1 //===- CXTypes.cpp - Implements 'CXTypes' aspect of libclang ------------===//
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 'CXTypes' API hooks in the Clang-C library.
11 //
12 //===--------------------------------------------------------------------===//
13 
14 #include "CIndexer.h"
15 #include "CXCursor.h"
16 #include "CXString.h"
17 #include "CXTranslationUnit.h"
18 #include "CXType.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/DeclTemplate.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/Type.h"
24 #include "clang/Frontend/ASTUnit.h"
25 
26 using namespace clang;
27 
28 static CXTypeKind GetBuiltinTypeKind(const BuiltinType *BT) {
29 #define BTCASE(K) case BuiltinType::K: return CXType_##K
30   switch (BT->getKind()) {
31     BTCASE(Void);
32     BTCASE(Bool);
33     BTCASE(Char_U);
34     BTCASE(UChar);
35     BTCASE(Char16);
36     BTCASE(Char32);
37     BTCASE(UShort);
38     BTCASE(UInt);
39     BTCASE(ULong);
40     BTCASE(ULongLong);
41     BTCASE(UInt128);
42     BTCASE(Char_S);
43     BTCASE(SChar);
44     case BuiltinType::WChar_S: return CXType_WChar;
45     case BuiltinType::WChar_U: return CXType_WChar;
46     BTCASE(Short);
47     BTCASE(Int);
48     BTCASE(Long);
49     BTCASE(LongLong);
50     BTCASE(Int128);
51     BTCASE(Float);
52     BTCASE(Double);
53     BTCASE(LongDouble);
54     BTCASE(NullPtr);
55     BTCASE(Overload);
56     BTCASE(Dependent);
57     BTCASE(ObjCId);
58     BTCASE(ObjCClass);
59     BTCASE(ObjCSel);
60   default:
61     return CXType_Unexposed;
62   }
63 #undef BTCASE
64 }
65 
66 static CXTypeKind GetTypeKind(QualType T) {
67   const Type *TP = T.getTypePtrOrNull();
68   if (!TP)
69     return CXType_Invalid;
70 
71 #define TKCASE(K) case Type::K: return CXType_##K
72   switch (TP->getTypeClass()) {
73     case Type::Builtin:
74       return GetBuiltinTypeKind(cast<BuiltinType>(TP));
75     TKCASE(Complex);
76     TKCASE(Pointer);
77     TKCASE(BlockPointer);
78     TKCASE(LValueReference);
79     TKCASE(RValueReference);
80     TKCASE(Record);
81     TKCASE(Enum);
82     TKCASE(Typedef);
83     TKCASE(ObjCInterface);
84     TKCASE(ObjCObjectPointer);
85     TKCASE(FunctionNoProto);
86     TKCASE(FunctionProto);
87     TKCASE(ConstantArray);
88     TKCASE(IncompleteArray);
89     TKCASE(VariableArray);
90     TKCASE(DependentSizedArray);
91     TKCASE(Vector);
92     TKCASE(MemberPointer);
93     TKCASE(Auto);
94     default:
95       return CXType_Unexposed;
96   }
97 #undef TKCASE
98 }
99 
100 
101 CXType cxtype::MakeCXType(QualType T, CXTranslationUnit TU) {
102   CXTypeKind TK = CXType_Invalid;
103 
104   if (TU && !T.isNull()) {
105     // Handle attributed types as the original type
106     if (auto *ATT = T->getAs<AttributedType>()) {
107       return MakeCXType(ATT->getModifiedType(), TU);
108     }
109 
110     ASTContext &Ctx = cxtu::getASTUnit(TU)->getASTContext();
111     if (Ctx.getLangOpts().ObjC1) {
112       QualType UnqualT = T.getUnqualifiedType();
113       if (Ctx.isObjCIdType(UnqualT))
114         TK = CXType_ObjCId;
115       else if (Ctx.isObjCClassType(UnqualT))
116         TK = CXType_ObjCClass;
117       else if (Ctx.isObjCSelType(UnqualT))
118         TK = CXType_ObjCSel;
119     }
120 
121     /* Handle decayed types as the original type */
122     if (const DecayedType *DT = T->getAs<DecayedType>()) {
123       return MakeCXType(DT->getOriginalType(), TU);
124     }
125   }
126   if (TK == CXType_Invalid)
127     TK = GetTypeKind(T);
128 
129   CXType CT = { TK, { TK == CXType_Invalid ? nullptr
130                                            : T.getAsOpaquePtr(), TU } };
131   return CT;
132 }
133 
134 using cxtype::MakeCXType;
135 
136 static inline QualType GetQualType(CXType CT) {
137   return QualType::getFromOpaquePtr(CT.data[0]);
138 }
139 
140 static inline CXTranslationUnit GetTU(CXType CT) {
141   return static_cast<CXTranslationUnit>(CT.data[1]);
142 }
143 
144 extern "C" {
145 
146 CXType clang_getCursorType(CXCursor C) {
147   using namespace cxcursor;
148 
149   CXTranslationUnit TU = cxcursor::getCursorTU(C);
150   if (!TU)
151     return MakeCXType(QualType(), TU);
152 
153   ASTContext &Context = cxtu::getASTUnit(TU)->getASTContext();
154   if (clang_isExpression(C.kind)) {
155     QualType T = cxcursor::getCursorExpr(C)->getType();
156     return MakeCXType(T, TU);
157   }
158 
159   if (clang_isDeclaration(C.kind)) {
160     const Decl *D = cxcursor::getCursorDecl(C);
161     if (!D)
162       return MakeCXType(QualType(), TU);
163 
164     if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
165       return MakeCXType(Context.getTypeDeclType(TD), TU);
166     if (const ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D))
167       return MakeCXType(Context.getObjCInterfaceType(ID), TU);
168     if (const DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D))
169       return MakeCXType(DD->getType(), TU);
170     if (const ValueDecl *VD = dyn_cast<ValueDecl>(D))
171       return MakeCXType(VD->getType(), TU);
172     if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
173       return MakeCXType(PD->getType(), TU);
174     if (const FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
175       return MakeCXType(FTD->getTemplatedDecl()->getType(), TU);
176     return MakeCXType(QualType(), TU);
177   }
178 
179   if (clang_isReference(C.kind)) {
180     switch (C.kind) {
181     case CXCursor_ObjCSuperClassRef: {
182       QualType T
183         = Context.getObjCInterfaceType(getCursorObjCSuperClassRef(C).first);
184       return MakeCXType(T, TU);
185     }
186 
187     case CXCursor_ObjCClassRef: {
188       QualType T = Context.getObjCInterfaceType(getCursorObjCClassRef(C).first);
189       return MakeCXType(T, TU);
190     }
191 
192     case CXCursor_TypeRef: {
193       QualType T = Context.getTypeDeclType(getCursorTypeRef(C).first);
194       return MakeCXType(T, TU);
195 
196     }
197 
198     case CXCursor_CXXBaseSpecifier:
199       return cxtype::MakeCXType(getCursorCXXBaseSpecifier(C)->getType(), TU);
200 
201     case CXCursor_MemberRef:
202       return cxtype::MakeCXType(getCursorMemberRef(C).first->getType(), TU);
203 
204     case CXCursor_VariableRef:
205       return cxtype::MakeCXType(getCursorVariableRef(C).first->getType(), TU);
206 
207     case CXCursor_ObjCProtocolRef:
208     case CXCursor_TemplateRef:
209     case CXCursor_NamespaceRef:
210     case CXCursor_OverloadedDeclRef:
211     default:
212       break;
213     }
214 
215     return MakeCXType(QualType(), TU);
216   }
217 
218   return MakeCXType(QualType(), TU);
219 }
220 
221 CXString clang_getTypeSpelling(CXType CT) {
222   QualType T = GetQualType(CT);
223   if (T.isNull())
224     return cxstring::createEmpty();
225 
226   CXTranslationUnit TU = GetTU(CT);
227   SmallString<64> Str;
228   llvm::raw_svector_ostream OS(Str);
229   PrintingPolicy PP(cxtu::getASTUnit(TU)->getASTContext().getLangOpts());
230 
231   T.print(OS, PP);
232 
233   return cxstring::createDup(OS.str());
234 }
235 
236 CXType clang_getTypedefDeclUnderlyingType(CXCursor C) {
237   using namespace cxcursor;
238   CXTranslationUnit TU = cxcursor::getCursorTU(C);
239 
240   if (clang_isDeclaration(C.kind)) {
241     const Decl *D = cxcursor::getCursorDecl(C);
242 
243     if (const TypedefNameDecl *TD = dyn_cast_or_null<TypedefNameDecl>(D)) {
244       QualType T = TD->getUnderlyingType();
245       return MakeCXType(T, TU);
246     }
247 
248     return MakeCXType(QualType(), TU);
249   }
250 
251   return MakeCXType(QualType(), TU);
252 }
253 
254 CXType clang_getEnumDeclIntegerType(CXCursor C) {
255   using namespace cxcursor;
256   CXTranslationUnit TU = cxcursor::getCursorTU(C);
257 
258   if (clang_isDeclaration(C.kind)) {
259     const Decl *D = cxcursor::getCursorDecl(C);
260 
261     if (const EnumDecl *TD = dyn_cast_or_null<EnumDecl>(D)) {
262       QualType T = TD->getIntegerType();
263       return MakeCXType(T, TU);
264     }
265 
266     return MakeCXType(QualType(), TU);
267   }
268 
269   return MakeCXType(QualType(), TU);
270 }
271 
272 long long clang_getEnumConstantDeclValue(CXCursor C) {
273   using namespace cxcursor;
274 
275   if (clang_isDeclaration(C.kind)) {
276     const Decl *D = cxcursor::getCursorDecl(C);
277 
278     if (const EnumConstantDecl *TD = dyn_cast_or_null<EnumConstantDecl>(D)) {
279       return TD->getInitVal().getSExtValue();
280     }
281 
282     return LLONG_MIN;
283   }
284 
285   return LLONG_MIN;
286 }
287 
288 unsigned long long clang_getEnumConstantDeclUnsignedValue(CXCursor C) {
289   using namespace cxcursor;
290 
291   if (clang_isDeclaration(C.kind)) {
292     const Decl *D = cxcursor::getCursorDecl(C);
293 
294     if (const EnumConstantDecl *TD = dyn_cast_or_null<EnumConstantDecl>(D)) {
295       return TD->getInitVal().getZExtValue();
296     }
297 
298     return ULLONG_MAX;
299   }
300 
301   return ULLONG_MAX;
302 }
303 
304 int clang_getFieldDeclBitWidth(CXCursor C) {
305   using namespace cxcursor;
306 
307   if (clang_isDeclaration(C.kind)) {
308     const Decl *D = getCursorDecl(C);
309 
310     if (const FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
311       if (FD->isBitField())
312         return FD->getBitWidthValue(getCursorContext(C));
313     }
314   }
315 
316   return -1;
317 }
318 
319 CXType clang_getCanonicalType(CXType CT) {
320   if (CT.kind == CXType_Invalid)
321     return CT;
322 
323   QualType T = GetQualType(CT);
324   CXTranslationUnit TU = GetTU(CT);
325 
326   if (T.isNull())
327     return MakeCXType(QualType(), GetTU(CT));
328 
329   return MakeCXType(cxtu::getASTUnit(TU)->getASTContext()
330                         .getCanonicalType(T),
331                     TU);
332 }
333 
334 unsigned clang_isConstQualifiedType(CXType CT) {
335   QualType T = GetQualType(CT);
336   return T.isLocalConstQualified();
337 }
338 
339 unsigned clang_isVolatileQualifiedType(CXType CT) {
340   QualType T = GetQualType(CT);
341   return T.isLocalVolatileQualified();
342 }
343 
344 unsigned clang_isRestrictQualifiedType(CXType CT) {
345   QualType T = GetQualType(CT);
346   return T.isLocalRestrictQualified();
347 }
348 
349 CXType clang_getPointeeType(CXType CT) {
350   QualType T = GetQualType(CT);
351   const Type *TP = T.getTypePtrOrNull();
352 
353   if (!TP)
354     return MakeCXType(QualType(), GetTU(CT));
355 
356   switch (TP->getTypeClass()) {
357     case Type::Pointer:
358       T = cast<PointerType>(TP)->getPointeeType();
359       break;
360     case Type::BlockPointer:
361       T = cast<BlockPointerType>(TP)->getPointeeType();
362       break;
363     case Type::LValueReference:
364     case Type::RValueReference:
365       T = cast<ReferenceType>(TP)->getPointeeType();
366       break;
367     case Type::ObjCObjectPointer:
368       T = cast<ObjCObjectPointerType>(TP)->getPointeeType();
369       break;
370     case Type::MemberPointer:
371       T = cast<MemberPointerType>(TP)->getPointeeType();
372       break;
373     default:
374       T = QualType();
375       break;
376   }
377   return MakeCXType(T, GetTU(CT));
378 }
379 
380 CXCursor clang_getTypeDeclaration(CXType CT) {
381   if (CT.kind == CXType_Invalid)
382     return cxcursor::MakeCXCursorInvalid(CXCursor_NoDeclFound);
383 
384   QualType T = GetQualType(CT);
385   const Type *TP = T.getTypePtrOrNull();
386 
387   if (!TP)
388     return cxcursor::MakeCXCursorInvalid(CXCursor_NoDeclFound);
389 
390   Decl *D = nullptr;
391 
392 try_again:
393   switch (TP->getTypeClass()) {
394   case Type::Typedef:
395     D = cast<TypedefType>(TP)->getDecl();
396     break;
397   case Type::ObjCObject:
398     D = cast<ObjCObjectType>(TP)->getInterface();
399     break;
400   case Type::ObjCInterface:
401     D = cast<ObjCInterfaceType>(TP)->getDecl();
402     break;
403   case Type::Record:
404   case Type::Enum:
405     D = cast<TagType>(TP)->getDecl();
406     break;
407   case Type::TemplateSpecialization:
408     if (const RecordType *Record = TP->getAs<RecordType>())
409       D = Record->getDecl();
410     else
411       D = cast<TemplateSpecializationType>(TP)->getTemplateName()
412                                                          .getAsTemplateDecl();
413     break;
414 
415   case Type::Auto:
416     TP = cast<AutoType>(TP)->getDeducedType().getTypePtrOrNull();
417     if (TP)
418       goto try_again;
419     break;
420 
421   case Type::InjectedClassName:
422     D = cast<InjectedClassNameType>(TP)->getDecl();
423     break;
424 
425   // FIXME: Template type parameters!
426 
427   case Type::Elaborated:
428     TP = cast<ElaboratedType>(TP)->getNamedType().getTypePtrOrNull();
429     goto try_again;
430 
431   default:
432     break;
433   }
434 
435   if (!D)
436     return cxcursor::MakeCXCursorInvalid(CXCursor_NoDeclFound);
437 
438   return cxcursor::MakeCXCursor(D, GetTU(CT));
439 }
440 
441 CXString clang_getTypeKindSpelling(enum CXTypeKind K) {
442   const char *s = nullptr;
443 #define TKIND(X) case CXType_##X: s = ""  #X  ""; break
444   switch (K) {
445     TKIND(Invalid);
446     TKIND(Unexposed);
447     TKIND(Void);
448     TKIND(Bool);
449     TKIND(Char_U);
450     TKIND(UChar);
451     TKIND(Char16);
452     TKIND(Char32);
453     TKIND(UShort);
454     TKIND(UInt);
455     TKIND(ULong);
456     TKIND(ULongLong);
457     TKIND(UInt128);
458     TKIND(Char_S);
459     TKIND(SChar);
460     case CXType_WChar: s = "WChar"; break;
461     TKIND(Short);
462     TKIND(Int);
463     TKIND(Long);
464     TKIND(LongLong);
465     TKIND(Int128);
466     TKIND(Float);
467     TKIND(Double);
468     TKIND(LongDouble);
469     TKIND(NullPtr);
470     TKIND(Overload);
471     TKIND(Dependent);
472     TKIND(ObjCId);
473     TKIND(ObjCClass);
474     TKIND(ObjCSel);
475     TKIND(Complex);
476     TKIND(Pointer);
477     TKIND(BlockPointer);
478     TKIND(LValueReference);
479     TKIND(RValueReference);
480     TKIND(Record);
481     TKIND(Enum);
482     TKIND(Typedef);
483     TKIND(ObjCInterface);
484     TKIND(ObjCObjectPointer);
485     TKIND(FunctionNoProto);
486     TKIND(FunctionProto);
487     TKIND(ConstantArray);
488     TKIND(IncompleteArray);
489     TKIND(VariableArray);
490     TKIND(DependentSizedArray);
491     TKIND(Vector);
492     TKIND(MemberPointer);
493     TKIND(Auto);
494   }
495 #undef TKIND
496   return cxstring::createRef(s);
497 }
498 
499 unsigned clang_equalTypes(CXType A, CXType B) {
500   return A.data[0] == B.data[0] && A.data[1] == B.data[1];
501 }
502 
503 unsigned clang_isFunctionTypeVariadic(CXType X) {
504   QualType T = GetQualType(X);
505   if (T.isNull())
506     return 0;
507 
508   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>())
509     return (unsigned)FD->isVariadic();
510 
511   if (T->getAs<FunctionNoProtoType>())
512     return 1;
513 
514   return 0;
515 }
516 
517 CXCallingConv clang_getFunctionTypeCallingConv(CXType X) {
518   QualType T = GetQualType(X);
519   if (T.isNull())
520     return CXCallingConv_Invalid;
521 
522   if (const FunctionType *FD = T->getAs<FunctionType>()) {
523 #define TCALLINGCONV(X) case CC_##X: return CXCallingConv_##X
524     switch (FD->getCallConv()) {
525       TCALLINGCONV(C);
526       TCALLINGCONV(X86StdCall);
527       TCALLINGCONV(X86FastCall);
528       TCALLINGCONV(X86ThisCall);
529       TCALLINGCONV(X86Pascal);
530       TCALLINGCONV(X86VectorCall);
531       TCALLINGCONV(X86_64Win64);
532       TCALLINGCONV(X86_64SysV);
533       TCALLINGCONV(AAPCS);
534       TCALLINGCONV(AAPCS_VFP);
535       TCALLINGCONV(IntelOclBicc);
536     case CC_SpirFunction: return CXCallingConv_Unexposed;
537     case CC_SpirKernel: return CXCallingConv_Unexposed;
538       break;
539     }
540 #undef TCALLINGCONV
541   }
542 
543   return CXCallingConv_Invalid;
544 }
545 
546 int clang_getNumArgTypes(CXType X) {
547   QualType T = GetQualType(X);
548   if (T.isNull())
549     return -1;
550 
551   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>()) {
552     return FD->getNumParams();
553   }
554 
555   if (T->getAs<FunctionNoProtoType>()) {
556     return 0;
557   }
558 
559   return -1;
560 }
561 
562 CXType clang_getArgType(CXType X, unsigned i) {
563   QualType T = GetQualType(X);
564   if (T.isNull())
565     return MakeCXType(QualType(), GetTU(X));
566 
567   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>()) {
568     unsigned numParams = FD->getNumParams();
569     if (i >= numParams)
570       return MakeCXType(QualType(), GetTU(X));
571 
572     return MakeCXType(FD->getParamType(i), GetTU(X));
573   }
574 
575   return MakeCXType(QualType(), GetTU(X));
576 }
577 
578 CXType clang_getResultType(CXType X) {
579   QualType T = GetQualType(X);
580   if (T.isNull())
581     return MakeCXType(QualType(), GetTU(X));
582 
583   if (const FunctionType *FD = T->getAs<FunctionType>())
584     return MakeCXType(FD->getReturnType(), GetTU(X));
585 
586   return MakeCXType(QualType(), GetTU(X));
587 }
588 
589 CXType clang_getCursorResultType(CXCursor C) {
590   if (clang_isDeclaration(C.kind)) {
591     const Decl *D = cxcursor::getCursorDecl(C);
592     if (const ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(D))
593       return MakeCXType(MD->getReturnType(), cxcursor::getCursorTU(C));
594 
595     return clang_getResultType(clang_getCursorType(C));
596   }
597 
598   return MakeCXType(QualType(), cxcursor::getCursorTU(C));
599 }
600 
601 unsigned clang_isPODType(CXType X) {
602   QualType T = GetQualType(X);
603   if (T.isNull())
604     return 0;
605 
606   CXTranslationUnit TU = GetTU(X);
607 
608   return T.isPODType(cxtu::getASTUnit(TU)->getASTContext()) ? 1 : 0;
609 }
610 
611 CXType clang_getElementType(CXType CT) {
612   QualType ET = QualType();
613   QualType T = GetQualType(CT);
614   const Type *TP = T.getTypePtrOrNull();
615 
616   if (TP) {
617     switch (TP->getTypeClass()) {
618     case Type::ConstantArray:
619       ET = cast<ConstantArrayType> (TP)->getElementType();
620       break;
621     case Type::IncompleteArray:
622       ET = cast<IncompleteArrayType> (TP)->getElementType();
623       break;
624     case Type::VariableArray:
625       ET = cast<VariableArrayType> (TP)->getElementType();
626       break;
627     case Type::DependentSizedArray:
628       ET = cast<DependentSizedArrayType> (TP)->getElementType();
629       break;
630     case Type::Vector:
631       ET = cast<VectorType> (TP)->getElementType();
632       break;
633     case Type::Complex:
634       ET = cast<ComplexType> (TP)->getElementType();
635       break;
636     default:
637       break;
638     }
639   }
640   return MakeCXType(ET, GetTU(CT));
641 }
642 
643 long long clang_getNumElements(CXType CT) {
644   long long result = -1;
645   QualType T = GetQualType(CT);
646   const Type *TP = T.getTypePtrOrNull();
647 
648   if (TP) {
649     switch (TP->getTypeClass()) {
650     case Type::ConstantArray:
651       result = cast<ConstantArrayType> (TP)->getSize().getSExtValue();
652       break;
653     case Type::Vector:
654       result = cast<VectorType> (TP)->getNumElements();
655       break;
656     default:
657       break;
658     }
659   }
660   return result;
661 }
662 
663 CXType clang_getArrayElementType(CXType CT) {
664   QualType ET = QualType();
665   QualType T = GetQualType(CT);
666   const Type *TP = T.getTypePtrOrNull();
667 
668   if (TP) {
669     switch (TP->getTypeClass()) {
670     case Type::ConstantArray:
671       ET = cast<ConstantArrayType> (TP)->getElementType();
672       break;
673     case Type::IncompleteArray:
674       ET = cast<IncompleteArrayType> (TP)->getElementType();
675       break;
676     case Type::VariableArray:
677       ET = cast<VariableArrayType> (TP)->getElementType();
678       break;
679     case Type::DependentSizedArray:
680       ET = cast<DependentSizedArrayType> (TP)->getElementType();
681       break;
682     default:
683       break;
684     }
685   }
686   return MakeCXType(ET, GetTU(CT));
687 }
688 
689 long long clang_getArraySize(CXType CT) {
690   long long result = -1;
691   QualType T = GetQualType(CT);
692   const Type *TP = T.getTypePtrOrNull();
693 
694   if (TP) {
695     switch (TP->getTypeClass()) {
696     case Type::ConstantArray:
697       result = cast<ConstantArrayType> (TP)->getSize().getSExtValue();
698       break;
699     default:
700       break;
701     }
702   }
703   return result;
704 }
705 
706 long long clang_Type_getAlignOf(CXType T) {
707   if (T.kind == CXType_Invalid)
708     return CXTypeLayoutError_Invalid;
709   ASTContext &Ctx = cxtu::getASTUnit(GetTU(T))->getASTContext();
710   QualType QT = GetQualType(T);
711   // [expr.alignof] p1: return size_t value for complete object type, reference
712   //                    or array.
713   // [expr.alignof] p3: if reference type, return size of referenced type
714   if (QT->isReferenceType())
715     QT = QT.getNonReferenceType();
716   if (QT->isIncompleteType())
717     return CXTypeLayoutError_Incomplete;
718   if (QT->isDependentType())
719     return CXTypeLayoutError_Dependent;
720   // Exceptions by GCC extension - see ASTContext.cpp:1313 getTypeInfoImpl
721   // if (QT->isFunctionType()) return 4; // Bug #15511 - should be 1
722   // if (QT->isVoidType()) return 1;
723   return Ctx.getTypeAlignInChars(QT).getQuantity();
724 }
725 
726 CXType clang_Type_getClassType(CXType CT) {
727   QualType ET = QualType();
728   QualType T = GetQualType(CT);
729   const Type *TP = T.getTypePtrOrNull();
730 
731   if (TP && TP->getTypeClass() == Type::MemberPointer) {
732     ET = QualType(cast<MemberPointerType> (TP)->getClass(), 0);
733   }
734   return MakeCXType(ET, GetTU(CT));
735 }
736 
737 long long clang_Type_getSizeOf(CXType T) {
738   if (T.kind == CXType_Invalid)
739     return CXTypeLayoutError_Invalid;
740   ASTContext &Ctx = cxtu::getASTUnit(GetTU(T))->getASTContext();
741   QualType QT = GetQualType(T);
742   // [expr.sizeof] p2: if reference type, return size of referenced type
743   if (QT->isReferenceType())
744     QT = QT.getNonReferenceType();
745   // [expr.sizeof] p1: return -1 on: func, incomplete, bitfield, incomplete
746   //                   enumeration
747   // Note: We get the cxtype, not the cxcursor, so we can't call
748   //       FieldDecl->isBitField()
749   // [expr.sizeof] p3: pointer ok, function not ok.
750   // [gcc extension] lib/AST/ExprConstant.cpp:1372 HandleSizeof : vla == error
751   if (QT->isIncompleteType())
752     return CXTypeLayoutError_Incomplete;
753   if (QT->isDependentType())
754     return CXTypeLayoutError_Dependent;
755   if (!QT->isConstantSizeType())
756     return CXTypeLayoutError_NotConstantSize;
757   // [gcc extension] lib/AST/ExprConstant.cpp:1372
758   //                 HandleSizeof : {voidtype,functype} == 1
759   // not handled by ASTContext.cpp:1313 getTypeInfoImpl
760   if (QT->isVoidType() || QT->isFunctionType())
761     return 1;
762   return Ctx.getTypeSizeInChars(QT).getQuantity();
763 }
764 
765 static long long visitRecordForValidation(const RecordDecl *RD) {
766   for (const auto *I : RD->fields()){
767     QualType FQT = I->getType();
768     if (FQT->isIncompleteType())
769       return CXTypeLayoutError_Incomplete;
770     if (FQT->isDependentType())
771       return CXTypeLayoutError_Dependent;
772     // recurse
773     if (const RecordType *ChildType = I->getType()->getAs<RecordType>()) {
774       if (const RecordDecl *Child = ChildType->getDecl()) {
775         long long ret = visitRecordForValidation(Child);
776         if (ret < 0)
777           return ret;
778       }
779     }
780     // else try next field
781   }
782   return 0;
783 }
784 
785 static long long validateFieldParentType(CXCursor PC, CXType PT){
786   if (clang_isInvalid(PC.kind))
787     return CXTypeLayoutError_Invalid;
788   const RecordDecl *RD =
789         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
790   // validate parent declaration
791   if (!RD || RD->isInvalidDecl())
792     return CXTypeLayoutError_Invalid;
793   RD = RD->getDefinition();
794   if (!RD)
795     return CXTypeLayoutError_Incomplete;
796   if (RD->isInvalidDecl())
797     return CXTypeLayoutError_Invalid;
798   // validate parent type
799   QualType RT = GetQualType(PT);
800   if (RT->isIncompleteType())
801     return CXTypeLayoutError_Incomplete;
802   if (RT->isDependentType())
803     return CXTypeLayoutError_Dependent;
804   // We recurse into all record fields to detect incomplete and dependent types.
805   long long Error = visitRecordForValidation(RD);
806   if (Error < 0)
807     return Error;
808   return 0;
809 }
810 
811 long long clang_Type_getOffsetOf(CXType PT, const char *S) {
812   // check that PT is not incomplete/dependent
813   CXCursor PC = clang_getTypeDeclaration(PT);
814   long long Error = validateFieldParentType(PC,PT);
815   if (Error < 0)
816     return Error;
817   if (!S)
818     return CXTypeLayoutError_InvalidFieldName;
819   // lookup field
820   ASTContext &Ctx = cxtu::getASTUnit(GetTU(PT))->getASTContext();
821   IdentifierInfo *II = &Ctx.Idents.get(S);
822   DeclarationName FieldName(II);
823   const RecordDecl *RD =
824         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
825   // verified in validateFieldParentType
826   RD = RD->getDefinition();
827   RecordDecl::lookup_result Res = RD->lookup(FieldName);
828   // If a field of the parent record is incomplete, lookup will fail.
829   // and we would return InvalidFieldName instead of Incomplete.
830   // But this erroneous results does protects again a hidden assertion failure
831   // in the RecordLayoutBuilder
832   if (Res.size() != 1)
833     return CXTypeLayoutError_InvalidFieldName;
834   if (const FieldDecl *FD = dyn_cast<FieldDecl>(Res.front()))
835     return Ctx.getFieldOffset(FD);
836   if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(Res.front()))
837     return Ctx.getFieldOffset(IFD);
838   // we don't want any other Decl Type.
839   return CXTypeLayoutError_InvalidFieldName;
840 }
841 
842 long long clang_Cursor_getOffsetOfField(CXCursor C) {
843   if (clang_isDeclaration(C.kind)) {
844     // we need to validate the parent type
845     CXCursor PC = clang_getCursorSemanticParent(C);
846     CXType PT = clang_getCursorType(PC);
847     long long Error = validateFieldParentType(PC,PT);
848     if (Error < 0)
849       return Error;
850     // proceed with the offset calculation
851     const Decl *D = cxcursor::getCursorDecl(C);
852     ASTContext &Ctx = cxcursor::getCursorContext(C);
853     if (const FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D))
854       return Ctx.getFieldOffset(FD);
855     if (const IndirectFieldDecl *IFD = dyn_cast_or_null<IndirectFieldDecl>(D))
856       return Ctx.getFieldOffset(IFD);
857   }
858   return -1;
859 }
860 
861 enum CXRefQualifierKind clang_Type_getCXXRefQualifier(CXType T) {
862   QualType QT = GetQualType(T);
863   if (QT.isNull())
864     return CXRefQualifier_None;
865   const FunctionProtoType *FD = QT->getAs<FunctionProtoType>();
866   if (!FD)
867     return CXRefQualifier_None;
868   switch (FD->getRefQualifier()) {
869     case RQ_None:
870       return CXRefQualifier_None;
871     case RQ_LValue:
872       return CXRefQualifier_LValue;
873     case RQ_RValue:
874       return CXRefQualifier_RValue;
875   }
876   return CXRefQualifier_None;
877 }
878 
879 unsigned clang_Cursor_isBitField(CXCursor C) {
880   if (!clang_isDeclaration(C.kind))
881     return 0;
882   const FieldDecl *FD = dyn_cast_or_null<FieldDecl>(cxcursor::getCursorDecl(C));
883   if (!FD)
884     return 0;
885   return FD->isBitField();
886 }
887 
888 CXString clang_getDeclObjCTypeEncoding(CXCursor C) {
889   if (!clang_isDeclaration(C.kind))
890     return cxstring::createEmpty();
891 
892   const Decl *D = cxcursor::getCursorDecl(C);
893   ASTContext &Ctx = cxcursor::getCursorContext(C);
894   std::string encoding;
895 
896   if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))  {
897     if (Ctx.getObjCEncodingForMethodDecl(OMD, encoding))
898       return cxstring::createRef("?");
899   } else if (const ObjCPropertyDecl *OPD = dyn_cast<ObjCPropertyDecl>(D))
900     Ctx.getObjCEncodingForPropertyDecl(OPD, nullptr, encoding);
901   else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
902     Ctx.getObjCEncodingForFunctionDecl(FD, encoding);
903   else {
904     QualType Ty;
905     if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
906       Ty = Ctx.getTypeDeclType(TD);
907     if (const ValueDecl *VD = dyn_cast<ValueDecl>(D))
908       Ty = VD->getType();
909     else return cxstring::createRef("?");
910     Ctx.getObjCEncodingForType(Ty, encoding);
911   }
912 
913   return cxstring::createDup(encoding);
914 }
915 
916 int clang_Type_getNumTemplateArguments(CXType CT) {
917   QualType T = GetQualType(CT);
918   if (T.isNull())
919     return -1;
920   const CXXRecordDecl *RecordDecl = T->getAsCXXRecordDecl();
921   if (!RecordDecl)
922     return -1;
923   const ClassTemplateSpecializationDecl *TemplateDecl =
924       dyn_cast<ClassTemplateSpecializationDecl>(RecordDecl);
925   if (!TemplateDecl)
926     return -1;
927   return TemplateDecl->getTemplateArgs().size();
928 }
929 
930 CXType clang_Type_getTemplateArgumentAsType(CXType CT, unsigned i) {
931   QualType T = GetQualType(CT);
932   if (T.isNull())
933     return MakeCXType(QualType(), GetTU(CT));
934   const CXXRecordDecl *RecordDecl = T->getAsCXXRecordDecl();
935   if (!RecordDecl)
936     return MakeCXType(QualType(), GetTU(CT));
937   const ClassTemplateSpecializationDecl *TemplateDecl =
938       dyn_cast<ClassTemplateSpecializationDecl>(RecordDecl);
939   if (!TemplateDecl)
940     return MakeCXType(QualType(), GetTU(CT));
941   const TemplateArgumentList &TA = TemplateDecl->getTemplateArgs();
942   if (TA.size() <= i)
943     return MakeCXType(QualType(), GetTU(CT));
944   const TemplateArgument &A = TA.get(i);
945   if (A.getKind() != TemplateArgument::Type)
946     return MakeCXType(QualType(), GetTU(CT));
947   return MakeCXType(A.getAsType(), GetTU(CT));
948 }
949 
950 unsigned clang_Type_visitFields(CXType PT,
951                                 CXFieldVisitor visitor,
952                                 CXClientData client_data){
953   CXCursor PC = clang_getTypeDeclaration(PT);
954   if (clang_isInvalid(PC.kind))
955     return false;
956   const RecordDecl *RD =
957         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
958   if (!RD || RD->isInvalidDecl())
959     return false;
960   RD = RD->getDefinition();
961   if (!RD || RD->isInvalidDecl())
962     return false;
963 
964   for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
965        I != E; ++I){
966     const FieldDecl *FD = dyn_cast_or_null<FieldDecl>((*I));
967     // Callback to the client.
968     switch (visitor(cxcursor::MakeCXCursor(FD, GetTU(PT)), client_data)){
969     case CXVisit_Break:
970       return true;
971     case CXVisit_Continue:
972       break;
973     }
974   }
975   return true;
976 }
977 
978 unsigned clang_Cursor_isAnonymous(CXCursor C){
979   if (!clang_isDeclaration(C.kind))
980     return 0;
981   const Decl *D = cxcursor::getCursorDecl(C);
982   if (const RecordDecl *FD = dyn_cast_or_null<RecordDecl>(D))
983     return FD->isAnonymousStructOrUnion();
984   return 0;
985 }
986 
987 } // end: extern "C"
988