Comment.cpp revision e4330a302ac20b41b9800267ebd4b5b01f8553f8 
1//===--- Comment.cpp - Comment AST node implementation --------------------===//
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/ASTContext.h"
11#include "clang/AST/Comment.h"
12#include "clang/AST/Decl.h"
13#include "clang/AST/DeclObjC.h"
14#include "clang/AST/DeclTemplate.h"
15#include "llvm/Support/ErrorHandling.h"
16#include "llvm/Support/raw_ostream.h"
17
18namespace clang {
19namespace comments {
20
21const char *Comment::getCommentKindName() const {
22  switch (getCommentKind()) {
23  case NoCommentKind: return "NoCommentKind";
24#define ABSTRACT_COMMENT(COMMENT)
25#define COMMENT(CLASS, PARENT) \
26  case CLASS##Kind: \
27    return #CLASS;
28#include "clang/AST/CommentNodes.inc"
29#undef COMMENT
30#undef ABSTRACT_COMMENT
31  }
32  llvm_unreachable("Unknown comment kind!");
33}
34
35void Comment::dump() const {
36  // It is important that Comment::dump() is defined in a different TU than
37  // Comment::dump(raw_ostream, SourceManager).  If both functions were defined
38  // in CommentDumper.cpp, that object file would be removed by linker because
39  // none of its functions are referenced by other object files, despite the
40  // LLVM_ATTRIBUTE_USED.
41  dump(llvm::errs(), NULL, NULL);
42}
43
44void Comment::dump(const ASTContext &Context) const {
45  dump(llvm::errs(), &Context.getCommentCommandTraits(),
46       &Context.getSourceManager());
47}
48
49namespace {
50struct good {};
51struct bad {};
52
53template <typename T>
54good implements_child_begin_end(Comment::child_iterator (T::*)() const) {
55  return good();
56}
57
58static inline bad implements_child_begin_end(
59                      Comment::child_iterator (Comment::*)() const) {
60  return bad();
61}
62
63#define ASSERT_IMPLEMENTS_child_begin(function) \
64  (void) sizeof(good(implements_child_begin_end(function)))
65
66static inline void CheckCommentASTNodes() {
67#define ABSTRACT_COMMENT(COMMENT)
68#define COMMENT(CLASS, PARENT) \
69  ASSERT_IMPLEMENTS_child_begin(&CLASS::child_begin); \
70  ASSERT_IMPLEMENTS_child_begin(&CLASS::child_end);
71#include "clang/AST/CommentNodes.inc"
72#undef COMMENT
73#undef ABSTRACT_COMMENT
74}
75
76#undef ASSERT_IMPLEMENTS_child_begin
77
78} // end unnamed namespace
79
80Comment::child_iterator Comment::child_begin() const {
81  switch (getCommentKind()) {
82  case NoCommentKind: llvm_unreachable("comment without a kind");
83#define ABSTRACT_COMMENT(COMMENT)
84#define COMMENT(CLASS, PARENT) \
85  case CLASS##Kind: \
86    return static_cast<const CLASS *>(this)->child_begin();
87#include "clang/AST/CommentNodes.inc"
88#undef COMMENT
89#undef ABSTRACT_COMMENT
90  }
91  llvm_unreachable("Unknown comment kind!");
92}
93
94Comment::child_iterator Comment::child_end() const {
95  switch (getCommentKind()) {
96  case NoCommentKind: llvm_unreachable("comment without a kind");
97#define ABSTRACT_COMMENT(COMMENT)
98#define COMMENT(CLASS, PARENT) \
99  case CLASS##Kind: \
100    return static_cast<const CLASS *>(this)->child_end();
101#include "clang/AST/CommentNodes.inc"
102#undef COMMENT
103#undef ABSTRACT_COMMENT
104  }
105  llvm_unreachable("Unknown comment kind!");
106}
107
108bool TextComment::isWhitespaceNoCache() const {
109  for (StringRef::const_iterator I = Text.begin(), E = Text.end();
110       I != E; ++I) {
111    const char C = *I;
112    if (C != ' ' && C != '\n' && C != '\r' &&
113        C != '\t' && C != '\f' && C != '\v')
114      return false;
115  }
116  return true;
117}
118
119bool ParagraphComment::isWhitespaceNoCache() const {
120  for (child_iterator I = child_begin(), E = child_end(); I != E; ++I) {
121    if (const TextComment *TC = dyn_cast<TextComment>(*I)) {
122      if (!TC->isWhitespace())
123        return false;
124    } else
125      return false;
126  }
127  return true;
128}
129
130const char *ParamCommandComment::getDirectionAsString(PassDirection D) {
131  switch (D) {
132  case ParamCommandComment::In:
133    return "[in]";
134  case ParamCommandComment::Out:
135    return "[out]";
136  case ParamCommandComment::InOut:
137    return "[in,out]";
138  }
139  llvm_unreachable("unknown PassDirection");
140}
141
142void DeclInfo::fill() {
143  assert(!IsFilled);
144
145  // Set defaults.
146  Kind = OtherKind;
147  TemplateKind = NotTemplate;
148  IsObjCMethod = false;
149  IsInstanceMethod = false;
150  IsClassMethod = false;
151  ParamVars = ArrayRef<const ParmVarDecl *>();
152  TemplateParameters = NULL;
153
154  if (!ThisDecl) {
155    // If there is no declaration, the defaults is our only guess.
156    IsFilled = true;
157    return;
158  }
159
160  Decl::Kind K = ThisDecl->getKind();
161  switch (K) {
162  default:
163    // Defaults are should be good for declarations we don't handle explicitly.
164    break;
165  case Decl::Function:
166  case Decl::CXXMethod:
167  case Decl::CXXConstructor:
168  case Decl::CXXDestructor:
169  case Decl::CXXConversion: {
170    const FunctionDecl *FD = cast<FunctionDecl>(ThisDecl);
171    Kind = FunctionKind;
172    ParamVars = ArrayRef<const ParmVarDecl *>(FD->param_begin(),
173                                              FD->getNumParams());
174    ResultType = FD->getResultType();
175    unsigned NumLists = FD->getNumTemplateParameterLists();
176    if (NumLists != 0) {
177      TemplateKind = TemplateSpecialization;
178      TemplateParameters =
179          FD->getTemplateParameterList(NumLists - 1);
180    }
181
182    if (K == Decl::CXXMethod || K == Decl::CXXConstructor ||
183        K == Decl::CXXDestructor || K == Decl::CXXConversion) {
184      const CXXMethodDecl *MD = cast<CXXMethodDecl>(ThisDecl);
185      IsInstanceMethod = MD->isInstance();
186      IsClassMethod = !IsInstanceMethod;
187    }
188    break;
189  }
190  case Decl::ObjCMethod: {
191    const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(ThisDecl);
192    Kind = FunctionKind;
193    ParamVars = ArrayRef<const ParmVarDecl *>(MD->param_begin(),
194                                              MD->param_size());
195    ResultType = MD->getResultType();
196    IsObjCMethod = true;
197    IsInstanceMethod = MD->isInstanceMethod();
198    IsClassMethod = !IsInstanceMethod;
199    break;
200  }
201  case Decl::FunctionTemplate: {
202    const FunctionTemplateDecl *FTD = cast<FunctionTemplateDecl>(ThisDecl);
203    Kind = FunctionKind;
204    TemplateKind = Template;
205    const FunctionDecl *FD = FTD->getTemplatedDecl();
206    ParamVars = ArrayRef<const ParmVarDecl *>(FD->param_begin(),
207                                              FD->getNumParams());
208    ResultType = FD->getResultType();
209    TemplateParameters = FTD->getTemplateParameters();
210    break;
211  }
212  case Decl::ClassTemplate: {
213    const ClassTemplateDecl *CTD = cast<ClassTemplateDecl>(ThisDecl);
214    Kind = ClassKind;
215    TemplateKind = Template;
216    TemplateParameters = CTD->getTemplateParameters();
217    break;
218  }
219  case Decl::ClassTemplatePartialSpecialization: {
220    const ClassTemplatePartialSpecializationDecl *CTPSD =
221        cast<ClassTemplatePartialSpecializationDecl>(ThisDecl);
222    Kind = ClassKind;
223    TemplateKind = TemplatePartialSpecialization;
224    TemplateParameters = CTPSD->getTemplateParameters();
225    break;
226  }
227  case Decl::ClassTemplateSpecialization:
228    Kind = ClassKind;
229    TemplateKind = TemplateSpecialization;
230    break;
231  case Decl::Record:
232  case Decl::CXXRecord:
233    Kind = ClassKind;
234    break;
235  case Decl::Var:
236  case Decl::Field:
237  case Decl::EnumConstant:
238  case Decl::ObjCIvar:
239  case Decl::ObjCAtDefsField:
240    Kind = VariableKind;
241    break;
242  case Decl::Namespace:
243    Kind = NamespaceKind;
244    break;
245  case Decl::Typedef: {
246    Kind = TypedefKind;
247    // If this is a typedef to something we consider a function, extract
248    // arguments and return type.
249    const TypedefDecl *TD = cast<TypedefDecl>(ThisDecl);
250    const TypeSourceInfo *TSI = TD->getTypeSourceInfo();
251    if (!TSI)
252      break;
253    TypeLoc TL = TSI->getTypeLoc().getUnqualifiedLoc();
254    while (true) {
255      TL = TL.IgnoreParens();
256      // Look through typedefs.
257      if (TypedefTypeLoc *TypedefTL = dyn_cast<TypedefTypeLoc>(&TL)) {
258        TSI = TypedefTL->getTypedefNameDecl()->getTypeSourceInfo();
259        if (TSI)
260          break;
261        TL = TSI->getTypeLoc().getUnqualifiedLoc();
262        continue;
263      }
264      // Look through qualified types.
265      if (QualifiedTypeLoc *QualifiedTL = dyn_cast<QualifiedTypeLoc>(&TL)) {
266        TL = QualifiedTL->getUnqualifiedLoc();
267        continue;
268      }
269      // Look through pointer types.
270      if (PointerTypeLoc *PointerTL = dyn_cast<PointerTypeLoc>(&TL)) {
271        TL = PointerTL->getPointeeLoc().getUnqualifiedLoc();
272        continue;
273      }
274      if (BlockPointerTypeLoc *BlockPointerTL =
275              dyn_cast<BlockPointerTypeLoc>(&TL)) {
276        TL = BlockPointerTL->getPointeeLoc().getUnqualifiedLoc();
277        continue;
278      }
279      if (MemberPointerTypeLoc *MemberPointerTL =
280              dyn_cast<MemberPointerTypeLoc>(&TL)) {
281        TL = MemberPointerTL->getPointeeLoc().getUnqualifiedLoc();
282        continue;
283      }
284      // Is this a typedef for a function type?
285      if (FunctionTypeLoc *FTL = dyn_cast<FunctionTypeLoc>(&TL)) {
286        Kind = FunctionKind;
287        ArrayRef<ParmVarDecl *> Params = FTL->getParams();
288        ParamVars = ArrayRef<const ParmVarDecl *>(Params.data(),
289                                                  Params.size());
290        ResultType = FTL->getResultLoc().getType();
291        break;
292      }
293      break;
294    }
295    break;
296  }
297  case Decl::TypeAlias:
298    Kind = TypedefKind;
299    break;
300  case Decl::TypeAliasTemplate: {
301    const TypeAliasTemplateDecl *TAT = cast<TypeAliasTemplateDecl>(ThisDecl);
302    Kind = TypedefKind;
303    TemplateKind = Template;
304    TemplateParameters = TAT->getTemplateParameters();
305    break;
306  }
307  case Decl::Enum:
308    Kind = EnumKind;
309    break;
310  }
311
312  IsFilled = true;
313}
314
315} // end namespace comments
316} // end namespace clang
317
318