1 //===--- CommentSema.cpp - Doxygen comment semantic analysis --------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/AST/CommentSema.h"
11 #include "clang/AST/Attr.h"
12 #include "clang/AST/CommentCommandTraits.h"
13 #include "clang/AST/CommentDiagnostic.h"
14 #include "clang/AST/Decl.h"
15 #include "clang/AST/DeclTemplate.h"
16 #include "clang/Basic/SourceManager.h"
17 #include "clang/Lex/Preprocessor.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/StringSwitch.h"
20 
21 namespace clang {
22 namespace comments {
23 
24 namespace {
25 #include "clang/AST/CommentHTMLTagsProperties.inc"
26 } // unnamed namespace
27 
28 Sema::Sema(llvm::BumpPtrAllocator &Allocator, const SourceManager &SourceMgr,
29            DiagnosticsEngine &Diags, CommandTraits &Traits,
30            const Preprocessor *PP) :
31     Allocator(Allocator), SourceMgr(SourceMgr), Diags(Diags), Traits(Traits),
32     PP(PP), ThisDeclInfo(NULL), BriefCommand(NULL), HeaderfileCommand(NULL) {
33 }
34 
35 void Sema::setDecl(const Decl *D) {
36   if (!D)
37     return;
38 
39   ThisDeclInfo = new (Allocator) DeclInfo;
40   ThisDeclInfo->CommentDecl = D;
41   ThisDeclInfo->IsFilled = false;
42 }
43 
44 ParagraphComment *Sema::actOnParagraphComment(
45                               ArrayRef<InlineContentComment *> Content) {
46   return new (Allocator) ParagraphComment(Content);
47 }
48 
49 BlockCommandComment *Sema::actOnBlockCommandStart(
50                                       SourceLocation LocBegin,
51                                       SourceLocation LocEnd,
52                                       unsigned CommandID,
53                                       CommandMarkerKind CommandMarker) {
54   BlockCommandComment *BC = new (Allocator) BlockCommandComment(LocBegin, LocEnd,
55                                                                 CommandID,
56                                                                 CommandMarker);
57   checkContainerDecl(BC);
58   return BC;
59 }
60 
61 void Sema::actOnBlockCommandArgs(BlockCommandComment *Command,
62                                  ArrayRef<BlockCommandComment::Argument> Args) {
63   Command->setArgs(Args);
64 }
65 
66 void Sema::actOnBlockCommandFinish(BlockCommandComment *Command,
67                                    ParagraphComment *Paragraph) {
68   Command->setParagraph(Paragraph);
69   checkBlockCommandEmptyParagraph(Command);
70   checkBlockCommandDuplicate(Command);
71   if (ThisDeclInfo) {
72     // These checks only make sense if the comment is attached to a
73     // declaration.
74     checkReturnsCommand(Command);
75     checkDeprecatedCommand(Command);
76   }
77 }
78 
79 ParamCommandComment *Sema::actOnParamCommandStart(
80                                       SourceLocation LocBegin,
81                                       SourceLocation LocEnd,
82                                       unsigned CommandID,
83                                       CommandMarkerKind CommandMarker) {
84   ParamCommandComment *Command =
85       new (Allocator) ParamCommandComment(LocBegin, LocEnd, CommandID,
86                                           CommandMarker);
87 
88   if (!isFunctionDecl())
89     Diag(Command->getLocation(),
90          diag::warn_doc_param_not_attached_to_a_function_decl)
91       << CommandMarker
92       << Command->getCommandNameRange(Traits);
93 
94   return Command;
95 }
96 
97 void Sema::checkFunctionDeclVerbatimLine(const BlockCommandComment *Comment) {
98   const CommandInfo *Info = Traits.getCommandInfo(Comment->getCommandID());
99   if (!Info->IsFunctionDeclarationCommand)
100     return;
101 
102   unsigned DiagSelect;
103   switch (Comment->getCommandID()) {
104     case CommandTraits::KCI_function:
105       DiagSelect = (!isAnyFunctionDecl() && !isFunctionTemplateDecl())? 1 : 0;
106       break;
107     case CommandTraits::KCI_functiongroup:
108       DiagSelect = (!isAnyFunctionDecl() && !isFunctionTemplateDecl())? 2 : 0;
109       break;
110     case CommandTraits::KCI_method:
111       DiagSelect = !isObjCMethodDecl() ? 3 : 0;
112       break;
113     case CommandTraits::KCI_methodgroup:
114       DiagSelect = !isObjCMethodDecl() ? 4 : 0;
115       break;
116     case CommandTraits::KCI_callback:
117       DiagSelect = !isFunctionPointerVarDecl() ? 5 : 0;
118       break;
119     default:
120       DiagSelect = 0;
121       break;
122   }
123   if (DiagSelect)
124     Diag(Comment->getLocation(), diag::warn_doc_function_method_decl_mismatch)
125     << Comment->getCommandMarker()
126     << (DiagSelect-1) << (DiagSelect-1)
127     << Comment->getSourceRange();
128 }
129 
130 void Sema::checkContainerDeclVerbatimLine(const BlockCommandComment *Comment) {
131   const CommandInfo *Info = Traits.getCommandInfo(Comment->getCommandID());
132   if (!Info->IsRecordLikeDeclarationCommand)
133     return;
134   unsigned DiagSelect;
135   switch (Comment->getCommandID()) {
136     case CommandTraits::KCI_class:
137       DiagSelect = (!isClassOrStructDecl() && !isClassTemplateDecl()) ? 1 : 0;
138       // Allow @class command on @interface declarations.
139       // FIXME. Currently, \class and @class are indistinguishable. So,
140       // \class is also allowed on an @interface declaration
141       if (DiagSelect && Comment->getCommandMarker() && isObjCInterfaceDecl())
142         DiagSelect = 0;
143       break;
144     case CommandTraits::KCI_interface:
145       DiagSelect = !isObjCInterfaceDecl() ? 2 : 0;
146       break;
147     case CommandTraits::KCI_protocol:
148       DiagSelect = !isObjCProtocolDecl() ? 3 : 0;
149       break;
150     case CommandTraits::KCI_struct:
151       DiagSelect = !isClassOrStructDecl() ? 4 : 0;
152       break;
153     case CommandTraits::KCI_union:
154       DiagSelect = !isUnionDecl() ? 5 : 0;
155       break;
156     default:
157       DiagSelect = 0;
158       break;
159   }
160   if (DiagSelect)
161     Diag(Comment->getLocation(), diag::warn_doc_api_container_decl_mismatch)
162     << Comment->getCommandMarker()
163     << (DiagSelect-1) << (DiagSelect-1)
164     << Comment->getSourceRange();
165 }
166 
167 void Sema::checkContainerDecl(const BlockCommandComment *Comment) {
168   const CommandInfo *Info = Traits.getCommandInfo(Comment->getCommandID());
169   if (!Info->IsRecordLikeDetailCommand || isRecordLikeDecl())
170     return;
171   unsigned DiagSelect;
172   switch (Comment->getCommandID()) {
173     case CommandTraits::KCI_classdesign:
174       DiagSelect = 1;
175       break;
176     case CommandTraits::KCI_coclass:
177       DiagSelect = 2;
178       break;
179     case CommandTraits::KCI_dependency:
180       DiagSelect = 3;
181       break;
182     case CommandTraits::KCI_helper:
183       DiagSelect = 4;
184       break;
185     case CommandTraits::KCI_helperclass:
186       DiagSelect = 5;
187       break;
188     case CommandTraits::KCI_helps:
189       DiagSelect = 6;
190       break;
191     case CommandTraits::KCI_instancesize:
192       DiagSelect = 7;
193       break;
194     case CommandTraits::KCI_ownership:
195       DiagSelect = 8;
196       break;
197     case CommandTraits::KCI_performance:
198       DiagSelect = 9;
199       break;
200     case CommandTraits::KCI_security:
201       DiagSelect = 10;
202       break;
203     case CommandTraits::KCI_superclass:
204       DiagSelect = 11;
205       break;
206     default:
207       DiagSelect = 0;
208       break;
209   }
210   if (DiagSelect)
211     Diag(Comment->getLocation(), diag::warn_doc_container_decl_mismatch)
212     << Comment->getCommandMarker()
213     << (DiagSelect-1)
214     << Comment->getSourceRange();
215 }
216 
217 /// \brief Turn a string into the corresponding PassDirection or -1 if it's not
218 /// valid.
219 static int getParamPassDirection(StringRef Arg) {
220   return llvm::StringSwitch<int>(Arg)
221       .Case("[in]", ParamCommandComment::In)
222       .Case("[out]", ParamCommandComment::Out)
223       .Cases("[in,out]", "[out,in]", ParamCommandComment::InOut)
224       .Default(-1);
225 }
226 
227 void Sema::actOnParamCommandDirectionArg(ParamCommandComment *Command,
228                                          SourceLocation ArgLocBegin,
229                                          SourceLocation ArgLocEnd,
230                                          StringRef Arg) {
231   std::string ArgLower = Arg.lower();
232   int Direction = getParamPassDirection(ArgLower);
233 
234   if (Direction == -1) {
235     // Try again with whitespace removed.
236     ArgLower.erase(
237         std::remove_if(ArgLower.begin(), ArgLower.end(), clang::isWhitespace),
238         ArgLower.end());
239     Direction = getParamPassDirection(ArgLower);
240 
241     SourceRange ArgRange(ArgLocBegin, ArgLocEnd);
242     if (Direction != -1) {
243       const char *FixedName = ParamCommandComment::getDirectionAsString(
244           (ParamCommandComment::PassDirection)Direction);
245       Diag(ArgLocBegin, diag::warn_doc_param_spaces_in_direction)
246           << ArgRange << FixItHint::CreateReplacement(ArgRange, FixedName);
247     } else {
248       Diag(ArgLocBegin, diag::warn_doc_param_invalid_direction) << ArgRange;
249       Direction = ParamCommandComment::In; // Sane fall back.
250     }
251   }
252   Command->setDirection((ParamCommandComment::PassDirection)Direction,
253                         /*Explicit=*/true);
254 }
255 
256 void Sema::actOnParamCommandParamNameArg(ParamCommandComment *Command,
257                                          SourceLocation ArgLocBegin,
258                                          SourceLocation ArgLocEnd,
259                                          StringRef Arg) {
260   // Parser will not feed us more arguments than needed.
261   assert(Command->getNumArgs() == 0);
262 
263   if (!Command->isDirectionExplicit()) {
264     // User didn't provide a direction argument.
265     Command->setDirection(ParamCommandComment::In, /* Explicit = */ false);
266   }
267   typedef BlockCommandComment::Argument Argument;
268   Argument *A = new (Allocator) Argument(SourceRange(ArgLocBegin,
269                                                      ArgLocEnd),
270                                          Arg);
271   Command->setArgs(llvm::makeArrayRef(A, 1));
272 }
273 
274 void Sema::actOnParamCommandFinish(ParamCommandComment *Command,
275                                    ParagraphComment *Paragraph) {
276   Command->setParagraph(Paragraph);
277   checkBlockCommandEmptyParagraph(Command);
278 }
279 
280 TParamCommandComment *Sema::actOnTParamCommandStart(
281                                       SourceLocation LocBegin,
282                                       SourceLocation LocEnd,
283                                       unsigned CommandID,
284                                       CommandMarkerKind CommandMarker) {
285   TParamCommandComment *Command =
286       new (Allocator) TParamCommandComment(LocBegin, LocEnd, CommandID,
287                                            CommandMarker);
288 
289   if (!isTemplateOrSpecialization())
290     Diag(Command->getLocation(),
291          diag::warn_doc_tparam_not_attached_to_a_template_decl)
292       << CommandMarker
293       << Command->getCommandNameRange(Traits);
294 
295   return Command;
296 }
297 
298 void Sema::actOnTParamCommandParamNameArg(TParamCommandComment *Command,
299                                           SourceLocation ArgLocBegin,
300                                           SourceLocation ArgLocEnd,
301                                           StringRef Arg) {
302   // Parser will not feed us more arguments than needed.
303   assert(Command->getNumArgs() == 0);
304 
305   typedef BlockCommandComment::Argument Argument;
306   Argument *A = new (Allocator) Argument(SourceRange(ArgLocBegin,
307                                                      ArgLocEnd),
308                                          Arg);
309   Command->setArgs(llvm::makeArrayRef(A, 1));
310 
311   if (!isTemplateOrSpecialization()) {
312     // We already warned that this \\tparam is not attached to a template decl.
313     return;
314   }
315 
316   const TemplateParameterList *TemplateParameters =
317       ThisDeclInfo->TemplateParameters;
318   SmallVector<unsigned, 2> Position;
319   if (resolveTParamReference(Arg, TemplateParameters, &Position)) {
320     Command->setPosition(copyArray(llvm::makeArrayRef(Position)));
321     TParamCommandComment *&PrevCommand = TemplateParameterDocs[Arg];
322     if (PrevCommand) {
323       SourceRange ArgRange(ArgLocBegin, ArgLocEnd);
324       Diag(ArgLocBegin, diag::warn_doc_tparam_duplicate)
325         << Arg << ArgRange;
326       Diag(PrevCommand->getLocation(), diag::note_doc_tparam_previous)
327         << PrevCommand->getParamNameRange();
328     }
329     PrevCommand = Command;
330     return;
331   }
332 
333   SourceRange ArgRange(ArgLocBegin, ArgLocEnd);
334   Diag(ArgLocBegin, diag::warn_doc_tparam_not_found)
335     << Arg << ArgRange;
336 
337   if (!TemplateParameters || TemplateParameters->size() == 0)
338     return;
339 
340   StringRef CorrectedName;
341   if (TemplateParameters->size() == 1) {
342     const NamedDecl *Param = TemplateParameters->getParam(0);
343     const IdentifierInfo *II = Param->getIdentifier();
344     if (II)
345       CorrectedName = II->getName();
346   } else {
347     CorrectedName = correctTypoInTParamReference(Arg, TemplateParameters);
348   }
349 
350   if (!CorrectedName.empty()) {
351     Diag(ArgLocBegin, diag::note_doc_tparam_name_suggestion)
352       << CorrectedName
353       << FixItHint::CreateReplacement(ArgRange, CorrectedName);
354   }
355 
356   return;
357 }
358 
359 void Sema::actOnTParamCommandFinish(TParamCommandComment *Command,
360                                     ParagraphComment *Paragraph) {
361   Command->setParagraph(Paragraph);
362   checkBlockCommandEmptyParagraph(Command);
363 }
364 
365 InlineCommandComment *Sema::actOnInlineCommand(SourceLocation CommandLocBegin,
366                                                SourceLocation CommandLocEnd,
367                                                unsigned CommandID) {
368   ArrayRef<InlineCommandComment::Argument> Args;
369   StringRef CommandName = Traits.getCommandInfo(CommandID)->Name;
370   return new (Allocator) InlineCommandComment(
371                                   CommandLocBegin,
372                                   CommandLocEnd,
373                                   CommandID,
374                                   getInlineCommandRenderKind(CommandName),
375                                   Args);
376 }
377 
378 InlineCommandComment *Sema::actOnInlineCommand(SourceLocation CommandLocBegin,
379                                                SourceLocation CommandLocEnd,
380                                                unsigned CommandID,
381                                                SourceLocation ArgLocBegin,
382                                                SourceLocation ArgLocEnd,
383                                                StringRef Arg) {
384   typedef InlineCommandComment::Argument Argument;
385   Argument *A = new (Allocator) Argument(SourceRange(ArgLocBegin,
386                                                      ArgLocEnd),
387                                          Arg);
388   StringRef CommandName = Traits.getCommandInfo(CommandID)->Name;
389 
390   return new (Allocator) InlineCommandComment(
391                                   CommandLocBegin,
392                                   CommandLocEnd,
393                                   CommandID,
394                                   getInlineCommandRenderKind(CommandName),
395                                   llvm::makeArrayRef(A, 1));
396 }
397 
398 InlineContentComment *Sema::actOnUnknownCommand(SourceLocation LocBegin,
399                                                 SourceLocation LocEnd,
400                                                 StringRef CommandName) {
401   unsigned CommandID = Traits.registerUnknownCommand(CommandName)->getID();
402   return actOnUnknownCommand(LocBegin, LocEnd, CommandID);
403 }
404 
405 InlineContentComment *Sema::actOnUnknownCommand(SourceLocation LocBegin,
406                                                 SourceLocation LocEnd,
407                                                 unsigned CommandID) {
408   ArrayRef<InlineCommandComment::Argument> Args;
409   return new (Allocator) InlineCommandComment(
410                                   LocBegin, LocEnd, CommandID,
411                                   InlineCommandComment::RenderNormal,
412                                   Args);
413 }
414 
415 TextComment *Sema::actOnText(SourceLocation LocBegin,
416                              SourceLocation LocEnd,
417                              StringRef Text) {
418   return new (Allocator) TextComment(LocBegin, LocEnd, Text);
419 }
420 
421 VerbatimBlockComment *Sema::actOnVerbatimBlockStart(SourceLocation Loc,
422                                                     unsigned CommandID) {
423   StringRef CommandName = Traits.getCommandInfo(CommandID)->Name;
424   return new (Allocator) VerbatimBlockComment(
425                                   Loc,
426                                   Loc.getLocWithOffset(1 + CommandName.size()),
427                                   CommandID);
428 }
429 
430 VerbatimBlockLineComment *Sema::actOnVerbatimBlockLine(SourceLocation Loc,
431                                                        StringRef Text) {
432   return new (Allocator) VerbatimBlockLineComment(Loc, Text);
433 }
434 
435 void Sema::actOnVerbatimBlockFinish(
436                             VerbatimBlockComment *Block,
437                             SourceLocation CloseNameLocBegin,
438                             StringRef CloseName,
439                             ArrayRef<VerbatimBlockLineComment *> Lines) {
440   Block->setCloseName(CloseName, CloseNameLocBegin);
441   Block->setLines(Lines);
442 }
443 
444 VerbatimLineComment *Sema::actOnVerbatimLine(SourceLocation LocBegin,
445                                              unsigned CommandID,
446                                              SourceLocation TextBegin,
447                                              StringRef Text) {
448   VerbatimLineComment *VL = new (Allocator) VerbatimLineComment(
449                               LocBegin,
450                               TextBegin.getLocWithOffset(Text.size()),
451                               CommandID,
452                               TextBegin,
453                               Text);
454   checkFunctionDeclVerbatimLine(VL);
455   checkContainerDeclVerbatimLine(VL);
456   return VL;
457 }
458 
459 HTMLStartTagComment *Sema::actOnHTMLStartTagStart(SourceLocation LocBegin,
460                                                   StringRef TagName) {
461   return new (Allocator) HTMLStartTagComment(LocBegin, TagName);
462 }
463 
464 void Sema::actOnHTMLStartTagFinish(
465                               HTMLStartTagComment *Tag,
466                               ArrayRef<HTMLStartTagComment::Attribute> Attrs,
467                               SourceLocation GreaterLoc,
468                               bool IsSelfClosing) {
469   Tag->setAttrs(Attrs);
470   Tag->setGreaterLoc(GreaterLoc);
471   if (IsSelfClosing)
472     Tag->setSelfClosing();
473   else if (!isHTMLEndTagForbidden(Tag->getTagName()))
474     HTMLOpenTags.push_back(Tag);
475 }
476 
477 HTMLEndTagComment *Sema::actOnHTMLEndTag(SourceLocation LocBegin,
478                                          SourceLocation LocEnd,
479                                          StringRef TagName) {
480   HTMLEndTagComment *HET =
481       new (Allocator) HTMLEndTagComment(LocBegin, LocEnd, TagName);
482   if (isHTMLEndTagForbidden(TagName)) {
483     Diag(HET->getLocation(), diag::warn_doc_html_end_forbidden)
484       << TagName << HET->getSourceRange();
485     return HET;
486   }
487 
488   bool FoundOpen = false;
489   for (SmallVectorImpl<HTMLStartTagComment *>::const_reverse_iterator
490        I = HTMLOpenTags.rbegin(), E = HTMLOpenTags.rend();
491        I != E; ++I) {
492     if ((*I)->getTagName() == TagName) {
493       FoundOpen = true;
494       break;
495     }
496   }
497   if (!FoundOpen) {
498     Diag(HET->getLocation(), diag::warn_doc_html_end_unbalanced)
499       << HET->getSourceRange();
500     return HET;
501   }
502 
503   while (!HTMLOpenTags.empty()) {
504     const HTMLStartTagComment *HST = HTMLOpenTags.pop_back_val();
505     StringRef LastNotClosedTagName = HST->getTagName();
506     if (LastNotClosedTagName == TagName)
507       break;
508 
509     if (isHTMLEndTagOptional(LastNotClosedTagName))
510       continue;
511 
512     bool OpenLineInvalid;
513     const unsigned OpenLine = SourceMgr.getPresumedLineNumber(
514                                                 HST->getLocation(),
515                                                 &OpenLineInvalid);
516     bool CloseLineInvalid;
517     const unsigned CloseLine = SourceMgr.getPresumedLineNumber(
518                                                 HET->getLocation(),
519                                                 &CloseLineInvalid);
520 
521     if (OpenLineInvalid || CloseLineInvalid || OpenLine == CloseLine)
522       Diag(HST->getLocation(), diag::warn_doc_html_start_end_mismatch)
523         << HST->getTagName() << HET->getTagName()
524         << HST->getSourceRange() << HET->getSourceRange();
525     else {
526       Diag(HST->getLocation(), diag::warn_doc_html_start_end_mismatch)
527         << HST->getTagName() << HET->getTagName()
528         << HST->getSourceRange();
529       Diag(HET->getLocation(), diag::note_doc_html_end_tag)
530         << HET->getSourceRange();
531     }
532   }
533 
534   return HET;
535 }
536 
537 FullComment *Sema::actOnFullComment(
538                               ArrayRef<BlockContentComment *> Blocks) {
539   FullComment *FC = new (Allocator) FullComment(Blocks, ThisDeclInfo);
540   resolveParamCommandIndexes(FC);
541   return FC;
542 }
543 
544 void Sema::checkBlockCommandEmptyParagraph(BlockCommandComment *Command) {
545   if (Traits.getCommandInfo(Command->getCommandID())->IsEmptyParagraphAllowed)
546     return;
547 
548   ParagraphComment *Paragraph = Command->getParagraph();
549   if (Paragraph->isWhitespace()) {
550     SourceLocation DiagLoc;
551     if (Command->getNumArgs() > 0)
552       DiagLoc = Command->getArgRange(Command->getNumArgs() - 1).getEnd();
553     if (!DiagLoc.isValid())
554       DiagLoc = Command->getCommandNameRange(Traits).getEnd();
555     Diag(DiagLoc, diag::warn_doc_block_command_empty_paragraph)
556       << Command->getCommandMarker()
557       << Command->getCommandName(Traits)
558       << Command->getSourceRange();
559   }
560 }
561 
562 void Sema::checkReturnsCommand(const BlockCommandComment *Command) {
563   if (!Traits.getCommandInfo(Command->getCommandID())->IsReturnsCommand)
564     return;
565 
566   assert(ThisDeclInfo && "should not call this check on a bare comment");
567 
568   if (isFunctionDecl()) {
569     if (ThisDeclInfo->ReturnType->isVoidType()) {
570       unsigned DiagKind;
571       switch (ThisDeclInfo->CommentDecl->getKind()) {
572       default:
573         if (ThisDeclInfo->IsObjCMethod)
574           DiagKind = 3;
575         else
576           DiagKind = 0;
577         break;
578       case Decl::CXXConstructor:
579         DiagKind = 1;
580         break;
581       case Decl::CXXDestructor:
582         DiagKind = 2;
583         break;
584       }
585       Diag(Command->getLocation(),
586            diag::warn_doc_returns_attached_to_a_void_function)
587         << Command->getCommandMarker()
588         << Command->getCommandName(Traits)
589         << DiagKind
590         << Command->getSourceRange();
591     }
592     return;
593   }
594   else if (isObjCPropertyDecl())
595     return;
596 
597   Diag(Command->getLocation(),
598        diag::warn_doc_returns_not_attached_to_a_function_decl)
599     << Command->getCommandMarker()
600     << Command->getCommandName(Traits)
601     << Command->getSourceRange();
602 }
603 
604 void Sema::checkBlockCommandDuplicate(const BlockCommandComment *Command) {
605   const CommandInfo *Info = Traits.getCommandInfo(Command->getCommandID());
606   const BlockCommandComment *PrevCommand = NULL;
607   if (Info->IsBriefCommand) {
608     if (!BriefCommand) {
609       BriefCommand = Command;
610       return;
611     }
612     PrevCommand = BriefCommand;
613   } else if (Info->IsHeaderfileCommand) {
614     if (!HeaderfileCommand) {
615       HeaderfileCommand = Command;
616       return;
617     }
618     PrevCommand = HeaderfileCommand;
619   } else {
620     // We don't want to check this command for duplicates.
621     return;
622   }
623   StringRef CommandName = Command->getCommandName(Traits);
624   StringRef PrevCommandName = PrevCommand->getCommandName(Traits);
625   Diag(Command->getLocation(), diag::warn_doc_block_command_duplicate)
626       << Command->getCommandMarker()
627       << CommandName
628       << Command->getSourceRange();
629   if (CommandName == PrevCommandName)
630     Diag(PrevCommand->getLocation(), diag::note_doc_block_command_previous)
631         << PrevCommand->getCommandMarker()
632         << PrevCommandName
633         << PrevCommand->getSourceRange();
634   else
635     Diag(PrevCommand->getLocation(),
636          diag::note_doc_block_command_previous_alias)
637         << PrevCommand->getCommandMarker()
638         << PrevCommandName
639         << CommandName;
640 }
641 
642 void Sema::checkDeprecatedCommand(const BlockCommandComment *Command) {
643   if (!Traits.getCommandInfo(Command->getCommandID())->IsDeprecatedCommand)
644     return;
645 
646   assert(ThisDeclInfo && "should not call this check on a bare comment");
647 
648   const Decl *D = ThisDeclInfo->CommentDecl;
649   if (!D)
650     return;
651 
652   if (D->hasAttr<DeprecatedAttr>() ||
653       D->hasAttr<AvailabilityAttr>() ||
654       D->hasAttr<UnavailableAttr>())
655     return;
656 
657   Diag(Command->getLocation(),
658        diag::warn_doc_deprecated_not_sync)
659     << Command->getSourceRange();
660 
661   // Try to emit a fixit with a deprecation attribute.
662   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
663     // Don't emit a Fix-It for non-member function definitions.  GCC does not
664     // accept attributes on them.
665     const DeclContext *Ctx = FD->getDeclContext();
666     if ((!Ctx || !Ctx->isRecord()) &&
667         FD->doesThisDeclarationHaveABody())
668       return;
669 
670     StringRef AttributeSpelling = "__attribute__((deprecated))";
671     if (PP) {
672       TokenValue Tokens[] = {
673         tok::kw___attribute, tok::l_paren, tok::l_paren,
674         PP->getIdentifierInfo("deprecated"),
675         tok::r_paren, tok::r_paren
676       };
677       StringRef MacroName = PP->getLastMacroWithSpelling(FD->getLocation(),
678                                                          Tokens);
679       if (!MacroName.empty())
680         AttributeSpelling = MacroName;
681     }
682 
683     SmallString<64> TextToInsert(" ");
684     TextToInsert += AttributeSpelling;
685     Diag(FD->getLocEnd(),
686          diag::note_add_deprecation_attr)
687       << FixItHint::CreateInsertion(FD->getLocEnd().getLocWithOffset(1),
688                                     TextToInsert);
689   }
690 }
691 
692 void Sema::resolveParamCommandIndexes(const FullComment *FC) {
693   if (!isFunctionDecl()) {
694     // We already warned that \\param commands are not attached to a function
695     // decl.
696     return;
697   }
698 
699   SmallVector<ParamCommandComment *, 8> UnresolvedParamCommands;
700 
701   // Comment AST nodes that correspond to \c ParamVars for which we have
702   // found a \\param command or NULL if no documentation was found so far.
703   SmallVector<ParamCommandComment *, 8> ParamVarDocs;
704 
705   ArrayRef<const ParmVarDecl *> ParamVars = getParamVars();
706   ParamVarDocs.resize(ParamVars.size(), NULL);
707 
708   // First pass over all \\param commands: resolve all parameter names.
709   for (Comment::child_iterator I = FC->child_begin(), E = FC->child_end();
710        I != E; ++I) {
711     ParamCommandComment *PCC = dyn_cast<ParamCommandComment>(*I);
712     if (!PCC || !PCC->hasParamName())
713       continue;
714     StringRef ParamName = PCC->getParamNameAsWritten();
715 
716     // Check that referenced parameter name is in the function decl.
717     const unsigned ResolvedParamIndex = resolveParmVarReference(ParamName,
718                                                                 ParamVars);
719     if (ResolvedParamIndex == ParamCommandComment::VarArgParamIndex) {
720       PCC->setIsVarArgParam();
721       continue;
722     }
723     if (ResolvedParamIndex == ParamCommandComment::InvalidParamIndex) {
724       UnresolvedParamCommands.push_back(PCC);
725       continue;
726     }
727     PCC->setParamIndex(ResolvedParamIndex);
728     if (ParamVarDocs[ResolvedParamIndex]) {
729       SourceRange ArgRange = PCC->getParamNameRange();
730       Diag(ArgRange.getBegin(), diag::warn_doc_param_duplicate)
731         << ParamName << ArgRange;
732       ParamCommandComment *PrevCommand = ParamVarDocs[ResolvedParamIndex];
733       Diag(PrevCommand->getLocation(), diag::note_doc_param_previous)
734         << PrevCommand->getParamNameRange();
735     }
736     ParamVarDocs[ResolvedParamIndex] = PCC;
737   }
738 
739   // Find parameter declarations that have no corresponding \\param.
740   SmallVector<const ParmVarDecl *, 8> OrphanedParamDecls;
741   for (unsigned i = 0, e = ParamVarDocs.size(); i != e; ++i) {
742     if (!ParamVarDocs[i])
743       OrphanedParamDecls.push_back(ParamVars[i]);
744   }
745 
746   // Second pass over unresolved \\param commands: do typo correction.
747   // Suggest corrections from a set of parameter declarations that have no
748   // corresponding \\param.
749   for (unsigned i = 0, e = UnresolvedParamCommands.size(); i != e; ++i) {
750     const ParamCommandComment *PCC = UnresolvedParamCommands[i];
751 
752     SourceRange ArgRange = PCC->getParamNameRange();
753     StringRef ParamName = PCC->getParamNameAsWritten();
754     Diag(ArgRange.getBegin(), diag::warn_doc_param_not_found)
755       << ParamName << ArgRange;
756 
757     // All parameters documented -- can't suggest a correction.
758     if (OrphanedParamDecls.size() == 0)
759       continue;
760 
761     unsigned CorrectedParamIndex = ParamCommandComment::InvalidParamIndex;
762     if (OrphanedParamDecls.size() == 1) {
763       // If one parameter is not documented then that parameter is the only
764       // possible suggestion.
765       CorrectedParamIndex = 0;
766     } else {
767       // Do typo correction.
768       CorrectedParamIndex = correctTypoInParmVarReference(ParamName,
769                                                           OrphanedParamDecls);
770     }
771     if (CorrectedParamIndex != ParamCommandComment::InvalidParamIndex) {
772       const ParmVarDecl *CorrectedPVD = OrphanedParamDecls[CorrectedParamIndex];
773       if (const IdentifierInfo *CorrectedII = CorrectedPVD->getIdentifier())
774         Diag(ArgRange.getBegin(), diag::note_doc_param_name_suggestion)
775           << CorrectedII->getName()
776           << FixItHint::CreateReplacement(ArgRange, CorrectedII->getName());
777     }
778   }
779 }
780 
781 bool Sema::isFunctionDecl() {
782   if (!ThisDeclInfo)
783     return false;
784   if (!ThisDeclInfo->IsFilled)
785     inspectThisDecl();
786   return ThisDeclInfo->getKind() == DeclInfo::FunctionKind;
787 }
788 
789 bool Sema::isAnyFunctionDecl() {
790   return isFunctionDecl() && ThisDeclInfo->CurrentDecl &&
791          isa<FunctionDecl>(ThisDeclInfo->CurrentDecl);
792 }
793 
794 bool Sema::isFunctionOrMethodVariadic() {
795   if (!isAnyFunctionDecl() && !isObjCMethodDecl())
796     return false;
797   if (const FunctionDecl *FD =
798         dyn_cast<FunctionDecl>(ThisDeclInfo->CurrentDecl))
799     return FD->isVariadic();
800   if (const ObjCMethodDecl *MD =
801         dyn_cast<ObjCMethodDecl>(ThisDeclInfo->CurrentDecl))
802     return MD->isVariadic();
803   return false;
804 }
805 
806 bool Sema::isObjCMethodDecl() {
807   return isFunctionDecl() && ThisDeclInfo->CurrentDecl &&
808          isa<ObjCMethodDecl>(ThisDeclInfo->CurrentDecl);
809 }
810 
811 bool Sema::isFunctionPointerVarDecl() {
812   if (!ThisDeclInfo)
813     return false;
814   if (!ThisDeclInfo->IsFilled)
815     inspectThisDecl();
816   if (ThisDeclInfo->getKind() == DeclInfo::VariableKind) {
817     if (const VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDeclInfo->CurrentDecl)) {
818       QualType QT = VD->getType();
819       return QT->isFunctionPointerType();
820     }
821   }
822   return false;
823 }
824 
825 bool Sema::isObjCPropertyDecl() {
826   if (!ThisDeclInfo)
827     return false;
828   if (!ThisDeclInfo->IsFilled)
829     inspectThisDecl();
830   return ThisDeclInfo->CurrentDecl->getKind() == Decl::ObjCProperty;
831 }
832 
833 bool Sema::isTemplateOrSpecialization() {
834   if (!ThisDeclInfo)
835     return false;
836   if (!ThisDeclInfo->IsFilled)
837     inspectThisDecl();
838   return ThisDeclInfo->getTemplateKind() != DeclInfo::NotTemplate;
839 }
840 
841 bool Sema::isRecordLikeDecl() {
842   if (!ThisDeclInfo)
843     return false;
844   if (!ThisDeclInfo->IsFilled)
845     inspectThisDecl();
846   return isUnionDecl() || isClassOrStructDecl() || isObjCInterfaceDecl() ||
847          isObjCProtocolDecl();
848 }
849 
850 bool Sema::isUnionDecl() {
851   if (!ThisDeclInfo)
852     return false;
853   if (!ThisDeclInfo->IsFilled)
854     inspectThisDecl();
855   if (const RecordDecl *RD =
856         dyn_cast_or_null<RecordDecl>(ThisDeclInfo->CurrentDecl))
857     return RD->isUnion();
858   return false;
859 }
860 
861 bool Sema::isClassOrStructDecl() {
862   if (!ThisDeclInfo)
863     return false;
864   if (!ThisDeclInfo->IsFilled)
865     inspectThisDecl();
866   return ThisDeclInfo->CurrentDecl &&
867          isa<RecordDecl>(ThisDeclInfo->CurrentDecl) &&
868          !isUnionDecl();
869 }
870 
871 bool Sema::isClassTemplateDecl() {
872   if (!ThisDeclInfo)
873     return false;
874   if (!ThisDeclInfo->IsFilled)
875     inspectThisDecl();
876   return ThisDeclInfo->CurrentDecl &&
877           (isa<ClassTemplateDecl>(ThisDeclInfo->CurrentDecl));
878 }
879 
880 bool Sema::isFunctionTemplateDecl() {
881   if (!ThisDeclInfo)
882     return false;
883   if (!ThisDeclInfo->IsFilled)
884     inspectThisDecl();
885   return ThisDeclInfo->CurrentDecl &&
886          (isa<FunctionTemplateDecl>(ThisDeclInfo->CurrentDecl));
887 }
888 
889 bool Sema::isObjCInterfaceDecl() {
890   if (!ThisDeclInfo)
891     return false;
892   if (!ThisDeclInfo->IsFilled)
893     inspectThisDecl();
894   return ThisDeclInfo->CurrentDecl &&
895          isa<ObjCInterfaceDecl>(ThisDeclInfo->CurrentDecl);
896 }
897 
898 bool Sema::isObjCProtocolDecl() {
899   if (!ThisDeclInfo)
900     return false;
901   if (!ThisDeclInfo->IsFilled)
902     inspectThisDecl();
903   return ThisDeclInfo->CurrentDecl &&
904          isa<ObjCProtocolDecl>(ThisDeclInfo->CurrentDecl);
905 }
906 
907 ArrayRef<const ParmVarDecl *> Sema::getParamVars() {
908   if (!ThisDeclInfo->IsFilled)
909     inspectThisDecl();
910   return ThisDeclInfo->ParamVars;
911 }
912 
913 void Sema::inspectThisDecl() {
914   ThisDeclInfo->fill();
915 }
916 
917 unsigned Sema::resolveParmVarReference(StringRef Name,
918                                        ArrayRef<const ParmVarDecl *> ParamVars) {
919   for (unsigned i = 0, e = ParamVars.size(); i != e; ++i) {
920     const IdentifierInfo *II = ParamVars[i]->getIdentifier();
921     if (II && II->getName() == Name)
922       return i;
923   }
924   if (Name == "..." && isFunctionOrMethodVariadic())
925     return ParamCommandComment::VarArgParamIndex;
926   return ParamCommandComment::InvalidParamIndex;
927 }
928 
929 namespace {
930 class SimpleTypoCorrector {
931   StringRef Typo;
932   const unsigned MaxEditDistance;
933 
934   const NamedDecl *BestDecl;
935   unsigned BestEditDistance;
936   unsigned BestIndex;
937   unsigned NextIndex;
938 
939 public:
940   SimpleTypoCorrector(StringRef Typo) :
941       Typo(Typo), MaxEditDistance((Typo.size() + 2) / 3),
942       BestDecl(NULL), BestEditDistance(MaxEditDistance + 1),
943       BestIndex(0), NextIndex(0)
944   { }
945 
946   void addDecl(const NamedDecl *ND);
947 
948   const NamedDecl *getBestDecl() const {
949     if (BestEditDistance > MaxEditDistance)
950       return NULL;
951 
952     return BestDecl;
953   }
954 
955   unsigned getBestDeclIndex() const {
956     assert(getBestDecl());
957     return BestIndex;
958   }
959 };
960 
961 void SimpleTypoCorrector::addDecl(const NamedDecl *ND) {
962   unsigned CurrIndex = NextIndex++;
963 
964   const IdentifierInfo *II = ND->getIdentifier();
965   if (!II)
966     return;
967 
968   StringRef Name = II->getName();
969   unsigned MinPossibleEditDistance = abs((int)Name.size() - (int)Typo.size());
970   if (MinPossibleEditDistance > 0 &&
971       Typo.size() / MinPossibleEditDistance < 3)
972     return;
973 
974   unsigned EditDistance = Typo.edit_distance(Name, true, MaxEditDistance);
975   if (EditDistance < BestEditDistance) {
976     BestEditDistance = EditDistance;
977     BestDecl = ND;
978     BestIndex = CurrIndex;
979   }
980 }
981 } // unnamed namespace
982 
983 unsigned Sema::correctTypoInParmVarReference(
984                                     StringRef Typo,
985                                     ArrayRef<const ParmVarDecl *> ParamVars) {
986   SimpleTypoCorrector Corrector(Typo);
987   for (unsigned i = 0, e = ParamVars.size(); i != e; ++i)
988     Corrector.addDecl(ParamVars[i]);
989   if (Corrector.getBestDecl())
990     return Corrector.getBestDeclIndex();
991   else
992     return ParamCommandComment::InvalidParamIndex;
993 }
994 
995 namespace {
996 bool ResolveTParamReferenceHelper(
997                             StringRef Name,
998                             const TemplateParameterList *TemplateParameters,
999                             SmallVectorImpl<unsigned> *Position) {
1000   for (unsigned i = 0, e = TemplateParameters->size(); i != e; ++i) {
1001     const NamedDecl *Param = TemplateParameters->getParam(i);
1002     const IdentifierInfo *II = Param->getIdentifier();
1003     if (II && II->getName() == Name) {
1004       Position->push_back(i);
1005       return true;
1006     }
1007 
1008     if (const TemplateTemplateParmDecl *TTP =
1009             dyn_cast<TemplateTemplateParmDecl>(Param)) {
1010       Position->push_back(i);
1011       if (ResolveTParamReferenceHelper(Name, TTP->getTemplateParameters(),
1012                                        Position))
1013         return true;
1014       Position->pop_back();
1015     }
1016   }
1017   return false;
1018 }
1019 } // unnamed namespace
1020 
1021 bool Sema::resolveTParamReference(
1022                             StringRef Name,
1023                             const TemplateParameterList *TemplateParameters,
1024                             SmallVectorImpl<unsigned> *Position) {
1025   Position->clear();
1026   if (!TemplateParameters)
1027     return false;
1028 
1029   return ResolveTParamReferenceHelper(Name, TemplateParameters, Position);
1030 }
1031 
1032 namespace {
1033 void CorrectTypoInTParamReferenceHelper(
1034                             const TemplateParameterList *TemplateParameters,
1035                             SimpleTypoCorrector &Corrector) {
1036   for (unsigned i = 0, e = TemplateParameters->size(); i != e; ++i) {
1037     const NamedDecl *Param = TemplateParameters->getParam(i);
1038     Corrector.addDecl(Param);
1039 
1040     if (const TemplateTemplateParmDecl *TTP =
1041             dyn_cast<TemplateTemplateParmDecl>(Param))
1042       CorrectTypoInTParamReferenceHelper(TTP->getTemplateParameters(),
1043                                          Corrector);
1044   }
1045 }
1046 } // unnamed namespace
1047 
1048 StringRef Sema::correctTypoInTParamReference(
1049                             StringRef Typo,
1050                             const TemplateParameterList *TemplateParameters) {
1051   SimpleTypoCorrector Corrector(Typo);
1052   CorrectTypoInTParamReferenceHelper(TemplateParameters, Corrector);
1053   if (const NamedDecl *ND = Corrector.getBestDecl()) {
1054     const IdentifierInfo *II = ND->getIdentifier();
1055     assert(II && "SimpleTypoCorrector should not return this decl");
1056     return II->getName();
1057   }
1058   return StringRef();
1059 }
1060 
1061 InlineCommandComment::RenderKind
1062 Sema::getInlineCommandRenderKind(StringRef Name) const {
1063   assert(Traits.getCommandInfo(Name)->IsInlineCommand);
1064 
1065   return llvm::StringSwitch<InlineCommandComment::RenderKind>(Name)
1066       .Case("b", InlineCommandComment::RenderBold)
1067       .Cases("c", "p", InlineCommandComment::RenderMonospaced)
1068       .Cases("a", "e", "em", InlineCommandComment::RenderEmphasized)
1069       .Default(InlineCommandComment::RenderNormal);
1070 }
1071 
1072 } // end namespace comments
1073 } // end namespace clang
1074 
1075