsumeToken(); // the "@"
235      tok::ObjCKeywordKind ocKind = Tok.getObjCKeywordID();
236
237      if (ocKind == tok::objc_end) { // terminate list
238        AtEndLoc = AtLoc;
239        break;
240      } else if (ocKind == tok::objc_required) { // protocols only
241        ConsumeToken();
242        MethodImplKind = ocKind;
243        if (contextKey != tok::objc_protocol)
244          Diag(AtLoc, diag::err_objc_protocol_required);
245      } else if (ocKind == tok::objc_optional) { // protocols only
246        ConsumeToken();
247        MethodImplKind = ocKind;
248        if (contextKey != tok::objc_protocol)
249          Diag(AtLoc, diag::err_objc_protocol_optional);
250      } else if (ocKind == tok::objc_property) {
251        ObjCDeclSpec OCDS;
252        ConsumeToken(); // the "property" identifier
253        // Parse property attribute list, if any.
254        if (Tok.is(tok::l_paren)) {
255          // property has attribute list.
256          ParseObjCPropertyAttribute(OCDS);
257        }
258        // Parse all the comma separated declarators.
259        DeclSpec DS;
260        llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
261        ParseStructDeclaration(DS, FieldDeclarators);
262
263        if (Tok.is(tok::semi))
264          ConsumeToken();
265        else {
266          Diag(Tok, diag::err_expected_semi_decl_list);
267          SkipUntil(tok::r_brace, true, true);
268        }
269        // Convert them all to property declarations.
270        for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
271          FieldDeclarator &FD = FieldDeclarators[i];
272          // Install the property declarator into interfaceDecl.
273          Selector GetterSel =
274          PP.getSelectorTable().getNullarySelector(OCDS.getGetterName()
275                                                   ? OCDS.getGetterName()
276                                                   : FD.D.getIdentifier());
277          Selector SetterSel =
278          PP.getSelectorTable().getNullarySelector(OCDS.getSetterName()
279                                                   ? OCDS.getSetterName()
280                                                   // FIXME. This is not right!
281                                                   : FD.D.getIdentifier());
282          DeclTy *Property = Actions.ActOnProperty(CurScope,
283                               AtLoc, FD, OCDS,
284                               GetterSel, SetterSel,
285                               MethodImplKind);
286          allProperties.push_back(Property);
287        }
288        continue;
289      } else {
290        Diag(Tok, diag::err_objc_illegal_interface_qual);
291        ConsumeToken();
292      }
293    }
294    if (Tok.is(tok::minus) || Tok.is(tok::plus)) {
295      DeclTy *methodPrototype =
296        ParseObjCMethodPrototype(interfaceDecl, MethodImplKind);
297      allMethods.push_back(methodPrototype);
298      // Consume the ';' here, since ParseObjCMethodPrototype() is re-used for
299      // method definitions.
300      ExpectAndConsume(tok::semi, diag::err_expected_semi_after,"method proto");
301      continue;
302    }
303    else if (Tok.is(tok::at))
304      continue;
305
306    if (Tok.is(tok::semi))
307      ConsumeToken();
308    else if (Tok.is(tok::eof))
309      break;
310    else {
311      // FIXME: as the name implies, this rule allows function definitions.
312      // We could pass a flag or check for functions during semantic analysis.
313      ParseDeclarationOrFunctionDefinition();
314    }
315  }
316  /// Insert collected methods declarations into the @interface object.
317  Actions.ActOnAtEnd(AtEndLoc, interfaceDecl,
318                     allMethods.empty() ? 0 : &allMethods[0],
319                     allMethods.size(),
320                     allProperties.empty() ? 0 : &allProperties[0],
321                     allProperties.size());
322}
323
324///   Parse property attribute declarations.
325///
326///   property-attr-decl: '(' property-attrlist ')'
327///   property-attrlist:
328///     property-attribute
329///     property-attrlist ',' property-attribute
330///   property-attribute:
331///     getter '=' identifier
332///     setter '=' identifier ':'
333///     readonly
334///     readwrite
335///     assign
336///     retain
337///     copy
338///     nonatomic
339///
340void Parser::ParseObjCPropertyAttribute(ObjCDeclSpec &DS) {
341  SourceLocation loc = ConsumeParen(); // consume '('
342  while (isObjCPropertyAttribute()) {
343    const IdentifierInfo *II = Tok.getIdentifierInfo();
344    // getter/setter require extra treatment.
345    if (II == ObjCPropertyAttrs[objc_getter] ||
346        II == ObjCPropertyAttrs[objc_setter]) {
347      // skip getter/setter part.
348      SourceLocation loc = ConsumeToken();
349      if (Tok.is(tok::equal)) {
350        loc = ConsumeToken();
351        if (Tok.is(tok::identifier)) {
352          if (II == ObjCPropertyAttrs[objc_setter]) {
353            DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_setter);
354            DS.setSetterName(Tok.getIdentifierInfo());
355            loc = ConsumeToken();  // consume method name
356            if (Tok.isNot(tok::colon)) {
357              Diag(loc, diag::err_expected_colon);
358              SkipUntil(tok::r_paren,true,true);
359              break;
360            }
361          }
362          else {
363            DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_getter);
364            DS.setGetterName(Tok.getIdentifierInfo());
365          }
366        }
367        else {
368          Diag(loc, diag::err_expected_ident);
369          SkipUntil(tok::r_paren,true,true);
370          break;
371        }
372      }
373      else {
374        Diag(loc, diag::err_objc_expected_equal);
375        SkipUntil(tok::r_paren,true,true);
376        break;
377      }
378    }
379
380    else if (II == ObjCPropertyAttrs[objc_readonly])
381      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_readonly);
382    else if (II == ObjCPropertyAttrs[objc_assign])
383      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_assign);
384    else if (II == ObjCPropertyAttrs[objc_readwrite])
385        DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_readwrite);
386    else if (II == ObjCPropertyAttrs[objc_retain])
387      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_retain);
388    else if (II == ObjCPropertyAttrs[objc_copy])
389      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_copy);
390    else if (II == ObjCPropertyAttrs[objc_nonatomic])
391      DS.setPropertyAttributes(ObjCDeclSpec::DQ_PR_nonatomic);
392
393    ConsumeToken(); // consume last attribute token
394    if (Tok.is(tok::comma)) {
395      loc = ConsumeToken();
396      continue;
397    }
398    if (Tok.is(tok::r_paren))
399      break;
400    Diag(loc, diag::err_expected_rparen);
401    SkipUntil(tok::semi);
402    return;
403  }
404  if (Tok.is(tok::r_paren))
405    ConsumeParen();
406  else {
407    Diag(loc, diag::err_objc_expected_property_attr);
408    SkipUntil(tok::r_paren); // recover from error inside attribute list
409  }
410}
411
412///   objc-method-proto:
413///     objc-instance-method objc-method-decl objc-method-attributes[opt]
414///     objc-class-method objc-method-decl objc-method-attributes[opt]
415///
416///   objc-instance-method: '-'
417///   objc-class-method: '+'
418///
419///   objc-method-attributes:         [OBJC2]
420///     __attribute__((deprecated))
421///
422Parser::DeclTy *Parser::ParseObjCMethodPrototype(DeclTy *IDecl,
423                          tok::ObjCKeywordKind MethodImplKind) {
424  assert((Tok.is(tok::minus) || Tok.is(tok::plus)) && "expected +/-");
425
426  tok::TokenKind methodType = Tok.getKind();
427  SourceLocation mLoc = ConsumeToken();
428
429  DeclTy *MDecl = ParseObjCMethodDecl(mLoc, methodType, IDecl, MethodImplKind);
430  // Since this rule is used for both method declarations and definitions,
431  // the caller is (optionally) responsible for consuming the ';'.
432  return MDecl;
433}
434
435///   objc-selector:
436///     identifier
437///     one of
438///       enum struct union if else while do for switch case default
439///       break continue return goto asm sizeof typeof __alignof
440///       unsigned long const short volatile signed restrict _Complex
441///       in out inout bycopy byref oneway int char float double void _Bool
442///
443IdentifierInfo *Parser::ParseObjCSelector(SourceLocation &SelectorLoc) {
444  switch (Tok.getKind()) {
445  default:
446    return 0;
447  case tok::identifier:
448  case tok::kw_typeof:
449  case tok::kw___alignof:
450  case tok::kw_auto:
451  case tok::kw_break:
452  case tok::kw_case:
453  case tok::kw_char:
454  case tok::kw_const:
455  case tok::kw_continue:
456  case tok::kw_default:
457  case tok::kw_do:
458  case tok::kw_double:
459  case tok::kw_else:
460  case tok::kw_enum:
461  case tok::kw_extern:
462  case tok::kw_float:
463  case tok::kw_for:
464  case tok::kw_goto:
465  case tok::kw_if:
466  case tok::kw_inline:
467  case tok::kw_int:
468  case tok::kw_long:
469  case tok::kw_register:
470  case tok::kw_restrict:
471  case tok::kw_return:
472  case tok::kw_short:
473  case tok::kw_signed:
474  case tok::kw_sizeof:
475  case tok::kw_static:
476  case tok::kw_struct:
477  case tok::kw_switch:
478  case tok::kw_typedef:
479  case tok::kw_union:
480  case tok::kw_unsigned:
481  case tok::kw_void:
482  case tok::kw_volatile:
483  case tok::kw_while:
484  case tok::kw_bool:
485  case tok::kw__Bool:
486  case tok::kw__Complex:
487    IdentifierInfo *II = Tok.getIdentifierInfo();
488    SelectorLoc = ConsumeToken();
489    return II;
490  }
491}
492
493///  property-attrlist: one of
494///    readonly getter setter assign retain copy nonatomic
495///
496bool Parser::isObjCPropertyAttribute() {
497  if (Tok.is(tok::identifier)) {
498    const IdentifierInfo *II = Tok.getIdentifierInfo();
499    for (unsigned i = 0; i < objc_NumAttrs; ++i)
500      if (II == ObjCPropertyAttrs[i]) return true;
501  }
502  return false;
503}
504
505///  objc-for-collection-in: 'in'
506///
507bool Parser::isTokIdentifier_in() const {
508  // FIXME: May have to do additional look-ahead to only allow for
509  // valid tokens following an 'in'; such as an identifier, unary operators,
510  // '[' etc.
511  return (getLang().ObjC2 && Tok.is(tok::identifier) &&
512          Tok.getIdentifierInfo() == ObjCForCollectionInKW);
513}
514
515/// ParseObjCTypeQualifierList - This routine parses the objective-c's type
516/// qualifier list and builds their bitmask representation in the input
517/// argument.
518///
519///   objc-type-qualifiers:
520///     objc-type-qualifier
521///     objc-type-qualifiers objc-type-qualifier
522///
523void Parser::ParseObjCTypeQualifierList(ObjCDeclSpec &DS) {
524  while (1) {
525    if (Tok.isNot(tok::identifier))
526      return;
527
528    const IdentifierInfo *II = Tok.getIdentifierInfo();
529    for (unsigned i = 0; i != objc_NumQuals; ++i) {
530      if (II != ObjCTypeQuals[i])
531        continue;
532
533      ObjCDeclSpec::ObjCDeclQualifier Qual;
534      switch (i) {
535      default: assert(0 && "Unknown decl qualifier");
536      case objc_in:     Qual = ObjCDeclSpec::DQ_In; break;
537      case objc_out:    Qual = ObjCDeclSpec::DQ_Out; break;
538      case objc_inout:  Qual = ObjCDeclSpec::DQ_Inout; break;
539      case objc_oneway: Qual = ObjCDeclSpec::DQ_Oneway; break;
540      case objc_bycopy: Qual = ObjCDeclSpec::DQ_Bycopy; break;
541      case objc_byref:  Qual = ObjCDeclSpec::DQ_Byref; break;
542      }
543      DS.setObjCDeclQualifier(Qual);
544      ConsumeToken();
545      II = 0;
546      break;
547    }
548
549    // If this wasn't a recognized qualifier, bail out.
550    if (II) return;
551  }
552}
553
554///   objc-type-name:
555///     '(' objc-type-qualifiers[opt] type-name ')'
556///     '(' objc-type-qualifiers[opt] ')'
557///
558Parser::TypeTy *Parser::ParseObjCTypeName(ObjCDeclSpec &DS) {
559  assert(Tok.is(tok::l_paren) && "expected (");
560
561  SourceLocation LParenLoc = ConsumeParen(), RParenLoc;
562  TypeTy *Ty = 0;
563
564  // Parse type qualifiers, in, inout, etc.
565  ParseObjCTypeQualifierList(DS);
566
567  if (isTypeSpecifierQualifier()) {
568    Ty = ParseTypeName();
569    // FIXME: back when Sema support is in place...
570    // assert(Ty && "Parser::ParseObjCTypeName(): missing type");
571  }
572  if (Tok.isNot(tok::r_paren)) {
573    MatchRHSPunctuation(tok::r_paren, LParenLoc);
574    return 0; // FIXME: decide how we want to handle this error...
575  }
576  RParenLoc = ConsumeParen();
577  return Ty;
578}
579
580///   objc-method-decl:
581///     objc-selector
582///     objc-keyword-selector objc-parmlist[opt]
583///     objc-type-name objc-selector
584///     objc-type-name objc-keyword-selector objc-parmlist[opt]
585///
586///   objc-keyword-selector:
587///     objc-keyword-decl
588///     objc-keyword-selector objc-keyword-decl
589///
590///   objc-keyword-decl:
591///     objc-selector ':' objc-type-name objc-keyword-attributes[opt] identifier
592///     objc-selector ':' objc-keyword-attributes[opt] identifier
593///     ':' objc-type-name objc-keyword-attributes[opt] identifier
594///     ':' objc-keyword-attributes[opt] identifier
595///
596///   objc-parmlist:
597///     objc-parms objc-ellipsis[opt]
598///
599///   objc-parms:
600///     objc-parms , parameter-declaration
601///
602///   objc-ellipsis:
603///     , ...
604///
605///   objc-keyword-attributes:         [OBJC2]
606///     __attribute__((unused))
607///
608Parser::DeclTy *Parser::ParseObjCMethodDecl(SourceLocation mLoc,
609                                            tok::TokenKind mType,
610                                            DeclTy *IDecl,
611                                            tok::ObjCKeywordKind MethodImplKind)
612{
613  // Parse the return type.
614  TypeTy *ReturnType = 0;
615  ObjCDeclSpec DSRet;
616  if (Tok.is(tok::l_paren))
617    ReturnType = ParseObjCTypeName(DSRet);
618  SourceLocation selLoc;
619  IdentifierInfo *SelIdent = ParseObjCSelector(selLoc);
620  if (Tok.isNot(tok::colon)) {
621    if (!SelIdent) {
622      Diag(Tok, diag::err_expected_ident); // missing selector name.
623      // FIXME: this creates a unary selector with a null identifier, is this
624      // ok??  Maybe we should skip to the next semicolon or something.
625    }
626
627    // If attributes exist after the method, parse them.
628    AttributeList *MethodAttrs = 0;
629    if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
630      MethodAttrs = ParseAttributes();
631
632    Selector Sel = PP.getSelectorTable().getNullarySelector(SelIdent);
633    return Actions.ActOnMethodDeclaration(mLoc, Tok.getLocation(),
634                                          mType, IDecl, DSRet, ReturnType, Sel,
635                                          0, 0, 0, MethodAttrs, MethodImplKind);
636  }
637
638  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
639  llvm::SmallVector<Action::TypeTy *, 12> KeyTypes;
640  llvm::SmallVector<ObjCDeclSpec, 12> ArgTypeQuals;
641  llvm::SmallVector<IdentifierInfo *, 12> ArgNames;
642
643  Action::TypeTy *TypeInfo;
644  while (1) {
645    KeyIdents.push_back(SelIdent);
646
647    // Each iteration parses a single keyword argument.
648    if (Tok.isNot(tok::colon)) {
649      Diag(Tok, diag::err_expected_colon);
650      break;
651    }
652    ConsumeToken(); // Eat the ':'.
653    ObjCDeclSpec DSType;
654    if (Tok.is(tok::l_paren))  { // Parse the argument type.
655      TypeInfo = ParseObjCTypeName(DSType);
656    }
657    else
658      TypeInfo = 0;
659    KeyTypes.push_back(TypeInfo);
660    ArgTypeQuals.push_back(DSType);
661
662    // If attributes exist before the argument name, parse them.
663    if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
664      ParseAttributes(); // FIXME: pass attributes through.
665
666    if (Tok.isNot(tok::identifier)) {
667      Diag(Tok, diag::err_expected_ident); // missing argument name.
668      break;
669    }
670    ArgNames.push_back(Tok.getIdentifierInfo());
671    ConsumeToken(); // Eat the identifier.
672
673    // Check for another keyword selector.
674    SourceLocation Loc;
675    SelIdent = ParseObjCSelector(Loc);
676    if (!SelIdent && Tok.isNot(tok::colon))
677      break;
678    // We have a selector or a colon, continue parsing.
679  }
680
681  bool isVariadic = false;
682
683  // Parse the (optional) parameter list.
684  while (Tok.is(tok::comma)) {
685    ConsumeToken();
686    if (Tok.is(tok::ellipsis)) {
687      isVariadic = true;
688      ConsumeToken();
689      break;
690    }
691    // FIXME: implement this...
692    // Parse the c-style argument declaration-specifier.
693    DeclSpec DS;
694    ParseDeclarationSpecifiers(DS);
695    // Parse the declarator.
696    Declarator ParmDecl(DS, Declarator::PrototypeContext);
697    ParseDeclarator(ParmDecl);
698  }
699
700  // FIXME: Add support for optional parmameter list...
701  // If attributes exist after the method, parse them.
702  AttributeList *MethodAttrs = 0;
703  if (getLang().ObjC2 && Tok.is(tok::kw___attribute))
704    MethodAttrs = ParseAttributes();
705
706  Selector Sel = PP.getSelectorTable().getSelector(KeyIdents.size(),
707                                                   &KeyIdents[0]);
708  return Actions.ActOnMethodDeclaration(mLoc, Tok.getLocation(),
709                                        mType, IDecl, DSRet, ReturnType, Sel,
710                                        &ArgTypeQuals[0], &KeyTypes[0],
711                                        &ArgNames[0], MethodAttrs,
712                                        MethodImplKind, isVariadic);
713}
714
715///   objc-protocol-refs:
716///     '<' identifier-list '>'
717///
718bool Parser::
719ParseObjCProtocolReferences(llvm::SmallVectorImpl<IdentifierLocPair> &Protocols,
720                            SourceLocation &endLoc) {
721  assert(Tok.is(tok::less) && "expected <");
722
723  ConsumeToken(); // the "<"
724
725  while (1) {
726    if (Tok.isNot(tok::identifier)) {
727      Diag(Tok, diag::err_expected_ident);
728      SkipUntil(tok::greater);
729      return true;
730    }
731    Protocols.push_back(std::make_pair(Tok.getIdentifierInfo(),
732                                          Tok.getLocation()));
733    ConsumeToken();
734
735    if (Tok.isNot(tok::comma))
736      break;
737    ConsumeToken();
738  }
739
740  // Consume the '>'.
741  if (Tok.is(tok::greater)) {
742    endLoc = ConsumeAnyToken();
743    return false;
744  }
745  Diag(Tok, diag::err_expected_greater);
746  return true;
747}
748
749///   objc-class-instance-variables:
750///     '{' objc-instance-variable-decl-list[opt] '}'
751///
752///   objc-instance-variable-decl-list:
753///     objc-visibility-spec
754///     objc-instance-variable-decl ';'
755///     ';'
756///     objc-instance-variable-decl-list objc-visibility-spec
757///     objc-instance-variable-decl-list objc-instance-variable-decl ';'
758///     objc-instance-variable-decl-list ';'
759///
760///   objc-visibility-spec:
761///     @private
762///     @protected
763///     @public
764///     @package [OBJC2]
765///
766///   objc-instance-variable-decl:
767///     struct-declaration
768///
769void Parser::ParseObjCClassInstanceVariables(DeclTy *interfaceDecl,
770                                             SourceLocation atLoc) {
771  assert(Tok.is(tok::l_brace) && "expected {");
772  llvm::SmallVector<DeclTy*, 32> AllIvarDecls;
773  llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
774
775  SourceLocation LBraceLoc = ConsumeBrace(); // the "{"
776
777  tok::ObjCKeywordKind visibility = tok::objc_protected;
778  // While we still have something to read, read the instance variables.
779  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
780    // Each iteration of this loop reads one objc-instance-variable-decl.
781
782    // Check for extraneous top-level semicolon.
783    if (Tok.is(tok::semi)) {
784      Diag(Tok, diag::ext_extra_struct_semi);
785      ConsumeToken();
786      continue;
787    }
788
789    // Set the default visibility to private.
790    if (Tok.is(tok::at)) { // parse objc-visibility-spec
791      ConsumeToken(); // eat the @ sign
792      switch (Tok.getObjCKeywordID()) {
793      case tok::objc_private:
794      case tok::objc_public:
795      case tok::objc_protected:
796      case tok::objc_package:
797        visibility = Tok.getObjCKeywordID();
798        ConsumeToken();
799        continue;
800      default:
801        Diag(Tok, diag::err_objc_illegal_visibility_spec);
802        continue;
803      }
804    }
805
806    // Parse all the comma separated declarators.
807    DeclSpec DS;
808    FieldDeclarators.clear();
809    ParseStructDeclaration(DS, FieldDeclarators);
810
811    // Convert them all to fields.
812    for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
813      FieldDeclarator &FD = FieldDeclarators[i];
814      // Install the declarator into interfaceDecl.
815      DeclTy *Field = Actions.ActOnIvar(CurScope,
816                                         DS.getSourceRange().getBegin(),
817                                         FD.D, FD.BitfieldSize, visibility);
818      AllIvarDecls.push_back(Field);
819    }
820
821    if (Tok.is(tok::semi)) {
822      ConsumeToken();
823    } else if (Tok.is(tok::r_brace)) {
824      Diag(Tok.getLocation(), diag::ext_expected_semi_decl_list);
825      break;
826    } else {
827      Diag(Tok, diag::err_expected_semi_decl_list);
828      // Skip to end of block or statement
829      SkipUntil(tok::r_brace, true, true);
830    }
831  }
832  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
833  // Call ActOnFields() even if we don't have any decls. This is useful
834  // for code rewriting tools that need to be aware of the empty list.
835  Actions.ActOnFields(CurScope, atLoc, interfaceDecl,
836                      &AllIvarDecls[0], AllIvarDecls.size(),
837                      LBraceLoc, RBraceLoc);
838  return;
839}
840
841///   objc-protocol-declaration:
842///     objc-protocol-definition
843///     objc-protocol-forward-reference
844///
845///   objc-protocol-definition:
846///     @protocol identifier
847///       objc-protocol-refs[opt]
848///       objc-interface-decl-list
849///     @end
850///
851///   objc-protocol-forward-reference:
852///     @protocol identifier-list ';'
853///
854///   "@protocol identifier ;" should be resolved as "@protocol
855///   identifier-list ;": objc-interface-decl-list may not start with a
856///   semicolon in the first alternative if objc-protocol-refs are omitted.
857Parser::DeclTy *Parser::ParseObjCAtProtocolDeclaration(SourceLocation AtLoc) {
858  assert(Tok.isObjCAtKeyword(tok::objc_protocol) &&
859         "ParseObjCAtProtocolDeclaration(): Expected @protocol");
860  ConsumeToken(); // the "protocol" identifier
861
862  if (Tok.isNot(tok::identifier)) {
863    Diag(Tok, diag::err_expected_ident); // missing protocol name.
864    return 0;
865  }
866  // Save the protocol name, then consume it.
867  IdentifierInfo *protocolName = Tok.getIdentifierInfo();
868  SourceLocation nameLoc = ConsumeToken();
869
870  if (Tok.is(tok::semi)) { // forward declaration of one protocol.
871    IdentifierLocPair ProtoInfo(protocolName, nameLoc);
872    ConsumeToken();
873    return Actions.ActOnForwardProtocolDeclaration(AtLoc, &ProtoInfo, 1);
874  }
875
876  if (Tok.is(tok::comma)) { // list of forward declarations.
877    llvm::SmallVector<IdentifierLocPair, 8> ProtocolRefs;
878    ProtocolRefs.push_back(std::make_pair(protocolName, nameLoc));
879
880    // Parse the list of forward declarations.
881    while (1) {
882      ConsumeToken(); // the ','
883      if (Tok.isNot(tok::identifier)) {
884        Diag(Tok, diag::err_expected_ident);
885        SkipUntil(tok::semi);
886        return 0;
887      }
888      ProtocolRefs.push_back(IdentifierLocPair(Tok.getIdentifierInfo(),
889                                               Tok.getLocation()));
890      ConsumeToken(); // the identifier
891
892      if (Tok.isNot(tok::comma))
893        break;
894    }
895    // Consume the ';'.
896    if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, "@protocol"))
897      return 0;
898
899    return Actions.ActOnForwardProtocolDeclaration(AtLoc,
900                                                   &ProtocolRefs[0],
901                                                   ProtocolRefs.size());
902  }
903
904  // Last, and definitely not least, parse a protocol declaration.
905  SourceLocation endProtoLoc;
906  llvm::SmallVector<IdentifierLocPair, 8> ProtocolRefs;
907
908  if (Tok.is(tok::less) &&
909      ParseObjCProtocolReferences(ProtocolRefs, endProtoLoc))
910    return 0;
911
912  DeclTy *ProtoType = Actions.ActOnStartProtocolInterface(AtLoc,
913                                protocolName, nameLoc,
914                                &ProtocolRefs[0],
915                                ProtocolRefs.size(), endProtoLoc);
916  ParseObjCInterfaceDeclList(ProtoType, tok::objc_protocol);
917
918  // The @ sign was already consumed by ParseObjCInterfaceDeclList().
919  if (Tok.isObjCAtKeyword(tok::objc_end)) {
920    ConsumeToken(); // the "end" identifier
921    return ProtoType;
922  }
923  Diag(Tok, diag::err_objc_missing_end);
924  return 0;
925}
926
927///   objc-implementation:
928///     objc-class-implementation-prologue
929///     objc-category-implementation-prologue
930///
931///   objc-class-implementation-prologue:
932///     @implementation identifier objc-superclass[opt]
933///       objc-class-instance-variables[opt]
934///
935///   objc-category-implementation-prologue:
936///     @implementation identifier ( identifier )
937
938Parser::DeclTy *Parser::ParseObjCAtImplementationDeclaration(
939  SourceLocation atLoc) {
940  assert(Tok.isObjCAtKeyword(tok::objc_implementation) &&
941         "ParseObjCAtImplementationDeclaration(): Expected @implementation");
942  ConsumeToken(); // the "implementation" identifier
943
944  if (Tok.isNot(tok::identifier)) {
945    Diag(Tok, diag::err_expected_ident); // missing class or category name.
946    return 0;
947  }
948  // We have a class or category name - consume it.
949  IdentifierInfo *nameId = Tok.getIdentifierInfo();
950  SourceLocation nameLoc = ConsumeToken(); // consume class or category name
951
952  if (Tok.is(tok::l_paren)) {
953    // we have a category implementation.
954    SourceLocation lparenLoc = ConsumeParen();
955    SourceLocation categoryLoc, rparenLoc;
956    IdentifierInfo *categoryId = 0;
957
958    if (Tok.is(tok::identifier)) {
959      categoryId = Tok.getIdentifierInfo();
960      categoryLoc = ConsumeToken();
961    } else {
962      Diag(Tok, diag::err_expected_ident); // missing category name.
963      return 0;
964    }
965    if (Tok.isNot(tok::r_paren)) {
966      Diag(Tok, diag::err_expected_rparen);
967      SkipUntil(tok::r_paren, false); // don't stop at ';'
968      return 0;
969    }
970    rparenLoc = ConsumeParen();
971    DeclTy *ImplCatType = Actions.ActOnStartCategoryImplementation(
972                                    atLoc, nameId, nameLoc, categoryId,
973                                    categoryLoc);
974    ObjCImpDecl = ImplCatType;
975    return 0;
976  }
977  // We have a class implementation
978  SourceLocation superClassLoc;
979  IdentifierInfo *superClassId = 0;
980  if (Tok.is(tok::colon)) {
981    // We have a super class
982    ConsumeToken();
983    if (Tok.isNot(tok::identifier)) {
984      Diag(Tok, diag::err_expected_ident); // missing super class name.
985      return 0;
986    }
987    superClassId = Tok.getIdentifierInfo();
988    superClassLoc = ConsumeToken(); // Consume super class name
989  }
990  DeclTy *ImplClsType = Actions.ActOnStartClassImplementation(
991                                  atLoc, nameId, nameLoc,
992                                  superClassId, superClassLoc);
993
994  if (Tok.is(tok::l_brace)) // we have ivars
995    ParseObjCClassInstanceVariables(ImplClsType/*FIXME*/, atLoc);
996  ObjCImpDecl = ImplClsType;
997
998  return 0;
999}
1000
1001Parser::DeclTy *Parser::ParseObjCAtEndDeclaration(SourceLocation atLoc) {
1002  assert(Tok.isObjCAtKeyword(tok::objc_end) &&
1003         "ParseObjCAtEndDeclaration(): Expected @end");
1004  ConsumeToken(); // the "end" identifier
1005  if (ObjCImpDecl)
1006    Actions.ActOnAtEnd(atLoc, ObjCImpDecl);
1007  else
1008    Diag(atLoc, diag::warn_expected_implementation); // missing @implementation
1009  return ObjCImpDecl;
1010}
1011
1012///   compatibility-alias-decl:
1013///     @compatibility_alias alias-name  class-name ';'
1014///
1015Parser::DeclTy *Parser::ParseObjCAtAliasDeclaration(SourceLocation atLoc) {
1016  assert(Tok.isObjCAtKeyword(tok::objc_compatibility_alias) &&
1017         "ParseObjCAtAliasDeclaration(): Expected @compatibility_alias");
1018  ConsumeToken(); // consume compatibility_alias
1019  if (Tok.isNot(tok::identifier)) {
1020    Diag(Tok, diag::err_expected_ident);
1021    return 0;
1022  }
1023  IdentifierInfo *aliasId = Tok.getIdentifierInfo();
1024  SourceLocation aliasLoc = ConsumeToken(); // consume alias-name
1025  if (Tok.isNot(tok::identifier)) {
1026    Diag(Tok, diag::err_expected_ident);
1027    return 0;
1028  }
1029  IdentifierInfo *classId = Tok.getIdentifierInfo();
1030  SourceLocation classLoc = ConsumeToken(); // consume class-name;
1031  if (Tok.isNot(tok::semi)) {
1032    Diag(Tok, diag::err_expected_semi_after, "@compatibility_alias");
1033    return 0;
1034  }
1035  DeclTy *ClsType = Actions.ActOnCompatiblityAlias(atLoc,
1036                                                   aliasId, aliasLoc,
1037                                                   classId, classLoc);
1038  return ClsType;
1039}
1040
1041///   property-synthesis:
1042///     @synthesize property-ivar-list ';'
1043///
1044///   property-ivar-list:
1045///     property-ivar
1046///     property-ivar-list ',' property-ivar
1047///
1048///   property-ivar:
1049///     identifier
1050///     identifier '=' identifier
1051///
1052Parser::DeclTy *Parser::ParseObjCPropertySynthesize(SourceLocation atLoc) {
1053  assert(Tok.isObjCAtKeyword(tok::objc_synthesize) &&
1054         "ParseObjCPropertyDynamic(): Expected '@synthesize'");
1055  SourceLocation loc = ConsumeToken(); // consume synthesize
1056  if (Tok.isNot(tok::identifier)) {
1057    Diag(Tok, diag::err_expected_ident);
1058    return 0;
1059  }
1060  while (Tok.is(tok::identifier)) {
1061    IdentifierInfo *propertyIvar = 0;
1062    IdentifierInfo *propertyId = Tok.getIdentifierInfo();
1063    SourceLocation propertyLoc = ConsumeToken(); // consume property name
1064    if (Tok.is(tok::equal)) {
1065      // property '=' ivar-name
1066      ConsumeToken(); // consume '='
1067      if (Tok.isNot(tok::identifier)) {
1068        Diag(Tok, diag::err_expected_ident);
1069        break;
1070      }
1071      propertyIvar = Tok.getIdentifierInfo();
1072      ConsumeToken(); // consume ivar-name
1073    }
1074    Actions.ActOnPropertyImplDecl(atLoc, propertyLoc, true, ObjCImpDecl,
1075                                  propertyId, propertyIvar);
1076    if (Tok.isNot(tok::comma))
1077      break;
1078    ConsumeToken(); // consume ','
1079  }
1080  if (Tok.isNot(tok::semi))
1081    Diag(Tok, diag::err_expected_semi_after, "@synthesize");
1082  return 0;
1083}
1084
1085///   property-dynamic:
1086///     @dynamic  property-list
1087///
1088///   property-list:
1089///     identifier
1090///     property-list ',' identifier
1091///
1092Parser::DeclTy *Parser::ParseObjCPropertyDynamic(SourceLocation atLoc) {
1093  assert(Tok.isObjCAtKeyword(tok::objc_dynamic) &&
1094         "ParseObjCPropertyDynamic(): Expected '@dynamic'");
1095  SourceLocation loc = ConsumeToken(); // consume dynamic
1096  if (Tok.isNot(tok::identifier)) {
1097    Diag(Tok, diag::err_expected_ident);
1098    return 0;
1099  }
1100  while (Tok.is(tok::identifier)) {
1101    IdentifierInfo *propertyId = Tok.getIdentifierInfo();
1102    SourceLocation propertyLoc = ConsumeToken(); // consume property name
1103    Actions.ActOnPropertyImplDecl(atLoc, propertyLoc, false, ObjCImpDecl,
1104                                  propertyId, 0);
1105
1106    if (Tok.isNot(tok::comma))
1107      break;
1108    ConsumeToken(); // consume ','
1109  }
1110  if (Tok.isNot(tok::semi))
1111    Diag(Tok, diag::err_expected_semi_after, "@dynamic");
1112  return 0;
1113}
1114
1115///  objc-throw-statement:
1116///    throw expression[opt];
1117///
1118Parser::StmtResult Parser::ParseObjCThrowStmt(SourceLocation atLoc) {
1119  ExprResult Res;
1120  ConsumeToken(); // consume throw
1121  if (Tok.isNot(tok::semi)) {
1122    Res = ParseExpression();
1123    if (Res.isInvalid) {
1124      SkipUntil(tok::semi);
1125      return true;
1126    }
1127  }
1128  ConsumeToken(); // consume ';'
1129  return Actions.ActOnObjCAtThrowStmt(atLoc, Res.Val);
1130}
1131
1132/// objc-synchronized-statement:
1133///   @synchronized '(' expression ')' compound-statement
1134///
1135Parser::StmtResult Parser::ParseObjCSynchronizedStmt(SourceLocation atLoc) {
1136  ConsumeToken(); // consume synchronized
1137  if (Tok.isNot(tok::l_paren)) {
1138    Diag (Tok, diag::err_expected_lparen_after, "@synchronized");
1139    return true;
1140  }
1141  ConsumeParen();  // '('
1142  ExprResult Res = ParseExpression();
1143  if (Res.isInvalid) {
1144    SkipUntil(tok::semi);
1145    return true;
1146  }
1147  if (Tok.isNot(tok::r_paren)) {
1148    Diag (Tok, diag::err_expected_lbrace);
1149    return true;
1150  }
1151  ConsumeParen();  // ')'
1152  if (Tok.isNot(tok::l_brace)) {
1153    Diag (Tok, diag::err_expected_lbrace);
1154    return true;
1155  }
1156  // Enter a scope to hold everything within the compound stmt.  Compound
1157  // statements can always hold declarations.
1158  EnterScope(Scope::DeclScope);
1159
1160  StmtResult SynchBody = ParseCompoundStatementBody();
1161
1162  ExitScope();
1163  if (SynchBody.isInvalid)
1164    SynchBody = Actions.ActOnNullStmt(Tok.getLocation());
1165  return Actions.ActOnObjCAtSynchronizedStmt(atLoc, Res.Val, SynchBody.Val);
1166}
1167
1168///  objc-try-catch-statement:
1169///    @try compound-statement objc-catch-list[opt]
1170///    @try compound-statement objc-catch-list[opt] @finally compound-statement
1171///
1172///  objc-catch-list:
1173///    @catch ( parameter-declaration ) compound-statement
1174///    objc-catch-list @catch ( catch-parameter-declaration ) compound-statement
1175///  catch-parameter-declaration:
1176///     parameter-declaration
1177///     '...' [OBJC2]
1178///
1179Parser::StmtResult Parser::ParseObjCTryStmt(SourceLocation atLoc) {
1180  bool catch_or_finally_seen = false;
1181
1182  ConsumeToken(); // consume try
1183  if (Tok.isNot(tok::l_brace)) {
1184    Diag (Tok, diag::err_expected_lbrace);
1185    return true;
1186  }
1187  StmtResult CatchStmts;
1188  StmtResult FinallyStmt;
1189  StmtResult TryBody = ParseCompoundStatementBody();
1190  if (TryBody.isInvalid)
1191    TryBody = Actions.ActOnNullStmt(Tok.getLocation());
1192
1193  while (Tok.is(tok::at)) {
1194    // At this point, we need to lookahead to determine if this @ is the start
1195    // of an @catch or @finally.  We don't want to consume the @ token if this
1196    // is an @try or @encode or something else.
1197    Token AfterAt = GetLookAheadToken(1);
1198    if (!AfterAt.isObjCAtKeyword(tok::objc_catch) &&
1199        !AfterAt.isObjCAtKeyword(tok::objc_finally))
1200      break;
1201
1202    SourceLocation AtCatchFinallyLoc = ConsumeToken();
1203    if (Tok.isObjCAtKeyword(tok::objc_catch)) {
1204      StmtTy *FirstPart = 0;
1205      ConsumeToken(); // consume catch
1206      if (Tok.is(tok::l_paren)) {
1207        ConsumeParen();
1208        EnterScope(Scope::DeclScope);
1209        if (Tok.isNot(tok::ellipsis)) {
1210          DeclSpec DS;
1211          ParseDeclarationSpecifiers(DS);
1212          // For some odd reason, the name of the exception variable is
1213          // optional. As a result, we need to use PrototypeContext.
1214          Declarator DeclaratorInfo(DS, Declarator::PrototypeContext);
1215          ParseDeclarator(DeclaratorInfo);
1216          if (DeclaratorInfo.getIdentifier()) {
1217            DeclTy *aBlockVarDecl = Actions.ActOnDeclarator(CurScope,
1218                                                          DeclaratorInfo, 0);
1219            StmtResult stmtResult =
1220              Actions.ActOnDeclStmt(aBlockVarDecl,
1221                                    DS.getSourceRange().getBegin(),
1222                                    DeclaratorInfo.getSourceRange().getEnd());
1223            FirstPart = stmtResult.isInvalid ? 0 : stmtResult.Val;
1224          }
1225        } else
1226          ConsumeToken(); // consume '...'
1227        SourceLocation RParenLoc = ConsumeParen();
1228
1229        StmtResult CatchBody(true);
1230        if (Tok.is(tok::l_brace))
1231          CatchBody = ParseCompoundStatementBody();
1232        else
1233          Diag(Tok, diag::err_expected_lbrace);
1234        if (CatchBody.isInvalid)
1235          CatchBody = Actions.ActOnNullStmt(Tok.getLocation());
1236        CatchStmts = Actions.ActOnObjCAtCatchStmt(AtCatchFinallyLoc, RParenLoc,
1237          FirstPart, CatchBody.Val, CatchStmts.Val);
1238        ExitScope();
1239      } else {
1240        Diag(AtCatchFinallyLoc, diag::err_expected_lparen_after,
1241             "@catch clause");
1242        return true;
1243      }
1244      catch_or_finally_seen = true;
1245    } else {
1246      assert(Tok.isObjCAtKeyword(tok::objc_finally) && "Lookahead confused?");
1247      ConsumeToken(); // consume finally
1248
1249      StmtResult FinallyBody(true);
1250      if (Tok.is(tok::l_brace))
1251        FinallyBody = ParseCompoundStatementBody();
1252      else
1253        Diag(Tok, diag::err_expected_lbrace);
1254      if (FinallyBody.isInvalid)
1255        FinallyBody = Actions.ActOnNullStmt(Tok.getLocation());
1256      FinallyStmt = Actions.ActOnObjCAtFinallyStmt(AtCatchFinallyLoc,
1257                                                   FinallyBody.Val);
1258      catch_or_finally_seen = true;
1259      break;
1260    }
1261  }
1262  if (!catch_or_finally_seen) {
1263    Diag(atLoc, diag::err_missing_catch_finally);
1264    return true;
1265  }
1266  return Actions.ActOnObjCAtTryStmt(atLoc, TryBody.Val, CatchStmts.Val,
1267                                    FinallyStmt.Val);
1268}
1269
1270///   objc-method-def: objc-method-proto ';'[opt] '{' body '}'
1271///
1272Parser::DeclTy *Parser::ParseObjCMethodDefinition() {
1273  DeclTy *MDecl = ParseObjCMethodPrototype(ObjCImpDecl);
1274  // parse optional ';'
1275  if (Tok.is(tok::semi))
1276    ConsumeToken();
1277
1278  // We should have an opening brace now.
1279  if (Tok.isNot(tok::l_brace)) {
1280    Diag(Tok, diag::err_expected_method_body);
1281
1282    // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1283    SkipUntil(tok::l_brace, true, true);
1284
1285    // If we didn't find the '{', bail out.
1286    if (Tok.isNot(tok::l_brace))
1287      return 0;
1288  }
1289  SourceLocation BraceLoc = Tok.getLocation();
1290
1291  // Enter a scope for the method body.
1292  EnterScope(Scope::FnScope|Scope::DeclScope);
1293
1294  // Tell the actions module that we have entered a method definition with the
1295  // specified Declarator for the method. If we don't have an MDecl, avoid
1296  // calling the actions module.
1297  if (MDecl)
1298    Actions.ObjCActOnStartOfMethodDef(CurScope, MDecl);
1299
1300  StmtResult FnBody = ParseCompoundStatementBody();
1301
1302  // If the function body could not be parsed, make a bogus compoundstmt.
1303  if (FnBody.isInvalid)
1304    FnBody = Actions.ActOnCompoundStmt(BraceLoc, BraceLoc, 0, 0, false);
1305
1306  // Leave the function body scope.
1307  ExitScope();
1308
1309  // TODO: Pass argument information.
1310  if (MDecl)
1311    Actions.ActOnFinishFunctionBody(MDecl, FnBody.Val);
1312  return MDecl;
1313}
1314
1315Parser::StmtResult Parser::ParseObjCAtStatement(SourceLocation AtLoc) {
1316  if (Tok.isObjCAtKeyword(tok::objc_try)) {
1317    return ParseObjCTryStmt(AtLoc);
1318  } else if (Tok.isObjCAtKeyword(tok::objc_throw))
1319    return ParseObjCThrowStmt(AtLoc);
1320  else if (Tok.isObjCAtKeyword(tok::objc_synchronized))
1321    return ParseObjCSynchronizedStmt(AtLoc);
1322  ExprResult Res = ParseExpressionWithLeadingAt(AtLoc);
1323  if (Res.isInvalid) {
1324    // If the expression is invalid, skip ahead to the next semicolon. Not
1325    // doing this opens us up to the possibility of infinite loops if
1326    // ParseExpression does not consume any tokens.
1327    SkipUntil(tok::semi);
1328    return true;
1329  }
1330  // Otherwise, eat the semicolon.
1331  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr);
1332  return Actions.ActOnExprStmt(Res.Val);
1333}
1334
1335Parser::ExprResult Parser::ParseObjCAtExpression(SourceLocation AtLoc) {
1336
1337  switch (Tok.getKind()) {
1338  case tok::string_literal:    // primary-expression: string-literal
1339  case tok::wide_string_literal:
1340    return ParsePostfixExpressionSuffix(ParseObjCStringLiteral(AtLoc));
1341  default:
1342    break;
1343  }
1344
1345  switch (Tok.getIdentifierInfo()->getObjCKeywordID()) {
1346  case tok::objc_encode:
1347    return ParsePostfixExpressionSuffix(ParseObjCEncodeExpression(AtLoc));
1348  case tok::objc_protocol:
1349    return ParsePostfixExpressionSuffix(ParseObjCProtocolExpression(AtLoc));
1350  case tok::objc_selector:
1351    return ParsePostfixExpressionSuffix(ParseObjCSelectorExpression(AtLoc));
1352  default:
1353    Diag(AtLoc, diag::err_unexpected_at);
1354    SkipUntil(tok::semi);
1355    return true;
1356  }
1357}
1358
1359///   objc-message-expr:
1360///     '[' objc-receiver objc-message-args ']'
1361///
1362///   objc-receiver:
1363///     expression
1364///     class-name
1365///     type-name
1366Parser::ExprResult Parser::ParseObjCMessageExpression() {
1367  assert(Tok.is(tok::l_square) && "'[' expected");
1368  SourceLocation LBracLoc = ConsumeBracket(); // consume '['
1369
1370  // Parse receiver
1371  if (isTokObjCMessageIdentifierReceiver()) {
1372    IdentifierInfo *ReceiverName = Tok.getIdentifierInfo();
1373    ConsumeToken();
1374    return ParseObjCMessageExpressionBody(LBracLoc, ReceiverName, 0);
1375  }
1376
1377  ExprResult Res = ParseAssignmentExpression();
1378  if (Res.isInvalid) {
1379    Diag(Tok, diag::err_invalid_receiver_to_message);
1380    SkipUntil(tok::r_square);
1381    return Res;
1382  }
1383  return ParseObjCMessageExpressionBody(LBracLoc, 0, Res.Val);
1384}
1385
1386/// ParseObjCMessageExpressionBody - Having parsed "'[' objc-receiver", parse
1387/// the rest of a message expression.
1388///
1389///   objc-message-args:
1390///     objc-selector
1391///     objc-keywordarg-list
1392///
1393///   objc-keywordarg-list:
1394///     objc-keywordarg
1395///     objc-keywordarg-list objc-keywordarg
1396///
1397///   objc-keywordarg:
1398///     selector-name[opt] ':' objc-keywordexpr
1399///
1400///   objc-keywordexpr:
1401///     nonempty-expr-list
1402///
1403///   nonempty-expr-list:
1404///     assignment-expression
1405///     nonempty-expr-list , assignment-expression
1406///
1407Parser::ExprResult
1408Parser::ParseObjCMessageExpressionBody(SourceLocation LBracLoc,
1409                                       IdentifierInfo *ReceiverName,
1410                                       ExprTy *ReceiverExpr) {
1411  // Parse objc-selector
1412  SourceLocation Loc;
1413  IdentifierInfo *selIdent = ParseObjCSelector(Loc);
1414
1415  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
1416  llvm::SmallVector<Action::ExprTy *, 12> KeyExprs;
1417
1418  if (Tok.is(tok::colon)) {
1419    while (1) {
1420      // Each iteration parses a single keyword argument.
1421      KeyIdents.push_back(selIdent);
1422
1423      if (Tok.isNot(tok::colon)) {
1424        Diag(Tok, diag::err_expected_colon);
1425        SkipUntil(tok::semi);
1426        return true;
1427      }
1428      ConsumeToken(); // Eat the ':'.
1429      ///  Parse the expression after ':'
1430      ExprResult Res = ParseAssignmentExpression();
1431      if (Res.isInvalid) {
1432        SkipUntil(tok::identifier);
1433        return Res;
1434      }
1435      // We have a valid expression.
1436      KeyExprs.push_back(Res.Val);
1437
1438      // Check for another keyword selector.
1439      selIdent = ParseObjCSelector(Loc);
1440      if (!selIdent && Tok.isNot(tok::colon))
1441        break;
1442      // We have a selector or a colon, continue parsing.
1443    }
1444    // Parse the, optional, argument list, comma separated.
1445    while (Tok.is(tok::comma)) {
1446      ConsumeToken(); // Eat the ','.
1447      ///  Parse the expression after ','
1448      ExprResult Res = ParseAssignmentExpression();
1449      if (Res.isInvalid) {
1450        SkipUntil(tok::identifier);
1451        return Res;
1452      }
1453      // We have a valid expression.
1454      KeyExprs.push_back(Res.Val);
1455    }
1456  } else if (!selIdent) {
1457    Diag(Tok, diag::err_expected_ident); // missing selector name.
1458    SkipUntil(tok::semi);
1459    return true;
1460  }
1461
1462  if (Tok.isNot(tok::r_square)) {
1463    Diag(Tok, diag::err_expected_rsquare);
1464    SkipUntil(tok::semi);
1465    return true;
1466  }
1467  SourceLocation RBracLoc = ConsumeBracket(); // consume ']'
1468
1469  unsigned nKeys = KeyIdents.size();
1470  if (nKeys == 0)
1471    KeyIdents.push_back(selIdent);
1472  Selector Sel = PP.getSelectorTable().getSelector(nKeys, &KeyIdents[0]);
1473
1474  // We've just parsed a keyword message.
1475  if (ReceiverName)
1476    return Actions.ActOnClassMessage(CurScope,
1477                                     ReceiverName, Sel, LBracLoc, RBracLoc,
1478                                     &KeyExprs[0], KeyExprs.size());
1479  return Actions.ActOnInstanceMessage(ReceiverExpr, Sel, LBracLoc, RBracLoc,
1480                                      &KeyExprs[0], KeyExprs.size());
1481}
1482
1483Parser::ExprResult Parser::ParseObjCStringLiteral(SourceLocation AtLoc) {
1484  ExprResult Res = ParseStringLiteralExpression();
1485  if (Res.isInvalid) return Res;
1486
1487  // @"foo" @"bar" is a valid concatenated string.  Eat any subsequent string
1488  // expressions.  At this point, we know that the only valid thing that starts
1489  // with '@' is an @"".
1490  llvm::SmallVector<SourceLocation, 4> AtLocs;
1491  llvm::SmallVector<ExprTy*, 4> AtStrings;
1492  AtLocs.push_back(AtLoc);
1493  AtStrings.push_back(Res.Val);
1494
1495  while (Tok.is(tok::at)) {
1496    AtLocs.push_back(ConsumeToken()); // eat the @.
1497
1498    ExprResult Res(true);  // Invalid unless there is a string literal.
1499    if (isTokenStringLiteral())
1500      Res = ParseStringLiteralExpression();
1501    else
1502      Diag(Tok, diag::err_objc_concat_string);
1503
1504    if (Res.isInvalid) {
1505      while (!AtStrings.empty()) {
1506        Actions.DeleteExpr(AtStrings.back());
1507        AtStrings.pop_back();
1508      }
1509      return Res;
1510    }
1511
1512    AtStrings.push_back(Res.Val);
1513  }
1514
1515  return Actions.ParseObjCStringLiteral(&AtLocs[0], &AtStrings[0],
1516                                        AtStrings.size());
1517}
1518
1519///    objc-encode-expression:
1520///      @encode ( type-name )
1521Parser::ExprResult Parser::ParseObjCEncodeExpression(SourceLocation AtLoc) {
1522  assert(Tok.isObjCAtKeyword(tok::objc_encode) && "Not an @encode expression!");
1523
1524  SourceLocation EncLoc = ConsumeToken();
1525
1526  if (Tok.isNot(tok::l_paren)) {
1527    Diag(Tok, diag::err_expected_lparen_after, "@encode");
1528    return true;
1529  }
1530
1531  SourceLocation LParenLoc = ConsumeParen();
1532
1533  TypeTy *Ty = ParseTypeName();
1534
1535  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1536
1537  return Actions.ParseObjCEncodeExpression(AtLoc, EncLoc, LParenLoc, Ty,
1538                                           RParenLoc);
1539}
1540
1541///     objc-protocol-expression
1542///       @protocol ( protocol-name )
1543
1544Parser::ExprResult Parser::ParseObjCProtocolExpression(SourceLocation AtLoc)
1545{
1546  SourceLocation ProtoLoc = ConsumeToken();
1547
1548  if (Tok.isNot(tok::l_paren)) {
1549    Diag(Tok, diag::err_expected_lparen_after, "@protocol");
1550    return true;
1551  }
1552
1553  SourceLocation LParenLoc = ConsumeParen();
1554
1555  if (Tok.isNot(tok::identifier)) {
1556    Diag(Tok, diag::err_expected_ident);
1557    return true;
1558  }
1559  IdentifierInfo *protocolId = Tok.getIdentifierInfo();
1560  ConsumeToken();
1561
1562  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1563
1564  return Actions.ParseObjCProtocolExpression(protocolId, AtLoc, ProtoLoc,
1565                                             LParenLoc, RParenLoc);
1566}
1567
1568///     objc-selector-expression
1569///       @selector '(' objc-keyword-selector ')'
1570Parser::ExprResult Parser::ParseObjCSelectorExpression(SourceLocation AtLoc)
1571{
1572  SourceLocation SelectorLoc = ConsumeToken();
1573
1574  if (Tok.isNot(tok::l_paren)) {
1575    Diag(Tok, diag::err_expected_lparen_after, "@selector");
1576    return 0;
1577  }
1578
1579  llvm::SmallVector<IdentifierInfo *, 12> KeyIdents;
1580  SourceLocation LParenLoc = ConsumeParen();
1581  SourceLocation sLoc;
1582  IdentifierInfo *SelIdent = ParseObjCSelector(sLoc);
1583  if (!SelIdent && Tok.isNot(tok::colon)) {
1584    Diag(Tok, diag::err_expected_ident); // missing selector name.
1585    return 0;
1586  }
1587  KeyIdents.push_back(SelIdent);
1588  unsigned nColons = 0;
1589  if (Tok.isNot(tok::r_paren)) {
1590    while (1) {
1591      if (Tok.isNot(tok::colon)) {
1592        Diag(Tok, diag::err_expected_colon);
1593        break;
1594      }
1595      nColons++;
1596      ConsumeToken(); // Eat the ':'.
1597      if (Tok.is(tok::r_paren))
1598        break;
1599      // Check for another keyword selector.
1600      SourceLocation Loc;
1601      SelIdent = ParseObjCSelector(Loc);
1602      KeyIdents.push_back(SelIdent);
1603      if (!SelIdent && Tok.isNot(tok::colon))
1604        break;
1605    }
1606  }
1607  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1608  Selector Sel = PP.getSelectorTable().getSelector(nColons, &KeyIdents[0]);
1609  return Actions.ParseObjCSelectorExpression(Sel, AtLoc, SelectorLoc, LParenLoc,
1610                                             RParenLoc);
1611 }
1612