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 
GetBuiltinTypeKind(const BuiltinType * BT)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 
GetTypeKind(QualType T)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 
MakeCXType(QualType T,CXTranslationUnit TU)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 
GetQualType(CXType CT)136 static inline QualType GetQualType(CXType CT) {
137   return QualType::getFromOpaquePtr(CT.data[0]);
138 }
139 
GetTU(CXType CT)140 static inline CXTranslationUnit GetTU(CXType CT) {
141   return static_cast<CXTranslationUnit>(CT.data[1]);
142 }
143 
144 extern "C" {
145 
clang_getCursorType(CXCursor C)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 
clang_getTypeSpelling(CXType CT)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 
clang_getTypedefDeclUnderlyingType(CXCursor C)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 
clang_getEnumDeclIntegerType(CXCursor C)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 
clang_getEnumConstantDeclValue(CXCursor C)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 
clang_getEnumConstantDeclUnsignedValue(CXCursor C)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 
clang_getFieldDeclBitWidth(CXCursor C)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 
clang_getCanonicalType(CXType CT)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 
clang_isConstQualifiedType(CXType CT)334 unsigned clang_isConstQualifiedType(CXType CT) {
335   QualType T = GetQualType(CT);
336   return T.isLocalConstQualified();
337 }
338 
clang_isVolatileQualifiedType(CXType CT)339 unsigned clang_isVolatileQualifiedType(CXType CT) {
340   QualType T = GetQualType(CT);
341   return T.isLocalVolatileQualified();
342 }
343 
clang_isRestrictQualifiedType(CXType CT)344 unsigned clang_isRestrictQualifiedType(CXType CT) {
345   QualType T = GetQualType(CT);
346   return T.isLocalRestrictQualified();
347 }
348 
clang_getPointeeType(CXType CT)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 
clang_getTypeDeclaration(CXType CT)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::InjectedClassName:
416     D = cast<InjectedClassNameType>(TP)->getDecl();
417     break;
418 
419   // FIXME: Template type parameters!
420 
421   case Type::Elaborated:
422     TP = cast<ElaboratedType>(TP)->getNamedType().getTypePtrOrNull();
423     goto try_again;
424 
425   default:
426     break;
427   }
428 
429   if (!D)
430     return cxcursor::MakeCXCursorInvalid(CXCursor_NoDeclFound);
431 
432   return cxcursor::MakeCXCursor(D, GetTU(CT));
433 }
434 
clang_getTypeKindSpelling(enum CXTypeKind K)435 CXString clang_getTypeKindSpelling(enum CXTypeKind K) {
436   const char *s = nullptr;
437 #define TKIND(X) case CXType_##X: s = ""  #X  ""; break
438   switch (K) {
439     TKIND(Invalid);
440     TKIND(Unexposed);
441     TKIND(Void);
442     TKIND(Bool);
443     TKIND(Char_U);
444     TKIND(UChar);
445     TKIND(Char16);
446     TKIND(Char32);
447     TKIND(UShort);
448     TKIND(UInt);
449     TKIND(ULong);
450     TKIND(ULongLong);
451     TKIND(UInt128);
452     TKIND(Char_S);
453     TKIND(SChar);
454     case CXType_WChar: s = "WChar"; break;
455     TKIND(Short);
456     TKIND(Int);
457     TKIND(Long);
458     TKIND(LongLong);
459     TKIND(Int128);
460     TKIND(Float);
461     TKIND(Double);
462     TKIND(LongDouble);
463     TKIND(NullPtr);
464     TKIND(Overload);
465     TKIND(Dependent);
466     TKIND(ObjCId);
467     TKIND(ObjCClass);
468     TKIND(ObjCSel);
469     TKIND(Complex);
470     TKIND(Pointer);
471     TKIND(BlockPointer);
472     TKIND(LValueReference);
473     TKIND(RValueReference);
474     TKIND(Record);
475     TKIND(Enum);
476     TKIND(Typedef);
477     TKIND(ObjCInterface);
478     TKIND(ObjCObjectPointer);
479     TKIND(FunctionNoProto);
480     TKIND(FunctionProto);
481     TKIND(ConstantArray);
482     TKIND(IncompleteArray);
483     TKIND(VariableArray);
484     TKIND(DependentSizedArray);
485     TKIND(Vector);
486     TKIND(MemberPointer);
487     TKIND(Auto);
488   }
489 #undef TKIND
490   return cxstring::createRef(s);
491 }
492 
clang_equalTypes(CXType A,CXType B)493 unsigned clang_equalTypes(CXType A, CXType B) {
494   return A.data[0] == B.data[0] && A.data[1] == B.data[1];
495 }
496 
clang_isFunctionTypeVariadic(CXType X)497 unsigned clang_isFunctionTypeVariadic(CXType X) {
498   QualType T = GetQualType(X);
499   if (T.isNull())
500     return 0;
501 
502   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>())
503     return (unsigned)FD->isVariadic();
504 
505   if (T->getAs<FunctionNoProtoType>())
506     return 1;
507 
508   return 0;
509 }
510 
clang_getFunctionTypeCallingConv(CXType X)511 CXCallingConv clang_getFunctionTypeCallingConv(CXType X) {
512   QualType T = GetQualType(X);
513   if (T.isNull())
514     return CXCallingConv_Invalid;
515 
516   if (const FunctionType *FD = T->getAs<FunctionType>()) {
517 #define TCALLINGCONV(X) case CC_##X: return CXCallingConv_##X
518     switch (FD->getCallConv()) {
519       TCALLINGCONV(C);
520       TCALLINGCONV(X86StdCall);
521       TCALLINGCONV(X86FastCall);
522       TCALLINGCONV(X86ThisCall);
523       TCALLINGCONV(X86Pascal);
524       TCALLINGCONV(X86VectorCall);
525       TCALLINGCONV(X86_64Win64);
526       TCALLINGCONV(X86_64SysV);
527       TCALLINGCONV(AAPCS);
528       TCALLINGCONV(AAPCS_VFP);
529       TCALLINGCONV(IntelOclBicc);
530     case CC_SpirFunction: return CXCallingConv_Unexposed;
531     case CC_SpirKernel: return CXCallingConv_Unexposed;
532       break;
533     }
534 #undef TCALLINGCONV
535   }
536 
537   return CXCallingConv_Invalid;
538 }
539 
clang_getNumArgTypes(CXType X)540 int clang_getNumArgTypes(CXType X) {
541   QualType T = GetQualType(X);
542   if (T.isNull())
543     return -1;
544 
545   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>()) {
546     return FD->getNumParams();
547   }
548 
549   if (T->getAs<FunctionNoProtoType>()) {
550     return 0;
551   }
552 
553   return -1;
554 }
555 
clang_getArgType(CXType X,unsigned i)556 CXType clang_getArgType(CXType X, unsigned i) {
557   QualType T = GetQualType(X);
558   if (T.isNull())
559     return MakeCXType(QualType(), GetTU(X));
560 
561   if (const FunctionProtoType *FD = T->getAs<FunctionProtoType>()) {
562     unsigned numParams = FD->getNumParams();
563     if (i >= numParams)
564       return MakeCXType(QualType(), GetTU(X));
565 
566     return MakeCXType(FD->getParamType(i), GetTU(X));
567   }
568 
569   return MakeCXType(QualType(), GetTU(X));
570 }
571 
clang_getResultType(CXType X)572 CXType clang_getResultType(CXType X) {
573   QualType T = GetQualType(X);
574   if (T.isNull())
575     return MakeCXType(QualType(), GetTU(X));
576 
577   if (const FunctionType *FD = T->getAs<FunctionType>())
578     return MakeCXType(FD->getReturnType(), GetTU(X));
579 
580   return MakeCXType(QualType(), GetTU(X));
581 }
582 
clang_getCursorResultType(CXCursor C)583 CXType clang_getCursorResultType(CXCursor C) {
584   if (clang_isDeclaration(C.kind)) {
585     const Decl *D = cxcursor::getCursorDecl(C);
586     if (const ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(D))
587       return MakeCXType(MD->getReturnType(), cxcursor::getCursorTU(C));
588 
589     return clang_getResultType(clang_getCursorType(C));
590   }
591 
592   return MakeCXType(QualType(), cxcursor::getCursorTU(C));
593 }
594 
clang_isPODType(CXType X)595 unsigned clang_isPODType(CXType X) {
596   QualType T = GetQualType(X);
597   if (T.isNull())
598     return 0;
599 
600   CXTranslationUnit TU = GetTU(X);
601 
602   return T.isPODType(cxtu::getASTUnit(TU)->getASTContext()) ? 1 : 0;
603 }
604 
clang_getElementType(CXType CT)605 CXType clang_getElementType(CXType CT) {
606   QualType ET = QualType();
607   QualType T = GetQualType(CT);
608   const Type *TP = T.getTypePtrOrNull();
609 
610   if (TP) {
611     switch (TP->getTypeClass()) {
612     case Type::ConstantArray:
613       ET = cast<ConstantArrayType> (TP)->getElementType();
614       break;
615     case Type::IncompleteArray:
616       ET = cast<IncompleteArrayType> (TP)->getElementType();
617       break;
618     case Type::VariableArray:
619       ET = cast<VariableArrayType> (TP)->getElementType();
620       break;
621     case Type::DependentSizedArray:
622       ET = cast<DependentSizedArrayType> (TP)->getElementType();
623       break;
624     case Type::Vector:
625       ET = cast<VectorType> (TP)->getElementType();
626       break;
627     case Type::Complex:
628       ET = cast<ComplexType> (TP)->getElementType();
629       break;
630     default:
631       break;
632     }
633   }
634   return MakeCXType(ET, GetTU(CT));
635 }
636 
clang_getNumElements(CXType CT)637 long long clang_getNumElements(CXType CT) {
638   long long result = -1;
639   QualType T = GetQualType(CT);
640   const Type *TP = T.getTypePtrOrNull();
641 
642   if (TP) {
643     switch (TP->getTypeClass()) {
644     case Type::ConstantArray:
645       result = cast<ConstantArrayType> (TP)->getSize().getSExtValue();
646       break;
647     case Type::Vector:
648       result = cast<VectorType> (TP)->getNumElements();
649       break;
650     default:
651       break;
652     }
653   }
654   return result;
655 }
656 
clang_getArrayElementType(CXType CT)657 CXType clang_getArrayElementType(CXType CT) {
658   QualType ET = QualType();
659   QualType T = GetQualType(CT);
660   const Type *TP = T.getTypePtrOrNull();
661 
662   if (TP) {
663     switch (TP->getTypeClass()) {
664     case Type::ConstantArray:
665       ET = cast<ConstantArrayType> (TP)->getElementType();
666       break;
667     case Type::IncompleteArray:
668       ET = cast<IncompleteArrayType> (TP)->getElementType();
669       break;
670     case Type::VariableArray:
671       ET = cast<VariableArrayType> (TP)->getElementType();
672       break;
673     case Type::DependentSizedArray:
674       ET = cast<DependentSizedArrayType> (TP)->getElementType();
675       break;
676     default:
677       break;
678     }
679   }
680   return MakeCXType(ET, GetTU(CT));
681 }
682 
clang_getArraySize(CXType CT)683 long long clang_getArraySize(CXType CT) {
684   long long result = -1;
685   QualType T = GetQualType(CT);
686   const Type *TP = T.getTypePtrOrNull();
687 
688   if (TP) {
689     switch (TP->getTypeClass()) {
690     case Type::ConstantArray:
691       result = cast<ConstantArrayType> (TP)->getSize().getSExtValue();
692       break;
693     default:
694       break;
695     }
696   }
697   return result;
698 }
699 
clang_Type_getAlignOf(CXType T)700 long long clang_Type_getAlignOf(CXType T) {
701   if (T.kind == CXType_Invalid)
702     return CXTypeLayoutError_Invalid;
703   ASTContext &Ctx = cxtu::getASTUnit(GetTU(T))->getASTContext();
704   QualType QT = GetQualType(T);
705   // [expr.alignof] p1: return size_t value for complete object type, reference
706   //                    or array.
707   // [expr.alignof] p3: if reference type, return size of referenced type
708   if (QT->isReferenceType())
709     QT = QT.getNonReferenceType();
710   if (QT->isIncompleteType())
711     return CXTypeLayoutError_Incomplete;
712   if (QT->isDependentType())
713     return CXTypeLayoutError_Dependent;
714   // Exceptions by GCC extension - see ASTContext.cpp:1313 getTypeInfoImpl
715   // if (QT->isFunctionType()) return 4; // Bug #15511 - should be 1
716   // if (QT->isVoidType()) return 1;
717   return Ctx.getTypeAlignInChars(QT).getQuantity();
718 }
719 
clang_Type_getClassType(CXType CT)720 CXType clang_Type_getClassType(CXType CT) {
721   QualType ET = QualType();
722   QualType T = GetQualType(CT);
723   const Type *TP = T.getTypePtrOrNull();
724 
725   if (TP && TP->getTypeClass() == Type::MemberPointer) {
726     ET = QualType(cast<MemberPointerType> (TP)->getClass(), 0);
727   }
728   return MakeCXType(ET, GetTU(CT));
729 }
730 
clang_Type_getSizeOf(CXType T)731 long long clang_Type_getSizeOf(CXType T) {
732   if (T.kind == CXType_Invalid)
733     return CXTypeLayoutError_Invalid;
734   ASTContext &Ctx = cxtu::getASTUnit(GetTU(T))->getASTContext();
735   QualType QT = GetQualType(T);
736   // [expr.sizeof] p2: if reference type, return size of referenced type
737   if (QT->isReferenceType())
738     QT = QT.getNonReferenceType();
739   // [expr.sizeof] p1: return -1 on: func, incomplete, bitfield, incomplete
740   //                   enumeration
741   // Note: We get the cxtype, not the cxcursor, so we can't call
742   //       FieldDecl->isBitField()
743   // [expr.sizeof] p3: pointer ok, function not ok.
744   // [gcc extension] lib/AST/ExprConstant.cpp:1372 HandleSizeof : vla == error
745   if (QT->isIncompleteType())
746     return CXTypeLayoutError_Incomplete;
747   if (QT->isDependentType())
748     return CXTypeLayoutError_Dependent;
749   if (!QT->isConstantSizeType())
750     return CXTypeLayoutError_NotConstantSize;
751   // [gcc extension] lib/AST/ExprConstant.cpp:1372
752   //                 HandleSizeof : {voidtype,functype} == 1
753   // not handled by ASTContext.cpp:1313 getTypeInfoImpl
754   if (QT->isVoidType() || QT->isFunctionType())
755     return 1;
756   return Ctx.getTypeSizeInChars(QT).getQuantity();
757 }
758 
visitRecordForValidation(const RecordDecl * RD)759 static long long visitRecordForValidation(const RecordDecl *RD) {
760   for (const auto *I : RD->fields()){
761     QualType FQT = I->getType();
762     if (FQT->isIncompleteType())
763       return CXTypeLayoutError_Incomplete;
764     if (FQT->isDependentType())
765       return CXTypeLayoutError_Dependent;
766     // recurse
767     if (const RecordType *ChildType = I->getType()->getAs<RecordType>()) {
768       if (const RecordDecl *Child = ChildType->getDecl()) {
769         long long ret = visitRecordForValidation(Child);
770         if (ret < 0)
771           return ret;
772       }
773     }
774     // else try next field
775   }
776   return 0;
777 }
778 
validateFieldParentType(CXCursor PC,CXType PT)779 static long long validateFieldParentType(CXCursor PC, CXType PT){
780   if (clang_isInvalid(PC.kind))
781     return CXTypeLayoutError_Invalid;
782   const RecordDecl *RD =
783         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
784   // validate parent declaration
785   if (!RD || RD->isInvalidDecl())
786     return CXTypeLayoutError_Invalid;
787   RD = RD->getDefinition();
788   if (!RD)
789     return CXTypeLayoutError_Incomplete;
790   if (RD->isInvalidDecl())
791     return CXTypeLayoutError_Invalid;
792   // validate parent type
793   QualType RT = GetQualType(PT);
794   if (RT->isIncompleteType())
795     return CXTypeLayoutError_Incomplete;
796   if (RT->isDependentType())
797     return CXTypeLayoutError_Dependent;
798   // We recurse into all record fields to detect incomplete and dependent types.
799   long long Error = visitRecordForValidation(RD);
800   if (Error < 0)
801     return Error;
802   return 0;
803 }
804 
clang_Type_getOffsetOf(CXType PT,const char * S)805 long long clang_Type_getOffsetOf(CXType PT, const char *S) {
806   // check that PT is not incomplete/dependent
807   CXCursor PC = clang_getTypeDeclaration(PT);
808   long long Error = validateFieldParentType(PC,PT);
809   if (Error < 0)
810     return Error;
811   if (!S)
812     return CXTypeLayoutError_InvalidFieldName;
813   // lookup field
814   ASTContext &Ctx = cxtu::getASTUnit(GetTU(PT))->getASTContext();
815   IdentifierInfo *II = &Ctx.Idents.get(S);
816   DeclarationName FieldName(II);
817   const RecordDecl *RD =
818         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
819   // verified in validateFieldParentType
820   RD = RD->getDefinition();
821   RecordDecl::lookup_result Res = RD->lookup(FieldName);
822   // If a field of the parent record is incomplete, lookup will fail.
823   // and we would return InvalidFieldName instead of Incomplete.
824   // But this erroneous results does protects again a hidden assertion failure
825   // in the RecordLayoutBuilder
826   if (Res.size() != 1)
827     return CXTypeLayoutError_InvalidFieldName;
828   if (const FieldDecl *FD = dyn_cast<FieldDecl>(Res.front()))
829     return Ctx.getFieldOffset(FD);
830   if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(Res.front()))
831     return Ctx.getFieldOffset(IFD);
832   // we don't want any other Decl Type.
833   return CXTypeLayoutError_InvalidFieldName;
834 }
835 
clang_Cursor_getOffsetOfField(CXCursor C)836 long long clang_Cursor_getOffsetOfField(CXCursor C) {
837   if (clang_isDeclaration(C.kind)) {
838     // we need to validate the parent type
839     CXCursor PC = clang_getCursorSemanticParent(C);
840     CXType PT = clang_getCursorType(PC);
841     long long Error = validateFieldParentType(PC,PT);
842     if (Error < 0)
843       return Error;
844     // proceed with the offset calculation
845     const Decl *D = cxcursor::getCursorDecl(C);
846     ASTContext &Ctx = cxcursor::getCursorContext(C);
847     if (const FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D))
848       return Ctx.getFieldOffset(FD);
849     if (const IndirectFieldDecl *IFD = dyn_cast_or_null<IndirectFieldDecl>(D))
850       return Ctx.getFieldOffset(IFD);
851   }
852   return -1;
853 }
854 
clang_Type_getCXXRefQualifier(CXType T)855 enum CXRefQualifierKind clang_Type_getCXXRefQualifier(CXType T) {
856   QualType QT = GetQualType(T);
857   if (QT.isNull())
858     return CXRefQualifier_None;
859   const FunctionProtoType *FD = QT->getAs<FunctionProtoType>();
860   if (!FD)
861     return CXRefQualifier_None;
862   switch (FD->getRefQualifier()) {
863     case RQ_None:
864       return CXRefQualifier_None;
865     case RQ_LValue:
866       return CXRefQualifier_LValue;
867     case RQ_RValue:
868       return CXRefQualifier_RValue;
869   }
870   return CXRefQualifier_None;
871 }
872 
clang_Cursor_isBitField(CXCursor C)873 unsigned clang_Cursor_isBitField(CXCursor C) {
874   if (!clang_isDeclaration(C.kind))
875     return 0;
876   const FieldDecl *FD = dyn_cast_or_null<FieldDecl>(cxcursor::getCursorDecl(C));
877   if (!FD)
878     return 0;
879   return FD->isBitField();
880 }
881 
clang_getDeclObjCTypeEncoding(CXCursor C)882 CXString clang_getDeclObjCTypeEncoding(CXCursor C) {
883   if (!clang_isDeclaration(C.kind))
884     return cxstring::createEmpty();
885 
886   const Decl *D = cxcursor::getCursorDecl(C);
887   ASTContext &Ctx = cxcursor::getCursorContext(C);
888   std::string encoding;
889 
890   if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))  {
891     if (Ctx.getObjCEncodingForMethodDecl(OMD, encoding))
892       return cxstring::createRef("?");
893   } else if (const ObjCPropertyDecl *OPD = dyn_cast<ObjCPropertyDecl>(D))
894     Ctx.getObjCEncodingForPropertyDecl(OPD, nullptr, encoding);
895   else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
896     Ctx.getObjCEncodingForFunctionDecl(FD, encoding);
897   else {
898     QualType Ty;
899     if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
900       Ty = Ctx.getTypeDeclType(TD);
901     if (const ValueDecl *VD = dyn_cast<ValueDecl>(D))
902       Ty = VD->getType();
903     else return cxstring::createRef("?");
904     Ctx.getObjCEncodingForType(Ty, encoding);
905   }
906 
907   return cxstring::createDup(encoding);
908 }
909 
clang_Type_getNumTemplateArguments(CXType CT)910 int clang_Type_getNumTemplateArguments(CXType CT) {
911   QualType T = GetQualType(CT);
912   if (T.isNull())
913     return -1;
914   const CXXRecordDecl *RecordDecl = T->getAsCXXRecordDecl();
915   if (!RecordDecl)
916     return -1;
917   const ClassTemplateSpecializationDecl *TemplateDecl =
918       dyn_cast<ClassTemplateSpecializationDecl>(RecordDecl);
919   if (!TemplateDecl)
920     return -1;
921   return TemplateDecl->getTemplateArgs().size();
922 }
923 
clang_Type_getTemplateArgumentAsType(CXType CT,unsigned i)924 CXType clang_Type_getTemplateArgumentAsType(CXType CT, unsigned i) {
925   QualType T = GetQualType(CT);
926   if (T.isNull())
927     return MakeCXType(QualType(), GetTU(CT));
928   const CXXRecordDecl *RecordDecl = T->getAsCXXRecordDecl();
929   if (!RecordDecl)
930     return MakeCXType(QualType(), GetTU(CT));
931   const ClassTemplateSpecializationDecl *TemplateDecl =
932       dyn_cast<ClassTemplateSpecializationDecl>(RecordDecl);
933   if (!TemplateDecl)
934     return MakeCXType(QualType(), GetTU(CT));
935   const TemplateArgumentList &TA = TemplateDecl->getTemplateArgs();
936   if (TA.size() <= i)
937     return MakeCXType(QualType(), GetTU(CT));
938   const TemplateArgument &A = TA.get(i);
939   if (A.getKind() != TemplateArgument::Type)
940     return MakeCXType(QualType(), GetTU(CT));
941   return MakeCXType(A.getAsType(), GetTU(CT));
942 }
943 
clang_Type_visitFields(CXType PT,CXFieldVisitor visitor,CXClientData client_data)944 unsigned clang_Type_visitFields(CXType PT,
945                                 CXFieldVisitor visitor,
946                                 CXClientData client_data){
947   CXCursor PC = clang_getTypeDeclaration(PT);
948   if (clang_isInvalid(PC.kind))
949     return false;
950   const RecordDecl *RD =
951         dyn_cast_or_null<RecordDecl>(cxcursor::getCursorDecl(PC));
952   if (!RD || RD->isInvalidDecl())
953     return false;
954   RD = RD->getDefinition();
955   if (!RD || RD->isInvalidDecl())
956     return false;
957 
958   for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
959        I != E; ++I){
960     const FieldDecl *FD = dyn_cast_or_null<FieldDecl>((*I));
961     // Callback to the client.
962     switch (visitor(cxcursor::MakeCXCursor(FD, GetTU(PT)), client_data)){
963     case CXVisit_Break:
964       return true;
965     case CXVisit_Continue:
966       break;
967     }
968   }
969   return true;
970 }
971 
clang_Cursor_isAnonymous(CXCursor C)972 unsigned clang_Cursor_isAnonymous(CXCursor C){
973   if (!clang_isDeclaration(C.kind))
974     return 0;
975   const Decl *D = cxcursor::getCursorDecl(C);
976   if (const RecordDecl *FD = dyn_cast_or_null<RecordDecl>(D))
977     return FD->isAnonymousStructOrUnion();
978   return 0;
979 }
980 
981 } // end: extern "C"
982